Fix all merge conflicts

There was a lot of conflicts and to solve, I refresh manually the source folders.

564 files changed, 20724 insertions, 14186 deletions

diff --git a/source/blender/editors/animation/CMakeLists.txt b/source/blender/editors/animation/CMakeLists.txt
index 6adfab6e921..a72b2874f95 100644
--- a/source/blender/editors/animation/CMakeLists.txt
+++ b/source/blender/editors/animation/CMakeLists.txt
@@ -12,7 +12,6 @@ set(INC
   ../../sequencer
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/animation/anim_channels_defines.c b/source/blender/editors/animation/anim_channels_defines.c
index 729e8533d50..8edeea49cbb 100644
--- a/source/blender/editors/animation/anim_channels_defines.c
+++ b/source/blender/editors/animation/anim_channels_defines.c
@@ -43,6 +43,7 @@
 #include "DNA_world_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "BKE_anim_data.h"
@@ -156,7 +157,7 @@ static void acf_generic_dataexpand_backdrop(bAnimContext *ac,
   /* set backdrop drawing color */
   acf->get_backdrop_color(ac, ale, color);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3fv(color);
 
   /* no rounded corner - just rectangular box */
@@ -245,7 +246,7 @@ static void acf_generic_channel_backdrop(bAnimContext *ac,
   /* set backdrop drawing color */
   acf->get_backdrop_color(ac, ale, color);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3fv(color);
 
   /* no rounded corners - just rectangular box */
@@ -4448,7 +4449,7 @@ void ANIM_channel_draw(
         uint pos = GPU_vertformat_attr_add(
             immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
         /* F-Curve channels need to have a special 'color code' box drawn,
          * which is colored with whatever color the curve has stored.
@@ -4512,7 +4513,7 @@ void ANIM_channel_draw(
       uint pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       /* FIXME: replace hardcoded color here, and check on extents! */
       immUniformColor3f(1.0f, 0.0f, 0.0f);
@@ -4548,7 +4549,7 @@ void ANIM_channel_draw(
     float color[3];
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* get and set backdrop color */
     acf->get_backdrop_color(ac, ale, color);
@@ -5352,8 +5353,8 @@ void ANIM_channel_draw_widgets(const bContext *C,
      *   and wouldn't be able to auto-keyframe.
      * - Slider should start before the toggles (if they're visible)
      *   to keep a clean line down the side.
-     * - Sliders are always drawn in Shapekey mode now. Prior to this
-     *   the SACTION_SLIDERS flag would be set when changing into Shapekey mode.
+     * - Sliders are always drawn in Shape-key mode now. Prior to this
+     *   the SACTION_SLIDERS flag would be set when changing into shape-key mode.
      */
     if (((draw_sliders) && ELEM(ale->type,
                                 ANIMTYPE_FCURVE,
diff --git a/source/blender/editors/animation/anim_channels_edit.c b/source/blender/editors/animation/anim_channels_edit.c
index 8464f280c29..ea631da27af 100644
--- a/source/blender/editors/animation/anim_channels_edit.c
+++ b/source/blender/editors/animation/anim_channels_edit.c
@@ -31,6 +31,7 @@
 #include "BKE_fcurve.h"
 #include "BKE_global.h"
 #include "BKE_gpencil.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_mask.h"
 #include "BKE_nla.h"
@@ -1498,7 +1499,8 @@ static int animchannels_rearrange_exec(bContext *C, wmOperator *op)
     int filter;
 
     /* get animdata blocks */
-    filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_ANIMDATA);
+    filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_ANIMDATA |
+              ANIMFILTER_FCURVESONLY);
     ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
     for (ale = anim_data.first; ale; ale = ale->next) {
@@ -1639,7 +1641,8 @@ static void animchannels_group_channels(bAnimContext *ac,
     int filter;
 
     /* find selected F-Curves to re-group */
-    filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_SEL);
+    filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_SEL |
+              ANIMFILTER_FCURVESONLY);
     ANIM_animdata_filter(ac, &anim_data, filter, adt_ref, ANIMCONT_CHANNEL);
 
     if (anim_data.first) {
@@ -1693,7 +1696,7 @@ static int animchannels_group_exec(bContext *C, wmOperator *op)
 
     /* Handle each animdata block separately, so that the regrouping doesn't flow into blocks. */
     filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_ANIMDATA |
-              ANIMFILTER_NODUPLIS);
+              ANIMFILTER_NODUPLIS | ANIMFILTER_FCURVESONLY);
     ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
     for (ale = anim_data.first; ale; ale = ale->next) {
@@ -1753,7 +1756,7 @@ static int animchannels_ungroup_exec(bContext *C, wmOperator *UNUSED(op))
 
   /* just selected F-Curves... */
   filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_SEL |
-            ANIMFILTER_NODUPLIS);
+            ANIMFILTER_NODUPLIS | ANIMFILTER_FCURVESONLY);
   ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
   for (ale = anim_data.first; ale; ale = ale->next) {
@@ -2453,7 +2456,7 @@ static int animchannels_enable_exec(bContext *C, wmOperator *UNUSED(op))
   }
 
   /* filter data */
-  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_NODUPLIS);
+  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_NODUPLIS | ANIMFILTER_FCURVESONLY);
   ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
   /* loop through filtered data and clean curves */
@@ -2951,6 +2954,7 @@ static int click_select_channel_object(bContext *C,
                                        bAnimListElem *ale,
                                        const short /* eEditKeyframes_Select or -1 */ selectmode)
 {
+  Scene *scene = ac->scene;
   ViewLayer *view_layer = ac->view_layer;
   Base *base = (Base *)ale->data;
   Object *ob = base->object;
@@ -2969,11 +2973,10 @@ static int click_select_channel_object(bContext *C,
     }
   }
   else {
-    Base *b;
-
     /* deselect all */
+    BKE_view_layer_synced_ensure(scene, view_layer);
     /* TODO: should this deselect all other types of channels too? */
-    for (b = view_layer->object_bases.first; b; b = b->next) {
+    LISTBASE_FOREACH (Base *, b, BKE_view_layer_object_bases_get(view_layer)) {
       ED_object_base_select(b, BA_DESELECT);
       if (b->object->adt) {
         b->object->adt->flag &= ~(ADT_UI_SELECTED | ADT_UI_ACTIVE);
@@ -3258,10 +3261,14 @@ static int mouse_anim_channels(bContext *C,
   bAnimListElem *ale;
   int filter;
   int notifierFlags = 0;
+  ScrArea *area = CTX_wm_area(C);
 
   /* get the channel that was clicked on */
   /* filter channels */
   filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
+  if (ELEM(area->spacetype, SPACE_NLA, SPACE_GRAPH)) {
+    filter |= ANIMFILTER_FCURVESONLY;
+  }
   ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 
   /* get channel from index */
@@ -3453,7 +3460,8 @@ static bool select_anim_channel_keys(bAnimContext *ac, int channel_index, bool e
 
   /* get the channel that was clicked on */
   /* filter channels */
-  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
+  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS |
+            ANIMFILTER_FCURVESONLY);
   ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 
   /* get channel from index */
diff --git a/source/blender/editors/animation/anim_deps.c b/source/blender/editors/animation/anim_deps.c
index d80eac2422e..22c14983569 100644
--- a/source/blender/editors/animation/anim_deps.c
+++ b/source/blender/editors/animation/anim_deps.c
@@ -32,6 +32,7 @@
 #include "DEG_depsgraph.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "SEQ_sequencer.h"
 #include "SEQ_utils.h"
@@ -356,7 +357,7 @@ void ANIM_animdata_update(bAnimContext *ac, ListBase *anim_data)
       if (ale->update & ANIM_UPDATE_HANDLES) {
         ale->update &= ~ANIM_UPDATE_HANDLES;
         if (fcu) {
-          calchandles_fcurve(fcu);
+          BKE_fcurve_handles_recalc(fcu);
         }
       }
 
diff --git a/source/blender/editors/animation/anim_draw.c b/source/blender/editors/animation/anim_draw.c
index d9dcbf1d57e..06a0077df9b 100644
--- a/source/blender/editors/animation/anim_draw.c
+++ b/source/blender/editors/animation/anim_draw.c
@@ -35,6 +35,7 @@
 #include "ED_keyframes_keylist.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "UI_interface.h"
 #include "UI_resources.h"
@@ -59,7 +60,7 @@ void ANIM_draw_cfra(const bContext *C, View2D *v2d, short flag)
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw a light green line to indicate current frame */
   immUniformThemeColor(TH_CFRAME);
@@ -86,7 +87,7 @@ void ANIM_draw_previewrange(const bContext *C, View2D *v2d, int end_frame_width)
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColorShadeAlpha(TH_ANIM_PREVIEW_RANGE, -25, -30);
     /* XXX: Fix this hardcoded color (anim_active) */
     // immUniformColor4f(0.8f, 0.44f, 0.1f, 0.2f);
@@ -117,7 +118,7 @@ void ANIM_draw_framerange(Scene *scene, View2D *v2d)
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColorShadeAlpha(TH_BACK, -25, -100);
 
   if (scene->r.sfra < scene->r.efra) {
@@ -192,7 +193,7 @@ void ANIM_draw_action_framerange(
   GPU_blend(GPU_BLEND_NONE);
 
   /* Thin lines where the actual frames are. */
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColorShade(TH_BACK, -60);
 
   GPU_line_width(1.0f);
diff --git a/source/blender/editors/animation/anim_filter.c b/source/blender/editors/animation/anim_filter.c
index e20932fa53e..5b4d436b0e0 100644
--- a/source/blender/editors/animation/anim_filter.c
+++ b/source/blender/editors/animation/anim_filter.c
@@ -118,11 +118,13 @@ static void animedit_get_yscale_factor(bAnimContext *ac)
 /* NOTE: there's a similar function in key.c #BKE_key_from_object. */
 static Key *actedit_get_shapekeys(bAnimContext *ac)
 {
+  Scene *scene = ac->scene;
   ViewLayer *view_layer = ac->view_layer;
   Object *ob;
   Key *key;
 
-  ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ob = BKE_view_layer_active_object_get(view_layer);
   if (ob == NULL) {
     return NULL;
   }
@@ -393,12 +395,13 @@ bool ANIM_animdata_get_context(const bContext *C, bAnimContext *ac)
   /* get useful default context settings from context */
   ac->bmain = bmain;
   ac->scene = scene;
+  ac->view_layer = CTX_data_view_layer(C);
   if (scene) {
     ac->markers = ED_context_get_markers(C);
+    BKE_view_layer_synced_ensure(ac->scene, ac->view_layer);
   }
-  ac->view_layer = CTX_data_view_layer(C);
   ac->depsgraph = CTX_data_depsgraph_pointer(C);
-  ac->obact = (ac->view_layer->basact) ? ac->view_layer->basact->object : NULL;
+  ac->obact = BKE_view_layer_active_object_get(ac->view_layer);
   ac->area = area;
   ac->region = region;
   ac->sl = sl;
@@ -1807,11 +1810,13 @@ static size_t animdata_filter_gpencil_data(ListBase *anim_data,
     ListBase tmp_data = {NULL, NULL};
     size_t tmp_items = 0;
 
-    /* add gpencil animation channels */
-    BEGIN_ANIMFILTER_SUBCHANNELS (EXPANDED_GPD(gpd)) {
-      tmp_items += animdata_filter_gpencil_layers_data(&tmp_data, ads, gpd, filter_mode);
+    if (!(filter_mode & ANIMFILTER_FCURVESONLY)) {
+      /* add gpencil animation channels */
+      BEGIN_ANIMFILTER_SUBCHANNELS (EXPANDED_GPD(gpd)) {
+        tmp_items += animdata_filter_gpencil_layers_data(&tmp_data, ads, gpd, filter_mode);
+      }
+      END_ANIMFILTER_SUBCHANNELS;
     }
-    END_ANIMFILTER_SUBCHANNELS;
 
     /* did we find anything? */
     if (tmp_items) {
@@ -1844,8 +1849,8 @@ static size_t animdata_filter_gpencil(bAnimContext *ac,
   bDopeSheet *ads = ac->ads;
   size_t items = 0;
 
+  Scene *scene = ac->scene;
   ViewLayer *view_layer = (ViewLayer *)ac->view_layer;
-  Base *base;
 
   /* Include all annotation datablocks. */
   if (((ads->filterflag & ADS_FILTER_ONLYSEL) == 0) ||
@@ -1857,7 +1862,8 @@ static size_t animdata_filter_gpencil(bAnimContext *ac,
     }
   }
   /* Objects in the scene */
-  for (base = view_layer->object_bases.first; base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     /* Only consider this object if it has got some GP data (saving on all the other tests) */
     if (base->object && (base->object->type == OB_GPENCIL)) {
       Object *ob = base->object;
@@ -1874,8 +1880,8 @@ static size_t animdata_filter_gpencil(bAnimContext *ac,
       if ((filter_mode & ANIMFILTER_DATA_VISIBLE) && !(ads->filterflag & ADS_FILTER_INCL_HIDDEN)) {
         /* Layer visibility - we check both object and base,
          * since these may not be in sync yet. */
-        if ((base->flag & BASE_VISIBLE_DEPSGRAPH) == 0 ||
-            (base->flag & BASE_VISIBLE_VIEWLAYER) == 0) {
+        if ((base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) == 0 ||
+            (base->flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) == 0) {
           continue;
         }
 
@@ -3087,7 +3093,8 @@ static bool animdata_filter_base_is_ok(bDopeSheet *ads,
    */
   if ((filter_mode & ANIMFILTER_DATA_VISIBLE) && !(ads->filterflag & ADS_FILTER_INCL_HIDDEN)) {
     /* layer visibility - we check both object and base, since these may not be in sync yet */
-    if ((base->flag & BASE_VISIBLE_DEPSGRAPH) == 0 || (base->flag & BASE_VISIBLE_VIEWLAYER) == 0) {
+    if ((base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) == 0 ||
+        (base->flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) == 0) {
       return false;
     }
 
@@ -3167,16 +3174,19 @@ static int ds_base_sorting_cmp(const void *base1_ptr, const void *base2_ptr)
 
 /* Get a sorted list of all the bases - for inclusion in dopesheet (when drawing channels) */
 static Base **animdata_filter_ds_sorted_bases(bDopeSheet *ads,
+                                              const Scene *scene,
                                               ViewLayer *view_layer,
                                               int filter_mode,
                                               size_t *r_usable_bases)
 {
   /* Create an array with space for all the bases, but only containing the usable ones */
-  size_t tot_bases = BLI_listbase_count(&view_layer->object_bases);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ListBase *object_bases = BKE_view_layer_object_bases_get(view_layer);
+  size_t tot_bases = BLI_listbase_count(object_bases);
   size_t num_bases = 0;
 
   Base **sorted_bases = MEM_mallocN(sizeof(Base *) * tot_bases, "Dopesheet Usable Sorted Bases");
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     if (animdata_filter_base_is_ok(ads, base, OB_MODE_OBJECT, filter_mode)) {
       sorted_bases[num_bases++] = base;
     }
@@ -3246,14 +3256,17 @@ static size_t animdata_filter_dopesheet(bAnimContext *ac,
    * - Don't do this if this behavior has been turned off (i.e. due to it being too slow)
    * - Don't do this if there's just a single object
    */
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ListBase *object_bases = BKE_view_layer_object_bases_get(view_layer);
   if ((filter_mode & ANIMFILTER_LIST_CHANNELS) && !(ads->flag & ADS_FLAG_NO_DB_SORT) &&
-      (view_layer->object_bases.first != view_layer->object_bases.last)) {
+      (object_bases->first != object_bases->last)) {
     /* Filter list of bases (i.e. objects), sort them, then add their contents normally... */
     /* TODO: Cache the old sorted order - if the set of bases hasn't changed, don't re-sort... */
     Base **sorted_bases;
     size_t num_bases;
 
-    sorted_bases = animdata_filter_ds_sorted_bases(ads, view_layer, filter_mode, &num_bases);
+    sorted_bases = animdata_filter_ds_sorted_bases(
+        ads, scene, view_layer, filter_mode, &num_bases);
     if (sorted_bases) {
       /* Add the necessary channels for these bases... */
       for (size_t i = 0; i < num_bases; i++) {
@@ -3270,9 +3283,9 @@ static size_t animdata_filter_dopesheet(bAnimContext *ac,
     /* Filter and add contents of each base (i.e. object) without them sorting first
      * NOTE: This saves performance in cases where order doesn't matter
      */
-    Object *obact = OBACT(view_layer);
+    Object *obact = BKE_view_layer_active_object_get(view_layer);
     const eObjectMode object_mode = obact ? obact->mode : OB_MODE_OBJECT;
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    LISTBASE_FOREACH (Base *, base, object_bases) {
       if (animdata_filter_base_is_ok(ads, base, object_mode, filter_mode)) {
         /* since we're still here, this object should be usable */
         items += animdata_filter_dopesheet_ob(ac, anim_data, ads, base, filter_mode);
@@ -3404,9 +3417,8 @@ static size_t animdata_filter_remove_duplis(ListBase *anim_data)
   GSet *gs;
   size_t items = 0;
 
-  /* build new hashtable to efficiently store and retrieve which entries have been
-   * encountered already while searching
-   */
+  /* Build new hash-table to efficiently store and retrieve which entries have been
+   * encountered already while searching. */
   gs = BLI_gset_ptr_new(__func__);
 
   /* loop through items, removing them from the list if a similar item occurs already */
diff --git a/source/blender/editors/animation/anim_ipo_utils.c b/source/blender/editors/animation/anim_ipo_utils.c
index f01b3522547..93d83ff5f8e 100644
--- a/source/blender/editors/animation/anim_ipo_utils.c
+++ b/source/blender/editors/animation/anim_ipo_utils.c
@@ -22,6 +22,7 @@
 #include "DNA_anim_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "ED_anim_api.h"
diff --git a/source/blender/editors/animation/anim_markers.c b/source/blender/editors/animation/anim_markers.c
index 03a2caf4b7d..94746837259 100644
--- a/source/blender/editors/animation/anim_markers.c
+++ b/source/blender/editors/animation/anim_markers.c
@@ -51,7 +51,6 @@
 #include "ED_screen.h"
 #include "ED_select_utils.h"
 #include "ED_transform.h"
-#include "ED_types.h"
 #include "ED_util.h"
 
 #include "DEG_depsgraph.h"
@@ -402,6 +401,7 @@ static void draw_marker_name(const uchar *text_color,
                              const uiFontStyle *fstyle,
                              TimeMarker *marker,
                              float marker_x,
+                             float xmax,
                              float text_y)
 {
   const char *name = marker->name;
@@ -419,8 +419,16 @@ static void draw_marker_name(const uchar *text_color,
   }
 #endif
 
-  int name_x = marker_x + UI_DPI_ICON_SIZE * 0.6;
-  UI_fontstyle_draw_simple(fstyle, name_x, text_y, name, final_text_color);
+  const int icon_half_width = UI_DPI_ICON_SIZE * 0.6;
+  const struct uiFontStyleDraw_Params fs_params = {.align = UI_STYLE_TEXT_LEFT, .word_wrap = 0};
+  const struct rcti rect = {
+      .xmin = marker_x + icon_half_width,
+      .xmax = xmax - icon_half_width,
+      .ymin = text_y,
+      .ymax = text_y,
+  };
+
+  UI_fontstyle_draw(fstyle, &rect, name, strlen(name), final_text_color, &fs_params);
 }
 
 static void draw_marker_line(const uchar *color, int xpos, int ymin, int ymax)
@@ -428,7 +436,7 @@ static void draw_marker_line(const uchar *color, int xpos, int ymin, int ymax)
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -450,9 +458,7 @@ static void draw_marker_line(const uchar *color, int xpos, int ymin, int ymax)
 static int marker_get_icon_id(TimeMarker *marker, int flag)
 {
   if (flag & DRAW_MARKERS_LOCAL) {
-    return (marker->flag & ACTIVE) ? ICON_PMARKER_ACT :
-           (marker->flag & SELECT) ? ICON_PMARKER_SEL :
-                                     ICON_PMARKER;
+    return (marker->flag & SELECT) ? ICON_PMARKER_SEL : ICON_PMARKER;
   }
 #ifdef DURIAN_CAMERA_SWITCH
   if (marker->camera) {
@@ -462,8 +468,13 @@ static int marker_get_icon_id(TimeMarker *marker, int flag)
   return (marker->flag & SELECT) ? ICON_MARKER_HLT : ICON_MARKER;
 }
 
-static void draw_marker(
-    const uiFontStyle *fstyle, TimeMarker *marker, int cfra, int xpos, int flag, int region_height)
+static void draw_marker(const uiFontStyle *fstyle,
+                        TimeMarker *marker,
+                        int xpos,
+                        int xmax,
+                        int flag,
+                        int region_height,
+                        bool is_elevated)
 {
   uchar line_color[4], text_color[4];
 
@@ -479,18 +490,17 @@ static void draw_marker(
   GPU_blend(GPU_BLEND_NONE);
 
   float name_y = UI_DPI_FAC * 18;
-  /* Give an offset to the marker name when selected,
-   * or when near the current frame (5 frames range, starting from the current one). */
-  if ((marker->flag & SELECT) || (cfra - 4 <= marker->frame && marker->frame <= cfra)) {
+  /* Give an offset to the marker that is elevated. */
+  if (is_elevated) {
     name_y += UI_DPI_FAC * 10;
   }
-  draw_marker_name(text_color, fstyle, marker, xpos, name_y);
+  draw_marker_name(text_color, fstyle, marker, xpos, xmax, name_y);
 }
 
 static void draw_markers_background(rctf *rect)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   uchar shade[4];
   UI_GetThemeColor4ubv(TH_TIME_SCRUB_BACKGROUND, shade);
@@ -532,6 +542,14 @@ static void get_marker_clip_frame_range(View2D *v2d, float xscale, int r_range[2
   r_range[1] = v2d->cur.xmax + font_width_max;
 }
 
+static int markers_frame_sort(const void *a, const void *b)
+{
+  const TimeMarker *marker_a = a;
+  const TimeMarker *marker_b = b;
+
+  return marker_a->frame > marker_b->frame;
+}
+
 void ED_markers_draw(const bContext *C, int flag)
 {
   ListBase *markers = ED_context_get_markers(C);
@@ -561,22 +579,69 @@ void ED_markers_draw(const bContext *C, int flag)
 
   const uiFontStyle *fstyle = UI_FSTYLE_WIDGET;
 
-  /* Separate loops in order to draw selected markers on top */
-  LISTBASE_FOREACH (TimeMarker *, marker, markers) {
-    if ((marker->flag & SELECT) == 0) {
-      if (marker_is_in_frame_range(marker, clip_frame_range)) {
-        draw_marker(fstyle, marker, cfra, marker->frame * xscale, flag, region->winy);
-      }
+  /* Markers are not stored by frame order, so we need to sort it here. */
+  ListBase sorted_markers;
+
+  BLI_duplicatelist(&sorted_markers, markers);
+  BLI_listbase_sort(&sorted_markers, markers_frame_sort);
+
+  /**
+   * Set a temporary bit in the marker's flag to indicate that it should be elevated.
+   * This bit will be flipped back at the end of this function.
+   */
+  const int ELEVATED = 0x10;
+  LISTBASE_FOREACH (TimeMarker *, marker, &sorted_markers) {
+    const bool is_elevated = (marker->flag & SELECT) ||
+                             (cfra >= marker->frame &&
+                              (marker->next == NULL || cfra < marker->next->frame));
+    SET_FLAG_FROM_TEST(marker->flag, is_elevated, ELEVATED);
+  }
+
+  /* Separate loops in order to draw selected markers on top. */
+
+  /**
+   * Draw non-elevated markers first.
+   * Note that unlike the elevated markers, these marker names will always be clipped by the
+   * proceeding marker. This is done because otherwise, the text overlaps with the icon of the
+   * marker itself.
+   */
+  LISTBASE_FOREACH (TimeMarker *, marker, &sorted_markers) {
+    if ((marker->flag & ELEVATED) == 0 && marker_is_in_frame_range(marker, clip_frame_range)) {
+      const int xmax = marker->next ? marker->next->frame : clip_frame_range[1] + 1;
+      draw_marker(
+          fstyle, marker, marker->frame * xscale, xmax * xscale, flag, region->winy, false);
     }
   }
-  LISTBASE_FOREACH (TimeMarker *, marker, markers) {
-    if (marker->flag & SELECT) {
-      if (marker_is_in_frame_range(marker, clip_frame_range)) {
-        draw_marker(fstyle, marker, cfra, marker->frame * xscale, flag, region->winy);
-      }
+
+  /* Now draw the elevated markers */
+  for (TimeMarker *marker = sorted_markers.first; marker != NULL;) {
+
+    /* Skip this marker if it is elevated or out of the frame range. */
+    if ((marker->flag & ELEVATED) == 0 || !marker_is_in_frame_range(marker, clip_frame_range)) {
+      marker = marker->next;
+      continue;
     }
+
+    /* Find the next elevated marker. */
+    /* We use the next marker to determine how wide our text should be */
+    TimeMarker *next_marker = marker->next;
+    while (next_marker != NULL && (next_marker->flag & ELEVATED) == 0) {
+      next_marker = next_marker->next;
+    }
+
+    const int xmax = next_marker ? next_marker->frame : clip_frame_range[1] + 1;
+    draw_marker(fstyle, marker, marker->frame * xscale, xmax * xscale, flag, region->winy, true);
+
+    marker = next_marker;
+  }
+
+  /* Reset the elevated flag. */
+  LISTBASE_FOREACH (TimeMarker *, marker, &sorted_markers) {
+    marker->flag &= ~ELEVATED;
   }
 
+  BLI_freelistN(&sorted_markers);
+
   GPU_matrix_pop();
 }
 
@@ -1045,7 +1110,7 @@ static void MARKER_OT_move(wmOperatorType *ot)
   RNA_def_int(ot->srna, "frames", 0, INT_MIN, INT_MAX, "Frames", "", INT_MIN, INT_MAX);
   PropertyRNA *prop = RNA_def_boolean(
       ot->srna, "tweak", 0, "Tweak", "Operator has been activated using a click-drag event");
-  RNA_def_property_flag(prop, PROP_SKIP_SAVE);
+  RNA_def_property_flag(prop, PROP_SKIP_SAVE | PROP_HIDDEN);
 }
 
 /** \} */
@@ -1190,14 +1255,14 @@ static int select_timeline_marker_frame(ListBase *markers,
       deselect_markers(markers);
     }
 
-    LISTBASE_CIRCULAR_FORWARD_BEGIN (markers, marker, marker_cycle_selected) {
+    LISTBASE_CIRCULAR_FORWARD_BEGIN (TimeMarker *, markers, marker, marker_cycle_selected) {
       /* this way a not-extend select will always give 1 selected marker */
       if (marker->frame == frame) {
         marker->flag ^= SELECT;
         break;
       }
     }
-    LISTBASE_CIRCULAR_FORWARD_END(markers, marker, marker_cycle_selected);
+    LISTBASE_CIRCULAR_FORWARD_END(TimeMarker *, markers, marker, marker_cycle_selected);
   }
 
   return ret_val;
@@ -1216,7 +1281,7 @@ static void select_marker_camera_switch(
     int sel = 0;
 
     if (!extend) {
-      BKE_view_layer_base_deselect_all(view_layer);
+      BKE_view_layer_base_deselect_all(scene, view_layer);
     }
 
     for (marker = markers->first; marker; marker = marker->next) {
@@ -1226,6 +1291,7 @@ static void select_marker_camera_switch(
       }
     }
 
+    BKE_view_layer_synced_ensure(scene, view_layer);
     for (marker = markers->first; marker; marker = marker->next) {
       if (marker->camera) {
         if (marker->frame == cfra) {
@@ -1313,7 +1379,7 @@ static void MARKER_OT_select(wmOperatorType *ot)
   ot->modal = WM_generic_select_modal;
 
   /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_UNDO;
 
   WM_operator_properties_generic_select(ot);
   prop = RNA_def_boolean(ot->srna, "extend", 0, "Extend", "Extend the selection");
@@ -1413,7 +1479,7 @@ static void MARKER_OT_select_box(wmOperatorType *ot)
   ot->poll = ed_markers_poll_markers_exist;
 
   /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_UNDO;
 
   /* properties */
   WM_operator_properties_gesture_box(ot);
@@ -1537,8 +1603,8 @@ static void MARKER_OT_select_leftright(wmOperatorType *ot)
 
   /* rna storage */
   RNA_def_enum(
-      ot->srna, "mode", prop_markers_select_leftright_modes, MARKERS_LRSEL_LEFT, "mode", "Mode");
-  RNA_def_boolean(ot->srna, "extend", false, "extend", "Extend");
+      ot->srna, "mode", prop_markers_select_leftright_modes, MARKERS_LRSEL_LEFT, "Mode", "");
+  RNA_def_boolean(ot->srna, "extend", false, "Extend Select", "");
 }
 
 /** \} */
@@ -1588,12 +1654,13 @@ static void MARKER_OT_delete(wmOperatorType *ot)
   ot->idname = "MARKER_OT_delete";
 
   /* api callbacks */
-  ot->invoke = WM_operator_confirm;
+  ot->invoke = WM_operator_confirm_or_exec;
   ot->exec = ed_marker_delete_exec;
   ot->poll = ed_markers_poll_selected_no_locked_markers;
 
   /* flags */
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  WM_operator_properties_confirm_or_exec(ot);
 }
 
 /** \} */
diff --git a/source/blender/editors/animation/drivers.c b/source/blender/editors/animation/drivers.c
index c6f68228807..63794caf5a7 100644
--- a/source/blender/editors/animation/drivers.c
+++ b/source/blender/editors/animation/drivers.c
@@ -39,6 +39,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "anim_intern.h"
@@ -124,7 +125,7 @@ struct FCurve *alloc_driver_fcurve(const char rna_path[],
       insert_vert_fcurve(
           fcu, 1.0f, 1.0f, BEZT_KEYTYPE_KEYFRAME, INSERTKEY_FAST | INSERTKEY_NO_USERPREF);
       fcu->extend = FCURVE_EXTRAPOLATE_LINEAR;
-      calchandles_fcurve(fcu);
+      BKE_fcurve_handles_recalc(fcu);
     }
   }
 
diff --git a/source/blender/editors/animation/fmodifier_ui.c b/source/blender/editors/animation/fmodifier_ui.c
index 6f31472907b..d2f0ee622c4 100644
--- a/source/blender/editors/animation/fmodifier_ui.c
+++ b/source/blender/editors/animation/fmodifier_ui.c
@@ -1020,7 +1020,7 @@ bool ANIM_fmodifiers_paste_from_buf(ListBase *modifiers, bool replace, FCurve *c
 
   /* adding or removing the Cycles modifier requires an update to handles */
   if (curve && BKE_fcurve_is_cyclic(curve) != was_cyclic) {
-    calchandles_fcurve(curve);
+    BKE_fcurve_handles_recalc(curve);
   }
 
   /* did we succeed? */
diff --git a/source/blender/editors/animation/keyframes_draw.c b/source/blender/editors/animation/keyframes_draw.c
index 786204a52ed..6df9dc1e86d 100644
--- a/source/blender/editors/animation/keyframes_draw.c
+++ b/source/blender/editors/animation/keyframes_draw.c
@@ -608,7 +608,7 @@ static AnimKeylistDrawListElem *ed_keylist_draw_list_add_elem(
   return draw_elem;
 }
 
-/* *************************** Channel Drawing Funcs *************************** */
+/* *************************** Channel Drawing Functions *************************** */
 
 void draw_summary_channel(struct AnimKeylistDrawList *draw_list,
                           bAnimContext *ac,
diff --git a/source/blender/editors/animation/keyframes_edit.c b/source/blender/editors/animation/keyframes_edit.c
index 88207f7d514..2a94c5db439 100644
--- a/source/blender/editors/animation/keyframes_edit.c
+++ b/source/blender/editors/animation/keyframes_edit.c
@@ -218,7 +218,7 @@ static short ob_keyframes_loop(KeyframeEditData *ked,
   ac.datatype = ANIMCONT_CHANNEL;
 
   /* get F-Curves to take keyframes from */
-  filter = ANIMFILTER_DATA_VISIBLE; /* curves only */
+  filter = ANIMFILTER_DATA_VISIBLE | ANIMFILTER_FCURVESONLY;
   ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
   /* Loop through each F-Curve, applying the operation as required,
@@ -267,7 +267,7 @@ static short scene_keyframes_loop(KeyframeEditData *ked,
   ac.datatype = ANIMCONT_CHANNEL;
 
   /* get F-Curves to take keyframes from */
-  filter = ANIMFILTER_DATA_VISIBLE; /* curves only */
+  filter = ANIMFILTER_DATA_VISIBLE | ANIMFILTER_FCURVESONLY;
   ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
   /* Loop through each F-Curve, applying the operation as required,
@@ -444,7 +444,7 @@ void ANIM_animdata_keyframe_callback(bAnimContext *ac,
   ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 
   for (ale = anim_data.first; ale; ale = ale->next) {
-    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, callback_fn, calchandles_fcurve);
+    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, callback_fn, BKE_fcurve_handles_recalc);
     ale->update |= ANIM_UPDATE_DEFAULT;
   }
 
@@ -1303,7 +1303,8 @@ void ANIM_fcurve_equalize_keyframes_loop(FCurve *fcu,
 
     /* Perform handle equalization if mode is 'Both' or 'Left'. */
     if (mode & EQUALIZE_HANDLES_LEFT) {
-      /*If left handle type is 'Auto', 'Auto Clamped', or 'Vector', convert handles to 'Aligned'.*/
+      /* If left handle type is 'Auto', 'Auto Clamped', or 'Vector', convert handles to 'Aligned'.
+       */
       if (ELEM(bezt->h1, HD_AUTO, HD_AUTO_ANIM, HD_VECT)) {
         bezt->h1 = HD_ALIGN;
         bezt->h2 = HD_ALIGN;
@@ -1319,8 +1320,8 @@ void ANIM_fcurve_equalize_keyframes_loop(FCurve *fcu,
 
     /* Perform handle equalization if mode is 'Both' or 'Right'. */
     if (mode & EQUALIZE_HANDLES_RIGHT) {
-      /*If right handle type is 'Auto', 'Auto Clamped', or 'Vector', convert handles to
-       * 'Aligned'.*/
+      /* If right handle type is 'Auto', 'Auto Clamped', or 'Vector', convert handles to
+       * 'Aligned'. */
       if (ELEM(bezt->h2, HD_AUTO, HD_AUTO_ANIM, HD_VECT)) {
         bezt->h1 = HD_ALIGN;
         bezt->h2 = HD_ALIGN;
diff --git a/source/blender/editors/animation/keyframes_general.c b/source/blender/editors/animation/keyframes_general.c
index dd88752af14..40f0ac59b01 100644
--- a/source/blender/editors/animation/keyframes_general.c
+++ b/source/blender/editors/animation/keyframes_general.c
@@ -29,6 +29,7 @@
 
 #include "RNA_access.h"
 #include "RNA_enum_types.h"
+#include "RNA_path.h"
 
 #include "ED_anim_api.h"
 #include "ED_keyframes_edit.h"
@@ -47,77 +48,6 @@
 
 /* **************************************************** */
 
-void delete_fcurve_key(FCurve *fcu, int index, bool do_recalc)
-{
-  /* sanity check */
-  if (fcu == NULL) {
-    return;
-  }
-
-  /* verify the index:
-   * 1) cannot be greater than the number of available keyframes
-   * 2) negative indices are for specifying a value from the end of the array
-   */
-  if (abs(index) >= fcu->totvert) {
-    return;
-  }
-  if (index < 0) {
-    index += fcu->totvert;
-  }
-
-  /* Delete this keyframe */
-  memmove(
-      &fcu->bezt[index], &fcu->bezt[index + 1], sizeof(BezTriple) * (fcu->totvert - index - 1));
-  fcu->totvert--;
-
-  if (fcu->totvert == 0) {
-    MEM_SAFE_FREE(fcu->bezt);
-  }
-
-  /* recalc handles - only if it won't cause problems */
-  if (do_recalc) {
-    calchandles_fcurve(fcu);
-  }
-}
-
-bool delete_fcurve_keys(FCurve *fcu)
-{
-  bool changed = false;
-
-  if (fcu->bezt == NULL) { /* ignore baked curves */
-    return false;
-  }
-
-  /* Delete selected BezTriples */
-  for (int i = 0; i < fcu->totvert; i++) {
-    if (fcu->bezt[i].f2 & SELECT) {
-      if (i == fcu->active_keyframe_index) {
-        BKE_fcurve_active_keyframe_set(fcu, NULL);
-      }
-      memmove(&fcu->bezt[i], &fcu->bezt[i + 1], sizeof(BezTriple) * (fcu->totvert - i - 1));
-      fcu->totvert--;
-      i--;
-      changed = true;
-    }
-  }
-
-  /* Free the array of BezTriples if there are not keyframes */
-  if (fcu->totvert == 0) {
-    clear_fcurve_keys(fcu);
-  }
-
-  return changed;
-}
-
-void clear_fcurve_keys(FCurve *fcu)
-{
-  MEM_SAFE_FREE(fcu->bezt);
-
-  fcu->totvert = 0;
-}
-
-/* ---------------- */
-
 bool duplicate_fcurve_keys(FCurve *fcu)
 {
   bool changed = false;
@@ -282,7 +212,7 @@ void clean_fcurve(struct bAnimContext *ac, bAnimListElem *ale, float thresh, boo
     }
 
     if (fcu->bezt->vec[1][1] == default_value) {
-      clear_fcurve_keys(fcu);
+      BKE_fcurve_delete_keys_all(fcu);
 
       /* check if curve is really unused and if it is, return signal for deletion */
       if (BKE_fcurve_is_empty(fcu)) {
@@ -679,7 +609,7 @@ void smooth_fcurve(FCurve *fcu)
   }
 
   /* recalculate handles */
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 /* ---------------- */
@@ -762,7 +692,7 @@ void sample_fcurve(FCurve *fcu)
   }
 
   /* recalculate channel's handles? */
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 /* **************************************************** */
@@ -1121,7 +1051,7 @@ static void paste_animedit_keys_fcurve(
 
     case KEYFRAME_PASTE_MERGE_OVER:
       /* remove all keys */
-      clear_fcurve_keys(fcu);
+      BKE_fcurve_delete_keys_all(fcu);
       break;
 
     case KEYFRAME_PASTE_MERGE_OVER_RANGE:
@@ -1148,7 +1078,7 @@ static void paste_animedit_keys_fcurve(
         }
 
         /* remove frames in the range */
-        delete_fcurve_keys(fcu);
+        BKE_fcurve_delete_keys_selected(fcu);
       }
       break;
     }
@@ -1182,7 +1112,7 @@ static void paste_animedit_keys_fcurve(
   }
 
   /* recalculate F-Curve's handles? */
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 const EnumPropertyItem rna_enum_keyframe_paste_offset_items[] = {
diff --git a/source/blender/editors/animation/keyframes_keylist.cc b/source/blender/editors/animation/keyframes_keylist.cc
index 8dc598e6e2d..da266dd4253 100644
--- a/source/blender/editors/animation/keyframes_keylist.cc
+++ b/source/blender/editors/animation/keyframes_keylist.cc
@@ -943,7 +943,8 @@ void scene_to_keylist(bDopeSheet *ads, Scene *sce, AnimKeylist *keylist, const i
   ac.datatype = ANIMCONT_CHANNEL;
 
   /* get F-Curves to take keyframes from */
-  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE; /* curves only */
+  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE | ANIMFILTER_FCURVESONLY;
+
   ANIM_animdata_filter(
       &ac, &anim_data, filter, ac.data, static_cast<eAnimCont_Types>(ac.datatype));
 
@@ -980,7 +981,7 @@ void ob_to_keylist(bDopeSheet *ads, Object *ob, AnimKeylist *keylist, const int
   ac.datatype = ANIMCONT_CHANNEL;
 
   /* get F-Curves to take keyframes from */
-  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE; /* curves only */
+  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE | ANIMFILTER_FCURVESONLY;
   ANIM_animdata_filter(
       &ac, &anim_data, filter, ac.data, static_cast<eAnimCont_Types>(ac.datatype));
 
@@ -1015,7 +1016,7 @@ void cachefile_to_keylist(bDopeSheet *ads,
 
   /* get F-Curves to take keyframes from */
   ListBase anim_data = {nullptr, nullptr};
-  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE; /* curves only */
+  const eAnimFilter_Flags filter = ANIMFILTER_DATA_VISIBLE | ANIMFILTER_FCURVESONLY;
   ANIM_animdata_filter(
       &ac, &anim_data, filter, ac.data, static_cast<eAnimCont_Types>(ac.datatype));
 
diff --git a/source/blender/editors/animation/keyframing.c b/source/blender/editors/animation/keyframing.c
index 2fa8907de71..acf53541843 100644
--- a/source/blender/editors/animation/keyframing.c
+++ b/source/blender/editors/animation/keyframing.c
@@ -64,6 +64,7 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 #include "RNA_enum_types.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "anim_intern.h"
@@ -639,7 +640,7 @@ int insert_vert_fcurve(
    * - we may calculate twice (due to auto-handle needing to be calculated twice)
    */
   if ((flag & INSERTKEY_FAST) == 0) {
-    calchandles_fcurve(fcu);
+    BKE_fcurve_handles_recalc(fcu);
   }
 
   /* return the index at which the keyframe was added */
@@ -1080,10 +1081,7 @@ static float *visualkey_get_values(
   }
 
   if (strstr(identifier, "rotation_quaternion")) {
-    float mat3[3][3];
-
-    copy_m3_m4(mat3, tmat);
-    mat3_to_quat_is_ok(buffer, mat3);
+    mat4_to_quat(buffer, tmat);
 
     *r_count = 4;
     return buffer;
@@ -1282,10 +1280,12 @@ static bool insert_keyframe_value(ReportList *reports,
     /* delete keyframe immediately before/after newly added */
     switch (insert_mode) {
       case KEYNEEDED_DELPREV:
-        delete_fcurve_key(fcu, fcu->totvert - 2, 1);
+        BKE_fcurve_delete_key(fcu, fcu->totvert - 2);
+        BKE_fcurve_handles_recalc(fcu);
         break;
       case KEYNEEDED_DELNEXT:
-        delete_fcurve_key(fcu, 1, 1);
+        BKE_fcurve_delete_key(fcu, 1);
+        BKE_fcurve_handles_recalc(fcu);
         break;
     }
 
@@ -1683,7 +1683,8 @@ static bool delete_keyframe_fcurve(AnimData *adt, FCurve *fcu, float cfra)
   i = BKE_fcurve_bezt_binarysearch_index(fcu->bezt, cfra, fcu->totvert, &found);
   if (found) {
     /* delete the key at the index (will sanity check + do recalc afterwards) */
-    delete_fcurve_key(fcu, i, 1);
+    BKE_fcurve_delete_key(fcu, i);
+    BKE_fcurve_handles_recalc(fcu);
 
     /* Only delete curve too if it won't be doing anything anymore */
     if (BKE_fcurve_is_empty(fcu)) {
@@ -2709,7 +2710,8 @@ static int delete_key_button_exec(bContext *C, wmOperator *op)
           i = BKE_fcurve_bezt_binarysearch_index(fcu->bezt, cfra, fcu->totvert, &found);
           if (found) {
             /* delete the key at the index (will sanity check + do recalc afterwards) */
-            delete_fcurve_key(fcu, i, 1);
+            BKE_fcurve_delete_key(fcu, i);
+            BKE_fcurve_handles_recalc(fcu);
             changed = true;
           }
         }
diff --git a/source/blender/editors/animation/keyingsets.c b/source/blender/editors/animation/keyingsets.c
index 97b81277008..97e90af019b 100644
--- a/source/blender/editors/animation/keyingsets.c
+++ b/source/blender/editors/animation/keyingsets.c
@@ -39,6 +39,7 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 #include "RNA_enum_types.h"
+#include "RNA_path.h"
 
 #include "anim_intern.h"
 
@@ -588,7 +589,7 @@ void ANIM_keyingset_info_unregister(Main *bmain, KeyingSetInfo *ksi)
 
   /* find relevant builtin KeyingSets which use this, and remove them */
   /* TODO: this isn't done now, since unregister is really only used at the moment when we
-   * reload the scripts, which kindof defeats the purpose of "builtin"? */
+   * reload the scripts, which kind of defeats the purpose of "builtin"? */
   for (ks = builtin_keyingsets.first; ks; ks = ksn) {
     ksn = ks->next;
 
@@ -713,7 +714,7 @@ static void anim_keyingset_visit_for_search_impl(const bContext *C,
                                                  void *visit_user_data,
                                                  const bool use_poll)
 {
-  /* Poll requires context.  */
+  /* Poll requires context. */
   if (use_poll && (C == NULL)) {
     return;
   }
diff --git a/source/blender/editors/animation/time_scrub_ui.c b/source/blender/editors/animation/time_scrub_ui.c
index 623d4e605ba..ebeac6552cd 100644
--- a/source/blender/editors/animation/time_scrub_ui.c
+++ b/source/blender/editors/animation/time_scrub_ui.c
@@ -48,7 +48,7 @@ static int get_centered_text_y(const rcti *rect)
 static void draw_background(const rcti *rect)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColor(TH_TIME_SCRUB_BACKGROUND);
 
@@ -97,7 +97,7 @@ static void draw_current_frame(const Scene *scene,
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
   GPU_blend(GPU_BLEND_ALPHA);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Outline. */
   immUniformThemeColorShadeAlpha(TH_BACK, -25, -100);
@@ -208,7 +208,7 @@ void ED_time_scrub_channel_search_draw(const bContext *C, ARegion *region, bDope
   rect.ymax = region->winy;
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColor(TH_BACK);
   immRectf(pos, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
   immUnbindProgram();
diff --git a/source/blender/editors/armature/CMakeLists.txt b/source/blender/editors/armature/CMakeLists.txt
index 3ce5b70918d..243b2950e2e 100644
--- a/source/blender/editors/armature/CMakeLists.txt
+++ b/source/blender/editors/armature/CMakeLists.txt
@@ -14,7 +14,6 @@ set(INC
   ../../windowmanager
   ../../../../intern/clog
   ../../../../intern/eigen
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/armature/armature_add.c b/source/blender/editors/armature/armature_add.c
index 2071f056f9e..17484b2b0b7 100644
--- a/source/blender/editors/armature/armature_add.c
+++ b/source/blender/editors/armature/armature_add.c
@@ -541,7 +541,7 @@ static void updateDuplicateActionConstraintSettings(
   }
   BLI_freelistN(&ani_curves);
 
-  /* Make deps graph aware of our changes */
+  /* Make depsgraph aware of our changes. */
   DEG_id_tag_update(&act->id, ID_RECALC_ANIMATION_NO_FLUSH);
 }
 
@@ -920,6 +920,7 @@ EditBone *duplicateEditBone(EditBone *cur_bone, const char *name, ListBase *edit
 
 static int armature_duplicate_selected_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool do_flip_names = RNA_boolean_get(op->ptr, "do_flip_names");
 
@@ -930,7 +931,7 @@ static int armature_duplicate_selected_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     EditBone *ebone_iter;
     /* The beginning of the duplicated bones in the edbo list */
@@ -1094,6 +1095,7 @@ static EditBone *get_symmetrized_bone(bArmature *arm, EditBone *bone)
  */
 static int armature_symmetrize_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const int direction = RNA_enum_get(op->ptr, "direction");
   const int axis = 0;
@@ -1105,7 +1107,7 @@ static int armature_symmetrize_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     bArmature *arm = obedit->data;
@@ -1349,13 +1351,14 @@ void ARMATURE_OT_symmetrize(wmOperatorType *ot)
 /* if forked && mirror-edit: makes two bones with flipped names */
 static int armature_extrude_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool forked = RNA_boolean_get(op->ptr, "forked");
   bool changed_multi = false;
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
diff --git a/source/blender/editors/armature/armature_edit.c b/source/blender/editors/armature/armature_edit.c
index 3c445f46902..81b1c096d76 100644
--- a/source/blender/editors/armature/armature_edit.c
+++ b/source/blender/editors/armature/armature_edit.c
@@ -254,6 +254,7 @@ static const EnumPropertyItem prop_calc_roll_types[] = {
 
 static int armature_calc_roll_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_active = CTX_data_edit_object(C);
   int ret = OPERATOR_FINISHED;
@@ -267,7 +268,7 @@ static int armature_calc_roll_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -285,7 +286,6 @@ static int armature_calc_roll_exec(bContext *C, wmOperator *op)
     invert_m3(imat);
 
     if (type == CALC_ROLL_CURSOR) { /* Cursor */
-      Scene *scene = CTX_data_scene(C);
       float cursor_local[3];
       const View3DCursor *cursor = &scene->cursor;
 
@@ -463,12 +463,13 @@ void ARMATURE_OT_calculate_roll(wmOperatorType *ot)
 
 static int armature_roll_clear_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const float roll = RNA_float_get(op->ptr, "roll");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -712,7 +713,7 @@ static int armature_fill_bones_exec(bContext *C, wmOperator *op)
   Object *obedit = NULL;
   {
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    FOREACH_OBJECT_IN_EDIT_MODE_BEGIN (view_layer, v3d, ob_iter) {
+    FOREACH_OBJECT_IN_EDIT_MODE_BEGIN (scene, view_layer, v3d, ob_iter) {
       if (ob_iter->data == arm) {
         obedit = ob_iter;
       }
@@ -884,10 +885,11 @@ static void armature_clear_swap_done_flags(bArmature *arm)
 
 static int armature_switch_direction_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1157,11 +1159,12 @@ void ARMATURE_OT_align(wmOperatorType *ot)
 
 static int armature_split_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -1226,10 +1229,11 @@ static int armature_delete_selected_exec(bContext *C, wmOperator *UNUSED(op))
     return OPERATOR_CANCELLED;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     bArmature *arm = obedit->data;
@@ -1299,13 +1303,14 @@ static bool armature_dissolve_ebone_cb(const char *bone_name, void *arm_p)
 
 static int armature_dissolve_selected_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   EditBone *ebone, *ebone_next;
   bool changed_multi = false;
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     bArmature *arm = obedit->data;
@@ -1471,6 +1476,7 @@ void ARMATURE_OT_dissolve(wmOperatorType *ot)
 
 static int armature_hide_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const int invert = RNA_boolean_get(op->ptr, "unselected") ? BONE_SELECTED : 0;
 
@@ -1481,7 +1487,7 @@ static int armature_hide_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     bArmature *arm = obedit->data;
@@ -1536,11 +1542,12 @@ void ARMATURE_OT_hide(wmOperatorType *ot)
 
 static int armature_reveal_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool select = RNA_boolean_get(op->ptr, "select");
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     bArmature *arm = obedit->data;
diff --git a/source/blender/editors/armature/armature_naming.c b/source/blender/editors/armature/armature_naming.c
index 1f02e24666d..26ec05cc503 100644
--- a/source/blender/editors/armature/armature_naming.c
+++ b/source/blender/editors/armature/armature_naming.c
@@ -13,6 +13,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "DNA_armature_types.h"
+#include "DNA_camera_types.h"
 #include "DNA_constraint_types.h"
 #include "DNA_gpencil_modifier_types.h"
 #include "DNA_gpencil_types.h"
@@ -281,6 +282,17 @@ void ED_armature_bone_rename(Main *bmain,
         }
       }
 
+      /* fix camera focus */
+      if (ob->type == OB_CAMERA) {
+        Camera *cam = (Camera *)ob->data;
+        if ((cam->dof.focus_object != NULL) && (cam->dof.focus_object->data == arm)) {
+          if (STREQ(cam->dof.focus_subtarget, oldname)) {
+            BLI_strncpy(cam->dof.focus_subtarget, newname, MAXBONENAME);
+            DEG_id_tag_update(&cam->id, ID_RECALC_COPY_ON_WRITE);
+          }
+        }
+      }
+
       /* fix grease pencil modifiers and vertex groups */
       if (ob->type == OB_GPENCIL) {
 
@@ -417,6 +429,7 @@ void ED_armature_bones_flip_names(Main *bmain,
 static int armature_flip_names_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_active = CTX_data_edit_object(C);
 
@@ -424,7 +437,7 @@ static int armature_flip_names_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -504,6 +517,7 @@ void ARMATURE_OT_flip_names(wmOperatorType *ot)
 
 static int armature_autoside_names_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Main *bmain = CTX_data_main(C);
   char newname[MAXBONENAME];
@@ -512,7 +526,7 @@ static int armature_autoside_names_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
diff --git a/source/blender/editors/armature/armature_relations.c b/source/blender/editors/armature/armature_relations.c
index 0825d6968c6..9f1883ccac0 100644
--- a/source/blender/editors/armature/armature_relations.c
+++ b/source/blender/editors/armature/armature_relations.c
@@ -610,7 +610,7 @@ static int separate_armature_exec(bContext *C, wmOperator *op)
 
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
 
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     Base *base_old = bases[base_index];
@@ -974,6 +974,7 @@ static void editbone_clear_parent(EditBone *ebone, int mode)
 
 static int armature_parent_clear_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const int val = RNA_enum_get(op->ptr, "type");
 
@@ -984,7 +985,7 @@ static int armature_parent_clear_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
diff --git a/source/blender/editors/armature/armature_select.c b/source/blender/editors/armature/armature_select.c
index 08d5d6558e0..e490f21f16d 100644
--- a/source/blender/editors/armature/armature_select.c
+++ b/source/blender/editors/armature/armature_select.c
@@ -59,7 +59,7 @@ Base *ED_armature_base_and_ebone_from_select_buffer(Base **bases,
   const uint hit_object = select_id & 0xFFFF;
   Base *base = NULL;
   EditBone *ebone = NULL;
-  /* TODO(campbell): optimize, eg: sort & binary search. */
+  /* TODO(@campbellbarton): optimize, eg: sort & binary search. */
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     if (bases[base_index]->object->runtime.select_id == hit_object) {
       base = bases[base_index];
@@ -83,7 +83,7 @@ Object *ED_armature_object_and_ebone_from_select_buffer(Object **objects,
   const uint hit_object = select_id & 0xFFFF;
   Object *ob = NULL;
   EditBone *ebone = NULL;
-  /* TODO(campbell): optimize, eg: sort & binary search. */
+  /* TODO(@campbellbarton): optimize, eg: sort & binary search. */
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     if (objects[ob_index]->runtime.select_id == hit_object) {
       ob = objects[ob_index];
@@ -107,7 +107,7 @@ Base *ED_armature_base_and_pchan_from_select_buffer(Base **bases,
   const uint hit_object = select_id & 0xFFFF;
   Base *base = NULL;
   bPoseChannel *pchan = NULL;
-  /* TODO(campbell): optimize, eg: sort & binary search. */
+  /* TODO(@campbellbarton): optimize, eg: sort & binary search. */
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     if (bases[base_index]->object->runtime.select_id == hit_object) {
       base = bases[base_index];
@@ -339,15 +339,11 @@ static void *ed_armature_pick_bone_impl(
     Base **bases;
 
     if (vc.obedit != NULL) {
-      bases = BKE_view_layer_array_from_bases_in_mode(vc.view_layer,
-                                                      vc.v3d,
-                                                      &bases_len,
-                                                      {
-                                                          .object_mode = OB_MODE_EDIT,
-                                                      });
+      bases = BKE_view_layer_array_from_bases_in_edit_mode(
+          vc.scene, vc.view_layer, vc.v3d, &bases_len);
     }
     else {
-      bases = BKE_object_pose_base_array_get(vc.view_layer, vc.v3d, &bases_len);
+      bases = BKE_object_pose_base_array_get(vc.scene, vc.view_layer, vc.v3d, &bases_len);
     }
 
     void *bone = ed_armature_pick_bone_from_selectbuffer_impl(
@@ -499,10 +495,11 @@ static int armature_select_linked_exec(bContext *C, wmOperator *op)
   const bool all_forks = RNA_boolean_get(op->ptr, "all_forks");
 
   bool changed_multi = false;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -718,7 +715,7 @@ cache_end:
 
   uint bases_len;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc->view_layer, vc->v3d, &bases_len);
+      vc->scene, vc->view_layer, vc->v3d, &bases_len);
 
   /* See if there are any selected bones in this group */
   if (hits > 0) {
@@ -935,7 +932,7 @@ bool ED_armature_edit_deselect_all_visible_multi(bContext *C)
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &bases_len);
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = ED_armature_edit_deselect_all_multi_ex(bases, bases_len);
   MEM_freeN(bases);
   return changed_multi;
@@ -953,6 +950,7 @@ bool ED_armature_edit_select_pick_bone(bContext *C,
                                        const int selmask,
                                        const struct SelectPick_Params *params)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   bool changed = false;
@@ -974,7 +972,7 @@ bool ED_armature_edit_select_pick_bone(bContext *C,
       /* Deselect everything. */
       uint bases_len = 0;
       Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-          view_layer, v3d, &bases_len);
+          scene, view_layer, v3d, &bases_len);
       ED_armature_edit_deselect_all_multi_ex(bases, bases_len);
       MEM_freeN(bases);
       changed = true;
@@ -1105,7 +1103,8 @@ bool ED_armature_edit_select_pick_bone(bContext *C,
       arm->act_edbone = ebone;
     }
 
-    if (view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (BKE_view_layer_active_base_get(view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
@@ -1452,7 +1451,7 @@ static void armature_select_more_less(Object *ob, bool more)
   bArmature *arm = (bArmature *)ob->data;
   EditBone *ebone;
 
-  /* XXX(campbell): eventually we shouldn't need this. */
+  /* XXX(@campbellbarton): eventually we shouldn't need this. */
   ED_armature_edit_sync_selection(arm->edbo);
 
   /* count bones & store selection state */
@@ -1494,10 +1493,11 @@ static void armature_select_more_less(Object *ob, bool more)
 
 static int armature_de_select_more_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     armature_select_more_less(ob, true);
@@ -1533,10 +1533,11 @@ void ARMATURE_OT_select_more(wmOperatorType *ot)
 
 static int armature_de_select_less_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     armature_select_more_less(ob, false);
@@ -1607,6 +1608,7 @@ static float bone_length_squared_worldspace_get(Object *ob, EditBone *ebone)
 
 static void select_similar_length(bContext *C, const float thresh)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_act = CTX_data_edit_object(C);
   EditBone *ebone_act = CTX_data_active_bone(C);
@@ -1618,7 +1620,7 @@ static void select_similar_length(bContext *C, const float thresh)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -1657,6 +1659,7 @@ static void bone_direction_worldspace_get(Object *ob, EditBone *ebone, float *r_
 
 static void select_similar_direction(bContext *C, const float thresh)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_act = CTX_data_edit_object(C);
   EditBone *ebone_act = CTX_data_active_bone(C);
@@ -1666,7 +1669,7 @@ static void select_similar_direction(bContext *C, const float thresh)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -1695,12 +1698,13 @@ static void select_similar_direction(bContext *C, const float thresh)
 
 static void select_similar_layer(bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   EditBone *ebone_act = CTX_data_active_bone(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -1725,6 +1729,7 @@ static void select_similar_layer(bContext *C)
 
 static void select_similar_prefix(bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   EditBone *ebone_act = CTX_data_active_bone(C);
 
@@ -1739,7 +1744,7 @@ static void select_similar_prefix(bContext *C)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -1767,6 +1772,7 @@ static void select_similar_prefix(bContext *C)
 
 static void select_similar_suffix(bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   EditBone *ebone_act = CTX_data_active_bone(C);
 
@@ -1781,7 +1787,7 @@ static void select_similar_suffix(bContext *C)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
@@ -2106,13 +2112,14 @@ void ARMATURE_OT_select_hierarchy(wmOperatorType *ot)
  */
 static int armature_select_mirror_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool active_only = RNA_boolean_get(op->ptr, "only_active");
   const bool extend = RNA_boolean_get(op->ptr, "extend");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
     bArmature *arm = ob->data;
diff --git a/source/blender/editors/armature/armature_skinning.c b/source/blender/editors/armature/armature_skinning.c
index 3a1e7419d3c..e39cc157c19 100644
--- a/source/blender/editors/armature/armature_skinning.c
+++ b/source/blender/editors/armature/armature_skinning.c
@@ -21,6 +21,7 @@
 #include "BKE_action.h"
 #include "BKE_armature.h"
 #include "BKE_deform.h"
+#include "BKE_mesh.h"
 #include "BKE_mesh_iterators.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_modifier.h"
@@ -203,9 +204,9 @@ static void envelope_bone_weighting(Object *ob,
   }
 
   /* for each vertex in the mesh */
+  const MVert *mesh_verts = BKE_mesh_verts(mesh);
   for (int i = 0; i < mesh->totvert; i++) {
-
-    if (use_mask && !(mesh->mvert[i].flag & SELECT)) {
+    if (use_mask && !(mesh_verts[i].flag & SELECT)) {
       continue;
     }
 
@@ -405,9 +406,10 @@ static void add_verts_to_dgroups(ReportList *reports,
   }
 
   /* transform verts to global space */
+  const MVert *mesh_verts = BKE_mesh_verts(mesh);
   for (int i = 0; i < mesh->totvert; i++) {
     if (!vertsfilled) {
-      copy_v3_v3(verts[i], mesh->mvert[i].co);
+      copy_v3_v3(verts[i], mesh_verts[i].co);
     }
     mul_m4_v3(ob->obmat, verts[i]);
   }
diff --git a/source/blender/editors/armature/editarmature_undo.c b/source/blender/editors/armature/editarmature_undo.c
index bcf8b7cff99..379ad4f5376 100644
--- a/source/blender/editors/armature/editarmature_undo.c
+++ b/source/blender/editors/armature/editarmature_undo.c
@@ -97,8 +97,10 @@ static void undoarm_free_data(UndoArmature *uarm)
 
 static Object *editarm_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && obedit->type == OB_ARMATURE) {
     bArmature *arm = obedit->data;
     if (arm->edbo != NULL) {
@@ -139,9 +141,10 @@ static bool armature_undosys_step_encode(struct bContext *C, struct Main *bmain,
 
   /* Important not to use the 3D view when getting objects because all objects
    * outside of this list will be moved out of edit-mode when reading back undo steps. */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
-  Object **objects = ED_undo_editmode_objects_from_view_layer(view_layer, &objects_len);
+  Object **objects = ED_undo_editmode_objects_from_view_layer(scene, view_layer, &objects_len);
 
   us->elems = MEM_callocN(sizeof(*us->elems) * objects_len, __func__);
   us->elems_len = objects_len;
diff --git a/source/blender/editors/armature/meshlaplacian.c b/source/blender/editors/armature/meshlaplacian.c
index 7016511111e..904e6213466 100644
--- a/source/blender/editors/armature/meshlaplacian.c
+++ b/source/blender/editors/armature/meshlaplacian.c
@@ -645,14 +645,16 @@ void heat_bone_weighting(Object *ob,
 {
   LaplacianSystem *sys;
   MLoopTri *mlooptri;
-  MPoly *mp;
-  MLoop *ml;
+  const MPoly *mp;
+  const MLoop *ml;
   float solution, weight;
   int *vertsflipped = NULL, *mask = NULL;
   int a, tris_num, j, bbone, firstsegment, lastsegment;
   bool use_topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
 
-  MVert *mvert = me->mvert;
+  const MVert *mesh_verts = BKE_mesh_verts(me);
+  const MPoly *polys = BKE_mesh_polys(me);
+  const MLoop *loops = BKE_mesh_loops(me);
   bool use_vert_sel = (me->editflag & ME_EDIT_PAINT_VERT_SEL) != 0;
   bool use_face_sel = (me->editflag & ME_EDIT_PAINT_FACE_SEL) != 0;
 
@@ -667,16 +669,16 @@ void heat_bone_weighting(Object *ob,
 
     /*  (added selectedVerts content for vertex mask, they used to just equal 1) */
     if (use_vert_sel) {
-      for (a = 0, mp = me->mpoly; a < me->totpoly; mp++, a++) {
-        for (j = 0, ml = me->mloop + mp->loopstart; j < mp->totloop; j++, ml++) {
-          mask[ml->v] = (mvert[ml->v].flag & SELECT) != 0;
+      for (a = 0, mp = polys; a < me->totpoly; mp++, a++) {
+        for (j = 0, ml = loops + mp->loopstart; j < mp->totloop; j++, ml++) {
+          mask[ml->v] = (mesh_verts[ml->v].flag & SELECT) != 0;
         }
       }
     }
     else if (use_face_sel) {
-      for (a = 0, mp = me->mpoly; a < me->totpoly; mp++, a++) {
+      for (a = 0, mp = polys; a < me->totpoly; mp++, a++) {
         if (mp->flag & ME_FACE_SEL) {
-          for (j = 0, ml = me->mloop + mp->loopstart; j < mp->totloop; j++, ml++) {
+          for (j = 0, ml = loops + mp->loopstart; j < mp->totloop; j++, ml++) {
             mask[ml->v] = 1;
           }
         }
@@ -690,10 +692,10 @@ void heat_bone_weighting(Object *ob,
   sys->heat.tris_num = poly_to_tri_count(me->totpoly, me->totloop);
   mlooptri = MEM_mallocN(sizeof(*sys->heat.mlooptri) * sys->heat.tris_num, __func__);
 
-  BKE_mesh_recalc_looptri(me->mloop, me->mpoly, me->mvert, me->totloop, me->totpoly, mlooptri);
+  BKE_mesh_recalc_looptri(loops, polys, mesh_verts, me->totloop, me->totpoly, mlooptri);
 
   sys->heat.mlooptri = mlooptri;
-  sys->heat.mloop = me->mloop;
+  sys->heat.mloop = loops;
   sys->heat.verts_num = me->totvert;
   sys->heat.verts = verts;
   sys->heat.root = root;
@@ -1606,8 +1608,8 @@ static void harmonic_coordinates_bind(MeshDeformModifierData *mmd, MeshDeformBin
   /* initialize data from 'cagedm' for reuse */
   {
     Mesh *me = mdb->cagemesh;
-    mdb->cagemesh_cache.mpoly = me->mpoly;
-    mdb->cagemesh_cache.mloop = me->mloop;
+    mdb->cagemesh_cache.mpoly = BKE_mesh_polys(me);
+    mdb->cagemesh_cache.mloop = BKE_mesh_loops(me);
     mdb->cagemesh_cache.looptri = BKE_mesh_runtime_looptri_ensure(me);
     mdb->cagemesh_cache.poly_nors = BKE_mesh_poly_normals_ensure(me);
   }
@@ -1743,7 +1745,7 @@ void ED_mesh_deform_bind_callback(Object *object,
   MeshDeformModifierData *mmd_orig = (MeshDeformModifierData *)BKE_modifier_get_original(
       object, &mmd->modifier);
   MeshDeformBind mdb;
-  MVert *mvert;
+  const MVert *mvert;
   int a;
 
   waitcursor(1);
@@ -1763,7 +1765,7 @@ void ED_mesh_deform_bind_callback(Object *object,
   mdb.cagecos = MEM_callocN(sizeof(*mdb.cagecos) * mdb.cage_verts_num, "MeshDeformBindCos");
   copy_m4_m4(mdb.cagemat, cagemat);
 
-  mvert = mdb.cagemesh->mvert;
+  mvert = BKE_mesh_verts(mdb.cagemesh);
   for (a = 0; a < mdb.cage_verts_num; a++) {
     copy_v3_v3(mdb.cagecos[a], mvert[a].co);
   }
diff --git a/source/blender/editors/armature/pose_edit.c b/source/blender/editors/armature/pose_edit.c
index cec83ffa0f0..6a64c70493a 100644
--- a/source/blender/editors/armature/pose_edit.c
+++ b/source/blender/editors/armature/pose_edit.c
@@ -499,11 +499,12 @@ void POSE_OT_paths_range_update(wmOperatorType *ot)
 static int pose_flip_names_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   const bool do_strip_numbers = RNA_boolean_get(op->ptr, "do_strip_numbers");
 
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     bArmature *arm = ob->data;
     ListBase bones_names = {NULL};
 
@@ -856,9 +857,10 @@ static int pose_bone_layers_exec(bContext *C, wmOperator *op)
   struct Main *bmain = CTX_data_main(C);
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
 
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
     bArmature *arm = ob_iter->data;
     BKE_pose_ensure(bmain, ob_iter, arm, true);
   }
@@ -1001,9 +1003,11 @@ static int hide_pose_bone_fn(Object *ob, Bone *bone, void *ptr)
 /* active object is armature in posemode, poll checked */
 static int pose_hide_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   bool changed_multi = false;
 
   const int hide_select = !RNA_boolean_get(op->ptr, "unselected");
@@ -1066,9 +1070,11 @@ static int show_pose_bone_cb(Object *ob, Bone *bone, void *data)
 /* active object is armature in posemode, poll checked */
 static int pose_reveal_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   bool changed_multi = false;
   const bool select = RNA_boolean_get(op->ptr, "select");
   void *select_p = POINTER_FROM_INT(select);
@@ -1118,7 +1124,7 @@ static int pose_flip_quats_exec(bContext *C, wmOperator *UNUSED(op))
 
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
     bool changed = false;
     /* loop through all selected pchans, flipping and keying (as needed) */
     FOREACH_PCHAN_SELECTED_IN_OBJECT_BEGIN (ob_iter, pchan) {
diff --git a/source/blender/editors/armature/pose_lib.c b/source/blender/editors/armature/pose_lib.c
index b8e7c2624fd..ff187a52154 100644
--- a/source/blender/editors/armature/pose_lib.c
+++ b/source/blender/editors/armature/pose_lib.c
@@ -24,6 +24,7 @@
 #include "BKE_action.h"
 #include "BKE_animsys.h"
 #include "BKE_armature.h"
+#include "BKE_fcurve.h"
 #include "BKE_idprop.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
@@ -615,7 +616,8 @@ static int poselib_remove_exec(bContext *C, wmOperator *op)
       for (i = 0, bezt = fcu->bezt; i < fcu->totvert; i++, bezt++) {
         /* check if remove */
         if (IS_EQF(bezt->vec[1][0], (float)marker->frame)) {
-          delete_fcurve_key(fcu, i, 1);
+          BKE_fcurve_delete_key(fcu, i);
+          BKE_fcurve_handles_recalc(fcu);
           break;
         }
       }
@@ -1578,7 +1580,7 @@ static int poselib_preview_handle_event(bContext *UNUSED(C), wmOperator *op, con
     case EVT_PADMINUS:
       if (pld->searchstr[0]) {
         /* searching... */
-        poselib_preview_handle_search(pld, event->type, event->ascii);
+        poselib_preview_handle_search(pld, event->type, WM_event_utf8_to_ascii(event));
       }
       else {
         /* view manipulation (see above) */
@@ -1589,7 +1591,7 @@ static int poselib_preview_handle_event(bContext *UNUSED(C), wmOperator *op, con
 
     /* otherwise, assume that searching might be able to handle it */
     default:
-      poselib_preview_handle_search(pld, event->type, event->ascii);
+      poselib_preview_handle_search(pld, event->type, WM_event_utf8_to_ascii(event));
       break;
   }
 
diff --git a/source/blender/editors/armature/pose_select.c b/source/blender/editors/armature/pose_select.c
index b6b5d3ee495..6a31c7f1496 100644
--- a/source/blender/editors/armature/pose_select.c
+++ b/source/blender/editors/armature/pose_select.c
@@ -121,7 +121,8 @@ void ED_pose_bone_select(Object *ob, bPoseChannel *pchan, bool select)
   }
 }
 
-bool ED_armature_pose_select_pick_bone(ViewLayer *view_layer,
+bool ED_armature_pose_select_pick_bone(const Scene *scene,
+                                       ViewLayer *view_layer,
                                        View3D *v3d,
                                        Object *ob,
                                        Bone *bone,
@@ -144,7 +145,7 @@ bool ED_armature_pose_select_pick_bone(ViewLayer *view_layer,
       /* Deselect everything. */
       /* Don't use 'BKE_object_pose_base_array_get_unique'
        * because we may be selecting from object mode. */
-      FOREACH_VISIBLE_BASE_BEGIN (view_layer, v3d, base_iter) {
+      FOREACH_VISIBLE_BASE_BEGIN (scene, view_layer, v3d, base_iter) {
         Object *ob_iter = base_iter->object;
         if ((ob_iter->type == OB_ARMATURE) && (ob_iter->mode & OB_MODE_POSE)) {
           if (ED_pose_deselect_all(ob_iter, SEL_DESELECT, true)) {
@@ -158,15 +159,16 @@ bool ED_armature_pose_select_pick_bone(ViewLayer *view_layer,
   }
 
   if (found) {
-    Object *ob_act = OBACT(view_layer);
-    BLI_assert(OBEDIT_FROM_VIEW_LAYER(view_layer) == NULL);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob_act = BKE_view_layer_active_object_get(view_layer);
+    BLI_assert(BKE_view_layer_edit_object_get(view_layer) == NULL);
 
     /* If the bone cannot be affected, don't do anything. */
     bArmature *arm = ob->data;
 
     /* Since we do unified select, we don't shift+select a bone if the
      * armature object was not active yet.
-     * NOTE(campbell): special exception for armature mode so we can do multi-select
+     * NOTE(@campbellbarton): special exception for armature mode so we can do multi-select
      * we could check for multi-select explicitly but think its fine to
      * always give predictable behavior in weight paint mode. */
     if ((ob_act == NULL) || ((ob_act != ob) && (ob_act->mode & OB_MODE_ALL_WEIGHT_PAINT) == 0)) {
@@ -243,7 +245,8 @@ bool ED_armature_pose_select_pick_bone(ViewLayer *view_layer,
   return changed || found;
 }
 
-bool ED_armature_pose_select_pick_with_buffer(ViewLayer *view_layer,
+bool ED_armature_pose_select_pick_with_buffer(const Scene *scene,
+                                              ViewLayer *view_layer,
                                               View3D *v3d,
                                               Base *base,
                                               const struct GPUSelectResult *buffer,
@@ -263,13 +266,16 @@ bool ED_armature_pose_select_pick_with_buffer(ViewLayer *view_layer,
   nearBone = ED_armature_pick_bone_from_selectbuffer(
       &base, 1, buffer, hits, 1, do_nearest, &base_dummy);
 
-  return ED_armature_pose_select_pick_bone(view_layer, v3d, ob, nearBone, params);
+  return ED_armature_pose_select_pick_bone(scene, view_layer, v3d, ob, nearBone, params);
 }
 
-void ED_armature_pose_select_in_wpaint_mode(ViewLayer *view_layer, Base *base_select)
+void ED_armature_pose_select_in_wpaint_mode(const Scene *scene,
+                                            ViewLayer *view_layer,
+                                            Base *base_select)
 {
   BLI_assert(base_select && (base_select->object->type == OB_ARMATURE));
-  Object *ob_active = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob_active = BKE_view_layer_active_object_get(view_layer);
   BLI_assert(ob_active && (ob_active->mode & OB_MODE_ALL_WEIGHT_PAINT));
 
   if (ob_active->type == OB_GPENCIL) {
@@ -401,7 +407,8 @@ bool ED_pose_deselect_all_multi(bContext *C, int select_mode, const bool ignore_
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
 
-  Base **bases = BKE_object_pose_base_array_get_unique(vc.view_layer, vc.v3d, &bases_len);
+  Base **bases = BKE_object_pose_base_array_get_unique(
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = ED_pose_deselect_all_multi_ex(
       bases, bases_len, select_mode, ignore_visibility);
   MEM_freeN(bases);
@@ -844,6 +851,7 @@ typedef enum ePose_SelectSame_Mode {
 
 static bool pose_select_same_group(bContext *C, bool extend)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bool *group_flags_array;
   bool *group_flags = NULL;
@@ -853,7 +861,8 @@ static bool pose_select_same_group(bContext *C, bool extend)
   uint ob_index;
 
   uint objects_len = 0;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = BKE_object_pose_armature_get(objects[ob_index]);
@@ -947,6 +956,7 @@ static bool pose_select_same_group(bContext *C, bool extend)
 
 static bool pose_select_same_layer(bContext *C, bool extend)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int *layers_array, *layers = NULL;
   Object *ob_prev = NULL;
@@ -954,7 +964,8 @@ static bool pose_select_same_layer(bContext *C, bool extend)
   bool changed = false;
 
   uint objects_len = 0;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1032,6 +1043,7 @@ cleanup:
 
 static bool pose_select_same_keyingset(bContext *C, ReportList *reports, bool extend)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bool changed_multi = false;
   KeyingSet *ks = ANIM_scene_get_active_keyingset(CTX_data_scene(C));
@@ -1068,7 +1080,8 @@ static bool pose_select_same_keyingset(bContext *C, ReportList *reports, bool ex
   }
 
   uint objects_len = 0;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = BKE_object_pose_armature_get(objects[ob_index]);
@@ -1196,6 +1209,7 @@ void POSE_OT_select_grouped(wmOperatorType *ot)
  */
 static int pose_select_mirror_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_active = CTX_data_active_object(C);
 
@@ -1204,7 +1218,8 @@ static int pose_select_mirror_exec(bContext *C, wmOperator *op)
   const bool extend = RNA_boolean_get(op->ptr, "extend");
 
   uint objects_len = 0;
-  Object **objects = BKE_object_pose_array_get_unique(view_layer, CTX_wm_view3d(C), &objects_len);
+  Object **objects = BKE_object_pose_array_get_unique(
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
diff --git a/source/blender/editors/armature/pose_slide.c b/source/blender/editors/armature/pose_slide.c
index 38c99c2ef60..14b3451bd80 100644
--- a/source/blender/editors/armature/pose_slide.c
+++ b/source/blender/editors/armature/pose_slide.c
@@ -53,6 +53,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "WM_api.h"
@@ -231,8 +232,11 @@ static int pose_slide_init(bContext *C, wmOperator *op, ePoseSlide_Modes mode)
    * and set the relevant transform flags. */
   poseAnim_mapping_get(C, &pso->pfLinks);
 
-  Object **objects = BKE_view_layer_array_from_objects_in_mode_unique_data(
-      CTX_data_view_layer(C), CTX_wm_view3d(C), &pso->objects_len, OB_MODE_POSE);
+  Object **objects = BKE_view_layer_array_from_objects_in_mode_unique_data(CTX_data_scene(C),
+                                                                           CTX_data_view_layer(C),
+                                                                           CTX_wm_view3d(C),
+                                                                           &pso->objects_len,
+                                                                           OB_MODE_POSE);
   pso->ob_data_array = MEM_callocN(pso->objects_len * sizeof(tPoseSlideObject),
                                    "pose slide objects data");
 
@@ -285,8 +289,10 @@ static void pose_slide_exit(bContext *C, wmOperator *op)
   ED_slider_destroy(C, pso->slider);
 
   /* Hide Bone Overlay. */
-  View3D *v3d = pso->area->spacedata.first;
-  v3d->overlay.flag = pso->overlay_flag;
+  if (pso->area) {
+    View3D *v3d = pso->area->spacedata.first;
+    v3d->overlay.flag = pso->overlay_flag;
+  }
 
   /* Free the temp pchan links and their data. */
   poseAnim_mapping_free(&pso->pfLinks);
@@ -2078,7 +2084,7 @@ static int pose_propagate_exec(bContext *C, wmOperator *op)
   }
 
   /* Updates + notifiers. */
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     poseAnim_mapping_refresh(C, scene, ob);
   }
   FOREACH_OBJECT_IN_MODE_END;
diff --git a/source/blender/editors/armature/pose_transform.c b/source/blender/editors/armature/pose_transform.c
index cfc6b0b6b6e..2a23615caa3 100644
--- a/source/blender/editors/armature/pose_transform.c
+++ b/source/blender/editors/armature/pose_transform.c
@@ -491,13 +491,14 @@ void POSE_OT_armature_apply(wmOperatorType *ot)
 /* set the current pose as the restpose */
 static int pose_visual_transform_apply_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   /* Needed to ensure #bPoseChannel.pose_mat are up to date. */
   CTX_data_ensure_evaluated_depsgraph(C);
 
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     const bArmature *arm = ob->data;
 
     int chanbase_len = BLI_listbase_count(&ob->pose->chanbase);
@@ -1115,7 +1116,7 @@ static void pchan_clear_rot(bPoseChannel *pchan)
   }
 
   /* Clear also Bendy Bone stuff - Roll is obvious,
-   * but Curve X/Y stuff is also kindof rotational in nature... */
+   * but Curve X/Y stuff is also kind of rotational in nature... */
   pchan->roll1 = 0.0f;
   pchan->roll2 = 0.0f;
 
@@ -1168,7 +1169,7 @@ static int pose_clear_transform_generic_exec(bContext *C,
   /* only clear relevant transforms for selected bones */
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
     /* XXX: UGLY HACK (for auto-key + clear transforms). */
     Object *ob_eval = DEG_get_evaluated_object(depsgraph, ob_iter);
     ListBase dsources = {NULL, NULL};
@@ -1347,7 +1348,7 @@ static int pose_clear_user_transforms_exec(bContext *C, wmOperator *op)
       depsgraph, (float)scene->r.cfra);
   const bool only_select = RNA_boolean_get(op->ptr, "only_selected");
 
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     if ((ob->adt) && (ob->adt->action)) {
       /* XXX: this is just like this to avoid contaminating anything else;
        * just pose values should change, so this should be fine
diff --git a/source/blender/editors/armature/pose_utils.c b/source/blender/editors/armature/pose_utils.c
index 032e0ec077c..57ead6a0e65 100644
--- a/source/blender/editors/armature/pose_utils.c
+++ b/source/blender/editors/armature/pose_utils.c
@@ -26,6 +26,7 @@
 #include "DEG_depsgraph.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "WM_api.h"
@@ -250,7 +251,7 @@ void poseAnim_mapping_autoKeyframe(bContext *C, Scene *scene, ListBase *pfLinks,
   View3D *v3d = CTX_wm_view3d(C);
   bool skip = true;
 
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     ob->id.tag &= ~LIB_TAG_DOIT;
     ob = poseAnim_object_get(ob);
 
@@ -298,7 +299,7 @@ void poseAnim_mapping_autoKeyframe(bContext *C, Scene *scene, ListBase *pfLinks,
    * - only do this if keyframes should have been added
    * - do not calculate unless there are paths already to update...
    */
-  FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
+  FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob) {
     if (ob->id.tag & LIB_TAG_DOIT) {
       if (ob->pose->avs.path_bakeflag & MOTIONPATH_BAKE_HAS_PATHS) {
         // ED_pose_clear_paths(C, ob); /* XXX for now, don't need to clear. */
diff --git a/source/blender/editors/asset/ED_asset_handle.h b/source/blender/editors/asset/ED_asset_handle.h
index b408e919f32..4a81840c40d 100644
--- a/source/blender/editors/asset/ED_asset_handle.h
+++ b/source/blender/editors/asset/ED_asset_handle.h
@@ -35,3 +35,16 @@ void ED_asset_handle_get_full_library_path(const struct bContext *C,
 #ifdef __cplusplus
 }
 #endif
+
+#ifdef __cplusplus
+
+namespace blender::ed::asset {
+
+/** If the ID already exists in the database, return it, otherwise add it. */
+ID *get_local_id_from_asset_or_append_and_reuse(Main &bmain,
+                                                const AssetLibraryReference &library_ref,
+                                                AssetHandle asset);
+
+}  // namespace blender::ed::asset
+
+#endif
diff --git a/source/blender/editors/asset/ED_asset_list.h b/source/blender/editors/asset/ED_asset_list.h
index 2dc67fc4d37..b54f81004f2 100644
--- a/source/blender/editors/asset/ED_asset_list.h
+++ b/source/blender/editors/asset/ED_asset_list.h
@@ -24,7 +24,7 @@ struct wmNotifier;
 void ED_assetlist_storage_fetch(const struct AssetLibraryReference *library_reference,
                                 const struct bContext *C);
 void ED_assetlist_ensure_previews_job(const struct AssetLibraryReference *library_reference,
-                                      struct bContext *C);
+                                      const struct bContext *C);
 void ED_assetlist_clear(const struct AssetLibraryReference *library_reference, struct bContext *C);
 bool ED_assetlist_storage_has_list_for_library(const AssetLibraryReference *library_reference);
 /**
diff --git a/source/blender/editors/asset/intern/asset_handle.cc b/source/blender/editors/asset/intern/asset_handle.cc
index ade8b803ed3..00fffd595c0 100644
--- a/source/blender/editors/asset/intern/asset_handle.cc
+++ b/source/blender/editors/asset/intern/asset_handle.cc
@@ -13,6 +13,8 @@
 #include "ED_asset_handle.h"
 #include "ED_asset_list.hh"
 
+#include "WM_api.h"
+
 const char *ED_asset_handle_get_name(const AssetHandle *asset)
 {
   return asset->file_data->name;
@@ -52,3 +54,31 @@ void ED_asset_handle_get_full_library_path(const bContext *C,
 
   BLO_library_path_explode(asset_path.c_str(), r_full_lib_path, nullptr, nullptr);
 }
+
+namespace blender::ed::asset {
+
+ID *get_local_id_from_asset_or_append_and_reuse(Main &bmain,
+                                                const AssetLibraryReference &library_ref,
+                                                const AssetHandle asset)
+{
+  if (ID *local_id = ED_asset_handle_get_local_id(&asset)) {
+    return local_id;
+  }
+
+  char blend_path[FILE_MAX_LIBEXTRA];
+  ED_asset_handle_get_full_library_path(nullptr, &library_ref, &asset, blend_path);
+  const char *id_name = ED_asset_handle_get_name(&asset);
+
+  return WM_file_append_datablock(&bmain,
+                                  nullptr,
+                                  nullptr,
+                                  nullptr,
+                                  blend_path,
+                                  ED_asset_handle_get_id_type(&asset),
+                                  id_name,
+                                  BLO_LIBLINK_APPEND_RECURSIVE |
+                                      BLO_LIBLINK_APPEND_ASSET_DATA_CLEAR |
+                                      BLO_LIBLINK_APPEND_LOCAL_ID_REUSE);
+}
+
+}  // namespace blender::ed::asset
diff --git a/source/blender/editors/asset/intern/asset_indexer.cc b/source/blender/editors/asset/intern/asset_indexer.cc
index 3cc3638c299..cc06fa80429 100644
--- a/source/blender/editors/asset/intern/asset_indexer.cc
+++ b/source/blender/editors/asset/intern/asset_indexer.cc
@@ -351,7 +351,7 @@ static void init_indexer_entry_from_value(FileIndexerEntry &indexer_entry,
 {
   indexer_entry.idcode = entry.get_idcode();
 
-  const std::string &name = entry.get_name();
+  const std::string name = entry.get_name();
   BLI_strncpy(
       indexer_entry.datablock_info.name, name.c_str(), sizeof(indexer_entry.datablock_info.name));
 
@@ -359,19 +359,19 @@ static void init_indexer_entry_from_value(FileIndexerEntry &indexer_entry,
   indexer_entry.datablock_info.asset_data = asset_data;
 
   if (entry.has_description()) {
-    const std::string &description = entry.get_description();
-    char *description_c_str = static_cast<char *>(MEM_mallocN(description.length() + 1, __func__));
-    BLI_strncpy(description_c_str, description.c_str(), description.length() + 1);
+    const StringRefNull description = entry.get_description();
+    char *description_c_str = static_cast<char *>(MEM_mallocN(description.size() + 1, __func__));
+    BLI_strncpy(description_c_str, description.c_str(), description.size() + 1);
     asset_data->description = description_c_str;
   }
   if (entry.has_author()) {
-    const std::string &author = entry.get_author();
-    char *author_c_str = static_cast<char *>(MEM_mallocN(author.length() + 1, __func__));
-    BLI_strncpy(author_c_str, author.c_str(), author.length() + 1);
+    const StringRefNull author = entry.get_author();
+    char *author_c_str = static_cast<char *>(MEM_mallocN(author.size() + 1, __func__));
+    BLI_strncpy(author_c_str, author.c_str(), author.size() + 1);
     asset_data->author = author_c_str;
   }
 
-  const std::string &catalog_name = entry.get_catalog_name();
+  const StringRefNull catalog_name = entry.get_catalog_name();
   BLI_strncpy(asset_data->catalog_simple_name,
               catalog_name.c_str(),
               sizeof(asset_data->catalog_simple_name));
diff --git a/source/blender/editors/asset/intern/asset_library_reference_enum.cc b/source/blender/editors/asset/intern/asset_library_reference_enum.cc
index 67e253a4fcd..773838a54cd 100644
--- a/source/blender/editors/asset/intern/asset_library_reference_enum.cc
+++ b/source/blender/editors/asset/intern/asset_library_reference_enum.cc
@@ -97,10 +97,8 @@ const EnumPropertyItem *ED_asset_library_reference_to_rna_enum_itemf(
     RNA_enum_item_add_separator(&item, &totitem);
   }
 
-  int i = 0;
-  for (bUserAssetLibrary *user_library = (bUserAssetLibrary *)U.asset_libraries.first;
-       user_library;
-       user_library = user_library->next, i++) {
+  int i;
+  LISTBASE_FOREACH_INDEX (bUserAssetLibrary *, user_library, &U.asset_libraries, i) {
     /* Note that the path itself isn't checked for validity here. If an invalid library path is
      * used, the Asset Browser can give a nice hint on what's wrong. */
     const bool is_valid = (user_library->name[0] && user_library->path[0]);
diff --git a/source/blender/editors/asset/intern/asset_list.cc b/source/blender/editors/asset/intern/asset_list.cc
index 55167c1ed2d..b0ff5c86520 100644
--- a/source/blender/editors/asset/intern/asset_list.cc
+++ b/source/blender/editors/asset/intern/asset_list.cc
@@ -110,7 +110,7 @@ class AssetList : NonCopyable {
 
   void setup();
   void fetch(const bContext &C);
-  void ensurePreviewsJob(bContext *C);
+  void ensurePreviewsJob(const bContext *C);
   void clear(bContext *C);
 
   bool needsRefetch() const;
@@ -212,7 +212,7 @@ void AssetList::iterate(AssetListIterFn fn) const
   }
 }
 
-void AssetList::ensurePreviewsJob(bContext *C)
+void AssetList::ensurePreviewsJob(const bContext *C)
 {
   FileList *files = filelist_;
   int numfiles = filelist_files_ensure(files);
@@ -422,7 +422,8 @@ void ED_assetlist_storage_fetch(const AssetLibraryReference *library_reference,
   AssetListStorage::fetch_library(*library_reference, *C);
 }
 
-void ED_assetlist_ensure_previews_job(const AssetLibraryReference *library_reference, bContext *C)
+void ED_assetlist_ensure_previews_job(const AssetLibraryReference *library_reference,
+                                      const bContext *C)
 {
 
   AssetList *list = AssetListStorage::lookup_list(*library_reference);
diff --git a/source/blender/editors/asset/intern/asset_ops.cc b/source/blender/editors/asset/intern/asset_ops.cc
index 619a873909a..ba7b56db3ec 100644
--- a/source/blender/editors/asset/intern/asset_ops.cc
+++ b/source/blender/editors/asset/intern/asset_ops.cc
@@ -295,7 +295,7 @@ void AssetClearHelper::reportResults(const bContext *C, ReportList &reports) con
   else if (stats.tot_cleared == 1) {
     /* If only one data-block: Give more useful message by printing asset name. */
     BKE_reportf(
-        &reports, RPT_INFO, "Data-block '%s' is no asset anymore", stats.last_id->name + 2);
+        &reports, RPT_INFO, "Data-block '%s' is not an asset anymore", stats.last_id->name + 2);
   }
   else {
     BKE_reportf(&reports, RPT_INFO, "%i data-blocks are no assets anymore", stats.tot_cleared);
@@ -781,6 +781,7 @@ static const EnumPropertyItem *rna_asset_library_reference_itemf(bContext *UNUSE
   const EnumPropertyItem *items = ED_asset_library_reference_to_rna_enum_itemf(false);
   if (!items) {
     *r_free = false;
+    return nullptr;
   }
 
   *r_free = true;
diff --git a/source/blender/editors/curve/CMakeLists.txt b/source/blender/editors/curve/CMakeLists.txt
index 791e28de694..0cedc05981b 100644
--- a/source/blender/editors/curve/CMakeLists.txt
+++ b/source/blender/editors/curve/CMakeLists.txt
@@ -11,7 +11,6 @@ set(INC
   ../../makesrna
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   ../../../../extern/curve_fit_nd
   # RNA_prototypes.h
diff --git a/source/blender/editors/curve/editcurve.c b/source/blender/editors/curve/editcurve.c
index 24302aca59b..5e810d93115 100644
--- a/source/blender/editors/curve/editcurve.c
+++ b/source/blender/editors/curve/editcurve.c
@@ -47,7 +47,6 @@
 #include "ED_select_utils.h"
 #include "ED_transform.h"
 #include "ED_transform_snap_object_context.h"
-#include "ED_types.h"
 #include "ED_view3d.h"
 
 #include "curve_intern.h"
@@ -1255,7 +1254,7 @@ void ED_curve_editnurb_load(Main *bmain, Object *obedit)
     }
 
     /* We have to pass also new copied nurbs, since we want to restore original curve
-     * (without edited shapekey) on obdata, but *not* on editcurve itself
+     * (without edited shape-key) on obdata, but *not* on editcurve itself
      * (ED_curve_editnurb_load call does not always implies freeing
      * of editcurve, e.g. when called to generate render data). */
     calc_shapeKeys(obedit, &newnurb);
@@ -1279,7 +1278,7 @@ void ED_curve_editnurb_make(Object *obedit)
 
     if (actkey) {
       // XXX strcpy(G.editModeTitleExtra, "(Key) ");
-      /* TODO(campbell): undo_system: investigate why this was needed. */
+      /* TODO(@campbellbarton): undo_system: investigate why this was needed. */
 #if 0
       undo_editmode_clear();
 #endif
@@ -1299,15 +1298,15 @@ void ED_curve_editnurb_make(Object *obedit)
       BLI_addtail(&editnurb->nurbs, newnu);
     }
 
-    /* animation could be added in editmode even if there was no animdata in
-     * object mode hence we always need CVs index be created */
+    /* Animation could be added in edit-mode even if there was no animdata in
+     * object mode hence we always need CVs index be created. */
     init_editNurb_keyIndex(editnurb, &cu->nurb);
 
     if (actkey) {
       editnurb->shapenr = obedit->shapenr;
-      /* Apply shapekey to new nurbs of editnurb, not those of original curve
+      /* Apply shape-key to new nurbs of editnurb, not those of original curve
        * (and *after* we generated keyIndex), else we do not have valid 'original' data
-       * to properly restore curve when leaving editmode. */
+       * to properly restore curve when leaving edit-mode. */
       BKE_keyblock_convert_to_curve(actkey, cu, &editnurb->nurbs);
     }
   }
@@ -1344,7 +1343,7 @@ static int separate_exec(bContext *C, wmOperator *op)
 
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
   for (uint b_index = 0; b_index < bases_len; b_index++) {
     Base *oldbase = bases[b_index];
     Base *newbase;
@@ -1469,6 +1468,7 @@ void CURVE_OT_separate(wmOperatorType *ot)
 static int curve_split_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   bool changed = false;
@@ -1476,7 +1476,7 @@ static int curve_split_exec(bContext *C, wmOperator *op)
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -1541,67 +1541,6 @@ void CURVE_OT_split(wmOperatorType *ot)
 /** \name Flag Utility Functions
  * \{ */
 
-static bool isNurbselUV(const Nurb *nu, uint8_t flag, int *r_u, int *r_v)
-{
-  /* return (u != -1): 1 row in u-direction selected. U has value between 0-pntsv
-   * return (v != -1): 1 column in v-direction selected. V has value between 0-pntsu
-   */
-  BPoint *bp;
-  int a, b, sel;
-
-  *r_u = *r_v = -1;
-
-  bp = nu->bp;
-  for (b = 0; b < nu->pntsv; b++) {
-    sel = 0;
-    for (a = 0; a < nu->pntsu; a++, bp++) {
-      if (bp->f1 & flag) {
-        sel++;
-      }
-    }
-    if (sel == nu->pntsu) {
-      if (*r_u == -1) {
-        *r_u = b;
-      }
-      else {
-        return 0;
-      }
-    }
-    else if (sel > 1) {
-      return 0; /* because sel == 1 is still ok */
-    }
-  }
-
-  for (a = 0; a < nu->pntsu; a++) {
-    sel = 0;
-    bp = &nu->bp[a];
-    for (b = 0; b < nu->pntsv; b++, bp += nu->pntsu) {
-      if (bp->f1 & flag) {
-        sel++;
-      }
-    }
-    if (sel == nu->pntsv) {
-      if (*r_v == -1) {
-        *r_v = a;
-      }
-      else {
-        return 0;
-      }
-    }
-    else if (sel > 1) {
-      return 0;
-    }
-  }
-
-  if (*r_u == -1 && *r_v > -1) {
-    return 1;
-  }
-  if (*r_v == -1 && *r_u > -1) {
-    return 1;
-  }
-  return 0;
-}
-
 /* return true if U direction is selected and number of selected columns v */
 static bool isNurbselU(Nurb *nu, int *v, int flag)
 {
@@ -1976,119 +1915,201 @@ static void ed_curve_delete_selected(Object *obedit, View3D *v3d)
   }
 }
 
-bool ed_editnurb_extrude_flag(EditNurb *editnurb, const uint8_t flag)
+static void select_bpoints(BPoint *bp,
+                           const int stride,
+                           const int count,
+                           const bool selstatus,
+                           const uint8_t flag,
+                           const bool hidden)
 {
-  BPoint *bp, *bpn, *newbp;
-  int a, u, v, len;
-  bool ok = false;
+  for (int i = 0; i < count; i++) {
+    select_bpoint(bp, selstatus, flag, hidden);
+    bp += stride;
+  }
+}
 
-  LISTBASE_FOREACH (Nurb *, nu, &editnurb->nurbs) {
-    if (nu->pntsv == 1) {
-      bp = nu->bp;
-      a = nu->pntsu;
-      while (a) {
-        if (bp->f1 & flag) {
-          /* pass */
-        }
-        else {
-          break;
-        }
-        bp++;
-        a--;
-      }
-      if (a == 0) {
-        ok = true;
-        newbp = (BPoint *)MEM_mallocN(2 * nu->pntsu * sizeof(BPoint), "extrudeNurb1");
-        ED_curve_bpcpy(editnurb, newbp, nu->bp, nu->pntsu);
-        bp = newbp + nu->pntsu;
-        ED_curve_bpcpy(editnurb, bp, nu->bp, nu->pntsu);
-        MEM_freeN(nu->bp);
-        nu->bp = newbp;
-        a = nu->pntsu;
-        while (a--) {
-          select_bpoint(bp, SELECT, flag, HIDDEN);
-          select_bpoint(newbp, DESELECT, flag, HIDDEN);
-          bp++;
-          newbp++;
-        }
+/**
+ * Calculate and return fully selected legs along i dimension.
+ * Calculates intervals to create extrusion by duplicating existing points while copied to
+ * destination NURBS. For ex. for curve of 3 points indexed by 0..2  to extrude first and last
+ * point copy intervals would be [0, 0][0, 2][2, 2]. Representation in copy_intervals array would
+ * be [0, 0, 2, 2]. Returns -1 if selection is not valid.
+ */
+static int sel_to_copy_ints(const BPoint *bp,
+                            const int next_j,
+                            const int max_j,
+                            const int next_i,
+                            const int max_i,
+                            const uint8_t flag,
+                            int copy_intervals[],
+                            int *interval_count,
+                            bool *out_is_first_sel)
+{
+  const BPoint *bp_j = bp;
 
-        nu->pntsv = 2;
-        nu->orderv = 2;
-        BKE_nurb_knot_calc_v(nu);
-      }
-    }
-    else {
-      /* which row or column is selected */
+  int selected_leg_count = 0;
+  int ins = 0;
+  int selected_in_prev_leg = -1;
+  int not_full = -1;
 
-      if (isNurbselUV(nu, flag, &u, &v)) {
+  bool is_first_sel = false;
+  bool is_last_sel = false;
 
-        /* deselect all */
-        bp = nu->bp;
-        a = nu->pntsu * nu->pntsv;
-        while (a--) {
-          select_bpoint(bp, DESELECT, flag, HIDDEN);
-          bp++;
-        }
+  for (int j = 0; j < max_j; j++, bp_j += next_j) {
+    const BPoint *bp_j_i = bp_j;
+    int selected_in_curr_leg = 0;
+    for (int i = 0; i < max_i; i++, bp_j_i += next_i) {
+      if (bp_j_i->f1 & flag) {
+        selected_in_curr_leg++;
+      }
+    }
+    if (selected_in_curr_leg == max_i) {
+      selected_leg_count++;
+      if (j == 0) {
+        is_first_sel = true;
+      }
+      else if (j + 1 == max_j) {
+        is_last_sel = true;
+      }
+    }
+    else if (not_full == -1) {
+      not_full = selected_in_curr_leg;
+    }
+    /* We have partially selected leg in opposite dimension if condition is met. */
+    else if (not_full != selected_in_curr_leg) {
+      return -1;
+    }
+    /* Extrusion area starts/ends if met. */
+    if (selected_in_prev_leg != selected_in_curr_leg) {
+      copy_intervals[ins] = selected_in_curr_leg == max_i || j == 0 ? j : j - 1;
+      ins++;
+      selected_in_prev_leg = selected_in_curr_leg;
+    }
+    copy_intervals[ins] = j;
+  }
+  if (selected_leg_count &&
+      /* Prevents leading and trailing unselected legs if all selected.
+       * Unless it is extrusion from point or curve. */
+      (selected_leg_count < max_j || max_j == 1)) {
+    /* Prepend unselected leg if more than one leg selected at the starting edge.
+     * max_j == 1 handles extrusion from point to curve and from curve to surface cases. */
+    if (is_first_sel && (copy_intervals[0] < copy_intervals[1] || max_j == 1)) {
+      memmove(copy_intervals + 1, copy_intervals, (ins + 1) * sizeof(copy_intervals[0]));
+      copy_intervals[0] = 0;
+      ins++;
+      is_first_sel = false;
+    }
+    /* Append unselected leg if more than one leg selected at the end. */
+    if (is_last_sel && copy_intervals[ins - 1] < copy_intervals[ins]) {
+      copy_intervals[ins + 1] = copy_intervals[ins];
+      ins++;
+    }
+  }
+  *interval_count = ins;
+  *out_is_first_sel = ins > 1 ? is_first_sel : false;
+  return selected_leg_count;
+}
 
-        if (ELEM(u, 0, nu->pntsv - 1)) { /* row in u-direction selected */
-          ok = true;
-          newbp = (BPoint *)MEM_mallocN(nu->pntsu * (nu->pntsv + 1) * sizeof(BPoint),
-                                        "extrudeNurb1");
-          if (u == 0) {
-            len = nu->pntsv * nu->pntsu;
-            ED_curve_bpcpy(editnurb, newbp + nu->pntsu, nu->bp, len);
-            ED_curve_bpcpy(editnurb, newbp, nu->bp, nu->pntsu);
-            bp = newbp;
-          }
-          else {
-            len = nu->pntsv * nu->pntsu;
-            ED_curve_bpcpy(editnurb, newbp, nu->bp, len);
-            ED_curve_bpcpy(editnurb, newbp + len, &nu->bp[len - nu->pntsu], nu->pntsu);
-            bp = newbp + len;
-          }
+typedef struct NurbDim {
+  int pntsu;
+  int pntsv;
+} NurbDim;
 
-          a = nu->pntsu;
-          while (a--) {
-            select_bpoint(bp, SELECT, flag, HIDDEN);
-            bp++;
-          }
+static NurbDim editnurb_find_max_points_num(const EditNurb *editnurb)
+{
+  NurbDim ret = {0, 0};
+  LISTBASE_FOREACH (Nurb *, nu, &editnurb->nurbs) {
+    if (nu->pntsu > ret.pntsu) {
+      ret.pntsu = nu->pntsu;
+    }
+    if (nu->pntsv > ret.pntsv) {
+      ret.pntsv = nu->pntsv;
+    }
+  }
+  return ret;
+}
 
-          MEM_freeN(nu->bp);
-          nu->bp = newbp;
-          nu->pntsv++;
-          BKE_nurb_knot_calc_v(nu);
-        }
-        else if (ELEM(v, 0, nu->pntsu - 1)) { /* column in v-direction selected */
-          ok = true;
-          bpn = newbp = (BPoint *)MEM_mallocN((nu->pntsu + 1) * nu->pntsv * sizeof(BPoint),
-                                              "extrudeNurb1");
-          bp = nu->bp;
+bool ed_editnurb_extrude_flag(EditNurb *editnurb, const uint8_t flag)
+{
+  const NurbDim max = editnurb_find_max_points_num(editnurb);
+  /* One point induces at most one interval. Except single point case, it can give + 1.
+   * Another +1 is for first element of the first interval. */
+  int *const intvls_u = MEM_malloc_arrayN(max.pntsu + 2, sizeof(int), "extrudeNurb0");
+  int *const intvls_v = MEM_malloc_arrayN(max.pntsv + 2, sizeof(int), "extrudeNurb1");
+  bool ok = false;
 
-          for (a = 0; a < nu->pntsv; a++) {
-            if (v == 0) {
-              *bpn = *bp;
-              bpn->f1 |= flag;
-              bpn++;
-            }
-            ED_curve_bpcpy(editnurb, bpn, bp, nu->pntsu);
-            bp += nu->pntsu;
-            bpn += nu->pntsu;
-            if (v == nu->pntsu - 1) {
-              *bpn = *(bp - 1);
-              bpn->f1 |= flag;
-              bpn++;
-            }
-          }
+  LISTBASE_FOREACH (Nurb *, nu, &editnurb->nurbs) {
+    int intvl_cnt_u;
+    bool is_first_sel_u;
 
-          MEM_freeN(nu->bp);
-          nu->bp = newbp;
-          nu->pntsu++;
-          BKE_nurb_knot_calc_u(nu);
-        }
-      }
+    /* Calculate selected U legs and intervals for their extrusion. */
+    const int selected_us = sel_to_copy_ints(
+        nu->bp, 1, nu->pntsu, nu->pntsu, nu->pntsv, flag, intvls_u, &intvl_cnt_u, &is_first_sel_u);
+    if (selected_us == -1) {
+      continue;
     }
-  }
+    int intvl_cnt_v;
+    bool is_first_sel_v;
 
+    const bool is_point = nu->pntsu == 1;
+    const bool is_curve = nu->pntsv == 1;
+    const bool extrude_every_u_point = selected_us == nu->pntsu;
+    if (is_point || (is_curve && !extrude_every_u_point)) {
+      intvls_v[0] = intvls_v[1] = 0;
+      intvl_cnt_v = 1;
+      is_first_sel_v = false;
+    }
+    else {
+      sel_to_copy_ints(nu->bp,
+                       nu->pntsu,
+                       nu->pntsv,
+                       1,
+                       nu->pntsu,
+                       flag,
+                       intvls_v,
+                       &intvl_cnt_v,
+                       &is_first_sel_v);
+    }
+
+    const int new_pntsu = nu->pntsu + intvl_cnt_u - 1;
+    const int new_pntsv = nu->pntsv + intvl_cnt_v - 1;
+    BPoint *const new_bp = (BPoint *)MEM_malloc_arrayN(
+        new_pntsu * new_pntsv, sizeof(BPoint), "extrudeNurb2");
+    BPoint *new_bp_v = new_bp;
+
+    bool selected_v = is_first_sel_v;
+    for (int j = 1; j <= intvl_cnt_v; j++, selected_v = !selected_v) {
+      BPoint *old_bp_v = nu->bp + intvls_v[j - 1] * nu->pntsu;
+      for (int v_j = intvls_v[j - 1]; v_j <= intvls_v[j];
+           v_j++, new_bp_v += new_pntsu, old_bp_v += nu->pntsu) {
+        BPoint *new_bp_u_v = new_bp_v;
+        bool selected_u = is_first_sel_u;
+        for (int i = 1; i <= intvl_cnt_u; i++, selected_u = !selected_u) {
+          const int copy_from = intvls_u[i - 1];
+          const int copy_to = intvls_u[i];
+          const int copy_count = copy_to - copy_from + 1;
+          const bool sel_status = selected_u || selected_v ? true : false;
+          ED_curve_bpcpy(editnurb, new_bp_u_v, old_bp_v + copy_from, copy_count);
+          select_bpoints(new_bp_u_v, 1, copy_count, sel_status, flag, HIDDEN);
+          new_bp_u_v += copy_count;
+        }
+      }
+    }
+
+    MEM_freeN(nu->bp);
+    nu->bp = new_bp;
+    nu->pntsu = new_pntsu;
+    if (nu->pntsv == 1 && new_pntsv > 1) {
+      nu->orderv = 2;
+    }
+    nu->pntsv = new_pntsv;
+    BKE_nurb_knot_calc_u(nu);
+    BKE_nurb_knot_calc_v(nu);
+
+    ok = true;
+  }
+  MEM_freeN(intvls_u);
+  MEM_freeN(intvls_v);
   return ok;
 }
 
@@ -2133,7 +2154,7 @@ static void adduplicateflagNurb(
         starta = a;
         while ((bezt->f1 & flag) || (bezt->f2 & flag) || (bezt->f3 & flag)) {
           if (!split) {
-            select_beztriple(bezt, DESELECT, flag, HIDDEN);
+            select_beztriple(bezt, false, flag, HIDDEN);
           }
           enda = a;
           if (a >= nu->pntsu - 1) {
@@ -2173,7 +2194,7 @@ static void adduplicateflagNurb(
             }
 
             for (b = 0, bezt1 = newnu->bezt; b < newnu->pntsu; b++, bezt1++) {
-              select_beztriple(bezt1, SELECT, flag, HIDDEN);
+              select_beztriple(bezt1, true, flag, HIDDEN);
             }
 
             BLI_addtail(newnurb, newnu);
@@ -2191,7 +2212,7 @@ static void adduplicateflagNurb(
         newnu->flagu &= ~CU_NURB_CYCLIC;
 
         for (b = 0, bezt1 = newnu->bezt; b < newnu->pntsu; b++, bezt1++) {
-          select_beztriple(bezt1, SELECT, flag, HIDDEN);
+          select_beztriple(bezt1, true, flag, HIDDEN);
         }
 
         BLI_addtail(newnurb, newnu);
@@ -2203,7 +2224,7 @@ static void adduplicateflagNurb(
         starta = a;
         while (bp->f1 & flag) {
           if (!split) {
-            select_bpoint(bp, DESELECT, flag, HIDDEN);
+            select_bpoint(bp, false, flag, HIDDEN);
           }
           enda = a;
           if (a >= nu->pntsu - 1) {
@@ -2243,7 +2264,7 @@ static void adduplicateflagNurb(
             }
 
             for (b = 0, bp1 = newnu->bp; b < newnu->pntsu; b++, bp1++) {
-              select_bpoint(bp1, SELECT, flag, HIDDEN);
+              select_bpoint(bp1, true, flag, HIDDEN);
             }
 
             BLI_addtail(newnurb, newnu);
@@ -2261,7 +2282,7 @@ static void adduplicateflagNurb(
         newnu->flagu &= ~CU_NURB_CYCLIC;
 
         for (b = 0, bp1 = newnu->bp; b < newnu->pntsu; b++, bp1++) {
-          select_bpoint(bp1, SELECT, flag, HIDDEN);
+          select_bpoint(bp1, true, flag, HIDDEN);
         }
 
         BLI_addtail(newnurb, newnu);
@@ -2481,7 +2502,7 @@ static void adduplicateflagNurb(
           for (b = 0, bp1 = nu->bp; b < nu->pntsu * nu->pntsv; b++, bp1++) {
             bp1->f1 &= ~SURF_SEEN;
             if (!split) {
-              select_bpoint(bp1, DESELECT, flag, HIDDEN);
+              select_bpoint(bp1, false, flag, HIDDEN);
             }
           }
         }
@@ -2525,12 +2546,13 @@ static void adduplicateflagNurb(
 static int switch_direction_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -2586,10 +2608,11 @@ void CURVE_OT_switch_direction(wmOperatorType *ot)
 
 static int set_goal_weight_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -2652,10 +2675,11 @@ void CURVE_OT_spline_weight_set(wmOperatorType *ot)
 
 static int set_radius_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -2763,10 +2787,11 @@ static void smooth_single_bp(BPoint *bp,
 static int smooth_exec(bContext *C, wmOperator *UNUSED(op))
 {
   const float factor = 1.0f / 6.0f;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3059,10 +3084,11 @@ static void curve_smooth_value(ListBase *editnurb, const int bezt_offsetof, cons
 
 static int curve_smooth_weight_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3102,10 +3128,11 @@ void CURVE_OT_smooth_weight(wmOperatorType *ot)
 
 static int curve_smooth_radius_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3145,10 +3172,11 @@ void CURVE_OT_smooth_radius(wmOperatorType *ot)
 
 static int curve_smooth_tilt_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3188,6 +3216,7 @@ void CURVE_OT_smooth_tilt(wmOperatorType *ot)
 
 static int hide_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
@@ -3195,7 +3224,7 @@ static int hide_exec(bContext *C, wmOperator *op)
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -3216,11 +3245,11 @@ static int hide_exec(bContext *C, wmOperator *op)
         sel = 0;
         while (a--) {
           if (invert == 0 && BEZT_ISSEL_ANY_HIDDENHANDLES(v3d, bezt)) {
-            select_beztriple(bezt, DESELECT, SELECT, HIDDEN);
+            select_beztriple(bezt, false, SELECT, HIDDEN);
             bezt->hide = 1;
           }
           else if (invert && !BEZT_ISSEL_ANY_HIDDENHANDLES(v3d, bezt)) {
-            select_beztriple(bezt, DESELECT, SELECT, HIDDEN);
+            select_beztriple(bezt, false, SELECT, HIDDEN);
             bezt->hide = 1;
           }
           if (bezt->hide) {
@@ -3238,11 +3267,11 @@ static int hide_exec(bContext *C, wmOperator *op)
         sel = 0;
         while (a--) {
           if (invert == 0 && (bp->f1 & SELECT)) {
-            select_bpoint(bp, DESELECT, SELECT, HIDDEN);
+            select_bpoint(bp, false, SELECT, HIDDEN);
             bp->hide = 1;
           }
           else if (invert && (bp->f1 & SELECT) == 0) {
-            select_bpoint(bp, DESELECT, SELECT, HIDDEN);
+            select_bpoint(bp, false, SELECT, HIDDEN);
             bp->hide = 1;
           }
           if (bp->hide) {
@@ -3290,13 +3319,14 @@ void CURVE_OT_hide(wmOperatorType *ot)
 
 static int reveal_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool select = RNA_boolean_get(op->ptr, "select");
   bool changed_multi = false;
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     ListBase *editnurb = object_editcurve_get(obedit);
@@ -3769,12 +3799,13 @@ static int subdivide_exec(bContext *C, wmOperator *op)
   const int number_cuts = RNA_int_get(op->ptr, "number_cuts");
 
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -3827,10 +3858,11 @@ void CURVE_OT_subdivide(wmOperatorType *ot)
 
 static int set_spline_type_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   int ret_value = OPERATOR_CANCELLED;
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -3920,13 +3952,14 @@ void CURVE_OT_spline_type_set(wmOperatorType *ot)
 
 static int set_handle_type_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   const int handle_type = RNA_enum_get(op->ptr, "type");
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -3982,6 +4015,7 @@ void CURVE_OT_handle_type_set(wmOperatorType *ot)
 
 static int curve_normals_make_consistent_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
@@ -3989,7 +4023,7 @@ static int curve_normals_make_consistent_exec(bContext *C, wmOperator *op)
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -4332,7 +4366,7 @@ static bool merge_2_nurb(Curve *cu, ListBase *editnurb, Nurb *nu1, Nurb *nu2)
         keyIndex_updateBP(cu->editnurb, bp1, bp, 1);
         *bp = *bp1;
         bp1++;
-        select_bpoint(bp, SELECT, SELECT, HIDDEN);
+        select_bpoint(bp, true, SELECT, HIDDEN);
       }
       else {
         keyIndex_updateBP(cu->editnurb, bp2, bp, 1);
@@ -4422,6 +4456,7 @@ static int merge_nurb(View3D *v3d, Object *obedit)
 static int make_segment_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
@@ -4435,7 +4470,7 @@ static int make_segment_exec(bContext *C, wmOperator *op)
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -4759,7 +4794,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
       /* Deselect everything. */
       uint objects_len = 0;
       Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-          vc.view_layer, vc.v3d, &objects_len);
+          vc.scene, vc.view_layer, vc.v3d, &objects_len);
       for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
         Object *ob_iter = objects[ob_index];
 
@@ -4787,7 +4822,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
               bezt->f2 |= SELECT;
             }
             else {
-              select_beztriple(bezt, SELECT, SELECT, HIDDEN);
+              select_beztriple(bezt, true, SELECT, HIDDEN);
             }
           }
           else {
@@ -4801,7 +4836,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
           BKE_curve_nurb_vert_active_set(cu, nu, bezt);
         }
         else {
-          select_bpoint(bp, SELECT, SELECT, HIDDEN);
+          select_bpoint(bp, true, SELECT, HIDDEN);
           BKE_curve_nurb_vert_active_set(cu, nu, bp);
         }
         break;
@@ -4813,7 +4848,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
               bezt->f2 &= ~SELECT;
             }
             else {
-              select_beztriple(bezt, DESELECT, SELECT, HIDDEN);
+              select_beztriple(bezt, false, SELECT, HIDDEN);
             }
             if (bezt == vert) {
               cu->actvert = CU_ACT_NONE;
@@ -4827,7 +4862,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
           }
         }
         else {
-          select_bpoint(bp, DESELECT, SELECT, HIDDEN);
+          select_bpoint(bp, false, SELECT, HIDDEN);
           if (bp == vert) {
             cu->actvert = CU_ACT_NONE;
           }
@@ -4842,7 +4877,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
                 bezt->f2 &= ~SELECT;
               }
               else {
-                select_beztriple(bezt, DESELECT, SELECT, HIDDEN);
+                select_beztriple(bezt, false, SELECT, HIDDEN);
               }
               if (bezt == vert) {
                 cu->actvert = CU_ACT_NONE;
@@ -4853,7 +4888,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
                 bezt->f2 |= SELECT;
               }
               else {
-                select_beztriple(bezt, SELECT, SELECT, HIDDEN);
+                select_beztriple(bezt, true, SELECT, HIDDEN);
               }
               BKE_curve_nurb_vert_active_set(cu, nu, bezt);
             }
@@ -4867,13 +4902,13 @@ bool ED_curve_editnurb_select_pick(bContext *C,
         }
         else {
           if (bp->f1 & SELECT) {
-            select_bpoint(bp, DESELECT, SELECT, HIDDEN);
+            select_bpoint(bp, false, SELECT, HIDDEN);
             if (bp == vert) {
               cu->actvert = CU_ACT_NONE;
             }
           }
           else {
-            select_bpoint(bp, SELECT, SELECT, HIDDEN);
+            select_bpoint(bp, true, SELECT, HIDDEN);
             BKE_curve_nurb_vert_active_set(cu, nu, bp);
           }
         }
@@ -4889,7 +4924,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
               bezt->f2 |= SELECT;
             }
             else {
-              select_beztriple(bezt, SELECT, SELECT, HIDDEN);
+              select_beztriple(bezt, true, SELECT, HIDDEN);
             }
           }
           else {
@@ -4903,7 +4938,7 @@ bool ED_curve_editnurb_select_pick(bContext *C,
           BKE_curve_nurb_vert_active_set(cu, nu, bezt);
         }
         else {
-          select_bpoint(bp, SELECT, SELECT, HIDDEN);
+          select_bpoint(bp, true, SELECT, HIDDEN);
           BKE_curve_nurb_vert_active_set(cu, nu, bp);
         }
         break;
@@ -4925,7 +4960,8 @@ bool ED_curve_editnurb_select_pick(bContext *C,
       WM_event_add_notifier(C, NC_MATERIAL | ND_SHADING_LINKS, NULL);
     }
 
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
@@ -5026,6 +5062,7 @@ bool ed_editnurb_spin(
 static int spin_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   RegionView3D *rv3d = ED_view3d_context_rv3d(C);
@@ -5045,7 +5082,7 @@ static int spin_exec(bContext *C, wmOperator *op)
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = (Curve *)obedit->data;
@@ -5684,34 +5721,24 @@ void CURVE_OT_vertex_add(wmOperatorType *ot)
 static int curve_extrude_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
     EditNurb *editnurb = cu->editnurb;
     bool changed = false;
-    bool as_curve = false;
 
     if (!ED_curve_select_check(v3d, cu->editnurb)) {
       continue;
     }
 
-    /* First test: curve? */
-    if (obedit->type != OB_CURVES_LEGACY) {
-      LISTBASE_FOREACH (Nurb *, nu, &editnurb->nurbs) {
-        if ((nu->pntsv == 1) && (ED_curve_nurb_select_count(v3d, nu) < nu->pntsu)) {
-          as_curve = true;
-          break;
-        }
-      }
-    }
-
-    if (obedit->type == OB_CURVES_LEGACY || as_curve) {
+    if (obedit->type == OB_CURVES_LEGACY) {
       changed = ed_editcurve_extrude(cu, editnurb, v3d);
     }
     else {
@@ -5837,12 +5864,13 @@ static int toggle_cyclic_exec(bContext *C, wmOperator *op)
 {
   const int direction = RNA_enum_get(op->ptr, "direction");
   View3D *v3d = CTX_wm_view3d(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bool changed_multi = false;
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -5925,6 +5953,7 @@ void CURVE_OT_cyclic_toggle(wmOperatorType *ot)
 
 static int duplicate_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
@@ -5933,7 +5962,7 @@ static int duplicate_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -6397,7 +6426,7 @@ static bool curve_delete_segments(Object *obedit, View3D *v3d, const bool split)
       if (split) {
         /* deselect for split operator */
         for (b = 0, bezt1 = nu->bezt; b < nu->pntsu; b++, bezt1++) {
-          select_beztriple(bezt1, DESELECT, SELECT, true);
+          select_beztriple(bezt1, false, SELECT, true);
         }
       }
 
@@ -6407,7 +6436,7 @@ static bool curve_delete_segments(Object *obedit, View3D *v3d, const bool split)
       if (split) {
         /* deselect for split operator */
         for (b = 0, bp1 = nu->bp; b < nu->pntsu * nu->pntsv; b++, bp1++) {
-          select_bpoint(bp1, DESELECT, SELECT, HIDDEN);
+          select_bpoint(bp1, false, SELECT, HIDDEN);
         }
       }
 
@@ -6433,10 +6462,11 @@ static int curve_delete_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   View3D *v3d = CTX_wm_view3d(C);
   eCurveElem_Types type = RNA_enum_get(op->ptr, "type");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   bool changed_multi = false;
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -6609,12 +6639,13 @@ void ed_dissolve_bez_segment(BezTriple *bezt_prev,
 static int curve_dissolve_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = (Curve *)obedit->data;
@@ -6703,10 +6734,11 @@ static int curve_decimate_exec(bContext *C, wmOperator *op)
   float ratio = RNA_float_get(op->ptr, "ratio");
   bool all_supported_multi = true;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = (Curve *)obedit->data;
@@ -6783,11 +6815,12 @@ void CURVE_OT_decimate(wmOperatorType *ot)
 static int shade_smooth_exec(bContext *C, wmOperator *op)
 {
   View3D *v3d = CTX_wm_view3d(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int clear = (STREQ(op->idname, "CURVE_OT_shade_flat"));
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   int ret_value = OPERATOR_CANCELLED;
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -6977,12 +7010,13 @@ int ED_curve_join_objects_exec(bContext *C, wmOperator *op)
 
 static int clear_tilt_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
diff --git a/source/blender/editors/curve/editcurve_add.c b/source/blender/editors/curve/editcurve_add.c
index ba5a7409ba7..f2cc48049d7 100644
--- a/source/blender/editors/curve/editcurve_add.c
+++ b/source/blender/editors/curve/editcurve_add.c
@@ -18,6 +18,7 @@
 
 #include "BKE_context.h"
 #include "BKE_curve.h"
+#include "BKE_layer.h"
 
 #include "DEG_depsgraph.h"
 
@@ -87,6 +88,8 @@ static const char *get_surf_defname(int type)
       return CTX_DATA_(BLT_I18NCONTEXT_ID_CURVE_LEGACY, "SurfCircle");
     case CU_PRIM_PATCH:
       return CTX_DATA_(BLT_I18NCONTEXT_ID_CURVE_LEGACY, "SurfPatch");
+    case CU_PRIM_TUBE:
+      return CTX_DATA_(BLT_I18NCONTEXT_ID_CURVE_LEGACY, "SurfCylinder");
     case CU_PRIM_SPHERE:
       return CTX_DATA_(BLT_I18NCONTEXT_ID_CURVE_LEGACY, "SurfSphere");
     case CU_PRIM_DONUT:
@@ -493,7 +496,8 @@ static int curvesurf_prim_add(bContext *C, wmOperator *op, int type, int isSurf)
   struct Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   ListBase *editnurb;
   Nurb *nu;
   bool newob = false;
diff --git a/source/blender/editors/curve/editcurve_paint.c b/source/blender/editors/curve/editcurve_paint.c
index 6946c09e6f1..7632f1b1e64 100644
--- a/source/blender/editors/curve/editcurve_paint.c
+++ b/source/blender/editors/curve/editcurve_paint.c
@@ -1162,7 +1162,7 @@ static int curve_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
       curve_draw_event_add_first(op, event);
     }
   }
-  else if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  else if (ISMOUSE_MOTION(event->type)) {
     if (cdd->state == CURVE_DRAW_PAINTING) {
       const float mval_fl[2] = {UNPACK2(event->mval)};
       if (len_squared_v2v2(mval_fl, cdd->prev.mval) > square_f(STROKE_SAMPLE_DIST_MIN_PX)) {
diff --git a/source/blender/editors/curve/editcurve_pen.c b/source/blender/editors/curve/editcurve_pen.c
index 729ad46877a..395053d6b1b 100644
--- a/source/blender/editors/curve/editcurve_pen.c
+++ b/source/blender/editors/curve/editcurve_pen.c
@@ -1532,7 +1532,7 @@ wmKeyMap *curve_pen_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Curve Pen Modal Map");
 
-  /* This function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return NULL;
   }
@@ -1622,7 +1622,7 @@ static int curve_pen_modal(bContext *C, wmOperator *op, const wmEvent *event)
     }
   }
 
-  if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  if (ISMOUSE_MOTION(event->type)) {
     /* Check if dragging */
     if (!cpd->dragging && WM_event_drag_test(event, event->prev_press_xy)) {
       cpd->dragging = true;
diff --git a/source/blender/editors/curve/editcurve_query.c b/source/blender/editors/curve/editcurve_query.c
index a08dbbe6132..56268baf1f1 100644
--- a/source/blender/editors/curve/editcurve_query.c
+++ b/source/blender/editors/curve/editcurve_query.c
@@ -118,7 +118,7 @@ bool ED_curve_pick_vert_ex(ViewContext *vc,
 
   uint bases_len;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc->view_layer, vc->v3d, &bases_len);
+      vc->scene, vc->view_layer, vc->v3d, &bases_len);
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     Base *base = bases[base_index];
     data.is_changed = false;
diff --git a/source/blender/editors/curve/editcurve_select.c b/source/blender/editors/curve/editcurve_select.c
index 5a1777b7097..4015ae545da 100644
--- a/source/blender/editors/curve/editcurve_select.c
+++ b/source/blender/editors/curve/editcurve_select.c
@@ -30,7 +30,6 @@
 #include "ED_object.h"
 #include "ED_screen.h"
 #include "ED_select_utils.h"
-#include "ED_types.h"
 #include "ED_view3d.h"
 
 #include "curve_intern.h"
@@ -47,7 +46,7 @@
 bool select_beztriple(BezTriple *bezt, bool selstatus, uint8_t flag, eVisible_Types hidden)
 {
   if ((bezt->hide == 0) || (hidden == HIDDEN)) {
-    if (selstatus == SELECT) { /* selects */
+    if (selstatus) { /* selects */
       bezt->f1 |= flag;
       bezt->f2 |= flag;
       bezt->f3 |= flag;
@@ -66,7 +65,7 @@ bool select_beztriple(BezTriple *bezt, bool selstatus, uint8_t flag, eVisible_Ty
 bool select_bpoint(BPoint *bp, bool selstatus, uint8_t flag, bool hidden)
 {
   if ((bp->hide == 0) || (hidden == 1)) {
-    if (selstatus == SELECT) {
+    if (selstatus) {
       bp->f1 |= flag;
       return true;
     }
@@ -80,17 +79,17 @@ bool select_bpoint(BPoint *bp, bool selstatus, uint8_t flag, bool hidden)
 static bool swap_selection_beztriple(BezTriple *bezt)
 {
   if (bezt->f2 & SELECT) {
-    return select_beztriple(bezt, DESELECT, SELECT, VISIBLE);
+    return select_beztriple(bezt, false, SELECT, VISIBLE);
   }
-  return select_beztriple(bezt, SELECT, SELECT, VISIBLE);
+  return select_beztriple(bezt, true, SELECT, VISIBLE);
 }
 
 static bool swap_selection_bpoint(BPoint *bp)
 {
   if (bp->f1 & SELECT) {
-    return select_bpoint(bp, DESELECT, SELECT, VISIBLE);
+    return select_bpoint(bp, false, SELECT, VISIBLE);
   }
-  return select_bpoint(bp, SELECT, SELECT, VISIBLE);
+  return select_bpoint(bp, true, SELECT, VISIBLE);
 }
 
 bool ED_curve_nurb_select_check(const View3D *v3d, const Nurb *nu)
@@ -260,7 +259,7 @@ bool ED_curve_deselect_all_multi(struct bContext *C)
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &bases_len);
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = ED_curve_deselect_all_multi_ex(bases, bases_len);
   MEM_freeN(bases);
   return changed_multi;
@@ -336,9 +335,9 @@ static void select_adjacent_cp(ListBase *editnurb,
           break;
         }
         if ((lastsel == false) && (bezt->hide == 0) &&
-            ((bezt->f2 & SELECT) || (selstatus == DESELECT))) {
+            ((bezt->f2 & SELECT) || (selstatus == false))) {
           bezt += next;
-          if (!(bezt->f2 & SELECT) || (selstatus == DESELECT)) {
+          if (!(bezt->f2 & SELECT) || (selstatus == false)) {
             bool sel = select_beztriple(bezt, selstatus, SELECT, VISIBLE);
             if (sel && !cont) {
               lastsel = true;
@@ -363,10 +362,9 @@ static void select_adjacent_cp(ListBase *editnurb,
         if (a - abs(next) < 0) {
           break;
         }
-        if ((lastsel == false) && (bp->hide == 0) &&
-            ((bp->f1 & SELECT) || (selstatus == DESELECT))) {
+        if ((lastsel == false) && (bp->hide == 0) && ((bp->f1 & SELECT) || (selstatus == false))) {
           bp += next;
-          if (!(bp->f1 & SELECT) || (selstatus == DESELECT)) {
+          if (!(bp->f1 & SELECT) || (selstatus == false)) {
             bool sel = select_bpoint(bp, selstatus, SELECT, VISIBLE);
             if (sel && !cont) {
               lastsel = true;
@@ -470,14 +468,15 @@ static void selectend_nurb(Object *obedit, eEndPoint_Types selfirst, bool doswap
 
 static int de_select_first_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
-    selectend_nurb(obedit, FIRST, true, DESELECT);
+    selectend_nurb(obedit, FIRST, true, false);
     DEG_id_tag_update(obedit->data, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
     BKE_curve_nurb_vert_active_validate(obedit->data);
@@ -503,14 +502,15 @@ void CURVE_OT_de_select_first(wmOperatorType *ot)
 
 static int de_select_last_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
-    selectend_nurb(obedit, LAST, true, DESELECT);
+    selectend_nurb(obedit, LAST, true, false);
     DEG_id_tag_update(obedit->data, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
     BKE_curve_nurb_vert_active_validate(obedit->data);
@@ -545,11 +545,12 @@ static int de_select_all_exec(bContext *C, wmOperator *op)
 {
   int action = RNA_enum_get(op->ptr, "action");
 
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -618,12 +619,13 @@ void CURVE_OT_select_all(wmOperatorType *ot)
 
 static int select_linked_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -780,12 +782,12 @@ static int select_row_exec(bContext *C, wmOperator *UNUSED(op))
     for (b = 0; b < nu->pntsu; b++, bp++) {
       if (direction) {
         if (a == v) {
-          select_bpoint(bp, SELECT, SELECT, VISIBLE);
+          select_bpoint(bp, true, SELECT, VISIBLE);
         }
       }
       else {
         if (b == u) {
-          select_bpoint(bp, SELECT, SELECT, VISIBLE);
+          select_bpoint(bp, true, SELECT, VISIBLE);
         }
       }
     }
@@ -820,10 +822,11 @@ void CURVE_OT_select_row(wmOperatorType *ot)
 
 static int select_next_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -861,10 +864,11 @@ void CURVE_OT_select_next(wmOperatorType *ot)
 
 static int select_previous_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -923,7 +927,7 @@ static void curve_select_more(Object *obedit)
           if (a % nu->pntsu != 0) {
             tempbp = bp - 1;
             if (!(tempbp->f1 & SELECT)) {
-              select_bpoint(tempbp, SELECT, SELECT, VISIBLE);
+              select_bpoint(tempbp, true, SELECT, VISIBLE);
             }
           }
 
@@ -932,7 +936,7 @@ static void curve_select_more(Object *obedit)
             sel = 0;
             tempbp = bp + nu->pntsu;
             if (!(tempbp->f1 & SELECT)) {
-              sel = select_bpoint(tempbp, SELECT, SELECT, VISIBLE);
+              sel = select_bpoint(tempbp, true, SELECT, VISIBLE);
             }
             /* make sure selected bpoint is discarded */
             if (sel == 1) {
@@ -944,7 +948,7 @@ static void curve_select_more(Object *obedit)
           if (a + nu->pntsu < nu->pntsu * nu->pntsv) {
             tempbp = bp - nu->pntsu;
             if (!(tempbp->f1 & SELECT)) {
-              select_bpoint(tempbp, SELECT, SELECT, VISIBLE);
+              select_bpoint(tempbp, true, SELECT, VISIBLE);
             }
           }
 
@@ -953,7 +957,7 @@ static void curve_select_more(Object *obedit)
             sel = 0;
             tempbp = bp + 1;
             if (!(tempbp->f1 & SELECT)) {
-              sel = select_bpoint(tempbp, SELECT, SELECT, VISIBLE);
+              sel = select_bpoint(tempbp, true, SELECT, VISIBLE);
             }
             if (sel) {
               bp++;
@@ -977,10 +981,11 @@ static void curve_select_more(Object *obedit)
 
 static int curve_select_more_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     curve_select_more(obedit);
@@ -1080,7 +1085,7 @@ static void curve_select_less(Object *obedit)
           }
 
           if (sel != 4) {
-            select_bpoint(bp, DESELECT, SELECT, VISIBLE);
+            select_bpoint(bp, false, SELECT, VISIBLE);
             BLI_BITMAP_ENABLE(selbpoints, a);
           }
         }
@@ -1130,7 +1135,7 @@ static void curve_select_less(Object *obedit)
             }
 
             if (sel != 2) {
-              select_beztriple(bezt, DESELECT, SELECT, VISIBLE);
+              select_beztriple(bezt, false, SELECT, VISIBLE);
               lastsel = true;
             }
             else {
@@ -1175,7 +1180,7 @@ static void curve_select_less(Object *obedit)
             }
 
             if (sel != 2) {
-              select_bpoint(bp, DESELECT, SELECT, VISIBLE);
+              select_bpoint(bp, false, SELECT, VISIBLE);
               lastsel = true;
             }
             else {
@@ -1195,10 +1200,11 @@ static void curve_select_less(Object *obedit)
 
 static int curve_select_less_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     curve_select_less(obedit);
@@ -1236,10 +1242,11 @@ static int curve_select_random_exec(bContext *C, wmOperator *op)
   const float randfac = RNA_float_get(op->ptr, "ratio");
   const int seed = WM_operator_properties_select_random_seed_increment_get(op);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1359,7 +1366,7 @@ static void select_nth_bezt(Nurb *nu, BezTriple *bezt, const struct CheckerInter
   while (a--) {
     const int depth = abs(start - a);
     if (!WM_operator_properties_checker_interval_test(params, depth)) {
-      select_beztriple(bezt, DESELECT, SELECT, HIDDEN);
+      select_beztriple(bezt, false, SELECT, HIDDEN);
     }
 
     bezt--;
@@ -1382,7 +1389,7 @@ static void select_nth_bp(Nurb *nu, BPoint *bp, const struct CheckerIntervalPara
   while (a--) {
     const int depth = abs(pnt - startpnt) + abs(row - startrow);
     if (!WM_operator_properties_checker_interval_test(params, depth)) {
-      select_bpoint(bp, DESELECT, SELECT, HIDDEN);
+      select_bpoint(bp, false, SELECT, HIDDEN);
     }
 
     pnt--;
@@ -1416,6 +1423,7 @@ static bool ed_curve_select_nth(Curve *cu, const struct CheckerIntervalParams *p
 
 static int select_nth_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *obact = CTX_data_edit_object(C);
   View3D *v3d = CTX_wm_view3d(C);
@@ -1426,7 +1434,7 @@ static int select_nth_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Curve *cu = obedit->data;
@@ -1645,7 +1653,7 @@ static bool curve_nurb_select_similar_type(Object *ob,
         }
 
         if (select) {
-          select_beztriple(bezt, SELECT, SELECT, VISIBLE);
+          select_beztriple(bezt, true, SELECT, VISIBLE);
           changed = true;
         }
       }
@@ -1690,7 +1698,7 @@ static bool curve_nurb_select_similar_type(Object *ob,
         }
 
         if (select) {
-          select_bpoint(bp, SELECT, SELECT, VISIBLE);
+          select_bpoint(bp, true, SELECT, VISIBLE);
           changed = true;
         }
       }
@@ -1706,12 +1714,13 @@ static int curve_select_similar_exec(bContext *C, wmOperator *op)
   const float thresh = RNA_float_get(op->ptr, "threshold");
   const int compare = RNA_enum_get(op->ptr, "compare");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   int tot_nurbs_selected_all = 0;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1898,10 +1907,10 @@ static void curve_select_shortest_path_curve(Nurb *nu, int vert_src, int vert_ds
   i = vert_src;
   while (true) {
     if (nu->type & CU_BEZIER) {
-      select_beztriple(&nu->bezt[i], SELECT, SELECT, HIDDEN);
+      select_beztriple(&nu->bezt[i], true, SELECT, HIDDEN);
     }
     else {
-      select_bpoint(&nu->bp[i], SELECT, SELECT, HIDDEN);
+      select_bpoint(&nu->bp[i], true, SELECT, HIDDEN);
     }
 
     if (i == vert_dst) {
@@ -1979,10 +1988,10 @@ static void curve_select_shortest_path_surf(Nurb *nu, int vert_src, int vert_dst
     int i = 0;
     while (vert_curr != vert_src && i++ < vert_num) {
       if (nu->type == CU_BEZIER) {
-        select_beztriple(&nu->bezt[vert_curr], SELECT, SELECT, HIDDEN);
+        select_beztriple(&nu->bezt[vert_curr], true, SELECT, HIDDEN);
       }
       else {
-        select_bpoint(&nu->bp[vert_curr], SELECT, SELECT, HIDDEN);
+        select_bpoint(&nu->bp[vert_curr], true, SELECT, HIDDEN);
       }
       vert_curr = data[vert_curr].vert_prev;
     }
@@ -2040,7 +2049,8 @@ static int edcu_shortest_path_pick_invoke(bContext *C, wmOperator *op, const wmE
 
   BKE_curve_nurb_vert_active_set(cu, nu_dst, vert_dst_p);
 
-  if (vc.view_layer->basact != basact) {
+  BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+  if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
     ED_object_base_activate(C, basact);
   }
 
diff --git a/source/blender/editors/curve/editcurve_undo.c b/source/blender/editors/curve/editcurve_undo.c
index 888bb2169e0..3f53a88ba5d 100644
--- a/source/blender/editors/curve/editcurve_undo.c
+++ b/source/blender/editors/curve/editcurve_undo.c
@@ -160,8 +160,10 @@ static void undocurve_free_data(UndoCurve *uc)
 
 static Object *editcurve_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && ELEM(obedit->type, OB_CURVES_LEGACY, OB_SURF)) {
     Curve *cu = obedit->data;
     if (BKE_curve_editNurbs_get(cu) != NULL) {
@@ -202,9 +204,10 @@ static bool curve_undosys_step_encode(struct bContext *C, struct Main *bmain, Un
 
   /* Important not to use the 3D view when getting objects because all objects
    * outside of this list will be moved out of edit-mode when reading back undo steps. */
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
-  Object **objects = ED_undo_editmode_objects_from_view_layer(view_layer, &objects_len);
+  Object **objects = ED_undo_editmode_objects_from_view_layer(scene, view_layer, &objects_len);
 
   us->elems = MEM_callocN(sizeof(*us->elems) * objects_len, __func__);
   us->elems_len = objects_len;
diff --git a/source/blender/editors/curve/editfont.c b/source/blender/editors/curve/editfont.c
index 611dbb2e80c..03c485a7671 100644
--- a/source/blender/editors/curve/editfont.c
+++ b/source/blender/editors/curve/editfont.c
@@ -26,12 +26,15 @@
 
 #include "BKE_context.h"
 #include "BKE_curve.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_object.h"
 #include "BKE_report.h"
 #include "BKE_vfont.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_query.h"
 
@@ -59,7 +62,7 @@ static int kill_selection(Object *obedit, int ins);
 /** \name Internal Utilities
  * \{ */
 
-static char32_t findaccent(char32_t char1, uint code)
+static char32_t findaccent(char32_t char1, const char code)
 {
   char32_t new = 0;
 
@@ -619,18 +622,19 @@ static void txt_add_object(bContext *C,
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Curve *cu;
   Object *obedit;
-  Base *base;
+  Object *object;
   const struct TextLine *tmp;
   int nchars = 0, nbytes = 0;
   char *s;
   int a;
   const float rot[3] = {0.0f, 0.0f, 0.0f};
 
-  obedit = BKE_object_add(bmain, view_layer, OB_FONT, NULL);
-  base = view_layer->basact;
+  obedit = BKE_object_add(bmain, scene, view_layer, OB_FONT, NULL);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  object = BKE_view_layer_active_object_get(view_layer);
 
   /* seems to assume view align ? TODO: look into this, could be an operator option. */
-  ED_object_base_init_transform_on_add(base->object, NULL, rot);
+  ED_object_base_init_transform_on_add(object, NULL, rot);
 
   BKE_object_where_is_calc(depsgraph, scene, obedit);
 
@@ -1638,12 +1642,11 @@ static int insert_text_invoke(bContext *C, wmOperator *op, const wmEvent *event)
   Object *obedit = CTX_data_edit_object(C);
   Curve *cu = obedit->data;
   EditFont *ef = cu->editfont;
-  static int accentcode = 0;
-  uintptr_t ascii = event->ascii;
+  static bool accentcode = false;
   const bool alt = event->modifier & KM_ALT;
   const bool shift = event->modifier & KM_SHIFT;
   const bool ctrl = event->modifier & KM_CTRL;
-  int event_type = event->type, event_val = event->val;
+  char32_t insert_char_override = 0;
   char32_t inserted_text[2] = {0};
 
   if (RNA_struct_property_is_set(op->ptr, "text")) {
@@ -1652,48 +1655,47 @@ static int insert_text_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 
   if (RNA_struct_property_is_set(op->ptr, "accent")) {
     if (ef->len != 0 && ef->pos > 0) {
-      accentcode = 1;
+      accentcode = true;
     }
     return OPERATOR_FINISHED;
   }
 
-  /* tab should exit editmode, but we allow it to be typed using modifier keys */
-  if (event_type == EVT_TABKEY) {
-    if ((alt || ctrl || shift) == 0) {
-      return OPERATOR_PASS_THROUGH;
-    }
-
-    ascii = 9;
-  }
-
-  if (event_type == EVT_BACKSPACEKEY) {
+  if (event->type == EVT_BACKSPACEKEY) {
     if (alt && ef->len != 0 && ef->pos > 0) {
-      accentcode = 1;
+      accentcode = true;
     }
     return OPERATOR_PASS_THROUGH;
   }
 
-  if (event_val && (ascii || event->utf8_buf[0])) {
-    /* handle case like TAB (== 9) */
-    if ((ascii > 31 && ascii < 254 && ascii != 127) || (ELEM(ascii, 13, 10)) || (ascii == 8) ||
-        (event->utf8_buf[0])) {
+  /* Tab typically exit edit-mode, but we allow it to be typed using modifier keys. */
+  if (event->type == EVT_TABKEY) {
+    if ((alt || ctrl || shift) == 0) {
+      return OPERATOR_PASS_THROUGH;
+    }
+    insert_char_override = '\t';
+  }
 
+  if (insert_char_override || event->utf8_buf[0]) {
+    if (insert_char_override) {
+      /* Handle case like TAB ('\t'). */
+      inserted_text[0] = insert_char_override;
+      insert_into_textbuf(obedit, insert_char_override);
+      text_update_edited(C, obedit, FO_EDIT);
+    }
+    else {
+      BLI_assert(event->utf8_buf[0]);
       if (accentcode) {
         if (ef->pos > 0) {
-          inserted_text[0] = findaccent(ef->textbuf[ef->pos - 1], ascii);
+          inserted_text[0] = findaccent(ef->textbuf[ef->pos - 1],
+                                        BLI_str_utf8_as_unicode(event->utf8_buf));
           ef->textbuf[ef->pos - 1] = inserted_text[0];
         }
-        accentcode = 0;
+        accentcode = false;
       }
       else if (event->utf8_buf[0]) {
         inserted_text[0] = BLI_str_utf8_as_unicode(event->utf8_buf);
-        ascii = inserted_text[0];
-        insert_into_textbuf(obedit, ascii);
-        accentcode = 0;
-      }
-      else if (ascii) {
-        insert_into_textbuf(obedit, ascii);
-        accentcode = 0;
+        insert_into_textbuf(obedit, inserted_text[0]);
+        accentcode = false;
       }
       else {
         BLI_assert(0);
@@ -1702,11 +1704,6 @@ static int insert_text_invoke(bContext *C, wmOperator *op, const wmEvent *event)
       kill_selection(obedit, 1);
       text_update_edited(C, obedit, FO_EDIT);
     }
-    else {
-      inserted_text[0] = ascii;
-      insert_into_textbuf(obedit, ascii);
-      text_update_edited(C, obedit, FO_EDIT);
-    }
   }
   else {
     return OPERATOR_PASS_THROUGH;
@@ -1720,11 +1717,6 @@ static int insert_text_invoke(bContext *C, wmOperator *op, const wmEvent *event)
     RNA_string_set(op->ptr, "text", inserted_utf8);
   }
 
-  /* reset property? */
-  if (event_val == 0) {
-    accentcode = 0;
-  }
-
   return OPERATOR_FINISHED;
 }
 
@@ -1974,6 +1966,8 @@ static int set_case_exec(bContext *C, wmOperator *op)
 
 void FONT_OT_case_set(wmOperatorType *ot)
 {
+  PropertyRNA *prop;
+
   /* identifiers */
   ot->name = "Set Case";
   ot->description = "Set font case";
@@ -1987,7 +1981,8 @@ void FONT_OT_case_set(wmOperatorType *ot)
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
   /* properties */
-  RNA_def_enum(ot->srna, "case", case_items, CASE_LOWER, "Case", "Lower or upper case");
+  prop = RNA_def_enum(ot->srna, "case", case_items, CASE_LOWER, "Case", "Lower or upper case");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_TEXT);
 }
 
 /** \} */
diff --git a/source/blender/editors/curve/editfont_undo.c b/source/blender/editors/curve/editfont_undo.c
index 09e5428b0f9..17ed75b9d10 100644
--- a/source/blender/editors/curve/editfont_undo.c
+++ b/source/blender/editors/curve/editfont_undo.c
@@ -19,6 +19,7 @@
 #include "DNA_scene_types.h"
 
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_undo_system.h"
 #include "BKE_vfont.h"
@@ -307,8 +308,10 @@ static void undofont_free_data(UndoFont *uf)
 
 static Object *editfont_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && obedit->type == OB_FONT) {
     Curve *cu = obedit->data;
     EditFont *ef = cu->editfont;
diff --git a/source/blender/editors/curves/CMakeLists.txt b/source/blender/editors/curves/CMakeLists.txt
index 303d2fb71dc..945bba0a77c 100644
--- a/source/blender/editors/curves/CMakeLists.txt
+++ b/source/blender/editors/curves/CMakeLists.txt
@@ -13,6 +13,7 @@ set(INC
   ../../makesrna
   ../../windowmanager
   ../../../../intern/guardedalloc
+  ../../bmesh
 
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/curves/intern/curves_add.cc b/source/blender/editors/curves/intern/curves_add.cc
index 79916253207..f234a58f439 100644
--- a/source/blender/editors/curves/intern/curves_add.cc
+++ b/source/blender/editors/curves/intern/curves_add.cc
@@ -102,10 +102,9 @@ bke::CurvesGeometry primitive_random_sphere(const int curves_size, const int poi
 
   MutableSpan<int> offsets = curves.offsets_for_write();
   MutableSpan<float3> positions = curves.positions_for_write();
-
-  float *radius_data = (float *)CustomData_add_layer_named(
-      &curves.point_data, CD_PROP_FLOAT, CD_DEFAULT, nullptr, curves.point_num, "radius");
-  MutableSpan<float> radii{radius_data, curves.points_num()};
+  bke::MutableAttributeAccessor attributes = curves.attributes_for_write();
+  bke::SpanAttributeWriter<float> radius = attributes.lookup_or_add_for_write_only_span<float>(
+      "radius", ATTR_DOMAIN_POINT);
 
   for (const int i : offsets.index_range()) {
     offsets[i] = points_per_curve * i;
@@ -114,9 +113,9 @@ bke::CurvesGeometry primitive_random_sphere(const int curves_size, const int poi
   RandomNumberGenerator rng;
 
   for (const int i : curves.curves_range()) {
-    const IndexRange curve_range = curves.points_for_curve(i);
-    MutableSpan<float3> curve_positions = positions.slice(curve_range);
-    MutableSpan<float> curve_radii = radii.slice(curve_range);
+    const IndexRange points = curves.points_for_curve(i);
+    MutableSpan<float3> curve_positions = positions.slice(points);
+    MutableSpan<float> curve_radii = radius.span.slice(points);
 
     const float theta = 2.0f * M_PI * rng.get_float();
     const float phi = saacosf(2.0f * rng.get_float() - 1.0f);
@@ -135,6 +134,8 @@ bke::CurvesGeometry primitive_random_sphere(const int curves_size, const int poi
     }
   }
 
+  radius.finish();
+
   return curves;
 }
 
diff --git a/source/blender/editors/curves/intern/curves_ops.cc b/source/blender/editors/curves/intern/curves_ops.cc
index a4492a1d516..54d91ccfc90 100644
--- a/source/blender/editors/curves/intern/curves_ops.cc
+++ b/source/blender/editors/curves/intern/curves_ops.cc
@@ -94,11 +94,53 @@ VectorSet<Curves *> get_unique_editable_curves(const bContext &C)
   return unique_curves;
 }
 
+static bool curves_poll_impl(bContext *C, const bool check_editable, const bool check_surface)
+{
+  Object *object = CTX_data_active_object(C);
+  if (object == nullptr || object->type != OB_CURVES) {
+    return false;
+  }
+  if (check_editable) {
+    if (!ED_operator_object_active_editable_ex(C, object)) {
+      return false;
+    }
+  }
+  if (check_surface) {
+    Curves &curves = *static_cast<Curves *>(object->data);
+    if (curves.surface == nullptr || curves.surface->type != OB_MESH) {
+      CTX_wm_operator_poll_msg_set(C, "Curves must have a mesh surface object set");
+      return false;
+    }
+  }
+  return true;
+}
+
+bool editable_curves_with_surface_poll(bContext *C)
+{
+  return curves_poll_impl(C, true, true);
+}
+
+bool curves_with_surface_poll(bContext *C)
+{
+  return curves_poll_impl(C, false, true);
+}
+
+bool editable_curves_poll(bContext *C)
+{
+  return curves_poll_impl(C, false, false);
+}
+
+bool curves_poll(bContext *C)
+{
+  return curves_poll_impl(C, false, false);
+}
+
 using bke::CurvesGeometry;
 
 namespace convert_to_particle_system {
 
-static int find_mface_for_root_position(const Mesh &mesh,
+static int find_mface_for_root_position(const Span<MVert> verts,
+                                        const MFace *mface,
                                         const Span<int> possible_mface_indices,
                                         const float3 &root_pos)
 {
@@ -110,14 +152,14 @@ static int find_mface_for_root_position(const Mesh &mesh,
   int mface_i;
   float best_distance_sq = FLT_MAX;
   for (const int possible_mface_i : possible_mface_indices) {
-    const MFace &possible_mface = mesh.mface[possible_mface_i];
+    const MFace &possible_mface = mface[possible_mface_i];
     {
       float3 point_in_triangle;
       closest_on_tri_to_point_v3(point_in_triangle,
                                  root_pos,
-                                 mesh.mvert[possible_mface.v1].co,
-                                 mesh.mvert[possible_mface.v2].co,
-                                 mesh.mvert[possible_mface.v3].co);
+                                 verts[possible_mface.v1].co,
+                                 verts[possible_mface.v2].co,
+                                 verts[possible_mface.v3].co);
       const float distance_sq = len_squared_v3v3(root_pos, point_in_triangle);
       if (distance_sq < best_distance_sq) {
         best_distance_sq = distance_sq;
@@ -129,9 +171,9 @@ static int find_mface_for_root_position(const Mesh &mesh,
       float3 point_in_triangle;
       closest_on_tri_to_point_v3(point_in_triangle,
                                  root_pos,
-                                 mesh.mvert[possible_mface.v1].co,
-                                 mesh.mvert[possible_mface.v3].co,
-                                 mesh.mvert[possible_mface.v4].co);
+                                 verts[possible_mface.v1].co,
+                                 verts[possible_mface.v3].co,
+                                 verts[possible_mface.v4].co);
       const float distance_sq = len_squared_v3v3(root_pos, point_in_triangle);
       if (distance_sq < best_distance_sq) {
         best_distance_sq = distance_sq;
@@ -145,25 +187,22 @@ static int find_mface_for_root_position(const Mesh &mesh,
 /**
  * \return Barycentric coordinates in the #MFace.
  */
-static float4 compute_mface_weights_for_position(const Mesh &mesh,
+static float4 compute_mface_weights_for_position(const Span<MVert> verts,
                                                  const MFace &mface,
                                                  const float3 &position)
 {
   float4 mface_weights;
   if (mface.v4) {
     float mface_verts_su[4][3];
-    copy_v3_v3(mface_verts_su[0], mesh.mvert[mface.v1].co);
-    copy_v3_v3(mface_verts_su[1], mesh.mvert[mface.v2].co);
-    copy_v3_v3(mface_verts_su[2], mesh.mvert[mface.v3].co);
-    copy_v3_v3(mface_verts_su[3], mesh.mvert[mface.v4].co);
+    copy_v3_v3(mface_verts_su[0], verts[mface.v1].co);
+    copy_v3_v3(mface_verts_su[1], verts[mface.v2].co);
+    copy_v3_v3(mface_verts_su[2], verts[mface.v3].co);
+    copy_v3_v3(mface_verts_su[3], verts[mface.v4].co);
     interp_weights_poly_v3(mface_weights, mface_verts_su, 4, position);
   }
   else {
-    interp_weights_tri_v3(mface_weights,
-                          mesh.mvert[mface.v1].co,
-                          mesh.mvert[mface.v2].co,
-                          mesh.mvert[mface.v3].co,
-                          position);
+    interp_weights_tri_v3(
+        mface_weights, verts[mface.v1].co, verts[mface.v2].co, verts[mface.v3].co, position);
     mface_weights[3] = 0.0f;
   }
   return mface_weights;
@@ -246,6 +285,9 @@ static void try_convert_single_object(Object &curves_ob,
   /* Prepare transformation matrices. */
   const bke::CurvesSurfaceTransforms transforms{curves_ob, &surface_ob};
 
+  const MFace *mfaces = (const MFace *)CustomData_get_layer(&surface_me.fdata, CD_MFACE);
+  const Span<MVert> verts = surface_me.verts();
+
   for (const int new_hair_i : IndexRange(hair_num)) {
     const int curve_i = new_hair_i;
     const IndexRange points = curves.points_for_curve(curve_i);
@@ -264,11 +306,10 @@ static void try_convert_single_object(Object &curves_ob,
     const int poly_i = looptri.poly;
 
     const int mface_i = find_mface_for_root_position(
-        surface_me, poly_to_mface_map[poly_i], root_pos_su);
-    const MFace &mface = surface_me.mface[mface_i];
+        verts, mfaces, poly_to_mface_map[poly_i], root_pos_su);
+    const MFace &mface = mfaces[mface_i];
 
-    const float4 mface_weights = compute_mface_weights_for_position(
-        surface_me, mface, root_pos_su);
+    const float4 mface_weights = compute_mface_weights_for_position(verts, mface, root_pos_su);
 
     ParticleData &particle = particles[new_hair_i];
     const int num_keys = points.size();
@@ -337,16 +378,6 @@ static int curves_convert_to_particle_system_exec(bContext *C, wmOperator *op)
   return OPERATOR_FINISHED;
 }
 
-static bool curves_convert_to_particle_system_poll(bContext *C)
-{
-  Object *ob = CTX_data_active_object(C);
-  if (ob == nullptr || ob->type != OB_CURVES) {
-    return false;
-  }
-  Curves &curves = *static_cast<Curves *>(ob->data);
-  return curves.surface != nullptr;
-}
-
 }  // namespace convert_to_particle_system
 
 static void CURVES_OT_convert_to_particle_system(wmOperatorType *ot)
@@ -355,7 +386,7 @@ static void CURVES_OT_convert_to_particle_system(wmOperatorType *ot)
   ot->idname = "CURVES_OT_convert_to_particle_system";
   ot->description = "Add a new or update an existing hair particle system on the surface object";
 
-  ot->poll = convert_to_particle_system::curves_convert_to_particle_system_poll;
+  ot->poll = curves_with_surface_poll;
   ot->exec = convert_to_particle_system::curves_convert_to_particle_system_exec;
 
   ot->flag = OPTYPE_UNDO | OPTYPE_REGISTER;
@@ -440,6 +471,7 @@ static bke::CurvesGeometry particles_to_curves(Object &object, ParticleSystem &p
 static int curves_convert_from_particle_system_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Main &bmain = *CTX_data_main(C);
+  Scene &scene = *CTX_data_scene(C);
   ViewLayer &view_layer = *CTX_data_view_layer(C);
   Depsgraph &depsgraph = *CTX_data_depsgraph_pointer(C);
   Object *ob_from_orig = ED_object_active_context(C);
@@ -464,7 +496,7 @@ static int curves_convert_from_particle_system_exec(bContext *C, wmOperator *UNU
     psys_eval = psmd->psys;
   }
 
-  Object *ob_new = BKE_object_add(&bmain, &view_layer, OB_CURVES, psys_eval->name);
+  Object *ob_new = BKE_object_add(&bmain, &scene, &view_layer, OB_CURVES, psys_eval->name);
   Curves *curves_id = static_cast<Curves *>(ob_new->data);
   BKE_object_apply_mat4(ob_new, ob_from_orig->obmat, true, false);
   bke::CurvesGeometry::wrap(curves_id->geometry) = particles_to_curves(*ob_from_eval, *psys_eval);
@@ -501,22 +533,6 @@ enum class AttachMode {
   Deform,
 };
 
-static bool snap_curves_to_surface_poll(bContext *C)
-{
-  Object *ob = CTX_data_active_object(C);
-  if (ob == nullptr || ob->type != OB_CURVES) {
-    return false;
-  }
-  if (!ED_operator_object_active_editable_ex(C, ob)) {
-    return false;
-  }
-  Curves &curves = *static_cast<Curves *>(ob->data);
-  if (curves.surface == nullptr) {
-    return false;
-  }
-  return true;
-}
-
 static void snap_curves_to_surface_exec_object(Object &curves_ob,
                                                const Object &surface_ob,
                                                const AttachMode attach_mode,
@@ -526,14 +542,14 @@ static void snap_curves_to_surface_exec_object(Object &curves_ob,
   Curves &curves_id = *static_cast<Curves *>(curves_ob.data);
   CurvesGeometry &curves = CurvesGeometry::wrap(curves_id.geometry);
 
-  Mesh &surface_mesh = *static_cast<Mesh *>(surface_ob.data);
-
-  MeshComponent surface_mesh_component;
-  surface_mesh_component.replace(&surface_mesh, GeometryOwnershipType::ReadOnly);
-
+  const Mesh &surface_mesh = *static_cast<const Mesh *>(surface_ob.data);
+  const Span<MVert> verts = surface_mesh.verts();
+  const Span<MLoop> loops = surface_mesh.loops();
+  const Span<MLoopTri> surface_looptris = {BKE_mesh_runtime_looptri_ensure(&surface_mesh),
+                                           BKE_mesh_runtime_looptri_len(&surface_mesh)};
   VArraySpan<float2> surface_uv_map;
   if (curves_id.surface_uv_map != nullptr) {
-    const bke::AttributeAccessor surface_attributes = bke::mesh_attributes(surface_mesh);
+    const bke::AttributeAccessor surface_attributes = surface_mesh.attributes();
     surface_uv_map = surface_attributes
                          .lookup(curves_id.surface_uv_map, ATTR_DOMAIN_CORNER, CD_PROP_FLOAT2)
                          .typed<float2>();
@@ -542,9 +558,6 @@ static void snap_curves_to_surface_exec_object(Object &curves_ob,
   MutableSpan<float3> positions_cu = curves.positions_for_write();
   MutableSpan<float2> surface_uv_coords = curves.surface_uv_coords_for_write();
 
-  const Span<MLoopTri> surface_looptris = {BKE_mesh_runtime_looptri_ensure(&surface_mesh),
-                                           BKE_mesh_runtime_looptri_len(&surface_mesh)};
-
   const bke::CurvesSurfaceTransforms transforms{curves_ob, &surface_ob};
 
   switch (attach_mode) {
@@ -591,9 +604,9 @@ static void snap_curves_to_surface_exec_object(Object &curves_ob,
             const float2 &uv0 = surface_uv_map[corner0];
             const float2 &uv1 = surface_uv_map[corner1];
             const float2 &uv2 = surface_uv_map[corner2];
-            const float3 &p0_su = surface_mesh.mvert[surface_mesh.mloop[corner0].v].co;
-            const float3 &p1_su = surface_mesh.mvert[surface_mesh.mloop[corner1].v].co;
-            const float3 &p2_su = surface_mesh.mvert[surface_mesh.mloop[corner2].v].co;
+            const float3 &p0_su = verts[loops[corner0].v].co;
+            const float3 &p1_su = verts[loops[corner1].v].co;
+            const float3 &p2_su = verts[loops[corner2].v].co;
             float3 bary_coords;
             interp_weights_tri_v3(bary_coords, p0_su, p1_su, p2_su, new_first_point_pos_su);
             const float2 uv = attribute_math::mix3(bary_coords, uv0, uv1, uv2);
@@ -627,9 +640,9 @@ static void snap_curves_to_surface_exec_object(Object &curves_ob,
           const MLoopTri &looptri = *lookup_result.looptri;
           const float3 &bary_coords = lookup_result.bary_weights;
 
-          const float3 &p0_su = surface_mesh.mvert[surface_mesh.mloop[looptri.tri[0]].v].co;
-          const float3 &p1_su = surface_mesh.mvert[surface_mesh.mloop[looptri.tri[1]].v].co;
-          const float3 &p2_su = surface_mesh.mvert[surface_mesh.mloop[looptri.tri[2]].v].co;
+          const float3 &p0_su = verts[loops[looptri.tri[0]].v].co;
+          const float3 &p1_su = verts[loops[looptri.tri[1]].v].co;
+          const float3 &p2_su = verts[loops[looptri.tri[2]].v].co;
 
           float3 new_first_point_pos_su;
           interp_v3_v3v3v3(new_first_point_pos_su, p0_su, p1_su, p2_su, bary_coords);
@@ -681,7 +694,7 @@ static int snap_curves_to_surface_exec(bContext *C, wmOperator *op)
     BKE_report(op->reports, RPT_INFO, "Could not snap some curves to the surface");
   }
 
-  /* Refresh the entire window to also clear eventual modifier and nodes editor warnings.*/
+  /* Refresh the entire window to also clear eventual modifier and nodes editor warnings. */
   WM_event_add_notifier(C, NC_WINDOW, nullptr);
 
   return OPERATOR_FINISHED;
@@ -697,7 +710,7 @@ static void CURVES_OT_snap_curves_to_surface(wmOperatorType *ot)
   ot->idname = "CURVES_OT_snap_curves_to_surface";
   ot->description = "Move curves so that the first point is exactly on the surface mesh";
 
-  ot->poll = snap_curves_to_surface_poll;
+  ot->poll = editable_curves_with_surface_poll;
   ot->exec = snap_curves_to_surface_exec;
 
   ot->flag = OPTYPE_UNDO | OPTYPE_REGISTER;
@@ -726,21 +739,6 @@ static void CURVES_OT_snap_curves_to_surface(wmOperatorType *ot)
                "How to find the point on the surface to attach to");
 }
 
-bool selection_operator_poll(bContext *C)
-{
-  const Object *object = CTX_data_active_object(C);
-  if (object == nullptr) {
-    return false;
-  }
-  if (object->type != OB_CURVES) {
-    return false;
-  }
-  if (!BKE_id_is_editable(CTX_data_main(C), static_cast<const ID *>(object->data))) {
-    return false;
-  }
-  return true;
-}
-
 namespace set_selection_domain {
 
 static int curves_set_selection_domain_exec(bContext *C, wmOperator *op)
@@ -758,6 +756,9 @@ static int curves_set_selection_domain_exec(bContext *C, wmOperator *op)
 
     CurvesGeometry &curves = CurvesGeometry::wrap(curves_id->geometry);
     bke::MutableAttributeAccessor attributes = curves.attributes_for_write();
+    if (curves.points_num() == 0) {
+      continue;
+    }
 
     if (old_domain == ATTR_DOMAIN_POINT && domain == ATTR_DOMAIN_CURVE) {
       VArray<float> curve_selection = curves.adapt_domain(
@@ -794,7 +795,7 @@ static void CURVES_OT_set_selection_domain(wmOperatorType *ot)
   ot->description = "Change the mode used for selection masking in curves sculpt mode";
 
   ot->exec = set_selection_domain::curves_set_selection_domain_exec;
-  ot->poll = selection_operator_poll;
+  ot->poll = editable_curves_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
@@ -830,7 +831,7 @@ static void CURVES_OT_disable_selection(wmOperatorType *ot)
   ot->description = "Disable the drawing of influence of selection in sculpt mode";
 
   ot->exec = disable_selection::curves_disable_selection_exec;
-  ot->poll = selection_operator_poll;
+  ot->poll = editable_curves_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
@@ -936,7 +937,7 @@ static void SCULPT_CURVES_OT_select_all(wmOperatorType *ot)
   ot->description = "(De)select all control points";
 
   ot->exec = select_all::select_all_exec;
-  ot->poll = selection_operator_poll;
+  ot->poll = editable_curves_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
diff --git a/source/blender/editors/geometry/CMakeLists.txt b/source/blender/editors/geometry/CMakeLists.txt
index e0c440b09b4..6e28bb3e8ec 100644
--- a/source/blender/editors/geometry/CMakeLists.txt
+++ b/source/blender/editors/geometry/CMakeLists.txt
@@ -10,6 +10,7 @@ set(INC
   ../../makesrna
   ../../windowmanager
   ../../../../intern/guardedalloc
+  ../../bmesh
 )
 
 set(INC_SYS
diff --git a/source/blender/editors/geometry/geometry_attributes.cc b/source/blender/editors/geometry/geometry_attributes.cc
index 4cf14334ac7..14f2f8c6af5 100644
--- a/source/blender/editors/geometry/geometry_attributes.cc
+++ b/source/blender/editors/geometry/geometry_attributes.cc
@@ -275,14 +275,14 @@ static int geometry_attribute_convert_exec(bContext *C, wmOperator *op)
 {
   Object *ob = ED_object_context(C);
   ID *ob_data = static_cast<ID *>(ob->data);
-  CustomDataLayer *layer = BKE_id_attributes_active_get(ob_data);
+  const CustomDataLayer *layer = BKE_id_attributes_active_get(ob_data);
   const std::string name = layer->name;
 
   const ConvertAttributeMode mode = static_cast<ConvertAttributeMode>(
       RNA_enum_get(op->ptr, "mode"));
 
   Mesh *mesh = reinterpret_cast<Mesh *>(ob_data);
-  bke::MutableAttributeAccessor attributes = bke::mesh_attributes_for_write(*mesh);
+  bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
 
   /* General conversion steps are always the same:
    * 1. Convert old data to right domain and data type.
@@ -305,7 +305,7 @@ static int geometry_attribute_convert_exec(bContext *C, wmOperator *op)
       void *new_data = MEM_malloc_arrayN(src_varray.size(), cpp_type.size(), __func__);
       src_varray.materialize_to_uninitialized(new_data);
       attributes.remove(name);
-      attributes.add(name, dst_domain, dst_type, blender::bke::AttributeInitMove(new_data));
+      attributes.add(name, dst_domain, dst_type, blender::bke::AttributeInitMoveArray(new_data));
       break;
     }
     case ConvertAttributeMode::UVMap: {
@@ -405,7 +405,7 @@ void GEOMETRY_OT_color_attribute_add(wmOperatorType *ot)
 
   prop = RNA_def_float_color(
       ot->srna, "color", 4, nullptr, 0.0f, FLT_MAX, "Color", "Default fill color", 0.0f, 1.0f);
-  RNA_def_property_subtype(prop, PROP_COLOR_GAMMA);
+  RNA_def_property_subtype(prop, PROP_COLOR);
   RNA_def_property_float_array_default(prop, default_color);
 }
 
@@ -471,11 +471,6 @@ static int geometry_color_attribute_remove_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  if (GS(id->name) == ID_ME) {
-    Mesh *me = static_cast<Mesh *>(ob->data);
-    BKE_mesh_update_customdata_pointers(me, true);
-  }
-
   DEG_id_tag_update(id, ID_RECALC_GEOMETRY);
   WM_main_add_notifier(NC_GEOM | ND_DATA, id);
 
@@ -651,8 +646,7 @@ bool ED_geometry_attribute_convert(Mesh *mesh,
     return false;
   }
 
-  blender::bke::MutableAttributeAccessor attributes = blender::bke::mesh_attributes_for_write(
-      *mesh);
+  blender::bke::MutableAttributeAccessor attributes = mesh->attributes_for_write();
 
   GVArray src_varray = attributes.lookup_or_default(name, new_domain, new_type);
 
@@ -660,7 +654,7 @@ bool ED_geometry_attribute_convert(Mesh *mesh,
   void *new_data = MEM_malloc_arrayN(src_varray.size(), cpp_type.size(), __func__);
   src_varray.materialize_to_uninitialized(new_data);
   attributes.remove(name);
-  attributes.add(name, new_domain, new_type, blender::bke::AttributeInitMove(new_data));
+  attributes.add(name, new_domain, new_type, blender::bke::AttributeInitMoveArray(new_data));
 
   int *active_index = BKE_id_attributes_active_index_p(&mesh->id);
   if (*active_index > 0) {
diff --git a/source/blender/editors/gizmo_library/CMakeLists.txt b/source/blender/editors/gizmo_library/CMakeLists.txt
index 0484c47f081..84181b5f95d 100644
--- a/source/blender/editors/gizmo_library/CMakeLists.txt
+++ b/source/blender/editors/gizmo_library/CMakeLists.txt
@@ -13,7 +13,6 @@ set(INC
   ../../windowmanager
   ../../../../intern/clog
   ../../../../intern/eigen
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/gizmo_library/gizmo_types/button2d_gizmo.c b/source/blender/editors/gizmo_library/gizmo_types/button2d_gizmo.c
index 2c886230f10..6eac235a191 100644
--- a/source/blender/editors/gizmo_library/gizmo_types/button2d_gizmo.c
+++ b/source/blender/editors/gizmo_library/gizmo_types/button2d_gizmo.c
@@ -217,7 +217,7 @@ static void button2d_draw_intern(const bContext *C,
           GPU_batch_uniform_1f(button->shape_batch[i], "lineWidth", gz->line_width * U.pixelsize);
         }
         else {
-          GPU_batch_program_set_builtin(button->shape_batch[i], GPU_SHADER_2D_UNIFORM_COLOR);
+          GPU_batch_program_set_builtin(button->shape_batch[i], GPU_SHADER_3D_UNIFORM_COLOR);
         }
 
         /* Invert line color for wire. */
diff --git a/source/blender/editors/gizmo_library/gizmo_types/cage2d_gizmo.c b/source/blender/editors/gizmo_library/gizmo_types/cage2d_gizmo.c
index 54aa5d16941..600abaf3737 100644
--- a/source/blender/editors/gizmo_library/gizmo_types/cage2d_gizmo.c
+++ b/source/blender/editors/gizmo_library/gizmo_types/cage2d_gizmo.c
@@ -388,7 +388,7 @@ static void cage2d_draw_box_interaction(const float color[4],
       .pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT),
       .col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT),
   };
-  immBindBuiltinProgram(is_solid ? GPU_SHADER_2D_FLAT_COLOR : GPU_SHADER_3D_POLYLINE_FLAT_COLOR);
+  immBindBuiltinProgram(is_solid ? GPU_SHADER_3D_FLAT_COLOR : GPU_SHADER_3D_POLYLINE_FLAT_COLOR);
 
   {
     if (is_solid) {
@@ -546,7 +546,7 @@ static void cage2d_draw_circle_handles(const rctf *r,
   const int resolu = 12;
   const float rad[2] = {margin[0] / 3, margin[1] / 3};
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3fv(color);
 
   /* should  really divide by two, but looks too bulky. */
@@ -598,7 +598,7 @@ static void gizmo_cage2d_draw_intern(wmGizmo *gz,
   if (false) {
     GPU_blend(GPU_BLEND_ALPHA);
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4fv((const float[4]){1, 1, 1, 0.5f});
     float s = 0.5f;
     immRectf(pos, -s, -s, s, s);
diff --git a/source/blender/editors/gpencil/CMakeLists.txt b/source/blender/editors/gpencil/CMakeLists.txt
index 09a3cac0d48..866df16f3d6 100644
--- a/source/blender/editors/gpencil/CMakeLists.txt
+++ b/source/blender/editors/gpencil/CMakeLists.txt
@@ -12,8 +12,8 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
+  ../../bmesh
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
 )
diff --git a/source/blender/editors/gpencil/annotate_paint.c b/source/blender/editors/gpencil/annotate_paint.c
index 2d613e2f433..ea34e6530fa 100644
--- a/source/blender/editors/gpencil/annotate_paint.c
+++ b/source/blender/editors/gpencil/annotate_paint.c
@@ -1715,7 +1715,7 @@ static void annotation_draw_eraser(bContext *UNUSED(C), int x, int y, void *p_pt
   if (p->paintmode == GP_PAINTMODE_ERASER) {
     GPUVertFormat *format = immVertexFormat();
     const uint shdr_pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     GPU_line_smooth(true);
     GPU_blend(GPU_BLEND_ALPHA);
@@ -1725,7 +1725,7 @@ static void annotation_draw_eraser(bContext *UNUSED(C), int x, int y, void *p_pt
 
     immUnbindProgram();
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -1782,7 +1782,7 @@ static void annotation_draw_stabilizer(bContext *C, int x, int y, void *p_ptr)
 
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_line_smooth(true);
   GPU_blend(GPU_BLEND_ALPHA);
   GPU_line_width(1.25f);
@@ -2346,7 +2346,7 @@ static int annotation_draw_invoke(bContext *C, wmOperator *op, const wmEvent *ev
   return OPERATOR_RUNNING_MODAL;
 }
 
-/* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
+/* gpencil modal operator stores area, which can be removed while using it (like full-screen). */
 static bool annotation_area_exists(bContext *C, ScrArea *area_test)
 {
   bScreen *screen = CTX_wm_screen(C);
@@ -2641,7 +2641,7 @@ static int annotation_draw_modal(bContext *C, wmOperator *op, const wmEvent *eve
   /* handle mode-specific events */
   if (p->status == GP_STATUS_PAINTING) {
     /* handle painting mouse-movements? */
-    if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE) || (p->flags & GP_PAINTFLAG_FIRSTRUN)) {
+    if (ISMOUSE_MOTION(event->type) || (p->flags & GP_PAINTFLAG_FIRSTRUN)) {
       /* handle drawing event */
       if ((p->flags & GP_PAINTFLAG_FIRSTRUN) == 0) {
         annotation_add_missing_events(C, op, event, p);
@@ -2698,7 +2698,7 @@ static int annotation_draw_modal(bContext *C, wmOperator *op, const wmEvent *eve
     }
   }
 
-  /* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
+  /* gpencil modal operator stores area, which can be removed while using it (like full-screen). */
   if (0 == annotation_area_exists(C, p->area)) {
     estate = OPERATOR_CANCELLED;
   }
diff --git a/source/blender/editors/gpencil/gpencil_add_blank.c b/source/blender/editors/gpencil/gpencil_add_blank.c
index e8e6d328804..b88b33913ac 100644
--- a/source/blender/editors/gpencil/gpencil_add_blank.c
+++ b/source/blender/editors/gpencil/gpencil_add_blank.c
@@ -19,6 +19,8 @@
 #include "BKE_main.h"
 #include "BKE_material.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 
 #include "ED_gpencil.h"
@@ -34,7 +36,7 @@ typedef struct ColorTemplate {
 static int gpencil_stroke_material(Main *bmain, Object *ob, const ColorTemplate *pct)
 {
   int index;
-  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, pct->name, &index);
+  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, DATA_(pct->name), &index);
 
   copy_v4_v4(ma->gp_style->stroke_rgba, pct->line);
   srgb_to_linearrgb_v4(ma->gp_style->stroke_rgba, ma->gp_style->stroke_rgba);
@@ -52,7 +54,7 @@ static int gpencil_stroke_material(Main *bmain, Object *ob, const ColorTemplate
 /* Color Data */
 
 static const ColorTemplate gp_stroke_material_black = {
-    "Black",
+    N_("Black"),
     {0.0f, 0.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
diff --git a/source/blender/editors/gpencil/gpencil_add_lineart.c b/source/blender/editors/gpencil/gpencil_add_lineart.c
index 964a57a8ced..2ac26c927f4 100644
--- a/source/blender/editors/gpencil/gpencil_add_lineart.c
+++ b/source/blender/editors/gpencil/gpencil_add_lineart.c
@@ -21,6 +21,8 @@
 #include "BKE_main.h"
 #include "BKE_material.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_query.h"
 
@@ -40,7 +42,7 @@ static int gpencil_lineart_material(Main *bmain,
                                     const bool fill)
 {
   int index;
-  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, pct->name, &index);
+  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, DATA_(pct->name), &index);
 
   copy_v4_v4(ma->gp_style->stroke_rgba, pct->line);
   srgb_to_linearrgb_v4(ma->gp_style->stroke_rgba, ma->gp_style->stroke_rgba);
@@ -59,7 +61,7 @@ static int gpencil_lineart_material(Main *bmain,
 /* Color Data */
 
 static const ColorTemplate gp_stroke_material_black = {
-    "Black",
+    N_("Black"),
     {0.0f, 0.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
diff --git a/source/blender/editors/gpencil/gpencil_add_monkey.c b/source/blender/editors/gpencil/gpencil_add_monkey.c
index bc046e89d21..00066d5f2b8 100644
--- a/source/blender/editors/gpencil/gpencil_add_monkey.c
+++ b/source/blender/editors/gpencil/gpencil_add_monkey.c
@@ -19,6 +19,8 @@
 #include "BKE_main.h"
 #include "BKE_material.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 
 #include "ED_gpencil.h"
@@ -54,7 +56,7 @@ static int gpencil_monkey_color(
     Main *bmain, Object *ob, const ColorTemplate *pct, bool stroke, bool fill)
 {
   int index;
-  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, pct->name, &index);
+  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, DATA_(pct->name), &index);
 
   copy_v4_v4(ma->gp_style->stroke_rgba, pct->line);
   srgb_to_linearrgb_v4(ma->gp_style->stroke_rgba, ma->gp_style->stroke_rgba);
@@ -781,37 +783,37 @@ static const float data27[33 * GP_PRIM_DATABUF_SIZE] = {
 /* Monkey Color Data */
 
 static const ColorTemplate gp_monkey_pct_black = {
-    "Black",
+    N_("Black"),
     {0.0f, 0.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_monkey_pct_skin = {
-    "Skin",
+    N_("Skin"),
     {0.733f, 0.569f, 0.361f, 1.0f},
     {0.745f, 0.502f, 0.278f, 1.0f},
 };
 
 static const ColorTemplate gp_monkey_pct_skin_light = {
-    "Skin_Light",
+    N_("Skin_Light"),
     {0.914f, 0.827f, 0.635f, 1.0f},
     {0.913f, 0.828f, 0.637f, 0.0f},
 };
 
 static const ColorTemplate gp_monkey_pct_skin_shadow = {
-    "Skin_Shadow",
+    N_("Skin_Shadow"),
     {0.322f, 0.29f, 0.224f, 0.5f},
     {0.32f, 0.29f, 0.223f, 0.3f},
 };
 
 static const ColorTemplate gp_monkey_pct_eyes = {
-    "Eyes",
+    N_("Eyes"),
     {0.553f, 0.39f, 0.266f, 0.0f},
     {0.847f, 0.723f, 0.599f, 1.0f},
 };
 
 static const ColorTemplate gp_monkey_pct_pupils = {
-    "Pupils",
+    N_("Pupils"),
     {0.0f, 0.0f, 0.0f, 0.0f},
     {0.0f, 0.0f, 0.0f, 1.0f},
 };
@@ -821,6 +823,8 @@ static const ColorTemplate gp_monkey_pct_pupils = {
 
 void ED_gpencil_create_monkey(bContext *C, Object *ob, float mat[4][4])
 {
+  /* Original model created by Matias Mendiola. */
+
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   bGPdata *gpd = (bGPdata *)ob->data;
diff --git a/source/blender/editors/gpencil/gpencil_add_stroke.c b/source/blender/editors/gpencil/gpencil_add_stroke.c
index e24964c4832..8522c81cb39 100644
--- a/source/blender/editors/gpencil/gpencil_add_stroke.c
+++ b/source/blender/editors/gpencil/gpencil_add_stroke.c
@@ -19,6 +19,8 @@
 #include "BKE_main.h"
 #include "BKE_material.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 
 #include "ED_gpencil.h"
@@ -37,7 +39,7 @@ static int gpencil_stroke_material(Main *bmain,
                                    const bool fill)
 {
   int index;
-  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, pct->name, &index);
+  Material *ma = BKE_gpencil_object_material_ensure_by_name(bmain, ob, DATA_(pct->name), &index);
 
   copy_v4_v4(ma->gp_style->stroke_rgba, pct->line);
   srgb_to_linearrgb_v4(ma->gp_style->stroke_rgba, ma->gp_style->stroke_rgba);
@@ -150,37 +152,37 @@ static const float data0[175 * GP_PRIM_DATABUF_SIZE] = {
 /* Color Data */
 
 static const ColorTemplate gp_stroke_material_black = {
-    "Black",
+    N_("Black"),
     {0.0f, 0.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_stroke_material_white = {
-    "White",
+    N_("White"),
     {1.0f, 1.0f, 1.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_stroke_material_red = {
-    "Red",
+    N_("Red"),
     {1.0f, 0.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_stroke_material_green = {
-    "Green",
+    N_("Green"),
     {0.0f, 1.0f, 0.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_stroke_material_blue = {
-    "Blue",
+    N_("Blue"),
     {0.0f, 0.0f, 1.0f, 1.0f},
     {0.0f, 0.0f, 0.0f, 0.0f},
 };
 
 static const ColorTemplate gp_stroke_material_grey = {
-    "Grey",
+    N_("Grey"),
     {0.358f, 0.358f, 0.358f, 1.0f},
     {0.5f, 0.5f, 0.5f, 1.0f},
 };
@@ -190,6 +192,8 @@ static const ColorTemplate gp_stroke_material_grey = {
 
 void ED_gpencil_create_stroke(bContext *C, Object *ob, float mat[4][4])
 {
+  /* Original design created by Daniel M. Lara and Matias Mendiola. */
+
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   bGPdata *gpd = (bGPdata *)ob->data;
diff --git a/source/blender/editors/gpencil/gpencil_armature.c b/source/blender/editors/gpencil/gpencil_armature.c
index d389f7eb5dd..5f5a4b41b27 100644
--- a/source/blender/editors/gpencil/gpencil_armature.c
+++ b/source/blender/editors/gpencil/gpencil_armature.c
@@ -29,6 +29,7 @@
 #include "BKE_deform.h"
 #include "BKE_gpencil.h"
 #include "BKE_gpencil_modifier.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_object_deform.h"
 #include "BKE_report.h"
@@ -528,6 +529,7 @@ static bool gpencil_generate_weights_poll(bContext *C)
     return false;
   }
 
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bGPdata *gpd = (bGPdata *)ob->data;
 
@@ -536,7 +538,8 @@ static bool gpencil_generate_weights_poll(bContext *C)
   }
 
   /* need some armature in the view layer */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->object->type == OB_ARMATURE) {
       return true;
     }
@@ -548,6 +551,7 @@ static bool gpencil_generate_weights_poll(bContext *C)
 static int gpencil_generate_weights_exec(bContext *C, wmOperator *op)
 {
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob = CTX_data_active_object(C);
   Object *ob_eval = DEG_get_evaluated_object(depsgraph, ob);
@@ -566,7 +570,8 @@ static int gpencil_generate_weights_exec(bContext *C, wmOperator *op)
   /* get armature */
   const int arm_idx = RNA_enum_get(op->ptr, "armature");
   if (arm_idx > 0) {
-    Base *base = BLI_findlink(&view_layer->object_bases, arm_idx - 1);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Base *base = BLI_findlink(BKE_view_layer_object_bases_get(view_layer), arm_idx - 1);
     ob_arm = base->object;
   }
   else {
@@ -607,6 +612,7 @@ static const EnumPropertyItem *gpencil_armatures_enum_itemf(bContext *C,
                                                             PropertyRNA *UNUSED(prop),
                                                             bool *r_free)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   EnumPropertyItem *item = NULL, item_tmp = {0};
   int totitem = 0;
@@ -623,7 +629,8 @@ static const EnumPropertyItem *gpencil_armatures_enum_itemf(bContext *C,
   RNA_enum_item_add(&item, &totitem, &item_tmp);
   i++;
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     Object *ob = base->object;
     if (ob->type == OB_ARMATURE) {
       item_tmp.identifier = item_tmp.name = ob->id.name + 2;
diff --git a/source/blender/editors/gpencil/gpencil_bake_animation.cc b/source/blender/editors/gpencil/gpencil_bake_animation.cc
index e480852a9bb..28d4e1c6d42 100644
--- a/source/blender/editors/gpencil/gpencil_bake_animation.cc
+++ b/source/blender/editors/gpencil/gpencil_bake_animation.cc
@@ -327,7 +327,7 @@ static int gpencil_bake_grease_pencil_animation_exec(bContext *C, wmOperator *op
           /* Reproject stroke. */
           if (project_type != GP_REPROJECT_KEEP) {
             ED_gpencil_stroke_reproject(
-                depsgraph, &gsc, sctx, gpl_dst, gpf_dst, gps, project_type, false);
+                depsgraph, &gsc, sctx, gpl_dst, gpf_dst, gps, project_type, false, 0.0f);
           }
           else {
             BKE_gpencil_stroke_geometry_update(gpd_dst, gps);
diff --git a/source/blender/editors/gpencil/gpencil_convert.c b/source/blender/editors/gpencil/gpencil_convert.c
index 25b5466e260..bf78111a636 100644
--- a/source/blender/editors/gpencil/gpencil_convert.c
+++ b/source/blender/editors/gpencil/gpencil_convert.c
@@ -588,7 +588,7 @@ static void gpencil_stroke_path_animation(bContext *C,
   }
 
   /* As we used INSERTKEY_FAST mode, we need to recompute all curve's handles now */
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 
   WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME | NA_EDITED, NULL);
 
@@ -1303,6 +1303,7 @@ static void gpencil_layer_to_curve(bContext *C,
   ob = BKE_object_add_only_object(bmain, OB_CURVES_LEGACY, gpl->info);
   cu = ob->data = BKE_curve_add(bmain, gpl->info, OB_CURVES_LEGACY);
   BKE_collection_object_add(bmain, collection, ob);
+  BKE_view_layer_synced_ensure(scene, view_layer);
   base_new = BKE_view_layer_base_find(view_layer, ob);
   DEG_relations_tag_update(bmain); /* added object */
 
diff --git a/source/blender/editors/gpencil/gpencil_data.c b/source/blender/editors/gpencil/gpencil_data.c
index b7ac73b9692..340288b2d74 100644
--- a/source/blender/editors/gpencil/gpencil_data.c
+++ b/source/blender/editors/gpencil/gpencil_data.c
@@ -2076,6 +2076,9 @@ static void gpencil_brush_delete_mode_brushes(Main *bmain,
     }
 
     BKE_brush_delete(bmain, brush);
+    if (brush == brush_active) {
+      brush_active = NULL;
+    }
   }
 }
 
@@ -2109,8 +2112,8 @@ static int gpencil_brush_reset_all_exec(bContext *C, wmOperator *UNUSED(op))
 
   char tool = '0';
   if (paint) {
-    Brush *brush_active = paint->brush;
-    if (brush_active) {
+    if (paint->brush) {
+      Brush *brush_active = paint->brush;
       switch (mode) {
         case CTX_MODE_PAINT_GPENCIL: {
           tool = brush_active->gpencil_tool;
diff --git a/source/blender/editors/gpencil/gpencil_edit.c b/source/blender/editors/gpencil/gpencil_edit.c
index 06f3c169fa9..837a9390b6c 100644
--- a/source/blender/editors/gpencil/gpencil_edit.c
+++ b/source/blender/editors/gpencil/gpencil_edit.c
@@ -67,6 +67,7 @@
 
 #include "ED_armature.h"
 #include "ED_gpencil.h"
+#include "ED_keyframing.h"
 #include "ED_object.h"
 #include "ED_outliner.h"
 #include "ED_screen.h"
@@ -1713,12 +1714,17 @@ static int gpencil_strokes_paste_exec(bContext *C, wmOperator *op)
           }
         }
 
-        /* Ensure we have a frame to draw into
+        /* Ensure we have a frame to draw into.
          * NOTE: Since this is an op which creates strokes,
-         *       we are obliged to add a new frame if one
-         *       doesn't exist already
+         *       we reuse active frame or add a new frame if one
+         *       doesn't exist already depending on REC button status.
          */
-        gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_ADD_NEW);
+        if (IS_AUTOKEY_ON(scene) || (gpl->actframe == NULL)) {
+          gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_ADD_NEW);
+        }
+        else {
+          gpf = BKE_gpencil_layer_frame_get(gpl, scene->r.cfra, GP_GETFRAME_USE_PREV);
+        }
         if (gpf) {
           /* Create new stroke */
           bGPDstroke *new_stroke = BKE_gpencil_stroke_duplicate(gps, true, true);
@@ -3395,6 +3401,7 @@ static int gpencil_stroke_caps_set_exec(bContext *C, wmOperator *op)
   bGPdata *gpd = ED_gpencil_data_get_active(C);
   Object *ob = CTX_data_active_object(C);
   const int type = RNA_enum_get(op->ptr, "type");
+  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
 
   /* sanity checks */
   if (ELEM(NULL, gpd)) {
@@ -3404,46 +3411,57 @@ static int gpencil_stroke_caps_set_exec(bContext *C, wmOperator *op)
   bool changed = false;
   /* loop all selected strokes */
   CTX_DATA_BEGIN (C, bGPDlayer *, gpl, editable_gpencil_layers) {
-    if (gpl->actframe == NULL) {
-      continue;
-    }
+    bGPDframe *init_gpf = (is_multiedit) ? gpl->frames.first : gpl->actframe;
 
-    for (bGPDstroke *gps = gpl->actframe->strokes.last; gps; gps = gps->prev) {
-      MaterialGPencilStyle *gp_style = BKE_gpencil_material_settings(ob, gps->mat_nr + 1);
+    for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
+      if ((gpf == gpl->actframe) || ((gpf->flag & GP_FRAME_SELECT) && (is_multiedit))) {
+        if (gpf == NULL) {
+          continue;
+        }
 
-      /* skip strokes that are not selected or invalid for current view */
-      if (((gps->flag & GP_STROKE_SELECT) == 0) || (ED_gpencil_stroke_can_use(C, gps) == false)) {
-        continue;
-      }
-      /* skip hidden or locked colors */
-      if (!gp_style || (gp_style->flag & GP_MATERIAL_HIDE) ||
-          (gp_style->flag & GP_MATERIAL_LOCKED)) {
-        continue;
-      }
+        for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
+          MaterialGPencilStyle *gp_style = BKE_gpencil_material_settings(ob, gps->mat_nr + 1);
 
-      short prev_first = gps->caps[0];
-      short prev_last = gps->caps[1];
+          /* skip strokes that are not selected or invalid for current view */
+          if (((gps->flag & GP_STROKE_SELECT) == 0) ||
+              (ED_gpencil_stroke_can_use(C, gps) == false)) {
+            continue;
+          }
+          /* skip hidden or locked colors */
+          if (!gp_style || (gp_style->flag & GP_MATERIAL_HIDE) ||
+              (gp_style->flag & GP_MATERIAL_LOCKED)) {
+            continue;
+          }
+
+          short prev_first = gps->caps[0];
+          short prev_last = gps->caps[1];
+
+          if (ELEM(type, GP_STROKE_CAPS_TOGGLE_BOTH, GP_STROKE_CAPS_TOGGLE_START)) {
+            ++gps->caps[0];
+            if (gps->caps[0] >= GP_STROKE_CAP_MAX) {
+              gps->caps[0] = GP_STROKE_CAP_ROUND;
+            }
+          }
+          if (ELEM(type, GP_STROKE_CAPS_TOGGLE_BOTH, GP_STROKE_CAPS_TOGGLE_END)) {
+            ++gps->caps[1];
+            if (gps->caps[1] >= GP_STROKE_CAP_MAX) {
+              gps->caps[1] = GP_STROKE_CAP_ROUND;
+            }
+          }
+          if (type == GP_STROKE_CAPS_TOGGLE_DEFAULT) {
+            gps->caps[0] = GP_STROKE_CAP_ROUND;
+            gps->caps[1] = GP_STROKE_CAP_ROUND;
+          }
 
-      if (ELEM(type, GP_STROKE_CAPS_TOGGLE_BOTH, GP_STROKE_CAPS_TOGGLE_START)) {
-        ++gps->caps[0];
-        if (gps->caps[0] >= GP_STROKE_CAP_MAX) {
-          gps->caps[0] = GP_STROKE_CAP_ROUND;
+          if (prev_first != gps->caps[0] || prev_last != gps->caps[1]) {
+            changed = true;
+          }
         }
-      }
-      if (ELEM(type, GP_STROKE_CAPS_TOGGLE_BOTH, GP_STROKE_CAPS_TOGGLE_END)) {
-        ++gps->caps[1];
-        if (gps->caps[1] >= GP_STROKE_CAP_MAX) {
-          gps->caps[1] = GP_STROKE_CAP_ROUND;
+        /* If not multi-edit, exit loop. */
+        if (!is_multiedit) {
+          break;
         }
       }
-      if (type == GP_STROKE_CAPS_TOGGLE_DEFAULT) {
-        gps->caps[0] = GP_STROKE_CAP_ROUND;
-        gps->caps[1] = GP_STROKE_CAP_ROUND;
-      }
-
-      if (prev_first != gps->caps[0] || prev_last != gps->caps[1]) {
-        changed = true;
-      }
     }
   }
   CTX_DATA_END;
@@ -3550,9 +3568,9 @@ static int gpencil_stroke_join_exec(bContext *C, wmOperator *op)
   bGPdata *gpd = ED_gpencil_data_get_active(C);
   bGPDlayer *activegpl = BKE_gpencil_layer_active_get(gpd);
   Object *ob = CTX_data_active_object(C);
-  /* Limit the number of strokes to join. It makes no sense to allow an very high number of strokes
-   * for CPU time and because to have a stroke with thousands of points is unpractical, so limit
-   * this number avoid to joining a full frame scene in one single stroke. */
+  /* Limit the number of strokes to join. It makes no sense to allow an very high number of
+   * strokes for CPU time and because to have a stroke with thousands of points is unpractical,
+   * so limit this number avoid to joining a full frame scene in one single stroke. */
   const int max_join_strokes = 128;
 
   const int type = RNA_enum_get(op->ptr, "type");
@@ -3638,7 +3656,7 @@ static int gpencil_stroke_join_exec(bContext *C, wmOperator *op)
     }
     elem = &strokes_list[i];
     /* Join new_stroke and stroke B. */
-    BKE_gpencil_stroke_join(gps_new, elem->gps, leave_gaps, true, false);
+    BKE_gpencil_stroke_join(gps_new, elem->gps, leave_gaps, true, false, true);
     elem->used = true;
   }
 
@@ -3709,35 +3727,44 @@ static int gpencil_stroke_flip_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
+  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
   const bool is_curve_edit = (bool)GPENCIL_CURVE_EDIT_SESSIONS_ON(gpd);
+
   bool changed = false;
-  /* read all selected strokes */
+  /* Read all selected strokes. */
   CTX_DATA_BEGIN (C, bGPDlayer *, gpl, editable_gpencil_layers) {
-    bGPDframe *gpf = gpl->actframe;
-    if (gpf == NULL) {
-      continue;
-    }
+    bGPDframe *init_gpf = (is_multiedit) ? gpl->frames.first : gpl->actframe;
 
-    LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
-      if (gps->flag & GP_STROKE_SELECT) {
-        /* skip strokes that are invalid for current view */
-        if (ED_gpencil_stroke_can_use(C, gps) == false) {
-          continue;
-        }
-        /* check if the color is editable */
-        if (ED_gpencil_stroke_material_editable(ob, gpl, gps) == false) {
+    for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
+      if ((gpf == gpl->actframe) || ((gpf->flag & GP_FRAME_SELECT) && (is_multiedit))) {
+        if (gpf == NULL) {
           continue;
         }
+        LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
+          if (gps->flag & GP_STROKE_SELECT) {
+            /* skip strokes that are invalid for current view */
+            if (ED_gpencil_stroke_can_use(C, gps) == false) {
+              continue;
+            }
+            /* check if the color is editable */
+            if (ED_gpencil_stroke_material_editable(ob, gpl, gps) == false) {
+              continue;
+            }
 
-        if (is_curve_edit) {
-          BKE_report(op->reports, RPT_ERROR, "Not implemented!");
-        }
-        else {
-          /* Flip stroke. */
-          BKE_gpencil_stroke_flip(gps);
+            if (is_curve_edit) {
+              BKE_report(op->reports, RPT_ERROR, "Not implemented!");
+            }
+            else {
+              /* Flip stroke. */
+              BKE_gpencil_stroke_flip(gps);
+              changed = true;
+            }
+          }
         }
-
-        changed = true;
+      }
+      /* If not multi-edit, exit loop. */
+      if (!is_multiedit) {
+        break;
       }
     }
   }
@@ -3770,6 +3797,101 @@ void GPENCIL_OT_stroke_flip(wmOperatorType *ot)
 /** \} */
 
 /* -------------------------------------------------------------------- */
+/** \name Stroke Start Set Operator
+ * \{ */
+
+static int gpencil_stroke_start_set_exec(bContext *C, wmOperator *op)
+{
+  Object *ob = CTX_data_active_object(C);
+  bGPdata *gpd = ob->data;
+
+  /* sanity checks */
+  if (ELEM(NULL, ob, gpd)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
+  const bool is_curve_edit = (bool)GPENCIL_CURVE_EDIT_SESSIONS_ON(gpd);
+  if (is_curve_edit) {
+    BKE_report(op->reports, RPT_ERROR, "Curve Edit mode not supported");
+    return OPERATOR_CANCELLED;
+  }
+
+  bool changed = false;
+  /* Read all selected strokes. */
+  CTX_DATA_BEGIN (C, bGPDlayer *, gpl, editable_gpencil_layers) {
+    bGPDframe *init_gpf = (is_multiedit) ? gpl->frames.first : gpl->actframe;
+
+    for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
+      if ((gpf == gpl->actframe) || ((gpf->flag & GP_FRAME_SELECT) && (is_multiedit))) {
+        if (gpf == NULL) {
+          continue;
+        }
+        LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
+          if (gps->flag & GP_STROKE_SELECT) {
+            /* skip strokes that are invalid for current view */
+            if (ED_gpencil_stroke_can_use(C, gps) == false) {
+              continue;
+            }
+            /* check if the color is editable */
+            if (ED_gpencil_stroke_material_editable(ob, gpl, gps) == false) {
+              continue;
+            }
+
+            /* Only cyclic strokes. */
+            if ((gps->flag & GP_STROKE_CYCLIC) == 0) {
+              continue;
+            }
+
+            /* Find first selected point and set start. */
+            bGPDspoint *pt;
+            for (int i = 0; i < gps->totpoints; i++) {
+              pt = &gps->points[i];
+              if (pt->flag & GP_SPOINT_SELECT) {
+                BKE_gpencil_stroke_start_set(gps, i);
+                BKE_gpencil_stroke_geometry_update(gpd, gps);
+                changed = true;
+                break;
+              }
+            }
+          }
+        }
+      }
+      /* If not multi-edit, exit loop. */
+      if (!is_multiedit) {
+        break;
+      }
+    }
+  }
+  CTX_DATA_END;
+
+  if (changed) {
+    /* notifiers */
+    DEG_id_tag_update(&gpd->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
+    WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+  }
+
+  return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_start_set(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Set Start Point";
+  ot->idname = "GPENCIL_OT_stroke_start_set";
+  ot->description = "Set start point for cyclic strokes";
+
+  /* api callbacks */
+  ot->exec = gpencil_stroke_start_set_exec;
+  ot->poll = gpencil_active_layer_poll;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
 /** \name Stroke Re-project Operator
  * \{ */
 
@@ -3783,6 +3905,7 @@ static int gpencil_strokes_reproject_exec(bContext *C, wmOperator *op)
   const bool keep_original = RNA_boolean_get(op->ptr, "keep_original");
   const bool is_curve_edit = (bool)GPENCIL_CURVE_EDIT_SESSIONS_ON(gpd);
   const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
+  const float offset = RNA_float_get(op->ptr, "offset");
 
   /* Init snap context for geometry projection. */
   SnapObjectContext *sctx = NULL;
@@ -3822,7 +3945,8 @@ static int gpencil_strokes_reproject_exec(bContext *C, wmOperator *op)
               BKE_scene_graph_update_for_newframe(depsgraph);
             }
 
-            ED_gpencil_stroke_reproject(depsgraph, &gsc, sctx, gpl, gpf, gps, mode, keep_original);
+            ED_gpencil_stroke_reproject(
+                depsgraph, &gsc, sctx, gpl, gpf, gps, mode, keep_original, offset);
 
             if (is_curve_edit && gps->editcurve != NULL) {
               BKE_gpencil_stroke_editcurve_update(gpd, gpl, gps);
@@ -3862,8 +3986,29 @@ static int gpencil_strokes_reproject_exec(bContext *C, wmOperator *op)
   return OPERATOR_FINISHED;
 }
 
+static void gpencil_strokes_reproject_ui(bContext *UNUSED(C), wmOperator *op)
+{
+  uiLayout *layout = op->layout;
+  uiLayout *row;
+
+  const eGP_ReprojectModes type = RNA_enum_get(op->ptr, "type");
+
+  uiLayoutSetPropSep(layout, true);
+  uiLayoutSetPropDecorate(layout, false);
+  row = uiLayoutRow(layout, true);
+  uiItemR(row, op->ptr, "type", 0, NULL, ICON_NONE);
+
+  if (type == GP_REPROJECT_SURFACE) {
+    row = uiLayoutRow(layout, true);
+    uiItemR(row, op->ptr, "offset", 0, NULL, ICON_NONE);
+  }
+  row = uiLayoutRow(layout, true);
+  uiItemR(row, op->ptr, "keep_original", 0, NULL, ICON_NONE);
+}
+
 void GPENCIL_OT_reproject(wmOperatorType *ot)
 {
+  PropertyRNA *prop;
   static const EnumPropertyItem reproject_type[] = {
       {GP_REPROJECT_FRONT, "FRONT", 0, "Front", "Reproject the strokes using the X-Z plane"},
       {GP_REPROJECT_SIDE, "SIDE", 0, "Side", "Reproject the strokes using the Y-Z plane"},
@@ -3901,6 +4046,7 @@ void GPENCIL_OT_reproject(wmOperatorType *ot)
   ot->invoke = WM_menu_invoke;
   ot->exec = gpencil_strokes_reproject_exec;
   ot->poll = gpencil_strokes_edit3d_poll;
+  ot->ui = gpencil_strokes_reproject_ui;
 
   /* flags */
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
@@ -3909,12 +4055,15 @@ void GPENCIL_OT_reproject(wmOperatorType *ot)
   ot->prop = RNA_def_enum(
       ot->srna, "type", reproject_type, GP_REPROJECT_VIEW, "Projection Type", "");
 
-  RNA_def_boolean(
+  prop = RNA_def_boolean(
       ot->srna,
       "keep_original",
       0,
       "Keep Original",
       "Keep original strokes and create a copy before reprojecting instead of reproject them");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_MOVIECLIP);
+
+  RNA_def_float(ot->srna, "offset", 0.0f, 0.0f, 10.0f, "Surface Offset", "", 0.0f, 10.0f);
 }
 
 static int gpencil_recalc_geometry_exec(bContext *C, wmOperator *UNUSED(op))
@@ -3939,6 +4088,284 @@ static int gpencil_recalc_geometry_exec(bContext *C, wmOperator *UNUSED(op))
   return OPERATOR_FINISHED;
 }
 
+/* -------------------------------------------------------------------- */
+/** \name Stroke Perimeter from View Operator
+ * \{ */
+
+enum {
+  GP_PERIMETER_VIEW = 0,
+  GP_PERIMETER_FRONT = 1,
+  GP_PERIMETER_SIDE = 2,
+  GP_PERIMETER_TOP = 3,
+  GP_PERIMETER_CAMERA = 4,
+};
+
+enum {
+  GP_STROKE_USE_ACTIVE_MATERIAL = 0,
+  GP_STROKE_USE_CURRENT_MATERIAL = 1,
+  GP_STROKE_USE_NEW_MATERIAL = 2,
+};
+
+static int gpencil_stroke_outline_exec(bContext *C, wmOperator *op)
+{
+  Main *bmain = CTX_data_main(C);
+  RegionView3D *rv3d = CTX_wm_region_view3d(C);
+  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  Object *ob = CTX_data_active_object(C);
+  bGPdata *gpd = (bGPdata *)ob->data;
+  const int subdivisions = RNA_int_get(op->ptr, "subdivisions");
+  const float length = RNA_float_get(op->ptr, "length");
+  const bool keep = RNA_boolean_get(op->ptr, "keep");
+  const int thickness = RNA_int_get(op->ptr, "thickness");
+
+  const int view_mode = RNA_enum_get(op->ptr, "view_mode");
+  const int material_mode = RNA_enum_get(op->ptr, "material_mode");
+  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
+
+  /* sanity checks */
+  if (ELEM(NULL, gpd)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  bool changed = false;
+
+  float viewmat[4][4];
+  copy_m4_m4(viewmat, rv3d->viewmat);
+
+  switch (view_mode) {
+    case GP_PERIMETER_FRONT:
+      unit_m4(rv3d->viewmat);
+      viewmat[1][1] = 0.0f;
+      viewmat[1][2] = -1.0f;
+
+      viewmat[2][1] = 1.0f;
+      viewmat[2][2] = 0.0f;
+
+      viewmat[3][2] = -10.0f;
+      break;
+    case GP_PERIMETER_SIDE:
+      zero_m4(viewmat);
+      viewmat[0][2] = 1.0f;
+      viewmat[1][0] = 1.0f;
+      viewmat[2][1] = 1.0f;
+      viewmat[3][3] = 1.0f;
+      break;
+    case GP_PERIMETER_TOP:
+      unit_m4(viewmat);
+      break;
+    case GP_PERIMETER_CAMERA: {
+      Scene *scene = CTX_data_scene(C);
+      Object *cam_ob = scene->camera;
+      if (cam_ob != NULL) {
+        invert_m4_m4(viewmat, cam_ob->obmat);
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
+  /* Untag strokes to be sure nothing is pending. */
+  LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+    LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
+      LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
+        gps->flag &= ~GP_STROKE_TAG;
+      }
+    }
+  }
+  /* Create a new material. */
+  int mat_idx = 0;
+  if (material_mode == GP_STROKE_USE_NEW_MATERIAL) {
+    Material *ma = BKE_gpencil_object_material_new(bmain, ob, "Material", NULL);
+    MaterialGPencilStyle *gp_style = ma->gp_style;
+
+    gp_style->flag |= GP_MATERIAL_FILL_SHOW;
+    mat_idx = ob->totcol - 1;
+  }
+
+  /* loop all selected strokes */
+  LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+    if (gpl->flag & GP_LAYER_HIDE) {
+      continue;
+    }
+    /* Prepare transform matrix. */
+    float diff_mat[4][4];
+    BKE_gpencil_layer_transform_matrix_get(depsgraph, ob, gpl, diff_mat);
+
+    bGPDframe *init_gpf = (is_multiedit) ? gpl->frames.first : gpl->actframe;
+
+    for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
+      if ((gpf == gpl->actframe) || ((gpf->flag & GP_FRAME_SELECT) && (is_multiedit))) {
+        if (gpf == NULL) {
+          continue;
+        }
+
+        for (bGPDstroke *gps = gpf->strokes.first; gps; gps = gps->next) {
+          if ((gps->flag & GP_STROKE_SELECT) == 0) {
+            continue;
+          }
+          if (gps->totpoints == 0) {
+            continue;
+          }
+          if (!ED_gpencil_stroke_material_visible(ob, gps)) {
+            continue;
+          }
+
+          MaterialGPencilStyle *gp_style = BKE_gpencil_material_settings(ob, gps->mat_nr + 1);
+          const bool is_stroke = ((gp_style->flag & GP_MATERIAL_STROKE_SHOW) != 0);
+
+          if (!is_stroke) {
+            continue;
+          }
+
+          /* Duplicate the stroke to apply any layer thickness change. */
+          bGPDstroke *gps_duplicate = BKE_gpencil_stroke_duplicate(gps, true, false);
+
+          /* Apply layer thickness change. */
+          gps_duplicate->thickness += gpl->line_change;
+          /* Apply object scale to thickness. */
+          gps_duplicate->thickness *= mat4_to_scale(ob->obmat);
+          CLAMP_MIN(gps_duplicate->thickness, 1.0f);
+
+          /* Stroke. */
+          const float ovr_thickness = keep ? thickness : 0.0f;
+          bGPDstroke *gps_perimeter = BKE_gpencil_stroke_perimeter_from_view(
+              viewmat, gpd, gpl, gps_duplicate, subdivisions, diff_mat, ovr_thickness);
+          gps_perimeter->flag &= ~GP_STROKE_SELECT;
+          /* Assign material. */
+          switch (material_mode) {
+            case GP_STROKE_USE_ACTIVE_MATERIAL: {
+              if (ob->actcol - 1 < 0) {
+                gps_perimeter->mat_nr = 0;
+              }
+              else {
+                gps_perimeter->mat_nr = ob->actcol - 1;
+              }
+              break;
+            }
+            case GP_STROKE_USE_CURRENT_MATERIAL:
+              gps_perimeter->mat_nr = gps->mat_nr;
+              break;
+            case GP_STROKE_USE_NEW_MATERIAL:
+              gps_perimeter->mat_nr = mat_idx;
+              break;
+            default:
+              break;
+          }
+
+          /* Sample stroke. */
+          if (length > 0.0f) {
+            BKE_gpencil_stroke_sample(gpd, gps_perimeter, length, false, 0);
+          }
+          /* Set stroke thickness. */
+          gps_perimeter->thickness = thickness;
+
+          /* Set pressure constant. */
+          bGPDspoint *pt;
+          for (int i = 0; i < gps_perimeter->totpoints; i++) {
+            pt = &gps_perimeter->points[i];
+            pt->pressure = 1.0f;
+          }
+
+          /* Add perimeter stroke to frame. */
+          BLI_insertlinkafter(&gpf->strokes, gps, gps_perimeter);
+
+          /* Tag original stroke to be removed. */
+          gps->flag |= GP_STROKE_TAG;
+
+          /* Free Temp stroke. */
+          BKE_gpencil_free_stroke(gps_duplicate);
+          changed = true;
+        }
+
+        /* If not multi-edit, exit loop. */
+        if (!is_multiedit) {
+          break;
+        }
+      }
+    }
+  }
+  /* Free old strokes. */
+  LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+    LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
+      LISTBASE_FOREACH_MUTABLE (bGPDstroke *, gps, &gpf->strokes) {
+        if (gps->flag & GP_STROKE_TAG) {
+          BLI_remlink(&gpf->strokes, gps);
+          BKE_gpencil_free_stroke(gps);
+        }
+      }
+    }
+  }
+
+  if (changed) {
+    /* notifiers */
+    DEG_id_tag_update(&gpd->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
+    WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
+  }
+
+  return OPERATOR_FINISHED;
+}
+
+void GPENCIL_OT_stroke_outline(wmOperatorType *ot)
+{
+  static const EnumPropertyItem view_mode[] = {
+      {GP_PERIMETER_VIEW, "VIEW", 0, "View", ""},
+      {GP_PERIMETER_FRONT, "FRONT", 0, "Front", ""},
+      {GP_PERIMETER_SIDE, "SIDE", 0, "Side", ""},
+      {GP_PERIMETER_TOP, "TOP", 0, "Top", ""},
+      {GP_PERIMETER_CAMERA, "CAMERA", 0, "Camera", ""},
+      {0, NULL, 0, NULL, NULL},
+  };
+  static const EnumPropertyItem material_mode[] = {
+      {GP_STROKE_USE_ACTIVE_MATERIAL, "ACTIVE", 0, "Active Material", ""},
+      {GP_STROKE_USE_CURRENT_MATERIAL, "KEEP", 0, "Keep Material", "Keep current stroke material"},
+      {GP_STROKE_USE_NEW_MATERIAL, "NEW", 0, "New Material", ""},
+      {0, NULL, 0, NULL, NULL},
+  };
+
+  /* identifiers */
+  ot->name = "Convert Stroke to Outline";
+  ot->idname = "GPENCIL_OT_stroke_outline";
+  ot->description = "Convert stroke to perimeter";
+
+  /* api callbacks */
+  ot->exec = gpencil_stroke_outline_exec;
+  ot->poll = gpencil_stroke_edit_poll;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  /* properties */
+  ot->prop = RNA_def_enum(ot->srna, "view_mode", view_mode, GP_PERIMETER_VIEW, "View", "");
+  RNA_def_enum(ot->srna,
+               "material_mode",
+               material_mode,
+               GP_STROKE_USE_ACTIVE_MATERIAL,
+               "Material Mode",
+               "");
+
+  RNA_def_int(ot->srna,
+              "thickness",
+              1,
+              1,
+              1000,
+              "Thickness",
+              "Thickness of the stroke perimeter",
+              1,
+              1000);
+  RNA_def_boolean(ot->srna,
+                  "keep",
+                  true,
+                  "Keep Shape",
+                  "Try to keep global shape when the stroke thickness change");
+
+  RNA_def_int(ot->srna, "subdivisions", 3, 0, 10, "Subdivisions", "", 0, 10);
+
+  RNA_def_float(ot->srna, "length", 0.0f, 0.0f, 100.0f, "Sample Length", "", 0.0f, 100.0f);
+}
+
+/** \} */
+
 void GPENCIL_OT_recalc_geometry(wmOperatorType *ot)
 {
   /* identifiers */
@@ -3980,6 +4407,7 @@ static void gpencil_smooth_stroke(bContext *C, wmOperator *op)
       /* TODO use `BKE_gpencil_stroke_smooth` when the weights are better used. */
       bGPDstroke gps_old = *gps;
       gps_old.points = (bGPDspoint *)MEM_dupallocN(gps->points);
+      bool need_update = false;
       /* Here the iteration needs to be done outside the smooth functions,
        * as there are points that don't get smoothed. */
       for (int n = 0; n < repeat; n++) {
@@ -3991,6 +4419,7 @@ static void gpencil_smooth_stroke(bContext *C, wmOperator *op)
           /* Perform smoothing. */
           if (smooth_position) {
             BKE_gpencil_stroke_smooth_point(&gps_old, i, factor, 1, false, false, gps);
+            need_update = true;
           }
           if (smooth_strength) {
             BKE_gpencil_stroke_smooth_strength(&gps_old, i, factor, 1, gps);
@@ -4000,6 +4429,7 @@ static void gpencil_smooth_stroke(bContext *C, wmOperator *op)
           }
           if (smooth_uv) {
             BKE_gpencil_stroke_smooth_uv(&gps_old, i, factor, 1, gps);
+            need_update = true;
           }
         }
         if (n < repeat - 1) {
@@ -4007,6 +4437,11 @@ static void gpencil_smooth_stroke(bContext *C, wmOperator *op)
         }
       }
       MEM_freeN(gps_old.points);
+
+      if (need_update) {
+        gps->flag |= GP_STROKE_NEEDS_CURVE_UPDATE;
+        BKE_gpencil_stroke_geometry_update(gpd_, gps);
+      }
     }
   }
   GP_EDITABLE_STROKES_END(gpstroke_iter);
@@ -4454,6 +4889,8 @@ void GPENCIL_OT_stroke_sample(wmOperatorType *ot)
 
   /* properties */
   prop = RNA_def_float(ot->srna, "length", 0.1f, 0.0f, 100.0f, "Length", "", 0.0f, 100.0f);
+  prop = RNA_def_float(
+      ot->srna, "sharp_threshold", 0.1f, 0.0f, M_PI, "Sharp Threshold", "", 0.0f, M_PI);
   /* avoid re-using last var */
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
diff --git a/source/blender/editors/gpencil/gpencil_fill.c b/source/blender/editors/gpencil/gpencil_fill.c
index 5305c764b3a..34f983151d2 100644
--- a/source/blender/editors/gpencil/gpencil_fill.c
+++ b/source/blender/editors/gpencil/gpencil_fill.c
@@ -67,6 +67,7 @@
 
 #define LEAK_HORZ 0
 #define LEAK_VERT 1
+#define FILL_LEAK 3.0f
 #define MIN_WINDOW_SIZE 128
 
 /* Set to 1 to debug filling internal image. By default, the value must be 0. */
@@ -140,6 +141,8 @@ typedef struct tGPDfill {
   int fill_simplylvl;
   /** boundary limits drawing mode */
   int fill_draw_mode;
+  /** types of extensions **/
+  int fill_extend_mode;
   /* scaling factor */
   float fill_factor;
 
@@ -197,7 +200,8 @@ static void gpencil_delete_temp_stroke_extension(tGPDfill *tgpf, const bool all_
     for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
       LISTBASE_FOREACH_MUTABLE (bGPDstroke *, gps, &gpf->strokes) {
         /* free stroke */
-        if ((gps->flag & GP_STROKE_NOFILL) && (gps->flag & GP_STROKE_TAG)) {
+        if ((gps->flag & GP_STROKE_NOFILL) &&
+            (gps->flag & GP_STROKE_TAG || gps->flag & GP_STROKE_HELP)) {
           BLI_remlink(&gpf->strokes, gps);
           BKE_gpencil_free_stroke(gps);
         }
@@ -209,6 +213,64 @@ static void gpencil_delete_temp_stroke_extension(tGPDfill *tgpf, const bool all_
   }
 }
 
+static bool extended_bbox_overlap(
+    float min1[3], float max1[3], float min2[3], float max2[3], float extend)
+{
+  for (int axis = 0; axis < 3; axis++) {
+    float intersection_min = max_ff(min1[axis], min2[axis]) - extend;
+    float intersection_max = min_ff(max1[axis], max2[axis]) + extend;
+    if (intersection_min > intersection_max) {
+      return false;
+    }
+  }
+  return true;
+}
+
+static void add_stroke_extension(bGPDframe *gpf, bGPDstroke *gps, float p1[3], float p2[3])
+{
+  bGPDstroke *gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
+  gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
+  BLI_addtail(&gpf->strokes, gps_new);
+
+  bGPDspoint *pt = &gps_new->points[0];
+  copy_v3_v3(&pt->x, p1);
+  pt->strength = 1.0f;
+  pt->pressure = 1.0f;
+
+  pt = &gps_new->points[1];
+  copy_v3_v3(&pt->x, p2);
+  pt->strength = 1.0f;
+  pt->pressure = 1.0f;
+}
+
+static void add_endpoint_radius_help(bGPDframe *gpf,
+                                     bGPDstroke *gps,
+                                     const float endpoint[3],
+                                     const float radius,
+                                     const bool focused)
+{
+  float circumference = 2.0f * M_PI * radius;
+  float vertex_spacing = 0.005f;
+  int num_vertices = min_ii(max_ii((int)ceilf(circumference / vertex_spacing), 3), 40);
+
+  bGPDstroke *gps_new = BKE_gpencil_stroke_new(gps->mat_nr, num_vertices, gps->thickness);
+  gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_CYCLIC | GP_STROKE_HELP;
+  if (focused) {
+    gps_new->flag |= GP_STROKE_TAG;
+  }
+  BLI_addtail(&gpf->strokes, gps_new);
+
+  for (int i = 0; i < num_vertices; i++) {
+    float angle = ((float)i / (float)num_vertices) * 2.0f * M_PI;
+    bGPDspoint *pt = &gps_new->points[i];
+    pt->x = endpoint[0] + radius * cosf(angle);
+    pt->y = endpoint[1];
+    pt->z = endpoint[2] + radius * sinf(angle);
+    pt->strength = 1.0f;
+    pt->pressure = 1.0f;
+  }
+}
+
 static void extrapolate_points_by_length(bGPDspoint *a,
                                          bGPDspoint *b,
                                          float length,
@@ -221,6 +283,99 @@ static void extrapolate_points_by_length(bGPDspoint *a,
   add_v3_v3v3(r_point, &b->x, ab);
 }
 
+/* Cut the extended lines if collide. */
+static void gpencil_cut_extensions(tGPDfill *tgpf, const int gpl_active_index)
+{
+  bGPdata *gpd = tgpf->gpd;
+  Brush *brush = tgpf->brush;
+  BrushGpencilSettings *brush_settings = brush->gpencil_settings;
+
+  LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+    if (gpl->flag & GP_LAYER_HIDE) {
+      continue;
+    }
+
+    /* Decide if the strokes of layers are included or not depending on the layer mode. */
+    const int gpl_index = BLI_findindex(&gpd->layers, gpl);
+    bool skip = skip_layer_check(brush_settings->fill_layer_mode, gpl_active_index, gpl_index);
+    if (skip) {
+      continue;
+    }
+
+    bGPDframe *gpf = BKE_gpencil_layer_frame_get(gpl, tgpf->active_cfra, GP_GETFRAME_USE_PREV);
+    if (gpf == NULL) {
+      continue;
+    }
+    int size = BLI_listbase_count(&gpf->strokes);
+    if (size == 0) {
+      continue;
+    }
+
+    float diff_mat[4][4];
+    BKE_gpencil_layer_transform_matrix_get(tgpf->depsgraph, tgpf->ob, gpl, diff_mat);
+    /* Save all extend strokes in array.*/
+    int tot_idx = 0;
+    bGPDstroke **gps_array = MEM_callocN(sizeof(bGPDstroke *) * size, __func__);
+
+    LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
+      if ((gps->flag & (GP_STROKE_NOFILL | GP_STROKE_TAG)) == 0) {
+        continue;
+      }
+      gps_array[tot_idx] = gps;
+      tot_idx++;
+    }
+
+    /* Compare all strokes. */
+    for (int i = 0; i < tot_idx; i++) {
+      bGPDstroke *gps_a = gps_array[i];
+
+      bGPDspoint pt2;
+      float a1xy[2], a2xy[2];
+      float b1xy[2], b2xy[2];
+
+      /* First stroke. */
+      bGPDspoint *pt = &gps_a->points[0];
+      gpencil_point_to_parent_space(pt, diff_mat, &pt2);
+      gpencil_point_to_xy_fl(&tgpf->gsc, gps_a, &pt2, &a1xy[0], &a1xy[1]);
+
+      pt = &gps_a->points[1];
+      gpencil_point_to_parent_space(pt, diff_mat, &pt2);
+      gpencil_point_to_xy_fl(&tgpf->gsc, gps_a, &pt2, &a2xy[0], &a2xy[1]);
+      bGPDspoint *extreme_a = &gps_a->points[1];
+
+      /* Loop all strokes. */
+      for (int z = 0; z < tot_idx; z++) {
+        bGPDstroke *gps_b = gps_array[z];
+        if (i == z) {
+          continue;
+        }
+        pt = &gps_b->points[0];
+        gpencil_point_to_parent_space(pt, diff_mat, &pt2);
+        gpencil_point_to_xy_fl(&tgpf->gsc, gps_b, &pt2, &b1xy[0], &b1xy[1]);
+
+        pt = &gps_b->points[1];
+        gpencil_point_to_parent_space(pt, diff_mat, &pt2);
+        gpencil_point_to_xy_fl(&tgpf->gsc, gps_b, &pt2, &b2xy[0], &b2xy[1]);
+        bGPDspoint *extreme_b = &gps_b->points[1];
+
+        /* Check if extensions collide and cut the overlength. */
+        if (isect_seg_seg_v2_simple(a1xy, a2xy, b1xy, b2xy)) {
+          float intersection[2];
+          isect_line_line_v2_point(a1xy, a2xy, b1xy, b2xy, intersection);
+          float intersection3D[3];
+          gpencil_point_xy_to_3d(&tgpf->gsc, tgpf->scene, intersection, intersection3D);
+          copy_v3_v3(&extreme_a->x, intersection3D);
+          copy_v3_v3(&extreme_b->x, intersection3D);
+          gps_a->flag |= GP_STROKE_COLLIDE;
+          gps_b->flag |= GP_STROKE_COLLIDE;
+        }
+      }
+    }
+
+    MEM_SAFE_FREE(gps_array);
+  }
+}
+
 /* Loop all layers create stroke extensions. */
 static void gpencil_create_extensions(tGPDfill *tgpf)
 {
@@ -235,6 +390,9 @@ static void gpencil_create_extensions(tGPDfill *tgpf)
   const int gpl_active_index = BLI_findindex(&gpd->layers, gpl_active);
   BLI_assert(gpl_active_index >= 0);
 
+  float connection_dist = tgpf->fill_extend_fac * 0.1f;
+  GSet *connected_endpoints = BLI_gset_ptr_new(__func__);
+
   LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
     if (gpl->flag & GP_LAYER_HIDE) {
       continue;
@@ -266,41 +424,163 @@ static void gpencil_create_extensions(tGPDfill *tgpf)
         continue;
       }
 
-      /* Extend start. */
-      bGPDspoint *pt0 = &gps->points[1];
-      bGPDspoint *pt1 = &gps->points[0];
-      bGPDstroke *gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
-      gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
-      BLI_addtail(&gpf->strokes, gps_new);
-
-      bGPDspoint *pt = &gps_new->points[0];
-      copy_v3_v3(&pt->x, &pt1->x);
-      pt->strength = 1.0f;
-      pt->pressure = 1.0f;
-
-      pt = &gps_new->points[1];
-      pt->strength = 1.0f;
-      pt->pressure = 1.0f;
-      extrapolate_points_by_length(pt0, pt1, tgpf->fill_extend_fac * 0.1f, &pt->x);
-
-      /* Extend end. */
-      pt0 = &gps->points[gps->totpoints - 2];
-      pt1 = &gps->points[gps->totpoints - 1];
-      gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
-      gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
-      BLI_addtail(&gpf->strokes, gps_new);
-
-      pt = &gps_new->points[0];
-      copy_v3_v3(&pt->x, &pt1->x);
-      pt->strength = 1.0f;
-      pt->pressure = 1.0f;
-
-      pt = &gps_new->points[1];
-      pt->strength = 1.0f;
-      pt->pressure = 1.0f;
-      extrapolate_points_by_length(pt0, pt1, tgpf->fill_extend_fac * 0.1f, &pt->x);
+      /* Find points of high curvature. */
+      float tan1[3];
+      float tan2[3];
+      float d1;
+      float d2;
+      float total_length = 0.f;
+      for (int i = 1; i < gps->totpoints; i++) {
+        if (i > 1) {
+          copy_v3_v3(tan1, tan2);
+          d1 = d2;
+        }
+        bGPDspoint *pt1 = &gps->points[i - 1];
+        bGPDspoint *pt2 = &gps->points[i];
+        sub_v3_v3v3(tan2, &pt2->x, &pt1->x);
+        d2 = normalize_v3(tan2);
+        total_length += d2;
+        if (i > 1) {
+          if (tgpf->fill_extend_mode == GP_FILL_EMODE_RADIUS) {
+            continue;
+          }
+          float curvature[3];
+          sub_v3_v3v3(curvature, tan2, tan1);
+          float k = normalize_v3(curvature);
+          k /= min_ff(d1, d2);
+          float radius = 1.f / k;
+          /*
+           * The smaller the radius of curvature, the sharper the corner.
+           * The thicker the line, the larger the radius of curvature it
+           * takes to be visually indistinguishable from an endpoint.
+           */
+          float min_radius = gps->thickness * 0.0001f;
+
+          if (radius < min_radius) {
+            /* Extend along direction of curvature. */
+            bGPDstroke *gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
+            gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
+            BLI_addtail(&gpf->strokes, gps_new);
+
+            bGPDspoint *pt = &gps_new->points[0];
+            copy_v3_v3(&pt->x, &pt1->x);
+            pt->strength = 1.0f;
+            pt->pressure = 1.0f;
+
+            pt = &gps_new->points[1];
+            pt->strength = 1.0f;
+            pt->pressure = 1.0f;
+            mul_v3_fl(curvature, -connection_dist);
+            add_v3_v3v3(&pt->x, &pt1->x, curvature);
+          }
+        }
+      }
+
+      if (tgpf->fill_extend_mode != GP_FILL_EMODE_RADIUS) {
+        /* Extend start. */
+        bGPDspoint *pt0 = &gps->points[1];
+        bGPDspoint *pt1 = &gps->points[0];
+        bGPDstroke *gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
+        gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
+        BLI_addtail(&gpf->strokes, gps_new);
+
+        bGPDspoint *pt = &gps_new->points[0];
+        copy_v3_v3(&pt->x, &pt1->x);
+        pt->strength = 1.0f;
+        pt->pressure = 1.0f;
+
+        pt = &gps_new->points[1];
+        pt->strength = 1.0f;
+        pt->pressure = 1.0f;
+        extrapolate_points_by_length(pt0, pt1, connection_dist, &pt->x);
+
+        /* Extend end. */
+        pt0 = &gps->points[gps->totpoints - 2];
+        pt1 = &gps->points[gps->totpoints - 1];
+        gps_new = BKE_gpencil_stroke_new(gps->mat_nr, 2, gps->thickness);
+        gps_new->flag |= GP_STROKE_NOFILL | GP_STROKE_TAG;
+        BLI_addtail(&gpf->strokes, gps_new);
+
+        pt = &gps_new->points[0];
+        copy_v3_v3(&pt->x, &pt1->x);
+        pt->strength = 1.0f;
+        pt->pressure = 1.0f;
+
+        pt = &gps_new->points[1];
+        pt->strength = 1.0f;
+        pt->pressure = 1.0f;
+        extrapolate_points_by_length(pt0, pt1, connection_dist, &pt->x);
+      }
+
+      /* Connect endpoints within a radius */
+      if (tgpf->fill_extend_mode == GP_FILL_EMODE_EXTEND) {
+        continue;
+      }
+      float *stroke1_start = &gps->points[0].x;
+      float *stroke1_end = &gps->points[gps->totpoints - 1].x;
+      /* Connect the start of the stroke to its own end if the whole stroke
+       * isn't already so short that it's within that distance
+       */
+      if (len_v3v3(stroke1_start, stroke1_end) < connection_dist &&
+          total_length > connection_dist) {
+        add_stroke_extension(gpf, gps, stroke1_start, stroke1_end);
+        BLI_gset_add(connected_endpoints, stroke1_start);
+        BLI_gset_add(connected_endpoints, stroke1_end);
+      }
+      for (bGPDstroke *gps2 = (bGPDstroke *)(((Link *)gps)->next); gps2 != NULL;
+           gps2 = (bGPDstroke *)(((Link *)gps2)->next)) {
+        /* Don't check distance to temporary extensions. */
+        if ((gps2->flag & GP_STROKE_NOFILL) && (gps2->flag & GP_STROKE_TAG)) {
+          continue;
+        }
+
+        /* Don't check endpoint distances unless the bounding boxes of the strokes
+        are close enough together that they can plausibly be connected. */
+        if (!extended_bbox_overlap(gps->boundbox_min,
+                                   gps->boundbox_max,
+                                   gps2->boundbox_min,
+                                   gps2->boundbox_max,
+                                   connection_dist)) {
+          continue;
+        }
+
+        float *stroke2_start = &gps2->points[0].x;
+        float *stroke2_end = &gps2->points[gps2->totpoints - 1].x;
+        if (len_v3v3(stroke1_start, stroke2_start) < connection_dist) {
+          add_stroke_extension(gpf, gps, stroke1_start, stroke2_start);
+          BLI_gset_add(connected_endpoints, stroke1_start);
+          BLI_gset_add(connected_endpoints, stroke2_start);
+        }
+        if (len_v3v3(stroke1_start, stroke2_end) < connection_dist) {
+          add_stroke_extension(gpf, gps, stroke1_start, stroke2_end);
+          BLI_gset_add(connected_endpoints, stroke1_start);
+          BLI_gset_add(connected_endpoints, stroke2_end);
+        }
+        if (len_v3v3(stroke1_end, stroke2_start) < connection_dist) {
+          add_stroke_extension(gpf, gps, stroke1_end, stroke2_start);
+          BLI_gset_add(connected_endpoints, stroke1_end);
+          BLI_gset_add(connected_endpoints, stroke2_start);
+        }
+        if (len_v3v3(stroke1_end, stroke2_end) < connection_dist) {
+          add_stroke_extension(gpf, gps, stroke1_end, stroke2_end);
+          BLI_gset_add(connected_endpoints, stroke1_end);
+          BLI_gset_add(connected_endpoints, stroke2_end);
+        }
+      }
+
+      bool start_connected = BLI_gset_haskey(connected_endpoints, stroke1_start);
+      bool end_connected = BLI_gset_haskey(connected_endpoints, stroke1_end);
+      add_endpoint_radius_help(gpf, gps, stroke1_start, connection_dist, start_connected);
+      add_endpoint_radius_help(gpf, gps, stroke1_end, connection_dist, end_connected);
     }
   }
+
+  BLI_gset_free(connected_endpoints, NULL);
+
+  /* Cut overlength strokes. */
+  if (tgpf->fill_extend_mode == GP_FILL_EMODE_EXTEND) {
+    gpencil_cut_extensions(tgpf, gpl_active_index);
+  }
 }
 
 static void gpencil_update_extend(tGPDfill *tgpf)
@@ -322,15 +602,16 @@ static bool gpencil_stroke_is_drawable(tGPDfill *tgpf, bGPDstroke *gps)
   const bool show_help = (tgpf->flag & GP_BRUSH_FILL_SHOW_HELPLINES) != 0;
   const bool show_extend = (tgpf->flag & GP_BRUSH_FILL_SHOW_EXTENDLINES) != 0;
   const bool is_extend = (gps->flag & GP_STROKE_NOFILL) && (gps->flag & GP_STROKE_TAG);
+  const bool is_extend_help = (gps->flag & GP_STROKE_NOFILL) && (gps->flag & GP_STROKE_HELP);
 
   if ((!show_help) && (show_extend)) {
-    if (!is_extend) {
+    if (!is_extend && !is_extend_help) {
       return false;
     }
   }
 
   if ((show_help) && (!show_extend)) {
-    if (is_extend) {
+    if (is_extend || is_extend_help) {
       return false;
     }
   }
@@ -357,14 +638,35 @@ static void gpencil_draw_basic_stroke(tGPDfill *tgpf,
   float fpt[3];
   float col[4];
   const float extend_col[4] = {0.0f, 1.0f, 1.0f, 1.0f};
-  const bool is_extend = (gps->flag & GP_STROKE_NOFILL) && (gps->flag & GP_STROKE_TAG);
+  const float help_col[4] = {1.0f, 0.0f, 0.5f, 1.0f};
+  const bool is_extend = (gps->flag & GP_STROKE_NOFILL) && (gps->flag & GP_STROKE_TAG) &&
+                         !(gps->flag & GP_STROKE_HELP);
+  const bool is_help = gps->flag & GP_STROKE_HELP;
 
   if (!gpencil_stroke_is_drawable(tgpf, gps)) {
     return;
   }
 
-  if ((is_extend) && (!tgpf->is_render)) {
-    copy_v4_v4(col, extend_col);
+  if (is_help && tgpf->is_render) {
+    /* Help strokes are for display only and shouldn't render. */
+    return;
+  }
+  else if (is_help) {
+    /* Color help strokes that won't affect fill or render separately from
+     * extended strokes, as they will affect them. */
+    copy_v4_v4(col, help_col);
+
+    /* If there is contact, hide the circles to avoid noise and keep the focus
+     * in the pending gaps. */
+    col[3] = (gps->flag & GP_STROKE_TAG) ? 0.0f : 0.5f;
+  }
+  else if ((is_extend) && (!tgpf->is_render)) {
+    if ((gps->flag & GP_STROKE_COLLIDE) || (tgpf->fill_extend_mode == GP_FILL_EMODE_RADIUS)) {
+      copy_v4_v4(col, extend_col);
+    }
+    else {
+      copy_v4_v4(col, help_col);
+    }
   }
   else {
     copy_v4_v4(col, ink);
@@ -379,7 +681,7 @@ static void gpencil_draw_basic_stroke(tGPDfill *tgpf,
   immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
 
   /* draw stroke curve */
-  GPU_line_width((!is_extend) ? thickness : thickness * 2.0f);
+  GPU_line_width((!is_extend && !is_help) ? thickness : thickness * 2.0f);
   immBeginAtMost(GPU_PRIM_LINE_STRIP, totpoints + cyclic_add);
   const bGPDspoint *pt = points;
 
@@ -390,7 +692,7 @@ static void gpencil_draw_basic_stroke(tGPDfill *tgpf,
       CLAMP(alpha, 0.0f, 1.0f);
       col[3] = alpha <= thershold ? 0.0f : 1.0f;
     }
-    else {
+    else if (!is_help) {
       col[3] = 1.0f;
     }
     /* set point */
@@ -582,7 +884,8 @@ static void gpencil_draw_datablock(tGPDfill *tgpf, const float ink[4])
 
       /* Normal strokes. */
       if (ELEM(tgpf->fill_draw_mode, GP_FILL_DMODE_STROKE, GP_FILL_DMODE_BOTH)) {
-        if (gpencil_stroke_is_drawable(tgpf, gps) && ((gps->flag & GP_STROKE_TAG) == 0)) {
+        if (gpencil_stroke_is_drawable(tgpf, gps) && ((gps->flag & GP_STROKE_TAG) == 0) &&
+            ((gps->flag & GP_STROKE_HELP) == 0)) {
           ED_gpencil_draw_fill(&tgpw);
         }
       }
@@ -1777,10 +2080,11 @@ static tGPDfill *gpencil_session_init_fill(bContext *C, wmOperator *op)
   tgpf->fill_threshold = brush->gpencil_settings->fill_threshold;
   tgpf->fill_simplylvl = brush->gpencil_settings->fill_simplylvl;
   tgpf->fill_draw_mode = brush->gpencil_settings->fill_draw_mode;
+  tgpf->fill_extend_mode = brush->gpencil_settings->fill_extend_mode;
   tgpf->fill_extend_fac = brush->gpencil_settings->fill_extend_fac;
   tgpf->fill_factor = max_ff(GPENCIL_MIN_FILL_FAC,
                              min_ff(brush->gpencil_settings->fill_factor, GPENCIL_MAX_FILL_FAC));
-  tgpf->fill_leak = (int)ceil((float)brush->gpencil_settings->fill_leak * tgpf->fill_factor);
+  tgpf->fill_leak = (int)ceil(FILL_LEAK * tgpf->fill_factor);
 
   int totcol = tgpf->ob->totcol;
 
diff --git a/source/blender/editors/gpencil/gpencil_intern.h b/source/blender/editors/gpencil/gpencil_intern.h
index d656241c463..4d62f834d86 100644
--- a/source/blender/editors/gpencil/gpencil_intern.h
+++ b/source/blender/editors/gpencil/gpencil_intern.h
@@ -593,6 +593,7 @@ void GPENCIL_OT_stroke_cyclical_set(struct wmOperatorType *ot);
  */
 void GPENCIL_OT_stroke_caps_set(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_join(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_start_set(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_flip(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_subdivide(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_simplify(struct wmOperatorType *ot);
@@ -608,6 +609,7 @@ void GPENCIL_OT_stroke_merge_by_distance(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_merge_material(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_reset_vertex_color(struct wmOperatorType *ot);
 void GPENCIL_OT_stroke_normalize(struct wmOperatorType *ot);
+void GPENCIL_OT_stroke_outline(struct wmOperatorType *ot);
 
 void GPENCIL_OT_material_to_vertex_color(struct wmOperatorType *ot);
 void GPENCIL_OT_extract_palette_vertex(struct wmOperatorType *ot);
diff --git a/source/blender/editors/gpencil/gpencil_interpolate.c b/source/blender/editors/gpencil/gpencil_interpolate.c
index e7a4f2fe2dc..dc63acf5136 100644
--- a/source/blender/editors/gpencil/gpencil_interpolate.c
+++ b/source/blender/editors/gpencil/gpencil_interpolate.c
@@ -1483,7 +1483,8 @@ void GPENCIL_OT_interpolate_sequence(wmOperatorType *ot)
    */
   static const EnumPropertyItem gpencil_interpolation_type_items[] = {
       /* Interpolation. */
-      RNA_ENUM_ITEM_HEADING(N_("Interpolation"), "Standard transitions between keyframes"),
+      RNA_ENUM_ITEM_HEADING(CTX_N_(BLT_I18NCONTEXT_ID_GPENCIL, "Interpolation"),
+                            N_("Standard transitions between keyframes")),
       {GP_IPO_LINEAR,
        "LINEAR",
        ICON_IPO_LINEAR,
@@ -1496,9 +1497,9 @@ void GPENCIL_OT_interpolate_sequence(wmOperatorType *ot)
        "Custom interpolation defined using a curve map"},
 
       /* Easing. */
-      RNA_ENUM_ITEM_HEADING(N_("Easing (by strength)"),
-                            "Predefined inertial transitions, useful for motion graphics "
-                            "(from least to most \"dramatic\")"),
+      RNA_ENUM_ITEM_HEADING(CTX_N_(BLT_I18NCONTEXT_ID_GPENCIL, "Easing (by strength)"),
+                            N_("Predefined inertial transitions, useful for motion graphics "
+                               "(from least to most \"dramatic\")")),
       {GP_IPO_SINE,
        "SINE",
        ICON_IPO_SINE,
@@ -1515,7 +1516,8 @@ void GPENCIL_OT_interpolate_sequence(wmOperatorType *ot)
        "Circular",
        "Circular easing (strongest and most dynamic)"},
 
-      RNA_ENUM_ITEM_HEADING(N_("Dynamic Effects"), "Simple physics-inspired easing effects"),
+      RNA_ENUM_ITEM_HEADING(CTX_N_(BLT_I18NCONTEXT_ID_GPENCIL, "Dynamic Effects"),
+                            N_("Simple physics-inspired easing effects")),
       {GP_IPO_BACK, "BACK", ICON_IPO_BACK, "Back", "Cubic easing with overshoot and settle"},
       {GP_IPO_BOUNCE,
        "BOUNCE",
@@ -1569,6 +1571,7 @@ void GPENCIL_OT_interpolate_sequence(wmOperatorType *ot)
   /* identifiers */
   ot->name = "Interpolate Sequence";
   ot->idname = "GPENCIL_OT_interpolate_sequence";
+  ot->translation_context = BLT_I18NCONTEXT_ID_GPENCIL;
   ot->description = "Generate 'in-betweens' to smoothly interpolate between Grease Pencil frames";
 
   /* api callbacks */
diff --git a/source/blender/editors/gpencil/gpencil_mesh.cc b/source/blender/editors/gpencil/gpencil_mesh.cc
index b27e1c75746..739a1b319c3 100644
--- a/source/blender/editors/gpencil/gpencil_mesh.cc
+++ b/source/blender/editors/gpencil/gpencil_mesh.cc
@@ -213,7 +213,7 @@ static int gpencil_bake_mesh_animation_exec(bContext *C, wmOperator *op)
   bool newob = false;
 
   if (target == GP_TARGET_OB_SELECTED) {
-    ob_gpencil = BKE_view_layer_non_active_selected_object(CTX_data_view_layer(C), v3d);
+    ob_gpencil = BKE_view_layer_non_active_selected_object(scene, CTX_data_view_layer(C), v3d);
     if (ob_gpencil != nullptr) {
       if (ob_gpencil->type != OB_GPENCIL) {
         BKE_report(op->reports, RPT_WARNING, "Target object not a grease pencil, ignoring!");
@@ -315,7 +315,7 @@ static int gpencil_bake_mesh_animation_exec(bContext *C, wmOperator *op)
           LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
             if ((gps->flag & GP_STROKE_TAG) == 0) {
               ED_gpencil_stroke_reproject(
-                  depsgraph, &gsc, sctx, gpl, gpf, gps, project_type, false);
+                  depsgraph, &gsc, sctx, gpl, gpf, gps, project_type, false, 0.0f);
               gps->flag |= GP_STROKE_TAG;
             }
           }
diff --git a/source/blender/editors/gpencil/gpencil_ops.c b/source/blender/editors/gpencil/gpencil_ops.c
index 99e28270c3e..85cc281ca90 100644
--- a/source/blender/editors/gpencil/gpencil_ops.c
+++ b/source/blender/editors/gpencil/gpencil_ops.c
@@ -621,6 +621,7 @@ void ED_operatortypes_gpencil(void)
   WM_operatortype_append(GPENCIL_OT_stroke_caps_set);
   WM_operatortype_append(GPENCIL_OT_stroke_join);
   WM_operatortype_append(GPENCIL_OT_stroke_flip);
+  WM_operatortype_append(GPENCIL_OT_stroke_start_set);
   WM_operatortype_append(GPENCIL_OT_stroke_subdivide);
   WM_operatortype_append(GPENCIL_OT_stroke_simplify);
   WM_operatortype_append(GPENCIL_OT_stroke_simplify_fixed);
@@ -635,6 +636,7 @@ void ED_operatortypes_gpencil(void)
   WM_operatortype_append(GPENCIL_OT_stroke_merge_material);
   WM_operatortype_append(GPENCIL_OT_stroke_reset_vertex_color);
   WM_operatortype_append(GPENCIL_OT_stroke_normalize);
+  WM_operatortype_append(GPENCIL_OT_stroke_outline);
 
   WM_operatortype_append(GPENCIL_OT_material_to_vertex_color);
   WM_operatortype_append(GPENCIL_OT_extract_palette_vertex);
diff --git a/source/blender/editors/gpencil/gpencil_ops_versioning.c b/source/blender/editors/gpencil/gpencil_ops_versioning.c
index 8119646137c..50fbafff732 100644
--- a/source/blender/editors/gpencil/gpencil_ops_versioning.c
+++ b/source/blender/editors/gpencil/gpencil_ops_versioning.c
@@ -92,7 +92,7 @@ static int gpencil_convert_old_files_exec(bContext *C, wmOperator *op)
   if ((!is_annotation) && (view_layer != NULL)) {
     Object *ob;
     ob = BKE_object_add_for_data(
-        bmain, view_layer, OB_GPENCIL, "GP_Scene", &scene->gpd->id, false);
+        bmain, scene, view_layer, OB_GPENCIL, "GP_Scene", &scene->gpd->id, false);
     zero_v3(ob->loc);
     DEG_relations_tag_update(bmain); /* added object */
 
diff --git a/source/blender/editors/gpencil/gpencil_paint.c b/source/blender/editors/gpencil/gpencil_paint.c
index 70486138556..7446c727a0c 100644
--- a/source/blender/editors/gpencil/gpencil_paint.c
+++ b/source/blender/editors/gpencil/gpencil_paint.c
@@ -918,6 +918,67 @@ static void gpencil_stroke_unselect(bGPdata *gpd, bGPDstroke *gps)
   }
 }
 
+static bGPDstroke *gpencil_stroke_to_outline(tGPsdata *p, bGPDstroke *gps)
+{
+  bGPDlayer *gpl = p->gpl;
+  RegionView3D *rv3d = p->region->regiondata;
+  Brush *brush = p->brush;
+  BrushGpencilSettings *gpencil_settings = brush->gpencil_settings;
+  MaterialGPencilStyle *gp_style = BKE_gpencil_material_settings(p->ob, gps->mat_nr + 1);
+  const bool is_stroke = ((gp_style->flag & GP_MATERIAL_STROKE_SHOW) != 0);
+
+  if (!is_stroke) {
+    return gps;
+  }
+
+  /* Duplicate the stroke to apply any layer thickness change. */
+  bGPDstroke *gps_duplicate = BKE_gpencil_stroke_duplicate(gps, true, false);
+
+  /* Apply layer thickness change. */
+  gps_duplicate->thickness += gpl->line_change;
+  /* Apply object scale to thickness. */
+  gps_duplicate->thickness *= mat4_to_scale(p->ob->obmat);
+  CLAMP_MIN(gps_duplicate->thickness, 1.0f);
+
+  /* Stroke. */
+  float diff_mat[4][4];
+  unit_m4(diff_mat);
+  const float outline_thickness = (float)brush->size * gpencil_settings->outline_fac * 0.5f;
+  bGPDstroke *gps_perimeter = BKE_gpencil_stroke_perimeter_from_view(
+      rv3d->viewmat, p->gpd, gpl, gps_duplicate, 3, diff_mat, outline_thickness);
+  /* Assign material. */
+  if (gpencil_settings->material_alt == NULL) {
+    gps_perimeter->mat_nr = gps->mat_nr;
+  }
+  else {
+    Material *ma = gpencil_settings->material_alt;
+    int mat_idx = BKE_gpencil_material_find_index_by_name_prefix(p->ob, ma->id.name + 2);
+    if (mat_idx > -1) {
+      gps_perimeter->mat_nr = mat_idx;
+    }
+    else {
+      gps_perimeter->mat_nr = gps->mat_nr;
+    }
+  }
+
+  /* Set pressure constant. */
+  gps_perimeter->thickness = max_ii((int)outline_thickness, 1);
+
+  bGPDspoint *pt;
+  for (int i = 0; i < gps_perimeter->totpoints; i++) {
+    pt = &gps_perimeter->points[i];
+    pt->pressure = 1.0f;
+  }
+
+  /* Remove original stroke. */
+  BKE_gpencil_free_stroke(gps);
+
+  /* Free Temp stroke. */
+  BKE_gpencil_free_stroke(gps_duplicate);
+
+  return gps_perimeter;
+}
+
 /* make a new stroke from the buffer data */
 static void gpencil_stroke_newfrombuffer(tGPsdata *p)
 {
@@ -1221,6 +1282,23 @@ static void gpencil_stroke_newfrombuffer(tGPsdata *p)
       BKE_gpencil_stroke_simplify_adaptive(gpd, gps, brush->gpencil_settings->simplify_f);
     }
 
+    /* Set material index. */
+    gps->mat_nr = BKE_gpencil_object_material_get_index_from_brush(p->ob, p->brush);
+    if (gps->mat_nr < 0) {
+      if (p->ob->actcol - 1 < 0) {
+        gps->mat_nr = 0;
+      }
+      else {
+        gps->mat_nr = p->ob->actcol - 1;
+      }
+    }
+
+    /* Convert to Outline. */
+    if ((brush->gpencil_settings->flag & GP_BRUSH_GROUP_SETTINGS) &&
+        (brush->gpencil_settings->flag & GP_BRUSH_OUTLINE_STROKE)) {
+      gps = gpencil_stroke_to_outline(p, gps);
+    }
+
     /* reproject to plane (only in 3d space) */
     gpencil_reproject_toplane(p, gps);
     /* change position relative to parent object */
@@ -1235,17 +1313,6 @@ static void gpencil_stroke_newfrombuffer(tGPsdata *p)
     }
   }
 
-  /* Save material index */
-  gps->mat_nr = BKE_gpencil_object_material_get_index_from_brush(p->ob, p->brush);
-  if (gps->mat_nr < 0) {
-    if (p->ob->actcol - 1 < 0) {
-      gps->mat_nr = 0;
-    }
-    else {
-      gps->mat_nr = p->ob->actcol - 1;
-    }
-  }
-
   /* add stroke to frame, usually on tail of the listbase, but if on back is enabled the stroke
    * is added on listbase head because the drawing order is inverse and the head stroke is the
    * first to draw. This is very useful for artist when drawing the background.
@@ -2343,7 +2410,7 @@ static void gpencil_draw_eraser(bContext *UNUSED(C), int x, int y, void *p_ptr)
   if (p->paintmode == GP_PAINTMODE_ERASER) {
     GPUVertFormat *format = immVertexFormat();
     const uint shdr_pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     GPU_line_smooth(true);
     GPU_blend(GPU_BLEND_ALPHA);
@@ -2353,7 +2420,7 @@ static void gpencil_draw_eraser(bContext *UNUSED(C), int x, int y, void *p_ptr)
 
     immUnbindProgram();
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -3264,7 +3331,7 @@ static int gpencil_draw_invoke(bContext *C, wmOperator *op, const wmEvent *event
   return OPERATOR_RUNNING_MODAL;
 }
 
-/* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
+/* gpencil modal operator stores area, which can be removed while using it (like full-screen). */
 static bool gpencil_area_exists(bContext *C, ScrArea *area_test)
 {
   bScreen *screen = CTX_wm_screen(C);
@@ -3658,9 +3725,7 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
     }
   }
 
-  /* Exit painting mode (and/or end current stroke).
-   *
-   */
+  /* Exit painting mode (and/or end current stroke). */
   if (ELEM(event->type, EVT_RETKEY, EVT_PADENTER, EVT_ESCKEY, EVT_SPACEKEY)) {
 
     p->status = GP_STATUS_DONE;
@@ -3755,7 +3820,7 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
   /* handle mode-specific events */
   if (p->status == GP_STATUS_PAINTING) {
     /* handle painting mouse-movements? */
-    if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE) || (p->flags & GP_PAINTFLAG_FIRSTRUN)) {
+    if (ISMOUSE_MOTION(event->type) || (p->flags & GP_PAINTFLAG_FIRSTRUN)) {
       /* handle drawing event */
       bool is_speed_guide = ((guide->use_guide) &&
                              (p->brush && (p->brush->gpencil_tool == GPAINT_TOOL_DRAW)));
@@ -3823,7 +3888,7 @@ static int gpencil_draw_modal(bContext *C, wmOperator *op, const wmEvent *event)
     }
   }
 
-  /* gpencil modal operator stores area, which can be removed while using it (like fullscreen) */
+  /* gpencil modal operator stores area, which can be removed while using it (like full-screen). */
   if (0 == gpencil_area_exists(C, p->area)) {
     estate = OPERATOR_CANCELLED;
   }
diff --git a/source/blender/editors/gpencil/gpencil_primitive.c b/source/blender/editors/gpencil/gpencil_primitive.c
index befff611d58..4a4fffc9638 100644
--- a/source/blender/editors/gpencil/gpencil_primitive.c
+++ b/source/blender/editors/gpencil/gpencil_primitive.c
@@ -1024,8 +1024,10 @@ static void gpencil_primitive_update_strokes(bContext *C, tGPDprimitive *tgpi)
         gpd->runtime.sbuffer, &gpd->runtime.sbuffer_size, &gpd->runtime.sbuffer_used, false);
 
     /* add small offset to keep stroke over the surface */
-    if ((depth_arr) && (gpd->zdepth_offset > 0.0f) && (depth_arr[i] != DEPTH_INVALID)) {
-      depth_arr[i] *= (1.0f - (gpd->zdepth_offset / 1000.0f));
+    if (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_VIEW) {
+      if ((depth_arr) && (gpd->zdepth_offset > 0.0f) && (depth_arr[i] != DEPTH_INVALID)) {
+        depth_arr[i] *= (1.0f - (gpd->zdepth_offset / 1000.0f));
+      }
     }
 
     /* convert screen-coordinates to 3D coordinates */
@@ -1107,7 +1109,7 @@ static void gpencil_primitive_update(bContext *C, wmOperator *op, tGPDprimitive
 /* Initialize mouse points. */
 static void gpencil_primitive_interaction_begin(tGPDprimitive *tgpi, const wmEvent *event)
 {
-  copy_v2fl_v2i(tgpi->mval, event->mval);
+  WM_event_drag_start_mval_fl(event, tgpi->region, tgpi->mval);
   copy_v2_v2(tgpi->origin, tgpi->mval);
   copy_v2_v2(tgpi->start, tgpi->mval);
   copy_v2_v2(tgpi->end, tgpi->mval);
diff --git a/source/blender/editors/gpencil/gpencil_sculpt_paint.c b/source/blender/editors/gpencil/gpencil_sculpt_paint.c
index e27cd255217..52e6200978c 100644
--- a/source/blender/editors/gpencil/gpencil_sculpt_paint.c
+++ b/source/blender/editors/gpencil/gpencil_sculpt_paint.c
@@ -516,7 +516,7 @@ static void gpencil_brush_grab_calc_dvec(tGP_BrushEditData *gso)
 
   float mval_f[2];
 
-  /* convert from 2D screenspace to 3D... */
+  /* Convert from 2D screen-space to 3D. */
   mval_f[0] = (float)(gso->mval[0] - gso->mval_prev[0]);
   mval_f[1] = (float)(gso->mval[1] - gso->mval_prev[1]);
 
@@ -700,8 +700,8 @@ static bool gpencil_brush_pinch_apply(tGP_BrushEditData *gso,
 
 /* ----------------------------------------------- */
 /* Twist Brush - Rotate Around midpoint */
-/* Take the screenspace coordinates of the point, rotate this around the brush midpoint,
- * convert the rotated point and convert it into "data" space
+/* Take the screen-space coordinates of the point, rotate this around the brush midpoint,
+ * convert the rotated point and convert it into "data" space.
  */
 
 static bool gpencil_brush_twist_apply(tGP_BrushEditData *gso,
@@ -807,7 +807,7 @@ static bool gpencil_brush_randomize_apply(tGP_BrushEditData *gso,
   /* apply random to position */
   if (gso->brush->gpencil_settings->sculpt_mode_flag & GP_SCULPT_FLAGMODE_APPLY_POSITION) {
     /* Jitter is applied perpendicular to the mouse movement vector
-     * - We compute all effects in screenspace (since it's easier)
+     * - We compute all effects in screen-space (since it's easier)
      *   and then project these to get the points/distances in
      *   view-space as needed.
      */
@@ -989,8 +989,8 @@ static void gpencil_brush_clone_add(bContext *C, tGP_BrushEditData *gso)
   float delta[3];
   size_t strokes_added = 0;
 
-  /* Compute amount to offset the points by */
-  /* NOTE: This assumes that screenspace strokes are NOT used in the 3D view... */
+  /* Compute amount to offset the points by. */
+  /* NOTE: This assumes that screen-space strokes are NOT used in the 3D view. */
 
   gpencil_brush_calc_midpoint(gso); /* this puts the cursor location into gso->dvec */
   sub_v3_v3v3(delta, gso->dvec, data->buffer_midpoint);
@@ -1063,7 +1063,7 @@ static void gpencil_brush_clone_adjust(tGP_BrushEditData *gso)
 
   /* For each of the stored strokes, apply the offset to each point */
   /* NOTE: Again this assumes that in the 3D view,
-   * we only have 3d space and not screenspace strokes... */
+   * we only have 3d space and not screen-space strokes. */
   for (snum = 0; snum < data->totitems; snum++) {
     bGPDstroke *gps = data->new_strokes[snum];
     bGPDspoint *pt;
diff --git a/source/blender/editors/gpencil/gpencil_select.c b/source/blender/editors/gpencil/gpencil_select.c
index a19265720e8..95f43733a36 100644
--- a/source/blender/editors/gpencil/gpencil_select.c
+++ b/source/blender/editors/gpencil/gpencil_select.c
@@ -2071,7 +2071,7 @@ static bool gpencil_generic_stroke_select(bContext *C,
     for (i = 0, pt = gps->points; i < gps->totpoints; i++, pt++) {
       bGPDspoint *pt_active = (pt->runtime.pt_orig) ? pt->runtime.pt_orig : pt;
 
-      /* convert point coords to screenspace */
+      /* Convert point coords to screen-space. */
       const bool is_inside = is_inside_fn(gsc.region, gpstroke_iter.diff_mat, &pt->x, user_data);
       if (strokemode == false) {
         const bool is_select = (pt_active->flag & GP_SPOINT_SELECT) != 0;
diff --git a/source/blender/editors/gpencil/gpencil_trace_ops.c b/source/blender/editors/gpencil/gpencil_trace_ops.c
index f6e88e05d46..36165c6b7c0 100644
--- a/source/blender/editors/gpencil/gpencil_trace_ops.c
+++ b/source/blender/editors/gpencil/gpencil_trace_ops.c
@@ -71,6 +71,9 @@ typedef struct TraceJob {
   int32_t thickness;
   int32_t turnpolicy;
   int32_t mode;
+  /** Frame to render to be used by python API. Not exposed in UI.
+   * This feature is only used in Studios to run custom video trace for selected frames. */
+  int32_t frame_num;
 
   bool success;
   bool was_canceled;
@@ -212,7 +215,10 @@ static void trace_start_job(void *customdata, short *stop, short *do_update, flo
       (trace_job->mode == GPENCIL_TRACE_MODE_SINGLE)) {
     void *lock;
     ImageUser *iuser = trace_job->ob_active->iuser;
-    iuser->framenr = init_frame;
+
+    iuser->framenr = ((trace_job->frame_num == 0) || (trace_job->frame_num > iuser->frames)) ?
+                         init_frame :
+                         trace_job->frame_num;
     ImBuf *ibuf = BKE_image_acquire_ibuf(trace_job->image, iuser, &lock);
     if (ibuf) {
       /* Create frame. */
@@ -300,9 +306,10 @@ static int gpencil_trace_image_exec(bContext *C, wmOperator *op)
 
   /* Create a new grease pencil object or reuse selected. */
   eGP_TargetObjectMode target = RNA_enum_get(op->ptr, "target");
-  job->ob_gpencil = (target == GP_TARGET_OB_SELECTED) ? BKE_view_layer_non_active_selected_object(
-                                                            CTX_data_view_layer(C), job->v3d) :
-                                                        NULL;
+  job->ob_gpencil = (target == GP_TARGET_OB_SELECTED) ?
+                        BKE_view_layer_non_active_selected_object(
+                            scene, CTX_data_view_layer(C), job->v3d) :
+                        NULL;
 
   if (job->ob_gpencil != NULL) {
     if (job->ob_gpencil->type != OB_GPENCIL) {
@@ -324,13 +331,14 @@ static int gpencil_trace_image_exec(bContext *C, wmOperator *op)
   job->thickness = RNA_int_get(op->ptr, "thickness");
   job->turnpolicy = RNA_enum_get(op->ptr, "turnpolicy");
   job->mode = RNA_enum_get(op->ptr, "mode");
+  job->frame_num = RNA_int_get(op->ptr, "frame_number");
 
   trace_initialize_job_data(job);
 
   /* Back to active base. */
   ED_object_base_activate(job->C, job->base_active);
 
-  if (job->image->source == IMA_SRC_FILE) {
+  if ((job->image->source == IMA_SRC_FILE) || (job->frame_num > 0)) {
     short stop = 0, do_update = true;
     float progress;
     trace_start_job(job, &stop, &do_update, &progress);
@@ -364,6 +372,8 @@ static int gpencil_trace_image_invoke(bContext *C, wmOperator *op, const wmEvent
 
 void GPENCIL_OT_trace_image(wmOperatorType *ot)
 {
+  PropertyRNA *prop;
+
   static const EnumPropertyItem turnpolicy_type[] = {
       {POTRACE_TURNPOLICY_BLACK,
        "BLACK",
@@ -475,4 +485,15 @@ void GPENCIL_OT_trace_image(wmOperatorType *ot)
                   true,
                   "Start At Current Frame",
                   "Trace Image starting in current image frame");
+  prop = RNA_def_int(
+      ot->srna,
+      "frame_number",
+      0,
+      0,
+      9999,
+      "Trace Frame",
+      "Used to trace only one frame of the image sequence, set to zero to trace all",
+      0,
+      9999);
+  RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
diff --git a/source/blender/editors/gpencil/gpencil_utils.c b/source/blender/editors/gpencil/gpencil_utils.c
index 7b659511aaa..729e8412684 100644
--- a/source/blender/editors/gpencil/gpencil_utils.c
+++ b/source/blender/editors/gpencil/gpencil_utils.c
@@ -1038,7 +1038,8 @@ void ED_gpencil_stroke_reproject(Depsgraph *depsgraph,
                                  bGPDframe *gpf,
                                  bGPDstroke *gps,
                                  const eGP_ReprojectModes mode,
-                                 const bool keep_original)
+                                 const bool keep_original,
+                                 const float offset)
 {
   ToolSettings *ts = gsc->scene->toolsettings;
   ARegion *region = gsc->region;
@@ -1156,7 +1157,13 @@ void ED_gpencil_stroke_reproject(Depsgraph *depsgraph,
                                                &depth,
                                                &location[0],
                                                &normal[0])) {
-        copy_v3_v3(&pt->x, location);
+        /* Apply offset over surface. */
+        float normal_vector[3];
+        sub_v3_v3v3(normal_vector, ray_start, location);
+        normalize_v3(normal_vector);
+        mul_v3_fl(normal_vector, offset);
+
+        add_v3_v3v3(&pt->x, location, normal_vector);
       }
       else {
         /* Default to planar */
@@ -1683,7 +1690,7 @@ void ED_gpencil_brush_draw_eraser(Brush *brush, int x, int y)
 
   GPUVertFormat *format = immVertexFormat();
   const uint shdr_pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_line_smooth(true);
   GPU_blend(GPU_BLEND_ALPHA);
@@ -1693,7 +1700,7 @@ void ED_gpencil_brush_draw_eraser(Brush *brush, int x, int y)
 
   immUnbindProgram();
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -1865,7 +1872,7 @@ static void gpencil_brush_cursor_draw(bContext *C, int x, int y, void *customdat
   /* draw icon */
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_line_smooth(true);
   GPU_blend(GPU_BLEND_ALPHA);
@@ -3189,7 +3196,7 @@ bGPDstroke *ED_gpencil_stroke_join_and_trim(
 
   /* Join both strokes. */
   int totpoint = gps_final->totpoints;
-  BKE_gpencil_stroke_join(gps_final, gps, false, true, true);
+  BKE_gpencil_stroke_join(gps_final, gps, false, true, true, true);
 
   /* Select the join points and merge if the distance is very small. */
   pt = &gps_final->points[totpoint - 1];
diff --git a/source/blender/editors/gpencil/gpencil_vertex_ops.c b/source/blender/editors/gpencil/gpencil_vertex_ops.c
index 865c4e360b5..41f939813e4 100644
--- a/source/blender/editors/gpencil/gpencil_vertex_ops.c
+++ b/source/blender/editors/gpencil/gpencil_vertex_ops.c
@@ -131,7 +131,7 @@ static int gpencil_vertexpaint_brightness_contrast_exec(bContext *C, wmOperator
     /*
      * The algorithm is by Werner D. Streidt
      * (http://visca.com/ffactory/archives/5-99/msg00021.html)
-     * Extracted of OpenCV demhist.c
+     * Extracted of OpenCV `demhist.c`.
      */
     if (contrast > 0) {
       gain = 1.0f - delta * 2.0f;
diff --git a/source/blender/editors/include/ED_anim_api.h b/source/blender/editors/include/ED_anim_api.h
index ac3b4133007..6079aca0199 100644
--- a/source/blender/editors/include/ED_anim_api.h
+++ b/source/blender/editors/include/ED_anim_api.h
@@ -101,16 +101,16 @@ typedef struct bAnimContext {
 /* Main Data container types */
 typedef enum eAnimCont_Types {
   ANIMCONT_NONE = 0,      /* invalid or no data */
-  ANIMCONT_ACTION = 1,    /* action (bAction) */
-  ANIMCONT_SHAPEKEY = 2,  /* shapekey (Key) */
+  ANIMCONT_ACTION = 1,    /* action (#bAction) */
+  ANIMCONT_SHAPEKEY = 2,  /* shape-key (#Key) */
   ANIMCONT_GPENCIL = 3,   /* grease pencil (screen) */
-  ANIMCONT_DOPESHEET = 4, /* dopesheet (bDopesheet) */
-  ANIMCONT_FCURVES = 5,   /* animation F-Curves (bDopesheet) */
-  ANIMCONT_DRIVERS = 6,   /* drivers (bDopesheet) */
-  ANIMCONT_NLA = 7,       /* nla (bDopesheet) */
-  ANIMCONT_CHANNEL = 8,   /* animation channel (bAnimListElem) */
-  ANIMCONT_MASK = 9,      /* mask dopesheet */
-  ANIMCONT_TIMELINE = 10, /* "timeline" editor (bDopeSheet) */
+  ANIMCONT_DOPESHEET = 4, /* dope-sheet (#bDopesheet) */
+  ANIMCONT_FCURVES = 5,   /* animation F-Curves (#bDopesheet) */
+  ANIMCONT_DRIVERS = 6,   /* drivers (#bDopesheet) */
+  ANIMCONT_NLA = 7,       /* NLA (#bDopesheet) */
+  ANIMCONT_CHANNEL = 8,   /* animation channel (#bAnimListElem) */
+  ANIMCONT_MASK = 9,      /* mask dope-sheet */
+  ANIMCONT_TIMELINE = 10, /* "timeline" editor (#bDopeSheet) */
 } eAnimCont_Types;
 
 /** \} */
@@ -334,6 +334,7 @@ typedef enum eAnimFilter_Flags {
   ANIMFILTER_TMP_IGNORE_ONLYSEL = (1u << 31),
 
 } eAnimFilter_Flags;
+ENUM_OPERATORS(eAnimFilter_Flags, ANIMFILTER_TMP_IGNORE_ONLYSEL);
 
 /** \} */
 
@@ -1046,6 +1047,8 @@ void ED_keymap_anim(struct wmKeyConfig *keyconf);
 void ED_operatormacros_graph(void);
 /* space_action */
 void ED_operatormacros_action(void);
+/* space_nla*/
+void ED_operatormacros_nla(void);
 
 /** \} */
 
diff --git a/source/blender/editors/include/ED_armature.h b/source/blender/editors/include/ED_armature.h
index d969277fef5..8e7f728a3e7 100644
--- a/source/blender/editors/include/ED_armature.h
+++ b/source/blender/editors/include/ED_armature.h
@@ -312,7 +312,8 @@ void ED_pose_recalculate_paths(struct bContext *C,
 /**
  * \return True when pick finds an element or the selection changed.
  */
-bool ED_armature_pose_select_pick_bone(struct ViewLayer *view_layer,
+bool ED_armature_pose_select_pick_bone(const struct Scene *scene,
+                                       struct ViewLayer *view_layer,
                                        struct View3D *v3d,
                                        struct Object *ob,
                                        struct Bone *bone,
@@ -323,7 +324,8 @@ bool ED_armature_pose_select_pick_bone(struct ViewLayer *view_layer,
  *
  * \return True when pick finds an element or the selection changed.
  */
-bool ED_armature_pose_select_pick_with_buffer(struct ViewLayer *view_layer,
+bool ED_armature_pose_select_pick_with_buffer(const struct Scene *scene,
+                                              struct ViewLayer *view_layer,
                                               struct View3D *v3d,
                                               struct Base *base,
                                               const struct GPUSelectResult *buffer,
@@ -338,7 +340,8 @@ bool ED_armature_pose_select_pick_with_buffer(struct ViewLayer *view_layer,
  * It can't be set to the active object because we need
  * to keep this set to the weight paint object.
  */
-void ED_armature_pose_select_in_wpaint_mode(struct ViewLayer *view_layer,
+void ED_armature_pose_select_in_wpaint_mode(const struct Scene *scene,
+                                            struct ViewLayer *view_layer,
                                             struct Base *base_select);
 bool ED_pose_deselect_all_multi_ex(struct Base **bases,
                                    uint bases_len,
diff --git a/source/blender/editors/include/ED_curves.h b/source/blender/editors/include/ED_curves.h
index 0817241a5c2..00831ff7cc3 100644
--- a/source/blender/editors/include/ED_curves.h
+++ b/source/blender/editors/include/ED_curves.h
@@ -26,10 +26,14 @@ void ED_operatortypes_curves(void);
 namespace blender::ed::curves {
 
 bke::CurvesGeometry primitive_random_sphere(int curves_size, int points_per_curve);
-bool selection_operator_poll(bContext *C);
 bool has_anything_selected(const Curves &curves_id);
 VectorSet<Curves *> get_unique_editable_curves(const bContext &C);
 void ensure_surface_deformation_node_exists(bContext &C, Object &curves_ob);
 
+bool editable_curves_with_surface_poll(bContext *C);
+bool curves_with_surface_poll(bContext *C);
+bool editable_curves_poll(bContext *C);
+bool curves_poll(bContext *C);
+
 }  // namespace blender::ed::curves
 #endif
diff --git a/source/blender/editors/include/ED_curves_sculpt.h b/source/blender/editors/include/ED_curves_sculpt.h
index 8aab1533e25..b1c0b649d2b 100644
--- a/source/blender/editors/include/ED_curves_sculpt.h
+++ b/source/blender/editors/include/ED_curves_sculpt.h
@@ -10,8 +10,33 @@
 extern "C" {
 #endif
 
+struct Curves;
+
 void ED_operatortypes_sculpt_curves(void);
 
 #ifdef __cplusplus
 }
 #endif
+
+#ifdef __cplusplus
+
+#  include "BLI_index_mask.hh"
+#  include "BLI_vector.hh"
+
+namespace blender::ed::sculpt_paint {
+
+/**
+ * Find curves that have any point selected (a selection factor greater than zero),
+ * or curves that have their own selection factor greater than zero.
+ */
+IndexMask retrieve_selected_curves(const Curves &curves_id, Vector<int64_t> &r_indices);
+
+/**
+ * Find points that are selected (a selection factor greater than zero),
+ * or points in curves with a selection factor greater than zero).
+ */
+IndexMask retrieve_selected_points(const Curves &curves_id, Vector<int64_t> &r_indices);
+
+}  // namespace blender::ed::sculpt_paint
+
+#endif
diff --git a/source/blender/editors/include/ED_fileselect.h b/source/blender/editors/include/ED_fileselect.h
index e9fcd2bd5fe..9d5d8dd54cb 100644
--- a/source/blender/editors/include/ED_fileselect.h
+++ b/source/blender/editors/include/ED_fileselect.h
@@ -175,6 +175,14 @@ struct ScrArea *ED_fileselect_handler_area_find(const struct wmWindow *win,
  */
 struct ScrArea *ED_fileselect_handler_area_find_any_with_op(const struct wmWindow *win);
 
+/**
+ * If filepath property is not set on the operator, sets it to
+ * the blend file path (or untitled if file is not saved yet) with the given extension.
+ */
+void ED_fileselect_ensure_default_filepath(struct bContext *C,
+                                           struct wmOperator *op,
+                                           const char *extension);
+
 /* TODO: Maybe we should move this to BLI?
  * On the other hand, it's using defines from space-file area, so not sure... */
 int ED_path_extension_type(const char *path);
diff --git a/source/blender/editors/include/ED_gpencil.h b/source/blender/editors/include/ED_gpencil.h
index b6488d6da56..45e61592424 100644
--- a/source/blender/editors/include/ED_gpencil.h
+++ b/source/blender/editors/include/ED_gpencil.h
@@ -403,12 +403,11 @@ void ED_gpencil_stroke_init_data(struct bGPDstroke *gps,
  */
 void ED_gpencil_create_blank(struct bContext *C, struct Object *ob, float mat[4][4]);
 /**
- * Add a 2D Suzanne (original model created by Matias Mendiola).
+ * Add a 2D Suzanne.
  */
 void ED_gpencil_create_monkey(struct bContext *C, struct Object *ob, float mat[4][4]);
 /**
- * Add a Simple stroke with colors
- * (original design created by Daniel M. Lara and Matias Mendiola).
+ * Add a Simple stroke with colors.
  */
 void ED_gpencil_create_stroke(struct bContext *C, struct Object *ob, float mat[4][4]);
 /**
@@ -476,7 +475,8 @@ void ED_gpencil_stroke_reproject(struct Depsgraph *depsgraph,
                                  struct bGPDframe *gpf,
                                  struct bGPDstroke *gps,
                                  eGP_ReprojectModes mode,
-                                 bool keep_original);
+                                 bool keep_original,
+                                 const float offset);
 
 /**
  * Turn brush cursor in on/off.
diff --git a/source/blender/editors/include/ED_image.h b/source/blender/editors/include/ED_image.h
index 91ae8286531..da303f3552b 100644
--- a/source/blender/editors/include/ED_image.h
+++ b/source/blender/editors/include/ED_image.h
@@ -32,14 +32,15 @@ struct wmWindowManager;
 
 float ED_space_image_zoom_level(const struct View2D *v2d, int grid_dimension);
 void ED_space_image_grid_steps(struct SpaceImage *sima,
-                               float grid_steps[SI_GRID_STEPS_LEN],
+                               float grid_steps_x[SI_GRID_STEPS_LEN],
+                               float grid_steps_y[SI_GRID_STEPS_LEN],
                                int grid_dimension);
 /**
  * Calculate the increment snapping value for UV/image editor based on the zoom factor
  * The code in here (except the offset part) is used in `grid_frag.glsl` (see `grid_res`) for
  * drawing the grid overlay for the UV/Image editor.
  */
-float ED_space_image_increment_snap_value(int grid_dimesnions,
+float ED_space_image_increment_snap_value(int grid_dimensions,
                                           const float grid_steps[SI_GRID_STEPS_LEN],
                                           float zoom_factor);
 
diff --git a/source/blender/editors/include/ED_keyframes_edit.h b/source/blender/editors/include/ED_keyframes_edit.h
index 9596c3a7fed..e5bcdcdd282 100644
--- a/source/blender/editors/include/ED_keyframes_edit.h
+++ b/source/blender/editors/include/ED_keyframes_edit.h
@@ -235,7 +235,7 @@ typedef enum eKeyPasteError {
   KEYFRAME_PASTE_OK,
   /* Nothing was copied */
   KEYFRAME_PASTE_NOTHING_TO_PASTE,
-  /* No F-curves was selected to paste into*/
+  /* No F-curves was selected to paste into. */
   KEYFRAME_PASTE_NOWHERE_TO_PASTE
 } eKeyPasteError;
 
@@ -388,9 +388,6 @@ bool keyframe_region_circle_test(const KeyframeEdit_CircleData *data_circle, con
 /* ************************************************ */
 /* Destructive Editing API (keyframes_general.c) */
 
-void delete_fcurve_key(struct FCurve *fcu, int index, bool do_recalc);
-bool delete_fcurve_keys(struct FCurve *fcu);
-void clear_fcurve_keys(struct FCurve *fcu);
 bool duplicate_fcurve_keys(struct FCurve *fcu);
 float get_default_rna_value(struct FCurve *fcu, struct PropertyRNA *prop, struct PointerRNA *ptr);
 
diff --git a/source/blender/editors/include/ED_mesh.h b/source/blender/editors/include/ED_mesh.h
index 30a98129ee6..26743a2bd08 100644
--- a/source/blender/editors/include/ED_mesh.h
+++ b/source/blender/editors/include/ED_mesh.h
@@ -137,14 +137,17 @@ void EDBM_update_extern(struct Mesh *me, bool do_tessellation, bool is_destructi
  */
 struct UvElementMap *BM_uv_element_map_create(struct BMesh *bm,
                                               const struct Scene *scene,
-                                              bool face_selected,
                                               bool uv_selected,
                                               bool use_winding,
+                                              bool use_seams,
                                               bool do_islands);
 void BM_uv_element_map_free(struct UvElementMap *element_map);
-struct UvElement *BM_uv_element_get(struct UvElementMap *map,
-                                    struct BMFace *efa,
-                                    struct BMLoop *l);
+struct UvElement *BM_uv_element_get(const struct UvElementMap *map,
+                                    const struct BMFace *efa,
+                                    const struct BMLoop *l);
+struct UvElement *BM_uv_element_get_head(struct UvElementMap *map, struct UvElement *child);
+
+struct UvElement **BM_uv_element_map_ensure_head_table(struct UvElementMap *element_map);
 
 /**
  * Can we edit UV's for this mesh?
@@ -181,9 +184,13 @@ void EDBM_project_snap_verts(struct bContext *C,
 
 /* editmesh_automerge.c */
 
-void EDBM_automerge(struct Object *ob, bool update, char hflag, float dist);
-void EDBM_automerge_and_split(
-    struct Object *ob, bool split_edges, bool split_faces, bool update, char hflag, float dist);
+void EDBM_automerge(struct Object *obedit, bool update, char hflag, float dist);
+void EDBM_automerge_and_split(struct Object *obedit,
+                              bool split_edges,
+                              bool split_faces,
+                              bool update,
+                              char hflag,
+                              float dist);
 
 /* editmesh_undo.c */
 
@@ -390,7 +397,10 @@ void ED_keymap_mesh(struct wmKeyConfig *keyconf);
  * Copy the face flags, most importantly selection from the mesh to the final derived mesh,
  * use in object mode when selecting faces (while painting).
  */
-void paintface_flush_flags(struct bContext *C, struct Object *ob, short flag);
+void paintface_flush_flags(struct bContext *C,
+                           struct Object *ob,
+                           bool flush_selection,
+                           bool flush_hidden);
 /**
  * \return True when pick finds an element or the selection changed.
  */
@@ -425,6 +435,9 @@ void paintvert_select_ungrouped(struct Object *ob, bool extend, bool flush_flags
 void paintvert_flush_flags(struct Object *ob);
 void paintvert_tag_select_update(struct bContext *C, struct Object *ob);
 
+void paintvert_hide(struct bContext *C, struct Object *ob, bool unselected);
+void paintvert_reveal(struct bContext *C, struct Object *ob, bool select);
+
 /* mirrtopo */
 typedef struct MirrTopoStore_t {
   intptr_t *index_lookup;
@@ -442,7 +455,7 @@ void ED_mesh_mirrtopo_init(struct BMEditMesh *em,
                            bool skip_em_vert_array_init);
 void ED_mesh_mirrtopo_free(MirrTopoStore_t *mesh_topo_store);
 
-/* object_vgroup.c */
+/* object_vgroup.cc */
 
 #define WEIGHT_REPLACE 1
 #define WEIGHT_ADD 2
@@ -550,16 +563,10 @@ void ED_mesh_uv_loop_reset_ex(struct Mesh *me, int layernum);
 bool ED_mesh_color_ensure(struct Mesh *me, const char *name);
 int ED_mesh_color_add(
     struct Mesh *me, const char *name, bool active_set, bool do_init, struct ReportList *reports);
-bool ED_mesh_color_remove_index(struct Mesh *me, int n);
-bool ED_mesh_color_remove_active(struct Mesh *me);
-bool ED_mesh_color_remove_named(struct Mesh *me, const char *name);
-
-bool ED_mesh_sculpt_color_ensure(struct Mesh *me, const char *name);
-int ED_mesh_sculpt_color_add(
-    struct Mesh *me, const char *name, bool active_set, bool do_init, struct ReportList *reports);
-bool ED_mesh_sculpt_color_remove_index(struct Mesh *me, int n);
-bool ED_mesh_sculpt_color_remove_active(struct Mesh *me);
-bool ED_mesh_sculpt_color_remove_named(struct Mesh *me, const char *name);
+int ED_mesh_sculpt_color_add(struct Mesh *me,
+                             const char *name,
+                             bool do_init,
+                             struct ReportList *reports);
 
 void ED_mesh_report_mirror(struct wmOperator *op, int totmirr, int totfail);
 void ED_mesh_report_mirror_ex(struct wmOperator *op, int totmirr, int totfail, char selectmode);
diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 39c7ad3556c..acb0e53aa55 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -112,6 +112,7 @@ struct XFormObjectSkipChild_Container;
 struct XFormObjectSkipChild_Container *ED_object_xform_skip_child_container_create(void);
 void ED_object_xform_skip_child_container_item_ensure_from_array(
     struct XFormObjectSkipChild_Container *xcs,
+    const struct Scene *scene,
     struct ViewLayer *view_layer,
     struct Object **objects,
     uint objects_len);
@@ -213,16 +214,20 @@ void ED_object_base_free_and_unlink(struct Main *bmain, struct Scene *scene, str
 void ED_object_base_free_and_unlink_no_indirect_check(struct Main *bmain,
                                                       struct Scene *scene,
                                                       struct Object *ob);
-bool ED_object_base_deselect_all_ex(struct ViewLayer *view_layer,
+bool ED_object_base_deselect_all_ex(const struct Scene *scene,
+                                    struct ViewLayer *view_layer,
                                     struct View3D *v3d,
                                     int action,
                                     bool *r_any_visible);
-bool ED_object_base_deselect_all(struct ViewLayer *view_layer, struct View3D *v3d, int action);
+bool ED_object_base_deselect_all(const struct Scene *scene,
+                                 struct ViewLayer *view_layer,
+                                 struct View3D *v3d,
+                                 int action);
 
 /**
  * Single object duplicate, if `dupflag == 0`, fully linked, else it uses the flags given.
  * Leaves selection of base/object unaltered.
- * \note don't call this within a loop since clear_* funcs loop over the entire database.
+ * \note don't call this within a loop since clear_* functions loop over the entire database.
  * \note caller must do `DAG_relations_tag_update(bmain);`
  * this is not done automatic since we may duplicate many objects in a batch.
  */
@@ -539,6 +544,7 @@ bool ED_object_modifier_move_to_index(struct ReportList *reports,
 bool ED_object_modifier_convert_psys_to_mesh(struct ReportList *reports,
                                              struct Main *bmain,
                                              struct Depsgraph *depsgraph,
+                                             struct Scene *scene,
                                              struct ViewLayer *view_layer,
                                              struct Object *ob,
                                              struct ModifierData *md);
@@ -662,7 +668,9 @@ void ED_object_check_force_modifiers(struct Main *bmain,
  * If id is not already an Object, try to find an object that uses it as data.
  * Prefers active, then selected, then visible/selectable.
  */
-struct Base *ED_object_find_first_by_data_id(struct ViewLayer *view_layer, struct ID *id);
+struct Base *ED_object_find_first_by_data_id(const struct Scene *scene,
+                                             struct ViewLayer *view_layer,
+                                             struct ID *id);
 
 /**
  * Select and make the target object active in the view layer.
diff --git a/source/blender/editors/include/ED_paint.h b/source/blender/editors/include/ED_paint.h
index ba5834fd508..048424cdee1 100644
--- a/source/blender/editors/include/ED_paint.h
+++ b/source/blender/editors/include/ED_paint.h
@@ -22,6 +22,7 @@ struct UndoType;
 struct bContext;
 struct wmKeyConfig;
 struct wmOperator;
+typedef struct PaintTileMap PaintTileMap;
 
 /* paint_ops.c */
 
@@ -76,7 +77,7 @@ void ED_image_undo_restore(struct UndoStep *us);
 /** Export for ED_undo_sys. */
 void ED_image_undosys_type(struct UndoType *ut);
 
-void *ED_image_paint_tile_find(struct ListBase *paint_tiles,
+void *ED_image_paint_tile_find(PaintTileMap *paint_tile_map,
                                struct Image *image,
                                struct ImBuf *ibuf,
                                struct ImageUser *iuser,
@@ -84,7 +85,7 @@ void *ED_image_paint_tile_find(struct ListBase *paint_tiles,
                                int y_tile,
                                unsigned short **r_mask,
                                bool validate);
-void *ED_image_paint_tile_push(struct ListBase *paint_tiles,
+void *ED_image_paint_tile_push(PaintTileMap *paint_tile_map,
                                struct Image *image,
                                struct ImBuf *ibuf,
                                struct ImBuf **tmpibuf,
@@ -98,7 +99,7 @@ void *ED_image_paint_tile_push(struct ListBase *paint_tiles,
 void ED_image_paint_tile_lock_init(void);
 void ED_image_paint_tile_lock_end(void);
 
-struct ListBase *ED_image_paint_tile_list_get(void);
+struct PaintTileMap *ED_image_paint_tile_map_get(void);
 
 #define ED_IMAGE_UNDO_TILE_BITS 6
 #define ED_IMAGE_UNDO_TILE_SIZE (1 << ED_IMAGE_UNDO_TILE_BITS)
diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index a24c8625a63..144fa4e0b93 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -294,7 +294,7 @@ void ED_screen_refresh(struct wmWindowManager *wm, struct wmWindow *win);
 void ED_screen_ensure_updated(struct wmWindowManager *wm,
                               struct wmWindow *win,
                               struct bScreen *screen);
-void ED_screen_do_listen(struct bContext *C, struct wmNotifier *note);
+void ED_screen_do_listen(struct bContext *C, const struct wmNotifier *note);
 /**
  * \brief Change the active screen.
  *
@@ -353,8 +353,8 @@ struct ScrArea *ED_screen_state_toggle(struct bContext *C,
                                        struct ScrArea *area,
                                        short state);
 /**
- * Wrapper to open a temporary space either as fullscreen space, or as separate window, as defined
- * by \a display_type.
+ * Wrapper to open a temporary space either as full-screen space, or as separate window,
+ * as defined by \a display_type.
  *
  * \param title: Title to set for the window, if a window is spawned.
  * \param x, y: Position of the window, if a window is spawned.
diff --git a/source/blender/editors/include/ED_screen_types.h b/source/blender/editors/include/ED_screen_types.h
index 21bb412d072..bf64be9f7a7 100644
--- a/source/blender/editors/include/ED_screen_types.h
+++ b/source/blender/editors/include/ED_screen_types.h
@@ -112,7 +112,7 @@ enum {
    */
   AZONE_REGION,
   /**
-   * Used when in editor fullscreen draw a corner to return to normal mode.
+   * Used when in editor full-screen draw a corner to return to normal mode.
    */
   AZONE_FULLSCREEN,
   /**
diff --git a/source/blender/editors/include/ED_sculpt.h b/source/blender/editors/include/ED_sculpt.h
index 550040d2bc6..1e220d33ff4 100644
--- a/source/blender/editors/include/ED_sculpt.h
+++ b/source/blender/editors/include/ED_sculpt.h
@@ -20,6 +20,7 @@ struct rcti;
 struct wmMsgSubscribeKey;
 struct wmMsgSubscribeValue;
 struct wmRegionMessageSubscribeParams;
+struct wmOperator;
 
 /* sculpt.c */
 
@@ -33,7 +34,7 @@ bool ED_sculpt_mask_box_select(struct bContext *C,
 /* sculpt_transform.c */
 
 void ED_sculpt_update_modal_transform(struct bContext *C, struct Object *ob);
-void ED_sculpt_init_transform(struct bContext *C, struct Object *ob);
+void ED_sculpt_init_transform(struct bContext *C, struct Object *ob, const char *undo_name);
 void ED_sculpt_end_transform(struct bContext *C, struct Object *ob);
 
 /* sculpt_undo.c */
@@ -41,7 +42,13 @@ void ED_sculpt_end_transform(struct bContext *C, struct Object *ob);
 /** Export for ED_undo_sys. */
 void ED_sculpt_undosys_type(struct UndoType *ut);
 
-void ED_sculpt_undo_geometry_begin(struct Object *ob, const char *name);
+/**
+ * Pushes an undo step using the operator name. This is necessary for
+ * redo panels to work; operators that do not support that may use
+ * #ED_sculpt_undo_geometry_begin_ex instead if so desired.
+ */
+void ED_sculpt_undo_geometry_begin(struct Object *ob, const struct wmOperator *op);
+void ED_sculpt_undo_geometry_begin_ex(struct Object *ob, const char *name);
 void ED_sculpt_undo_geometry_end(struct Object *ob);
 
 /* Face sets. */
diff --git a/source/blender/editors/include/ED_space_api.h b/source/blender/editors/include/ED_space_api.h
index c69698f3f73..07d4f43bb2b 100644
--- a/source/blender/editors/include/ED_space_api.h
+++ b/source/blender/editors/include/ED_space_api.h
@@ -50,7 +50,7 @@ void ED_spacetype_spreadsheet(void);
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Spacetype Static Data
+/** \name Space-type Static Data
  * Calls for instancing and freeing space-type static data called in #WM_init_exit
  * \{ */
 
diff --git a/source/blender/editors/include/ED_transform.h b/source/blender/editors/include/ED_transform.h
index 82cc518f029..d7fb108809f 100644
--- a/source/blender/editors/include/ED_transform.h
+++ b/source/blender/editors/include/ED_transform.h
@@ -94,7 +94,8 @@ bool BIF_createTransformOrientation(struct bContext *C,
                                     bool overwrite);
 void BIF_selectTransformOrientation(struct bContext *C, struct TransformOrientation *target);
 
-void ED_getTransformOrientationMatrix(struct ViewLayer *view_layer,
+void ED_getTransformOrientationMatrix(const struct Scene *scene,
+                                      struct ViewLayer *view_layer,
                                       const struct View3D *v3d,
                                       struct Object *ob,
                                       struct Object *obedit,
diff --git a/source/blender/editors/include/ED_transform_snap_object_context.h b/source/blender/editors/include/ED_transform_snap_object_context.h
index db44d9af706..f9ca578f282 100644
--- a/source/blender/editors/include/ED_transform_snap_object_context.h
+++ b/source/blender/editors/include/ED_transform_snap_object_context.h
@@ -57,13 +57,13 @@ struct SnapObjectParams {
   /* Geometry for snapping in edit mode. */
   eSnapEditType edit_mode_type;
   /* snap to the closest element, use when using more than one snap type */
-  bool use_occlusion_test : true;
+  bool use_occlusion_test : 1;
   /* exclude back facing geometry from snapping */
-  bool use_backface_culling : true;
+  bool use_backface_culling : 1;
   /* Break nearest face snapping into steps to improve transformations across U-shaped targets. */
   short face_nearest_steps;
   /* Enable to force nearest face snapping to snap to target the source was initially near. */
-  bool keep_on_same_target;
+  bool keep_on_same_target : 1;
 };
 
 typedef struct SnapObjectContext SnapObjectContext;
diff --git a/source/blender/editors/include/ED_types.h b/source/blender/editors/include/ED_types.h
deleted file mode 100644
index eba93ed6744..00000000000
--- a/source/blender/editors/include/ED_types.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright 2008 Blender Foundation. All rights reserved. */
-
-/** \file
- * \ingroup editors
- */
-
-#pragma once
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* **************** GENERAL EDITOR-WIDE TYPES AND DEFINES ************************** */
-
-/* old blender defines... should be deprecated? */
-#define DESELECT 0
-#define SELECT 1
-#define ACTIVE 2
-
-/* proposal = put scene pointers on function calls? */
-// #define BASACT                    (scene->basact)
-// #define OBACT                     (BASACT ? BASACT->object : NULL)
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/source/blender/editors/include/ED_undo.h b/source/blender/editors/include/ED_undo.h
index 8c5f25e6b67..39bbd8adc75 100644
--- a/source/blender/editors/include/ED_undo.h
+++ b/source/blender/editors/include/ED_undo.h
@@ -15,6 +15,7 @@ extern "C" {
 struct Base;
 struct CLG_LogRef;
 struct Object;
+struct Scene;
 struct UndoStack;
 struct ViewLayer;
 struct bContext;
@@ -79,9 +80,12 @@ void ED_undo_object_editmode_restore_helper(struct bContext *C,
                                             uint object_array_len,
                                             uint object_array_stride);
 
-struct Object **ED_undo_editmode_objects_from_view_layer(struct ViewLayer *view_layer,
+struct Object **ED_undo_editmode_objects_from_view_layer(const struct Scene *scene,
+                                                         struct ViewLayer *view_layer,
                                                          uint *r_len);
-struct Base **ED_undo_editmode_bases_from_view_layer(struct ViewLayer *view_layer, uint *r_len);
+struct Base **ED_undo_editmode_bases_from_view_layer(const struct Scene *scene,
+                                                     struct ViewLayer *view_layer,
+                                                     uint *r_len);
 
 /**
  * Ideally we won't access the stack directly,
diff --git a/source/blender/editors/include/ED_uvedit.h b/source/blender/editors/include/ED_uvedit.h
index 80a75da27f8..38e542fc0ca 100644
--- a/source/blender/editors/include/ED_uvedit.h
+++ b/source/blender/editors/include/ED_uvedit.h
@@ -107,7 +107,7 @@ bool uvedit_uv_select_test(const struct Scene *scene, struct BMLoop *l, int cd_l
  * Changes selection state of a single UV Face.
  */
 void uvedit_face_select_set(const struct Scene *scene,
-                            struct BMEditMesh *em,
+                            struct BMesh *em,
                             struct BMFace *efa,
                             bool select,
                             bool do_history,
@@ -118,7 +118,7 @@ void uvedit_face_select_set(const struct Scene *scene,
  * Changes selection state of a single UV Edge.
  */
 void uvedit_edge_select_set(const struct Scene *scene,
-                            struct BMEditMesh *em,
+                            struct BMesh *em,
                             struct BMLoop *l,
                             bool select,
                             bool do_history,
@@ -129,7 +129,7 @@ void uvedit_edge_select_set(const struct Scene *scene,
  * Changes selection state of a single UV vertex.
  */
 void uvedit_uv_select_set(const struct Scene *scene,
-                          struct BMEditMesh *em,
+                          struct BMesh *em,
                           struct BMLoop *l,
                           bool select,
                           bool do_history,
@@ -139,30 +139,30 @@ void uvedit_uv_select_set(const struct Scene *scene,
  * use. */
 
 void uvedit_face_select_enable(const struct Scene *scene,
-                               struct BMEditMesh *em,
+                               struct BMesh *bm,
                                struct BMFace *efa,
                                bool do_history,
                                int cd_loop_uv_offset);
 void uvedit_face_select_disable(const struct Scene *scene,
-                                struct BMEditMesh *em,
+                                struct BMesh *bm,
                                 struct BMFace *efa,
                                 int cd_loop_uv_offset);
 void uvedit_edge_select_enable(const struct Scene *scene,
-                               struct BMEditMesh *em,
+                               struct BMesh *bm,
                                struct BMLoop *l,
                                bool do_history,
                                int cd_loop_uv_offset);
 void uvedit_edge_select_disable(const struct Scene *scene,
-                                struct BMEditMesh *em,
+                                struct BMesh *bm,
                                 struct BMLoop *l,
                                 int cd_loop_uv_offset);
 void uvedit_uv_select_enable(const struct Scene *scene,
-                             struct BMEditMesh *em,
+                             struct BMesh *bm,
                              struct BMLoop *l,
                              bool do_history,
                              int cd_loop_uv_offset);
 void uvedit_uv_select_disable(const struct Scene *scene,
-                              struct BMEditMesh *em,
+                              struct BMesh *bm,
                               struct BMLoop *l,
                               int cd_loop_uv_offset);
 
@@ -179,13 +179,13 @@ void uvedit_edge_select_set_with_sticky(const struct Scene *scene,
                                         struct BMLoop *l,
                                         bool select,
                                         bool do_history,
-                                        uint cd_loop_uv_offset);
+                                        int cd_loop_uv_offset);
 void uvedit_uv_select_set_with_sticky(const struct Scene *scene,
                                       struct BMEditMesh *em,
                                       struct BMLoop *l,
                                       bool select,
                                       bool do_history,
-                                      uint cd_loop_uv_offset);
+                                      int cd_loop_uv_offset);
 
 /* Low level functions for sticky element selection (sticky mode independent). Type of sticky
  * selection is specified explicitly (using sticky_flag, except for face selection). */
@@ -305,6 +305,29 @@ void ED_uvedit_buttons_register(struct ARegionType *art);
 
 /* uvedit_islands.c */
 
+struct FaceIsland {
+  struct FaceIsland *next;
+  struct FaceIsland *prev;
+  struct BMFace **faces;
+  int faces_len;
+  rctf bounds_rect;
+  /**
+   * \note While this is duplicate information,
+   * it allows islands from multiple meshes to be stored in the same list.
+   */
+  int cd_loop_uv_offset;
+  float aspect_y;
+};
+
+int bm_mesh_calc_uv_islands(const Scene *scene,
+                            struct BMesh *bm,
+                            ListBase *island_list,
+                            const bool only_selected_faces,
+                            const bool only_selected_uvs,
+                            const bool use_seams,
+                            const float aspect_y,
+                            const int cd_loop_uv_offset);
+
 struct UVMapUDIM_Params {
   const struct Image *image;
   /** Copied from #SpaceImage.tile_grid_shape */
diff --git a/source/blender/editors/include/ED_view3d.h b/source/blender/editors/include/ED_view3d.h
index 0298983ed26..c72f3121217 100644
--- a/source/blender/editors/include/ED_view3d.h
+++ b/source/blender/editors/include/ED_view3d.h
@@ -711,7 +711,7 @@ bool ED_view3d_win_to_segment_clipped(const struct Depsgraph *depsgraph,
                                       float r_ray_start[3],
                                       float r_ray_end[3],
                                       bool do_clip_planes);
-void ED_view3d_ob_project_mat_get(const struct RegionView3D *v3d,
+void ED_view3d_ob_project_mat_get(const struct RegionView3D *rv3d,
                                   const struct Object *ob,
                                   float r_pmat[4][4]);
 void ED_view3d_ob_project_mat_get_from_obmat(const struct RegionView3D *rv3d,
@@ -950,7 +950,7 @@ int view3d_opengl_select_with_id_filter(struct ViewContext *vc,
                                         eV3DSelectObjectFilter select_filter,
                                         uint select_id);
 
-/* view3d_select.c */
+/* view3d_select.cc */
 
 float ED_view3d_select_dist_px(void);
 void ED_view3d_viewcontext_init(struct bContext *C,
@@ -1171,7 +1171,7 @@ void ED_view3d_camera_lock_init(const struct Depsgraph *depsgraph,
  *
  * Apply the 3D Viewport transformation back to the camera object.
  *
- * \return true if the camera is moved.
+ * \return true if the camera (or one of it's parents) was moved.
  */
 bool ED_view3d_camera_lock_sync(const struct Depsgraph *depsgraph,
                                 struct View3D *v3d,
@@ -1196,6 +1196,36 @@ bool ED_view3d_camera_lock_autokey(struct View3D *v3d,
 
 void ED_view3d_lock_clear(struct View3D *v3d);
 
+/**
+ * Check if creating an undo step should be performed if the viewport moves.
+ * \return true if #ED_view3d_camera_lock_undo_push would do an undo push.
+ */
+bool ED_view3d_camera_lock_undo_test(const View3D *v3d,
+                                     const RegionView3D *rv3d,
+                                     struct bContext *C);
+
+/**
+ * Create an undo step when the camera is locked to the view.
+ * \param str: The name of the undo step (typically #wmOperatorType.name should be used).
+ *
+ * \return true when the call to push an undo step was made.
+ */
+bool ED_view3d_camera_lock_undo_push(const char *str,
+                                     const View3D *v3d,
+                                     const struct RegionView3D *rv3d,
+                                     struct bContext *C);
+
+/**
+ * A version of #ED_view3d_camera_lock_undo_push that performs a grouped undo push.
+ *
+ * \note use for actions that are likely to be repeated such as mouse wheel to zoom,
+ * where adding a separate undo step each time isn't desirable.
+ */
+bool ED_view3d_camera_lock_undo_grouped_push(const char *str,
+                                             const View3D *v3d,
+                                             const struct RegionView3D *rv3d,
+                                             struct bContext *C);
+
 #define VIEW3D_MARGIN 1.4f
 #define VIEW3D_DIST_FALLBACK 1.0f
 
diff --git a/source/blender/editors/include/UI_abstract_view.hh b/source/blender/editors/include/UI_abstract_view.hh
index 82f81f1702b..dfddace8899 100644
--- a/source/blender/editors/include/UI_abstract_view.hh
+++ b/source/blender/editors/include/UI_abstract_view.hh
@@ -3,11 +3,16 @@
 /** \file
  * \ingroup editorui
  *
- * Base for all views (UIs to display data sets), supporting common features.
+ * Base class for all views (UIs to display data sets) and view items, supporting common features.
  * https://wiki.blender.org/wiki/Source/Interface/Views
  *
  * One of the most important responsibilities of the base class is managing reconstruction,
- * enabling state that is persistent over reconstructions/redraws.
+ * enabling state that is persistent over reconstructions/redraws. Other features:
+ * - Renaming
+ * - Custom context menus
+ * - Notifier listening
+ * - Drag controllers (dragging view items)
+ * - Drop controllers (dropping onto/into view items)
  */
 
 #pragma once
@@ -15,13 +20,28 @@
 #include <array>
 #include <memory>
 
+#include "DNA_defs.h"
+
 #include "BLI_span.hh"
+#include "BLI_string_ref.hh"
 
+struct bContext;
+struct uiBlock;
+struct uiBut;
+struct uiLayout;
+struct uiViewItemHandle;
+struct wmDrag;
 struct wmNotifier;
 
 namespace blender::ui {
 
+class AbstractViewItem;
+class AbstractViewItemDropController;
+class AbstractViewItemDragController;
+
 class AbstractView {
+  friend class AbstractViewItem;
+
   bool is_reconstructed_ = false;
   /**
    * Only one item can be renamed at a time. So rather than giving each item an own rename buffer
@@ -38,6 +58,12 @@ class AbstractView {
   /** Listen to a notifier, returning true if a redraw is needed. */
   virtual bool listen(const wmNotifier &) const;
 
+  /**
+   * Makes \a item valid for display in this view. Behavior is undefined for items not registered
+   * with this.
+   */
+  void register_item(AbstractViewItem &item);
+
   /** Only one item can be renamed at a time. */
   bool is_renaming() const;
   /** \return If renaming was started successfully. */
@@ -58,7 +84,6 @@ class AbstractView {
    * After this, reconstruction is complete (see #is_reconstructed()).
    */
   void update_from_old(uiBlock &new_block);
-
   /**
    * Check if the view is fully (re-)constructed. That means, both the build function and
    * #update_from_old() have finished.
@@ -66,4 +91,190 @@ class AbstractView {
   bool is_reconstructed() const;
 };
 
+class AbstractViewItem {
+  friend class AbstractView;
+  friend class ViewItemAPIWrapper;
+
+ protected:
+  /**
+   * The view this item is a part of, and was registered for using #AbstractView::register_item().
+   * If this wasn't done, the behavior of items is undefined.
+   */
+  AbstractView *view_ = nullptr;
+  bool is_active_ = false;
+  bool is_renaming_ = false;
+
+ public:
+  virtual ~AbstractViewItem() = default;
+
+  virtual void build_context_menu(bContext &C, uiLayout &column) const;
+
+  /**
+   * Queries if the view item supports renaming in principle. Renaming may still fail, e.g. if
+   * another item is already being renamed.
+   */
+  virtual bool supports_renaming() const;
+  /**
+   * Try renaming the item, or the data it represents. Can assume
+   * #AbstractViewItem::supports_renaming() returned true. Sub-classes that override this should
+   * usually call this, unless they have a custom #AbstractViewItem.matches() implementation.
+   *
+   * \return True if the renaming was successful.
+   */
+  virtual bool rename(StringRefNull new_name);
+  /**
+   * Get the string that should be used for renaming, typically the item's label. This string will
+   * not be modified, but if the renaming is canceled, the value will be reset to this.
+   */
+  virtual StringRef get_rename_string() const;
+
+  /**
+   * If an item wants to support being dragged, it has to return a drag controller here.
+   * That is an object implementing #AbstractViewItemDragController.
+   */
+  virtual std::unique_ptr<AbstractViewItemDragController> create_drag_controller() const;
+  /**
+   * If an item wants to support dropping data into it, it has to return a drop controller here.
+   * That is an object implementing #AbstractViewItemDropController.
+   *
+   * \note This drop controller may be requested for each event. The view doesn't keep a drop
+   *       controller around currently. So it can not contain persistent state.
+   */
+  virtual std::unique_ptr<AbstractViewItemDropController> create_drop_controller() const;
+
+  /** Get the view this item is registered for using #AbstractView::register_item(). */
+  AbstractView &get_view() const;
+
+  /**
+   * Requires the view to have completed reconstruction, see #is_reconstructed(). Otherwise we
+   * can't be sure about the item state.
+   */
+  bool is_active() const;
+
+  bool is_renaming() const;
+  void begin_renaming();
+  void end_renaming();
+  void rename_apply();
+
+  template<typename ToType = AbstractViewItem>
+  static ToType *from_item_handle(uiViewItemHandle *handle);
+
+ protected:
+  AbstractViewItem() = default;
+
+  /**
+   * Compare this item's identity to \a other to check if they represent the same data.
+   * Implementations can assume that the types match already (caller must check).
+   *
+   * Used to recognize an item from a previous redraw, to be able to keep its state (e.g. active,
+   * renaming, etc.).
+   */
+  virtual bool matches(const AbstractViewItem &other) const = 0;
+
+  /**
+   * Copy persistent state (e.g. active, selection, etc.) from a matching item of
+   * the last redraw to this item. If sub-classes introduce more advanced state they should
+   * override this and make it update their state accordingly.
+   *
+   * \note Always call the base class implementation when overriding this!
+   */
+  virtual void update_from_old(const AbstractViewItem &old);
+
+  /**
+   * Add a text button for renaming the item to \a block. This must be used for the built-in
+   * renaming to work. This button is meant to appear temporarily. It is removed when renaming is
+   * done.
+   */
+  void add_rename_button(uiBlock &block);
+};
+
+template<typename ToType> ToType *AbstractViewItem::from_item_handle(uiViewItemHandle *handle)
+{
+  static_assert(std::is_base_of<AbstractViewItem, ToType>::value,
+                "Type must derive from and implement the AbstractViewItem interface");
+
+  return dynamic_cast<ToType *>(reinterpret_cast<AbstractViewItem *>(handle));
+}
+
+/* ---------------------------------------------------------------------- */
+/** \name Drag 'n Drop
+ * \{ */
+
+/**
+ * Class to enable dragging a view item. An item can return a drop controller for itself by
+ * implementing #AbstractViewItem::create_drag_controller().
+ */
+class AbstractViewItemDragController {
+ protected:
+  AbstractView &view_;
+
+ public:
+  AbstractViewItemDragController(AbstractView &view);
+  virtual ~AbstractViewItemDragController() = default;
+
+  virtual int get_drag_type() const = 0;
+  virtual void *create_drag_data() const = 0;
+  virtual void on_drag_start();
+
+  /** Request the view the item is registered for as type #ViewType. Throws a `std::bad_cast`
+   * exception if the view is not of the requested type. */
+  template<class ViewType> inline ViewType &get_view() const;
+};
+
+/**
+ * Class to define the behavior when dropping something onto/into a view item, plus the behavior
+ * when dragging over this item. An item can return a drop controller for itself via a custom
+ * implementation of #AbstractViewItem::create_drop_controller().
+ */
+class AbstractViewItemDropController {
+ protected:
+  AbstractView &view_;
+
+ public:
+  AbstractViewItemDropController(AbstractView &view);
+  virtual ~AbstractViewItemDropController() = default;
+
+  /**
+   * Check if the data dragged with \a drag can be dropped on the item this controller is for.
+   * \param r_disabled_hint: Return a static string to display to the user, explaining why dropping
+   *                         isn't possible on this item. Shouldn't be done too aggressively, e.g.
+   *                         don't set this if the drag-type can't be dropped here; only if it can
+   *                         but there's another reason it can't be dropped.
+   *                         Can assume this is a non-null pointer.
+   */
+  virtual bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const = 0;
+  /**
+   * Custom text to display when dragging over a view item. Should explain what happens when
+   * dropping the data onto this item. Will only be used if #AbstractViewItem::can_drop()
+   * returns true, so the implementing override doesn't have to check that again.
+   * The returned value must be a translated string.
+   */
+  virtual std::string drop_tooltip(const wmDrag &drag) const = 0;
+  /**
+   * Execute the logic to apply a drop of the data dragged with \a drag onto/into the item this
+   * controller is for.
+   */
+  virtual bool on_drop(struct bContext *C, const wmDrag &drag) = 0;
+
+  /** Request the view the item is registered for as type #ViewType. Throws a `std::bad_cast`
+   * exception if the view is not of the requested type. */
+  template<class ViewType> inline ViewType &get_view() const;
+};
+
+template<class ViewType> ViewType &AbstractViewItemDragController::get_view() const
+{
+  static_assert(std::is_base_of<AbstractView, ViewType>::value,
+                "Type must derive from and implement the ui::AbstractView interface");
+  return dynamic_cast<ViewType &>(view_);
+}
+
+template<class ViewType> ViewType &AbstractViewItemDropController::get_view() const
+{
+  static_assert(std::is_base_of<AbstractView, ViewType>::value,
+                "Type must derive from and implement the ui::AbstractView interface");
+  return dynamic_cast<ViewType &>(view_);
+}
+
+/** \} */
+
 }  // namespace blender::ui
diff --git a/source/blender/editors/include/UI_grid_view.hh b/source/blender/editors/include/UI_grid_view.hh
index cabc49e411c..402c0c8512f 100644
--- a/source/blender/editors/include/UI_grid_view.hh
+++ b/source/blender/editors/include/UI_grid_view.hh
@@ -19,7 +19,7 @@
 struct bContext;
 struct PreviewImage;
 struct uiBlock;
-struct uiButGridTile;
+struct uiButViewItem;
 struct uiLayout;
 struct View2D;
 struct wmNotifier;
@@ -32,43 +32,29 @@ class AbstractGridView;
 /** \name Grid-View Item Type
  * \{ */
 
-class AbstractGridViewItem {
+class AbstractGridViewItem : public AbstractViewItem {
   friend class AbstractGridView;
   friend class GridViewLayoutBuilder;
 
-  const AbstractGridView *view_;
-
-  bool is_active_ = false;
-
  protected:
   /** Reference to a string that uniquely identifies this item in the view. */
   StringRef identifier_{};
-  /** Every visible item gets a button of type #UI_BTYPE_GRID_TILE during the layout building. */
-  uiButGridTile *grid_tile_but_ = nullptr;
+  /** Every visible item gets a button of type #UI_BTYPE_VIEW_ITEM during the layout building. */
+  uiButViewItem *view_item_but_ = nullptr;
 
  public:
   virtual ~AbstractGridViewItem() = default;
 
   virtual void build_grid_tile(uiLayout &layout) const = 0;
 
-  /**
-   * Compare this item's identifier to \a other to check if they represent the same data.
-   * Used to recognize an item from a previous redraw, to be able to keep its state (e.g. active,
-   * renaming, etc.).
-   */
-  bool matches(const AbstractGridViewItem &other) const;
-
   const AbstractGridView &get_view() const;
 
-  /**
-   * Requires the tree to have completed reconstruction, see #is_reconstructed(). Otherwise we
-   * can't be sure about the item state.
-   */
-  bool is_active() const;
-
  protected:
   AbstractGridViewItem(StringRef identifier);
 
+  /** See AbstractViewItem::matches(). */
+  virtual bool matches(const AbstractViewItem &other) const override;
+
   /** Called when the item's state changes from inactive to active. */
   virtual void on_activate();
   /**
@@ -78,13 +64,6 @@ class AbstractGridViewItem {
   virtual std::optional<bool> should_be_active() const;
 
   /**
-   * Copy persistent state (e.g. active, selection, etc.) from a matching item of
-   * the last redraw to this item. If sub-classes introduce more advanced state they should
-   * override this and make it update their state accordingly.
-   */
-  virtual void update_from_old(const AbstractGridViewItem &old);
-
-  /**
    * Activates this item, deactivates other items, and calls the
    * #AbstractGridViewItem::on_activate() function.
    * Requires the tree to have completed reconstruction, see #is_reconstructed(). Otherwise the
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index f39c62d8e2b..c3376493413 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -74,10 +74,8 @@ typedef struct uiLayout uiLayout;
 typedef struct uiPopupBlockHandle uiPopupBlockHandle;
 /* C handle for C++ #ui::AbstractView type. */
 typedef struct uiViewHandle uiViewHandle;
-/* C handle for C++ #ui::AbstractTreeViewItem type. */
-typedef struct uiTreeViewItemHandle uiTreeViewItemHandle;
-/* C handle for C++ #ui::AbstractGridViewItem type. */
-typedef struct uiGridViewItemHandle uiGridViewItemHandle;
+/* C handle for C++ #ui::AbstractViewItem type. */
+typedef struct uiViewItemHandle uiViewItemHandle;
 
 /* Defines */
 
@@ -87,7 +85,7 @@ typedef struct uiGridViewItemHandle uiGridViewItemHandle;
 
 /* Separator for text in search menus (right pointing arrow).
  * keep in sync with `string_search.cc`. */
-#define UI_MENU_ARROW_SEP "\xe2\x96\xb6"
+#define UI_MENU_ARROW_SEP "\xe2\x96\xb8"
 
 /* names */
 #define UI_MAX_DRAW_STR 400
@@ -356,7 +354,7 @@ typedef enum {
   UI_BTYPE_LABEL = 20 << 9,
   UI_BTYPE_KEY_EVENT = 24 << 9,
   UI_BTYPE_HSVCUBE = 26 << 9,
-  /** menu (often used in headers), **_MENU /w different draw-type */
+  /** Menu (often used in headers), `*_MENU` with different draw-type. */
   UI_BTYPE_PULLDOWN = 27 << 9,
   UI_BTYPE_ROUNDBOX = 28 << 9,
   UI_BTYPE_COLORBAND = 30 << 9,
@@ -391,10 +389,8 @@ typedef enum {
   /** Resize handle (resize uilist). */
   UI_BTYPE_GRIP = 57 << 9,
   UI_BTYPE_DECORATOR = 58 << 9,
-  /* An item in a tree view. Parent items may be collapsible. */
-  UI_BTYPE_TREEROW = 59 << 9,
-  /* An item in a grid view. */
-  UI_BTYPE_GRID_TILE = 60 << 9,
+  /* An item a view (see #ui::AbstractViewItem). */
+  UI_BTYPE_VIEW_ITEM = 59 << 9,
 } eButType;
 
 #define BUTTYPE (63 << 9)
@@ -536,6 +532,7 @@ typedef struct ARegion *(*uiButSearchTooltipFn)(struct bContext *C,
                                                 const struct rcti *item_rect,
                                                 void *arg,
                                                 void *active);
+typedef void (*uiButSearchListenFn)(const struct wmRegionListenerParams *params, void *arg);
 
 /* Must return allocated string. */
 typedef char *(*uiButToolTipFunc)(struct bContext *C, void *argN, const char *tip);
@@ -1663,6 +1660,7 @@ void UI_but_func_search_set(uiBut *but,
                             void *active);
 void UI_but_func_search_set_context_menu(uiBut *but, uiButSearchContextMenuFn context_menu_fn);
 void UI_but_func_search_set_tooltip(uiBut *but, uiButSearchTooltipFn tooltip_fn);
+void UI_but_func_search_set_listen(uiBut *but, uiButSearchListenFn listen_fn);
 /**
  * \param search_sep_string: when not NULL, this string is used as a separator,
  * showing the icon and highlighted text after the last instance of this string.
@@ -1685,8 +1683,6 @@ int UI_search_items_find_index(uiSearchItems *items, const char *name);
  */
 void UI_but_hint_drawstr_set(uiBut *but, const char *string);
 
-void UI_but_treerow_indentation_set(uiBut *but, int indentation);
-
 void UI_but_node_link_set(uiBut *but, struct bNodeSocket *socket, const float draw_color[4]);
 
 void UI_but_number_step_size_set(uiBut *but, float step_size);
@@ -2488,7 +2484,7 @@ enum uiTemplateListFlags {
 ENUM_OPERATORS(enum uiTemplateListFlags, UI_TEMPLATE_LIST_FLAGS_LAST);
 
 void uiTemplateList(uiLayout *layout,
-                    struct bContext *C,
+                    const struct bContext *C,
                     const char *listtype_name,
                     const char *list_id,
                     struct PointerRNA *dataptr,
@@ -2502,7 +2498,7 @@ void uiTemplateList(uiLayout *layout,
                     int columns,
                     enum uiTemplateListFlags flags);
 struct uiList *uiTemplateList_ex(uiLayout *layout,
-                                 struct bContext *C,
+                                 const struct bContext *C,
                                  const char *listtype_name,
                                  const char *list_id,
                                  struct PointerRNA *dataptr,
@@ -2572,7 +2568,7 @@ enum {
   UI_TEMPLATE_ASSET_DRAW_NO_LIBRARY = (1 << 2),
 };
 void uiTemplateAssetView(struct uiLayout *layout,
-                         struct bContext *C,
+                         const struct bContext *C,
                          const char *list_id,
                          struct PointerRNA *asset_library_dataptr,
                          const char *asset_library_propname,
@@ -3201,45 +3197,44 @@ void UI_interface_tag_script_reload(void);
 void UI_block_views_listen(const uiBlock *block,
                            const struct wmRegionListenerParams *listener_params);
 
-bool UI_grid_view_item_is_active(const uiGridViewItemHandle *item_handle);
-bool UI_tree_view_item_is_active(const uiTreeViewItemHandle *item);
-bool UI_grid_view_item_matches(const uiGridViewItemHandle *a, const uiGridViewItemHandle *b);
-bool UI_tree_view_item_matches(const uiTreeViewItemHandle *a, const uiTreeViewItemHandle *b);
+bool UI_view_item_is_active(const uiViewItemHandle *item_handle);
+bool UI_view_item_matches(const uiViewItemHandle *a_handle, const uiViewItemHandle *b_handle);
 /**
- * Attempt to start dragging the tree-item \a item_. This will not work if the tree item doesn't
- * support dragging, i.e. it won't create a drag-controller upon request.
- * \return True if dragging started successfully, otherwise false.
+ * Can \a item_handle be renamed right now? Note that this isn't just a mere wrapper around
+ * #AbstractViewItem::supports_renaming(). This also checks if there is another item being renamed,
+ * and returns false if so.
  */
-bool UI_tree_view_item_drag_start(struct bContext *C, uiTreeViewItemHandle *item_);
-bool UI_tree_view_item_can_drop(const uiTreeViewItemHandle *item_,
-                                const struct wmDrag *drag,
-                                const char **r_disabled_hint);
-char *UI_tree_view_item_drop_tooltip(const uiTreeViewItemHandle *item, const struct wmDrag *drag);
+bool UI_view_item_can_rename(const uiViewItemHandle *item_handle);
+void UI_view_item_begin_rename(uiViewItemHandle *item_handle);
+
+void UI_view_item_context_menu_build(struct bContext *C,
+                                     const uiViewItemHandle *item_handle,
+                                     uiLayout *column);
+
 /**
- * Let a tree-view item handle a drop event.
- * \return True if the drop was handled by the tree-view item.
+ * Attempt to start dragging \a item_. This will not work if the view item doesn't
+ * support dragging, i.e. if it won't create a drag-controller upon request.
+ * \return True if dragging started successfully, otherwise false.
  */
-bool UI_tree_view_item_drop_handle(struct bContext *C,
-                                   const uiTreeViewItemHandle *item_,
-                                   const struct ListBase *drags);
+bool UI_view_item_drag_start(struct bContext *C, const uiViewItemHandle *item_);
+bool UI_view_item_can_drop(const uiViewItemHandle *item_,
+                           const struct wmDrag *drag,
+                           const char **r_disabled_hint);
+char *UI_view_item_drop_tooltip(const uiViewItemHandle *item, const struct wmDrag *drag);
 /**
- * Can \a item_handle be renamed right now? Not that this isn't just a mere wrapper around
- * #AbstractTreeViewItem::can_rename(). This also checks if there is another item being renamed,
- * and returns false if so.
+ * Let a view item handle a drop event.
+ * \return True if the drop was handled by the view item.
  */
-bool UI_tree_view_item_can_rename(const uiTreeViewItemHandle *item_handle);
-void UI_tree_view_item_begin_rename(uiTreeViewItemHandle *item_handle);
-
-void UI_tree_view_item_context_menu_build(struct bContext *C,
-                                          const uiTreeViewItemHandle *item,
-                                          uiLayout *column);
+bool UI_view_item_drop_handle(struct bContext *C,
+                              const uiViewItemHandle *item_,
+                              const struct ListBase *drags);
 
 /**
- * \param xy: Coordinate to find a tree-row item at, in window space.
+ * \param xy: Coordinate to find a view item at, in window space.
  */
-uiTreeViewItemHandle *UI_block_tree_view_find_item_at(const struct ARegion *region,
-                                                      const int xy[2]) ATTR_NONNULL(1, 2);
-uiTreeViewItemHandle *UI_block_tree_view_find_active_item(const struct ARegion *region);
+uiViewItemHandle *UI_region_views_find_item_at(const struct ARegion *region, const int xy[2])
+    ATTR_NONNULL();
+uiViewItemHandle *UI_region_views_find_active_item(const struct ARegion *region);
 
 #ifdef __cplusplus
 }
diff --git a/source/blender/editors/include/UI_interface.hh b/source/blender/editors/include/UI_interface.hh
index 82bfdd7e212..6c756984203 100644
--- a/source/blender/editors/include/UI_interface.hh
+++ b/source/blender/editors/include/UI_interface.hh
@@ -13,7 +13,7 @@
 
 #include "UI_resources.h"
 
-namespace blender::nodes::geometry_nodes_eval_log {
+namespace blender::nodes::geo_eval_log {
 struct GeometryAttributeInfo;
 }
 
@@ -44,12 +44,11 @@ void context_path_add_generic(Vector<ContextPathItem> &path,
 
 void template_breadcrumbs(uiLayout &layout, Span<ContextPathItem> context_path);
 
-void attribute_search_add_items(
-    StringRefNull str,
-    bool can_create_attribute,
-    Span<const nodes::geometry_nodes_eval_log::GeometryAttributeInfo *> infos,
-    uiSearchItems *items,
-    bool is_first);
+void attribute_search_add_items(StringRefNull str,
+                                bool can_create_attribute,
+                                Span<const nodes::geo_eval_log::GeometryAttributeInfo *> infos,
+                                uiSearchItems *items,
+                                bool is_first);
 
 }  // namespace blender::ui
 
diff --git a/source/blender/editors/include/UI_resources.h b/source/blender/editors/include/UI_resources.h
index 22e747e37ad..9a46728097c 100644
--- a/source/blender/editors/include/UI_resources.h
+++ b/source/blender/editors/include/UI_resources.h
@@ -291,6 +291,8 @@ typedef enum ThemeColorID {
 
   TH_WIDGET_EMBOSS,
   TH_WIDGET_TEXT_CURSOR,
+  TH_WIDGET_TEXT_SELECTION,
+  TH_WIDGET_TEXT_HIGHLIGHT,
   TH_EDITOR_OUTLINE,
 
   TH_TRANSPARENT_CHECKER_PRIMARY,
diff --git a/source/blender/editors/include/UI_tree_view.hh b/source/blender/editors/include/UI_tree_view.hh
index 9527df590b7..872a6085060 100644
--- a/source/blender/editors/include/UI_tree_view.hh
+++ b/source/blender/editors/include/UI_tree_view.hh
@@ -9,7 +9,6 @@
 
 #pragma once
 
-#include <array>
 #include <functional>
 #include <memory>
 #include <string>
@@ -25,18 +24,13 @@
 struct bContext;
 struct uiBlock;
 struct uiBut;
-struct uiButTreeRow;
+struct uiButViewItem;
 struct uiLayout;
-struct wmDrag;
-struct wmEvent;
-struct wmNotifier;
 
 namespace blender::ui {
 
 class AbstractTreeView;
 class AbstractTreeViewItem;
-class AbstractTreeViewItemDropController;
-class AbstractTreeViewItemDragController;
 
 /* ---------------------------------------------------------------------- */
 /** \name Tree-View Item Container
@@ -153,7 +147,7 @@ class AbstractTreeView : public AbstractView, public TreeViewItemContainer {
  * It also stores state information that needs to be persistent over redraws, like the collapsed
  * state.
  */
-class AbstractTreeViewItem : public TreeViewItemContainer {
+class AbstractTreeViewItem : public AbstractViewItem, public TreeViewItemContainer {
   friend class AbstractTreeView;
   friend class TreeViewLayoutBuilder;
   /* Higher-level API. */
@@ -161,20 +155,17 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
 
  private:
   bool is_open_ = false;
-  bool is_active_ = false;
-  bool is_renaming_ = false;
 
  protected:
   /** This label is used as the default way to identifying an item within its parent. */
   std::string label_{};
-  /** Every visible item gets a button of type #UI_BTYPE_TREEROW during the layout building. */
-  uiButTreeRow *tree_row_but_ = nullptr;
+  /** Every visible item gets a button of type #UI_BTYPE_VIEW_ITEM during the layout building. */
+  uiButViewItem *view_item_but_ = nullptr;
 
  public:
   virtual ~AbstractTreeViewItem() = default;
 
   virtual void build_row(uiLayout &row) = 0;
-  virtual void build_context_menu(bContext &C, uiLayout &column) const;
 
   AbstractTreeView &get_tree_view() const;
 
@@ -186,11 +177,6 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
    * can't be sure about the item state.
    */
   bool is_collapsed() const;
-  /**
-   * Requires the tree to have completed reconstruction, see #is_reconstructed(). Otherwise we
-   * can't be sure about the item state.
-   */
-  bool is_active() const;
 
  protected:
   /**
@@ -203,31 +189,21 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
    */
   virtual std::optional<bool> should_be_active() const;
 
-  /**
-   * Queries if the tree-view item supports renaming in principle. Renaming may still fail, e.g. if
-   * another item is already being renamed.
-   */
-  virtual bool supports_renaming() const;
-  /**
-   * Try renaming the item, or the data it represents. Can assume
-   * #AbstractTreeViewItem::supports_renaming() returned true. Sub-classes that override this
-   * should usually call this, unless they have a custom #AbstractTreeViewItem.matches().
-   *
-   * \return True if the renaming was successful.
-   */
-  virtual bool rename(StringRefNull new_name);
+  /** See AbstractViewItem::get_rename_string(). */
+  virtual StringRef get_rename_string() const override;
+  /** See AbstractViewItem::rename(). */
+  virtual bool rename(StringRefNull new_name) override;
 
   /**
    * Return whether the item can be collapsed. Used to disable collapsing for items with children.
    */
   virtual bool supports_collapsing() const;
 
-  /**
-   * Copy persistent state (e.g. is-collapsed flag, selection, etc.) from a matching item of
-   * the last redraw to this item. If sub-classes introduce more advanced state they should
-   * override this and make it update their state accordingly.
-   */
-  virtual void update_from_old(const AbstractTreeViewItem &old);
+  /** See #AbstractViewItem::matches(). */
+  virtual bool matches(const AbstractViewItem &other) const override;
+
+  /** See #AbstractViewItem::update_from_old(). */
+  virtual void update_from_old(const AbstractViewItem &old) override;
 
   /**
    * Compare this item to \a other to check if they represent the same data.
@@ -235,22 +211,11 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
    * open/closed, active, etc.). Items are only matched if their parents also match.
    * By default this just matches the item's label (if the parents match!). If that isn't
    * good enough for a sub-class, that can override it.
-   */
-  virtual bool matches(const AbstractTreeViewItem &other) const;
-
-  /**
-   * If an item wants to support being dragged, it has to return a drag controller here.
-   * That is an object implementing #AbstractTreeViewItemDragController.
-   */
-  virtual std::unique_ptr<AbstractTreeViewItemDragController> create_drag_controller() const;
-  /**
-   * If an item wants to support dropping data into it, it has to return a drop controller here.
-   * That is an object implementing #AbstractTreeViewItemDropController.
    *
-   * \note This drop controller may be requested for each event. The tree-view doesn't keep a drop
-   *       controller around currently. So it can not contain persistent state.
+   * TODO #matches_single() is a rather temporary name, used to indicate that this only compares
+   * the item itself, not the parents. Item matching is expected to change quite a bit anyway.
    */
-  virtual std::unique_ptr<AbstractTreeViewItemDropController> create_drop_controller() const;
+  virtual bool matches_single(const AbstractTreeViewItem &other) const;
 
   /**
    * Activates this item, deactivates other items, calls the #AbstractTreeViewItem::on_activate()
@@ -268,29 +233,24 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
    */
   bool is_hovered() const;
   bool is_collapsible() const;
-  bool is_renaming() const;
 
   void ensure_parents_uncollapsed();
 
-  uiButTreeRow *tree_row_button();
+  uiButViewItem *view_item_button();
 
  private:
-  static void rename_button_fn(bContext *, void *, char *);
-  static AbstractTreeViewItem *find_tree_item_from_rename_button(const uiBut &but);
   static void tree_row_click_fn(struct bContext *, void *, void *);
   static void collapse_chevron_click_fn(bContext *, void *but_arg1, void *);
   static bool is_collapse_chevron_but(const uiBut *but);
 
   /** See #AbstractTreeView::change_state_delayed() */
   void change_state_delayed();
-  void end_renaming();
 
   void add_treerow_button(uiBlock &block);
   void add_indent(uiLayout &row) const;
   void add_collapse_chevron(uiBlock &block) const;
   void add_rename_button(uiLayout &row);
 
-  bool matches_including_parents(const AbstractTreeViewItem &other) const;
   bool has_active_child() const;
   int count_parents() const;
 };
@@ -298,69 +258,6 @@ class AbstractTreeViewItem : public TreeViewItemContainer {
 /** \} */
 
 /* ---------------------------------------------------------------------- */
-/** \name Drag 'n Drop
- * \{ */
-
-/**
- * Class to enable dragging a tree-item. An item can return a drop controller for itself via a
- * custom implementation of #AbstractTreeViewItem::create_drag_controller().
- */
-class AbstractTreeViewItemDragController {
- protected:
-  AbstractTreeView &tree_view_;
-
- public:
-  AbstractTreeViewItemDragController(AbstractTreeView &tree_view);
-  virtual ~AbstractTreeViewItemDragController() = default;
-
-  virtual int get_drag_type() const = 0;
-  virtual void *create_drag_data() const = 0;
-  virtual void on_drag_start();
-
-  template<class TreeViewType> inline TreeViewType &tree_view() const;
-};
-
-/**
- * Class to customize the drop behavior of a tree-item, plus the behavior when dragging over this
- * item. An item can return a drop controller for itself via a custom implementation of
- * #AbstractTreeViewItem::create_drop_controller().
- */
-class AbstractTreeViewItemDropController {
- protected:
-  AbstractTreeView &tree_view_;
-
- public:
-  AbstractTreeViewItemDropController(AbstractTreeView &tree_view);
-  virtual ~AbstractTreeViewItemDropController() = default;
-
-  /**
-   * Check if the data dragged with \a drag can be dropped on the item this controller is for.
-   * \param r_disabled_hint: Return a static string to display to the user, explaining why dropping
-   *                         isn't possible on this item. Shouldn't be done too aggressively, e.g.
-   *                         don't set this if the drag-type can't be dropped here; only if it can
-   *                         but there's another reason it can't be dropped.
-   *                         Can assume this is a non-null pointer.
-   */
-  virtual bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const = 0;
-  /**
-   * Custom text to display when dragging over a tree item. Should explain what happens when
-   * dropping the data onto this item. Will only be used if #AbstractTreeViewItem::can_drop()
-   * returns true, so the implementing override doesn't have to check that again.
-   * The returned value must be a translated string.
-   */
-  virtual std::string drop_tooltip(const wmDrag &drag) const = 0;
-  /**
-   * Execute the logic to apply a drop of the data dragged with \a drag onto/into the item this
-   * controller is for.
-   */
-  virtual bool on_drop(struct bContext *C, const wmDrag &drag) = 0;
-
-  template<class TreeViewType> inline TreeViewType &tree_view() const;
-};
-
-/** \} */
-
-/* ---------------------------------------------------------------------- */
 /** \name Predefined Tree-View Item Types
  *
  *  Common, Basic Tree-View Item Types.
@@ -431,18 +328,4 @@ inline ItemT &TreeViewItemContainer::add_tree_item(Args &&...args)
       add_tree_item(std::make_unique<ItemT>(std::forward<Args>(args)...)));
 }
 
-template<class TreeViewType> TreeViewType &AbstractTreeViewItemDragController::tree_view() const
-{
-  static_assert(std::is_base_of<AbstractTreeView, TreeViewType>::value,
-                "Type must derive from and implement the AbstractTreeView interface");
-  return static_cast<TreeViewType &>(tree_view_);
-}
-
-template<class TreeViewType> TreeViewType &AbstractTreeViewItemDropController::tree_view() const
-{
-  static_assert(std::is_base_of<AbstractTreeView, TreeViewType>::value,
-                "Type must derive from and implement the AbstractTreeView interface");
-  return static_cast<TreeViewType &>(tree_view_);
-}
-
 }  // namespace blender::ui
diff --git a/source/blender/editors/include/UI_view2d.h b/source/blender/editors/include/UI_view2d.h
index 5c4eb254462..bdd830e0046 100644
--- a/source/blender/editors/include/UI_view2d.h
+++ b/source/blender/editors/include/UI_view2d.h
@@ -54,7 +54,7 @@ enum eView2D_CommonViewTypes {
 #define V2D_SCROLL_HEIGHT ((0.45f * U.widget_unit) + (2.0f * U.pixelsize))
 #define V2D_SCROLL_WIDTH ((0.45f * U.widget_unit) + (2.0f * U.pixelsize))
 
-/* Alpha of scrollbar when at minimum size. */
+/* Alpha of scroll-bar when at minimum size. */
 #define V2D_SCROLL_MIN_ALPHA (0.4f)
 
 /* Minimum size needs to include outline which varies with line width. */
@@ -84,7 +84,7 @@ enum eView2D_CommonViewTypes {
 /* ------------------------------------------ */
 /* Macros:                                    */
 
-/* test if mouse in a scrollbar (assume that scroller availability has been tested) */
+/* Test if mouse in a scroll-bar (assume that scroller availability has been tested). */
 #define IN_2D_VERT_SCROLL(v2d, co) (BLI_rcti_isect_pt_v(&v2d->vert, co))
 #define IN_2D_HORIZ_SCROLL(v2d, co) (BLI_rcti_isect_pt_v(&v2d->hor, co))
 
@@ -309,6 +309,12 @@ float UI_view2d_view_to_region_y(const struct View2D *v2d, float y);
 bool UI_view2d_view_to_region_clip(
     const struct View2D *v2d, float x, float y, int *r_region_x, int *r_region_y) ATTR_NONNULL();
 
+bool UI_view2d_view_to_region_segment_clip(const View2D *v2d,
+                                           const float xy_a[2],
+                                           const float xy_b[2],
+                                           int r_region_a[2],
+                                           int r_region_b[2]) ATTR_NONNULL();
+
 /**
  * Convert from 2d-view space to screen/region space
  *
@@ -344,8 +350,8 @@ struct View2D *UI_view2d_fromcontext(const struct bContext *C);
 struct View2D *UI_view2d_fromcontext_rwin(const struct bContext *C);
 
 /**
- * Get scrollbar sizes of the current 2D view.
- * The size will be zero if the view has its scrollbars disabled.
+ * Get scroll-bar sizes of the current 2D view.
+ * The size will be zero if the view has its scroll-bars disabled.
  *
  * \param mapped: whether to use view2d_scroll_mapped which changes flags
  */
diff --git a/source/blender/editors/interface/CMakeLists.txt b/source/blender/editors/interface/CMakeLists.txt
index 1bdec57ac59..6a531c88762 100644
--- a/source/blender/editors/interface/CMakeLists.txt
+++ b/source/blender/editors/interface/CMakeLists.txt
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set(INC
+  .
   ../include
   ../../blenfont
   ../../blenkernel
@@ -18,37 +19,35 @@ set(INC
   ../../python
   ../../render
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
+  ../../bmesh
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
 )
 
 set(SRC
-  abstract_view.cc
-  grid_view.cc
+  eyedroppers/eyedropper_color.c
+  eyedroppers/eyedropper_colorband.c
+  eyedroppers/eyedropper_datablock.c
+  eyedroppers/eyedropper_depth.c
+  eyedroppers/eyedropper_driver.c
+  eyedroppers/eyedropper_gpencil_color.c
+  eyedroppers/interface_eyedropper.c
   interface.cc
   interface_align.c
-  interface_anim.c
+  interface_anim.cc
   interface_button_group.c
   interface_context_menu.c
   interface_context_path.cc
   interface_drag.cc
   interface_draw.c
   interface_dropboxes.cc
-  interface_eyedropper.c
-  interface_eyedropper_color.c
-  interface_eyedropper_colorband.c
-  interface_eyedropper_datablock.c
-  interface_eyedropper_depth.c
-  interface_eyedropper_driver.c
-  interface_eyedropper_gpencil_color.c
   interface_handlers.c
   interface_icons.c
   interface_icons_event.c
   interface_layout.c
-  interface_ops.c
-  interface_panel.c
+  interface_ops.cc
+  interface_panel.cc
   interface_query.cc
   interface_region_color_picker.cc
   interface_region_hud.cc
@@ -57,30 +56,33 @@ set(SRC
   interface_region_popover.cc
   interface_region_popup.cc
   interface_region_search.cc
-  interface_region_tooltip.c
+  interface_region_tooltip.cc
   interface_regions.cc
   interface_style.cc
   interface_template_asset_view.cc
   interface_template_attribute_search.cc
   interface_template_list.cc
   interface_template_search_menu.cc
-  interface_template_search_operator.c
+  interface_template_search_operator.cc
   interface_templates.c
-  interface_undo.c
+  interface_undo.cc
   interface_utils.cc
-  interface_view.cc
   interface_widgets.c
   resources.c
-  tree_view.cc
   view2d.cc
   view2d_draw.cc
   view2d_edge_pan.cc
   view2d_gizmo_navigate.cc
   view2d_ops.cc
+  views/abstract_view.cc
+  views/abstract_view_item.cc
+  views/grid_view.cc
+  views/interface_view.cc
+  views/tree_view.cc
 
-  interface_eyedropper_intern.h
+  eyedroppers/eyedropper_intern.h
   interface_intern.h
-  interface_regions_intern.h
+  interface_regions_intern.hh
 )
 
 set(LIB
diff --git a/source/blender/editors/interface/interface_eyedropper_color.c b/source/blender/editors/interface/eyedroppers/eyedropper_color.c
index c015a60de89..9c430afd5f0 100644
--- a/source/blender/editors/interface/interface_eyedropper_color.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_color.c
@@ -50,7 +50,7 @@
 
 #include "RE_pipeline.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 
 typedef struct Eyedropper {
   struct ColorManagedDisplay *display;
@@ -479,7 +479,7 @@ static int eyedropper_modal(bContext *C, wmOperator *op, const wmEvent *event)
         break;
     }
   }
-  else if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  else if (ISMOUSE_MOTION(event->type)) {
     if (eye->accum_start) {
       /* button is pressed so keep sampling */
       eyedropper_color_sample(C, eye, event->xy);
diff --git a/source/blender/editors/interface/interface_eyedropper_colorband.c b/source/blender/editors/interface/eyedroppers/eyedropper_colorband.c
index a69c36fefbd..3f63a8020ed 100644
--- a/source/blender/editors/interface/interface_eyedropper_colorband.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_colorband.c
@@ -35,7 +35,7 @@
 
 #include "interface_intern.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 
 typedef struct Colorband_RNAUpdateCb {
   PointerRNA ptr;
diff --git a/source/blender/editors/interface/interface_eyedropper_datablock.c b/source/blender/editors/interface/eyedroppers/eyedropper_datablock.c
index 01b958576b6..1710d0faa4d 100644
--- a/source/blender/editors/interface/interface_eyedropper_datablock.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_datablock.c
@@ -38,7 +38,7 @@
 #include "ED_space_api.h"
 #include "ED_view3d.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 #include "interface_intern.h"
 
 /**
diff --git a/source/blender/editors/interface/interface_eyedropper_depth.c b/source/blender/editors/interface/eyedroppers/eyedropper_depth.c
index 3c6f127582a..3fb5a74944b 100644
--- a/source/blender/editors/interface/interface_eyedropper_depth.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_depth.c
@@ -38,7 +38,7 @@
 #include "ED_space_api.h"
 #include "ED_view3d.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 #include "interface_intern.h"
 
 /**
diff --git a/source/blender/editors/interface/interface_eyedropper_driver.c b/source/blender/editors/interface/eyedroppers/eyedropper_driver.c
index 0cacb55c60c..0f3062c3f61 100644
--- a/source/blender/editors/interface/interface_eyedropper_driver.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_driver.c
@@ -24,6 +24,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h"
+#include "RNA_path.h"
 
 #include "UI_interface.h"
 
@@ -32,7 +33,7 @@
 
 #include "ED_keyframing.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 #include "interface_intern.h"
 
 typedef struct DriverDropper {
@@ -83,14 +84,14 @@ static void driverdropper_sample(bContext *C, wmOperator *op, const wmEvent *eve
   if (but == NULL) {
     return;
   }
-  /* Get paths for src... */
+  /* Get paths for the source. */
   PointerRNA *target_ptr = &but->rnapoin;
   PropertyRNA *target_prop = but->rnaprop;
   const int target_index = but->rnaindex;
 
   char *target_path = RNA_path_from_ID_to_property(target_ptr, target_prop);
 
-  /* ... and destination */
+  /* Get paths for the destination. */
   char *dst_path = RNA_path_from_ID_to_property(&ddr->ptr, ddr->prop);
 
   /* Now create driver(s) */
diff --git a/source/blender/editors/interface/interface_eyedropper_gpencil_color.c b/source/blender/editors/interface/eyedroppers/eyedropper_gpencil_color.c
index f3c70e6a96a..c3879fe8bbd 100644
--- a/source/blender/editors/interface/interface_eyedropper_gpencil_color.c
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_gpencil_color.c
@@ -46,7 +46,7 @@
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_build.h"
 
-#include "interface_eyedropper_intern.h"
+#include "eyedropper_intern.h"
 #include "interface_intern.h"
 
 typedef struct EyedropperGPencil {
diff --git a/source/blender/editors/interface/interface_eyedropper_intern.h b/source/blender/editors/interface/eyedroppers/eyedropper_intern.h
index 76316a85807..946f2145d1d 100644
--- a/source/blender/editors/interface/interface_eyedropper_intern.h
+++ b/source/blender/editors/interface/eyedroppers/eyedropper_intern.h
@@ -3,7 +3,7 @@
 /** \file
  * \ingroup edinterface
  *
- * Share between interface_eyedropper_*.c files.
+ * Share between `interface/eyedropper/` files.
  */
 
 #pragma once
@@ -35,7 +35,7 @@ void datadropper_win_area_find(const struct bContext *C,
  *
  * Special check for image or nodes where we MAY have HDR pixels which don't display.
  *
- * \note Exposed by 'interface_eyedropper_intern.h' for use with color band picking.
+ * \note Exposed by 'eyedropper_intern.h' for use with color band picking.
  */
 void eyedropper_color_sample_fl(bContext *C, const int m_xy[2], float r_col[3]);
 
diff --git a/source/blender/editors/interface/interface_eyedropper.c b/source/blender/editors/interface/eyedroppers/interface_eyedropper.c
index eaec1e249b7..e49955512a1 100644
--- a/source/blender/editors/interface/interface_eyedropper.c
+++ b/source/blender/editors/interface/eyedroppers/interface_eyedropper.c
@@ -21,7 +21,7 @@
 
 #include "interface_intern.h"
 
-#include "interface_eyedropper_intern.h" /* own include */
+#include "eyedropper_intern.h" /* own include */
 
 /* -------------------------------------------------------------------- */
 /* Keymap
@@ -41,7 +41,7 @@ wmKeyMap *eyedropper_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Eyedropper Modal Map");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return NULL;
   }
diff --git a/source/blender/editors/interface/interface.cc b/source/blender/editors/interface/interface.cc
index 3f623566807..64f7e035d3f 100644
--- a/source/blender/editors/interface/interface.cc
+++ b/source/blender/editors/interface/interface.cc
@@ -153,8 +153,8 @@ void ui_block_to_window(const ARegion *region, uiBlock *block, int *r_x, int *r_
 
   ui_block_to_window_fl(region, block, &fx, &fy);
 
-  *r_x = (int)(fx + 0.5f);
-  *r_y = (int)(fy + 0.5f);
+  *r_x = (int)lround(fx);
+  *r_y = (int)lround(fy);
 }
 
 void ui_block_to_region_rctf(const ARegion *region,
@@ -232,8 +232,8 @@ void ui_window_to_block(const ARegion *region, uiBlock *block, int *r_x, int *r_
 
   ui_window_to_block_fl(region, block, &fx, &fy);
 
-  *r_x = (int)(fx + 0.5f);
-  *r_y = (int)(fy + 0.5f);
+  *r_x = (int)lround(fx);
+  *r_y = (int)lround(fy);
 }
 
 void ui_window_to_region(const ARegion *region, int *r_x, int *r_y)
@@ -769,20 +769,11 @@ static bool ui_but_equals_old(const uiBut *but, const uiBut *oldbut)
     return false;
   }
 
-  if ((but->type == UI_BTYPE_TREEROW) && (oldbut->type == UI_BTYPE_TREEROW)) {
-    uiButTreeRow *but_treerow = (uiButTreeRow *)but;
-    uiButTreeRow *oldbut_treerow = (uiButTreeRow *)oldbut;
-    if (!but_treerow->tree_item || !oldbut_treerow->tree_item ||
-        !UI_tree_view_item_matches(but_treerow->tree_item, oldbut_treerow->tree_item)) {
-      return false;
-    }
-  }
-
-  if ((but->type == UI_BTYPE_GRID_TILE) && (oldbut->type == UI_BTYPE_GRID_TILE)) {
-    uiButGridTile *but_gridtile = (uiButGridTile *)but;
-    uiButGridTile *oldbut_gridtile = (uiButGridTile *)oldbut;
-    if (!but_gridtile->view_item || !oldbut_gridtile->view_item ||
-        !UI_grid_view_item_matches(but_gridtile->view_item, oldbut_gridtile->view_item)) {
+  if ((but->type == UI_BTYPE_VIEW_ITEM) && (oldbut->type == UI_BTYPE_VIEW_ITEM)) {
+    uiButViewItem *but_item = (uiButViewItem *)but;
+    uiButViewItem *oldbut_item = (uiButViewItem *)oldbut;
+    if (!but_item->view_item || !oldbut_item->view_item ||
+        !UI_view_item_matches(but_item->view_item, oldbut_item->view_item)) {
       return false;
     }
   }
@@ -907,16 +898,10 @@ static void ui_but_update_old_active_from_new(uiBut *oldbut, uiBut *but)
       progress_oldbut->progress = progress_but->progress;
       break;
     }
-    case UI_BTYPE_TREEROW: {
-      uiButTreeRow *treerow_oldbut = (uiButTreeRow *)oldbut;
-      uiButTreeRow *treerow_newbut = (uiButTreeRow *)but;
-      SWAP(uiTreeViewItemHandle *, treerow_newbut->tree_item, treerow_oldbut->tree_item);
-      break;
-    }
-    case UI_BTYPE_GRID_TILE: {
-      uiButGridTile *gridtile_oldbut = (uiButGridTile *)oldbut;
-      uiButGridTile *gridtile_newbut = (uiButGridTile *)but;
-      SWAP(uiGridViewItemHandle *, gridtile_newbut->view_item, gridtile_oldbut->view_item);
+    case UI_BTYPE_VIEW_ITEM: {
+      uiButViewItem *view_item_oldbut = (uiButViewItem *)oldbut;
+      uiButViewItem *view_item_newbut = (uiButViewItem *)but;
+      SWAP(uiViewItemHandle *, view_item_newbut->view_item, view_item_oldbut->view_item);
       break;
     }
     default:
@@ -1013,7 +998,7 @@ static bool ui_but_update_from_old_block(const bContext *C,
 
     /* Stupid special case: The active button may be inside (as in, overlapped on top) a view-item
      * button which we also want to keep highlighted then. */
-    if (ui_but_is_view_item(but)) {
+    if (but->type == UI_BTYPE_VIEW_ITEM) {
       flag_copy |= UI_ACTIVE;
     }
 
@@ -1325,7 +1310,7 @@ static bool ui_but_event_operator_string_from_panel(const bContext *C,
   IDP_AddToGroup(prop_panel, IDP_New(IDP_INT, &region_type_val, "region_type"));
 
   for (int i = 0; i < 2; i++) {
-    /* FIXME(campbell): We can't reasonably search all configurations - long term. */
+    /* FIXME(@campbellbarton): We can't reasonably search all configurations - long term. */
     IDPropertyTemplate val = {0};
     val.i = i;
 
@@ -2245,21 +2230,12 @@ int ui_but_is_pushed_ex(uiBut *but, double *value)
           }
         }
         break;
-      case UI_BTYPE_TREEROW: {
-        uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
+      case UI_BTYPE_VIEW_ITEM: {
+        const uiButViewItem *view_item_but = (const uiButViewItem *)but;
 
         is_push = -1;
-        if (tree_row_but->tree_item) {
-          is_push = UI_tree_view_item_is_active(tree_row_but->tree_item);
-        }
-        break;
-      }
-      case UI_BTYPE_GRID_TILE: {
-        uiButGridTile *grid_tile_but = (uiButGridTile *)but;
-
-        is_push = -1;
-        if (grid_tile_but->view_item) {
-          is_push = UI_grid_view_item_is_active(grid_tile_but->view_item);
+        if (view_item_but->view_item) {
+          is_push = UI_view_item_is_active(view_item_but->view_item);
         }
         break;
       }
@@ -2387,9 +2363,9 @@ void ui_but_v3_set(uiBut *but, const float vec[3])
   }
   else if (but->pointype == UI_BUT_POIN_CHAR) {
     char *cp = (char *)but->poin;
-    cp[0] = (char)(0.5f + vec[0] * 255.0f);
-    cp[1] = (char)(0.5f + vec[1] * 255.0f);
-    cp[2] = (char)(0.5f + vec[2] * 255.0f);
+    cp[0] = (char)lround(vec[0] * 255.0f);
+    cp[1] = (char)lround(vec[1] * 255.0f);
+    cp[2] = (char)lround(vec[2] * 255.0f);
   }
   else if (but->pointype == UI_BUT_POIN_FLOAT) {
     float *fp = (float *)but->poin;
@@ -4011,17 +3987,13 @@ static void ui_but_alloc_info(const eButType type,
       alloc_size = sizeof(uiButCurveProfile);
       alloc_str = "uiButCurveProfile";
       break;
-    case UI_BTYPE_TREEROW:
-      alloc_size = sizeof(uiButTreeRow);
-      alloc_str = "uiButTreeRow";
-      break;
     case UI_BTYPE_HOTKEY_EVENT:
       alloc_size = sizeof(uiButHotkeyEvent);
       alloc_str = "uiButHotkeyEvent";
       break;
-    case UI_BTYPE_GRID_TILE:
-      alloc_size = sizeof(uiButGridTile);
-      alloc_str = "uiButGridTile";
+    case UI_BTYPE_VIEW_ITEM:
+      alloc_size = sizeof(uiButViewItem);
+      alloc_str = "uiButViewItem";
       break;
     default:
       alloc_size = sizeof(uiBut);
@@ -4214,7 +4186,6 @@ static uiBut *ui_def_but(uiBlock *block,
                 UI_BTYPE_BLOCK,
                 UI_BTYPE_BUT_MENU,
                 UI_BTYPE_SEARCH_MENU,
-                UI_BTYPE_TREEROW,
                 UI_BTYPE_POPOVER)) {
     but->drawflag |= (UI_BUT_TEXT_LEFT | UI_BUT_ICON_LEFT);
   }
@@ -6350,6 +6321,13 @@ void UI_but_func_search_set_tooltip(uiBut *but, uiButSearchTooltipFn tooltip_fn)
   but_search->item_tooltip_fn = tooltip_fn;
 }
 
+void UI_but_func_search_set_listen(uiBut *but, uiButSearchListenFn listen_fn)
+{
+  uiButSearch *but_search = (uiButSearch *)but;
+  BLI_assert(but->type == UI_BTYPE_SEARCH_MENU);
+  but_search->listen_fn = listen_fn;
+}
+
 void UI_but_func_search_set_results_are_suggestions(uiBut *but, const bool value)
 {
   uiButSearch *but_search = (uiButSearch *)but;
@@ -6469,15 +6447,6 @@ uiBut *uiDefSearchButO_ptr(uiBlock *block,
   return but;
 }
 
-void UI_but_treerow_indentation_set(uiBut *but, int indentation)
-{
-  uiButTreeRow *but_row = (uiButTreeRow *)but;
-  BLI_assert(but->type == UI_BTYPE_TREEROW);
-
-  but_row->indentation = indentation;
-  BLI_assert(indentation >= 0);
-}
-
 void UI_but_hint_drawstr_set(uiBut *but, const char *string)
 {
   ui_but_add_shortcut(but, string, false);
@@ -6623,7 +6592,7 @@ void UI_but_string_info_get(bContext *C, uiBut *but, ...)
           MenuType *mt = UI_but_menutype_get(but);
           if (mt) {
             if (type == BUT_GET_RNA_LABEL) {
-              tmp = BLI_strdup(mt->label);
+              tmp = BLI_strdup(CTX_TIP_(mt->translation_context, mt->label));
             }
             else {
               /* Not all menus are from Python. */
@@ -6653,7 +6622,7 @@ void UI_but_string_info_get(bContext *C, uiBut *but, ...)
           PanelType *pt = UI_but_paneltype_get(but);
           if (pt) {
             if (type == BUT_GET_RNA_LABEL) {
-              tmp = BLI_strdup(pt->label);
+              tmp = BLI_strdup(CTX_TIP_(pt->translation_context, pt->label));
             }
             else {
               /* Not all panels are from Python. */
@@ -6792,10 +6761,11 @@ void UI_but_extra_icon_string_info_get(struct bContext *C, uiButExtraOpIcon *ext
         if (ui_but_extra_icon_event_operator_string(C, extra_icon, buf, sizeof(buf))) {
           tmp = BLI_strdup(buf);
         }
+        break;
       }
+      default:
         /* Other types not supported. The caller should expect that outcome, no need to message or
          * assert here. */
-      default:
         break;
     }
 
diff --git a/source/blender/editors/interface/interface_anim.c b/source/blender/editors/interface/interface_anim.cc
index 0e69b4bb358..4da6cefd8de 100644
--- a/source/blender/editors/interface/interface_anim.c
+++ b/source/blender/editors/interface/interface_anim.cc
@@ -4,9 +4,9 @@
  * \ingroup edinterface
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
 
 #include "MEM_guardedalloc.h"
 
@@ -35,6 +35,7 @@
 #include "UI_interface.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -48,8 +49,14 @@ static FCurve *ui_but_get_fcurve(
    * but works well enough in typical cases */
   const int rnaindex = (but->rnaindex == -1) ? 0 : but->rnaindex;
 
-  return BKE_fcurve_find_by_rna_context_ui(
-      but->block->evil_C, &but->rnapoin, but->rnaprop, rnaindex, adt, action, r_driven, r_special);
+  return BKE_fcurve_find_by_rna_context_ui(static_cast<bContext *>(but->block->evil_C),
+                                           &but->rnapoin,
+                                           but->rnaprop,
+                                           rnaindex,
+                                           adt,
+                                           action,
+                                           r_driven,
+                                           r_special);
 }
 
 void ui_but_anim_flag(uiBut *but, const AnimationEvalContext *anim_eval_context)
@@ -92,7 +99,7 @@ void ui_but_anim_flag(uiBut *but, const AnimationEvalContext *anim_eval_context)
       }
 
       /* XXX: this feature is totally broken and useless with NLA */
-      if (adt == NULL || adt->nla_tracks.first == NULL) {
+      if (adt == nullptr || adt->nla_tracks.first == nullptr) {
         const AnimationEvalContext remapped_context = BKE_animsys_eval_context_construct_at(
             anim_eval_context, cfra);
         if (fcurve_is_changed(but->rnapoin, but->rnaprop, fcu, &remapped_context)) {
@@ -108,13 +115,13 @@ void ui_but_anim_flag(uiBut *but, const AnimationEvalContext *anim_eval_context)
 
 static uiBut *ui_but_anim_decorate_find_attached_button(uiButDecorator *but_decorate)
 {
-  uiBut *but_iter = NULL;
+  uiBut *but_iter = nullptr;
 
   BLI_assert(UI_but_is_decorator(&but_decorate->but));
   BLI_assert(but_decorate->rnapoin.data && but_decorate->rnaprop);
 
   LISTBASE_CIRCULAR_BACKWARD_BEGIN (
-      &but_decorate->but.block->buttons, but_iter, but_decorate->but.prev) {
+      uiBut *, &but_decorate->but.block->buttons, but_iter, but_decorate->but.prev) {
     if (but_iter != (uiBut *)but_decorate &&
         ui_but_rna_equals_ex(
             but_iter, &but_decorate->rnapoin, but_decorate->rnaprop, but_decorate->rnaindex)) {
@@ -122,9 +129,9 @@ static uiBut *ui_but_anim_decorate_find_attached_button(uiButDecorator *but_deco
     }
   }
   LISTBASE_CIRCULAR_BACKWARD_END(
-      &but_decorate->but.block->buttons, but_iter, but_decorate->but.prev);
+      uiBut *, &but_decorate->but.block->buttons, but_iter, but_decorate->but.prev);
 
-  return NULL;
+  return nullptr;
 }
 
 void ui_but_anim_decorate_update_from_flag(uiButDecorator *decorator_but)
@@ -172,7 +179,7 @@ bool ui_but_anim_expression_get(uiBut *but, char *str, size_t maxlen)
   ChannelDriver *driver;
   bool driven, special;
 
-  fcu = ui_but_get_fcurve(but, NULL, NULL, &driven, &special);
+  fcu = ui_but_get_fcurve(but, nullptr, nullptr, &driven, &special);
 
   if (fcu && driven) {
     driver = fcu->driver;
@@ -194,13 +201,13 @@ bool ui_but_anim_expression_set(uiBut *but, const char *str)
   ChannelDriver *driver;
   bool driven, special;
 
-  fcu = ui_but_get_fcurve(but, NULL, NULL, &driven, &special);
+  fcu = ui_but_get_fcurve(but, nullptr, nullptr, &driven, &special);
 
   if (fcu && driven) {
     driver = fcu->driver;
 
     if (driver && (driver->type == DRIVER_TYPE_PYTHON)) {
-      bContext *C = but->block->evil_C;
+      bContext *C = static_cast<bContext *>(but->block->evil_C);
 
       BLI_strncpy_utf8(driver->expression, str, sizeof(driver->expression));
 
@@ -212,7 +219,7 @@ bool ui_but_anim_expression_set(uiBut *but, const char *str)
       fcu->flag &= ~FCURVE_DISABLED;
 
       /* this notifier should update the Graph Editor and trigger depsgraph refresh? */
-      WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME, NULL);
+      WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME, nullptr);
 
       DEG_relations_tag_update(CTX_data_main(C));
 
@@ -225,14 +232,14 @@ bool ui_but_anim_expression_set(uiBut *but, const char *str)
 
 bool ui_but_anim_expression_create(uiBut *but, const char *str)
 {
-  bContext *C = but->block->evil_C;
+  bContext *C = static_cast<bContext *>(but->block->evil_C);
   ID *id;
   FCurve *fcu;
   char *path;
   bool ok = false;
 
   /* button must have RNA-pointer to a numeric-capable property */
-  if (ELEM(NULL, but->rnapoin.data, but->rnaprop)) {
+  if (ELEM(nullptr, but->rnapoin.data, but->rnaprop)) {
     if (G.debug & G_DEBUG) {
       printf("ERROR: create expression failed - button has no RNA info attached\n");
     }
@@ -252,7 +259,7 @@ bool ui_but_anim_expression_create(uiBut *but, const char *str)
   /* FIXME: until materials can be handled by depsgraph,
    * don't allow drivers to be created for them */
   id = but->rnapoin.owner_id;
-  if ((id == NULL) || (GS(id->name) == ID_MA) || (GS(id->name) == ID_TE)) {
+  if ((id == nullptr) || (GS(id->name) == ID_MA) || (GS(id->name) == ID_TE)) {
     if (G.debug & G_DEBUG) {
       printf("ERROR: create expression failed - invalid data-block for adding drivers (%p)\n", id);
     }
@@ -261,7 +268,7 @@ bool ui_but_anim_expression_create(uiBut *but, const char *str)
 
   /* get path */
   path = RNA_path_from_ID_to_property(&but->rnapoin, but->rnaprop);
-  if (path == NULL) {
+  if (path == nullptr) {
     return false;
   }
 
@@ -281,7 +288,7 @@ bool ui_but_anim_expression_create(uiBut *but, const char *str)
       /* updates */
       BKE_driver_invalidate_expression(driver, true, false);
       DEG_relations_tag_update(CTX_data_main(C));
-      WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME, NULL);
+      WM_event_add_notifier(C, NC_ANIMATION | ND_KEYFRAME, nullptr);
       ok = true;
     }
   }
@@ -299,26 +306,26 @@ void ui_but_anim_autokey(bContext *C, uiBut *but, Scene *scene, float cfra)
 void ui_but_anim_copy_driver(bContext *C)
 {
   /* this operator calls UI_context_active_but_prop_get */
-  WM_operator_name_call(C, "ANIM_OT_copy_driver_button", WM_OP_INVOKE_DEFAULT, NULL, NULL);
+  WM_operator_name_call(C, "ANIM_OT_copy_driver_button", WM_OP_INVOKE_DEFAULT, nullptr, nullptr);
 }
 
 void ui_but_anim_paste_driver(bContext *C)
 {
   /* this operator calls UI_context_active_but_prop_get */
-  WM_operator_name_call(C, "ANIM_OT_paste_driver_button", WM_OP_INVOKE_DEFAULT, NULL, NULL);
+  WM_operator_name_call(C, "ANIM_OT_paste_driver_button", WM_OP_INVOKE_DEFAULT, nullptr, nullptr);
 }
 
 void ui_but_anim_decorate_cb(bContext *C, void *arg_but, void *UNUSED(arg_dummy))
 {
   wmWindowManager *wm = CTX_wm_manager(C);
-  uiButDecorator *but_decorate = arg_but;
+  uiButDecorator *but_decorate = static_cast<uiButDecorator *>(arg_but);
   uiBut *but_anim = ui_but_anim_decorate_find_attached_button(but_decorate);
 
   if (!but_anim) {
     return;
   }
 
-  /* FIXME(campbell), swapping active pointer is weak. */
+  /* FIXME(@campbellbarton): swapping active pointer is weak. */
   SWAP(struct uiHandleButtonData *, but_anim->active, but_decorate->but.active);
   wm->op_undo_depth++;
 
@@ -331,7 +338,7 @@ void ui_but_anim_decorate_cb(bContext *C, void *arg_but, void *UNUSED(arg_dummy)
     wmOperatorType *ot = WM_operatortype_find("ANIM_OT_keyframe_delete_button", false);
     WM_operator_properties_create_ptr(&props_ptr, ot);
     RNA_boolean_set(&props_ptr, "all", but_anim->rnaindex == -1);
-    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &props_ptr, NULL);
+    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &props_ptr, nullptr);
     WM_operator_properties_free(&props_ptr);
   }
   else {
@@ -339,7 +346,7 @@ void ui_but_anim_decorate_cb(bContext *C, void *arg_but, void *UNUSED(arg_dummy)
     wmOperatorType *ot = WM_operatortype_find("ANIM_OT_keyframe_insert_button", false);
     WM_operator_properties_create_ptr(&props_ptr, ot);
     RNA_boolean_set(&props_ptr, "all", but_anim->rnaindex == -1);
-    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &props_ptr, NULL);
+    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &props_ptr, nullptr);
     WM_operator_properties_free(&props_ptr);
   }
 
diff --git a/source/blender/editors/interface/interface_context_menu.c b/source/blender/editors/interface/interface_context_menu.c
index e58298cdaee..7ed9488950e 100644
--- a/source/blender/editors/interface/interface_context_menu.c
+++ b/source/blender/editors/interface/interface_context_menu.c
@@ -927,11 +927,11 @@ bool ui_popup_context_menu_for_button(bContext *C, uiBut *but, const wmEvent *ev
 
   {
     const ARegion *region = CTX_wm_menu(C) ? CTX_wm_menu(C) : CTX_wm_region(C);
-    uiButTreeRow *treerow_but = (uiButTreeRow *)ui_tree_row_find_mouse_over(region, event->xy);
-    if (treerow_but) {
-      BLI_assert(treerow_but->but.type == UI_BTYPE_TREEROW);
-      UI_tree_view_item_context_menu_build(
-          C, treerow_but->tree_item, uiLayoutColumn(layout, false));
+    uiButViewItem *view_item_but = (uiButViewItem *)ui_view_item_find_mouse_over(region,
+                                                                                 event->xy);
+    if (view_item_but) {
+      BLI_assert(view_item_but->but.type == UI_BTYPE_VIEW_ITEM);
+      UI_view_item_context_menu_build(C, view_item_but->view_item, uiLayoutColumn(layout, false));
       uiItemS(layout);
     }
   }
@@ -952,6 +952,12 @@ bool ui_popup_context_menu_for_button(bContext *C, uiBut *but, const wmEvent *ev
     uiItemS(layout);
   }
 
+  MenuType *mt_idtemplate_liboverride = WM_menutype_find("UI_MT_idtemplate_liboverride", true);
+  if (mt_idtemplate_liboverride && mt_idtemplate_liboverride->poll(C, mt_idtemplate_liboverride)) {
+    uiItemM_ptr(layout, mt_idtemplate_liboverride, IFACE_("Library Override"), ICON_NONE);
+    uiItemS(layout);
+  }
+
   /* Pointer properties and string properties with
    * prop_search support jumping to target object/bone. */
   if (but->rnapoin.data && but->rnaprop) {
@@ -1224,7 +1230,7 @@ bool ui_popup_context_menu_for_button(bContext *C, uiBut *but, const wmEvent *ev
     }
   }
 
-  MenuType *mt = WM_menutype_find("WM_MT_button_context", true);
+  MenuType *mt = WM_menutype_find("UI_MT_button_context_menu", true);
   if (mt) {
     UI_menutype_draw(C, mt, uiLayoutColumn(layout, false));
   }
diff --git a/source/blender/editors/interface/interface_drag.cc b/source/blender/editors/interface/interface_drag.cc
index 4c68870b2c7..4bf2dac4151 100644
--- a/source/blender/editors/interface/interface_drag.cc
+++ b/source/blender/editors/interface/interface_drag.cc
@@ -37,7 +37,7 @@ void UI_but_drag_set_asset(uiBut *but,
 {
   wmDragAsset *asset_drag = WM_drag_create_asset_data(asset, metadata, path, import_type);
 
-  /* FIXME: This is temporary evil solution to get scene/viewlayer/etc in the copy callback of the
+  /* FIXME: This is temporary evil solution to get scene/view-layer/etc in the copy callback of the
    * #wmDropBox.
    * TODO: Handle link/append in operator called at the end of the drop process, and NOT in its
    * copy callback.
@@ -122,7 +122,7 @@ bool ui_but_drag_is_draggable(const uiBut *but)
 
 void ui_but_drag_start(bContext *C, uiBut *but)
 {
-  wmDrag *drag = WM_event_start_drag(C,
+  wmDrag *drag = WM_drag_data_create(C,
                                      but->icon,
                                      but->dragtype,
                                      but->dragpoin,
@@ -130,15 +130,17 @@ void ui_but_drag_start(bContext *C, uiBut *but)
                                      (but->dragflag & UI_BUT_DRAGPOIN_FREE) ? WM_DRAG_FREE_DATA :
                                                                               WM_DRAG_NOP);
   /* wmDrag has ownership over dragpoin now, stop messing with it. */
-  but->dragpoin = NULL;
+  but->dragpoin = nullptr;
 
   if (but->imb) {
     WM_event_drag_image(drag, but->imb, but->imb_scale);
   }
 
+  WM_event_start_prepared_drag(C, drag);
+
   /* Special feature for assets: We add another drag item that supports multiple assets. It
    * gets the assets from context. */
   if (ELEM(but->dragtype, WM_DRAG_ASSET, WM_DRAG_ID)) {
-    WM_event_start_drag(C, ICON_NONE, WM_DRAG_ASSET_LIST, NULL, 0, WM_DRAG_NOP);
+    WM_event_start_drag(C, ICON_NONE, WM_DRAG_ASSET_LIST, nullptr, 0, WM_DRAG_NOP);
   }
 }
diff --git a/source/blender/editors/interface/interface_draw.c b/source/blender/editors/interface/interface_draw.c
index d201820fbb6..f1a324c411a 100644
--- a/source/blender/editors/interface/interface_draw.c
+++ b/source/blender/editors/interface/interface_draw.c
@@ -171,7 +171,7 @@ void UI_draw_text_underline(int pos_x, int pos_y, int len, int height, const flo
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4fv(color);
 
   immRecti(pos, pos_x, pos_y - ofs_y, pos_x + len, pos_y - ofs_y + (height * U.pixelsize));
@@ -205,7 +205,7 @@ void ui_draw_but_TAB_outline(const rcti *rect,
     mul_v2_fl(vec[a], rad);
   }
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
   immBeginAtMost(GPU_PRIM_LINE_STRIP, 25);
 
   immAttr3ubv(col, highlight);
@@ -309,7 +309,7 @@ void ui_draw_but_IMAGE(ARegion *UNUSED(region),
     rgba_uchar_to_float(col, but->col);
   }
 
-  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
   immDrawPixelsTexTiled(&state,
                         (float)rect->xmin,
                         (float)rect->ymin,
@@ -490,7 +490,7 @@ void ui_draw_but_HISTOGRAM(ARegion *UNUSED(region),
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4f(1.0f, 1.0f, 1.0f, 0.08f);
   /* draw grid lines here */
@@ -559,7 +559,7 @@ static void waveform_draw_one(float *waveform, int waveform_num, const float col
 
   /* TODO: store the #GPUBatch inside the scope. */
   GPUBatch *batch = GPU_batch_create_ex(GPU_PRIM_POINTS, vbo, NULL, GPU_BATCH_OWNS_VBO);
-  GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_UNIFORM_COLOR);
+  GPU_batch_program_set_builtin(batch, GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_batch_uniform_4f(batch, "color", col[0], col[1], col[2], 1.0f);
   GPU_batch_draw(batch);
 
@@ -653,7 +653,7 @@ void ui_draw_but_WAVEFORM(ARegion *UNUSED(region),
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4f(1.0f, 1.0f, 1.0f, 0.08f);
 
@@ -977,7 +977,7 @@ void ui_draw_but_VECTORSCOPE(ARegion *UNUSED(region),
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4f(1.0f, 1.0f, 1.0f, 0.08f);
   /* draw grid elements */
@@ -1128,7 +1128,7 @@ static void ui_draw_colorband_handle(uint shdr_pos,
   if (active || half_width < min_width) {
     immUnbindProgram();
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -1147,7 +1147,7 @@ static void ui_draw_colorband_handle(uint shdr_pos,
 
     immUnbindProgram();
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* hide handles when zoomed out too far */
     if (half_width < min_width) {
@@ -1242,7 +1242,7 @@ void ui_draw_but_COLORBAND(uiBut *but, const uiWidgetColors *UNUSED(wcol), const
   format = immVertexFormat();
   pos_id = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   col_id = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   /* layer: color ramp */
   GPU_blend(GPU_BLEND_ALPHA);
@@ -1298,7 +1298,7 @@ void ui_draw_but_COLORBAND(uiBut *but, const uiWidgetColors *UNUSED(wcol), const
   /* New format */
   format = immVertexFormat();
   pos_id = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* layer: box outline */
   immUniformColor4f(0.0f, 0.0f, 0.0f, 1.0f);
@@ -1400,7 +1400,7 @@ void ui_draw_but_UNITVEC(uiBut *but,
   /* AA circle */
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3ubv(wcol->inner);
 
   GPU_blend(GPU_BLEND_ALPHA);
@@ -1534,7 +1534,7 @@ void ui_draw_but_CURVE(ARegion *region, uiBut *but, const uiWidgetColors *wcol,
 
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* backdrop */
   float color_backdrop[4] = {0, 0, 0, 1};
@@ -1657,7 +1657,7 @@ void ui_draw_but_CURVE(ARegion *region, uiBut *but, const uiWidgetColors *wcol,
     line_range.ymax = rect->ymin + zoomy * (cmp[CM_TABLE].y - offsy - cuma->ext_out[1]);
   }
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_blend(GPU_BLEND_ALPHA);
 
   /* Curve filled. */
@@ -1698,7 +1698,7 @@ void ui_draw_but_CURVE(ARegion *region, uiBut *but, const uiWidgetColors *wcol,
   format = immVertexFormat();
   pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
 
   /* Calculate vertex colors based on text theme. */
   float color_vert[4], color_vert_select[4];
@@ -1730,7 +1730,7 @@ void ui_draw_but_CURVE(ARegion *region, uiBut *but, const uiWidgetColors *wcol,
   /* outline */
   format = immVertexFormat();
   pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3ubv(wcol->outline);
   imm_draw_box_wire_2d(pos, rect->xmin, rect->ymin, rect->xmax, rect->ymax);
@@ -1790,7 +1790,7 @@ void ui_draw_but_CURVEPROFILE(ARegion *region,
 
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw the backdrop. */
   float color_backdrop[4] = {0, 0, 0, 1};
@@ -1948,7 +1948,7 @@ void ui_draw_but_CURVEPROFILE(ARegion *region,
   format = immVertexFormat();
   pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
 
   /* Calculate vertex colors based on text theme. */
   float color_vert[4], color_vert_select[4], color_sample[4];
@@ -2025,7 +2025,7 @@ void ui_draw_but_CURVEPROFILE(ARegion *region,
   /* Outline */
   format = immVertexFormat();
   pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3ubv((const uchar *)wcol->outline);
   imm_draw_box_wire_2d(pos, rect->xmin, rect->ymin, rect->xmax, rect->ymax);
@@ -2132,7 +2132,7 @@ void ui_draw_but_TRACKPREVIEW(ARegion *UNUSED(region),
             color);
       }
 
-      IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+      IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
       immDrawPixelsTexTiled(&state,
                             rect.xmin,
                             rect.ymin + 1,
@@ -2152,7 +2152,7 @@ void ui_draw_but_TRACKPREVIEW(ARegion *UNUSED(region),
       GPUVertFormat *format = immVertexFormat();
       const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
       const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
 
       UI_GetThemeColor4fv(TH_SEL_MARKER, col_sel);
       UI_GetThemeColor4fv(TH_MARKER_OUTLINE, col_outline);
@@ -2288,7 +2288,7 @@ void UI_draw_box_shadow(const rctf *rect, uchar alpha)
   uint color = GPU_vertformat_attr_add(
       format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRIS, 54);
 
@@ -2307,9 +2307,6 @@ void UI_draw_box_shadow(const rctf *rect, uchar alpha)
 void ui_draw_dropshadow(
     const rctf *rct, float radius, float aspect, float alpha, int UNUSED(select))
 {
-  const float max_radius = (BLI_rctf_size_y(rct) - 10.0f) * 0.5f;
-  const float rad = min_ff(radius, max_radius);
-
   /* This undoes the scale of the view for higher zoom factors to clamp the shadow size. */
   const float clamped_aspect = smoothminf(aspect, 1.0f, 0.5f);
 
@@ -2317,6 +2314,9 @@ void ui_draw_dropshadow(
   const float shadow_offset = 0.5f * U.widget_unit * clamped_aspect;
   const float shadow_alpha = 0.5f * alpha;
 
+  const float max_radius = (BLI_rctf_size_y(rct) - shadow_offset) * 0.5f;
+  const float rad = min_ff(radius, max_radius);
+
   GPU_blend(GPU_BLEND_ALPHA);
 
   uiWidgetBaseParameters widget_params = {
diff --git a/source/blender/editors/interface/interface_dropboxes.cc b/source/blender/editors/interface/interface_dropboxes.cc
index 9d3c1372b15..b72d8d2c238 100644
--- a/source/blender/editors/interface/interface_dropboxes.cc
+++ b/source/blender/editors/interface/interface_dropboxes.cc
@@ -22,15 +22,14 @@
 #include "UI_interface.h"
 
 /* -------------------------------------------------------------------- */
-/** \name Tree View Drag/Drop Callbacks
+/** \name View Drag/Drop Callbacks
  * \{ */
 
-static bool ui_tree_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *event)
+static bool ui_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *event)
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region,
-                                                                                  event->xy);
-  if (!hovered_tree_item) {
+  const uiViewItemHandle *hovered_item = UI_region_views_find_item_at(region, event->xy);
+  if (!hovered_item) {
     return false;
   }
 
@@ -39,21 +38,21 @@ static bool ui_tree_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *eve
   }
 
   drag->drop_state.free_disabled_info = false;
-  return UI_tree_view_item_can_drop(hovered_tree_item, drag, &drag->drop_state.disabled_info);
+  return UI_view_item_can_drop(hovered_item, drag, &drag->drop_state.disabled_info);
 }
 
-static char *ui_tree_view_drop_tooltip(bContext *C,
-                                       wmDrag *drag,
-                                       const int xy[2],
-                                       wmDropBox *UNUSED(drop))
+static char *ui_view_drop_tooltip(bContext *C,
+                                  wmDrag *drag,
+                                  const int xy[2],
+                                  wmDropBox *UNUSED(drop))
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region, xy);
-  if (!hovered_tree_item) {
+  const uiViewItemHandle *hovered_item = UI_region_views_find_item_at(region, xy);
+  if (!hovered_item) {
     return nullptr;
   }
 
-  return UI_tree_view_item_drop_tooltip(hovered_tree_item, drag);
+  return UI_view_item_drop_tooltip(hovered_item, drag);
 }
 
 /** \} */
@@ -140,12 +139,7 @@ void ED_dropboxes_ui()
 {
   ListBase *lb = WM_dropboxmap_find("User Interface", SPACE_EMPTY, 0);
 
-  WM_dropbox_add(lb,
-                 "UI_OT_tree_view_drop",
-                 ui_tree_view_drop_poll,
-                 nullptr,
-                 nullptr,
-                 ui_tree_view_drop_tooltip);
+  WM_dropbox_add(lb, "UI_OT_view_drop", ui_view_drop_poll, nullptr, nullptr, ui_view_drop_tooltip);
   WM_dropbox_add(lb,
                  "UI_OT_drop_name",
                  ui_drop_name_poll,
diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index 7c00c4f1875..ea1770db6f5 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -959,7 +959,7 @@ static void ui_apply_but_undo(uiBut *but)
     str = "";
   }
 
-  /* delayed, after all other funcs run, popups are closed, etc */
+  /* Delayed, after all other functions run, popups are closed, etc. */
   uiAfterFunc *after = ui_afterfunc_new();
   BLI_strncpy(after->undostr, str, min_zz(str_len_clip + 1, sizeof(after->undostr)));
 }
@@ -991,7 +991,7 @@ static void ui_apply_but_autokey(bContext *C, uiBut *but)
 
 static void ui_apply_but_funcs_after(bContext *C)
 {
-  /* copy to avoid recursive calls */
+  /* Copy to avoid recursive calls. */
   ListBase funcs = UIAfterFuncs;
   BLI_listbase_clear(&UIAfterFuncs);
 
@@ -1151,7 +1151,10 @@ static void ui_apply_but_ROW(bContext *C, uiBlock *block, uiBut *but, uiHandleBu
   data->applied = true;
 }
 
-static void ui_apply_but_TREEROW(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
+static void ui_apply_but_VIEW_ITEM(bContext *C,
+                                   uiBlock *block,
+                                   uiBut *but,
+                                   uiHandleButtonData *data)
 {
   if (data->apply_through_extra_icon) {
     /* Don't apply this, it would cause unintended tree-row toggling when clicking on extra icons.
@@ -2128,10 +2131,10 @@ static bool ui_but_drag_init(bContext *C,
         return false;
       }
     }
-    else if (but->type == UI_BTYPE_TREEROW) {
-      uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-      if (tree_row_but->tree_item) {
-        UI_tree_view_item_drag_start(C, tree_row_but->tree_item);
+    else if (but->type == UI_BTYPE_VIEW_ITEM) {
+      const uiButViewItem *view_item_but = (uiButViewItem *)but;
+      if (view_item_but->view_item) {
+        UI_view_item_drag_start(C, view_item_but->view_item);
       }
     }
     else {
@@ -2289,11 +2292,8 @@ static void ui_apply_but(
     case UI_BTYPE_ROW:
       ui_apply_but_ROW(C, block, but, data);
       break;
-    case UI_BTYPE_GRID_TILE:
-      ui_apply_but_ROW(C, block, but, data);
-      break;
-    case UI_BTYPE_TREEROW:
-      ui_apply_but_TREEROW(C, block, but, data);
+    case UI_BTYPE_VIEW_ITEM:
+      ui_apply_but_VIEW_ITEM(C, block, but, data);
       break;
     case UI_BTYPE_LISTROW:
       ui_apply_but_LISTROW(C, block, but, data);
@@ -3172,19 +3172,11 @@ static bool ui_textedit_insert_buf(uiBut *but,
   return changed;
 }
 
-static bool ui_textedit_insert_ascii(uiBut *but, uiHandleButtonData *data, char ascii)
+static bool ui_textedit_insert_ascii(uiBut *but, uiHandleButtonData *data, const char ascii)
 {
+  BLI_assert(isascii(ascii));
   const char buf[2] = {ascii, '\0'};
-
-  if (UI_but_is_utf8(but) && (BLI_str_utf8_size(buf) == -1)) {
-    printf(
-        "%s: entering invalid ascii char into an ascii key (%d)\n", __func__, (int)(uchar)ascii);
-
-    return false;
-  }
-
-  /* in some cases we want to allow invalid utf8 chars */
-  return ui_textedit_insert_buf(but, data, buf, 1);
+  return ui_textedit_insert_buf(but, data, buf, sizeof(buf) - 1);
 }
 
 static void ui_textedit_move(uiBut *but,
@@ -3897,30 +3889,27 @@ static void ui_do_but_textedit(
       }
     }
 
-    if ((event->ascii || event->utf8_buf[0]) && (retval == WM_UI_HANDLER_CONTINUE)
+    if ((event->utf8_buf[0]) && (retval == WM_UI_HANDLER_CONTINUE)
 #ifdef WITH_INPUT_IME
         && !is_ime_composing && !WM_event_is_ime_switch(event)
 #endif
     ) {
-      char ascii = event->ascii;
+      char utf8_buf_override[2] = {'\0', '\0'};
       const char *utf8_buf = event->utf8_buf;
 
       /* Exception that's useful for number buttons, some keyboard
        * numpads have a comma instead of a period. */
       if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER)) { /* Could use `data->min`. */
-        if (event->type == EVT_PADPERIOD && ascii == ',') {
-          ascii = '.';
-          utf8_buf = NULL; /* force ascii fallback */
+        if ((event->type == EVT_PADPERIOD) && (utf8_buf[0] == ',')) {
+          utf8_buf_override[0] = '.';
+          utf8_buf = utf8_buf_override;
         }
       }
 
-      if (utf8_buf && utf8_buf[0]) {
+      if (utf8_buf[0]) {
         const int utf8_buf_len = BLI_str_utf8_size(utf8_buf);
         BLI_assert(utf8_buf_len != -1);
-        changed = ui_textedit_insert_buf(but, data, event->utf8_buf, utf8_buf_len);
-      }
-      else {
-        changed = ui_textedit_insert_ascii(but, data, ascii);
+        changed = ui_textedit_insert_buf(but, data, utf8_buf, utf8_buf_len);
       }
 
       retval = WM_UI_HANDLER_BREAK;
@@ -3952,6 +3941,9 @@ static void ui_do_but_textedit(
   else if (event->type == WM_IME_COMPOSITE_END) {
     changed = true;
   }
+#else
+  /* Prevent the function from being unused. */
+  (void)ui_textedit_insert_ascii;
 #endif
 
   if (changed) {
@@ -4352,15 +4344,18 @@ static uiButExtraOpIcon *ui_but_extra_operator_icon_mouse_over_get(uiBut *but,
                                                                    ARegion *region,
                                                                    const wmEvent *event)
 {
-  float xmax = but->rect.xmax;
-  const float icon_size = 0.8f * BLI_rctf_size_y(&but->rect); /* ICON_SIZE_FROM_BUTRECT */
-  int x = event->xy[0], y = event->xy[1];
+  if (BLI_listbase_is_empty(&but->extra_op_icons)) {
+    return NULL;
+  }
 
+  int x = event->xy[0], y = event->xy[1];
   ui_window_to_block(region, but->block, &x, &y);
   if (!BLI_rctf_isect_pt(&but->rect, x, y)) {
     return NULL;
   }
 
+  const float icon_size = 0.8f * BLI_rctf_size_y(&but->rect); /* ICON_SIZE_FROM_BUTRECT */
+  float xmax = but->rect.xmax;
   /* Same as in 'widget_draw_extra_icons', icon padding from the right edge. */
   xmax -= 0.2 * icon_size;
 
@@ -4517,7 +4512,7 @@ static int ui_do_but_HOTKEYEVT(bContext *C,
     }
   }
   else if (data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
-    if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+    if (ISMOUSE_MOTION(event->type)) {
       return WM_UI_HANDLER_CONTINUE;
     }
     if (event->type == EVT_UNKNOWNKEY) {
@@ -4583,7 +4578,7 @@ static int ui_do_but_KEYEVT(bContext *C,
     }
   }
   else if (data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
-    if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+    if (ISMOUSE_MOTION(event->type)) {
       return WM_UI_HANDLER_CONTINUE;
     }
 
@@ -4772,53 +4767,13 @@ static int ui_do_but_TOG(bContext *C, uiBut *but, uiHandleButtonData *data, cons
   return WM_UI_HANDLER_CONTINUE;
 }
 
-static int ui_do_but_TREEROW(bContext *C,
-                             uiBut *but,
-                             uiHandleButtonData *data,
-                             const wmEvent *event)
-{
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-  BLI_assert(tree_row_but->but.type == UI_BTYPE_TREEROW);
-
-  if (data->state == BUTTON_STATE_HIGHLIGHT) {
-    if (event->type == LEFTMOUSE) {
-      switch (event->val) {
-        case KM_PRESS:
-          /* Extra icons have priority, don't mess with them. */
-          if (ui_but_extra_operator_icon_mouse_over_get(but, data->region, event)) {
-            return WM_UI_HANDLER_BREAK;
-          }
-          button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
-          data->dragstartx = event->xy[0];
-          data->dragstarty = event->xy[1];
-          return WM_UI_HANDLER_CONTINUE;
-
-        case KM_CLICK:
-          button_activate_state(C, but, BUTTON_STATE_EXIT);
-          return WM_UI_HANDLER_BREAK;
-
-        case KM_DBL_CLICK:
-          data->cancel = true;
-          UI_tree_view_item_begin_rename(tree_row_but->tree_item);
-          ED_region_tag_redraw(CTX_wm_region(C));
-          return WM_UI_HANDLER_BREAK;
-      }
-    }
-  }
-  else if (data->state == BUTTON_STATE_WAIT_DRAG) {
-    /* Let "default" button handling take care of the drag logic. */
-    return ui_do_but_EXIT(C, but, data, event);
-  }
-
-  return WM_UI_HANDLER_CONTINUE;
-}
-
-static int ui_do_but_GRIDTILE(bContext *C,
-                              uiBut *but,
-                              uiHandleButtonData *data,
-                              const wmEvent *event)
+static int ui_do_but_VIEW_ITEM(bContext *C,
+                               uiBut *but,
+                               uiHandleButtonData *data,
+                               const wmEvent *event)
 {
-  BLI_assert(but->type == UI_BTYPE_GRID_TILE);
+  uiButViewItem *view_item_but = (uiButViewItem *)but;
+  BLI_assert(view_item_but->but.type == UI_BTYPE_VIEW_ITEM);
 
   if (data->state == BUTTON_STATE_HIGHLIGHT) {
     if (event->type == LEFTMOUSE) {
@@ -4839,8 +4794,7 @@ static int ui_do_but_GRIDTILE(bContext *C,
 
         case KM_DBL_CLICK:
           data->cancel = true;
-          // uiButGridTile *grid_tile_but = (uiButGridTile *)but;
-          // UI_tree_view_item_begin_rename(grid_tile_but->tree_item);
+          UI_view_item_begin_rename(view_item_but->view_item);
           ED_region_tag_redraw(CTX_wm_region(C));
           return WM_UI_HANDLER_BREAK;
       }
@@ -7988,7 +7942,7 @@ static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *
        * to spawn the context menu should also activate the item. This makes it clear which item
        * will be operated on.
        * Apply the button immediately, so context menu polls get the right active item. */
-      if (ELEM(but->type, UI_BTYPE_TREEROW)) {
+      if (ELEM(but->type, UI_BTYPE_VIEW_ITEM)) {
         ui_apply_but(C, but->block, but, but->active, true);
       }
 
@@ -8053,11 +8007,8 @@ static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *
     case UI_BTYPE_ROW:
       retval = ui_do_but_TOG(C, but, data, event);
       break;
-    case UI_BTYPE_GRID_TILE:
-      retval = ui_do_but_GRIDTILE(C, but, data, event);
-      break;
-    case UI_BTYPE_TREEROW:
-      retval = ui_do_but_TREEROW(C, but, data, event);
+    case UI_BTYPE_VIEW_ITEM:
+      retval = ui_do_but_VIEW_ITEM(C, but, data, event);
       break;
     case UI_BTYPE_SCROLL:
       retval = ui_do_but_SCROLL(C, block, but, data, event);
@@ -8149,7 +8100,7 @@ static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *
 #ifdef USE_DRAG_MULTINUM
   data = but->active;
   if (data) {
-    if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE) ||
+    if (ISMOUSE_MOTION(event->type) ||
         /* if we started dragging, progress on any event */
         (data->multi_data.init == BUTTON_MULTI_INIT_SETUP)) {
       if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER) &&
@@ -8862,7 +8813,7 @@ void UI_context_active_but_prop_handle(bContext *C, const bool handle_undo)
 {
   uiBut *activebut = ui_context_rna_button_active(C);
   if (activebut) {
-    /* TODO(campbell): look into a better way to handle the button change
+    /* TODO(@campbellbarton): look into a better way to handle the button change
      * currently this is mainly so reset defaults works for the
      * operator redo panel. */
     uiBlock *block = activebut->block;
@@ -9487,7 +9438,7 @@ static int ui_list_activate_hovered_row(bContext *C,
     }
 
     /* Simulate click on listrow button itself (which may be overlapped by another button). Also
-     * calls the custom activate operator (ui_list->custom_activate_opname). */
+     * calls the custom activate operator (#uiListDyn::custom_activate_optype). */
     UI_but_execute(C, region, listrow);
 
     ((uiList *)ui_list)->dyn_data->custom_activate_optype = custom_activate_optype;
@@ -9558,13 +9509,13 @@ static void ui_list_activate_row_from_index(
   uiBut *new_active_row = ui_list_row_find_from_index(region, index, listbox);
   if (new_active_row) {
     /* Preferred way to update the active item, also calls the custom activate operator
-     * (#uiList.custom_activate_opname). */
+     * (#uiListDyn::custom_activate_optype). */
     UI_but_execute(C, region, new_active_row);
   }
   else {
     /* A bit ugly, set the active index in RNA directly. That's because a button that's
      * scrolled away in the list box isn't created at all.
-     * The custom activate operator (#uiList.custom_activate_opname) is not called in this case
+     * The custom activate operator (#uiListDyn::custom_activate_optype) is not called in this case
      * (which may need the row button context). */
     RNA_property_int_set(&listbox->rnapoin, listbox->rnaprop, index);
     RNA_property_update(C, &listbox->rnapoin, listbox->rnaprop);
@@ -9733,7 +9684,7 @@ static int ui_handle_view_items_hover(const wmEvent *event, const ARegion *regio
     }
 
     LISTBASE_FOREACH (uiBut *, but, &block->buttons) {
-      if (ui_but_is_view_item(but)) {
+      if (but->type == UI_BTYPE_VIEW_ITEM) {
         but->flag &= ~UI_ACTIVE;
         has_view_item = true;
       }
@@ -9760,7 +9711,7 @@ static int ui_handle_view_item_event(bContext *C,
                                      ARegion *region,
                                      uiBut *view_but)
 {
-  BLI_assert(ui_but_is_view_item(view_but));
+  BLI_assert(view_but->type == UI_BTYPE_VIEW_ITEM);
   if (event->type == LEFTMOUSE) {
     /* Will free active button if there already is one. */
     ui_handle_button_activate(C, region, view_but, BUTTON_ACTIVATE_OVER);
@@ -10148,8 +10099,7 @@ static int ui_handle_menu_button(bContext *C, const wmEvent *event, uiPopupBlock
       /* Pass, needed to click-exit outside of non-floating menus. */
       ui_region_auto_open_clear(but->active->region);
     }
-    else if ((!ELEM(event->type, MOUSEMOVE, WHEELUPMOUSE, WHEELDOWNMOUSE, MOUSEPAN)) &&
-             ISMOUSE(event->type)) {
+    else if (ISMOUSE_BUTTON(event->type)) {
       if (!ui_but_contains_point_px(but, but->active->region, event->xy)) {
         but = NULL;
       }
diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index c19e842aad8..ad2c08194aa 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -360,7 +360,7 @@ static void vicon_colorset_draw(int index, int x, int y, int w, int h, float UNU
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* XXX: Include alpha into this... */
   /* normal */
@@ -505,7 +505,7 @@ static void vicon_gplayer_color_draw(Icon *icon, int x, int y, int w, int h)
    */
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3fv(gpl->color);
   immRecti(pos, x, y, x + w - 1, y + h - 1);
@@ -1546,7 +1546,7 @@ static void icon_draw_rect(float x,
     shader = GPU_SHADER_2D_IMAGE_DESATURATE_COLOR;
   }
   else {
-    shader = GPU_SHADER_2D_IMAGE_COLOR;
+    shader = GPU_SHADER_3D_IMAGE_COLOR;
   }
   IMMDrawPixelsTexState state = immDrawPixelsTexSetup(shader);
 
@@ -1824,7 +1824,7 @@ static void icon_draw_size(float x,
   }
   else if (di->type == ICON_TYPE_GEOM) {
 #ifdef USE_UI_TOOLBAR_HACK
-    /* TODO(campbell): scale icons up for toolbar,
+    /* TODO(@campbellbarton): scale icons up for toolbar,
      * we need a way to detect larger buttons and do this automatic. */
     {
       float scale = (float)ICON_DEFAULT_HEIGHT_TOOLBAR / (float)ICON_DEFAULT_HEIGHT;
@@ -1839,7 +1839,7 @@ static void icon_draw_size(float x,
     const bool geom_inverted = di->data.geom.inverted;
 
     /* This could re-generate often if rendered at different sizes in the one interface.
-     * TODO(campbell): support caching multiple sizes. */
+     * TODO(@campbellbarton): support caching multiple sizes. */
     ImBuf *ibuf = di->data.geom.image_cache;
     if ((ibuf == NULL) || (ibuf->x != w) || (ibuf->y != h) || (invert != geom_inverted)) {
       if (ibuf) {
diff --git a/source/blender/editors/interface/interface_icons_event.c b/source/blender/editors/interface/interface_icons_event.c
index 6ad5fe805ab..e892a989191 100644
--- a/source/blender/editors/interface/interface_icons_event.c
+++ b/source/blender/editors/interface/interface_icons_event.c
@@ -60,10 +60,8 @@
 
 #include "interface_intern.h"
 
-static void icon_draw_rect_input_text(const rctf *rect,
-                                      const float color[4],
-                                      const char *str,
-                                      float font_size)
+static void icon_draw_rect_input_text(
+    const rctf *rect, const float color[4], const char *str, float font_size, float v_offset)
 {
   BLF_batch_draw_flush();
   const int font_id = BLF_default();
@@ -71,21 +69,9 @@ static void icon_draw_rect_input_text(const rctf *rect,
   BLF_size(font_id, font_size * U.pixelsize, U.dpi);
   float width, height;
   BLF_width_and_height(font_id, str, BLF_DRAW_STR_DUMMY_MAX, &width, &height);
-  const float x = rect->xmin + (((rect->xmax - rect->xmin) - width) / 2.0f);
-  const float y = rect->ymin + (((rect->ymax - rect->ymin) - height) / 2.0f);
-  BLF_position(font_id, x, y, 0.0f);
-  BLF_draw(font_id, str, BLF_DRAW_STR_DUMMY_MAX);
-  BLF_batch_draw_flush();
-}
-
-static void icon_draw_rect_input_symbol(const rctf *rect, const float color[4], const char *str)
-{
-  BLF_batch_draw_flush();
-  const int font_id = blf_mono_font;
-  BLF_color4fv(font_id, color);
-  BLF_size(font_id, 19.0f * U.pixelsize, U.dpi);
-  const float x = rect->xmin + (2.0f * U.pixelsize);
-  const float y = rect->ymin + (1.0f * U.pixelsize);
+  const float x = trunc(rect->xmin + (((rect->xmax - rect->xmin) - width) / 2.0f));
+  const float y = rect->ymin + (((rect->ymax - rect->ymin) - height) / 2.0f) +
+                  (v_offset * U.dpi_fac);
   BLF_position(font_id, x, y, 0.0f);
   BLF_draw(font_id, str, BLF_DRAW_STR_DUMMY_MAX);
   BLF_batch_draw_flush();
@@ -99,20 +85,17 @@ void icon_draw_rect_input(float x,
                           short event_type,
                           short UNUSED(event_value))
 {
+  rctf rect = {
+      .xmin = (int)x - U.pixelsize,
+      .xmax = (int)(x + w + U.pixelsize),
+      .ymin = (int)(y),
+      .ymax = (int)(y + h),
+  };
   float color[4];
   GPU_line_width(1.0f);
   UI_GetThemeColor4fv(TH_TEXT, color);
   UI_draw_roundbox_corner_set(UI_CNR_ALL);
-  UI_draw_roundbox_aa(
-      &(const rctf){
-          .xmin = (int)x - U.pixelsize,
-          .xmax = (int)(x + w),
-          .ymin = (int)y,
-          .ymax = (int)(y + h),
-      },
-      false,
-      3.0f * U.pixelsize,
-      color);
+  UI_draw_roundbox_aa(&rect, false, 3.0f * U.pixelsize, color);
 
   const enum {
     UNIX,
@@ -129,94 +112,89 @@ void icon_draw_rect_input(float x,
 #endif
       ;
 
-  const rctf rect = {
-      .xmin = x,
-      .ymin = y,
-      .xmax = x + w,
-      .ymax = y + h,
-  };
-
   if ((event_type >= EVT_AKEY) && (event_type <= EVT_ZKEY)) {
     const char str[2] = {'A' + (event_type - EVT_AKEY), '\0'};
-    icon_draw_rect_input_text(&rect, color, str, 13.0f);
+    icon_draw_rect_input_text(&rect, color, str, 13.0f, 0.0f);
   }
-  else if ((event_type >= EVT_F1KEY) && (event_type <= EVT_F12KEY)) {
+  else if ((event_type >= EVT_F1KEY) && (event_type <= EVT_F24KEY)) {
     char str[4];
     SNPRINTF(str, "F%d", 1 + (event_type - EVT_F1KEY));
-    icon_draw_rect_input_text(&rect, color, str, event_type > EVT_F9KEY ? 8.0f : 10.0f);
+    icon_draw_rect_input_text(&rect, color, str, event_type > EVT_F9KEY ? 8.5f : 11.5f, 0.0f);
   }
   else if (event_type == EVT_LEFTSHIFTKEY) { /* Right Shift has already been converted to left. */
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x87, 0xa7, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x87, 0xa7, 0x0}, 16.0f, 0.0f);
   }
   else if (event_type == EVT_LEFTCTRLKEY) { /* Right Shift has already been converted to left. */
     if (platform == MACOS) {
-      icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x8c, 0x83, 0x0});
+      icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x8c, 0x83, 0x0}, 21.0f, -8.0f);
     }
     else {
-      icon_draw_rect_input_text(&rect, color, "Ctrl", 9.0f);
+      icon_draw_rect_input_text(&rect, color, "Ctrl", 9.0f, 0.0f);
     }
   }
   else if (event_type == EVT_LEFTALTKEY) { /* Right Alt has already been converted to left. */
     if (platform == MACOS) {
-      icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x8c, 0xa5, 0x0});
+      icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x8c, 0xa5, 0x0}, 13.0f, 0.0f);
     }
     else {
-      icon_draw_rect_input_text(&rect, color, "Alt", 10.0f);
+      icon_draw_rect_input_text(&rect, color, "Alt", 10.0f, 0.0f);
     }
   }
   else if (event_type == EVT_OSKEY) {
     if (platform == MACOS) {
-      icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x8c, 0x98, 0x0});
+      icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x8c, 0x98, 0x0}, 16.0f, 0.0f);
     }
     else if (platform == MSWIN) {
-      icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x9d, 0x96, 0x0});
+      icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x9d, 0x96, 0x0}, 16.0f, 0.0f);
     }
     else {
-      icon_draw_rect_input_text(&rect, color, "OS", 10.0f);
+      icon_draw_rect_input_text(&rect, color, "OS", 10.0f, 0.0f);
     }
   }
   else if (event_type == EVT_DELKEY) {
-    icon_draw_rect_input_text(&rect, color, "Del", 9.0f);
+    icon_draw_rect_input_text(&rect, color, "Del", 9.0f, 0.0f);
   }
   else if (event_type == EVT_TABKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0xad, 0xbe, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0xad, 0xbe, 0x0}, 18.0f, -1.5f);
   }
   else if (event_type == EVT_HOMEKEY) {
-    icon_draw_rect_input_text(&rect, color, "Home", 6.0f);
+    icon_draw_rect_input_text(&rect, color, "Home", 6.0f, 0.0f);
   }
   else if (event_type == EVT_ENDKEY) {
-    icon_draw_rect_input_text(&rect, color, "End", 8.0f);
+    icon_draw_rect_input_text(&rect, color, "End", 8.0f, 0.0f);
   }
   else if (event_type == EVT_RETKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x8f, 0x8e, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x8f, 0x8e, 0x0}, 17.0f, -1.0f);
   }
   else if (event_type == EVT_ESCKEY) {
     if (platform == MACOS) {
-      icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x8e, 0x8b, 0x0});
+      icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x8e, 0x8b, 0x0}, 21.0f, -1.0f);
     }
     else {
-      icon_draw_rect_input_text(&rect, color, "Esc", 8.0f);
+      icon_draw_rect_input_text(&rect, color, "Esc", 8.5f, 0.0f);
     }
   }
   else if (event_type == EVT_PAGEUPKEY) {
-    icon_draw_rect_input_text(&rect, color, (const char[]){'P', 0xe2, 0x86, 0x91, 0x0}, 8.0f);
+    icon_draw_rect_input_text(
+        &rect, color, (const char[]){'P', 0xe2, 0x86, 0x91, 0x0}, 12.0f, 0.0f);
   }
   else if (event_type == EVT_PAGEDOWNKEY) {
-    icon_draw_rect_input_text(&rect, color, (const char[]){'P', 0xe2, 0x86, 0x93, 0x0}, 8.0f);
+    icon_draw_rect_input_text(
+        &rect, color, (const char[]){'P', 0xe2, 0x86, 0x93, 0x0}, 12.0f, 0.0f);
   }
   else if (event_type == EVT_LEFTARROWKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x86, 0x90, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x86, 0x90, 0x0}, 18.0f, -1.5f);
   }
   else if (event_type == EVT_UPARROWKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x86, 0x91, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x86, 0x91, 0x0}, 16.0f, 0.0f);
   }
   else if (event_type == EVT_RIGHTARROWKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x86, 0x92, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x86, 0x92, 0x0}, 18.0f, -1.5f);
   }
   else if (event_type == EVT_DOWNARROWKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x86, 0x93, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x86, 0x93, 0x0}, 16.0f, 0.0f);
   }
   else if (event_type == EVT_SPACEKEY) {
-    icon_draw_rect_input_symbol(&rect, color, (const char[]){0xe2, 0x90, 0xa3, 0x0});
+    icon_draw_rect_input_text(&rect, color, (const char[]){0xe2, 0x90, 0xa3, 0x0}, 20.0f, 2.0f);
   }
 }
diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index 5e0382f73a9..6ef7d346418 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -25,6 +25,7 @@ struct CurveMapping;
 struct CurveProfile;
 struct ID;
 struct ImBuf;
+struct Main;
 struct Scene;
 struct bContext;
 struct bContextStore;
@@ -306,6 +307,8 @@ typedef struct uiButSearch {
 
   uiButSearchCreateFn popup_create_fn;
   uiButSearchUpdateFn items_update_fn;
+  uiButSearchListenFn listen_fn;
+
   void *item_active;
 
   void *arg;
@@ -343,20 +346,12 @@ typedef struct uiButProgressbar {
   float progress;
 } uiButProgressbar;
 
-/** Derived struct for #UI_BTYPE_TREEROW. */
-typedef struct uiButTreeRow {
-  uiBut but;
-
-  uiTreeViewItemHandle *tree_item;
-  int indentation;
-} uiButTreeRow;
-
-/** Derived struct for #UI_BTYPE_GRID_TILE. */
-typedef struct uiButGridTile {
+typedef struct uiButViewItem {
   uiBut but;
 
-  uiGridViewItemHandle *view_item;
-} uiButGridTile;
+  /* C-Handle to the view item this button was created for. */
+  uiViewItemHandle *view_item;
+} uiButViewItem;
 
 /** Derived struct for #UI_BTYPE_HSVCUBE. */
 typedef struct uiButHSVCube {
@@ -476,6 +471,7 @@ typedef enum uiButtonGroupFlag {
   /** The buttons in this group are inside a panel header. */
   UI_BUTTON_GROUP_PANEL_HEADER = (1 << 1),
 } uiButtonGroupFlag;
+ENUM_OPERATORS(uiButtonGroupFlag, UI_BUTTON_GROUP_PANEL_HEADER);
 
 struct uiBlock {
   uiBlock *next, *prev;
@@ -1372,7 +1368,6 @@ void ui_but_anim_decorate_update_from_flag(uiButDecorator *but);
 bool ui_but_is_editable(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 bool ui_but_is_editable_as_text(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 bool ui_but_is_toggle(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
-bool ui_but_is_view_item(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 /**
  * Can we mouse over the button or is it hidden/disabled/layout.
  * \note ctrl is kind of a hack currently,
@@ -1406,9 +1401,7 @@ uiBut *ui_list_row_find_from_index(const struct ARegion *region,
                                    uiBut *listbox) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_view_item_find_mouse_over(const struct ARegion *region, const int xy[2])
     ATTR_NONNULL(1, 2);
-uiBut *ui_tree_row_find_mouse_over(const struct ARegion *region, const int xy[2])
-    ATTR_NONNULL(1, 2);
-uiBut *ui_tree_row_find_active(const struct ARegion *region);
+uiBut *ui_view_item_find_active(const struct ARegion *region);
 
 typedef bool (*uiButFindPollFn)(const uiBut *but, const void *customdata);
 /**
@@ -1546,13 +1539,19 @@ void ui_block_free_views(struct uiBlock *block);
 uiViewHandle *ui_block_view_find_matching_in_old_block(const uiBlock *new_block,
                                                        const uiViewHandle *new_view);
 
-uiButTreeRow *ui_block_view_find_treerow_in_old_block(const uiBlock *new_block,
-                                                      const uiTreeViewItemHandle *new_item_handle);
+uiButViewItem *ui_block_view_find_matching_view_item_but_in_old_block(
+    const uiBlock *new_block, const uiViewItemHandle *new_item_handle);
 
 /* interface_templates.c */
 
 struct uiListType *UI_UL_cache_file_layers(void);
 
+struct ID *ui_template_id_liboverride_hierarchy_make(struct bContext *C,
+                                                     struct Main *bmain,
+                                                     struct ID *owner_id,
+                                                     struct ID *id,
+                                                     const char **r_undo_push_label);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/blender/editors/interface/interface_layout.c b/source/blender/editors/interface/interface_layout.c
index 3465373c85d..d002dd643c3 100644
--- a/source/blender/editors/interface/interface_layout.c
+++ b/source/blender/editors/interface/interface_layout.c
@@ -694,7 +694,7 @@ static void ui_item_array(uiLayout *layout,
     else {
       /* Even if 'expand' is false, we expand anyway. */
 
-      /* layout for known array subtypes */
+      /* Layout for known array sub-types. */
       char str[3] = {'\0'};
 
       if (!icon_only && show_text) {
@@ -3028,7 +3028,14 @@ void uiItemMContents(uiLayout *layout, const char *menuname)
   if (WM_menutype_poll(C, mt) == false) {
     return;
   }
+
+  bContextStore *previous_ctx = CTX_store_get(C);
   UI_menutype_draw(C, mt, layout);
+
+  /* Restore context that was cleared by `UI_menutype_draw`. */
+  if (layout->context) {
+    CTX_store_set(C, previous_ctx);
+  }
 }
 
 void uiItemDecoratorR_prop(uiLayout *layout, PointerRNA *ptr, PropertyRNA *prop, int index)
diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.cc
index aafb56119ae..603b2c96713 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.cc
@@ -5,7 +5,7 @@
  * \ingroup edinterface
  */
 
-#include <string.h>
+#include <cstring>
 
 #include "MEM_guardedalloc.h"
 
@@ -21,6 +21,7 @@
 
 #include "BLF_api.h"
 #include "BLT_lang.h"
+#include "BLT_translation.h"
 
 #include "BKE_context.h"
 #include "BKE_global.h"
@@ -28,6 +29,7 @@
 #include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_lib_override.h"
+#include "BKE_lib_remap.h"
 #include "BKE_material.h"
 #include "BKE_node.h"
 #include "BKE_report.h"
@@ -40,6 +42,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 #include "RNA_types.h"
 
@@ -127,13 +130,13 @@ static int copy_data_path_button_exec(bContext *C, wmOperator *op)
   /* try to create driver using property retrieved from UI */
   UI_context_active_but_prop_get(C, &ptr, &prop, &index);
 
-  if (ptr.owner_id != NULL) {
+  if (ptr.owner_id != nullptr) {
     if (full_path) {
       if (prop) {
-        path = RNA_path_full_property_py_ex(bmain, &ptr, prop, index, true);
+        path = RNA_path_full_property_py_ex(&ptr, prop, index, true);
       }
       else {
-        path = RNA_path_full_struct_py(bmain, &ptr);
+        path = RNA_path_full_struct_py(&ptr);
       }
     }
     else {
@@ -216,7 +219,7 @@ static int copy_as_driver_button_exec(bContext *C, wmOperator *op)
 
   if (ptr.owner_id && ptr.data && prop) {
     ID *id;
-    const int dim = RNA_property_array_dimension(&ptr, prop, NULL);
+    const int dim = RNA_property_array_dimension(&ptr, prop, nullptr);
     char *path = RNA_path_from_real_ID_to_property_index(bmain, &ptr, prop, dim, index, &id);
 
     if (path) {
@@ -260,25 +263,25 @@ static bool copy_python_command_button_poll(bContext *C)
 {
   uiBut *but = UI_context_active_but_get(C);
 
-  if (but && (but->optype != NULL)) {
-    return 1;
+  if (but && (but->optype != nullptr)) {
+    return true;
   }
 
-  return 0;
+  return false;
 }
 
 static int copy_python_command_button_exec(bContext *C, wmOperator *UNUSED(op))
 {
   uiBut *but = UI_context_active_but_get(C);
 
-  if (but && (but->optype != NULL)) {
+  if (but && (but->optype != nullptr)) {
     PointerRNA *opptr;
     char *str;
     opptr = UI_but_operator_ptr_get(but); /* allocated when needed, the button owns it */
 
-    str = WM_operator_pystring_ex(C, NULL, false, true, but->optype, opptr);
+    str = WM_operator_pystring_ex(C, nullptr, false, true, but->optype, opptr);
 
-    WM_clipboard_text_set(str, 0);
+    WM_clipboard_text_set(str, false);
 
     MEM_freeN(str);
 
@@ -390,7 +393,8 @@ static void UI_OT_reset_default_button(wmOperatorType *ot)
   ot->flag = 0;
 
   /* properties */
-  RNA_def_boolean(ot->srna, "all", 1, "All", "Reset to default values all elements of the array");
+  RNA_def_boolean(
+      ot->srna, "all", true, "All", "Reset to default values all elements of the array");
 }
 
 /** \} */
@@ -529,7 +533,7 @@ static EnumPropertyItem override_type_items[] = {
      0,
      "Factor",
      "Store factor to linked data value (useful e.g. for scale)"},
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 static bool override_type_set_button_poll(bContext *C)
@@ -580,16 +584,16 @@ static int override_type_set_button_exec(bContext *C, wmOperator *op)
   /* try to reset the nominated setting to its default value */
   UI_context_active_but_prop_get(C, &ptr, &prop, &index);
 
-  BLI_assert(ptr.owner_id != NULL);
+  BLI_assert(ptr.owner_id != nullptr);
 
   if (all) {
     index = -1;
   }
 
   IDOverrideLibraryPropertyOperation *opop = RNA_property_override_property_operation_get(
-      CTX_data_main(C), &ptr, prop, operation, index, true, NULL, &created);
+      CTX_data_main(C), &ptr, prop, operation, index, true, nullptr, &created);
 
-  if (opop == NULL) {
+  if (opop == nullptr) {
     /* Sometimes e.g. RNA cannot generate a path to the given property. */
     BKE_reportf(op->reports, RPT_WARNING, "Failed to create the override operation");
     return OPERATOR_CANCELLED;
@@ -600,7 +604,7 @@ static int override_type_set_button_exec(bContext *C, wmOperator *op)
   }
 
   /* Outliner e.g. has to be aware of this change. */
-  WM_main_add_notifier(NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+  WM_main_add_notifier(NC_WM | ND_LIB_OVERRIDE_CHANGED, nullptr);
 
   return operator_button_property_finish(C, &ptr, prop);
 }
@@ -633,7 +637,8 @@ static void UI_OT_override_type_set_button(wmOperatorType *ot)
   ot->flag = OPTYPE_UNDO;
 
   /* properties */
-  RNA_def_boolean(ot->srna, "all", 1, "All", "Reset to default values all elements of the array");
+  RNA_def_boolean(
+      ot->srna, "all", true, "All", "Reset to default values all elements of the array");
   ot->prop = RNA_def_enum(ot->srna,
                           "type",
                           override_type_items,
@@ -670,8 +675,8 @@ static int override_remove_button_exec(bContext *C, wmOperator *op)
 
   ID *id = ptr.owner_id;
   IDOverrideLibraryProperty *oprop = RNA_property_override_property_find(bmain, &ptr, prop, &id);
-  BLI_assert(oprop != NULL);
-  BLI_assert(id != NULL && id->override_library != NULL);
+  BLI_assert(oprop != nullptr);
+  BLI_assert(id != nullptr && id->override_library != nullptr);
 
   const bool is_template = ID_IS_OVERRIDE_LIBRARY_TEMPLATE(id);
 
@@ -690,8 +695,8 @@ static int override_remove_button_exec(bContext *C, wmOperator *op)
     /* Remove override operation for given item,
      * add singular operations for the other items as needed. */
     IDOverrideLibraryPropertyOperation *opop = BKE_lib_override_library_property_operation_find(
-        oprop, NULL, NULL, index, index, false, &is_strict_find);
-    BLI_assert(opop != NULL);
+        oprop, nullptr, nullptr, index, index, false, &is_strict_find);
+    BLI_assert(opop != nullptr);
     if (!is_strict_find) {
       /* No specific override operation, we have to get generic one,
        * and create item-specific override operations for all but given index,
@@ -699,7 +704,7 @@ static int override_remove_button_exec(bContext *C, wmOperator *op)
       for (int idx = RNA_property_array_length(&ptr, prop); idx--;) {
         if (idx != index) {
           BKE_lib_override_library_property_operation_get(
-              oprop, opop->operation, NULL, NULL, idx, idx, true, NULL, NULL);
+              oprop, opop->operation, nullptr, nullptr, idx, idx, true, nullptr, nullptr);
         }
       }
     }
@@ -720,7 +725,7 @@ static int override_remove_button_exec(bContext *C, wmOperator *op)
   }
 
   /* Outliner e.g. has to be aware of this change. */
-  WM_main_add_notifier(NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+  WM_main_add_notifier(NC_WM | ND_LIB_OVERRIDE_CHANGED, nullptr);
 
   return operator_button_property_finish(C, &ptr, prop);
 }
@@ -740,7 +745,287 @@ static void UI_OT_override_remove_button(wmOperatorType *ot)
   ot->flag = OPTYPE_UNDO;
 
   /* properties */
-  RNA_def_boolean(ot->srna, "all", 1, "All", "Reset to default values all elements of the array");
+  RNA_def_boolean(
+      ot->srna, "all", true, "All", "Reset to default values all elements of the array");
+}
+
+static void override_idtemplate_ids_get(
+    bContext *C, ID **r_owner_id, ID **r_id, PointerRNA *r_owner_ptr, PropertyRNA **r_prop)
+{
+  PointerRNA owner_ptr;
+  PropertyRNA *prop;
+  UI_context_active_but_prop_get_templateID(C, &owner_ptr, &prop);
+
+  if (owner_ptr.data == nullptr || prop == nullptr) {
+    *r_owner_id = *r_id = nullptr;
+    if (r_owner_ptr != nullptr) {
+      *r_owner_ptr = PointerRNA_NULL;
+    }
+    if (r_prop != nullptr) {
+      *r_prop = nullptr;
+    }
+    return;
+  }
+
+  *r_owner_id = owner_ptr.owner_id;
+  PointerRNA idptr = RNA_property_pointer_get(&owner_ptr, prop);
+  *r_id = static_cast<ID *>(idptr.data);
+  if (r_owner_ptr != nullptr) {
+    *r_owner_ptr = owner_ptr;
+  }
+  if (r_prop != nullptr) {
+    *r_prop = prop;
+  }
+}
+
+static bool override_idtemplate_poll(bContext *C, const bool is_create_op)
+{
+  ID *owner_id, *id;
+  override_idtemplate_ids_get(C, &owner_id, &id, nullptr, nullptr);
+
+  if (owner_id == nullptr || id == nullptr) {
+    return false;
+  }
+
+  if (is_create_op) {
+    if (!ID_IS_LINKED(id) && !ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
+      return false;
+    }
+    return true;
+  }
+
+  /* Reset/Clear operations. */
+  if (ID_IS_LINKED(id) || !ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
+    return false;
+  }
+  return true;
+}
+
+static bool override_idtemplate_make_poll(bContext *C)
+{
+  return override_idtemplate_poll(C, true);
+}
+
+static int override_idtemplate_make_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  ID *owner_id, *id;
+  PointerRNA owner_ptr;
+  PropertyRNA *prop;
+  override_idtemplate_ids_get(C, &owner_id, &id, &owner_ptr, &prop);
+  if (ELEM(nullptr, owner_id, id)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  ID *id_override = ui_template_id_liboverride_hierarchy_make(
+      C, CTX_data_main(C), owner_id, id, nullptr);
+
+  if (id_override == nullptr) {
+    return OPERATOR_CANCELLED;
+  }
+
+  PointerRNA idptr;
+  /* `idptr` is re-assigned to owner property to ensure proper updates etc. Here we also use it
+   * to ensure remapping of the owner property from the linked data to the newly created
+   * liboverride (note that in theory this remapping has already been done by code above), but
+   * only in case owner ID was already local ID (override or pure local data).
+   *
+   * Otherwise, owner ID will also have been overridden, and remapped already to use it's
+   * override of the data too. */
+  if (!ID_IS_LINKED(owner_id)) {
+    RNA_id_pointer_create(id_override, &idptr);
+    RNA_property_pointer_set(&owner_ptr, prop, idptr, nullptr);
+  }
+  RNA_property_update(C, &owner_ptr, prop);
+
+  /* 'Security' extra tagging, since this process may also affect the owner ID and not only the
+   * used ID, relying on the property update code only is not always enough. */
+  DEG_id_tag_update(&CTX_data_scene(C)->id, ID_RECALC_BASE_FLAGS | ID_RECALC_COPY_ON_WRITE);
+  WM_event_add_notifier(C, NC_WINDOW, nullptr);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, nullptr);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
+
+  return OPERATOR_FINISHED;
+}
+
+static void UI_OT_override_idtemplate_make(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Make Library Override";
+  ot->idname = "UI_OT_override_idtemplate_make";
+  ot->description =
+      "Create a local override of the selected linked data-block, and its hierarchy of "
+      "dependencies";
+
+  /* callbacks */
+  ot->poll = override_idtemplate_make_poll;
+  ot->exec = override_idtemplate_make_exec;
+
+  /* flags */
+  ot->flag = OPTYPE_UNDO;
+}
+
+static bool override_idtemplate_reset_poll(bContext *C)
+{
+  return override_idtemplate_poll(C, false);
+}
+
+static int override_idtemplate_reset_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  ID *owner_id, *id;
+  PointerRNA owner_ptr;
+  PropertyRNA *prop;
+  override_idtemplate_ids_get(C, &owner_id, &id, &owner_ptr, &prop);
+  if (ELEM(nullptr, owner_id, id)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  if (ID_IS_LINKED(id) || !ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  BKE_lib_override_library_id_reset(CTX_data_main(C), id, false);
+
+  PointerRNA idptr;
+  /* `idptr` is re-assigned to owner property to ensure proper updates etc. */
+  RNA_id_pointer_create(id, &idptr);
+  RNA_property_pointer_set(&owner_ptr, prop, idptr, nullptr);
+  RNA_property_update(C, &owner_ptr, prop);
+
+  /* No need for 'security' extra tagging here, since this process will never affect the owner ID.
+   */
+
+  return OPERATOR_FINISHED;
+}
+
+static void UI_OT_override_idtemplate_reset(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Reset Library Override";
+  ot->idname = "UI_OT_override_idtemplate_reset";
+  ot->description = "Reset the selected local override to its linked reference values";
+
+  /* callbacks */
+  ot->poll = override_idtemplate_reset_poll;
+  ot->exec = override_idtemplate_reset_exec;
+
+  /* flags */
+  ot->flag = OPTYPE_UNDO;
+}
+
+static bool override_idtemplate_clear_poll(bContext *C)
+{
+  return override_idtemplate_poll(C, false);
+}
+
+static int override_idtemplate_clear_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  ID *owner_id, *id;
+  PointerRNA owner_ptr;
+  PropertyRNA *prop;
+  override_idtemplate_ids_get(C, &owner_id, &id, &owner_ptr, &prop);
+  if (ELEM(nullptr, owner_id, id)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  if (ID_IS_LINKED(id)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  Main *bmain = CTX_data_main(C);
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  Scene *scene = CTX_data_scene(C);
+  ID *id_new = id;
+
+  if (BKE_lib_override_library_is_hierarchy_leaf(bmain, id)) {
+    id_new = id->override_library->reference;
+    bool do_remap_active = false;
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (BKE_view_layer_active_object_get(view_layer) == (Object *)id) {
+      BLI_assert(GS(id->name) == ID_OB);
+      BLI_assert(GS(id_new->name) == ID_OB);
+      do_remap_active = true;
+    }
+    BKE_libblock_remap(bmain, id, id_new, ID_REMAP_SKIP_INDIRECT_USAGE);
+    if (do_remap_active) {
+      Object *ref_object = (Object *)id_new;
+      Base *basact = BKE_view_layer_base_find(view_layer, ref_object);
+      if (basact != nullptr) {
+        view_layer->basact = basact;
+      }
+      DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
+    }
+    BKE_id_delete(bmain, id);
+  }
+  else {
+    BKE_lib_override_library_id_reset(bmain, id, true);
+  }
+
+  /* Here the affected ID may remain the same, or be replaced by its linked reference. In either
+   * case, the owner ID remains unchanged, and remapping is already handled by internal code, so
+   * calling `RNA_property_update` on it is enough to ensure proper notifiers are sent. */
+  RNA_property_update(C, &owner_ptr, prop);
+
+  /* 'Security' extra tagging, since this process may also affect the owner ID and not only the
+   * used ID, relying on the property update code only is not always enough. */
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS | ID_RECALC_COPY_ON_WRITE);
+  WM_event_add_notifier(C, NC_WINDOW, nullptr);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, nullptr);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
+
+  return OPERATOR_FINISHED;
+}
+
+static void UI_OT_override_idtemplate_clear(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Clear Library Override";
+  ot->idname = "UI_OT_override_idtemplate_clear";
+  ot->description =
+      "Delete the selected local override and relink its usages to the linked data-block if "
+      "possible, else reset it and mark it as non editable";
+
+  /* callbacks */
+  ot->poll = override_idtemplate_clear_poll;
+  ot->exec = override_idtemplate_clear_exec;
+
+  /* flags */
+  ot->flag = OPTYPE_UNDO;
+}
+
+static bool override_idtemplate_menu_poll(const bContext *C_const, MenuType *UNUSED(mt))
+{
+  bContext *C = (bContext *)C_const;
+  ID *owner_id, *id;
+  override_idtemplate_ids_get(C, &owner_id, &id, nullptr, nullptr);
+
+  if (owner_id == nullptr || id == nullptr) {
+    return false;
+  }
+
+  if (!(ID_IS_LINKED(id) || ID_IS_OVERRIDE_LIBRARY_REAL(id))) {
+    return false;
+  }
+  return true;
+}
+
+static void override_idtemplate_menu_draw(const bContext *UNUSED(C), Menu *menu)
+{
+  uiLayout *layout = menu->layout;
+  uiItemO(layout, IFACE_("Make"), ICON_NONE, "UI_OT_override_idtemplate_make");
+  uiItemO(layout, IFACE_("Reset"), ICON_NONE, "UI_OT_override_idtemplate_reset");
+  uiItemO(layout, IFACE_("Clear"), ICON_NONE, "UI_OT_override_idtemplate_clear");
+}
+
+static void override_idtemplate_menu()
+{
+  MenuType *mt;
+
+  mt = MEM_cnew<MenuType>(__func__);
+  strcpy(mt->idname, "UI_MT_idtemplate_liboverride");
+  strcpy(mt->label, N_("Library Override"));
+  mt->poll = override_idtemplate_menu_poll;
+  mt->draw = override_idtemplate_menu_draw;
+  WM_menutype_add(mt);
 }
 
 /** \} */
@@ -749,8 +1034,8 @@ static void UI_OT_override_remove_button(wmOperatorType *ot)
 /** \name Copy To Selected Operator
  * \{ */
 
-#define NOT_NULL(assignment) ((assignment) != NULL)
-#define NOT_RNA_NULL(assignment) ((assignment).data != NULL)
+#define NOT_NULL(assignment) ((assignment) != nullptr)
+#define NOT_RNA_NULL(assignment) ((assignment).data != nullptr)
 
 static void ui_context_selected_bones_via_pose(bContext *C, ListBase *r_lb)
 {
@@ -759,7 +1044,7 @@ static void ui_context_selected_bones_via_pose(bContext *C, ListBase *r_lb)
 
   if (!BLI_listbase_is_empty(&lb)) {
     LISTBASE_FOREACH (CollectionPointerLink *, link, &lb) {
-      bPoseChannel *pchan = link->ptr.data;
+      bPoseChannel *pchan = static_cast<bPoseChannel *>(link->ptr.data);
       RNA_pointer_create(link->ptr.owner_id, &RNA_Bone, pchan->bone, &link->ptr);
     }
   }
@@ -775,9 +1060,9 @@ bool UI_context_copy_to_selected_list(bContext *C,
                                       char **r_path)
 {
   *r_use_path_from_id = false;
-  *r_path = NULL;
+  *r_path = nullptr;
   /* special case for bone constraints */
-  char *path_from_bone = NULL;
+  char *path_from_bone = nullptr;
   /* Remove links from the collection list which don't contain 'prop'. */
   bool ensure_list_items_contain_prop = false;
 
@@ -791,29 +1076,32 @@ bool UI_context_copy_to_selected_list(bContext *C,
    */
   if (!RNA_property_is_idprop(prop) && RNA_struct_is_a(ptr->type, &RNA_PropertyGroup)) {
     PointerRNA owner_ptr;
-    char *idpath = NULL;
+    char *idpath = nullptr;
 
     /* First, check the active PoseBone and PoseBone->Bone. */
     if (NOT_RNA_NULL(
             owner_ptr = CTX_data_pointer_get_type(C, "active_pose_bone", &RNA_PoseBone))) {
-      if (NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(&owner_ptr, ptr->data))) {
+      if (NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(
+                       &owner_ptr, static_cast<IDProperty *>(ptr->data)))) {
         *r_lb = CTX_data_collection_get(C, "selected_pose_bones");
       }
       else {
-        bPoseChannel *pchan = owner_ptr.data;
+        bPoseChannel *pchan = static_cast<bPoseChannel *>(owner_ptr.data);
         RNA_pointer_create(owner_ptr.owner_id, &RNA_Bone, pchan->bone, &owner_ptr);
 
-        if (NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(&owner_ptr, ptr->data))) {
+        if (NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(
+                         &owner_ptr, static_cast<IDProperty *>(ptr->data)))) {
           ui_context_selected_bones_via_pose(C, r_lb);
         }
       }
     }
 
-    if (idpath == NULL) {
+    if (idpath == nullptr) {
       /* Check the active EditBone if in edit mode. */
       if (NOT_RNA_NULL(
               owner_ptr = CTX_data_pointer_get_type_silent(C, "active_bone", &RNA_EditBone)) &&
-          NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(&owner_ptr, ptr->data))) {
+          NOT_NULL(idpath = RNA_path_from_struct_to_idproperty(
+                       &owner_ptr, static_cast<IDProperty *>(ptr->data)))) {
         *r_lb = CTX_data_collection_get(C, "selected_editable_bones");
       }
 
@@ -866,30 +1154,30 @@ bool UI_context_copy_to_selected_list(bContext *C,
   }
   else if (RNA_struct_is_a(ptr->type, &RNA_Constraint) &&
            (path_from_bone = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_PoseBone)) !=
-               NULL) {
+               nullptr) {
     *r_lb = CTX_data_collection_get(C, "selected_pose_bones");
     *r_path = path_from_bone;
   }
   else if (RNA_struct_is_a(ptr->type, &RNA_Node) || RNA_struct_is_a(ptr->type, &RNA_NodeSocket)) {
-    ListBase lb = {NULL, NULL};
-    char *path = NULL;
-    bNode *node = NULL;
+    ListBase lb = {nullptr, nullptr};
+    char *path = nullptr;
+    bNode *node = nullptr;
 
     /* Get the node we're editing */
     if (RNA_struct_is_a(ptr->type, &RNA_NodeSocket)) {
       bNodeTree *ntree = (bNodeTree *)ptr->owner_id;
-      bNodeSocket *sock = ptr->data;
-      if (nodeFindNode(ntree, sock, &node, NULL)) {
-        if ((path = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_Node)) != NULL) {
+      bNodeSocket *sock = static_cast<bNodeSocket *>(ptr->data);
+      if (nodeFindNode(ntree, sock, &node, nullptr)) {
+        if ((path = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_Node)) != nullptr) {
           /* we're good! */
         }
         else {
-          node = NULL;
+          node = nullptr;
         }
       }
     }
     else {
-      node = ptr->data;
+      node = static_cast<bNode *>(ptr->data);
     }
 
     /* Now filter by type */
@@ -897,7 +1185,7 @@ bool UI_context_copy_to_selected_list(bContext *C,
       lb = CTX_data_collection_get(C, "selected_nodes");
 
       LISTBASE_FOREACH_MUTABLE (CollectionPointerLink *, link, &lb) {
-        bNode *node_data = link->ptr.data;
+        bNode *node_data = static_cast<bNode *>(link->ptr.data);
 
         if (node_data->type != node->type) {
           BLI_remlink(&lb, link);
@@ -928,17 +1216,17 @@ bool UI_context_copy_to_selected_list(bContext *C,
         LISTBASE_FOREACH (CollectionPointerLink *, link, &lb) {
           Object *ob = (Object *)link->ptr.owner_id;
           if (ob->data) {
-            ID *id_data = ob->data;
+            ID *id_data = static_cast<ID *>(ob->data);
             id_data->tag |= LIB_TAG_DOIT;
           }
         }
 
         LISTBASE_FOREACH_MUTABLE (CollectionPointerLink *, link, &lb) {
           Object *ob = (Object *)link->ptr.owner_id;
-          ID *id_data = ob->data;
+          ID *id_data = static_cast<ID *>(ob->data);
 
-          if ((id_data == NULL) || (id_data->tag & LIB_TAG_DOIT) == 0 || ID_IS_LINKED(id_data) ||
-              (GS(id_data->name) != id_code)) {
+          if ((id_data == nullptr) || (id_data->tag & LIB_TAG_DOIT) == 0 ||
+              ID_IS_LINKED(id_data) || (GS(id_data->name) != id_code)) {
             BLI_remlink(&lb, link);
             MEM_freeN(link);
           }
@@ -960,7 +1248,8 @@ bool UI_context_copy_to_selected_list(bContext *C,
       /* Sequencer's ID is scene :/ */
       /* Try to recursively find an RNA_Sequence ancestor,
        * to handle situations like T41062... */
-      if ((*r_path = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_Sequence)) != NULL) {
+      if ((*r_path = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_Sequence)) !=
+          nullptr) {
         /* Special case when we do this for 'Sequence.lock'.
          * (if the sequence is locked, it won't be in "selected_editable_sequences"). */
         const char *prop_id = RNA_property_identifier(prop);
@@ -974,7 +1263,7 @@ bool UI_context_copy_to_selected_list(bContext *C,
         ensure_list_items_contain_prop = true;
       }
     }
-    return (*r_path != NULL);
+    return (*r_path != nullptr);
   }
   else {
     return false;
@@ -1012,13 +1301,13 @@ bool UI_context_copy_to_selected_check(PointerRNA *ptr,
 
   if (use_path_from_id) {
     /* Path relative to ID. */
-    lprop = NULL;
+    lprop = nullptr;
     RNA_id_pointer_create(ptr_link->owner_id, &idptr);
     RNA_path_resolve_property(&idptr, path, &lptr, &lprop);
   }
   else if (path) {
     /* Path relative to elements from list. */
-    lprop = NULL;
+    lprop = nullptr;
     RNA_path_resolve_property(ptr_link, path, &lptr, &lprop);
   }
   else {
@@ -1033,7 +1322,7 @@ bool UI_context_copy_to_selected_check(PointerRNA *ptr,
 
   /* Skip non-existing properties on link. This was previously covered with the `lprop != prop`
    * check but we are now more permissive when it comes to ID properties, see below. */
-  if (lprop == NULL) {
+  if (lprop == nullptr) {
     return false;
   }
 
@@ -1104,13 +1393,13 @@ static bool copy_to_selected_button(bContext *C, bool all, bool poll)
   UI_context_active_but_prop_get(C, &ptr, &prop, &index);
 
   /* if there is a valid property that is editable... */
-  if (ptr.data == NULL || prop == NULL) {
+  if (ptr.data == nullptr || prop == nullptr) {
     return false;
   }
 
-  char *path = NULL;
+  char *path = nullptr;
   bool use_path_from_id;
-  ListBase lb = {NULL};
+  ListBase lb = {nullptr};
 
   if (!UI_context_copy_to_selected_list(C, &ptr, prop, &lb, &use_path_from_id, &path)) {
     return false;
@@ -1197,7 +1486,7 @@ static bool jump_to_target_ptr(bContext *C, PointerRNA ptr, const bool poll)
 
   /* Verify pointer type. */
   char bone_name[MAXBONENAME];
-  const StructRNA *target_type = NULL;
+  const StructRNA *target_type = nullptr;
 
   if (ELEM(ptr.type, &RNA_EditBone, &RNA_PoseBone, &RNA_Bone)) {
     RNA_string_get(&ptr, "name", bone_name);
@@ -1209,23 +1498,25 @@ static bool jump_to_target_ptr(bContext *C, PointerRNA ptr, const bool poll)
     target_type = &RNA_Object;
   }
 
-  if (target_type == NULL) {
+  if (target_type == nullptr) {
     return false;
   }
 
   /* Find the containing Object. */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = NULL;
+  Base *base = nullptr;
   const short id_type = GS(ptr.owner_id->name);
   if (id_type == ID_OB) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
     base = BKE_view_layer_base_find(view_layer, (Object *)ptr.owner_id);
   }
   else if (OB_DATA_SUPPORT_ID(id_type)) {
-    base = ED_object_find_first_by_data_id(view_layer, ptr.owner_id);
+    base = ED_object_find_first_by_data_id(scene, view_layer, ptr.owner_id);
   }
 
   bool ok = false;
-  if ((base == NULL) || ((target_type == &RNA_Bone) && (base->object->type != OB_ARMATURE))) {
+  if ((base == nullptr) || ((target_type == &RNA_Bone) && (base->object->type != OB_ARMATURE))) {
     /* pass */
   }
   else if (poll) {
@@ -1277,16 +1568,22 @@ static bool jump_to_target_button(bContext *C, bool poll)
     if (type == PROP_STRING) {
       const uiBut *but = UI_context_active_but_get(C);
       const uiButSearch *search_but = (but->type == UI_BTYPE_SEARCH_MENU) ? (uiButSearch *)but :
-                                                                            NULL;
+                                                                            nullptr;
 
       if (search_but && search_but->items_update_fn == ui_rna_collection_search_update_fn) {
-        uiRNACollectionSearch *coll_search = search_but->arg;
+        uiRNACollectionSearch *coll_search = static_cast<uiRNACollectionSearch *>(search_but->arg);
 
         char str_buf[MAXBONENAME];
-        char *str_ptr = RNA_property_string_get_alloc(&ptr, prop, str_buf, sizeof(str_buf), NULL);
-
-        int found = RNA_property_collection_lookup_string(
-            &coll_search->search_ptr, coll_search->search_prop, str_ptr, &target_ptr);
+        char *str_ptr = RNA_property_string_get_alloc(
+            &ptr, prop, str_buf, sizeof(str_buf), nullptr);
+
+        int found = 0;
+        /* Jump to target only works with search properties currently, not search callbacks yet.
+         * See ui_but_add_search. */
+        if (coll_search->search_prop != NULL) {
+          found = RNA_property_collection_lookup_string(
+              &coll_search->search_ptr, coll_search->search_prop, str_ptr, &target_ptr);
+        }
 
         if (str_ptr != str_buf) {
           MEM_freeN(str_ptr);
@@ -1338,42 +1635,42 @@ static void UI_OT_jump_to_target_button(wmOperatorType *ot)
 #ifdef WITH_PYTHON
 
 /* ------------------------------------------------------------------------- */
-/* EditSource Utility funcs and operator,
+/* EditSource Utility functions and operator,
  * NOTE: this includes utility functions and button matching checks. */
 
-typedef struct uiEditSourceStore {
+struct uiEditSourceStore {
   uiBut but_orig;
   GHash *hash;
-} uiEditSourceStore;
+};
 
-typedef struct uiEditSourceButStore {
+struct uiEditSourceButStore {
   char py_dbg_fn[FILE_MAX];
   int py_dbg_line_number;
-} uiEditSourceButStore;
+};
 
 /* should only ever be set while the edit source operator is running */
-static struct uiEditSourceStore *ui_editsource_info = NULL;
+static uiEditSourceStore *ui_editsource_info = nullptr;
 
 bool UI_editsource_enable_check(void)
 {
-  return (ui_editsource_info != NULL);
+  return (ui_editsource_info != nullptr);
 }
 
 static void ui_editsource_active_but_set(uiBut *but)
 {
-  BLI_assert(ui_editsource_info == NULL);
+  BLI_assert(ui_editsource_info == nullptr);
 
-  ui_editsource_info = MEM_callocN(sizeof(uiEditSourceStore), __func__);
+  ui_editsource_info = MEM_cnew<uiEditSourceStore>(__func__);
   memcpy(&ui_editsource_info->but_orig, but, sizeof(uiBut));
 
   ui_editsource_info->hash = BLI_ghash_ptr_new(__func__);
 }
 
-static void ui_editsource_active_but_clear(void)
+static void ui_editsource_active_but_clear()
 {
-  BLI_ghash_free(ui_editsource_info->hash, NULL, MEM_freeN);
+  BLI_ghash_free(ui_editsource_info->hash, nullptr, MEM_freeN);
   MEM_freeN(ui_editsource_info);
-  ui_editsource_info = NULL;
+  ui_editsource_info = nullptr;
 }
 
 static bool ui_editsource_uibut_match(uiBut *but_a, uiBut *but_b)
@@ -1394,11 +1691,14 @@ static bool ui_editsource_uibut_match(uiBut *but_a, uiBut *but_b)
   return false;
 }
 
+extern "C" {
+void PyC_FileAndNum_Safe(const char **r_filename, int *r_lineno);
+}
+
 void UI_editsource_active_but_test(uiBut *but)
 {
-  extern void PyC_FileAndNum_Safe(const char **r_filename, int *r_lineno);
 
-  struct uiEditSourceButStore *but_store = MEM_callocN(sizeof(uiEditSourceButStore), __func__);
+  uiEditSourceButStore *but_store = MEM_cnew<uiEditSourceButStore>(__func__);
 
   const char *fn;
   int line_number = -1;
@@ -1423,9 +1723,10 @@ void UI_editsource_active_but_test(uiBut *but)
 
 void UI_editsource_but_replace(const uiBut *old_but, uiBut *new_but)
 {
-  uiEditSourceButStore *but_store = BLI_ghash_lookup(ui_editsource_info->hash, old_but);
+  uiEditSourceButStore *but_store = static_cast<uiEditSourceButStore *>(
+      BLI_ghash_lookup(ui_editsource_info->hash, old_but));
   if (but_store) {
-    BLI_ghash_remove(ui_editsource_info->hash, old_but, NULL, NULL);
+    BLI_ghash_remove(ui_editsource_info->hash, old_but, nullptr, nullptr);
     BLI_ghash_insert(ui_editsource_info->hash, new_but, but_store);
   }
 }
@@ -1435,8 +1736,8 @@ static int editsource_text_edit(bContext *C,
                                 const char filepath[FILE_MAX],
                                 const int line)
 {
-  struct Main *bmain = CTX_data_main(C);
-  Text *text = NULL;
+  Main *bmain = CTX_data_main(C);
+  Text *text = nullptr;
 
   /* Developers may wish to copy-paste to an external editor. */
   printf("%s:%d\n", filepath, line);
@@ -1448,11 +1749,11 @@ static int editsource_text_edit(bContext *C,
     }
   }
 
-  if (text == NULL) {
+  if (text == nullptr) {
     text = BKE_text_load(bmain, filepath, BKE_main_blendfile_path(bmain));
   }
 
-  if (text == NULL) {
+  if (text == nullptr) {
     BKE_reportf(op->reports, RPT_WARNING, "File '%s' cannot be opened", filepath);
     return OPERATOR_CANCELLED;
   }
@@ -1476,7 +1777,7 @@ static int editsource_exec(bContext *C, wmOperator *op)
 
   if (but) {
     GHashIterator ghi;
-    struct uiEditSourceButStore *but_store = NULL;
+    uiEditSourceButStore *but_store = nullptr;
 
     ARegion *region = CTX_wm_region(C);
     int ret;
@@ -1495,9 +1796,9 @@ static int editsource_exec(bContext *C, wmOperator *op)
     for (BLI_ghashIterator_init(&ghi, ui_editsource_info->hash);
          BLI_ghashIterator_done(&ghi) == false;
          BLI_ghashIterator_step(&ghi)) {
-      uiBut *but_key = BLI_ghashIterator_getKey(&ghi);
+      uiBut *but_key = static_cast<uiBut *>(BLI_ghashIterator_getKey(&ghi));
       if (but_key && ui_editsource_uibut_match(&ui_editsource_info->but_orig, but_key)) {
-        but_store = BLI_ghashIterator_getValue(&ghi);
+        but_store = static_cast<uiEditSourceButStore *>(BLI_ghashIterator_getValue(&ghi));
         break;
       }
     }
@@ -1546,7 +1847,7 @@ static void UI_OT_editsource(wmOperatorType *ot)
  * \{ */
 
 /**
- * EditTranslation utility funcs and operator,
+ * EditTranslation utility functions and operator.
  *
  * \note this includes utility functions and button matching checks.
  * this only works in conjunction with a Python operator!
@@ -1568,7 +1869,7 @@ static void edittranslation_find_po_file(const char *root,
 
   /* Now try without the second iso code part (_ES in es_ES). */
   {
-    const char *tc = NULL;
+    const char *tc = nullptr;
     size_t szt = 0;
     tstr[0] = '\0';
 
@@ -1602,7 +1903,7 @@ static void edittranslation_find_po_file(const char *root,
 static int edittranslation_exec(bContext *C, wmOperator *op)
 {
   uiBut *but = UI_context_active_but_get(C);
-  if (but == NULL) {
+  if (but == nullptr) {
     BKE_report(op->reports, RPT_ERROR, "Active button not found");
     return OPERATOR_CANCELLED;
   }
@@ -1613,16 +1914,16 @@ static int edittranslation_exec(bContext *C, wmOperator *op)
   const char *root = U.i18ndir;
   const char *uilng = BLT_lang_get();
 
-  uiStringInfo but_label = {BUT_GET_LABEL, NULL};
-  uiStringInfo rna_label = {BUT_GET_RNA_LABEL, NULL};
-  uiStringInfo enum_label = {BUT_GET_RNAENUM_LABEL, NULL};
-  uiStringInfo but_tip = {BUT_GET_TIP, NULL};
-  uiStringInfo rna_tip = {BUT_GET_RNA_TIP, NULL};
-  uiStringInfo enum_tip = {BUT_GET_RNAENUM_TIP, NULL};
-  uiStringInfo rna_struct = {BUT_GET_RNASTRUCT_IDENTIFIER, NULL};
-  uiStringInfo rna_prop = {BUT_GET_RNAPROP_IDENTIFIER, NULL};
-  uiStringInfo rna_enum = {BUT_GET_RNAENUM_IDENTIFIER, NULL};
-  uiStringInfo rna_ctxt = {BUT_GET_RNA_LABEL_CONTEXT, NULL};
+  uiStringInfo but_label = {BUT_GET_LABEL, nullptr};
+  uiStringInfo rna_label = {BUT_GET_RNA_LABEL, nullptr};
+  uiStringInfo enum_label = {BUT_GET_RNAENUM_LABEL, nullptr};
+  uiStringInfo but_tip = {BUT_GET_TIP, nullptr};
+  uiStringInfo rna_tip = {BUT_GET_RNA_TIP, nullptr};
+  uiStringInfo enum_tip = {BUT_GET_RNAENUM_TIP, nullptr};
+  uiStringInfo rna_struct = {BUT_GET_RNASTRUCT_IDENTIFIER, nullptr};
+  uiStringInfo rna_prop = {BUT_GET_RNAPROP_IDENTIFIER, nullptr};
+  uiStringInfo rna_enum = {BUT_GET_RNAENUM_IDENTIFIER, nullptr};
+  uiStringInfo rna_ctxt = {BUT_GET_RNA_LABEL_CONTEXT, nullptr};
 
   if (!BLI_is_dir(root)) {
     BKE_report(op->reports,
@@ -1631,8 +1932,8 @@ static int edittranslation_exec(bContext *C, wmOperator *op)
                "Directory' path to a valid directory");
     return OPERATOR_CANCELLED;
   }
-  ot = WM_operatortype_find(EDTSRC_I18N_OP_NAME, 0);
-  if (ot == NULL) {
+  ot = WM_operatortype_find(EDTSRC_I18N_OP_NAME, false);
+  if (ot == nullptr) {
     BKE_reportf(op->reports,
                 RPT_ERROR,
                 "Could not find operator '%s'! Please enable ui_translate add-on "
@@ -1661,7 +1962,7 @@ static int edittranslation_exec(bContext *C, wmOperator *op)
                          &rna_prop,
                          &rna_enum,
                          &rna_ctxt,
-                         NULL);
+                         nullptr);
 
   WM_operator_properties_create_ptr(&ptr, ot);
   RNA_string_set(&ptr, "lang", uilng);
@@ -1676,7 +1977,7 @@ static int edittranslation_exec(bContext *C, wmOperator *op)
   RNA_string_set(&ptr, "rna_prop", rna_prop.strinfo);
   RNA_string_set(&ptr, "rna_enum", rna_enum.strinfo);
   RNA_string_set(&ptr, "rna_ctxt", rna_ctxt.strinfo);
-  const int ret = WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, NULL);
+  const int ret = WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, nullptr);
 
   /* Clean up */
   if (but_label.strinfo) {
@@ -1736,7 +2037,7 @@ static int reloadtranslation_exec(bContext *UNUSED(C), wmOperator *UNUSED(op))
 {
   BLT_lang_init();
   BLF_cache_clear();
-  BLT_lang_set(NULL);
+  BLT_lang_set(nullptr);
   UI_reinit_font();
   return OPERATOR_FINISHED;
 }
@@ -1763,13 +2064,13 @@ static int ui_button_press_invoke(bContext *C, wmOperator *op, const wmEvent *ev
   bScreen *screen = CTX_wm_screen(C);
   const bool skip_depressed = RNA_boolean_get(op->ptr, "skip_depressed");
   ARegion *region_prev = CTX_wm_region(C);
-  ARegion *region = screen ? BKE_screen_find_region_xy(screen, RGN_TYPE_ANY, event->xy) : NULL;
+  ARegion *region = screen ? BKE_screen_find_region_xy(screen, RGN_TYPE_ANY, event->xy) : nullptr;
 
-  if (region == NULL) {
+  if (region == nullptr) {
     region = region_prev;
   }
 
-  if (region == NULL) {
+  if (region == nullptr) {
     return OPERATOR_PASS_THROUGH;
   }
 
@@ -1777,7 +2078,7 @@ static int ui_button_press_invoke(bContext *C, wmOperator *op, const wmEvent *ev
   uiBut *but = UI_context_active_but_get(C);
   CTX_wm_region_set(C, region_prev);
 
-  if (but == NULL) {
+  if (but == nullptr) {
     return OPERATOR_PASS_THROUGH;
   }
   if (skip_depressed && (but->flag & (UI_SELECT | UI_SELECT_DRAW))) {
@@ -1790,7 +2091,7 @@ static int ui_button_press_invoke(bContext *C, wmOperator *op, const wmEvent *ev
 
   UI_but_execute(C, region, but);
 
-  but->optype = but_optype;
+  but->optype = static_cast<wmOperatorType *>(but_optype);
 
   WM_event_add_mousemove(CTX_wm_window(C));
 
@@ -1806,7 +2107,7 @@ static void UI_OT_button_execute(wmOperatorType *ot)
   ot->invoke = ui_button_press_invoke;
   ot->flag = OPTYPE_INTERNAL;
 
-  RNA_def_boolean(ot->srna, "skip_depressed", 0, "Skip Depressed", "");
+  RNA_def_boolean(ot->srna, "skip_depressed", false, "Skip Depressed", "");
 }
 
 /** \} */
@@ -1852,21 +2153,21 @@ bool UI_drop_color_poll(struct bContext *C, wmDrag *drag, const wmEvent *UNUSED(
     ARegion *region = CTX_wm_region(C);
 
     if (UI_but_active_drop_color(C)) {
-      return 1;
+      return true;
     }
 
     if (sima && (sima->mode == SI_MODE_PAINT) && sima->image &&
         (region && region->regiontype == RGN_TYPE_WINDOW)) {
-      return 1;
+      return true;
     }
   }
 
-  return 0;
+  return false;
 }
 
 void UI_drop_color_copy(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 {
-  uiDragColorHandle *drag_info = drag->poin;
+  uiDragColorHandle *drag_info = static_cast<uiDragColorHandle *>(drag->poin);
 
   RNA_float_set_array(drop->ptr, "color", drag_info->color);
   RNA_boolean_set(drop->ptr, "gamma", drag_info->gamma_corrected);
@@ -1875,7 +2176,7 @@ void UI_drop_color_copy(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
 static int drop_color_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 {
   ARegion *region = CTX_wm_region(C);
-  uiBut *but = NULL;
+  uiBut *but = nullptr;
   float color[4];
   bool gamma;
 
@@ -1932,8 +2233,10 @@ static void UI_OT_drop_color(wmOperatorType *ot)
   ot->invoke = drop_color_invoke;
   ot->flag = OPTYPE_INTERNAL;
 
-  RNA_def_float_color(ot->srna, "color", 3, NULL, 0.0, FLT_MAX, "Color", "Source color", 0.0, 1.0);
-  RNA_def_boolean(ot->srna, "gamma", 0, "Gamma Corrected", "The source color is gamma corrected");
+  RNA_def_float_color(
+      ot->srna, "color", 3, nullptr, 0.0, FLT_MAX, "Color", "Source color", 0.0, 1.0);
+  RNA_def_boolean(
+      ot->srna, "gamma", false, "Gamma Corrected", "The source color is gamma corrected");
 }
 
 /** \} */
@@ -1963,7 +2266,7 @@ static bool drop_name_poll(bContext *C)
 static int drop_name_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
   uiBut *but = UI_but_active_drop_name_button(C);
-  char *str = RNA_string_get_alloc(op->ptr, "string", NULL, 0, NULL);
+  char *str = RNA_string_get_alloc(op->ptr, "string", nullptr, 0, nullptr);
 
   if (str) {
     ui_but_set_string_interactive(C, but, str);
@@ -1984,7 +2287,7 @@ static void UI_OT_drop_name(wmOperatorType *ot)
   ot->flag = OPTYPE_UNDO | OPTYPE_INTERNAL;
 
   RNA_def_string(
-      ot->srna, "string", NULL, 0, "String", "The string value to drop into the button");
+      ot->srna, "string", nullptr, 0, "String", "The string value to drop into the button");
 }
 
 /** \} */
@@ -2002,7 +2305,7 @@ static bool ui_list_focused_poll(bContext *C)
   const wmWindow *win = CTX_wm_window(C);
   const uiList *list = UI_list_find_mouse_over(region, win->eventstate);
 
-  return list != NULL;
+  return list != nullptr;
 }
 
 /**
@@ -2025,7 +2328,7 @@ static int ui_list_start_filter_invoke(bContext *C, wmOperator *UNUSED(op), cons
   ARegion *region = CTX_wm_region(C);
   uiList *list = UI_list_find_mouse_over(region, event);
   /* Poll should check. */
-  BLI_assert(list != NULL);
+  BLI_assert(list != nullptr);
 
   if (ui_list_unhide_filter_options(list)) {
     ui_region_redraw_immediately(C, region);
@@ -2054,40 +2357,43 @@ static void UI_OT_list_start_filter(wmOperatorType *ot)
 /** \name UI Tree-View Drop Operator
  * \{ */
 
-static bool ui_tree_view_drop_poll(bContext *C)
+static bool ui_view_drop_poll(bContext *C)
 {
   const wmWindow *win = CTX_wm_window(C);
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(
-      region, win->eventstate->xy);
+  if (region == nullptr) {
+    return false;
+  }
+  const uiViewItemHandle *hovered_item = UI_region_views_find_item_at(region, win->eventstate->xy);
 
-  return hovered_tree_item != NULL;
+  return hovered_item != nullptr;
 }
 
-static int ui_tree_view_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
+static int ui_view_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
 {
   if (event->custom != EVT_DATA_DRAGDROP) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
   const ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region, event->xy);
+  uiViewItemHandle *hovered_item = UI_region_views_find_item_at(region, event->xy);
 
-  if (!UI_tree_view_item_drop_handle(C, hovered_tree_item, event->customdata)) {
+  if (!UI_view_item_drop_handle(
+          C, hovered_item, static_cast<const ListBase *>(event->customdata))) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
   return OPERATOR_FINISHED;
 }
 
-static void UI_OT_tree_view_drop(wmOperatorType *ot)
+static void UI_OT_view_drop(wmOperatorType *ot)
 {
-  ot->name = "Tree View drop";
-  ot->idname = "UI_OT_tree_view_drop";
-  ot->description = "Drag and drop items onto a tree item";
+  ot->name = "View drop";
+  ot->idname = "UI_OT_view_drop";
+  ot->description = "Drag and drop items onto a data-set item";
 
-  ot->invoke = ui_tree_view_drop_invoke;
-  ot->poll = ui_tree_view_drop_poll;
+  ot->invoke = ui_view_drop_invoke;
+  ot->poll = ui_view_drop_poll;
 
   ot->flag = OPTYPE_INTERNAL;
 }
@@ -2095,43 +2401,45 @@ static void UI_OT_tree_view_drop(wmOperatorType *ot)
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name UI Tree-View Item Rename Operator
+/** \name UI View Item Rename Operator
  *
- * General purpose renaming operator for tree-views. Thanks to this, to add a rename button to
- * context menus for example, tree-view API users don't have to implement their own renaming
- * operators with the same logic as they already have for their #ui::AbstractTreeViewItem::rename()
- * override.
+ * General purpose renaming operator for views. Thanks to this, to add a rename button to context
+ * menus for example, view API users don't have to implement their own renaming operators with the
+ * same logic as they already have for their #ui::AbstractViewItem::rename() override.
  *
  * \{ */
 
-static bool ui_tree_view_item_rename_poll(bContext *C)
+static bool ui_view_item_rename_poll(bContext *C)
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *active_item = UI_block_tree_view_find_active_item(region);
-  return active_item != NULL && UI_tree_view_item_can_rename(active_item);
+  if (region == nullptr) {
+    return false;
+  }
+  const uiViewItemHandle *active_item = UI_region_views_find_active_item(region);
+  return active_item != nullptr && UI_view_item_can_rename(active_item);
 }
 
-static int ui_tree_view_item_rename_exec(bContext *C, wmOperator *UNUSED(op))
+static int ui_view_item_rename_exec(bContext *C, wmOperator *UNUSED(op))
 {
   ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *active_item = UI_block_tree_view_find_active_item(region);
+  uiViewItemHandle *active_item = UI_region_views_find_active_item(region);
 
-  UI_tree_view_item_begin_rename(active_item);
+  UI_view_item_begin_rename(active_item);
   ED_region_tag_redraw(region);
 
   return OPERATOR_FINISHED;
 }
 
-static void UI_OT_tree_view_item_rename(wmOperatorType *ot)
+static void UI_OT_view_item_rename(wmOperatorType *ot)
 {
-  ot->name = "Rename Tree-View Item";
-  ot->idname = "UI_OT_tree_view_item_rename";
-  ot->description = "Rename the active item in the tree";
+  ot->name = "Rename View Item";
+  ot->idname = "UI_OT_view_item_rename";
+  ot->description = "Rename the active item in the data-set view";
 
-  ot->exec = ui_tree_view_item_rename_exec;
-  ot->poll = ui_tree_view_item_rename_poll;
+  ot->exec = ui_view_item_rename_exec;
+  ot->poll = ui_view_item_rename_poll;
   /* Could get a custom tooltip via the `get_description()` callback and another overridable
-   * function of the tree-view. */
+   * function of the view. */
 
   ot->flag = OPTYPE_INTERNAL;
 }
@@ -2145,8 +2453,8 @@ static void UI_OT_tree_view_item_rename(wmOperatorType *ot)
 static bool ui_drop_material_poll(bContext *C)
 {
   PointerRNA ptr = CTX_data_pointer_get_type(C, "object", &RNA_Object);
-  Object *ob = ptr.data;
-  if (ob == NULL) {
+  const Object *ob = static_cast<const Object *>(ptr.data);
+  if (ob == nullptr) {
     return false;
   }
 
@@ -2164,12 +2472,12 @@ static int ui_drop_material_exec(bContext *C, wmOperator *op)
 
   Material *ma = (Material *)WM_operator_properties_id_lookup_from_name_or_session_uuid(
       bmain, op->ptr, ID_MA);
-  if (ma == NULL) {
+  if (ma == nullptr) {
     return OPERATOR_CANCELLED;
   }
 
   PointerRNA ptr = CTX_data_pointer_get_type(C, "object", &RNA_Object);
-  Object *ob = ptr.data;
+  Object *ob = static_cast<Object *>(ptr.data);
   BLI_assert(ob);
 
   PointerRNA mat_slot = CTX_data_pointer_get_type(C, "material_slot", &RNA_MaterialSlot);
@@ -2177,14 +2485,14 @@ static int ui_drop_material_exec(bContext *C, wmOperator *op)
   const int target_slot = RNA_int_get(&mat_slot, "slot_index") + 1;
 
   /* only drop grease pencil material on grease pencil objects */
-  if ((ma->gp_style != NULL) && (ob->type != OB_GPENCIL)) {
+  if ((ma->gp_style != nullptr) && (ob->type != OB_GPENCIL)) {
     return OPERATOR_CANCELLED;
   }
 
   BKE_object_material_assign(bmain, ob, ma, target_slot, BKE_MAT_ASSIGN_USERPREF);
 
   WM_event_add_notifier(C, NC_OBJECT | ND_OB_SHADING, ob);
-  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, NULL);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
   WM_event_add_notifier(C, NC_MATERIAL | ND_SHADING_LINKS, ma);
   DEG_id_tag_update(&ob->id, ID_RECALC_TRANSFORM);
 
@@ -2218,8 +2526,6 @@ void ED_operatortypes_ui(void)
   WM_operatortype_append(UI_OT_reset_default_button);
   WM_operatortype_append(UI_OT_assign_default_button);
   WM_operatortype_append(UI_OT_unset_property_button);
-  WM_operatortype_append(UI_OT_override_type_set_button);
-  WM_operatortype_append(UI_OT_override_remove_button);
   WM_operatortype_append(UI_OT_copy_to_selected_button);
   WM_operatortype_append(UI_OT_jump_to_target_button);
   WM_operatortype_append(UI_OT_drop_color);
@@ -2235,8 +2541,15 @@ void ED_operatortypes_ui(void)
 
   WM_operatortype_append(UI_OT_list_start_filter);
 
-  WM_operatortype_append(UI_OT_tree_view_drop);
-  WM_operatortype_append(UI_OT_tree_view_item_rename);
+  WM_operatortype_append(UI_OT_view_drop);
+  WM_operatortype_append(UI_OT_view_item_rename);
+
+  WM_operatortype_append(UI_OT_override_type_set_button);
+  WM_operatortype_append(UI_OT_override_remove_button);
+  WM_operatortype_append(UI_OT_override_idtemplate_make);
+  WM_operatortype_append(UI_OT_override_idtemplate_reset);
+  WM_operatortype_append(UI_OT_override_idtemplate_clear);
+  override_idtemplate_menu();
 
   /* external */
   WM_operatortype_append(UI_OT_eyedropper_color);
diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.cc
index 87bfb7ca0f7..745a2201dc1 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.cc
@@ -8,10 +8,10 @@
 /* a full doc with API notes can be found in
  * bf-blender/trunk/blender/doc/guides/interface_API.txt */
 
-#include <ctype.h>
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cctype>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
 
 #include "MEM_guardedalloc.h"
 
@@ -57,7 +57,7 @@
 #define ANIMATION_TIME 0.30
 #define ANIMATION_INTERVAL 0.02
 
-typedef enum uiPanelRuntimeFlag {
+enum uiPanelRuntimeFlag {
   PANEL_LAST_ADDED = (1 << 0),
   PANEL_ACTIVE = (1 << 2),
   PANEL_WAS_ACTIVE = (1 << 3),
@@ -78,22 +78,22 @@ typedef enum uiPanelRuntimeFlag {
   PANEL_IS_DRAG_DROP = (1 << 10),
   /** Draw a border with the active color around the panel. */
   PANEL_ACTIVE_BORDER = (1 << 11),
-} uiPanelRuntimeFlag;
+};
 
 /* The state of the mouse position relative to the panel. */
-typedef enum uiPanelMouseState {
+enum uiPanelMouseState {
   PANEL_MOUSE_OUTSIDE,        /** Mouse is not in the panel. */
   PANEL_MOUSE_INSIDE_CONTENT, /** Mouse is in the actual panel content. */
   PANEL_MOUSE_INSIDE_HEADER,  /** Mouse is in the panel header. */
-} uiPanelMouseState;
+};
 
-typedef enum uiHandlePanelState {
+enum uiHandlePanelState {
   PANEL_STATE_DRAG,
   PANEL_STATE_ANIMATION,
   PANEL_STATE_EXIT,
-} uiHandlePanelState;
+};
 
-typedef struct uiHandlePanelData {
+struct uiHandlePanelData {
   uiHandlePanelState state;
 
   /* Animation. */
@@ -104,17 +104,17 @@ typedef struct uiHandlePanelData {
   int startx, starty;
   int startofsx, startofsy;
   float start_cur_xmin, start_cur_ymin;
-} uiHandlePanelData;
+};
 
-typedef struct PanelSort {
+struct PanelSort {
   Panel *panel;
   int new_offset_x;
   int new_offset_y;
-} PanelSort;
+};
 
 static void panel_set_expansion_from_list_data(const bContext *C, Panel *panel);
 static int get_panel_real_size_y(const Panel *panel);
-static void panel_activate_state(const bContext *C, Panel *panel, uiHandlePanelState state);
+static void panel_activate_state(const bContext *C, Panel *panel, const uiHandlePanelState state);
 static int compare_panel(const void *a, const void *b);
 static bool panel_type_context_poll(ARegion *region,
                                     const PanelType *panel_type,
@@ -155,7 +155,7 @@ static bool panel_active_animation_changed(ListBase *lb,
 
     /* Detect animation. */
     if (panel->activedata) {
-      uiHandlePanelData *data = panel->activedata;
+      uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
       if (data->state == PANEL_STATE_ANIMATION) {
         *r_panel_animation = panel;
       }
@@ -178,7 +178,7 @@ static bool panel_active_animation_changed(ListBase *lb,
 static bool properties_space_needs_realign(const ScrArea *area, const ARegion *region)
 {
   if (area->spacetype == SPACE_PROPERTIES && region->regiontype == RGN_TYPE_WINDOW) {
-    SpaceProperties *sbuts = area->spacedata.first;
+    const SpaceProperties *sbuts = static_cast<SpaceProperties *>(area->spacedata.first);
 
     if (sbuts->mainbo != sbuts->mainb) {
       return true;
@@ -190,14 +190,14 @@ static bool properties_space_needs_realign(const ScrArea *area, const ARegion *r
 
 static bool panels_need_realign(const ScrArea *area, ARegion *region, Panel **r_panel_animation)
 {
-  *r_panel_animation = NULL;
+  *r_panel_animation = nullptr;
 
   if (properties_space_needs_realign(area, region)) {
     return true;
   }
 
   /* Detect if a panel was added or removed. */
-  Panel *panel_animation = NULL;
+  Panel *panel_animation = nullptr;
   bool no_animation = false;
   if (panel_active_animation_changed(&region->panels, &panel_animation, &no_animation)) {
     return true;
@@ -225,7 +225,7 @@ static Panel *panel_add_instanced(ARegion *region,
                                   PanelType *panel_type,
                                   PointerRNA *custom_data)
 {
-  Panel *panel = MEM_callocN(sizeof(Panel), __func__);
+  Panel *panel = MEM_cnew<Panel>(__func__);
   panel->type = panel_type;
   BLI_strncpy(panel->panelname, panel_type->idname, sizeof(panel->panelname));
 
@@ -235,7 +235,7 @@ static Panel *panel_add_instanced(ARegion *region,
   /* Add the panel's children too. Although they aren't instanced panels, we can still use this
    * function to create them, as UI_panel_begin does other things we don't need to do. */
   LISTBASE_FOREACH (LinkData *, child, &panel_type->children) {
-    PanelType *child_type = child->data;
+    PanelType *child_type = static_cast<PanelType *>(child->data);
     panel_add_instanced(region, &panel->children, child_type, custom_data);
   }
 
@@ -265,12 +265,12 @@ Panel *UI_panel_add_instanced(const bContext *C,
 {
   ARegionType *region_type = region->type;
 
-  PanelType *panel_type = BLI_findstring(
-      &region_type->paneltypes, panel_idname, offsetof(PanelType, idname));
+  PanelType *panel_type = static_cast<PanelType *>(
+      BLI_findstring(&region_type->paneltypes, panel_idname, offsetof(PanelType, idname)));
 
-  if (panel_type == NULL) {
+  if (panel_type == nullptr) {
     printf("Panel type '%s' not found.\n", panel_idname);
-    return NULL;
+    return nullptr;
   }
 
   Panel *new_panel = panel_add_instanced(region, panels, panel_type, custom_data);
@@ -314,14 +314,14 @@ void UI_panels_free_instanced(const bContext *C, ARegion *region)
 {
   /* Delete panels with the instanced flag. */
   LISTBASE_FOREACH_MUTABLE (Panel *, panel, &region->panels) {
-    if ((panel->type != NULL) && (panel->type->flag & PANEL_TYPE_INSTANCED)) {
+    if ((panel->type != nullptr) && (panel->type->flag & PANEL_TYPE_INSTANCED)) {
       /* Make sure the panel's handler is removed before deleting it. */
-      if (C != NULL && panel->activedata != NULL) {
+      if (C != nullptr && panel->activedata != nullptr) {
         panel_activate_state(C, panel, PANEL_STATE_EXIT);
       }
 
       /* Free panel's custom data. */
-      if (panel->runtime.custom_data_ptr != NULL) {
+      if (panel->runtime.custom_data_ptr != nullptr) {
         MEM_freeN(panel->runtime.custom_data_ptr);
       }
 
@@ -335,28 +335,28 @@ bool UI_panel_list_matches_data(ARegion *region,
                                 ListBase *data,
                                 uiListPanelIDFromDataFunc panel_idname_func)
 {
-  /* Check for NULL data. */
+  /* Check for nullptr data. */
   int data_len = 0;
-  Link *data_link = NULL;
-  if (data == NULL) {
+  Link *data_link = nullptr;
+  if (data == nullptr) {
     data_len = 0;
-    data_link = NULL;
+    data_link = nullptr;
   }
   else {
     data_len = BLI_listbase_count(data);
-    data_link = data->first;
+    data_link = static_cast<Link *>(data->first);
   }
 
   int i = 0;
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
-    if (panel->type != NULL && panel->type->flag & PANEL_TYPE_INSTANCED) {
+    if (panel->type != nullptr && panel->type->flag & PANEL_TYPE_INSTANCED) {
       /* The panels were reordered by drag and drop. */
       if (panel->flag & PNL_INSTANCED_LIST_ORDER_CHANGED) {
         return false;
       }
 
       /* We reached the last data item before the last instanced panel. */
-      if (data_link == NULL) {
+      if (data_link == nullptr) {
         return false;
       }
 
@@ -383,15 +383,15 @@ bool UI_panel_list_matches_data(ARegion *region,
 static void reorder_instanced_panel_list(bContext *C, ARegion *region, Panel *drag_panel)
 {
   /* Without a type we cannot access the reorder callback. */
-  if (drag_panel->type == NULL) {
+  if (drag_panel->type == nullptr) {
     return;
   }
   /* Don't reorder if this instanced panel doesn't support drag and drop reordering. */
-  if (drag_panel->type->reorder == NULL) {
+  if (drag_panel->type->reorder == nullptr) {
     return;
   }
 
-  char *context = NULL;
+  char *context = nullptr;
   if (!UI_panel_category_is_visible(region)) {
     context = drag_panel->type->context;
   }
@@ -415,7 +415,8 @@ static void reorder_instanced_panel_list(bContext *C, ARegion *region, Panel *dr
   BLI_assert(start_index != -1); /* The drag panel should definitely be in the list. */
 
   /* Sort the matching instanced panels by their display order. */
-  PanelSort *panel_sort = MEM_callocN(list_panels_len * sizeof(*panel_sort), __func__);
+  PanelSort *panel_sort = static_cast<PanelSort *>(
+      MEM_callocN(list_panels_len * sizeof(*panel_sort), __func__));
   PanelSort *sort_index = panel_sort;
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     if (panel->type) {
@@ -452,7 +453,7 @@ static void reorder_instanced_panel_list(bContext *C, ARegion *region, Panel *dr
   /* Finally, move this panel's list item to the new index in its list. */
   drag_panel->type->reorder(C, drag_panel, move_to_index);
 
-  CTX_store_set(C, NULL);
+  CTX_store_set(C, nullptr);
 }
 
 /**
@@ -480,9 +481,9 @@ static bool panel_set_expand_from_list_data_recursive(Panel *panel, short flag,
  */
 static void panel_set_expansion_from_list_data(const bContext *C, Panel *panel)
 {
-  BLI_assert(panel->type != NULL);
+  BLI_assert(panel->type != nullptr);
   BLI_assert(panel->type->flag & PANEL_TYPE_INSTANCED);
-  if (panel->type->get_list_data_expand_flag == NULL) {
+  if (panel->type->get_list_data_expand_flag == nullptr) {
     /* Instanced panel doesn't support loading expansion. */
     return;
   }
@@ -504,7 +505,7 @@ static void region_panels_set_expansion_from_list_data(const bContext *C, ARegio
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     if (panel->runtime_flag & PANEL_ACTIVE) {
       PanelType *panel_type = panel->type;
-      if (panel_type != NULL && panel->type->flag & PANEL_TYPE_INSTANCED) {
+      if (panel_type != nullptr && panel->type->flag & PANEL_TYPE_INSTANCED) {
         panel_set_expansion_from_list_data(C, panel);
       }
     }
@@ -537,7 +538,7 @@ static void set_panels_list_data_expand_flag(const bContext *C, const ARegion *r
 {
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     PanelType *panel_type = panel->type;
-    if (panel_type == NULL) {
+    if (panel_type == nullptr) {
       continue;
     }
 
@@ -563,11 +564,11 @@ static bool panel_custom_data_active_get(const Panel *panel)
 {
   /* The caller should make sure the panel is active and has a type. */
   BLI_assert(UI_panel_is_active(panel));
-  BLI_assert(panel->type != NULL);
+  BLI_assert(panel->type != nullptr);
 
   if (panel->type->active_property[0] != '\0') {
     PointerRNA *ptr = UI_panel_custom_data_get(panel);
-    if (ptr != NULL && !RNA_pointer_is_null(ptr)) {
+    if (ptr != nullptr && !RNA_pointer_is_null(ptr)) {
       return RNA_boolean_get(ptr, panel->type->active_property);
     }
   }
@@ -579,12 +580,12 @@ static void panel_custom_data_active_set(Panel *panel)
 {
   /* Since the panel is interacted with, it should be active and have a type. */
   BLI_assert(UI_panel_is_active(panel));
-  BLI_assert(panel->type != NULL);
+  BLI_assert(panel->type != nullptr);
 
   if (panel->type->active_property[0] != '\0') {
     PointerRNA *ptr = UI_panel_custom_data_get(panel);
-    BLI_assert(RNA_struct_find_property(ptr, panel->type->active_property) != NULL);
-    if (ptr != NULL && !RNA_pointer_is_null(ptr)) {
+    BLI_assert(RNA_struct_find_property(ptr, panel->type->active_property) != nullptr);
+    if (ptr != nullptr && !RNA_pointer_is_null(ptr)) {
       RNA_boolean_set(ptr, panel->type->active_property, true);
     }
   }
@@ -617,7 +618,7 @@ static void panel_set_runtime_flag_recursive(Panel *panel, short flag, bool valu
 static void panels_collapse_all(ARegion *region, const Panel *from_panel)
 {
   const bool has_category_tabs = UI_panel_category_is_visible(region);
-  const char *category = has_category_tabs ? UI_panel_category_active_get(region, false) : NULL;
+  const char *category = has_category_tabs ? UI_panel_category_active_get(region, false) : nullptr;
   const PanelType *from_pt = from_panel->type;
 
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
@@ -659,7 +660,7 @@ Panel *UI_panel_find_by_type(ListBase *lb, const PanelType *pt)
       return panel;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 Panel *UI_panel_begin(
@@ -668,10 +669,10 @@ Panel *UI_panel_begin(
   Panel *panel_last;
   const char *drawname = CTX_IFACE_(pt->translation_context, pt->label);
   const char *idname = pt->idname;
-  const bool newpanel = (panel == NULL);
+  const bool newpanel = (panel == nullptr);
 
   if (newpanel) {
-    panel = MEM_callocN(sizeof(Panel), __func__);
+    panel = MEM_cnew<Panel>(__func__);
     panel->type = pt;
     BLI_strncpy(panel->panelname, idname, sizeof(panel->panelname));
 
@@ -701,7 +702,7 @@ Panel *UI_panel_begin(
 
   /* If a new panel is added, we insert it right after the panel that was last added.
    * This way new panels are inserted in the right place between versions. */
-  for (panel_last = lb->first; panel_last; panel_last = panel_last->next) {
+  for (panel_last = static_cast<Panel *>(lb->first); panel_last; panel_last = panel_last->next) {
     if (panel_last->runtime_flag & PANEL_LAST_ADDED) {
       BLI_remlink(lb, panel);
       BLI_insertlinkafter(lb, panel_last, panel);
@@ -755,7 +756,7 @@ void UI_panel_header_buttons_end(Panel *panel)
   /* A button group should always be created in #UI_panel_header_buttons_begin. */
   BLI_assert(!BLI_listbase_is_empty(&block->button_groups));
 
-  uiButtonGroup *button_group = block->button_groups.last;
+  uiButtonGroup *button_group = static_cast<uiButtonGroup *>(block->button_groups.last);
 
   button_group->flag &= ~UI_BUTTON_GROUP_LOCK;
 
@@ -770,7 +771,7 @@ void UI_panel_header_buttons_end(Panel *panel)
     /* Always add a new button group. Although this may result in many empty groups, without it,
      * new buttons in the panel body not protected with a #ui_block_new_button_group call would
      * end up in the panel header group. */
-    ui_block_new_button_group(block, 0);
+    ui_block_new_button_group(block, (uiButtonGroupFlag)0);
   }
 }
 
@@ -867,7 +868,7 @@ void ui_panel_tag_search_filter_match(Panel *panel)
 
 static void panel_matches_search_filter_recursive(const Panel *panel, bool *filter_matches)
 {
-  *filter_matches |= panel->runtime_flag & PANEL_SEARCH_FILTER_MATCH;
+  *filter_matches |= bool(panel->runtime_flag & PANEL_SEARCH_FILTER_MATCH);
 
   /* If the panel has no match we need to make sure that its children are too. */
   if (!*filter_matches) {
@@ -893,7 +894,7 @@ static void panel_set_expansion_from_search_filter_recursive(const bContext *C,
 {
   /* This has to run on inactive panels that may not have a type,
    * but we can prevent running on header-less panels in some cases. */
-  if (panel->type == NULL || !(panel->type->flag & PANEL_TYPE_NO_HEADER)) {
+  if (panel->type == nullptr || !(panel->type->flag & PANEL_TYPE_NO_HEADER)) {
     SET_FLAG_FROM_TEST(panel->runtime_flag, use_search_closed, PANEL_USE_CLOSED_FROM_SEARCH);
   }
 
@@ -926,9 +927,9 @@ static void region_panels_set_expansion_from_search_filter(const bContext *C,
 static void panel_remove_invisible_layouts_recursive(Panel *panel, const Panel *parent_panel)
 {
   uiBlock *block = panel->runtime.block;
-  BLI_assert(block != NULL);
+  BLI_assert(block != nullptr);
   BLI_assert(block->active);
-  if (parent_panel != NULL && UI_panel_is_closed(parent_panel)) {
+  if (parent_panel != nullptr && UI_panel_is_closed(parent_panel)) {
     /* The parent panel is closed, so this panel can be completely removed. */
     UI_block_set_search_only(block, true);
     LISTBASE_FOREACH (uiBut *, but, &block->buttons) {
@@ -944,7 +945,7 @@ static void panel_remove_invisible_layouts_recursive(Panel *panel, const Panel *
         continue;
       }
       LISTBASE_FOREACH (LinkData *, link, &button_group->buttons) {
-        uiBut *but = link->data;
+        uiBut *but = static_cast<uiBut *>(link->data);
         but->flag |= UI_HIDDEN;
       }
     }
@@ -952,7 +953,7 @@ static void panel_remove_invisible_layouts_recursive(Panel *panel, const Panel *
 
   LISTBASE_FOREACH (Panel *, child_panel, &panel->children) {
     if (child_panel->runtime_flag & PANEL_ACTIVE) {
-      BLI_assert(child_panel->runtime.block != NULL);
+      BLI_assert(child_panel->runtime.block != nullptr);
       panel_remove_invisible_layouts_recursive(child_panel, panel);
     }
   }
@@ -962,8 +963,8 @@ static void region_panels_remove_invisible_layouts(ARegion *region)
 {
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     if (panel->runtime_flag & PANEL_ACTIVE) {
-      BLI_assert(panel->runtime.block != NULL);
-      panel_remove_invisible_layouts_recursive(panel, NULL);
+      BLI_assert(panel->runtime.block != nullptr);
+      panel_remove_invisible_layouts_recursive(panel, nullptr);
     }
   }
 }
@@ -1054,7 +1055,7 @@ static void panel_draw_highlight_border(const Panel *panel,
                                         const rcti *rect,
                                         const rcti *header_rect)
 {
-  const bool is_subpanel = panel->type->parent != NULL;
+  const bool is_subpanel = panel->type->parent != nullptr;
   if (is_subpanel) {
     return;
   }
@@ -1064,18 +1065,15 @@ static void panel_draw_highlight_border(const Panel *panel,
   const float radius = (btheme->tui.panel_roundness * U.widget_unit * 0.5f) / aspect;
   UI_draw_roundbox_corner_set(UI_CNR_ALL);
 
+  rctf box_rect;
+  box_rect.xmin = rect->xmin;
+  box_rect.xmax = rect->xmax;
+  box_rect.ymin = UI_panel_is_closed(panel) ? header_rect->ymin : rect->ymin;
+  box_rect.ymax = header_rect->ymax;
+
   float color[4];
   UI_GetThemeColor4fv(TH_SELECT_ACTIVE, color);
-  UI_draw_roundbox_4fv(
-      &(const rctf){
-          .xmin = rect->xmin,
-          .xmax = rect->xmax,
-          .ymin = UI_panel_is_closed(panel) ? header_rect->ymin : rect->ymin,
-          .ymax = header_rect->ymax,
-      },
-      false,
-      radius,
-      color);
+  UI_draw_roundbox_4fv(&box_rect, false, radius, color);
 }
 
 static void panel_draw_aligned_widgets(const uiStyle *style,
@@ -1086,19 +1084,18 @@ static void panel_draw_aligned_widgets(const uiStyle *style,
                                        const bool show_background,
                                        const bool region_search_filter_active)
 {
-  const bool is_subpanel = panel->type->parent != NULL;
+  const bool is_subpanel = panel->type->parent != nullptr;
   const uiFontStyle *fontstyle = (is_subpanel) ? &style->widgetlabel : &style->paneltitle;
 
   const int header_height = BLI_rcti_size_y(header_rect);
   const int scaled_unit = round_fl_to_int(UI_UNIT_X / aspect);
 
-  /* Offset triangle and text to the right for subpanels. */
-  const rcti widget_rect = {
-      .xmin = header_rect->xmin + (is_subpanel ? scaled_unit * 0.7f : 0),
-      .xmax = header_rect->xmax,
-      .ymin = header_rect->ymin,
-      .ymax = header_rect->ymax,
-  };
+  /* Offset triangle and text to the right for sub-panels. */
+  rcti widget_rect;
+  widget_rect.xmin = header_rect->xmin + (is_subpanel ? scaled_unit * 0.7f : 0);
+  widget_rect.xmax = header_rect->xmax;
+  widget_rect.ymin = header_rect->ymin;
+  widget_rect.ymax = header_rect->ymax;
 
   uchar title_color[4];
   panel_title_color_get(panel, show_background, region_search_filter_active, title_color);
@@ -1121,20 +1118,16 @@ static void panel_draw_aligned_widgets(const uiStyle *style,
 
   /* Draw text label. */
   if (panel->drawname[0] != '\0') {
-    const rcti title_rect = {
-        .xmin = widget_rect.xmin + (panel->labelofs / aspect) + scaled_unit * 1.1f,
-        .xmax = widget_rect.xmax,
-        .ymin = widget_rect.ymin - 2.0f / aspect,
-        .ymax = widget_rect.ymax,
-    };
-    UI_fontstyle_draw(fontstyle,
-                      &title_rect,
-                      panel->drawname,
-                      sizeof(panel->drawname),
-                      title_color,
-                      &(struct uiFontStyleDraw_Params){
-                          .align = UI_STYLE_TEXT_LEFT,
-                      });
+    rcti title_rect;
+    title_rect.xmin = widget_rect.xmin + (panel->labelofs / aspect) + scaled_unit * 1.1f;
+    title_rect.xmax = widget_rect.xmax;
+    title_rect.ymin = widget_rect.ymin - 2.0f / aspect;
+    title_rect.ymax = widget_rect.ymax;
+
+    uiFontStyleDraw_Params params{};
+    params.align = UI_STYLE_TEXT_LEFT;
+    UI_fontstyle_draw(
+        fontstyle, &title_rect, panel->drawname, sizeof(panel->drawname), title_color, &params);
   }
 
   /* Draw the pin icon. */
@@ -1167,7 +1160,7 @@ static void panel_draw_aligned_widgets(const uiStyle *style,
 
     GPUBatch *batch = GPU_batch_preset_panel_drag_widget(
         U.pixelsize, color_high, color_dark, drag_widget_size);
-    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_FLAT_COLOR);
+    GPU_batch_program_set_builtin(batch, GPU_SHADER_3D_FLAT_COLOR);
     GPU_batch_draw(batch);
     GPU_matrix_pop();
   }
@@ -1177,7 +1170,7 @@ static void panel_draw_aligned_backdrop(const Panel *panel,
                                         const rcti *rect,
                                         const rcti *header_rect)
 {
-  const bool is_subpanel = panel->type->parent != NULL;
+  const bool is_subpanel = panel->type->parent != nullptr;
   const bool is_open = !UI_panel_is_closed(panel);
 
   if (is_subpanel && !is_open) {
@@ -1188,7 +1181,7 @@ static void panel_draw_aligned_backdrop(const Panel *panel,
   const float aspect = panel->runtime.block->aspect;
   const float radius = btheme->tui.panel_roundness * U.widget_unit * 0.5f / aspect;
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_blend(GPU_BLEND_ALPHA);
 
   /* Panel backdrop. */
@@ -1197,16 +1190,12 @@ static void panel_draw_aligned_backdrop(const Panel *panel,
     UI_draw_roundbox_corner_set(is_open ? UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT : UI_CNR_ALL);
     UI_GetThemeColor4fv((is_subpanel ? TH_PANEL_SUB_BACK : TH_PANEL_BACK), panel_backcolor);
 
-    UI_draw_roundbox_4fv(
-        &(const rctf){
-            .xmin = rect->xmin,
-            .xmax = rect->xmax,
-            .ymin = rect->ymin,
-            .ymax = rect->ymax,
-        },
-        true,
-        radius,
-        panel_backcolor);
+    rctf box_rect;
+    box_rect.xmin = rect->xmin;
+    box_rect.xmax = rect->xmax;
+    box_rect.ymin = rect->ymin;
+    box_rect.ymax = rect->ymax;
+    UI_draw_roundbox_4fv(&box_rect, true, radius, panel_backcolor);
   }
 
   /* Panel header backdrops for non sub-panels. */
@@ -1217,16 +1206,12 @@ static void panel_draw_aligned_backdrop(const Panel *panel,
     UI_draw_roundbox_corner_set(is_open ? UI_CNR_TOP_RIGHT | UI_CNR_TOP_LEFT : UI_CNR_ALL);
 
     /* Change the width a little bit to line up with the sides. */
-    UI_draw_roundbox_4fv(
-        &(const rctf){
-            .xmin = rect->xmin,
-            .xmax = rect->xmax,
-            .ymin = header_rect->ymin,
-            .ymax = header_rect->ymax,
-        },
-        true,
-        radius,
-        panel_headercolor);
+    rctf box_rect;
+    box_rect.xmin = rect->xmin;
+    box_rect.xmax = rect->xmax;
+    box_rect.ymin = header_rect->ymin;
+    box_rect.ymax = header_rect->ymax;
+    UI_draw_roundbox_4fv(&box_rect, true, radius, panel_headercolor);
   }
 
   GPU_blend(GPU_BLEND_NONE);
@@ -1247,7 +1232,7 @@ void ui_draw_aligned_panel(const uiStyle *style,
       rect->xmin,
       rect->xmax,
       rect->ymax,
-      rect->ymax + floor(PNL_HEADER / block->aspect + 0.001f),
+      rect->ymax + (int)floor(PNL_HEADER / block->aspect + 0.001f),
   };
 
   if (show_background) {
@@ -1300,7 +1285,7 @@ bool UI_panel_should_show_background(const ARegion *region, const PanelType *pan
 void UI_panel_category_draw_all(ARegion *region, const char *category_id_active)
 {
   // #define USE_FLAT_INACTIVE
-  const bool is_left = RGN_ALIGN_ENUM_FROM_MASK(region->alignment != RGN_ALIGN_RIGHT);
+  const bool is_left = RGN_ALIGN_ENUM_FROM_MASK(region->alignment) != RGN_ALIGN_RIGHT;
   View2D *v2d = &region->v2d;
   const uiStyle *style = UI_style_get();
   const uiFontStyle *fstyle = &style->widget;
@@ -1399,7 +1384,7 @@ void UI_panel_category_draw_all(ARegion *region, const char *category_id_active)
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw the background. */
   if (is_alpha) {
@@ -1444,7 +1429,7 @@ void UI_panel_category_draw_all(ARegion *region, const char *category_id_active)
     if (is_active == false && is_active_prev == false && pc_dyn->prev) {
       pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       immUniformColor3fvAlpha(theme_col_tab_outline, 0.3f);
       immRecti(pos,
                is_left ? v2d->mask.xmin + (category_tabs_width / 5) :
@@ -1463,31 +1448,22 @@ void UI_panel_category_draw_all(ARegion *region, const char *category_id_active)
     {
       /* Draw filled rectangle and outline for tab. */
       UI_draw_roundbox_corner_set(roundboxtype);
-      UI_draw_roundbox_4fv(
-          &(const rctf){
-              .xmin = rct->xmin,
-              .xmax = rct->xmax,
-              .ymin = rct->ymin,
-              .ymax = rct->ymax,
-          },
-          true,
-          tab_curve_radius,
-          is_active ? theme_col_tab_active : theme_col_tab_inactive);
-      UI_draw_roundbox_4fv(
-          &(const rctf){
-              .xmin = rct->xmin,
-              .xmax = rct->xmax,
-              .ymin = rct->ymin,
-              .ymax = rct->ymax,
-          },
-          false,
-          tab_curve_radius,
-          theme_col_tab_outline);
+      rctf box_rect;
+      box_rect.xmin = rct->xmin;
+      box_rect.xmax = rct->xmax;
+      box_rect.ymin = rct->ymin;
+      box_rect.ymax = rct->ymax;
+
+      UI_draw_roundbox_4fv(&box_rect,
+                           true,
+                           tab_curve_radius,
+                           is_active ? theme_col_tab_active : theme_col_tab_inactive);
+      UI_draw_roundbox_4fv(&box_rect, false, tab_curve_radius, theme_col_tab_outline);
 
       /* Disguise the outline on one side to join the tab to the panel. */
       pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       immUniformColor4fv(is_active ? theme_col_tab_active : theme_col_tab_inactive);
       immRecti(pos,
@@ -1502,7 +1478,7 @@ void UI_panel_category_draw_all(ARegion *region, const char *category_id_active)
 
     if (do_scaletabs) {
       category_draw_len = BLF_width_to_strlen(
-          fontid, category_id_draw, category_draw_len, category_width, NULL);
+          fontid, category_id_draw, category_draw_len, category_width, nullptr);
     }
 
     BLF_position(fontid, rct->xmax - text_v_ofs, rct->ymin + tab_v_pad_text, 0.0f);
@@ -1660,7 +1636,7 @@ static bool uiAlignPanelStep(ARegion *region, const float factor, const bool dra
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     if (panel->runtime_flag & PANEL_ACTIVE) {
       /* These panels should have types since they are currently displayed to the user. */
-      BLI_assert(panel->type != NULL);
+      BLI_assert(panel->type != nullptr);
       active_panels_len++;
     }
   }
@@ -1669,7 +1645,8 @@ static bool uiAlignPanelStep(ARegion *region, const float factor, const bool dra
   }
 
   /* Sort panels. */
-  PanelSort *panel_sort = MEM_mallocN(sizeof(PanelSort) * active_panels_len, __func__);
+  PanelSort *panel_sort = static_cast<PanelSort *>(
+      MEM_mallocN(sizeof(PanelSort) * active_panels_len, __func__));
   {
     PanelSort *ps = panel_sort;
     LISTBASE_FOREACH (Panel *, panel, &region->panels) {
@@ -1791,7 +1768,7 @@ static void ui_panels_size(ARegion *region, int *r_x, int *r_y)
 
 static void ui_do_animate(bContext *C, Panel *panel)
 {
-  uiHandlePanelData *data = panel->activedata;
+  uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
   ARegion *region = CTX_wm_region(C);
 
   float fac = (PIL_check_seconds_timer() - data->starttime) / ANIMATION_TIME;
@@ -1856,7 +1833,7 @@ void UI_panels_end(const bContext *C, ARegion *region, int *r_x, int *r_y)
 
   LISTBASE_FOREACH (Panel *, panel, &region->panels) {
     if (panel->runtime_flag & PANEL_ACTIVE) {
-      BLI_assert(panel->runtime.block != NULL);
+      BLI_assert(panel->runtime.block != nullptr);
       panel_calculate_size_recursive(region, panel);
     }
   }
@@ -1892,7 +1869,7 @@ void UI_panels_end(const bContext *C, ARegion *region, int *r_x, int *r_y)
 #define DRAG_REGION_PAD (PNL_HEADER * 0.5)
 static void ui_do_drag(const bContext *C, const wmEvent *event, Panel *panel)
 {
-  uiHandlePanelData *data = panel->activedata;
+  uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
   ARegion *region = CTX_wm_region(C);
 
   /* Keep the drag position in the region with a small pad to keep the panel visible. */
@@ -1942,14 +1919,14 @@ static uiPanelMouseState ui_panel_mouse_state_get(const uiBlock *block,
   return PANEL_MOUSE_OUTSIDE;
 }
 
-typedef struct uiPanelDragCollapseHandle {
+struct uiPanelDragCollapseHandle {
   bool was_first_open;
   int xy_init[2];
-} uiPanelDragCollapseHandle;
+};
 
 static void ui_panel_drag_collapse_handler_remove(bContext *UNUSED(C), void *userdata)
 {
-  uiPanelDragCollapseHandle *dragcol_data = userdata;
+  uiPanelDragCollapseHandle *dragcol_data = static_cast<uiPanelDragCollapseHandle *>(userdata);
   MEM_freeN(dragcol_data);
 }
 
@@ -1960,11 +1937,11 @@ static void ui_panel_drag_collapse(const bContext *C,
   ARegion *region = CTX_wm_region(C);
 
   LISTBASE_FOREACH (uiBlock *, block, &region->uiblocks) {
-    float xy_a_block[2] = {UNPACK2(dragcol_data->xy_init)};
-    float xy_b_block[2] = {UNPACK2(xy_dst)};
+    float xy_a_block[2] = {(float)dragcol_data->xy_init[0], (float)dragcol_data->xy_init[1]};
+    float xy_b_block[2] = {(float)xy_dst[0], (float)xy_dst[1]};
     Panel *panel = block->panel;
 
-    if (panel == NULL || (panel->type && (panel->type->flag & PANEL_TYPE_NO_HEADER))) {
+    if (panel == nullptr || (panel->type && (panel->type->flag & PANEL_TYPE_NO_HEADER))) {
       continue;
     }
     const int oldflag = panel->flag;
@@ -2006,7 +1983,7 @@ static void ui_panel_drag_collapse(const bContext *C,
 static int ui_panel_drag_collapse_handler(bContext *C, const wmEvent *event, void *userdata)
 {
   wmWindow *win = CTX_wm_window(C);
-  uiPanelDragCollapseHandle *dragcol_data = userdata;
+  uiPanelDragCollapseHandle *dragcol_data = static_cast<uiPanelDragCollapseHandle *>(userdata);
   short retval = WM_UI_HANDLER_CONTINUE;
 
   switch (event->type) {
@@ -2037,7 +2014,7 @@ static void ui_panel_drag_collapse_handler_add(const bContext *C, const bool was
 {
   wmWindow *win = CTX_wm_window(C);
   const wmEvent *event = win->eventstate;
-  uiPanelDragCollapseHandle *dragcol_data = MEM_mallocN(sizeof(*dragcol_data), __func__);
+  uiPanelDragCollapseHandle *dragcol_data = MEM_new<uiPanelDragCollapseHandle>(__func__);
 
   dragcol_data->was_first_open = was_open;
   copy_v2_v2_int(dragcol_data->xy_init, event->xy);
@@ -2066,10 +2043,10 @@ static void ui_handle_panel_header(const bContext *C,
   Panel *panel = block->panel;
   ARegion *region = CTX_wm_region(C);
 
-  BLI_assert(panel->type != NULL);
+  BLI_assert(panel->type != nullptr);
   BLI_assert(!(panel->type->flag & PANEL_TYPE_NO_HEADER));
 
-  const bool is_subpanel = (panel->type->parent != NULL);
+  const bool is_subpanel = (panel->type->parent != nullptr);
   const bool use_pin = UI_panel_category_is_visible(region) && UI_panel_can_be_pinned(panel);
   const bool show_pin = use_pin && (panel->flag & PNL_PIN);
   const bool show_drag = !is_subpanel;
@@ -2102,8 +2079,8 @@ static void ui_handle_panel_header(const bContext *C,
       else {
         /* If a panel has sub-panels and it's open, toggle the expansion
          * of the sub-panels (based on the expansion of the first sub-panel). */
-        Panel *first_child = panel->children.first;
-        BLI_assert(first_child != NULL);
+        Panel *first_child = static_cast<Panel *>(panel->children.first);
+        BLI_assert(first_child != nullptr);
         panel_set_flag_recursive(panel, PNL_CLOSED, !UI_panel_is_closed(first_child));
         panel->flag |= PNL_CLOSED;
       }
@@ -2115,7 +2092,7 @@ static void ui_handle_panel_header(const bContext *C,
       ui_panel_drag_collapse_handler_add(C, UI_panel_is_closed(panel));
     }
 
-    /* Set panel custom data (modifier) active when expanding subpanels, but not top-level
+    /* Set panel custom data (modifier) active when expanding sub-panels, but not top-level
      * panels to allow collapsing and expanding without setting the active element. */
     if (is_subpanel) {
       panel_custom_data_active_set(panel);
@@ -2157,13 +2134,14 @@ bool UI_panel_category_is_visible(const ARegion *region)
 
 PanelCategoryDyn *UI_panel_category_find(const ARegion *region, const char *idname)
 {
-  return BLI_findstring(&region->panels_category, idname, offsetof(PanelCategoryDyn, idname));
+  return static_cast<PanelCategoryDyn *>(
+      BLI_findstring(&region->panels_category, idname, offsetof(PanelCategoryDyn, idname)));
 }
 
 PanelCategoryStack *UI_panel_category_active_find(ARegion *region, const char *idname)
 {
-  return BLI_findstring(
-      &region->panels_category_active, idname, offsetof(PanelCategoryStack, idname));
+  return static_cast<PanelCategoryStack *>(BLI_findstring(
+      &region->panels_category_active, idname, offsetof(PanelCategoryStack, idname)));
 }
 
 static void ui_panel_category_active_set(ARegion *region, const char *idname, bool fallback)
@@ -2175,7 +2153,7 @@ static void ui_panel_category_active_set(ARegion *region, const char *idname, bo
     BLI_remlink(lb, pc_act);
   }
   else {
-    pc_act = MEM_callocN(sizeof(PanelCategoryStack), __func__);
+    pc_act = MEM_cnew<PanelCategoryStack>(__func__);
     BLI_strncpy(pc_act->idname, idname, sizeof(pc_act->idname));
   }
 
@@ -2226,14 +2204,14 @@ const char *UI_panel_category_active_get(ARegion *region, bool set_fallback)
   }
 
   if (set_fallback) {
-    PanelCategoryDyn *pc_dyn = region->panels_category.first;
+    PanelCategoryDyn *pc_dyn = static_cast<PanelCategoryDyn *>(region->panels_category.first);
     if (pc_dyn) {
       ui_panel_category_active_set(region, pc_dyn->idname, true);
       return pc_dyn->idname;
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 static PanelCategoryDyn *panel_categories_find_mouse_over(ARegion *region, const wmEvent *event)
@@ -2244,12 +2222,12 @@ static PanelCategoryDyn *panel_categories_find_mouse_over(ARegion *region, const
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 void UI_panel_category_add(ARegion *region, const char *name)
 {
-  PanelCategoryDyn *pc_dyn = MEM_callocN(sizeof(*pc_dyn), __func__);
+  PanelCategoryDyn *pc_dyn = MEM_cnew<PanelCategoryDyn>(__func__);
   BLI_addtail(&region->panels_category, pc_dyn);
 
   BLI_strncpy(pc_dyn->idname, name, sizeof(pc_dyn->idname));
@@ -2294,7 +2272,8 @@ static int ui_handle_panel_category_cycling(const wmEvent *event,
           pc_dyn = backwards ? pc_dyn->prev : pc_dyn->next;
           if (!pc_dyn) {
             /* Proper cyclic behavior, back to first/last category (only used for ctrl+tab). */
-            pc_dyn = backwards ? region->panels_category.last : region->panels_category.first;
+            pc_dyn = backwards ? static_cast<PanelCategoryDyn *>(region->panels_category.last) :
+                                 static_cast<PanelCategoryDyn *>(region->panels_category.first);
           }
         }
 
@@ -2318,7 +2297,7 @@ int ui_handler_panel_region(bContext *C,
                             const uiBut *active_but)
 {
   /* Mouse-move events are handled by separate handlers for dragging and drag collapsing. */
-  if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  if (ISMOUSE_MOTION(event->type)) {
     return WM_UI_HANDLER_CONTINUE;
   }
 
@@ -2359,11 +2338,11 @@ int ui_handler_panel_region(bContext *C,
     return retval;
   }
 
-  const bool region_has_active_button = (ui_region_find_active_but(region) != NULL);
+  const bool region_has_active_button = (ui_region_find_active_but(region) != nullptr);
 
   LISTBASE_FOREACH (uiBlock *, block, &region->uiblocks) {
     Panel *panel = block->panel;
-    if (panel == NULL || panel->type == NULL) {
+    if (panel == nullptr || panel->type == nullptr) {
       continue;
     }
     /* We can't expand or collapse panels without headers, they would disappear. */
@@ -2434,10 +2413,10 @@ void UI_panel_context_pointer_set(Panel *panel, const char *name, PointerRNA *pt
 
 void UI_panel_custom_data_set(Panel *panel, PointerRNA *custom_data)
 {
-  BLI_assert(panel->type != NULL);
+  BLI_assert(panel->type != nullptr);
 
   /* Free the old custom data, which should be shared among all of the panel's sub-panels. */
-  if (panel->runtime.custom_data_ptr != NULL) {
+  if (panel->runtime.custom_data_ptr != nullptr) {
     MEM_freeN(panel->runtime.custom_data_ptr);
   }
 
@@ -2455,7 +2434,7 @@ PointerRNA *UI_region_panel_custom_data_under_cursor(const bContext *C, const wm
 
   LISTBASE_FOREACH (uiBlock *, block, &region->uiblocks) {
     Panel *panel = block->panel;
-    if (panel == NULL) {
+    if (panel == nullptr) {
       continue;
     }
 
@@ -2468,12 +2447,12 @@ PointerRNA *UI_region_panel_custom_data_under_cursor(const bContext *C, const wm
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool UI_panel_can_be_pinned(const Panel *panel)
 {
-  return (panel->type->parent == NULL) && !(panel->type->flag & PANEL_TYPE_INSTANCED);
+  return (panel->type->parent == nullptr) && !(panel->type->flag & PANEL_TYPE_INSTANCED);
 }
 
 /** \} */
@@ -2485,8 +2464,8 @@ bool UI_panel_can_be_pinned(const Panel *panel)
 /* NOTE: this is modal handler and should not swallow events for animation. */
 static int ui_handler_panel(bContext *C, const wmEvent *event, void *userdata)
 {
-  Panel *panel = userdata;
-  uiHandlePanelData *data = panel->activedata;
+  Panel *panel = static_cast<Panel *>(userdata);
+  uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
 
   /* Verify if we can stop. */
   if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
@@ -2506,7 +2485,7 @@ static int ui_handler_panel(bContext *C, const wmEvent *event, void *userdata)
     }
   }
 
-  data = panel->activedata;
+  data = static_cast<uiHandlePanelData *>(panel->activedata);
 
   if (data && data->state == PANEL_STATE_ANIMATION) {
     return WM_UI_HANDLER_CONTINUE;
@@ -2516,7 +2495,7 @@ static int ui_handler_panel(bContext *C, const wmEvent *event, void *userdata)
 
 static void ui_handler_remove_panel(bContext *C, void *userdata)
 {
-  Panel *panel = userdata;
+  Panel *panel = static_cast<Panel *>(userdata);
 
   panel_activate_state(C, panel, PANEL_STATE_EXIT);
 }
@@ -2527,13 +2506,13 @@ static void panel_handle_data_ensure(const bContext *C,
                                      Panel *panel,
                                      const uiHandlePanelState state)
 {
-  if (panel->activedata == NULL) {
+  if (panel->activedata == nullptr) {
     panel->activedata = MEM_callocN(sizeof(uiHandlePanelData), __func__);
     WM_event_add_ui_handler(
         C, &win->modalhandlers, ui_handler_panel, ui_handler_remove_panel, panel, 0);
   }
 
-  uiHandlePanelData *data = panel->activedata;
+  uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
 
   data->animtimer = WM_event_add_timer(CTX_wm_manager(C), win, TIMER, ANIMATION_INTERVAL);
 
@@ -2554,11 +2533,11 @@ static void panel_handle_data_ensure(const bContext *C,
  */
 static void panel_activate_state(const bContext *C, Panel *panel, const uiHandlePanelState state)
 {
-  uiHandlePanelData *data = panel->activedata;
+  uiHandlePanelData *data = static_cast<uiHandlePanelData *>(panel->activedata);
   wmWindow *win = CTX_wm_window(C);
   ARegion *region = CTX_wm_region(C);
 
-  if (data != NULL && data->state == state) {
+  if (data != nullptr && data->state == state) {
     return;
   }
 
@@ -2582,15 +2561,15 @@ static void panel_activate_state(const bContext *C, Panel *panel, const uiHandle
   else if (state == PANEL_STATE_EXIT) {
     panel_set_runtime_flag_recursive(panel, PANEL_IS_DRAG_DROP, false);
 
-    BLI_assert(data != NULL);
+    BLI_assert(data != nullptr);
 
     if (data->animtimer) {
       WM_event_remove_timer(CTX_wm_manager(C), win, data->animtimer);
-      data->animtimer = NULL;
+      data->animtimer = nullptr;
     }
 
     MEM_freeN(data);
-    panel->activedata = NULL;
+    panel->activedata = nullptr;
 
     WM_event_remove_ui_handler(
         &win->modalhandlers, ui_handler_panel, ui_handler_remove_panel, panel, false);
diff --git a/source/blender/editors/interface/interface_query.cc b/source/blender/editors/interface/interface_query.cc
index 71cf60985df..f084f3e06cb 100644
--- a/source/blender/editors/interface/interface_query.cc
+++ b/source/blender/editors/interface/interface_query.cc
@@ -54,13 +54,7 @@ bool ui_but_is_toggle(const uiBut *but)
               UI_BTYPE_TOGGLE_N,
               UI_BTYPE_CHECKBOX,
               UI_BTYPE_CHECKBOX_N,
-              UI_BTYPE_ROW,
-              UI_BTYPE_TREEROW);
-}
-
-bool ui_but_is_view_item(const uiBut *but)
-{
-  return ELEM(but->type, UI_BTYPE_TREEROW, UI_BTYPE_GRID_TILE);
+              UI_BTYPE_ROW);
 }
 
 bool ui_but_is_interactive_ex(const uiBut *but, const bool labeledit, const bool for_tooltip)
@@ -462,14 +456,9 @@ uiBut *ui_list_row_find_from_index(const ARegion *region, const int index, uiBut
   return ui_but_find(region, ui_but_is_listrow_at_index, &data);
 }
 
-static bool ui_but_is_treerow(const uiBut *but, const void *UNUSED(customdata))
-{
-  return but->type == UI_BTYPE_TREEROW;
-}
-
 static bool ui_but_is_view_item_fn(const uiBut *but, const void *UNUSED(customdata))
 {
-  return ui_but_is_view_item(but);
+  return but->type == UI_BTYPE_VIEW_ITEM;
 }
 
 uiBut *ui_view_item_find_mouse_over(const ARegion *region, const int xy[2])
@@ -477,24 +466,19 @@ uiBut *ui_view_item_find_mouse_over(const ARegion *region, const int xy[2])
   return ui_but_find_mouse_over_ex(region, xy, false, false, ui_but_is_view_item_fn, nullptr);
 }
 
-uiBut *ui_tree_row_find_mouse_over(const ARegion *region, const int xy[2])
-{
-  return ui_but_find_mouse_over_ex(region, xy, false, false, ui_but_is_treerow, nullptr);
-}
-
-static bool ui_but_is_active_treerow(const uiBut *but, const void *customdata)
+static bool ui_but_is_active_view_item(const uiBut *but, const void *UNUSED(customdata))
 {
-  if (!ui_but_is_treerow(but, customdata)) {
+  if (but->type != UI_BTYPE_VIEW_ITEM) {
     return false;
   }
 
-  const uiButTreeRow *treerow_but = (const uiButTreeRow *)but;
-  return UI_tree_view_item_is_active(treerow_but->tree_item);
+  const uiButViewItem *view_item_but = (const uiButViewItem *)but;
+  return UI_view_item_is_active(view_item_but->view_item);
 }
 
-uiBut *ui_tree_row_find_active(const ARegion *region)
+uiBut *ui_view_item_find_active(const ARegion *region)
 {
-  return ui_but_find(region, ui_but_is_active_treerow, nullptr);
+  return ui_but_find(region, ui_but_is_active_view_item, nullptr);
 }
 
 /** \} */
diff --git a/source/blender/editors/interface/interface_region_color_picker.cc b/source/blender/editors/interface/interface_region_color_picker.cc
index db1e5e653de..72912b8c7f7 100644
--- a/source/blender/editors/interface/interface_region_color_picker.cc
+++ b/source/blender/editors/interface/interface_region_color_picker.cc
@@ -52,10 +52,10 @@ static void ui_color_picker_rgb_round(float rgb[3])
    * all color space conversions would be expensive, but for the color picker
    * we can do the extra work. */
   for (int i = 0; i < 3; i++) {
-    if (fabsf(rgb[i]) < 1e-6f) {
+    if (fabsf(rgb[i]) < 5e-5f) {
       rgb[i] = 0.0f;
     }
-    else if (fabsf(1.0f - rgb[i]) < 1e-6f) {
+    else if (fabsf(1.0f - rgb[i]) < 5e-5f) {
       rgb[i] = 1.0f;
     }
   }
diff --git a/source/blender/editors/interface/interface_region_menu_pie.cc b/source/blender/editors/interface/interface_region_menu_pie.cc
index b11564f09c5..becdfaf4e25 100644
--- a/source/blender/editors/interface/interface_region_menu_pie.cc
+++ b/source/blender/editors/interface/interface_region_menu_pie.cc
@@ -27,6 +27,7 @@
 #include "WM_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "UI_interface.h"
@@ -36,7 +37,7 @@
 #include "ED_screen.h"
 
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 /* -------------------------------------------------------------------- */
 /** \name Pie Menu
@@ -371,7 +372,7 @@ void ui_pie_menu_level_create(uiBlock *block,
   EnumPropertyItem *remaining = static_cast<EnumPropertyItem *>(
       MEM_mallocN(array_size + sizeof(EnumPropertyItem), "pie_level_item_array"));
   memcpy(remaining, items + totitem_parent, array_size);
-  /* A nullptr terminating sentinel element is required. */
+  /* A null terminating sentinel element is required. */
   memset(&remaining[totitem_remain], 0, sizeof(EnumPropertyItem));
 
   /* yuk, static... issue is we can't reliably free this without doing dangerous changes */
diff --git a/source/blender/editors/interface/interface_region_menu_popup.cc b/source/blender/editors/interface/interface_region_menu_popup.cc
index a22f7218203..f88cabb2b70 100644
--- a/source/blender/editors/interface/interface_region_menu_popup.cc
+++ b/source/blender/editors/interface/interface_region_menu_popup.cc
@@ -39,7 +39,7 @@
 #include "ED_screen.h"
 
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 /* -------------------------------------------------------------------- */
 /** \name Utility Functions
@@ -322,7 +322,7 @@ uiPopupBlockHandle *ui_popup_menu_create(
 
   uiPopupMenu *pup = MEM_cnew<uiPopupMenu>(__func__);
   pup->block = UI_block_begin(C, nullptr, __func__, UI_EMBOSS_PULLDOWN);
-  pup->block->flag |= UI_BLOCK_NUMSELECT; /* default menus to numselect */
+  pup->block->flag |= UI_BLOCK_NUMSELECT; /* Default menus to numeric-selection. */
   pup->layout = UI_block_layout(
       pup->block, UI_LAYOUT_VERTICAL, UI_LAYOUT_MENU, 0, 0, 200, 0, UI_MENU_PADDING, style);
   pup->slideout = but ? ui_block_is_menu(but->block) : false;
diff --git a/source/blender/editors/interface/interface_region_popover.cc b/source/blender/editors/interface/interface_region_popover.cc
index 2e10261a4f7..17c8d890755 100644
--- a/source/blender/editors/interface/interface_region_popover.cc
+++ b/source/blender/editors/interface/interface_region_popover.cc
@@ -46,7 +46,7 @@
 #include "UI_interface.h"
 
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 /* -------------------------------------------------------------------- */
 /** \name Popup Menu with Callback or String
@@ -397,7 +397,7 @@ void UI_popover_end(bContext *C, uiPopover *pup, wmKeyMap *keymap)
 
   pup->window = window;
 
-  /* TODO(campbell): we may want to make this configurable.
+  /* TODO(@campbellbarton): we may want to make this configurable.
    * The begin/end stype of calling popups doesn't allow 'can_refresh' to be set.
    * For now close this style of popovers when accessed. */
   UI_block_flag_disable(pup->block, UI_BLOCK_KEEP_OPEN);
diff --git a/source/blender/editors/interface/interface_region_popup.cc b/source/blender/editors/interface/interface_region_popup.cc
index 74c228e3338..daa46b150a3 100644
--- a/source/blender/editors/interface/interface_region_popup.cc
+++ b/source/blender/editors/interface/interface_region_popup.cc
@@ -31,7 +31,7 @@
 #include "ED_screen.h"
 
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 /* -------------------------------------------------------------------- */
 /** \name Utility Functions
@@ -397,7 +397,7 @@ static void ui_block_region_draw(const bContext *C, ARegion *region)
 static void ui_block_region_popup_window_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   switch (wmn->category) {
     case NC_WINDOW: {
diff --git a/source/blender/editors/interface/interface_region_search.cc b/source/blender/editors/interface/interface_region_search.cc
index 81c0c29d09a..fb7810792e9 100644
--- a/source/blender/editors/interface/interface_region_search.cc
+++ b/source/blender/editors/interface/interface_region_search.cc
@@ -10,6 +10,7 @@
 #include <cstdarg>
 #include <cstdlib>
 #include <cstring>
+#include <iostream>
 
 #include "DNA_ID.h"
 #include "MEM_guardedalloc.h"
@@ -41,7 +42,7 @@
 
 #include "GPU_state.h"
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 #define MENU_BORDER (int)(0.3f * U.widget_unit)
 
@@ -86,6 +87,10 @@ struct uiSearchboxData {
    * Used so we can show leading text to menu items less prominently (not related to 'use_sep').
    */
   const char *sep_string;
+
+  /* Owned by uiButSearch */
+  void *search_arg;
+  uiButSearchListenFn search_listener;
 };
 
 #define SEARCH_ITEMS 10
@@ -689,6 +694,14 @@ static void ui_searchbox_region_free_fn(ARegion *region)
   region->regiondata = nullptr;
 }
 
+static void ui_searchbox_region_listen_fn(const wmRegionListenerParams *params)
+{
+  uiSearchboxData *data = static_cast<uiSearchboxData *>(params->region->regiondata);
+  if (data->search_listener) {
+    data->search_listener(params, data->search_arg);
+  }
+}
+
 static ARegion *ui_searchbox_create_generic_ex(bContext *C,
                                                ARegion *butregion,
                                                uiButSearch *search_but,
@@ -707,21 +720,24 @@ static ARegion *ui_searchbox_create_generic_ex(bContext *C,
   memset(&type, 0, sizeof(ARegionType));
   type.draw = ui_searchbox_region_draw_fn;
   type.free = ui_searchbox_region_free_fn;
+  type.listener = ui_searchbox_region_listen_fn;
   type.regionid = RGN_TYPE_TEMPORARY;
   region->type = &type;
 
-  /* create searchbox data */
+  /* Create search-box data. */
   uiSearchboxData *data = MEM_cnew<uiSearchboxData>(__func__);
+  data->search_arg = search_but->arg;
+  data->search_listener = search_but->listen_fn;
 
-  /* set font, get bb */
+  /* Set font, get the bounding-box. */
   data->fstyle = style->widget; /* copy struct */
   ui_fontscale(&data->fstyle.points, aspect);
   UI_fontstyle_set(&data->fstyle);
 
   region->regiondata = data;
 
-  /* special case, hardcoded feature, not draw backdrop when called from menus,
-   * assume for design that popup already added it */
+  /* Special case, hard-coded feature, not draw backdrop when called from menus,
+   * assume for design that popup already added it. */
   if (but->block->flag & UI_BLOCK_SEARCH_MENU) {
     data->noback = true;
   }
diff --git a/source/blender/editors/interface/interface_region_tooltip.c b/source/blender/editors/interface/interface_region_tooltip.cc
index 88fe866f717..a6e37d3f36f 100644
--- a/source/blender/editors/interface/interface_region_tooltip.c
+++ b/source/blender/editors/interface/interface_region_tooltip.cc
@@ -7,7 +7,7 @@
  * ToolTip Region and Construction
  */
 
-/* TODO(campbell):
+/* TODO(@campbellbarton):
  * We may want to have a higher level API that initializes a timer,
  * checks for mouse motion and clears the tool-tip afterwards.
  * We never want multiple tool-tips at once
@@ -16,9 +16,9 @@
  * For now it's not a priority, so leave as-is.
  */
 
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cstdarg>
+#include <cstdlib>
+#include <cstring>
 
 #include "MEM_guardedalloc.h"
 
@@ -39,6 +39,7 @@
 #include "WM_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "UI_interface.h"
 
@@ -52,7 +53,7 @@
 #include "ED_screen.h"
 
 #include "interface_intern.h"
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 #define UI_TIP_PAD_FAC 1.3f
 #define UI_TIP_PADDING (int)(UI_TIP_PAD_FAC * UI_UNIT_Y)
@@ -60,59 +61,82 @@
 
 #define UI_TIP_STR_MAX 1024
 
-typedef struct uiTooltipFormat {
-  enum {
-    UI_TIP_STYLE_NORMAL = 0,
-    UI_TIP_STYLE_HEADER,
-    UI_TIP_STYLE_MONO,
-  } style : 3;
-  enum {
-    UI_TIP_LC_MAIN = 0, /* primary text */
-    UI_TIP_LC_VALUE,    /* the value of buttons (also shortcuts) */
-    UI_TIP_LC_ACTIVE,   /* titles of active enum values */
-    UI_TIP_LC_NORMAL,   /* regular text */
-    UI_TIP_LC_PYTHON,   /* Python snippet */
-    UI_TIP_LC_ALERT,    /* description of why operator can't run */
-  } color_id : 4;
-  int is_pad : 1;
-} uiTooltipFormat;
-
-typedef struct uiTooltipField {
+struct uiTooltipFormat {
+  enum class Style : int8_t {
+    Normal,
+    Header,
+    Mono,
+  };
+  enum class ColorID : int8_t {
+    /** Primary Text. */
+    Main = 0,
+    /** The value of buttons (also shortcuts). */
+    Value = 1,
+    /** Titles of active enum values. */
+    Active = 2,
+    /** Regular text. */
+    Normal = 3,
+    /** Python snippet. */
+    Python = 4,
+    /** Description of why an operator can't run. */
+    Alert = 5,
+  };
+  Style style;
+  ColorID color_id;
+  bool is_pad;
+};
+
+struct uiTooltipField {
   char *text;
   char *text_suffix;
   struct {
-    uint x_pos; /* x cursor position at the end of the last line */
-    uint lines; /* number of lines, 1 or more with word-wrap */
+    /** X cursor position at the end of the last line. */
+    uint x_pos;
+    /** Number of lines, 1 or more with word-wrap. */
+    uint lines;
   } geom;
   uiTooltipFormat format;
+};
 
-} uiTooltipField;
-
-typedef struct uiTooltipData {
+struct uiTooltipData {
   rcti bbox;
   uiTooltipField *fields;
   uint fields_len;
   uiFontStyle fstyle;
   int wrap_width;
   int toth, lineh;
-} uiTooltipData;
+};
 
 #define UI_TIP_LC_MAX 6
 
-BLI_STATIC_ASSERT(UI_TIP_LC_MAX == UI_TIP_LC_ALERT + 1, "invalid lc-max");
+BLI_STATIC_ASSERT(UI_TIP_LC_MAX == static_cast<int>(uiTooltipFormat::ColorID::Alert) + 1,
+                  "invalid lc-max");
 BLI_STATIC_ASSERT(sizeof(uiTooltipFormat) <= sizeof(int), "oversize");
 
 static uiTooltipField *text_field_add_only(uiTooltipData *data)
 {
   data->fields_len += 1;
-  data->fields = MEM_recallocN(data->fields, sizeof(*data->fields) * data->fields_len);
+  data->fields = static_cast<uiTooltipField *>(
+      MEM_recallocN(data->fields, sizeof(*data->fields) * data->fields_len));
   return &data->fields[data->fields_len - 1];
 }
 
-static uiTooltipField *text_field_add(uiTooltipData *data, const uiTooltipFormat *format)
+// static uiTooltipField *text_field_add(uiTooltipData *data, const uiTooltipFormat *format)
+// {
+//   uiTooltipField *field = text_field_add_only(data);
+//   field->format = *format;
+//   return field;
+// }
+
+static uiTooltipField *text_field_add(uiTooltipData *data,
+                                      const uiTooltipFormat::Style style,
+                                      const uiTooltipFormat::ColorID color,
+                                      const bool is_pad = false)
 {
   uiTooltipField *field = text_field_add_only(data);
-  field->format = *format;
+  field->format = {};
+  field->format.style = style;
+  field->format.color_id = color, field->format.is_pad = is_pad;
   return field;
 }
 
@@ -137,30 +161,31 @@ static void rgb_tint(float col[3], float h, float h_strength, float v, float v_s
 static void ui_tooltip_region_draw_cb(const bContext *UNUSED(C), ARegion *region)
 {
   const float pad_px = UI_TIP_PADDING;
-  uiTooltipData *data = region->regiondata;
+  uiTooltipData *data = static_cast<uiTooltipData *>(region->regiondata);
   const uiWidgetColors *theme = ui_tooltip_get_theme();
   rcti bbox = data->bbox;
   float tip_colors[UI_TIP_LC_MAX][3];
   uchar drawcol[4] = {0, 0, 0, 255}; /* to store color in while drawing (alpha is always 255) */
 
-  float *main_color = tip_colors[UI_TIP_LC_MAIN]; /* the color from the theme */
-  float *value_color = tip_colors[UI_TIP_LC_VALUE];
-  float *active_color = tip_colors[UI_TIP_LC_ACTIVE];
-  float *normal_color = tip_colors[UI_TIP_LC_NORMAL];
-  float *python_color = tip_colors[UI_TIP_LC_PYTHON];
-  float *alert_color = tip_colors[UI_TIP_LC_ALERT];
+  /* The color from the theme. */
+  float *main_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Main)];
+  float *value_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Value)];
+  float *active_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Active)];
+  float *normal_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Normal)];
+  float *python_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Python)];
+  float *alert_color = tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Alert)];
 
   float background_color[3];
 
   wmOrtho2_region_pixelspace(region);
 
-  /* draw background */
-  ui_draw_tooltip_background(UI_style_get(), NULL, &bbox);
+  /* Draw background. */
+  ui_draw_tooltip_background(UI_style_get(), nullptr, &bbox);
 
   /* set background_color */
   rgb_uchar_to_float(background_color, theme->inner);
 
-  /* calculate normal_color */
+  /* Calculate `normal_color`. */
   rgb_uchar_to_float(main_color, theme->text);
   copy_v3_v3(active_color, main_color);
   copy_v3_v3(normal_color, main_color);
@@ -168,19 +193,19 @@ static void ui_tooltip_region_draw_cb(const bContext *UNUSED(C), ARegion *region
   copy_v3_v3(alert_color, main_color);
   copy_v3_v3(value_color, main_color);
 
-  /* find the brightness difference between background and text colors */
+  /* Find the brightness difference between background and text colors. */
 
   const float tone_bg = rgb_to_grayscale(background_color);
-  /* tone_fg = rgb_to_grayscale(main_color); */
+  // tone_fg = rgb_to_grayscale(main_color);
 
-  /* mix the colors */
+  /* Mix the colors. */
   rgb_tint(value_color, 0.0f, 0.0f, tone_bg, 0.2f);  /* Light gray. */
   rgb_tint(active_color, 0.6f, 0.2f, tone_bg, 0.2f); /* Light blue. */
   rgb_tint(normal_color, 0.0f, 0.0f, tone_bg, 0.4f); /* Gray. */
   rgb_tint(python_color, 0.0f, 0.0f, tone_bg, 0.5f); /* Dark gray. */
   rgb_tint(alert_color, 0.0f, 0.8f, tone_bg, 0.1f);  /* Red. */
 
-  /* draw text */
+  /* Draw text. */
   BLF_wordwrap(data->fstyle.uifont_id, data->wrap_width);
   BLF_wordwrap(blf_mono_font, data->wrap_width);
 
@@ -189,58 +214,58 @@ static void ui_tooltip_region_draw_cb(const bContext *UNUSED(C), ARegion *region
 
   for (int i = 0; i < data->fields_len; i++) {
     const uiTooltipField *field = &data->fields[i];
-    const uiTooltipField *field_next = (i + 1) != data->fields_len ? &data->fields[i + 1] : NULL;
+    const uiTooltipField *field_next = (i + 1) != data->fields_len ? &data->fields[i + 1] :
+                                                                     nullptr;
 
     bbox.ymin = bbox.ymax - (data->lineh * field->geom.lines);
-    if (field->format.style == UI_TIP_STYLE_HEADER) {
-      const struct uiFontStyleDraw_Params fs_params = {
-          .align = UI_STYLE_TEXT_LEFT,
-          .word_wrap = true,
-      };
-      /* draw header and active data (is done here to be able to change color) */
-      rgb_float_to_uchar(drawcol, tip_colors[UI_TIP_LC_MAIN]);
+    if (field->format.style == uiTooltipFormat::Style::Header) {
+      uiFontStyleDraw_Params fs_params{};
+      fs_params.align = UI_STYLE_TEXT_LEFT;
+      fs_params.word_wrap = true;
+
+      /* Draw header and active data (is done here to be able to change color). */
+      rgb_float_to_uchar(drawcol, tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Main)]);
       UI_fontstyle_set(&data->fstyle);
       UI_fontstyle_draw(&data->fstyle, &bbox, field->text, UI_TIP_STR_MAX, drawcol, &fs_params);
 
-      /* offset to the end of the last line */
+      /* Offset to the end of the last line. */
       if (field->text_suffix) {
         const float xofs = field->geom.x_pos;
         const float yofs = data->lineh * (field->geom.lines - 1);
         bbox.xmin += xofs;
         bbox.ymax -= yofs;
 
-        rgb_float_to_uchar(drawcol, tip_colors[UI_TIP_LC_ACTIVE]);
+        rgb_float_to_uchar(drawcol,
+                           tip_colors[static_cast<int>(uiTooltipFormat::ColorID::Active)]);
         UI_fontstyle_draw(
             &data->fstyle, &bbox, field->text_suffix, UI_TIP_STR_MAX, drawcol, &fs_params);
 
-        /* undo offset */
+        /* Undo offset. */
         bbox.xmin -= xofs;
         bbox.ymax += yofs;
       }
     }
-    else if (field->format.style == UI_TIP_STYLE_MONO) {
-      const struct uiFontStyleDraw_Params fs_params = {
-          .align = UI_STYLE_TEXT_LEFT,
-          .word_wrap = true,
-      };
+    else if (field->format.style == uiTooltipFormat::Style::Mono) {
+      uiFontStyleDraw_Params fs_params{};
+      fs_params.align = UI_STYLE_TEXT_LEFT;
+      fs_params.word_wrap = true;
       uiFontStyle fstyle_mono = data->fstyle;
       fstyle_mono.uifont_id = blf_mono_font;
 
       UI_fontstyle_set(&fstyle_mono);
-      /* XXX, needed because we don't have mono in 'U.uifonts' */
+      /* XXX: needed because we don't have mono in 'U.uifonts'. */
       BLF_size(fstyle_mono.uifont_id, fstyle_mono.points * U.pixelsize, U.dpi);
-      rgb_float_to_uchar(drawcol, tip_colors[field->format.color_id]);
+      rgb_float_to_uchar(drawcol, tip_colors[static_cast<int>(field->format.color_id)]);
       UI_fontstyle_draw(&fstyle_mono, &bbox, field->text, UI_TIP_STR_MAX, drawcol, &fs_params);
     }
     else {
-      BLI_assert(field->format.style == UI_TIP_STYLE_NORMAL);
-      const struct uiFontStyleDraw_Params fs_params = {
-          .align = UI_STYLE_TEXT_LEFT,
-          .word_wrap = true,
-      };
-
-      /* draw remaining data */
-      rgb_float_to_uchar(drawcol, tip_colors[field->format.color_id]);
+      BLI_assert(field->format.style == uiTooltipFormat::Style::Normal);
+      uiFontStyleDraw_Params fs_params{};
+      fs_params.align = UI_STYLE_TEXT_LEFT;
+      fs_params.word_wrap = true;
+
+      /* Draw remaining data. */
+      rgb_float_to_uchar(drawcol, tip_colors[static_cast<int>(field->format.color_id)]);
       UI_fontstyle_set(&data->fstyle);
       UI_fontstyle_draw(&data->fstyle, &bbox, field->text, UI_TIP_STR_MAX, drawcol, &fs_params);
     }
@@ -258,7 +283,7 @@ static void ui_tooltip_region_draw_cb(const bContext *UNUSED(C), ARegion *region
 
 static void ui_tooltip_region_free_cb(ARegion *region)
 {
-  uiTooltipData *data = region->regiondata;
+  uiTooltipData *data = static_cast<uiTooltipData *>(region->regiondata);
 
   for (int i = 0; i < data->fields_len; i++) {
     const uiTooltipField *field = &data->fields[i];
@@ -269,7 +294,7 @@ static void ui_tooltip_region_free_cb(ARegion *region)
   }
   MEM_freeN(data->fields);
   MEM_freeN(data);
-  region->regiondata = NULL;
+  region->regiondata = nullptr;
 }
 
 /** \} */
@@ -280,7 +305,7 @@ static void ui_tooltip_region_free_cb(ARegion *region)
 
 static char *ui_tooltip_text_python_from_op(bContext *C, wmOperatorType *ot, PointerRNA *opptr)
 {
-  char *str = WM_operator_pystring_ex(C, NULL, false, false, ot, opptr);
+  char *str = WM_operator_pystring_ex(C, nullptr, false, false, ot, opptr);
 
   /* Avoid overly verbose tips (eg, arrays of 20 layers), exact limit is arbitrary. */
   WM_operator_pystring_abbreviate(str, 32);
@@ -303,24 +328,17 @@ static bool ui_tooltip_data_append_from_keymap(bContext *C, uiTooltipData *data,
 
   LISTBASE_FOREACH (wmKeyMapItem *, kmi, &keymap->items) {
     wmOperatorType *ot = WM_operatortype_find(kmi->idname, true);
-    if (ot != NULL) {
-      /* Tip */
+    if (ot != nullptr) {
+      /* Tip. */
       {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_MAIN,
-                                                   .is_pad = true,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Main, true);
         field->text = BLI_strdup(ot->description ? ot->description : ot->name);
       }
-      /* Shortcut */
+      /* Shortcut. */
       {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_NORMAL,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal);
         bool found = false;
         if (WM_keymap_item_to_string(kmi, false, buf, sizeof(buf))) {
           found = true;
@@ -328,13 +346,10 @@ static bool ui_tooltip_data_append_from_keymap(bContext *C, uiTooltipData *data,
         field->text = BLI_sprintfN(TIP_("Shortcut: %s"), found ? buf : "None");
       }
 
-      /* Python */
+      /* Python. */
       if (U.flag & USER_TOOLTIPS_PYTHON) {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_PYTHON,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Python);
         char *str = ui_tooltip_text_python_from_op(C, ot, kmi->ptr);
         field->text = BLI_sprintfN(TIP_("Python: %s"), str);
         MEM_freeN(str);
@@ -352,17 +367,17 @@ static bool ui_tooltip_data_append_from_keymap(bContext *C, uiTooltipData *data,
  */
 static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is_label)
 {
-  if (but->optype == NULL) {
-    return NULL;
+  if (but->optype == nullptr) {
+    return nullptr;
   }
 
   if (!STREQ(but->optype->idname, "WM_OT_tool_set_by_id")) {
-    return NULL;
+    return nullptr;
   }
 
   /* Needed to get the space-data's type (below). */
-  if (CTX_wm_space_data(C) == NULL) {
-    return NULL;
+  if (CTX_wm_space_data(C) == nullptr) {
+    return nullptr;
   }
 
   char tool_id[MAX_NAME];
@@ -377,7 +392,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
   const char *has_valid_context_error = IFACE_("Unsupported context");
   {
     ScrArea *area = CTX_wm_area(C);
-    if (area == NULL) {
+    if (area == nullptr) {
       has_valid_context = false;
     }
     else {
@@ -392,16 +407,15 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
   }
 
   /* We have a tool, now extract the info. */
-  uiTooltipData *data = MEM_callocN(sizeof(uiTooltipData), "uiTooltipData");
+  uiTooltipData *data = MEM_cnew<uiTooltipData>(__func__);
 
 #ifdef WITH_PYTHON
-  /* it turns out to be most simple to do this via Python since C
-   * doesn't have access to information about non-active tools.
-   */
+  /* It turns out to be most simple to do this via Python since C
+   * doesn't have access to information about non-active tools. */
 
   /* Title (when icon-only). */
   if (but->drawstr[0] == '\0') {
-    const char *expr_imports[] = {"bpy", "bl_ui", NULL};
+    const char *expr_imports[] = {"bpy", "bl_ui", nullptr};
     char expr[256];
     SNPRINTF(expr,
              "bl_ui.space_toolsystem_common.item_from_id("
@@ -409,16 +423,16 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
              "bpy.context.space_data.type, "
              "'%s').label",
              tool_id);
-    char *expr_result = NULL;
+    char *expr_result = nullptr;
     bool is_error = false;
 
     if (has_valid_context == false) {
       expr_result = BLI_strdup(has_valid_context_error);
     }
-    else if (BPY_run_string_as_string(C, expr_imports, expr, NULL, &expr_result)) {
+    else if (BPY_run_string_as_string(C, expr_imports, expr, nullptr, &expr_result)) {
       if (STREQ(expr_result, "")) {
         MEM_freeN(expr_result);
-        expr_result = NULL;
+        expr_result = nullptr;
       }
     }
     else {
@@ -428,7 +442,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
       is_error = true;
     }
 
-    if (expr_result != NULL) {
+    if (expr_result != nullptr) {
       /* NOTE: This is a very weak hack to get a valid translation most of the time...
        * Proper way to do would be to get i18n context from the item, somehow. */
       const char *label_str = CTX_IFACE_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, expr_result);
@@ -441,23 +455,19 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
         expr_result = BLI_strdup(label_str);
       }
 
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_NORMAL,
-                                                 .color_id = UI_TIP_LC_MAIN,
-                                                 .is_pad = true,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Main, true);
       field->text = expr_result;
 
       if (UNLIKELY(is_error)) {
-        field->format.color_id = UI_TIP_LC_ALERT;
+        field->format.color_id = uiTooltipFormat::ColorID::Alert;
       }
     }
   }
 
   /* Tip. */
   if (is_label == false) {
-    const char *expr_imports[] = {"bpy", "bl_ui", NULL};
+    const char *expr_imports[] = {"bpy", "bl_ui", nullptr};
     char expr[256];
     SNPRINTF(expr,
              "bl_ui.space_toolsystem_common.description_from_id("
@@ -466,16 +476,16 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
              "'%s') + '.'",
              tool_id);
 
-    char *expr_result = NULL;
+    char *expr_result = nullptr;
     bool is_error = false;
 
     if (has_valid_context == false) {
       expr_result = BLI_strdup(has_valid_context_error);
     }
-    else if (BPY_run_string_as_string(C, expr_imports, expr, NULL, &expr_result)) {
+    else if (BPY_run_string_as_string(C, expr_imports, expr, nullptr, &expr_result)) {
       if (STREQ(expr_result, ".")) {
         MEM_freeN(expr_result);
-        expr_result = NULL;
+        expr_result = nullptr;
       }
     }
     else {
@@ -485,17 +495,13 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
       is_error = true;
     }
 
-    if (expr_result != NULL) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_NORMAL,
-                                                 .color_id = UI_TIP_LC_MAIN,
-                                                 .is_pad = true,
-                                             });
+    if (expr_result != nullptr) {
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Main, true);
       field->text = expr_result;
 
       if (UNLIKELY(is_error)) {
-        field->format.color_id = UI_TIP_LC_ALERT;
+        field->format.color_id = uiTooltipFormat::ColorID::Alert;
       }
     }
   }
@@ -514,18 +520,18 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
      *
      * Either way case it's useful to show the shortcut.
      */
-    char *shortcut = NULL;
+    char *shortcut = nullptr;
 
     {
-      uiStringInfo op_keymap = {BUT_GET_OP_KEYMAP, NULL};
-      UI_but_string_info_get(C, but, &op_keymap, NULL);
+      uiStringInfo op_keymap = {BUT_GET_OP_KEYMAP, nullptr};
+      UI_but_string_info_get(C, but, &op_keymap, nullptr);
       shortcut = op_keymap.strinfo;
     }
 
-    if (shortcut == NULL) {
+    if (shortcut == nullptr) {
       const ePaintMode paint_mode = BKE_paintmode_get_active_from_context(C);
       const char *tool_attr = BKE_paint_get_tool_prop_id_from_paintmode(paint_mode);
-      if (tool_attr != NULL) {
+      if (tool_attr != nullptr) {
         const EnumPropertyItem *items = BKE_paint_get_tool_enum_from_paintmode(paint_mode);
         const char *tool_id_lstrip = strrchr(tool_id, '.');
         const int tool_id_offset = tool_id_lstrip ? ((tool_id_lstrip - tool_id) + 1) : 0;
@@ -542,7 +548,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
           if (WM_key_event_operator_string(C,
                                            ot->idname,
                                            WM_OP_INVOKE_REGION_WIN,
-                                           op_props.data,
+                                           static_cast<IDProperty *>(op_props.data),
                                            true,
                                            shortcut_brush,
                                            ARRAY_SIZE(shortcut_brush))) {
@@ -553,20 +559,20 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
       }
     }
 
-    if (shortcut == NULL) {
+    if (shortcut == nullptr) {
       /* Check for direct access to the tool. */
       char shortcut_toolbar[128] = "";
       if (WM_key_event_operator_string(C,
                                        "WM_OT_toolbar",
                                        WM_OP_INVOKE_REGION_WIN,
-                                       NULL,
+                                       nullptr,
                                        true,
                                        shortcut_toolbar,
                                        ARRAY_SIZE(shortcut_toolbar))) {
         /* Generate keymap in order to inspect it.
          * NOTE: we could make a utility to avoid the keymap generation part of this. */
         const char *expr_imports[] = {
-            "bpy", "bl_keymap_utils", "bl_keymap_utils.keymap_from_toolbar", NULL};
+            "bpy", "bl_keymap_utils", "bl_keymap_utils.keymap_from_toolbar", nullptr};
         const char *expr =
             ("getattr("
              "bl_keymap_utils.keymap_from_toolbar.generate("
@@ -579,7 +585,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
         if (has_valid_context == false) {
           shortcut = BLI_strdup(has_valid_context_error);
         }
-        else if (BPY_run_string_as_intptr(C, expr_imports, expr, NULL, &expr_result)) {
+        else if (BPY_run_string_as_intptr(C, expr_imports, expr, nullptr, &expr_result)) {
           if (expr_result != 0) {
             wmKeyMap *keymap = (wmKeyMap *)expr_result;
             LISTBASE_FOREACH (wmKeyMapItem *, kmi, &keymap->items) {
@@ -602,13 +608,9 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
       }
     }
 
-    if (shortcut != NULL) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_NORMAL,
-                                                 .color_id = UI_TIP_LC_VALUE,
-                                                 .is_pad = true,
-                                             });
+    if (shortcut != nullptr) {
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
       field->text = BLI_sprintfN(TIP_("Shortcut: %s"), shortcut);
       MEM_freeN(shortcut);
     }
@@ -626,11 +628,11 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
      * This is a little involved since the shortcut may be bound to another tool in this group,
      * instead of the current tool on display. */
 
-    char *expr_result = NULL;
+    char *expr_result = nullptr;
     size_t expr_result_len;
 
     {
-      const char *expr_imports[] = {"bpy", "bl_ui", NULL};
+      const char *expr_imports[] = {"bpy", "bl_ui", nullptr};
       char expr[256];
       SNPRINTF(expr,
                "'\\x00'.join("
@@ -644,12 +646,12 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
         /* pass */
       }
       else if (BPY_run_string_as_string_and_size(
-                   C, expr_imports, expr, NULL, &expr_result, &expr_result_len)) {
+                   C, expr_imports, expr, nullptr, &expr_result, &expr_result_len)) {
         /* pass. */
       }
     }
 
-    if (expr_result != NULL) {
+    if (expr_result != nullptr) {
       PointerRNA op_props;
       WM_operator_properties_create_ptr(&op_props, but->optype);
       RNA_boolean_set(&op_props, "cycle", true);
@@ -664,7 +666,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
         if (WM_key_event_operator_string(C,
                                          but->optype->idname,
                                          WM_OP_INVOKE_REGION_WIN,
-                                         op_props.data,
+                                         static_cast<IDProperty *>(op_props.data),
                                          true,
                                          shortcut,
                                          ARRAY_SIZE(shortcut))) {
@@ -677,12 +679,8 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
       MEM_freeN(expr_result);
 
       if (shortcut[0] != '\0') {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_VALUE,
-                                                   .is_pad = true,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
         field->text = BLI_sprintfN(TIP_("Shortcut Cycle: %s"), shortcut);
       }
     }
@@ -690,12 +688,8 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
 
   /* Python */
   if ((is_label == false) && (U.flag & USER_TOOLTIPS_PYTHON)) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_PYTHON,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Python, true);
     char *str = ui_tooltip_text_python_from_op(C, but->optype, but->opptr);
     field->text = BLI_sprintfN(TIP_("Python: %s"), str);
     MEM_freeN(str);
@@ -705,7 +699,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
 
   /* This is too handy not to expose somehow, let's be sneaky for now. */
   if ((is_label == false) && CTX_wm_window(C)->eventstate->modifier & KM_SHIFT) {
-    const char *expr_imports[] = {"bpy", "bl_ui", NULL};
+    const char *expr_imports[] = {"bpy", "bl_ui", nullptr};
     char expr[256];
     SNPRINTF(expr,
              "getattr("
@@ -721,15 +715,11 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
     if (has_valid_context == false) {
       /* pass */
     }
-    else if (BPY_run_string_as_intptr(C, expr_imports, expr, NULL, &expr_result)) {
+    else if (BPY_run_string_as_intptr(C, expr_imports, expr, nullptr, &expr_result)) {
       if (expr_result != 0) {
         {
-          uiTooltipField *field = text_field_add(data,
-                                                 &(uiTooltipFormat){
-                                                     .style = UI_TIP_STYLE_NORMAL,
-                                                     .color_id = UI_TIP_LC_NORMAL,
-                                                     .is_pad = true,
-                                                 });
+          uiTooltipField *field = text_field_add(
+              data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal, true);
           field->text = BLI_strdup("Tool Keymap:");
         }
         wmKeyMap *keymap = (wmKeyMap *)expr_result;
@@ -746,7 +736,7 @@ static uiTooltipData *ui_tooltip_data_from_tool(bContext *C, uiBut *but, bool is
 
   if (data->fields_len == 0) {
     MEM_freeN(data);
-    return NULL;
+    return nullptr;
   }
   return data;
 }
@@ -755,26 +745,26 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
                                                                 uiBut *but,
                                                                 uiButExtraOpIcon *extra_icon)
 {
-  uiStringInfo but_label = {BUT_GET_LABEL, NULL};
-  uiStringInfo but_tip = {BUT_GET_TIP, NULL};
-  uiStringInfo enum_label = {BUT_GET_RNAENUM_LABEL, NULL};
-  uiStringInfo enum_tip = {BUT_GET_RNAENUM_TIP, NULL};
-  uiStringInfo op_keymap = {BUT_GET_OP_KEYMAP, NULL};
-  uiStringInfo prop_keymap = {BUT_GET_PROP_KEYMAP, NULL};
-  uiStringInfo rna_struct = {BUT_GET_RNASTRUCT_IDENTIFIER, NULL};
-  uiStringInfo rna_prop = {BUT_GET_RNAPROP_IDENTIFIER, NULL};
+  uiStringInfo but_label = {BUT_GET_LABEL, nullptr};
+  uiStringInfo but_tip = {BUT_GET_TIP, nullptr};
+  uiStringInfo enum_label = {BUT_GET_RNAENUM_LABEL, nullptr};
+  uiStringInfo enum_tip = {BUT_GET_RNAENUM_TIP, nullptr};
+  uiStringInfo op_keymap = {BUT_GET_OP_KEYMAP, nullptr};
+  uiStringInfo prop_keymap = {BUT_GET_PROP_KEYMAP, nullptr};
+  uiStringInfo rna_struct = {BUT_GET_RNASTRUCT_IDENTIFIER, nullptr};
+  uiStringInfo rna_prop = {BUT_GET_RNAPROP_IDENTIFIER, nullptr};
 
   char buf[512];
 
   wmOperatorType *optype = extra_icon ? UI_but_extra_operator_icon_optype_get(extra_icon) :
                                         but->optype;
-  PropertyRNA *rnaprop = extra_icon ? NULL : but->rnaprop;
+  PropertyRNA *rnaprop = extra_icon ? nullptr : but->rnaprop;
 
   /* create tooltip data */
-  uiTooltipData *data = MEM_callocN(sizeof(uiTooltipData), "uiTooltipData");
+  uiTooltipData *data = MEM_cnew<uiTooltipData>(__func__);
 
   if (extra_icon) {
-    UI_but_extra_icon_string_info_get(C, extra_icon, &but_label, &but_tip, &op_keymap, NULL);
+    UI_but_extra_icon_string_info_get(C, extra_icon, &but_label, &but_tip, &op_keymap, nullptr);
   }
   else {
     UI_but_string_info_get(C,
@@ -787,30 +777,25 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
                            &prop_keymap,
                            &rna_struct,
                            &rna_prop,
-                           NULL);
+                           nullptr);
   }
 
   /* Tip Label (only for buttons not already showing the label).
    * Check prefix instead of comparing because the button may include the shortcut.
-   * Buttons with dynamic tooltips also don't get their default label here since they
-   * can already provide more accurate and specific tooltip content. */
+   * Buttons with dynamic tool-tips also don't get their default label here since they
+   * can already provide more accurate and specific tool-tip content. */
   if (but_label.strinfo && !STRPREFIX(but->drawstr, but_label.strinfo) && !but->tip_func) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_HEADER,
-                                               .color_id = UI_TIP_LC_NORMAL,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Header, uiTooltipFormat::ColorID::Normal);
+
     field->text = BLI_strdup(but_label.strinfo);
   }
 
   /* Tip */
   if (but_tip.strinfo) {
     {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_HEADER,
-                                                 .color_id = UI_TIP_LC_NORMAL,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Header, uiTooltipFormat::ColorID::Normal);
       if (enum_label.strinfo) {
         field->text = BLI_sprintfN("%s:  ", but_tip.strinfo);
         field->text_suffix = BLI_strdup(enum_label.strinfo);
@@ -822,59 +807,40 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
 
     /* special case enum rna buttons */
     if ((but->type & UI_BTYPE_ROW) && rnaprop && RNA_property_flag(rnaprop) & PROP_ENUM_FLAG) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_NORMAL,
-                                                 .color_id = UI_TIP_LC_NORMAL,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal);
       field->text = BLI_strdup(TIP_("(Shift-Click/Drag to select multiple)"));
     }
   }
-  /* Enum field label & tip */
+  /* Enum field label & tip. */
   if (enum_tip.strinfo) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_VALUE,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value);
     field->text = BLI_strdup(enum_tip.strinfo);
   }
 
-  /* Op shortcut */
+  /* Operator shortcut. */
   if (op_keymap.strinfo) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_VALUE,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
     field->text = BLI_sprintfN(TIP_("Shortcut: %s"), op_keymap.strinfo);
   }
 
-  /* Property context-toggle shortcut */
+  /* Property context-toggle shortcut. */
   if (prop_keymap.strinfo) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_VALUE,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
     field->text = BLI_sprintfN(TIP_("Shortcut: %s"), prop_keymap.strinfo);
   }
 
   if (ELEM(but->type, UI_BTYPE_TEXT, UI_BTYPE_SEARCH_MENU)) {
-    /* better not show the value of a password */
+    /* Better not show the value of a password. */
     if ((rnaprop && (RNA_property_subtype(rnaprop) == PROP_PASSWORD)) == 0) {
-      /* full string */
+      /* Full string. */
       ui_but_string_get(but, buf, sizeof(buf));
       if (buf[0]) {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_VALUE,
-                                                   .is_pad = true,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
         field->text = BLI_sprintfN(TIP_("Value: %s"), buf);
       }
     }
@@ -889,22 +855,16 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
                           RNA_property_float_get_index(&but->rnapoin, rnaprop, but->rnaindex) :
                           RNA_property_float_get(&but->rnapoin, rnaprop);
 
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_VALUE,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value);
         field->text = BLI_sprintfN(TIP_("Radians: %f"), value);
       }
     }
 
     if (but->flag & UI_BUT_DRIVEN) {
       if (ui_but_anim_expression_get(but, buf, sizeof(buf))) {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_NORMAL,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal);
         field->text = BLI_sprintfN(TIP_("Expression: %s"), buf);
       }
     }
@@ -912,64 +872,56 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
     if (but->rnapoin.owner_id) {
       const ID *id = but->rnapoin.owner_id;
       if (ID_IS_LINKED(id)) {
-        uiTooltipField *field = text_field_add(data,
-                                               &(uiTooltipFormat){
-                                                   .style = UI_TIP_STYLE_NORMAL,
-                                                   .color_id = UI_TIP_LC_NORMAL,
-                                               });
+        uiTooltipField *field = text_field_add(
+            data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal);
         field->text = BLI_sprintfN(TIP_("Library: %s"), id->lib->filepath);
       }
     }
   }
   else if (optype) {
     PointerRNA *opptr = extra_icon ? UI_but_extra_operator_icon_opptr_get(extra_icon) :
-                                     /* allocated when needed, the button owns it */
+                                     /* Allocated when needed, the button owns it. */
                                      UI_but_operator_ptr_get(but);
 
-    /* so the context is passed to fieldf functions (some py fieldf functions use it) */
+    /* So the context is passed to field functions (some Python field functions use it). */
     WM_operator_properties_sanitize(opptr, false);
 
     char *str = ui_tooltip_text_python_from_op(C, optype, opptr);
 
-    /* operator info */
+    /* Operator info. */
     if (U.flag & USER_TOOLTIPS_PYTHON) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_MONO,
-                                                 .color_id = UI_TIP_LC_PYTHON,
-                                                 .is_pad = true,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Mono, uiTooltipFormat::ColorID::Python, true);
       field->text = BLI_sprintfN(TIP_("Python: %s"), str);
     }
 
     MEM_freeN(str);
   }
 
-  /* button is disabled, we may be able to tell user why */
+  /* Button is disabled, we may be able to tell user why. */
   if ((but->flag & UI_BUT_DISABLED) || extra_icon) {
-    const char *disabled_msg = NULL;
+    const char *disabled_msg = nullptr;
     bool disabled_msg_free = false;
 
-    /* if operator poll check failed, it can give pretty precise info why */
+    /* If operator poll check failed, it can give pretty precise info why. */
     if (optype) {
       const wmOperatorCallContext opcontext = extra_icon ? extra_icon->optype_params->opcontext :
                                                            but->opcontext;
+      wmOperatorCallParams call_params{};
+      call_params.optype = optype;
+      call_params.opcontext = opcontext;
       CTX_wm_operator_poll_msg_clear(C);
-      ui_but_context_poll_operator_ex(
-          C, but, &(wmOperatorCallParams){.optype = optype, .opcontext = opcontext});
+      ui_but_context_poll_operator_ex(C, but, &call_params);
       disabled_msg = CTX_wm_operator_poll_msg_get(C, &disabled_msg_free);
     }
-    /* alternatively, buttons can store some reasoning too */
+    /* Alternatively, buttons can store some reasoning too. */
     else if (!extra_icon && but->disabled_info) {
       disabled_msg = TIP_(but->disabled_info);
     }
 
     if (disabled_msg && disabled_msg[0]) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_NORMAL,
-                                                 .color_id = UI_TIP_LC_ALERT,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Alert);
       field->text = BLI_sprintfN(TIP_("Disabled: %s"), disabled_msg);
     }
     if (disabled_msg_free) {
@@ -979,39 +931,31 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
 
   if ((U.flag & USER_TOOLTIPS_PYTHON) && !optype && rna_struct.strinfo) {
     {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_MONO,
-                                                 .color_id = UI_TIP_LC_PYTHON,
-                                                 .is_pad = true,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Mono, uiTooltipFormat::ColorID::Python, true);
       if (rna_prop.strinfo) {
         /* Struct and prop */
         field->text = BLI_sprintfN(TIP_("Python: %s.%s"), rna_struct.strinfo, rna_prop.strinfo);
       }
       else {
-        /* Only struct (e.g. menus) */
+        /* Only struct (e.g. menus). */
         field->text = BLI_sprintfN(TIP_("Python: %s"), rna_struct.strinfo);
       }
     }
 
     if (but->rnapoin.owner_id) {
-      uiTooltipField *field = text_field_add(data,
-                                             &(uiTooltipFormat){
-                                                 .style = UI_TIP_STYLE_MONO,
-                                                 .color_id = UI_TIP_LC_PYTHON,
-                                             });
+      uiTooltipField *field = text_field_add(
+          data, uiTooltipFormat::Style::Mono, uiTooltipFormat::ColorID::Python);
 
-      /* this could get its own 'BUT_GET_...' type */
+      /* This could get its own `BUT_GET_...` type. */
 
       /* never fails */
       /* Move ownership (no need for re-allocation). */
       if (rnaprop) {
-        field->text = RNA_path_full_property_py_ex(
-            CTX_data_main(C), &but->rnapoin, rnaprop, but->rnaindex, true);
+        field->text = RNA_path_full_property_py_ex(&but->rnapoin, rnaprop, but->rnaindex, true);
       }
       else {
-        field->text = RNA_path_full_struct_py(CTX_data_main(C), &but->rnapoin);
+        field->text = RNA_path_full_struct_py(&but->rnapoin);
       }
     }
   }
@@ -1044,73 +988,66 @@ static uiTooltipData *ui_tooltip_data_from_button_or_extra_icon(bContext *C,
 
   if (data->fields_len == 0) {
     MEM_freeN(data);
-    return NULL;
+    return nullptr;
   }
   return data;
 }
 
 static uiTooltipData *ui_tooltip_data_from_gizmo(bContext *C, wmGizmo *gz)
 {
-  uiTooltipData *data = MEM_callocN(sizeof(uiTooltipData), "uiTooltipData");
+  uiTooltipData *data = MEM_cnew<uiTooltipData>(__func__);
 
-  /* TODO(campbell): a way for gizmos to have their own descriptions (low priority). */
+  /* TODO(@campbellbarton): a way for gizmos to have their own descriptions (low priority). */
 
   /* Operator Actions */
   {
     const bool use_drag = gz->drag_part != -1 && gz->highlight_part != gz->drag_part;
-    const struct {
+    struct GizmoOpActions {
       int part;
       const char *prefix;
-    } gzop_actions[] = {
+    };
+    GizmoOpActions gzop_actions[] = {
         {
-            .part = gz->highlight_part,
-            .prefix = use_drag ? CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Click") : NULL,
+            gz->highlight_part,
+            use_drag ? CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Click") : nullptr,
         },
         {
-            .part = use_drag ? gz->drag_part : -1,
-            .prefix = use_drag ? CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Drag") : NULL,
+            use_drag ? gz->drag_part : -1,
+            use_drag ? CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Drag") : nullptr,
         },
     };
 
     for (int i = 0; i < ARRAY_SIZE(gzop_actions); i++) {
       wmGizmoOpElem *gzop = (gzop_actions[i].part != -1) ?
                                 WM_gizmo_operator_get(gz, gzop_actions[i].part) :
-                                NULL;
-      if (gzop != NULL) {
+                                nullptr;
+      if (gzop != nullptr) {
         /* Description */
         char *info = WM_operatortype_description_or_name(C, gzop->type, &gzop->ptr);
 
-        if (info != NULL) {
+        if (info != nullptr) {
           char *text = info;
 
-          if (gzop_actions[i].prefix != NULL) {
+          if (gzop_actions[i].prefix != nullptr) {
             text = BLI_sprintfN("%s: %s", gzop_actions[i].prefix, info);
             MEM_freeN(info);
           }
 
-          if (text != NULL) {
-            uiTooltipField *field = text_field_add(data,
-                                                   &(uiTooltipFormat){
-                                                       .style = UI_TIP_STYLE_HEADER,
-                                                       .color_id = UI_TIP_LC_VALUE,
-                                                       .is_pad = true,
-                                                   });
+          if (text != nullptr) {
+            uiTooltipField *field = text_field_add(
+                data, uiTooltipFormat::Style::Header, uiTooltipFormat::ColorID::Value, true);
             field->text = text;
           }
         }
 
         /* Shortcut */
         {
-          IDProperty *prop = gzop->ptr.data;
+          IDProperty *prop = static_cast<IDProperty *>(gzop->ptr.data);
           char buf[128];
           if (WM_key_event_operator_string(
                   C, gzop->type->idname, WM_OP_INVOKE_DEFAULT, prop, true, buf, ARRAY_SIZE(buf))) {
-            uiTooltipField *field = text_field_add(data,
-                                                   &(uiTooltipFormat){
-                                                       .style = UI_TIP_STYLE_NORMAL,
-                                                       .color_id = UI_TIP_LC_VALUE,
-                                                       .is_pad = true,
-                                                   });
+            uiTooltipField *field = text_field_add(
+                data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
             field->text = BLI_sprintfN(TIP_("Shortcut: %s"), buf);
           }
         }
@@ -1122,17 +1059,13 @@ static uiTooltipData *ui_tooltip_data_from_gizmo(bContext *C, wmGizmo *gz)
   if (gz->type->target_property_defs_len) {
     wmGizmoProperty *gz_prop_array = WM_gizmo_target_property_array(gz);
     for (int i = 0; i < gz->type->target_property_defs_len; i++) {
-      /* TODO(campbell): function callback descriptions. */
+      /* TODO(@campbellbarton): function callback descriptions. */
       wmGizmoProperty *gz_prop = &gz_prop_array[i];
-      if (gz_prop->prop != NULL) {
+      if (gz_prop->prop != nullptr) {
         const char *info = RNA_property_ui_description(gz_prop->prop);
         if (info && info[0]) {
-          uiTooltipField *field = text_field_add(data,
-                                                 &(uiTooltipFormat){
-                                                     .style = UI_TIP_STYLE_NORMAL,
-                                                     .color_id = UI_TIP_LC_VALUE,
-                                                     .is_pad = true,
-                                                 });
+          uiTooltipField *field = text_field_add(
+              data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
           field->text = BLI_strdup(info);
         }
       }
@@ -1141,7 +1074,7 @@ static uiTooltipData *ui_tooltip_data_from_gizmo(bContext *C, wmGizmo *gz)
 
   if (data->fields_len == 0) {
     MEM_freeN(data);
-    return NULL;
+    return nullptr;
   }
   return data;
 }
@@ -1160,7 +1093,7 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
   rcti rect_i;
   int font_flag = 0;
 
-  /* create area region */
+  /* Create area region. */
   ARegion *region = ui_region_temp_add(CTX_wm_screen(C));
 
   static ARegionType type;
@@ -1170,7 +1103,7 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
   type.regionid = RGN_TYPE_TEMPORARY;
   region->type = &type;
 
-  /* set font, get bb */
+  /* Set font, get bounding-box. */
   data->fstyle = style->widget; /* copy struct */
   ui_fontscale(&data->fstyle.points, aspect);
 
@@ -1184,7 +1117,7 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
   BLF_wordwrap(data->fstyle.uifont_id, data->wrap_width);
   BLF_wordwrap(blf_mono_font, data->wrap_width);
 
-  /* these defines tweaked depending on font */
+  /* These defines tweaked depending on font. */
 #define TIP_BORDER_X (16.0f / aspect)
 #define TIP_BORDER_Y (6.0f / aspect)
 
@@ -1193,18 +1126,19 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
   int i, fonth, fontw;
   for (i = 0, fontw = 0, fonth = 0; i < data->fields_len; i++) {
     uiTooltipField *field = &data->fields[i];
-    uiTooltipField *field_next = (i + 1) != data->fields_len ? &data->fields[i + 1] : NULL;
+    uiTooltipField *field_next = (i + 1) != data->fields_len ? &data->fields[i + 1] : nullptr;
 
     struct ResultBLF info;
     int w, x_pos = 0;
     int font_id;
 
-    if (field->format.style == UI_TIP_STYLE_MONO) {
+    if (field->format.style == uiTooltipFormat::Style::Mono) {
       BLF_size(blf_mono_font, data->fstyle.points * U.pixelsize, U.dpi);
       font_id = blf_mono_font;
     }
     else {
-      BLI_assert(ELEM(field->format.style, UI_TIP_STYLE_NORMAL, UI_TIP_STYLE_HEADER));
+      BLI_assert(ELEM(
+          field->format.style, uiTooltipFormat::Style::Normal, uiTooltipFormat::Style::Header));
       font_id = data->fstyle.uifont_id;
     }
     w = BLF_width_ex(font_id, field->text, UI_TIP_STR_MAX, &info);
@@ -1252,22 +1186,20 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
 
   /* Clamp to window bounds. */
   {
-    /* Ensure at least 5 px above screen bounds
-     * UI_UNIT_Y is just a guess to be above the menu item */
-    if (init_rect_overlap != NULL) {
+    /* Ensure at least 5 px above screen bounds.
+     * #UI_UNIT_Y is just a guess to be above the menu item. */
+    if (init_rect_overlap != nullptr) {
       const int pad = max_ff(1.0f, U.pixelsize) * 5;
-      const rcti init_rect = {
-          .xmin = init_rect_overlap->xmin - pad,
-          .xmax = init_rect_overlap->xmax + pad,
-          .ymin = init_rect_overlap->ymin - pad,
-          .ymax = init_rect_overlap->ymax + pad,
-      };
-      const rcti rect_clamp = {
-          .xmin = 0,
-          .xmax = winx,
-          .ymin = 0,
-          .ymax = winy,
-      };
+      rcti init_rect;
+      init_rect.xmin = init_rect_overlap->xmin - pad;
+      init_rect.xmax = init_rect_overlap->xmax + pad;
+      init_rect.ymin = init_rect_overlap->ymin - pad;
+      init_rect.ymax = init_rect_overlap->ymax + pad;
+      rcti rect_clamp;
+      rect_clamp.xmin = 0;
+      rect_clamp.xmax = winx;
+      rect_clamp.ymin = 0;
+      rect_clamp.ymax = winy;
       /* try right. */
       const int size_x = BLI_rcti_size_x(&rect_i);
       const int size_y = BLI_rcti_size_y(&rect_i);
@@ -1347,12 +1279,11 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
     }
     else {
       const int pad = max_ff(1.0f, U.pixelsize) * 5;
-      const rcti rect_clamp = {
-          .xmin = pad,
-          .xmax = winx - pad,
-          .ymin = pad + (UI_UNIT_Y * 2),
-          .ymax = winy - pad,
-      };
+      rcti rect_clamp;
+      rect_clamp.xmin = pad;
+      rect_clamp.xmax = winx - pad;
+      rect_clamp.ymin = pad + (UI_UNIT_Y * 2);
+      rect_clamp.ymax = winy - pad;
       int offset_dummy[2];
       BLI_rcti_clamp(&rect_i, &rect_clamp, offset_dummy);
     }
@@ -1367,7 +1298,7 @@ static ARegion *ui_tooltip_create_with_data(bContext *C,
   {
     /* Compensate for margin offset, visually this corrects the position. */
     const int margin = UI_POPUP_MARGIN;
-    if (init_rect_overlap != NULL) {
+    if (init_rect_overlap != nullptr) {
       BLI_rcti_translate(&rect_i, margin, margin / 2);
     }
 
@@ -1402,29 +1333,29 @@ ARegion *UI_tooltip_create_from_button_or_extra_icon(
     bContext *C, ARegion *butregion, uiBut *but, uiButExtraOpIcon *extra_icon, bool is_label)
 {
   wmWindow *win = CTX_wm_window(C);
-  /* aspect values that shrink text are likely unreadable */
+  /* Aspect values that shrink text are likely unreadable. */
   const float aspect = min_ff(1.0f, but->block->aspect);
   float init_position[2];
 
   if (but->drawflag & UI_BUT_NO_TOOLTIP) {
-    return NULL;
+    return nullptr;
   }
-  uiTooltipData *data = NULL;
+  uiTooltipData *data = nullptr;
 
-  if (data == NULL) {
+  if (data == nullptr) {
     data = ui_tooltip_data_from_tool(C, but, is_label);
   }
 
-  if (data == NULL) {
+  if (data == nullptr) {
     data = ui_tooltip_data_from_button_or_extra_icon(C, but, extra_icon);
   }
 
-  if (data == NULL) {
-    data = ui_tooltip_data_from_button_or_extra_icon(C, but, NULL);
+  if (data == nullptr) {
+    data = ui_tooltip_data_from_button_or_extra_icon(C, but, nullptr);
   }
 
-  if (data == NULL) {
-    return NULL;
+  if (data == nullptr) {
+    return nullptr;
   }
 
   const bool is_no_overlap = UI_but_has_tooltip_label(but) || UI_but_is_tool(but);
@@ -1453,31 +1384,30 @@ ARegion *UI_tooltip_create_from_button_or_extra_icon(
   }
 
   ARegion *region = ui_tooltip_create_with_data(
-      C, data, init_position, is_no_overlap ? &init_rect : NULL, aspect);
+      C, data, init_position, is_no_overlap ? &init_rect : nullptr, aspect);
 
   return region;
 }
 
 ARegion *UI_tooltip_create_from_button(bContext *C, ARegion *butregion, uiBut *but, bool is_label)
 {
-  return UI_tooltip_create_from_button_or_extra_icon(C, butregion, but, NULL, is_label);
+  return UI_tooltip_create_from_button_or_extra_icon(C, butregion, but, nullptr, is_label);
 }
 
 ARegion *UI_tooltip_create_from_gizmo(bContext *C, wmGizmo *gz)
 {
   wmWindow *win = CTX_wm_window(C);
   const float aspect = 1.0f;
-  float init_position[2] = {win->eventstate->xy[0], win->eventstate->xy[1]};
+  float init_position[2] = {static_cast<float>(win->eventstate->xy[0]),
+                            static_cast<float>(win->eventstate->xy[1])};
 
   uiTooltipData *data = ui_tooltip_data_from_gizmo(C, gz);
-  if (data == NULL) {
-    return NULL;
+  if (data == nullptr) {
+    return nullptr;
   }
 
-  /* TODO(harley):
-   * Julian preferred that the gizmo callback return the 3D bounding box
-   * which we then project to 2D here. Would make a nice improvement.
-   */
+  /* TODO(@harley): Julian preferred that the gizmo callback return the 3D bounding box
+   * which we then project to 2D here. Would make a nice improvement. */
   if (gz->type->screen_bounds_get) {
     rcti bounds;
     if (gz->type->screen_bounds_get(C, gz, &bounds)) {
@@ -1486,46 +1416,34 @@ ARegion *UI_tooltip_create_from_gizmo(bContext *C, wmGizmo *gz)
     }
   }
 
-  return ui_tooltip_create_with_data(C, data, init_position, NULL, aspect);
+  return ui_tooltip_create_with_data(C, data, init_position, nullptr, aspect);
 }
 
 static uiTooltipData *ui_tooltip_data_from_search_item_tooltip_data(
     const uiSearchItemTooltipData *item_tooltip_data)
 {
-  uiTooltipData *data = MEM_callocN(sizeof(uiTooltipData), "uiTooltipData");
+  uiTooltipData *data = MEM_cnew<uiTooltipData>(__func__);
 
   if (item_tooltip_data->description[0]) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_HEADER,
-                                               .color_id = UI_TIP_LC_NORMAL,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Header, uiTooltipFormat::ColorID::Normal, true);
     field->text = BLI_strdup(item_tooltip_data->description);
   }
 
   if (item_tooltip_data->name && item_tooltip_data->name[0]) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_VALUE,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Value, true);
     field->text = BLI_strdup(item_tooltip_data->name);
   }
   if (item_tooltip_data->hint[0]) {
-    uiTooltipField *field = text_field_add(data,
-                                           &(uiTooltipFormat){
-                                               .style = UI_TIP_STYLE_NORMAL,
-                                               .color_id = UI_TIP_LC_NORMAL,
-                                               .is_pad = true,
-                                           });
+    uiTooltipField *field = text_field_add(
+        data, uiTooltipFormat::Style::Normal, uiTooltipFormat::ColorID::Normal, true);
     field->text = BLI_strdup(item_tooltip_data->hint);
   }
 
   if (data->fields_len == 0) {
     MEM_freeN(data);
-    return NULL;
+    return nullptr;
   }
   return data;
 }
@@ -1537,8 +1455,8 @@ ARegion *UI_tooltip_create_from_search_item_generic(
     const uiSearchItemTooltipData *item_tooltip_data)
 {
   uiTooltipData *data = ui_tooltip_data_from_search_item_tooltip_data(item_tooltip_data);
-  if (data == NULL) {
-    return NULL;
+  if (data == nullptr) {
+    return nullptr;
   }
 
   const float aspect = 1.0f;
@@ -1547,7 +1465,7 @@ ARegion *UI_tooltip_create_from_search_item_generic(
   init_position[0] = win->eventstate->xy[0];
   init_position[1] = item_rect->ymin + searchbox_region->winrct.ymin - (UI_POPUP_MARGIN / 2);
 
-  return ui_tooltip_create_with_data(C, data, init_position, NULL, aspect);
+  return ui_tooltip_create_with_data(C, data, init_position, nullptr, aspect);
 }
 
 void UI_tooltip_free(bContext *C, bScreen *screen, ARegion *region)
diff --git a/source/blender/editors/interface/interface_regions.cc b/source/blender/editors/interface/interface_regions.cc
index 1a2c1f7919c..63c4a6f9c42 100644
--- a/source/blender/editors/interface/interface_regions.cc
+++ b/source/blender/editors/interface/interface_regions.cc
@@ -21,7 +21,7 @@
 
 #include "ED_screen.h"
 
-#include "interface_regions_intern.h"
+#include "interface_regions_intern.hh"
 
 ARegion *ui_region_temp_add(bScreen *screen)
 {
@@ -45,6 +45,6 @@ void ui_region_temp_remove(bContext *C, bScreen *screen, ARegion *region)
   }
 
   ED_region_exit(C, region);
-  BKE_area_region_free(nullptr, region); /* nullptr: no spacetype */
+  BKE_area_region_free(nullptr, region); /* nullptr: no space-type. */
   BLI_freelinkN(&screen->regionbase, region);
 }
diff --git a/source/blender/editors/interface/interface_regions_intern.h b/source/blender/editors/interface/interface_regions_intern.hh
index 2ed2cb3d68b..6287a031f5c 100644
--- a/source/blender/editors/interface/interface_regions_intern.h
+++ b/source/blender/editors/interface/interface_regions_intern.hh
@@ -3,23 +3,16 @@
 /** \file
  * \ingroup edinterface
  *
- * Share between interface_region_*.c files.
+ * Share between interface_region_*.cc files.
  */
 
 #pragma once
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* interface_region_menu_popup.c */
+/* interface_region_menu_popup.cc */
 
 uint ui_popup_menu_hash(const char *str);
 
-/* interface_regions_intern.h */
+/* interface_regions.cc */
+
 ARegion *ui_region_temp_add(bScreen *screen);
 void ui_region_temp_remove(struct bContext *C, bScreen *screen, ARegion *region);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/source/blender/editors/interface/interface_template_asset_view.cc b/source/blender/editors/interface/interface_template_asset_view.cc
index 8588c7cabc0..3147deb5ad1 100644
--- a/source/blender/editors/interface/interface_template_asset_view.cc
+++ b/source/blender/editors/interface/interface_template_asset_view.cc
@@ -66,7 +66,7 @@ static void asset_view_item_but_drag_set(uiBut *but,
 }
 
 static void asset_view_draw_item(uiList *ui_list,
-                                 bContext *UNUSED(C),
+                                 const bContext *UNUSED(C),
                                  uiLayout *layout,
                                  PointerRNA *UNUSED(dataptr),
                                  PointerRNA *itemptr,
@@ -183,7 +183,7 @@ static void asset_view_template_refresh_asset_collection(
 }
 
 void uiTemplateAssetView(uiLayout *layout,
-                         bContext *C,
+                         const bContext *C,
                          const char *list_id,
                          PointerRNA *asset_library_dataptr,
                          const char *asset_library_propname,
diff --git a/source/blender/editors/interface/interface_template_attribute_search.cc b/source/blender/editors/interface/interface_template_attribute_search.cc
index 0a684903f0f..55ca945671f 100644
--- a/source/blender/editors/interface/interface_template_attribute_search.cc
+++ b/source/blender/editors/interface/interface_template_attribute_search.cc
@@ -14,13 +14,15 @@
 
 #include "BLT_translation.h"
 
-#include "NOD_geometry_nodes_eval_log.hh"
+#include "BKE_attribute.hh"
+
+#include "NOD_geometry_nodes_log.hh"
 
 #include "UI_interface.h"
 #include "UI_interface.hh"
 #include "UI_resources.h"
 
-using blender::nodes::geometry_nodes_eval_log::GeometryAttributeInfo;
+using blender::nodes::geo_eval_log::GeometryAttributeInfo;
 
 namespace blender::ui {
 
diff --git a/source/blender/editors/interface/interface_template_list.cc b/source/blender/editors/interface/interface_template_list.cc
index e0b6bbb34c4..d8a9591a021 100644
--- a/source/blender/editors/interface/interface_template_list.cc
+++ b/source/blender/editors/interface/interface_template_list.cc
@@ -83,7 +83,7 @@ struct TemplateListVisualInfo {
 };
 
 static void uilist_draw_item_default(struct uiList *ui_list,
-                                     struct bContext *UNUSED(C),
+                                     const struct bContext *UNUSED(C),
                                      struct uiLayout *layout,
                                      struct PointerRNA *UNUSED(dataptr),
                                      struct PointerRNA *itemptr,
@@ -114,7 +114,7 @@ static void uilist_draw_item_default(struct uiList *ui_list,
 }
 
 static void uilist_draw_filter_default(struct uiList *ui_list,
-                                       struct bContext *UNUSED(C),
+                                       const struct bContext *UNUSED(C),
                                        struct uiLayout *layout)
 {
   PointerRNA listptr;
@@ -160,7 +160,7 @@ static int cmpstringp(const void *p1, const void *p2)
 }
 
 static void uilist_filter_items_default(struct uiList *ui_list,
-                                        struct bContext *UNUSED(C),
+                                        const struct bContext *UNUSED(C),
                                         struct PointerRNA *dataptr,
                                         const char *propname)
 {
@@ -434,7 +434,7 @@ static void ui_template_list_collect_items(PointerRNA *list_ptr,
 /**
  * Create the UI-list representation of the list items, sorted and filtered if needed.
  */
-static void ui_template_list_collect_display_items(bContext *C,
+static void ui_template_list_collect_display_items(const bContext *C,
                                                    uiList *ui_list,
                                                    TemplateListInputData *input_data,
                                                    const uiListFilterItemsFunc filter_items_fn,
@@ -601,7 +601,7 @@ static char *uilist_item_tooltip_func(bContext *UNUSED(C), void *argN, const cha
 /**
  * \note that \a layout_type may be null.
  */
-static uiList *ui_list_ensure(bContext *C,
+static uiList *ui_list_ensure(const bContext *C,
                               uiListType *ui_list_type,
                               const char *list_id,
                               int layout_type,
@@ -656,7 +656,7 @@ static uiList *ui_list_ensure(bContext *C,
   return ui_list;
 }
 
-static void ui_template_list_layout_draw(bContext *C,
+static void ui_template_list_layout_draw(const bContext *C,
                                          uiList *ui_list,
                                          uiLayout *layout,
                                          TemplateListInputData *input_data,
@@ -767,7 +767,7 @@ static void ui_template_list_layout_draw(bContext *C,
         uiItemL(col, "", ICON_NONE);
       }
 
-      /* add scrollbar */
+      /* Add scroll-bar. */
       if (items->tot_items > visual_info.visual_items) {
         uiLayoutColumn(row, false);
         uiDefButI(block,
@@ -916,7 +916,7 @@ static void ui_template_list_layout_draw(bContext *C,
         uiItemL(subrow, "", ICON_NONE);
       }
 
-      /* add scrollbar */
+      /* Add scroll-bar. */
       if (items->tot_items > visual_info.visual_items) {
         /* col = */ uiLayoutColumn(row, false);
         uiDefButI(block,
@@ -940,7 +940,7 @@ static void ui_template_list_layout_draw(bContext *C,
       box = uiLayoutListBox(layout, ui_list, &input_data->active_dataptr, input_data->activeprop);
       /* For grip button. */
       glob = uiLayoutColumn(box, true);
-      /* For scrollbar. */
+      /* For scroll-bar. */
       row = uiLayoutRow(glob, false);
 
       const bool show_names = (flags & UI_TEMPLATE_LIST_NO_NAMES) == 0;
@@ -1156,7 +1156,7 @@ static void ui_template_list_layout_draw(bContext *C,
 }
 
 uiList *uiTemplateList_ex(uiLayout *layout,
-                          bContext *C,
+                          const bContext *C,
                           const char *listtype_name,
                           const char *list_id,
                           PointerRNA *dataptr,
@@ -1227,7 +1227,7 @@ uiList *uiTemplateList_ex(uiLayout *layout,
 }
 
 void uiTemplateList(uiLayout *layout,
-                    bContext *C,
+                    const bContext *C,
                     const char *listtype_name,
                     const char *list_id,
                     PointerRNA *dataptr,
diff --git a/source/blender/editors/interface/interface_template_search_menu.cc b/source/blender/editors/interface/interface_template_search_menu.cc
index c3021028b97..c777b7834f2 100644
--- a/source/blender/editors/interface/interface_template_search_menu.cc
+++ b/source/blender/editors/interface/interface_template_search_menu.cc
@@ -918,6 +918,7 @@ static void menu_search_arg_free_fn(void *data_v)
           WM_operator_properties_free(item->op.opptr);
           MEM_freeN(item->op.opptr);
         }
+        break;
       }
       case MenuSearch_Item::Type::RNA: {
         break;
diff --git a/source/blender/editors/interface/interface_template_search_operator.c b/source/blender/editors/interface/interface_template_search_operator.cc
index 41de2ab197d..0d0a5f01744 100644
--- a/source/blender/editors/interface/interface_template_search_operator.c
+++ b/source/blender/editors/interface/interface_template_search_operator.cc
@@ -7,14 +7,15 @@
  * accessed via the #WM_OT_search_operator operator.
  */
 
-#include <string.h>
+#include <cstring>
 
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_texture_types.h"
 
-#include "BLI_alloca.h"
+#include "BLI_array.hh"
 #include "BLI_ghash.h"
+#include "BLI_math_vec_types.hh"
 #include "BLI_string.h"
 #include "BLI_utildefines.h"
 
@@ -35,10 +36,10 @@
 
 static void operator_search_exec_fn(bContext *C, void *UNUSED(arg1), void *arg2)
 {
-  wmOperatorType *ot = arg2;
+  wmOperatorType *ot = static_cast<wmOperatorType *>(arg2);
 
   if (ot) {
-    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, NULL, NULL);
+    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, nullptr, nullptr);
   }
 }
 
@@ -53,19 +54,20 @@ static void operator_search_update_fn(const bContext *C,
   /* Prepare BLI_string_all_words_matched. */
   const size_t str_len = strlen(str);
   const int words_max = BLI_string_max_possible_word_count(str_len);
-  int(*words)[2] = BLI_array_alloca(words, words_max);
-  const int words_len = BLI_string_find_split_words(str, str_len, ' ', words, words_max);
+  blender::Array<blender::int2> words(words_max);
+  const int words_len = BLI_string_find_split_words(
+      str, str_len, ' ', (int(*)[2])words.data(), words_max);
 
   for (WM_operatortype_iter(&iter); !BLI_ghashIterator_done(&iter);
        BLI_ghashIterator_step(&iter)) {
-    wmOperatorType *ot = BLI_ghashIterator_getValue(&iter);
+    wmOperatorType *ot = static_cast<wmOperatorType *>(BLI_ghashIterator_getValue(&iter));
     const char *ot_ui_name = CTX_IFACE_(ot->translation_context, ot->name);
 
     if ((ot->flag & OPTYPE_INTERNAL) && (G.debug & G_DEBUG_WM) == 0) {
       continue;
     }
 
-    if (BLI_string_all_words_matched(ot_ui_name, str, words, words_len)) {
+    if (BLI_string_all_words_matched(ot_ui_name, str, (int(*)[2])words.data(), words_len)) {
       if (WM_operator_poll((bContext *)C, ot)) {
         char name[256];
         const int len = strlen(ot_ui_name);
@@ -78,7 +80,7 @@ static void operator_search_update_fn(const bContext *C,
           if (WM_key_event_operator_string(C,
                                            ot->idname,
                                            WM_OP_EXEC_DEFAULT,
-                                           NULL,
+                                           nullptr,
                                            true,
                                            &name[len + 1],
                                            sizeof(name) - len - 1)) {
@@ -105,11 +107,11 @@ void UI_but_func_operator_search(uiBut *but)
   UI_but_func_search_set(but,
                          ui_searchbox_create_operator,
                          operator_search_update_fn,
-                         NULL,
+                         nullptr,
                          false,
-                         NULL,
+                         nullptr,
                          operator_search_exec_fn,
-                         NULL);
+                         nullptr);
 }
 
 void uiTemplateOperatorSearch(uiLayout *layout)
diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index 14da5a7cd62..0b72c358dc9 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -571,8 +571,11 @@ static uiBlock *id_search_menu(bContext *C, ARegion *region, void *arg_litem)
 /** \name ID Template
  * \{ */
 
-/* This is for browsing and editing the ID-blocks used */
+static void template_id_cb(bContext *C, void *arg_litem, void *arg_event);
 
+/**
+ * This is for browsing and editing the ID-blocks used.
+ */
 void UI_context_active_but_prop_get_templateID(bContext *C,
                                                PointerRNA *r_ptr,
                                                PropertyRNA **r_prop)
@@ -582,7 +585,7 @@ void UI_context_active_but_prop_get_templateID(bContext *C,
   memset(r_ptr, 0, sizeof(*r_ptr));
   *r_prop = NULL;
 
-  if (but && but->func_argN) {
+  if (but && (but->funcN == template_id_cb) && but->func_argN) {
     TemplateID *template_ui = but->func_argN;
     *r_ptr = template_ui->ptr;
     *r_prop = template_ui->prop;
@@ -650,20 +653,41 @@ static void template_id_liboverride_hierarchy_collections_tag_recursive(
   }
 }
 
-static void template_id_liboverride_hierarchy_create(bContext *C,
-                                                     Main *bmain,
-                                                     TemplateID *template_ui,
-                                                     PointerRNA *idptr,
-                                                     const char **r_undo_push_label)
+ID *ui_template_id_liboverride_hierarchy_make(
+    bContext *C, Main *bmain, ID *owner_id, ID *id, const char **r_undo_push_label)
 {
-  ID *id = idptr->data;
-  ID *owner_id = template_ui->ptr.owner_id;
+  const char *undo_push_label;
+  if (r_undo_push_label == NULL) {
+    r_undo_push_label = &undo_push_label;
+  }
+
+  /* If this is called on an already local override, 'toggle' between user-editable state, and
+   * system override with reset. */
+  if (!ID_IS_LINKED(id) && ID_IS_OVERRIDE_LIBRARY(id)) {
+    if (!ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
+      BKE_lib_override_library_get(bmain, id, NULL, &id);
+    }
+    if (id->override_library->flag & IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED) {
+      id->override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
+      *r_undo_push_label = "Make Library Override Hierarchy Editable";
+    }
+    else {
+      BKE_lib_override_library_id_reset(bmain, id, true);
+      *r_undo_push_label = "Clear Library Override Hierarchy";
+    }
+
+    WM_event_add_notifier(C, NC_WM | ND_DATACHANGED, NULL);
+    WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, NULL);
+    return id;
+  }
 
   /* Attempt to perform a hierarchy override, based on contextual data available.
    * NOTE: do not attempt to perform such hierarchy override at all cost, if there is not enough
    * context, better to abort than create random overrides all over the place. */
   if (!ID_IS_OVERRIDABLE_LIBRARY_HIERARCHY(id)) {
-    return;
+    RNA_warning("The data-block %s is not overridable", id->name);
+    return NULL;
   }
 
   Object *object_active = CTX_data_active_object(C);
@@ -741,15 +765,8 @@ static void template_id_liboverride_hierarchy_create(bContext *C,
         if (object_active != NULL) {
           object_active->id.tag |= LIB_TAG_DOIT;
         }
-        BKE_lib_override_library_create(bmain,
-                                        scene,
-                                        view_layer,
-                                        NULL,
-                                        id,
-                                        &collection_active->id,
-                                        NULL,
-                                        &id_override,
-                                        U.experimental.use_override_new_fully_editable);
+        BKE_lib_override_library_create(
+            bmain, scene, view_layer, NULL, id, &collection_active->id, NULL, &id_override, false);
       }
       else if (object_active != NULL && !ID_IS_LINKED(object_active) &&
                &object_active->instance_collection->id == id) {
@@ -762,7 +779,7 @@ static void template_id_liboverride_hierarchy_create(bContext *C,
                                         &object_active->id,
                                         &object_active->id,
                                         &id_override,
-                                        U.experimental.use_override_new_fully_editable);
+                                        false);
       }
       break;
     case ID_OB:
@@ -772,15 +789,17 @@ static void template_id_liboverride_hierarchy_create(bContext *C,
         if (object_active != NULL) {
           object_active->id.tag |= LIB_TAG_DOIT;
         }
-        BKE_lib_override_library_create(bmain,
-                                        scene,
-                                        view_layer,
-                                        NULL,
-                                        id,
-                                        &collection_active->id,
-                                        NULL,
-                                        &id_override,
-                                        U.experimental.use_override_new_fully_editable);
+        BKE_lib_override_library_create(
+            bmain, scene, view_layer, NULL, id, &collection_active->id, NULL, &id_override, false);
+      }
+      else {
+        if (object_active != NULL) {
+          object_active->id.tag |= LIB_TAG_DOIT;
+        }
+        BKE_lib_override_library_create(
+            bmain, scene, view_layer, NULL, id, NULL, NULL, &id_override, false);
+        BKE_scene_collections_object_remove(bmain, scene, (Object *)id, true);
+        WM_event_add_notifier(C, NC_ID | NA_REMOVED, NULL);
       }
       break;
     case ID_ME:
@@ -795,7 +814,8 @@ static void template_id_liboverride_hierarchy_create(bContext *C,
     case ID_CV:
     case ID_PT:
     case ID_VO:
-      if (object_active != NULL && object_active->data == id) {
+    case ID_NT: /* Essentially geometry nodes from modifier currently. */
+      if (object_active != NULL) {
         if (collection_active != NULL &&
             BKE_collection_has_object_recursive(collection_active, object_active)) {
           template_id_liboverride_hierarchy_collections_tag_recursive(collection_active, id, true);
@@ -810,42 +830,74 @@ static void template_id_liboverride_hierarchy_create(bContext *C,
                                           &collection_active->id,
                                           NULL,
                                           &id_override,
-                                          U.experimental.use_override_new_fully_editable);
+                                          false);
         }
         else {
           object_active->id.tag |= LIB_TAG_DOIT;
-          BKE_lib_override_library_create(bmain,
-                                          scene,
-                                          view_layer,
-                                          NULL,
-                                          id,
-                                          &object_active->id,
-                                          NULL,
-                                          &id_override,
-                                          U.experimental.use_override_new_fully_editable);
+          BKE_lib_override_library_create(
+              bmain, scene, view_layer, NULL, id, &object_active->id, NULL, &id_override, false);
         }
       }
       break;
     case ID_MA:
     case ID_TE:
     case ID_IM:
+      RNA_warning("The type of data-block %s could not yet implemented", id->name);
       break;
     case ID_WO:
+      RNA_warning("The type of data-block %s could not yet implemented", id->name);
       break;
     case ID_PA:
+      RNA_warning("The type of data-block %s could not yet implemented", id->name);
       break;
     default:
+      RNA_warning("The type of data-block %s could not yet implemented", id->name);
       break;
   }
   if (id_override != NULL) {
     id_override->override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
     *r_undo_push_label = "Make Library Override Hierarchy";
 
-    /* Given `idptr` is re-assigned to owner property by caller to ensure proper updates etc. Here
-     * we also use it to ensure remapping of the owner property from the linked data to the newly
-     * created liboverride (note that in theory this remapping has already been done by code
-     * above). */
-    RNA_id_pointer_create(id_override, idptr);
+    /* In theory we could rely on setting/updating the RNA ID pointer property (as done by calling
+     * code) to be enough.
+     *
+     * However, some rare ID pointers properties (like the 'active object in viewlayer' one used
+     * for the Object templateID in the Object properties) use notifiers that do not enforce a
+     * rebuild of outliner trees, leading to crashes.
+     *
+     * So for now, add some extra notifiers here. */
+    WM_event_add_notifier(C, NC_ID | NA_ADDED, NULL);
+    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_OUTLINER, NULL);
+  }
+  return id_override;
+}
+
+static void template_id_liboverride_hierarchy_make(bContext *C,
+                                                   Main *bmain,
+                                                   TemplateID *template_ui,
+                                                   PointerRNA *idptr,
+                                                   const char **r_undo_push_label)
+{
+  ID *id = idptr->data;
+  ID *owner_id = template_ui->ptr.owner_id;
+
+  ID *id_override = ui_template_id_liboverride_hierarchy_make(
+      C, bmain, owner_id, id, r_undo_push_label);
+
+  if (id_override != NULL) {
+    /* `idptr` is re-assigned to owner property to ensure proper updates etc. Here we also use it
+     * to ensure remapping of the owner property from the linked data to the newly created
+     * liboverride (note that in theory this remapping has already been done by code above), but
+     * only in case owner ID was already local ID (override or pure local data).
+     *
+     * Otherwise, owner ID will also have been overridden, and remapped already to use it's
+     * override of the data too. */
+    if (!ID_IS_LINKED(owner_id)) {
+      RNA_id_pointer_create(id_override, idptr);
+    }
+  }
+  else {
+    RNA_warning("The data-block %s could not be overridden", id->name);
   }
 }
 
@@ -898,8 +950,7 @@ static void template_id_cb(bContext *C, void *arg_litem, void *arg_event)
       if (id) {
         Main *bmain = CTX_data_main(C);
         if (CTX_wm_window(C)->eventstate->modifier & KM_SHIFT) {
-          template_id_liboverride_hierarchy_create(
-              C, bmain, template_ui, &idptr, &undo_push_label);
+          template_id_liboverride_hierarchy_make(C, bmain, template_ui, &idptr, &undo_push_label);
         }
         else {
           if (BKE_lib_id_make_local(bmain, id, 0)) {
@@ -918,12 +969,18 @@ static void template_id_cb(bContext *C, void *arg_litem, void *arg_event)
       break;
     case UI_ID_OVERRIDE:
       if (id && ID_IS_OVERRIDE_LIBRARY(id)) {
-        BKE_lib_override_library_make_local(id);
-        /* Reassign to get proper updates/notifiers. */
-        idptr = RNA_property_pointer_get(&template_ui->ptr, template_ui->prop);
-        RNA_property_pointer_set(&template_ui->ptr, template_ui->prop, idptr, NULL);
-        RNA_property_update(C, &template_ui->ptr, template_ui->prop);
-        undo_push_label = "Make Local";
+        Main *bmain = CTX_data_main(C);
+        if (CTX_wm_window(C)->eventstate->modifier & KM_SHIFT) {
+          template_id_liboverride_hierarchy_make(C, bmain, template_ui, &idptr, &undo_push_label);
+        }
+        else {
+          BKE_lib_override_library_make_local(id);
+          /* Reassign to get proper updates/notifiers. */
+          idptr = RNA_property_pointer_get(&template_ui->ptr, template_ui->prop);
+          RNA_property_pointer_set(&template_ui->ptr, template_ui->prop, idptr, NULL);
+          RNA_property_update(C, &template_ui->ptr, template_ui->prop);
+          undo_push_label = "Make Local";
+        }
       }
       break;
     case UI_ID_ALONE:
@@ -1308,20 +1365,22 @@ static void template_ID(const bContext *C,
       }
     }
     else if (ID_IS_OVERRIDE_LIBRARY(id)) {
-      but = uiDefIconBut(block,
-                         UI_BTYPE_BUT,
-                         0,
-                         ICON_LIBRARY_DATA_OVERRIDE,
-                         0,
-                         0,
-                         UI_UNIT_X,
-                         UI_UNIT_Y,
-                         NULL,
-                         0,
-                         0,
-                         0,
-                         0,
-                         TIP_("Library override of linked data-block, click to make fully local"));
+      but = uiDefIconBut(
+          block,
+          UI_BTYPE_BUT,
+          0,
+          ICON_LIBRARY_DATA_OVERRIDE,
+          0,
+          0,
+          UI_UNIT_X,
+          UI_UNIT_Y,
+          NULL,
+          0,
+          0,
+          0,
+          0,
+          TIP_("Library override of linked data-block, click to make fully local, "
+               "Shift + Click to clear the library override and toggle if it can be edited"));
       UI_but_funcN_set(
           but, template_id_cb, MEM_dupallocN(template_ui), POINTER_FROM_INT(UI_ID_OVERRIDE));
     }
@@ -5147,7 +5206,7 @@ static void CurveProfile_buttons_layout(uiLayout *layout, PointerRNA *ptr, RNAUp
                             0.0,
                             0.0,
                             0.0,
-                            "Reapply and update the preset, removing changes");
+                            TIP_("Reapply and update the preset, removing changes"));
       UI_but_funcN_set(bt, CurveProfile_buttons_reset, MEM_dupallocN(cb), profile);
     }
   }
@@ -6272,7 +6331,7 @@ void uiTemplateReportsBanner(uiLayout *layout, bContext *C)
                   0,
                   width + UI_UNIT_X,
                   UI_UNIT_Y,
-                  "Show in Info Log");
+                  TIP_("Show in Info Log"));
 
   UI_block_emboss_set(block, previous_emboss);
 }
@@ -6299,8 +6358,10 @@ void uiTemplateInputStatus(uiLayout *layout, struct bContext *C)
     uiLayout *row = uiLayoutRow(col, true);
     uiLayoutSetAlignment(row, UI_LAYOUT_ALIGN_LEFT);
 
-    const char *msg = TIP_(WM_window_cursor_keymap_status_get(win, i, 0));
-    const char *msg_drag = TIP_(WM_window_cursor_keymap_status_get(win, i, 1));
+    const char *msg = CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT,
+                               WM_window_cursor_keymap_status_get(win, i, 0));
+    const char *msg_drag = CTX_TIP_(BLT_I18NCONTEXT_OPERATOR_DEFAULT,
+                                    WM_window_cursor_keymap_status_get(win, i, 1));
 
     if (msg || (msg_drag == NULL)) {
       uiItemL(row, msg ? msg : "", (ICON_MOUSE_LMB + i));
@@ -6430,13 +6491,13 @@ bool uiTemplateEventFromKeymapItem(struct uiLayout *layout,
     for (int j = 0; j < ARRAY_SIZE(icon_mod) && icon_mod[j]; j++) {
       uiItemL(layout, "", icon_mod[j]);
     }
-    uiItemL(layout, text, icon);
+    uiItemL(layout, CTX_TIP_(BLT_I18NCONTEXT_ID_WINDOWMANAGER, text), icon);
     ok = true;
   }
   else if (text_fallback) {
     const char *event_text = WM_key_event_string(kmi->type, true);
     uiItemL(layout, event_text, ICON_NONE);
-    uiItemL(layout, text, ICON_NONE);
+    uiItemL(layout, CTX_TIP_(BLT_I18NCONTEXT_ID_WINDOWMANAGER, text), ICON_NONE);
     ok = true;
   }
   return ok;
@@ -6674,7 +6735,7 @@ void uiTemplateCacheFileTimeSettings(uiLayout *layout, PointerRNA *fileptr)
 }
 
 static void cache_file_layer_item(uiList *UNUSED(ui_list),
-                                  bContext *UNUSED(C),
+                                  const bContext *UNUSED(C),
                                   uiLayout *layout,
                                   PointerRNA *UNUSED(dataptr),
                                   PointerRNA *itemptr,
diff --git a/source/blender/editors/interface/interface_undo.c b/source/blender/editors/interface/interface_undo.cc
index e998eb6dbed..ec54b695cf7 100644
--- a/source/blender/editors/interface/interface_undo.c
+++ b/source/blender/editors/interface/interface_undo.cc
@@ -7,7 +7,7 @@
  * Undo stack to use for UI widgets that manage their own editing state.
  */
 
-#include <string.h>
+#include <cstring>
 
 #include "BLI_listbase.h"
 
@@ -21,39 +21,39 @@
 /** \name Text Field Undo Stack
  * \{ */
 
-typedef struct uiUndoStack_Text_State {
+struct uiUndoStack_Text_State {
   struct uiUndoStack_Text_State *next, *prev;
   int cursor_index;
   char text[0];
-} uiUndoStack_Text_State;
+};
 
-typedef struct uiUndoStack_Text {
+struct uiUndoStack_Text {
   ListBase states;
   uiUndoStack_Text_State *current;
-} uiUndoStack_Text;
+};
 
 static const char *ui_textedit_undo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
 {
   /* Don't undo if no data has been pushed yet. */
-  if (stack->current == NULL) {
-    return NULL;
+  if (stack->current == nullptr) {
+    return nullptr;
   }
 
   /* Travel backwards in the stack and copy information to the caller. */
-  if (stack->current->prev != NULL) {
+  if (stack->current->prev != nullptr) {
     stack->current = stack->current->prev;
 
     *r_cursor_index = stack->current->cursor_index;
     return stack->current->text;
   }
-  return NULL;
+  return nullptr;
 }
 
 static const char *ui_textedit_redo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
 {
   /* Don't redo if no data has been pushed yet. */
-  if (stack->current == NULL) {
-    return NULL;
+  if (stack->current == nullptr) {
+    return nullptr;
   }
 
   /* Only redo if new data has not been entered since the last undo. */
@@ -63,7 +63,7 @@ static const char *ui_textedit_redo_impl(uiUndoStack_Text *stack, int *r_cursor_
     *r_cursor_index = stack->current->cursor_index;
     return stack->current->text;
   }
-  return NULL;
+  return nullptr;
 }
 
 const char *ui_textedit_undo(uiUndoStack_Text *stack, int direction, int *r_cursor_index)
@@ -78,7 +78,7 @@ const char *ui_textedit_undo(uiUndoStack_Text *stack, int direction, int *r_curs
 void ui_textedit_undo_push(uiUndoStack_Text *stack, const char *text, int cursor_index)
 {
   /* Clear all redo actions from the current state. */
-  if (stack->current != NULL) {
+  if (stack->current != nullptr) {
     while (stack->current->next) {
       uiUndoStack_Text_State *state = stack->current->next;
       BLI_remlink(&stack->states, state);
@@ -88,7 +88,8 @@ void ui_textedit_undo_push(uiUndoStack_Text *stack, const char *text, int cursor
 
   /* Create the new state. */
   const int text_size = strlen(text) + 1;
-  stack->current = MEM_mallocN(sizeof(uiUndoStack_Text_State) + text_size, __func__);
+  stack->current = static_cast<uiUndoStack_Text_State *>(
+      MEM_mallocN(sizeof(uiUndoStack_Text_State) + text_size, __func__));
   stack->current->cursor_index = cursor_index;
   memcpy(stack->current->text, text, text_size);
   BLI_addtail(&stack->states, stack->current);
@@ -96,8 +97,8 @@ void ui_textedit_undo_push(uiUndoStack_Text *stack, const char *text, int cursor
 
 uiUndoStack_Text *ui_textedit_undo_stack_create(void)
 {
-  uiUndoStack_Text *stack = MEM_mallocN(sizeof(uiUndoStack_Text), __func__);
-  stack->current = NULL;
+  uiUndoStack_Text *stack = MEM_new<uiUndoStack_Text>(__func__);
+  stack->current = nullptr;
   BLI_listbase_clear(&stack->states);
 
   return stack;
diff --git a/source/blender/editors/interface/interface_utils.cc b/source/blender/editors/interface/interface_utils.cc
index b7ca2d9aa11..4b94834ce97 100644
--- a/source/blender/editors/interface/interface_utils.cc
+++ b/source/blender/editors/interface/interface_utils.cc
@@ -787,7 +787,7 @@ int UI_calc_float_precision(int prec, double value)
    */
   value = fabs(value);
   if ((value < pow10_neg[prec]) && (value > (1.0 / max_pow))) {
-    int value_i = (int)((value * max_pow) + 0.5);
+    int value_i = (int)lround(value * max_pow);
     if (value_i != 0) {
       const int prec_span = 3; /* show: 0.01001, 5 would allow 0.0100001 for eg. */
       int test_prec;
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index e2df2d77817..53b1967d668 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -104,8 +104,7 @@ typedef enum {
   UI_WTYPE_LISTITEM,
   UI_WTYPE_PROGRESSBAR,
   UI_WTYPE_NODESOCKET,
-  UI_WTYPE_TREEROW,
-  UI_WTYPE_GRID_TILE,
+  UI_WTYPE_VIEW_ITEM,
 } uiWidgetTypeEnum;
 
 /**
@@ -534,7 +533,7 @@ static void draw_anti_tria(
 
   const uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4fv(draw_color);
   immBegin(GPU_PRIM_TRIS, 3 * WIDGET_AA_JITTER);
@@ -1525,11 +1524,6 @@ float UI_text_clip_middle_ex(const uiFontStyle *fstyle,
                              const size_t max_len,
                              const char rpart_sep)
 {
-  /* Add some epsilon to OK width, avoids 'ellipsing' text that nearly fits!
-   * Better to have a small piece of the last char cut out,
-   * than two remaining chars replaced by an ellipsis... */
-  okwidth += 1.0f + UI_DPI_FAC;
-
   BLI_assert(str[0]);
 
   /* need to set this first */
@@ -1628,7 +1622,7 @@ float UI_text_clip_middle_ex(const uiFontStyle *fstyle,
     strwidth = BLF_width(fstyle->uifont_id, str, max_len);
   }
 
-  BLI_assert(strwidth <= okwidth);
+  BLI_assert((strwidth <= okwidth) || (okwidth <= 0.0f));
 
   return strwidth;
 }
@@ -1985,7 +1979,7 @@ static void widget_draw_text(const uiFontStyle *fstyle,
 
         uint pos = GPU_vertformat_attr_add(
             immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
         rcti selection_shape;
         selection_shape.xmin = rect->xmin + selsta_draw;
@@ -2037,7 +2031,7 @@ static void widget_draw_text(const uiFontStyle *fstyle,
 
       uint pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       immUniformThemeColor(TH_WIDGET_TEXT_CURSOR);
 
@@ -2780,7 +2774,7 @@ static void widget_softshadow(const rcti *rect, int roundboxalign, const float r
   const uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   for (int step = 1; step <= (int)radout; step++) {
     const float expfac = sqrtf(step / radout);
@@ -2836,7 +2830,7 @@ static void ui_hsv_cursor(const float x, const float y, const float zoom)
   const uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3f(1.0f, 1.0f, 1.0f);
   imm_draw_circle_fill_2d(pos, x, y, radius, 8);
@@ -2936,7 +2930,7 @@ static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint color = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRI_FAN, tot + 2);
   immAttr3fv(color, rgb_center);
@@ -2970,7 +2964,7 @@ static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const
   format = immVertexFormat();
   pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_blend(GPU_BLEND_ALPHA);
   GPU_line_smooth(true);
@@ -3067,7 +3061,7 @@ void ui_draw_gradient(const rcti *rect,
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
   immBegin(GPU_PRIM_TRIS, steps * 3 * 6);
 
@@ -3232,7 +3226,7 @@ static void ui_draw_but_HSVCUBE(uiBut *but, const rcti *rect)
   /* outline */
   const uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3ub(0, 0, 0);
   imm_draw_box_wire_2d(pos, (rect->xmin), (rect->ymin), (rect->xmax), (rect->ymax));
   immUnbindProgram();
@@ -3308,7 +3302,7 @@ static void ui_draw_separator(const rcti *rect, const uiWidgetColors *wcol)
 
   const uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_blend(GPU_BLEND_ALPHA);
   immUniformColor4ubv(col);
@@ -3672,12 +3666,11 @@ static void widget_progressbar(uiBut *but,
   widgetbase_draw(&wtb_bar, wcol);
 }
 
-static void widget_treerow_exec(uiWidgetColors *wcol,
-                                rcti *rect,
-                                const uiWidgetStateInfo *state,
-                                int UNUSED(roundboxalign),
-                                int indentation,
-                                const float zoom)
+static void widget_view_item(uiWidgetColors *wcol,
+                             rcti *rect,
+                             const uiWidgetStateInfo *state,
+                             int UNUSED(roundboxalign),
+                             const float zoom)
 {
   uiWidgetBase wtb;
   widget_init(&wtb);
@@ -3690,31 +3683,6 @@ static void widget_treerow_exec(uiWidgetColors *wcol,
   if ((state->but_flag & UI_ACTIVE) || (state->but_flag & UI_SELECT)) {
     widgetbase_draw(&wtb, wcol);
   }
-
-  BLI_rcti_resize(rect, BLI_rcti_size_x(rect) - UI_UNIT_X * indentation, BLI_rcti_size_y(rect));
-  BLI_rcti_translate(rect, 0.5f * UI_UNIT_X * indentation, 0);
-}
-
-static void widget_treerow(uiBut *but,
-                           uiWidgetColors *wcol,
-                           rcti *rect,
-                           const uiWidgetStateInfo *state,
-                           int roundboxalign,
-                           const float zoom)
-{
-  uiButTreeRow *tree_row = (uiButTreeRow *)but;
-  BLI_assert(but->type == UI_BTYPE_TREEROW);
-  widget_treerow_exec(wcol, rect, state, roundboxalign, tree_row->indentation, zoom);
-}
-
-static void widget_gridtile(uiWidgetColors *wcol,
-                            rcti *rect,
-                            const uiWidgetStateInfo *state,
-                            int roundboxalign,
-                            const float zoom)
-{
-  /* TODO Reuse tree-row drawing. */
-  widget_treerow_exec(wcol, rect, state, roundboxalign, 0, zoom);
 }
 
 static void widget_nodesocket(uiBut *but,
@@ -3949,7 +3917,7 @@ static void widget_swatch(uiBut *but,
 
     const uint pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformColor3f(bw, bw, bw);
     immBegin(GPU_PRIM_TRIS, 3);
@@ -4415,7 +4383,7 @@ static void widget_draw_extra_mask(const bContext *C, uiBut *but, uiWidgetType *
 
     const uint pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* make mask to draw over image */
     uchar col[4];
@@ -4608,14 +4576,9 @@ static uiWidgetType *widget_type(uiWidgetTypeEnum type)
       wt.custom = widget_progressbar;
       break;
 
-    case UI_WTYPE_TREEROW:
-      wt.wcol_theme = &btheme->tui.wcol_view_item;
-      wt.custom = widget_treerow;
-      break;
-
-    case UI_WTYPE_GRID_TILE:
+    case UI_WTYPE_VIEW_ITEM:
       wt.wcol_theme = &btheme->tui.wcol_view_item;
-      wt.draw = widget_gridtile;
+      wt.draw = widget_view_item;
       break;
 
     case UI_WTYPE_NODESOCKET:
@@ -4949,13 +4912,8 @@ void ui_draw_but(const bContext *C, struct ARegion *region, uiStyle *style, uiBu
         fstyle = &style->widgetlabel;
         break;
 
-      case UI_BTYPE_TREEROW:
-        wt = widget_type(UI_WTYPE_TREEROW);
-        fstyle = &style->widgetlabel;
-        break;
-
-      case UI_BTYPE_GRID_TILE:
-        wt = widget_type(UI_WTYPE_GRID_TILE);
+      case UI_BTYPE_VIEW_ITEM:
+        wt = widget_type(UI_WTYPE_VIEW_ITEM);
         fstyle = &style->widgetlabel;
         break;
 
@@ -5121,7 +5079,7 @@ static void ui_draw_popover_back_impl(const uiWidgetColors *wcol,
   if (ELEM(direction, UI_DIR_UP, UI_DIR_DOWN)) {
     const uint pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     const bool is_down = (direction == UI_DIR_DOWN);
     const int sign = is_down ? 1 : -1;
@@ -5197,10 +5155,10 @@ static void draw_disk_shaded(float start,
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   if (shaded) {
     col = GPU_vertformat_attr_add(format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
-    immBindBuiltinProgram(GPU_SHADER_2D_SMOOTH_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
   }
   else {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4ubv(col1);
   }
 
@@ -5311,7 +5269,7 @@ void ui_draw_pie_center(uiBlock *block)
 
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4ubv(btheme->tui.wcol_pie_menu.outline);
 
   imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_internal, subd);
diff --git a/source/blender/editors/interface/resources.c b/source/blender/editors/interface/resources.c
index cfdcd08df4a..93b94d42d39 100644
--- a/source/blender/editors/interface/resources.c
+++ b/source/blender/editors/interface/resources.c
@@ -895,6 +895,12 @@ const uchar *UI_ThemeGetColorPtr(bTheme *btheme, int spacetype, int colorid)
         case TH_WIDGET_TEXT_CURSOR:
           cp = btheme->tui.widget_text_cursor;
           break;
+        case TH_WIDGET_TEXT_SELECTION:
+          cp = btheme->tui.wcol_text.item;
+          break;
+        case TH_WIDGET_TEXT_HIGHLIGHT:
+          cp = btheme->tui.wcol_text.text_sel;
+          break;
 
         case TH_TRANSPARENT_CHECKER_PRIMARY:
           cp = btheme->tui.transparent_checker_primary;
diff --git a/source/blender/editors/interface/view2d.cc b/source/blender/editors/interface/view2d.cc
index ee4bfd351ae..52e278cd4b0 100644
--- a/source/blender/editors/interface/view2d.cc
+++ b/source/blender/editors/interface/view2d.cc
@@ -87,11 +87,11 @@ BLI_INLINE void clamp_rctf_to_rcti(rcti *dst, const rctf *src)
  * \{ */
 
 /**
- * helper to allow scrollbars to dynamically hide
- * - returns a copy of the scrollbar settings with the flags to display
- *   horizontal/vertical scrollbars removed
- * - input scroll value is the v2d->scroll var
- * - hide flags are set per region at drawtime
+ * Helper to allow scroll-bars to dynamically hide:
+ * - Returns a copy of the scroll-bar settings with the flags to display
+ *   horizontal/vertical scroll-bars removed.
+ * - Input scroll value is the v2d->scroll var.
+ * - Hide flags are set per region at draw-time.
  */
 static int view2d_scroll_mapped(int scroll)
 {
@@ -115,7 +115,7 @@ void UI_view2d_mask_from_win(const View2D *v2d, rcti *r_mask)
 /**
  * Called each time #View2D.cur changes, to dynamically update masks.
  *
- * \param mask_scroll: Optionally clamp scrollbars by this region.
+ * \param mask_scroll: Optionally clamp scroll-bars by this region.
  */
 static void view2d_masks(View2D *v2d, const rcti *mask_scroll)
 {
@@ -150,7 +150,7 @@ static void view2d_masks(View2D *v2d, const rcti *mask_scroll)
   }
 
   /* Do not use mapped scroll here because we want to update scroller rects
-   * even if they are not displayed.  For init purposes.  See T75003.*/
+   * even if they are not displayed. For initialization purposes. See T75003. */
   scroll = v2d->scroll;
 
   /* Scrollers are based off region-size:
@@ -177,7 +177,7 @@ static void view2d_masks(View2D *v2d, const rcti *mask_scroll)
 
     /* Currently, all regions that have vertical scale handles,
      * also have the scrubbing area at the top.
-     * So the scrollbar has to move down a bit. */
+     * So the scroll-bar has to move down a bit. */
     if (scroll & V2D_SCROLL_VERTICAL_HANDLES) {
       v2d->vert.ymax -= UI_TIME_SCRUB_MARGIN_Y;
     }
@@ -377,7 +377,7 @@ static void ui_view2d_curRect_validate_resize(View2D *v2d, bool resize)
   rctf *cur, *tot;
 
   /* use mask as size of region that View2D resides in, as it takes into account
-   * scrollbars already - keep in sync with zoomx/zoomy in view_zoomstep_apply_ex! */
+   * scroll-bars already - keep in sync with zoomx/zoomy in #view_zoomstep_apply_ex! */
   winx = (float)(BLI_rcti_size_x(&v2d->mask) + 1);
   winy = (float)(BLI_rcti_size_y(&v2d->mask) + 1);
 
@@ -1136,7 +1136,7 @@ void UI_view2d_multi_grid_draw(
 
   GPU_line_width(1.0f);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
   immBeginAtMost(GPU_PRIM_LINES, vertex_count);
 
   for (int level = 0; level < totlevels; level++) {
@@ -1234,7 +1234,7 @@ void UI_view2d_dot_grid_draw(const View2D *v2d,
   GPUVertFormat *format = immVertexFormat();
   const uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uint color_id = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
 
   /* Scaling the dots fully with the zoom looks too busy, but a bit of size variation is nice. */
   const float min_point_size = 2.0f * UI_DPI_FAC;
@@ -1326,8 +1326,8 @@ struct View2DScrollers {
   /* focus bubbles */
   /* focus bubbles */
   /* focus bubbles */
-  int vert_min, vert_max; /* vertical scrollbar */
-  int hor_min, hor_max;   /* horizontal scrollbar */
+  int vert_min, vert_max; /* vertical scroll-bar */
+  int hor_min, hor_max;   /* horizontal scroll-bar */
 
   /** Exact size of slider backdrop. */
   rcti hor, vert;
@@ -1380,7 +1380,7 @@ void UI_view2d_scrollers_calc(View2D *v2d,
   r_scrollers->hor = hor;
 
   /* scroller 'buttons':
-   * - These should always remain within the visible region of the scrollbar
+   * - These should always remain within the visible region of the scroll-bar
    * - They represent the region of 'tot' that is visible in 'cur'
    */
 
@@ -1473,14 +1473,14 @@ void UI_view2d_scrollers_draw_ex(View2D *v2d, const rcti *mask_custom, bool use_
 
   uchar scrollers_back_color[4];
 
-  /* Color for scrollbar backs */
+  /* Color for scroll-bar backs. */
   UI_GetThemeColor4ubv(TH_BACK, scrollers_back_color);
 
   /* make copies of rects for less typing */
   vert = scrollers.vert;
   hor = scrollers.hor;
 
-  /* horizontal scrollbar */
+  /* Horizontal scroll-bar. */
   if (scroll & V2D_SCROLL_HORIZONTAL) {
     uiWidgetColors wcol = btheme->tui.wcol_scroll;
     /* 0..255 -> min...1 */
@@ -1515,7 +1515,7 @@ void UI_view2d_scrollers_draw_ex(View2D *v2d, const rcti *mask_custom, bool use_
     UI_draw_widget_scroll(&wcol, &hor, &slider, state);
   }
 
-  /* vertical scrollbar */
+  /* Vertical scroll-bar. */
   if (scroll & V2D_SCROLL_VERTICAL) {
     uiWidgetColors wcol = btheme->tui.wcol_scroll;
     rcti slider;
@@ -1695,6 +1695,41 @@ void UI_view2d_view_to_region_fl(
   *r_region_y = v2d->mask.ymin + (y * BLI_rcti_size_y(&v2d->mask));
 }
 
+bool UI_view2d_view_to_region_segment_clip(const View2D *v2d,
+                                           const float xy_a[2],
+                                           const float xy_b[2],
+                                           int r_region_a[2],
+                                           int r_region_b[2])
+{
+  rctf rect_unit;
+  rect_unit.xmin = rect_unit.ymin = 0.0f;
+  rect_unit.xmax = rect_unit.ymax = 1.0f;
+
+  /* Express given coordinates as proportional values. */
+  const float s_a[2] = {
+      (xy_a[0] - v2d->cur.xmin) / BLI_rctf_size_x(&v2d->cur),
+      (xy_a[1] - v2d->cur.ymin) / BLI_rctf_size_y(&v2d->cur),
+  };
+  const float s_b[2] = {
+      (xy_b[0] - v2d->cur.xmin) / BLI_rctf_size_x(&v2d->cur),
+      (xy_b[1] - v2d->cur.ymin) / BLI_rctf_size_y(&v2d->cur),
+  };
+
+  /* Set initial value in case coordinates lie outside bounds. */
+  r_region_a[0] = r_region_b[0] = r_region_a[1] = r_region_b[1] = V2D_IS_CLIPPED;
+
+  if (BLI_rctf_isect_segment(&rect_unit, s_a, s_b)) {
+    r_region_a[0] = (int)(v2d->mask.xmin + (s_a[0] * BLI_rcti_size_x(&v2d->mask)));
+    r_region_a[1] = (int)(v2d->mask.ymin + (s_a[1] * BLI_rcti_size_y(&v2d->mask)));
+    r_region_b[0] = (int)(v2d->mask.xmin + (s_b[0] * BLI_rcti_size_x(&v2d->mask)));
+    r_region_b[1] = (int)(v2d->mask.ymin + (s_b[1] * BLI_rcti_size_y(&v2d->mask)));
+
+    return true;
+  }
+
+  return false;
+}
+
 void UI_view2d_view_to_region_rcti(const View2D *v2d, const rctf *rect_src, rcti *rect_dst)
 {
   const float cur_size[2] = {BLI_rctf_size_x(&v2d->cur), BLI_rctf_size_y(&v2d->cur)};
@@ -2065,12 +2100,22 @@ void UI_view2d_text_cache_draw(ARegion *region)
       col_pack_prev = v2s->col.pack;
     }
 
-    BLF_enable(font_id, BLF_CLIPPING);
-    BLF_clipping(
-        font_id, v2s->rect.xmin - 4, v2s->rect.ymin - 4, v2s->rect.xmax + 4, v2s->rect.ymax + 4);
-    BLF_draw_default(
-        v2s->rect.xmin + xofs, v2s->rect.ymin + yofs, 0.0f, v2s->str, BLF_DRAW_STR_DUMMY_MAX);
-    BLF_disable(font_id, BLF_CLIPPING);
+    /* Don't use clipping if `v2s->rect` is not set. */
+    if (BLI_rcti_size_x(&v2s->rect) == 0 && BLI_rcti_size_y(&v2s->rect) == 0) {
+      BLF_draw_default((float)(v2s->mval[0] + xofs),
+                       (float)(v2s->mval[1] + yofs),
+                       0.0,
+                       v2s->str,
+                       BLF_DRAW_STR_DUMMY_MAX);
+    }
+    else {
+      BLF_enable(font_id, BLF_CLIPPING);
+      BLF_clipping(
+          font_id, v2s->rect.xmin - 4, v2s->rect.ymin - 4, v2s->rect.xmax + 4, v2s->rect.ymax + 4);
+      BLF_draw_default(
+          v2s->rect.xmin + xofs, v2s->rect.ymin + yofs, 0.0f, v2s->str, BLF_DRAW_STR_DUMMY_MAX);
+      BLF_disable(font_id, BLF_CLIPPING);
+    }
   }
   g_v2d_strings = nullptr;
 
diff --git a/source/blender/editors/interface/view2d_draw.cc b/source/blender/editors/interface/view2d_draw.cc
index d76230ba99c..ea4cf399a57 100644
--- a/source/blender/editors/interface/view2d_draw.cc
+++ b/source/blender/editors/interface/view2d_draw.cc
@@ -202,7 +202,7 @@ static void draw_parallel_lines(const ParallelLinesSet *lines,
     immUniform1f("lineWidth", U.pixelsize - 1.0f);
   }
   else {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   }
   immUniformColor3ubv(color);
   immBegin(GPU_PRIM_LINES, steps * 2);
diff --git a/source/blender/editors/interface/view2d_ops.cc b/source/blender/editors/interface/view2d_ops.cc
index ec15c4ffc9f..5f7d82e7b9a 100644
--- a/source/blender/editors/interface/view2d_ops.cc
+++ b/source/blender/editors/interface/view2d_ops.cc
@@ -1821,11 +1821,11 @@ static bool scroller_activate_poll(bContext *C)
   View2D *v2d = &region->v2d;
   wmEvent *event = win->eventstate;
 
-  /* check if mouse in scrollbars, if they're enabled */
+  /* Check if mouse in scroll-bars, if they're enabled. */
   return (UI_view2d_mouse_in_scrollers(region, v2d, event->xy) != 0);
 }
 
-/* initialize customdata for scroller manipulation operator */
+/* Initialize #wmOperator.customdata for scroller manipulation operator. */
 static void scroller_activate_init(bContext *C,
                                    wmOperator *op,
                                    const wmEvent *event,
@@ -2065,7 +2065,7 @@ static int scroller_activate_invoke(bContext *C, wmOperator *op, const wmEvent *
   ARegion *region = CTX_wm_region(C);
   View2D *v2d = &region->v2d;
 
-  /* check if mouse in scrollbars, if they're enabled */
+  /* check if mouse in scroll-bars, if they're enabled */
   const char in_scroller = UI_view2d_mouse_in_scrollers(region, v2d, event->xy);
 
   /* if in a scroller, init customdata then set modal handler which will
diff --git a/source/blender/editors/interface/abstract_view.cc b/source/blender/editors/interface/views/abstract_view.cc
index dea9600fde4..077c76a08f1 100644
--- a/source/blender/editors/interface/abstract_view.cc
+++ b/source/blender/editors/interface/views/abstract_view.cc
@@ -10,6 +10,13 @@
 
 namespace blender::ui {
 
+void AbstractView::register_item(AbstractViewItem &item)
+{
+  /* Actually modifies the item, not the view.  But for the public API it "feels" a bit nicer to
+   * have the view base class register the items, rather than setting the view on the item. */
+  item.view_ = this;
+}
+
 /* ---------------------------------------------------------------------- */
 /** \name View Reconstruction
  * \{ */
diff --git a/source/blender/editors/interface/views/abstract_view_item.cc b/source/blender/editors/interface/views/abstract_view_item.cc
new file mode 100644
index 00000000000..f73183d07e9
--- /dev/null
+++ b/source/blender/editors/interface/views/abstract_view_item.cc
@@ -0,0 +1,373 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup edinterface
+ */
+
+#include "BKE_context.h"
+
+#include "BLI_listbase.h"
+#include "BLI_string.h"
+
+#include "WM_api.h"
+
+#include "UI_interface.h"
+#include "interface_intern.h"
+
+#include "UI_abstract_view.hh"
+
+namespace blender::ui {
+
+/* ---------------------------------------------------------------------- */
+/** \name View Reconstruction
+ * \{ */
+
+void AbstractViewItem::update_from_old(const AbstractViewItem &old)
+{
+  is_active_ = old.is_active_;
+  is_renaming_ = old.is_renaming_;
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Renaming
+ * \{ */
+
+bool AbstractViewItem::supports_renaming() const
+{
+  /* No renaming by default. */
+  return false;
+}
+bool AbstractViewItem::rename(StringRefNull /*new_name*/)
+{
+  /* No renaming by default. */
+  return false;
+}
+
+StringRef AbstractViewItem::get_rename_string() const
+{
+  /* No rename string by default. */
+  return {};
+}
+
+bool AbstractViewItem::is_renaming() const
+{
+  return is_renaming_;
+}
+
+void AbstractViewItem::begin_renaming()
+{
+  AbstractView &view = get_view();
+  if (view.is_renaming() || !supports_renaming()) {
+    return;
+  }
+
+  if (view.begin_renaming()) {
+    is_renaming_ = true;
+  }
+
+  StringRef initial_str = get_rename_string();
+  std::copy(std::begin(initial_str), std::end(initial_str), std::begin(view.get_rename_buffer()));
+}
+
+void AbstractViewItem::rename_apply()
+{
+  const AbstractView &view = get_view();
+  rename(view.get_rename_buffer().data());
+  end_renaming();
+}
+
+void AbstractViewItem::end_renaming()
+{
+  if (!is_renaming()) {
+    return;
+  }
+
+  is_renaming_ = false;
+
+  AbstractView &view = get_view();
+  view.end_renaming();
+}
+
+static AbstractViewItem *find_item_from_rename_button(const uiBut &rename_but)
+{
+  /* A minimal sanity check, can't do much more here. */
+  BLI_assert(rename_but.type == UI_BTYPE_TEXT && rename_but.poin);
+
+  LISTBASE_FOREACH (uiBut *, but, &rename_but.block->buttons) {
+    if (but->type != UI_BTYPE_VIEW_ITEM) {
+      continue;
+    }
+
+    uiButViewItem *view_item_but = (uiButViewItem *)but;
+    AbstractViewItem *item = reinterpret_cast<AbstractViewItem *>(view_item_but->view_item);
+    const AbstractView &view = item->get_view();
+
+    if (item->is_renaming() && (view.get_rename_buffer().data() == rename_but.poin)) {
+      return item;
+    }
+  }
+
+  return nullptr;
+}
+
+static void rename_button_fn(bContext *UNUSED(C), void *arg, char *UNUSED(origstr))
+{
+  const uiBut *rename_but = static_cast<uiBut *>(arg);
+  AbstractViewItem *item = find_item_from_rename_button(*rename_but);
+  BLI_assert(item);
+  item->rename_apply();
+}
+
+void AbstractViewItem::add_rename_button(uiBlock &block)
+{
+  AbstractView &view = get_view();
+  uiBut *rename_but = uiDefBut(&block,
+                               UI_BTYPE_TEXT,
+                               1,
+                               "",
+                               0,
+                               0,
+                               UI_UNIT_X * 10,
+                               UI_UNIT_Y,
+                               view.get_rename_buffer().data(),
+                               1.0f,
+                               view.get_rename_buffer().size(),
+                               0,
+                               0,
+                               "");
+
+  /* Gotta be careful with what's passed to the `arg1` here. Any view data will be freed once the
+   * callback is executed. */
+  UI_but_func_rename_set(rename_but, rename_button_fn, rename_but);
+  UI_but_flag_disable(rename_but, UI_BUT_UNDO);
+
+  const bContext *evil_C = reinterpret_cast<bContext *>(block.evil_C);
+  ARegion *region = CTX_wm_region(evil_C);
+  /* Returns false if the button was removed. */
+  if (UI_but_active_only(evil_C, region, &block, rename_but) == false) {
+    end_renaming();
+  }
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Context Menu
+ * \{ */
+
+void AbstractViewItem::build_context_menu(bContext & /*C*/, uiLayout & /*column*/) const
+{
+  /* No context menu by default. */
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Drag 'n Drop
+ * \{ */
+
+std::unique_ptr<AbstractViewItemDragController> AbstractViewItem::create_drag_controller() const
+{
+  /* There's no drag controller (and hence no drag support) by default. */
+  return nullptr;
+}
+
+std::unique_ptr<AbstractViewItemDropController> AbstractViewItem::create_drop_controller() const
+{
+  /* There's no drop controller (and hence no drop support) by default. */
+  return nullptr;
+}
+
+AbstractViewItemDragController::AbstractViewItemDragController(AbstractView &view) : view_(view)
+{
+}
+
+void AbstractViewItemDragController::on_drag_start()
+{
+  /* Do nothing by default. */
+}
+
+AbstractViewItemDropController::AbstractViewItemDropController(AbstractView &view) : view_(view)
+{
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name General Getters & Setters
+ * \{ */
+
+AbstractView &AbstractViewItem::get_view() const
+{
+  if (UNLIKELY(!view_)) {
+    throw std::runtime_error(
+        "Invalid state, item must be registered through AbstractView::register_item()");
+  }
+  return *view_;
+}
+
+bool AbstractViewItem::is_active() const
+{
+  BLI_assert_msg(get_view().is_reconstructed(),
+                 "State can't be queried until reconstruction is completed");
+  return is_active_;
+}
+
+/** \} */
+
+}  // namespace blender::ui
+
+/* ---------------------------------------------------------------------- */
+/** \name C-API
+ * \{ */
+
+namespace blender::ui {
+
+/**
+ * Helper class to provide a higher level public (C-)API. Has access to private/protected view item
+ * members and ensures some invariants that way.
+ */
+class ViewItemAPIWrapper {
+ public:
+  static bool matches(const AbstractViewItem &a, const AbstractViewItem &b)
+  {
+    if (typeid(a) != typeid(b)) {
+      return false;
+    }
+    /* TODO should match the view as well. */
+    return a.matches(b);
+  }
+
+  static bool can_rename(const AbstractViewItem &item)
+  {
+    const AbstractView &view = item.get_view();
+    return !view.is_renaming() && item.supports_renaming();
+  }
+
+  static bool drag_start(bContext &C, const AbstractViewItem &item)
+  {
+    const std::unique_ptr<AbstractViewItemDragController> drag_controller =
+        item.create_drag_controller();
+    if (!drag_controller) {
+      return false;
+    }
+
+    WM_event_start_drag(&C,
+                        ICON_NONE,
+                        drag_controller->get_drag_type(),
+                        drag_controller->create_drag_data(),
+                        0,
+                        WM_DRAG_FREE_DATA);
+    drag_controller->on_drag_start();
+
+    return true;
+  }
+
+  static bool can_drop(const AbstractViewItem &item,
+                       const wmDrag &drag,
+                       const char **r_disabled_hint)
+  {
+    const std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+    if (!drop_controller) {
+      return false;
+    }
+
+    return drop_controller->can_drop(drag, r_disabled_hint);
+  }
+
+  static std::string drop_tooltip(const AbstractViewItem &item, const wmDrag &drag)
+  {
+    const std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+    if (!drop_controller) {
+      return {};
+    }
+
+    return drop_controller->drop_tooltip(drag);
+  }
+
+  static bool drop_handle(bContext &C, const AbstractViewItem &item, const ListBase &drags)
+  {
+    std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+
+    const char *disabled_hint_dummy = nullptr;
+    LISTBASE_FOREACH (const wmDrag *, drag, &drags) {
+      if (drop_controller->can_drop(*drag, &disabled_hint_dummy)) {
+        return drop_controller->on_drop(&C, *drag);
+      }
+    }
+
+    return false;
+  }
+};
+
+}  // namespace blender::ui
+
+using namespace blender::ui;
+
+bool UI_view_item_is_active(const uiViewItemHandle *item_handle)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  return item.is_active();
+}
+
+bool UI_view_item_matches(const uiViewItemHandle *a_handle, const uiViewItemHandle *b_handle)
+{
+  const AbstractViewItem &a = reinterpret_cast<const AbstractViewItem &>(*a_handle);
+  const AbstractViewItem &b = reinterpret_cast<const AbstractViewItem &>(*b_handle);
+  return ViewItemAPIWrapper::matches(a, b);
+}
+
+bool UI_view_item_can_rename(const uiViewItemHandle *item_handle)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  return ViewItemAPIWrapper::can_rename(item);
+}
+
+void UI_view_item_begin_rename(uiViewItemHandle *item_handle)
+{
+  AbstractViewItem &item = reinterpret_cast<AbstractViewItem &>(*item_handle);
+  item.begin_renaming();
+}
+
+void UI_view_item_context_menu_build(bContext *C,
+                                     const uiViewItemHandle *item_handle,
+                                     uiLayout *column)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  item.build_context_menu(*C, *column);
+}
+
+bool UI_view_item_drag_start(bContext *C, const uiViewItemHandle *item_)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::drag_start(*C, item);
+}
+
+bool UI_view_item_can_drop(const uiViewItemHandle *item_,
+                           const wmDrag *drag,
+                           const char **r_disabled_hint)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::can_drop(item, *drag, r_disabled_hint);
+}
+
+char *UI_view_item_drop_tooltip(const uiViewItemHandle *item_, const wmDrag *drag)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+
+  const std::string tooltip = ViewItemAPIWrapper::drop_tooltip(item, *drag);
+  return tooltip.empty() ? nullptr : BLI_strdup(tooltip.c_str());
+}
+
+bool UI_view_item_drop_handle(bContext *C, const uiViewItemHandle *item_, const ListBase *drags)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::drop_handle(*C, item, *drags);
+}
+
+/** \} */
diff --git a/source/blender/editors/interface/grid_view.cc b/source/blender/editors/interface/views/grid_view.cc
index 19a2326fba1..52ff1460cbd 100644
--- a/source/blender/editors/interface/grid_view.cc
+++ b/source/blender/editors/interface/views/grid_view.cc
@@ -29,9 +29,8 @@ AbstractGridViewItem &AbstractGridView::add_item(std::unique_ptr<AbstractGridVie
   items_.append(std::move(item));
 
   AbstractGridViewItem &added_item = *items_.last();
-  added_item.view_ = this;
-
   item_map_.add(added_item.identifier_, &added_item);
+  register_item(added_item);
 
   return added_item;
 }
@@ -95,18 +94,19 @@ AbstractGridViewItem::AbstractGridViewItem(StringRef identifier) : identifier_(i
 {
 }
 
-bool AbstractGridViewItem::matches(const AbstractGridViewItem &other) const
+bool AbstractGridViewItem::matches(const AbstractViewItem &other) const
 {
-  return identifier_ == other.identifier_;
+  const AbstractGridViewItem &other_grid_item = dynamic_cast<const AbstractGridViewItem &>(other);
+  return identifier_ == other_grid_item.identifier_;
 }
 
 void AbstractGridViewItem::grid_tile_click_fn(struct bContext * /*C*/,
                                               void *but_arg1,
                                               void * /*arg2*/)
 {
-  uiButGridTile *grid_tile_but = (uiButGridTile *)but_arg1;
+  uiButViewItem *view_item_but = (uiButViewItem *)but_arg1;
   AbstractGridViewItem &grid_item = reinterpret_cast<AbstractGridViewItem &>(
-      *grid_tile_but->view_item);
+      *view_item_but->view_item);
 
   grid_item.activate();
 }
@@ -114,8 +114,8 @@ void AbstractGridViewItem::grid_tile_click_fn(struct bContext * /*C*/,
 void AbstractGridViewItem::add_grid_tile_button(uiBlock &block)
 {
   const GridViewStyle &style = get_view().get_style();
-  grid_tile_but_ = (uiButGridTile *)uiDefBut(&block,
-                                             UI_BTYPE_GRID_TILE,
+  view_item_but_ = (uiButViewItem *)uiDefBut(&block,
+                                             UI_BTYPE_VIEW_ITEM,
                                              0,
                                              "",
                                              0,
@@ -129,15 +129,8 @@ void AbstractGridViewItem::add_grid_tile_button(uiBlock &block)
                                              0,
                                              "");
 
-  grid_tile_but_->view_item = reinterpret_cast<uiGridViewItemHandle *>(this);
-  UI_but_func_set(&grid_tile_but_->but, grid_tile_click_fn, grid_tile_but_, nullptr);
-}
-
-bool AbstractGridViewItem::is_active() const
-{
-  BLI_assert_msg(get_view().is_reconstructed(),
-                 "State can't be queried until reconstruction is completed");
-  return is_active_;
+  view_item_but_->view_item = reinterpret_cast<uiViewItemHandle *>(this);
+  UI_but_func_set(&view_item_but_->but, grid_tile_click_fn, view_item_but_, nullptr);
 }
 
 void AbstractGridViewItem::on_activate()
@@ -158,11 +151,6 @@ void AbstractGridViewItem::change_state_delayed()
   }
 }
 
-void AbstractGridViewItem::update_from_old(const AbstractGridViewItem &old)
-{
-  is_active_ = old.is_active_;
-}
-
 void AbstractGridViewItem::activate()
 {
   BLI_assert_msg(get_view().is_reconstructed(),
@@ -191,7 +179,7 @@ const AbstractGridView &AbstractGridViewItem::get_view() const
     throw std::runtime_error(
         "Invalid state, item must be added through AbstractGridView::add_item()");
   }
-  return *view_;
+  return dynamic_cast<AbstractGridView &>(*view_);
 }
 
 /* ---------------------------------------------------------------------- */
@@ -473,24 +461,3 @@ std::optional<bool> PreviewGridItem::should_be_active() const
 }
 
 }  // namespace blender::ui
-
-using namespace blender::ui;
-
-/* ---------------------------------------------------------------------- */
-/* C-API */
-
-using namespace blender::ui;
-
-bool UI_grid_view_item_is_active(const uiGridViewItemHandle *item_handle)
-{
-  const AbstractGridViewItem &item = reinterpret_cast<const AbstractGridViewItem &>(*item_handle);
-  return item.is_active();
-}
-
-bool UI_grid_view_item_matches(const uiGridViewItemHandle *a_handle,
-                               const uiGridViewItemHandle *b_handle)
-{
-  const AbstractGridViewItem &a = reinterpret_cast<const AbstractGridViewItem &>(*a_handle);
-  const AbstractGridViewItem &b = reinterpret_cast<const AbstractGridViewItem &>(*b_handle);
-  return a.matches(b);
-}
diff --git a/source/blender/editors/interface/interface_view.cc b/source/blender/editors/interface/views/interface_view.cc
index 70728565263..c568a8cab74 100644
--- a/source/blender/editors/interface/interface_view.cc
+++ b/source/blender/editors/interface/views/interface_view.cc
@@ -3,10 +3,16 @@
 /** \file
  * \ingroup edinterface
  *
- * This part of the UI-View API is mostly needed to support persistent state of items within the
- * view. Views are stored in #uiBlock's, and kept alive with it until after the next redraw. So we
- * can compare the old view items with the new view items and keep state persistent for matching
- * ones.
+ * Code to manage views as part of the regular screen hierarchy. E.g. managing ownership of views
+ * inside blocks (#uiBlock.views), looking up items in the region, passing WM notifiers to views,
+ * etc.
+ *
+ * Blocks and their contained views are reconstructed on every redraw. This file also contains
+ * functions related to this recreation of views inside blocks. For example to query state
+ * information before the view is done reconstructing (#AbstractView.is_reconstructed() returns
+ * false), it may be enough to query the previous version of the block/view/view-item. Since such
+ * queries rely on the details of the UI reconstruction process, they should remain internal to
+ * `interface/` code.
  */
 
 #include <memory>
@@ -86,24 +92,24 @@ void UI_block_views_listen(const uiBlock *block, const wmRegionListenerParams *l
   }
 }
 
-uiTreeViewItemHandle *UI_block_tree_view_find_item_at(const ARegion *region, const int xy[2])
+uiViewItemHandle *UI_region_views_find_item_at(const ARegion *region, const int xy[2])
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)ui_tree_row_find_mouse_over(region, xy);
-  if (!tree_row_but) {
+  uiButViewItem *item_but = (uiButViewItem *)ui_view_item_find_mouse_over(region, xy);
+  if (!item_but) {
     return nullptr;
   }
 
-  return tree_row_but->tree_item;
+  return item_but->view_item;
 }
 
-uiTreeViewItemHandle *UI_block_tree_view_find_active_item(const ARegion *region)
+uiViewItemHandle *UI_region_views_find_active_item(const ARegion *region)
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)ui_tree_row_find_active(region);
-  if (!tree_row_but) {
+  uiButViewItem *item_but = (uiButViewItem *)ui_view_item_find_active(region);
+  if (!item_but) {
     return nullptr;
   }
 
-  return tree_row_but->tree_item;
+  return item_but->view_item;
 }
 
 static StringRef ui_block_view_find_idname(const uiBlock &block, const AbstractView &view)
@@ -151,39 +157,38 @@ uiViewHandle *ui_block_view_find_matching_in_old_block(const uiBlock *new_block,
   return reinterpret_cast<uiViewHandle *>(old_view);
 }
 
-uiButTreeRow *ui_block_view_find_treerow_in_old_block(const uiBlock *new_block,
-                                                      const uiTreeViewItemHandle *new_item_handle)
+uiButViewItem *ui_block_view_find_matching_view_item_but_in_old_block(
+    const uiBlock *new_block, const uiViewItemHandle *new_item_handle)
 {
   uiBlock *old_block = new_block->oldblock;
   if (!old_block) {
     return nullptr;
   }
 
-  const AbstractTreeViewItem &new_item = *reinterpret_cast<const AbstractTreeViewItem *>(
-      new_item_handle);
+  const AbstractViewItem &new_item = *reinterpret_cast<const AbstractViewItem *>(new_item_handle);
   const AbstractView *old_view = ui_block_view_find_matching_in_old_block_impl(
-      *new_block, new_item.get_tree_view());
+      *new_block, new_item.get_view());
   if (!old_view) {
     return nullptr;
   }
 
   LISTBASE_FOREACH (uiBut *, old_but, &old_block->buttons) {
-    if (old_but->type != UI_BTYPE_TREEROW) {
+    if (old_but->type != UI_BTYPE_VIEW_ITEM) {
       continue;
     }
-    uiButTreeRow *old_treerow_but = (uiButTreeRow *)old_but;
-    if (!old_treerow_but->tree_item) {
+    uiButViewItem *old_item_but = (uiButViewItem *)old_but;
+    if (!old_item_but->view_item) {
       continue;
     }
-    AbstractTreeViewItem &old_item = *reinterpret_cast<AbstractTreeViewItem *>(
-        old_treerow_but->tree_item);
-    /* Check if the row is from the expected tree-view. */
-    if (&old_item.get_tree_view() != old_view) {
+    AbstractViewItem &old_item = *reinterpret_cast<AbstractViewItem *>(old_item_but->view_item);
+    /* Check if the item is from the expected view. */
+    if (&old_item.get_view() != old_view) {
       continue;
     }
 
-    if (UI_tree_view_item_matches(new_item_handle, old_treerow_but->tree_item)) {
-      return old_treerow_but;
+    if (UI_view_item_matches(reinterpret_cast<const uiViewItemHandle *>(&new_item),
+                             reinterpret_cast<const uiViewItemHandle *>(&old_item))) {
+      return old_item_but;
     }
   }
 
diff --git a/source/blender/editors/interface/tree_view.cc b/source/blender/editors/interface/views/tree_view.cc
index d29cf367e59..43fdf741ac5 100644
--- a/source/blender/editors/interface/tree_view.cc
+++ b/source/blender/editors/interface/views/tree_view.cc
@@ -37,9 +37,11 @@ AbstractTreeViewItem &TreeViewItemContainer::add_tree_item(
   if (root_ == nullptr) {
     root_ = this;
   }
-
+  AbstractTreeView &tree_view = static_cast<AbstractTreeView &>(*root_);
   AbstractTreeViewItem &added_item = *children_.last();
   added_item.root_ = root_;
+  tree_view.register_item(added_item);
+
   if (root_ != this) {
     /* Any item that isn't the root can be assumed to the a #AbstractTreeViewItem. Not entirely
      * nice to static_cast this, but well... */
@@ -95,7 +97,7 @@ AbstractTreeViewItem *AbstractTreeView::find_matching_child(
     const AbstractTreeViewItem &lookup_item, const TreeViewOrItem &items)
 {
   for (const auto &iter_item : items.children_) {
-    if (lookup_item.matches(*iter_item)) {
+    if (lookup_item.matches_single(*iter_item)) {
       /* We have a matching item! */
       return iter_item.get();
     }
@@ -118,9 +120,8 @@ void AbstractTreeViewItem::tree_row_click_fn(struct bContext * /*C*/,
                                              void *but_arg1,
                                              void * /*arg2*/)
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)but_arg1;
-  AbstractTreeViewItem &tree_item = reinterpret_cast<AbstractTreeViewItem &>(
-      *tree_row_but->tree_item);
+  uiButViewItem *item_but = (uiButViewItem *)but_arg1;
+  AbstractTreeViewItem &tree_item = reinterpret_cast<AbstractTreeViewItem &>(*item_but->view_item);
 
   tree_item.activate();
   /* Not only activate the item, also show its children. Maybe this should be optional, or
@@ -131,11 +132,11 @@ void AbstractTreeViewItem::tree_row_click_fn(struct bContext * /*C*/,
 void AbstractTreeViewItem::add_treerow_button(uiBlock &block)
 {
   /* For some reason a width > (UI_UNIT_X * 2) make the layout system use all available width. */
-  tree_row_but_ = (uiButTreeRow *)uiDefBut(
-      &block, UI_BTYPE_TREEROW, 0, "", 0, 0, UI_UNIT_X * 10, UI_UNIT_Y, nullptr, 0, 0, 0, 0, "");
+  view_item_but_ = (uiButViewItem *)uiDefBut(
+      &block, UI_BTYPE_VIEW_ITEM, 0, "", 0, 0, UI_UNIT_X * 10, UI_UNIT_Y, nullptr, 0, 0, 0, 0, "");
 
-  tree_row_but_->tree_item = reinterpret_cast<uiTreeViewItemHandle *>(this);
-  UI_but_func_set(&tree_row_but_->but, tree_row_click_fn, tree_row_but_, nullptr);
+  view_item_but_->view_item = reinterpret_cast<uiViewItemHandle *>(this);
+  UI_but_func_set(&view_item_but_->but, tree_row_click_fn, view_item_but_, nullptr);
 }
 
 void AbstractTreeViewItem::add_indent(uiLayout &row) const
@@ -167,10 +168,10 @@ void AbstractTreeViewItem::collapse_chevron_click_fn(struct bContext *C,
 
   const wmWindow *win = CTX_wm_window(C);
   const ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *hovered_item_handle = UI_block_tree_view_find_item_at(region,
-                                                                              win->eventstate->xy);
-  AbstractTreeViewItem *hovered_item = reinterpret_cast<AbstractTreeViewItem *>(
-      hovered_item_handle);
+  uiViewItemHandle *hovered_item_handle = UI_region_views_find_item_at(region,
+                                                                       win->eventstate->xy);
+
+  AbstractTreeViewItem *hovered_item = from_item_handle<AbstractTreeViewItem>(hovered_item_handle);
   BLI_assert(hovered_item != nullptr);
 
   hovered_item->toggle_collapsed();
@@ -204,40 +205,6 @@ void AbstractTreeViewItem::add_collapse_chevron(uiBlock &block) const
   BLI_assert(is_collapse_chevron_but(but));
 }
 
-AbstractTreeViewItem *AbstractTreeViewItem::find_tree_item_from_rename_button(
-    const uiBut &rename_but)
-{
-  /* A minimal sanity check, can't do much more here. */
-  BLI_assert(rename_but.type == UI_BTYPE_TEXT && rename_but.poin);
-
-  LISTBASE_FOREACH (uiBut *, but, &rename_but.block->buttons) {
-    if (but->type != UI_BTYPE_TREEROW) {
-      continue;
-    }
-
-    uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-    AbstractTreeViewItem *item = reinterpret_cast<AbstractTreeViewItem *>(tree_row_but->tree_item);
-    const AbstractTreeView &tree_view = item->get_tree_view();
-
-    if (item->is_renaming() && (tree_view.get_rename_buffer().data() == rename_but.poin)) {
-      return item;
-    }
-  }
-
-  return nullptr;
-}
-
-void AbstractTreeViewItem::rename_button_fn(bContext *UNUSED(C), void *arg, char *UNUSED(origstr))
-{
-  const uiBut *rename_but = static_cast<uiBut *>(arg);
-  AbstractTreeViewItem *item = find_tree_item_from_rename_button(*rename_but);
-  BLI_assert(item);
-
-  const AbstractTreeView &tree_view = item->get_tree_view();
-  item->rename(tree_view.get_rename_buffer().data());
-  item->end_renaming();
-}
-
 void AbstractTreeViewItem::add_rename_button(uiLayout &row)
 {
   uiBlock *block = uiLayoutGetBlock(&row);
@@ -247,33 +214,7 @@ void AbstractTreeViewItem::add_rename_button(uiLayout &row)
   /* Enable emboss for the text button. */
   UI_block_emboss_set(block, UI_EMBOSS);
 
-  AbstractTreeView &tree_view = get_tree_view();
-  uiBut *rename_but = uiDefBut(block,
-                               UI_BTYPE_TEXT,
-                               1,
-                               "",
-                               0,
-                               0,
-                               UI_UNIT_X * 10,
-                               UI_UNIT_Y,
-                               tree_view.get_rename_buffer().data(),
-                               1.0f,
-                               tree_view.get_rename_buffer().size(),
-                               0,
-                               0,
-                               "");
-
-  /* Gotta be careful with what's passed to the `arg1` here. Any tree data will be freed once the
-   * callback is executed. */
-  UI_but_func_rename_set(rename_but, AbstractTreeViewItem::rename_button_fn, rename_but);
-  UI_but_flag_disable(rename_but, UI_BUT_UNDO);
-
-  const bContext *evil_C = static_cast<bContext *>(block->evil_C);
-  ARegion *region = CTX_wm_region(evil_C);
-  /* Returns false if the button was removed. */
-  if (UI_but_active_only(evil_C, region, block, rename_but) == false) {
-    end_renaming();
-  }
+  AbstractViewItem::add_rename_button(*block);
 
   UI_block_emboss_set(block, previous_emboss);
   UI_block_layout_set_current(block, &row);
@@ -306,80 +247,35 @@ bool AbstractTreeViewItem::supports_collapsing() const
   return true;
 }
 
-std::unique_ptr<AbstractTreeViewItemDragController> AbstractTreeViewItem::create_drag_controller()
-    const
-{
-  /* There's no drag controller (and hence no drag support) by default. */
-  return nullptr;
-}
-
-std::unique_ptr<AbstractTreeViewItemDropController> AbstractTreeViewItem::create_drop_controller()
-    const
-{
-  /* There's no drop controller (and hence no drop support) by default. */
-  return nullptr;
-}
-
-bool AbstractTreeViewItem::supports_renaming() const
+StringRef AbstractTreeViewItem::get_rename_string() const
 {
-  /* No renaming by default. */
-  return false;
+  return label_;
 }
 
 bool AbstractTreeViewItem::rename(StringRefNull new_name)
 {
-  /* It is important to update the label after renaming, so #AbstractTreeViewItem::matches()
+  /* It is important to update the label after renaming, so #AbstractTreeViewItem::matches_single()
    * recognizes the item. (It only compares labels by default.) */
   label_ = new_name;
   return true;
 }
 
-void AbstractTreeViewItem::build_context_menu(bContext & /*C*/, uiLayout & /*column*/) const
+void AbstractTreeViewItem::update_from_old(const AbstractViewItem &old)
 {
-  /* No context menu by default. */
-}
+  AbstractViewItem::update_from_old(old);
 
-void AbstractTreeViewItem::update_from_old(const AbstractTreeViewItem &old)
-{
-  is_open_ = old.is_open_;
-  is_active_ = old.is_active_;
-  is_renaming_ = old.is_renaming_;
+  const AbstractTreeViewItem &old_tree_item = dynamic_cast<const AbstractTreeViewItem &>(old);
+  is_open_ = old_tree_item.is_open_;
 }
 
-bool AbstractTreeViewItem::matches(const AbstractTreeViewItem &other) const
+bool AbstractTreeViewItem::matches_single(const AbstractTreeViewItem &other) const
 {
   return label_ == other.label_;
 }
 
-void AbstractTreeViewItem::begin_renaming()
-{
-  AbstractTreeView &tree_view = get_tree_view();
-  if (tree_view.is_renaming() || !supports_renaming()) {
-    return;
-  }
-
-  if (tree_view.begin_renaming()) {
-    is_renaming_ = true;
-  }
-
-  std::copy(std::begin(label_), std::end(label_), std::begin(tree_view.get_rename_buffer()));
-}
-
-void AbstractTreeViewItem::end_renaming()
-{
-  if (!is_renaming()) {
-    return;
-  }
-
-  is_renaming_ = false;
-
-  AbstractTreeView &tree_view = get_tree_view();
-  tree_view.end_renaming();
-}
-
 AbstractTreeView &AbstractTreeViewItem::get_tree_view() const
 {
-  return static_cast<AbstractTreeView &>(*root_);
+  return dynamic_cast<AbstractTreeView &>(get_view());
 }
 
 int AbstractTreeViewItem::count_parents() const
@@ -415,26 +311,19 @@ void AbstractTreeViewItem::deactivate()
   is_active_ = false;
 }
 
-bool AbstractTreeViewItem::is_active() const
-{
-  BLI_assert_msg(get_tree_view().is_reconstructed(),
-                 "State can't be queried until reconstruction is completed");
-  return is_active_;
-}
-
 bool AbstractTreeViewItem::is_hovered() const
 {
   BLI_assert_msg(get_tree_view().is_reconstructed(),
                  "State can't be queried until reconstruction is completed");
-  BLI_assert_msg(tree_row_but_ != nullptr,
+  BLI_assert_msg(view_item_but_ != nullptr,
                  "Hovered state can't be queried before the tree row is being built");
 
-  const uiTreeViewItemHandle *this_handle = reinterpret_cast<const uiTreeViewItemHandle *>(this);
+  const uiViewItemHandle *this_item_handle = reinterpret_cast<const uiViewItemHandle *>(this);
   /* The new layout hasn't finished construction yet, so the final state of the button is unknown.
    * Get the matching button from the previous redraw instead. */
-  uiButTreeRow *old_treerow_but = ui_block_view_find_treerow_in_old_block(tree_row_but_->but.block,
-                                                                          this_handle);
-  return old_treerow_but && (old_treerow_but->but.flag & UI_ACTIVE);
+  uiButViewItem *old_item_but = ui_block_view_find_matching_view_item_but_in_old_block(
+      view_item_but_->but.block, this_item_handle);
+  return old_item_but && (old_item_but->but.flag & UI_ACTIVE);
 }
 
 bool AbstractTreeViewItem::is_collapsed() const
@@ -462,11 +351,6 @@ bool AbstractTreeViewItem::is_collapsible() const
   return this->supports_collapsing();
 }
 
-bool AbstractTreeViewItem::is_renaming() const
-{
-  return is_renaming_;
-}
-
 void AbstractTreeViewItem::ensure_parents_uncollapsed()
 {
   for (AbstractTreeViewItem *parent = parent_; parent; parent = parent->parent_) {
@@ -474,19 +358,21 @@ void AbstractTreeViewItem::ensure_parents_uncollapsed()
   }
 }
 
-bool AbstractTreeViewItem::matches_including_parents(const AbstractTreeViewItem &other) const
+bool AbstractTreeViewItem::matches(const AbstractViewItem &other) const
 {
-  if (!matches(other)) {
+  const AbstractTreeViewItem &other_tree_item = dynamic_cast<const AbstractTreeViewItem &>(other);
+
+  if (!matches_single(other_tree_item)) {
     return false;
   }
-  if (count_parents() != other.count_parents()) {
+  if (count_parents() != other_tree_item.count_parents()) {
     return false;
   }
 
-  for (AbstractTreeViewItem *parent = parent_, *other_parent = other.parent_;
+  for (AbstractTreeViewItem *parent = parent_, *other_parent = other_tree_item.parent_;
        parent && other_parent;
        parent = parent->parent_, other_parent = other_parent->parent_) {
-    if (!parent->matches(*other_parent)) {
+    if (!parent->matches_single(*other_parent)) {
       return false;
     }
   }
@@ -494,9 +380,9 @@ bool AbstractTreeViewItem::matches_including_parents(const AbstractTreeViewItem
   return true;
 }
 
-uiButTreeRow *AbstractTreeViewItem::tree_row_button()
+uiButViewItem *AbstractTreeViewItem::view_item_button()
 {
-  return tree_row_but_;
+  return view_item_but_;
 }
 
 void AbstractTreeViewItem::change_state_delayed()
@@ -509,25 +395,6 @@ void AbstractTreeViewItem::change_state_delayed()
 
 /* ---------------------------------------------------------------------- */
 
-AbstractTreeViewItemDragController::AbstractTreeViewItemDragController(AbstractTreeView &tree_view)
-    : tree_view_(tree_view)
-{
-}
-
-void AbstractTreeViewItemDragController::on_drag_start()
-{
-  /* Do nothing by default. */
-}
-
-/* ---------------------------------------------------------------------- */
-
-AbstractTreeViewItemDropController::AbstractTreeViewItemDropController(AbstractTreeView &tree_view)
-    : tree_view_(tree_view)
-{
-}
-
-/* ---------------------------------------------------------------------- */
-
 class TreeViewLayoutBuilder {
   uiBlock &block_;
 
@@ -573,7 +440,7 @@ void TreeViewLayoutBuilder::polish_layout(const uiBlock &block)
       UI_but_drawflag_enable(static_cast<uiBut *>(but->next), UI_BUT_NO_TEXT_PADDING);
     }
 
-    if (but->type == UI_BTYPE_TREEROW) {
+    if (but->type == UI_BTYPE_VIEW_ITEM) {
       break;
     }
   }
@@ -685,154 +552,4 @@ std::optional<bool> BasicTreeViewItem::should_be_active() const
   return std::nullopt;
 }
 
-/* ---------------------------------------------------------------------- */
-
-/**
- * Helper for a public (C-)API, presenting higher level functionality. Has access to internal
- * data/functionality (friend of #AbstractTreeViewItem), which is sometimes needed when
- * functionality of the API needs to be constructed from multiple internal conditions and/or
- * functions that on their own shouldn't be part of the API.
- */
-class TreeViewItemAPIWrapper {
- public:
-  static bool matches(const AbstractTreeViewItem &a, const AbstractTreeViewItem &b)
-  {
-    /* TODO should match the tree-view as well. */
-    return a.matches_including_parents(b);
-  }
-
-  static bool drag_start(bContext &C, const AbstractTreeViewItem &item)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDragController> drag_controller =
-        item.create_drag_controller();
-    if (!drag_controller) {
-      return false;
-    }
-
-    WM_event_start_drag(&C,
-                        ICON_NONE,
-                        drag_controller->get_drag_type(),
-                        drag_controller->create_drag_data(),
-                        0,
-                        WM_DRAG_FREE_DATA);
-    drag_controller->on_drag_start();
-
-    return true;
-  }
-
-  static bool can_drop(const AbstractTreeViewItem &item,
-                       const wmDrag &drag,
-                       const char **r_disabled_hint)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-    if (!drop_controller) {
-      return false;
-    }
-
-    return drop_controller->can_drop(drag, r_disabled_hint);
-  }
-
-  static std::string drop_tooltip(const AbstractTreeViewItem &item, const wmDrag &drag)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-    if (!drop_controller) {
-      return {};
-    }
-
-    return drop_controller->drop_tooltip(drag);
-  }
-
-  static bool drop_handle(bContext &C, const AbstractTreeViewItem &item, const ListBase &drags)
-  {
-    std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-
-    const char *disabled_hint_dummy = nullptr;
-    LISTBASE_FOREACH (const wmDrag *, drag, &drags) {
-      if (drop_controller->can_drop(*drag, &disabled_hint_dummy)) {
-        return drop_controller->on_drop(&C, *drag);
-      }
-    }
-
-    return false;
-  }
-
-  static bool can_rename(const AbstractTreeViewItem &item)
-  {
-    const AbstractTreeView &tree_view = item.get_tree_view();
-    return !tree_view.is_renaming() && item.supports_renaming();
-  }
-};
-
 }  // namespace blender::ui
-
-/* ---------------------------------------------------------------------- */
-/* C-API */
-
-using namespace blender::ui;
-
-bool UI_tree_view_item_is_active(const uiTreeViewItemHandle *item_handle)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  return item.is_active();
-}
-
-bool UI_tree_view_item_matches(const uiTreeViewItemHandle *a_handle,
-                               const uiTreeViewItemHandle *b_handle)
-{
-  const AbstractTreeViewItem &a = reinterpret_cast<const AbstractTreeViewItem &>(*a_handle);
-  const AbstractTreeViewItem &b = reinterpret_cast<const AbstractTreeViewItem &>(*b_handle);
-  return TreeViewItemAPIWrapper::matches(a, b);
-}
-
-bool UI_tree_view_item_drag_start(bContext *C, uiTreeViewItemHandle *item_)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::drag_start(*C, item);
-}
-
-bool UI_tree_view_item_can_drop(const uiTreeViewItemHandle *item_,
-                                const wmDrag *drag,
-                                const char **r_disabled_hint)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::can_drop(item, *drag, r_disabled_hint);
-}
-
-char *UI_tree_view_item_drop_tooltip(const uiTreeViewItemHandle *item_, const wmDrag *drag)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-
-  const std::string tooltip = TreeViewItemAPIWrapper::drop_tooltip(item, *drag);
-  return tooltip.empty() ? nullptr : BLI_strdup(tooltip.c_str());
-}
-
-bool UI_tree_view_item_drop_handle(bContext *C,
-                                   const uiTreeViewItemHandle *item_,
-                                   const ListBase *drags)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::drop_handle(*C, item, *drags);
-}
-
-bool UI_tree_view_item_can_rename(const uiTreeViewItemHandle *item_handle)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  return TreeViewItemAPIWrapper::can_rename(item);
-}
-
-void UI_tree_view_item_begin_rename(uiTreeViewItemHandle *item_handle)
-{
-  AbstractTreeViewItem &item = reinterpret_cast<AbstractTreeViewItem &>(*item_handle);
-  item.begin_renaming();
-}
-
-void UI_tree_view_item_context_menu_build(bContext *C,
-                                          const uiTreeViewItemHandle *item_handle,
-                                          uiLayout *column)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  item.build_context_menu(*C, *column);
-}
diff --git a/source/blender/editors/io/CMakeLists.txt b/source/blender/editors/io/CMakeLists.txt
index a716c00d5d9..568ece00c4c 100644
--- a/source/blender/editors/io/CMakeLists.txt
+++ b/source/blender/editors/io/CMakeLists.txt
@@ -11,9 +11,9 @@ set(INC
   ../../io/collada
   ../../io/common
   ../../io/gpencil
+  ../../io/stl
   ../../io/usd
   ../../io/wavefront_obj
-  ../../io/stl
   ../../makesdna
   ../../makesrna
   ../../windowmanager
@@ -33,8 +33,8 @@ set(SRC
   io_gpencil_utils.c
   io_obj.c
   io_ops.c
-  io_usd.c
   io_stl_ops.c
+  io_usd.c
 
   io_alembic.h
   io_cache.h
@@ -42,8 +42,8 @@ set(SRC
   io_gpencil.h
   io_obj.h
   io_ops.h
-  io_usd.h
   io_stl_ops.h
+  io_usd.h
 )
 
 set(LIB
diff --git a/source/blender/editors/io/io_alembic.c b/source/blender/editors/io/io_alembic.c
index 0068586730f..d4855f470ff 100644
--- a/source/blender/editors/io/io_alembic.c
+++ b/source/blender/editors/io/io_alembic.c
@@ -39,6 +39,7 @@
 #  include "RNA_define.h"
 #  include "RNA_enum_types.h"
 
+#  include "ED_fileselect.h"
 #  include "ED_object.h"
 
 #  include "UI_interface.h"
@@ -75,20 +76,7 @@ static int wm_alembic_export_invoke(bContext *C, wmOperator *op, const wmEvent *
 
   RNA_boolean_set(op->ptr, "init_scene_frame_range", true);
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    Main *bmain = CTX_data_main(C);
-    char filepath[FILE_MAX];
-
-    if (BKE_main_blendfile_path(bmain)[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, BKE_main_blendfile_path(bmain), sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), ".abc");
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
+  ED_fileselect_ensure_default_filepath(C, op, ".abc");
 
   WM_event_add_fileselect(C, op);
 
@@ -99,7 +87,7 @@ static int wm_alembic_export_invoke(bContext *C, wmOperator *op, const wmEvent *
 
 static int wm_alembic_export_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -619,7 +607,7 @@ static int wm_alembic_import_invoke(bContext *C, wmOperator *op, const wmEvent *
 
 static int wm_alembic_import_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -651,16 +639,16 @@ static int wm_alembic_import_exec(bContext *C, wmOperator *op)
     ED_object_mode_set(C, OB_MODE_OBJECT);
   }
 
-  bool ok = ABC_import(C,
-                       filename,
-                       scale,
-                       is_sequence,
-                       set_frame_range,
-                       sequence_len,
-                       offset,
-                       validate_meshes,
-                       always_add_cache_reader,
-                       as_background_job);
+  struct AlembicImportParams params = {0};
+  params.global_scale = scale;
+  params.sequence_len = sequence_len;
+  params.sequence_offset = offset;
+  params.is_sequence = is_sequence;
+  params.set_frame_range = set_frame_range;
+  params.validate_meshes = validate_meshes;
+  params.always_add_cache_reader = always_add_cache_reader;
+
+  bool ok = ABC_import(C, filename, &params, as_background_job);
 
   return as_background_job || ok ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
 }
diff --git a/source/blender/editors/io/io_collada.c b/source/blender/editors/io/io_collada.c
index c491e7a5815..1048d0eca32 100644
--- a/source/blender/editors/io/io_collada.c
+++ b/source/blender/editors/io/io_collada.c
@@ -19,6 +19,7 @@
 
 #  include "DEG_depsgraph.h"
 
+#  include "ED_fileselect.h"
 #  include "ED_object.h"
 
 #  include "RNA_access.h"
@@ -36,22 +37,7 @@
 
 static int wm_collada_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
-  Main *bmain = CTX_data_main(C);
-
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    char filepath[FILE_MAX];
-    const char *blendfile_path = BKE_main_blendfile_path(bmain);
-
-    if (blendfile_path[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, blendfile_path, sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), ".dae");
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
+  ED_fileselect_ensure_default_filepath(C, op, ".dae");
 
   WM_event_add_fileselect(C, op);
 
@@ -98,7 +84,7 @@ static int wm_collada_export_exec(bContext *C, wmOperator *op)
   int export_count;
   int sample_animations;
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -707,15 +693,17 @@ static int wm_collada_import_exec(bContext *C, wmOperator *op)
   int min_chain_length;
 
   int keep_bind_info;
+  int custom_normals;
   ImportSettings import_settings;
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
 
   /* Options panel */
   import_units = RNA_boolean_get(op->ptr, "import_units");
+  custom_normals = RNA_boolean_get(op->ptr, "custom_normals");
   find_chains = RNA_boolean_get(op->ptr, "find_chains");
   auto_connect = RNA_boolean_get(op->ptr, "auto_connect");
   fix_orientation = RNA_boolean_get(op->ptr, "fix_orientation");
@@ -728,6 +716,7 @@ static int wm_collada_import_exec(bContext *C, wmOperator *op)
 
   import_settings.filepath = filename;
   import_settings.import_units = import_units != 0;
+  import_settings.custom_normals = custom_normals != 0;
   import_settings.auto_connect = auto_connect != 0;
   import_settings.find_chains = find_chains != 0;
   import_settings.fix_orientation = fix_orientation != 0;
@@ -755,6 +744,7 @@ static void uiCollada_importSettings(uiLayout *layout, PointerRNA *imfptr)
   uiItemL(box, IFACE_("Import Data Options"), ICON_MESH_DATA);
 
   uiItemR(box, imfptr, "import_units", 0, NULL, ICON_NONE);
+  uiItemR(box, imfptr, "custom_normals", 0, NULL, ICON_NONE);
 
   box = uiLayoutBox(layout);
   uiItemL(box, IFACE_("Armature Options"), ICON_ARMATURE_DATA);
@@ -806,6 +796,12 @@ void WM_OT_collada_import(wmOperatorType *ot)
                   "otherwise use the settings from the Imported scene");
 
   RNA_def_boolean(ot->srna,
+                  "custom_normals",
+                  1,
+                  "Custom Normals",
+                  "Import custom normals, if available (otherwise Blender will compute them)");
+
+  RNA_def_boolean(ot->srna,
                   "fix_orientation",
                   0,
                   "Fix Leaf Bones",
diff --git a/source/blender/editors/io/io_gpencil_export.c b/source/blender/editors/io/io_gpencil_export.c
index 3f905dd7de0..662a372b608 100644
--- a/source/blender/editors/io/io_gpencil_export.c
+++ b/source/blender/editors/io/io_gpencil_export.c
@@ -20,6 +20,8 @@
 
 #  include "BLT_translation.h"
 
+#  include "ED_fileselect.h"
+
 #  include "RNA_access.h"
 #  include "RNA_define.h"
 
@@ -71,24 +73,6 @@ static void gpencil_export_common_props_definition(wmOperatorType *ot)
                   "Normalize",
                   "Export strokes with constant thickness");
 }
-
-static void set_export_filepath(bContext *C, wmOperator *op, const char *extension)
-{
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    Main *bmain = CTX_data_main(C);
-    char filepath[FILE_MAX];
-
-    if (BKE_main_blendfile_path(bmain)[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, BKE_main_blendfile_path(bmain), sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), extension);
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
-}
 #  endif
 
 /* <-------- SVG single frame export. --------> */
@@ -109,7 +93,7 @@ static bool wm_gpencil_export_svg_common_check(bContext *UNUSED(C), wmOperator *
 
 static int wm_gpencil_export_svg_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
-  set_export_filepath(C, op, ".svg");
+  ED_fileselect_ensure_default_filepath(C, op, ".svg");
 
   WM_event_add_fileselect(C, op);
 
@@ -121,7 +105,7 @@ static int wm_gpencil_export_svg_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   Object *ob = CTX_data_active_object(C);
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -233,7 +217,7 @@ void WM_OT_gpencil_export_svg(wmOperatorType *ot)
                                  FILE_SAVE,
                                  WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
 
   gpencil_export_common_props_definition(ot);
 
@@ -264,7 +248,7 @@ static bool wm_gpencil_export_pdf_common_check(bContext *UNUSED(C), wmOperator *
 
 static int wm_gpencil_export_pdf_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
-  set_export_filepath(C, op, ".pdf");
+  ED_fileselect_ensure_default_filepath(C, op, ".pdf");
 
   WM_event_add_fileselect(C, op);
 
@@ -276,7 +260,7 @@ static int wm_gpencil_export_pdf_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   Object *ob = CTX_data_active_object(C);
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -391,7 +375,7 @@ void WM_OT_gpencil_export_pdf(wmOperatorType *ot)
                                  FILE_SAVE,
                                  WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
 
   static const EnumPropertyItem gpencil_export_frame_items[] = {
       {GP_EXPORT_FRAME_ACTIVE, "ACTIVE", 0, "Active", "Include only active frame"},
diff --git a/source/blender/editors/io/io_gpencil_import.c b/source/blender/editors/io/io_gpencil_import.c
index 9ac64407dcf..eb53f66d8b8 100644
--- a/source/blender/editors/io/io_gpencil_import.c
+++ b/source/blender/editors/io/io_gpencil_import.c
@@ -9,6 +9,8 @@
 
 #  include "BLI_path_util.h"
 
+#  include "MEM_guardedalloc.h"
+
 #  include "DNA_gpencil_types.h"
 #  include "DNA_space_types.h"
 
@@ -63,7 +65,8 @@ static int wm_gpencil_import_svg_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false) ||
+      !(RNA_struct_find_property(op->ptr, "directory"))) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -75,9 +78,6 @@ static int wm_gpencil_import_svg_exec(bContext *C, wmOperator *op)
   }
   View3D *v3d = get_invoke_view3d(C);
 
-  char filename[FILE_MAX];
-  RNA_string_get(op->ptr, "filepath", filename);
-
   /* Set flags. */
   int flag = 0;
 
@@ -101,13 +101,31 @@ static int wm_gpencil_import_svg_exec(bContext *C, wmOperator *op)
       .resolution = resolution,
   };
 
-  /* Do Import. */
-  WM_cursor_wait(1);
-  const bool done = gpencil_io_import(filename, &params);
-  WM_cursor_wait(0);
-
-  if (!done) {
-    BKE_report(op->reports, RPT_WARNING, "Unable to import SVG");
+  /* Loop all selected files to import them. All SVG imported shared the same import
+   * parameters, but they are created in separated grease pencil objects. */
+  PropertyRNA *prop;
+  if ((prop = RNA_struct_find_property(op->ptr, "directory"))) {
+    char *directory = RNA_string_get_alloc(op->ptr, "directory", NULL, 0, NULL);
+
+    if ((prop = RNA_struct_find_property(op->ptr, "files"))) {
+      char file_path[FILE_MAX];
+      RNA_PROP_BEGIN (op->ptr, itemptr, prop) {
+        char *filename = RNA_string_get_alloc(&itemptr, "name", NULL, 0, NULL);
+        BLI_join_dirfile(file_path, sizeof(file_path), directory, filename);
+        MEM_freeN(filename);
+
+        /* Do Import. */
+        WM_cursor_wait(1);
+        RNA_string_get(&itemptr, "name", params.filename);
+        const bool done = gpencil_io_import(file_path, &params);
+        WM_cursor_wait(0);
+        if (!done) {
+          BKE_reportf(op->reports, RPT_WARNING, "Unable to import '%s'", file_path);
+        }
+      }
+      RNA_PROP_END;
+    }
+    MEM_freeN(directory);
   }
 
   return OPERATOR_FINISHED;
@@ -149,10 +167,11 @@ void WM_OT_gpencil_import_svg(wmOperatorType *ot)
   ot->check = wm_gpencil_import_svg_common_check;
 
   WM_operator_properties_filesel(ot,
-                                 FILE_TYPE_OBJECT_IO,
+                                 FILE_TYPE_FOLDER | FILE_TYPE_OBJECT_IO,
                                  FILE_BLENDER,
                                  FILE_OPENFILE,
-                                 WM_FILESEL_FILEPATH | WM_FILESEL_RELPATH | WM_FILESEL_SHOW_PROPS,
+                                 WM_FILESEL_FILEPATH | WM_FILESEL_RELPATH | WM_FILESEL_SHOW_PROPS |
+                                     WM_FILESEL_DIRECTORY | WM_FILESEL_FILES,
                                  FILE_DEFAULTDISPLAY,
                                  FILE_SORT_DEFAULT);
 
diff --git a/source/blender/editors/io/io_obj.c b/source/blender/editors/io/io_obj.c
index 79ec7ebf2a5..cb8eafeb52d 100644
--- a/source/blender/editors/io/io_obj.c
+++ b/source/blender/editors/io/io_obj.c
@@ -18,6 +18,7 @@
 
 #  include "BLT_translation.h"
 
+#  include "ED_fileselect.h"
 #  include "ED_outliner.h"
 
 #  include "MEM_guardedalloc.h"
@@ -58,20 +59,7 @@ static const EnumPropertyItem io_obj_path_mode[] = {
 
 static int wm_obj_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    Main *bmain = CTX_data_main(C);
-    char filepath[FILE_MAX];
-
-    if (BKE_main_blendfile_path(bmain)[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, BKE_main_blendfile_path(bmain), sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), ".obj");
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
+  ED_fileselect_ensure_default_filepath(C, op, ".obj");
 
   WM_event_add_fileselect(C, op);
   return OPERATOR_RUNNING_MODAL;
@@ -79,7 +67,7 @@ static int wm_obj_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUS
 
 static int wm_obj_export_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -105,6 +93,7 @@ static int wm_obj_export_exec(bContext *C, wmOperator *op)
   export_params.path_mode = RNA_enum_get(op->ptr, "path_mode");
   export_params.export_triangulated_mesh = RNA_boolean_get(op->ptr, "export_triangulated_mesh");
   export_params.export_curves_as_nurbs = RNA_boolean_get(op->ptr, "export_curves_as_nurbs");
+  export_params.export_pbr_extensions = RNA_boolean_get(op->ptr, "export_pbr_extensions");
 
   export_params.export_object_groups = RNA_boolean_get(op->ptr, "export_object_groups");
   export_params.export_material_groups = RNA_boolean_get(op->ptr, "export_material_groups");
@@ -126,51 +115,50 @@ static void ui_obj_export_settings(uiLayout *layout, PointerRNA *imfptr)
   uiLayoutSetPropSep(layout, true);
   uiLayoutSetPropDecorate(layout, false);
 
-  /* Animation options. */
-  uiLayout *box = uiLayoutBox(layout);
-  uiItemL(box, IFACE_("Animation"), ICON_ANIM);
-  uiLayout *col = uiLayoutColumn(box, false);
-  uiLayout *sub = uiLayoutColumn(col, false);
-  uiItemR(sub, imfptr, "export_animation", 0, NULL, ICON_NONE);
-  sub = uiLayoutColumn(sub, true);
-  uiItemR(sub, imfptr, "start_frame", 0, IFACE_("Frame Start"), ICON_NONE);
-  uiItemR(sub, imfptr, "end_frame", 0, IFACE_("End"), ICON_NONE);
-  uiLayoutSetEnabled(sub, export_animation);
+  uiLayout *box, *col, *sub, *row;
 
   /* Object Transform options. */
   box = uiLayoutBox(layout);
-  uiItemL(box, IFACE_("Object Properties"), ICON_OBJECT_DATA);
   col = uiLayoutColumn(box, false);
-  sub = uiLayoutColumn(col, false);
-  uiItemR(sub, imfptr, "forward_axis", 0, IFACE_("Axis Forward"), ICON_NONE);
-  uiItemR(sub, imfptr, "up_axis", 0, IFACE_("Up"), ICON_NONE);
-  sub = uiLayoutColumn(col, false);
+  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Limit to"));
+  uiItemR(sub, imfptr, "export_selected_objects", 0, IFACE_("Selected Only"), ICON_NONE);
   uiItemR(sub, imfptr, "scaling_factor", 0, NULL, ICON_NONE);
+
+  row = uiLayoutRow(box, false);
+  uiItemR(row, imfptr, "forward_axis", UI_ITEM_R_EXPAND, IFACE_("Forward Axis"), ICON_NONE);
+  row = uiLayoutRow(box, false);
+  uiItemR(row, imfptr, "up_axis", UI_ITEM_R_EXPAND, IFACE_("Up Axis"), ICON_NONE);
+
+  col = uiLayoutColumn(box, false);
+  sub = uiLayoutColumn(col, false);
   sub = uiLayoutColumnWithHeading(col, false, IFACE_("Objects"));
-  uiItemR(sub, imfptr, "export_selected_objects", 0, IFACE_("Selected Only"), ICON_NONE);
   uiItemR(sub, imfptr, "apply_modifiers", 0, IFACE_("Apply Modifiers"), ICON_NONE);
   uiItemR(sub, imfptr, "export_eval_mode", 0, IFACE_("Properties"), ICON_NONE);
-  sub = uiLayoutColumn(sub, false);
-  uiLayoutSetEnabled(sub, export_materials);
-  uiItemR(sub, imfptr, "path_mode", 0, IFACE_("Path Mode"), ICON_NONE);
 
-  /* Options for what to write. */
+  /* Geometry options. */
   box = uiLayoutBox(layout);
-  uiItemL(box, IFACE_("Geometry Export"), ICON_EXPORT);
   col = uiLayoutColumn(box, false);
-  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Export"));
+  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Geometry"));
   uiItemR(sub, imfptr, "export_uv", 0, IFACE_("UV Coordinates"), ICON_NONE);
   uiItemR(sub, imfptr, "export_normals", 0, IFACE_("Normals"), ICON_NONE);
   uiItemR(sub, imfptr, "export_colors", 0, IFACE_("Colors"), ICON_NONE);
-  uiItemR(sub, imfptr, "export_materials", 0, IFACE_("Materials"), ICON_NONE);
   uiItemR(sub, imfptr, "export_triangulated_mesh", 0, IFACE_("Triangulated Mesh"), ICON_NONE);
   uiItemR(sub, imfptr, "export_curves_as_nurbs", 0, IFACE_("Curves as NURBS"), ICON_NONE);
 
+  /* Material options. */
+  box = uiLayoutBox(layout);
+  col = uiLayoutColumn(box, false);
+  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Materials"));
+  uiItemR(sub, imfptr, "export_materials", 0, IFACE_("Export"), ICON_NONE);
+  sub = uiLayoutColumn(sub, false);
+  uiLayoutSetEnabled(sub, export_materials);
+  uiItemR(sub, imfptr, "export_pbr_extensions", 0, IFACE_("PBR Extensions"), ICON_NONE);
+  uiItemR(sub, imfptr, "path_mode", 0, IFACE_("Path Mode"), ICON_NONE);
+
   /* Grouping options. */
   box = uiLayoutBox(layout);
-  uiItemL(box, IFACE_("Grouping"), ICON_GROUP);
   col = uiLayoutColumn(box, false);
-  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Export"));
+  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Grouping"));
   uiItemR(sub, imfptr, "export_object_groups", 0, IFACE_("Object Groups"), ICON_NONE);
   uiItemR(sub, imfptr, "export_material_groups", 0, IFACE_("Material Groups"), ICON_NONE);
   uiItemR(sub, imfptr, "export_vertex_groups", 0, IFACE_("Vertex Groups"), ICON_NONE);
@@ -178,6 +166,16 @@ static void ui_obj_export_settings(uiLayout *layout, PointerRNA *imfptr)
   sub = uiLayoutColumn(sub, false);
   uiLayoutSetEnabled(sub, export_smooth_groups);
   uiItemR(sub, imfptr, "smooth_group_bitflags", 0, IFACE_("Smooth Group Bitflags"), ICON_NONE);
+
+  /* Animation options. */
+  box = uiLayoutBox(layout);
+  col = uiLayoutColumn(box, false);
+  sub = uiLayoutColumnWithHeading(col, false, IFACE_("Animation"));
+  uiItemR(sub, imfptr, "export_animation", 0, IFACE_("Export"), ICON_NONE);
+  sub = uiLayoutColumn(sub, true);
+  uiLayoutSetEnabled(sub, export_animation);
+  uiItemR(sub, imfptr, "start_frame", 0, IFACE_("Frame Start"), ICON_NONE);
+  uiItemR(sub, imfptr, "end_frame", 0, IFACE_("End"), ICON_NONE);
 }
 
 static void wm_obj_export_draw(bContext *UNUSED(C), wmOperator *op)
@@ -223,15 +221,30 @@ static bool wm_obj_export_check(bContext *C, wmOperator *op)
     RNA_int_set(op->ptr, "start_frame", start);
     RNA_int_set(op->ptr, "end_frame", end);
   }
+  return changed;
+}
+
+/* Both forward and up axes cannot be along the same direction. */
+static void forward_axis_update(struct Main *UNUSED(main),
+                                struct Scene *UNUSED(scene),
+                                struct PointerRNA *ptr)
+{
+  int forward = RNA_enum_get(ptr, "forward_axis");
+  int up = RNA_enum_get(ptr, "up_axis");
+  if ((forward % 3) == (up % 3)) {
+    RNA_enum_set(ptr, "up_axis", (up + 1) % 6);
+  }
+}
 
-  /* Both forward and up axes cannot be the same (or same except opposite sign). */
-  if (RNA_enum_get(op->ptr, "forward_axis") % TOTAL_AXES ==
-      (RNA_enum_get(op->ptr, "up_axis") % TOTAL_AXES)) {
-    /* TODO(@ankitm): Show a warning here. */
-    RNA_enum_set(op->ptr, "up_axis", RNA_enum_get(op->ptr, "up_axis") % TOTAL_AXES + 1);
-    changed = true;
+static void up_axis_update(struct Main *UNUSED(main),
+                           struct Scene *UNUSED(scene),
+                           struct PointerRNA *ptr)
+{
+  int forward = RNA_enum_get(ptr, "forward_axis");
+  int up = RNA_enum_get(ptr, "up_axis");
+  if ((forward % 3) == (up % 3)) {
+    RNA_enum_set(ptr, "forward_axis", (forward + 1) % 6);
   }
-  return changed;
 }
 
 void WM_OT_obj_export(struct wmOperatorType *ot)
@@ -256,7 +269,7 @@ void WM_OT_obj_export(struct wmOperatorType *ot)
                                  FILE_SAVE,
                                  WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
 
   /* Animation options. */
   RNA_def_boolean(ot->srna,
@@ -283,9 +296,11 @@ void WM_OT_obj_export(struct wmOperatorType *ot)
               INT_MIN,
               INT_MAX);
   /* Object transform options. */
-  RNA_def_enum(
+  prop = RNA_def_enum(
       ot->srna, "forward_axis", io_transform_axis, IO_AXIS_NEGATIVE_Z, "Forward Axis", "");
-  RNA_def_enum(ot->srna, "up_axis", io_transform_axis, IO_AXIS_Y, "Up Axis", "");
+  RNA_def_property_update_runtime(prop, (void *)forward_axis_update);
+  prop = RNA_def_enum(ot->srna, "up_axis", io_transform_axis, IO_AXIS_Y, "Up Axis", "");
+  RNA_def_property_update_runtime(prop, (void *)up_axis_update);
   RNA_def_float(ot->srna,
                 "scaling_factor",
                 1.0f,
@@ -324,6 +339,12 @@ void WM_OT_obj_export(struct wmOperatorType *ot)
                   "Export Materials",
                   "Export MTL library. There must be a Principled-BSDF node for image textures to "
                   "be exported to the MTL file");
+  RNA_def_boolean(ot->srna,
+                  "export_pbr_extensions",
+                  false,
+                  "Export Materials with PBR Extensions",
+                  "Export MTL library using PBR extensions (roughness, metallic, sheen, "
+                  "clearcoat, anisotropy, transmission)");
   RNA_def_enum(ot->srna,
                "path_mode",
                io_obj_path_mode,
@@ -382,11 +403,6 @@ static int wm_obj_import_invoke(bContext *C, wmOperator *op, const wmEvent *UNUS
 
 static int wm_obj_import_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    BKE_report(op->reports, RPT_ERROR, "No filename given");
-    return OPERATOR_CANCELLED;
-  }
-
   struct OBJImportParams import_params;
   RNA_string_get(op->ptr, "filepath", import_params.filepath);
   import_params.clamp_size = RNA_float_get(op->ptr, "clamp_size");
@@ -394,8 +410,36 @@ static int wm_obj_import_exec(bContext *C, wmOperator *op)
   import_params.up_axis = RNA_enum_get(op->ptr, "up_axis");
   import_params.import_vertex_groups = RNA_boolean_get(op->ptr, "import_vertex_groups");
   import_params.validate_meshes = RNA_boolean_get(op->ptr, "validate_meshes");
-
-  OBJ_import(C, &import_params);
+  import_params.relative_paths = ((U.flag & USER_RELPATHS) != 0);
+  import_params.clear_selection = true;
+
+  int files_len = RNA_collection_length(op->ptr, "files");
+  if (files_len) {
+    /* Importing multiple files: loop over them and import one by one. */
+    PointerRNA fileptr;
+    PropertyRNA *prop;
+    char dir_only[FILE_MAX], file_only[FILE_MAX];
+
+    RNA_string_get(op->ptr, "directory", dir_only);
+    prop = RNA_struct_find_property(op->ptr, "files");
+    for (int i = 0; i < files_len; i++) {
+      RNA_property_collection_lookup_int(op->ptr, prop, i, &fileptr);
+      RNA_string_get(&fileptr, "name", file_only);
+      BLI_join_dirfile(
+          import_params.filepath, sizeof(import_params.filepath), dir_only, file_only);
+      import_params.clear_selection = (i == 0);
+      OBJ_import(C, &import_params);
+    }
+  }
+  else if (RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
+    /* Importing one file. */
+    RNA_string_get(op->ptr, "filepath", import_params.filepath);
+    OBJ_import(C, &import_params);
+  }
+  else {
+    BKE_report(op->reports, RPT_ERROR, "No filename given");
+    return OPERATOR_CANCELLED;
+  }
 
   Scene *scene = CTX_data_scene(C);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
@@ -417,8 +461,11 @@ static void ui_obj_import_settings(uiLayout *layout, PointerRNA *imfptr)
   uiLayout *sub = uiLayoutColumn(col, false);
   uiItemR(sub, imfptr, "clamp_size", 0, NULL, ICON_NONE);
   sub = uiLayoutColumn(col, false);
-  uiItemR(sub, imfptr, "forward_axis", 0, IFACE_("Axis Forward"), ICON_NONE);
-  uiItemR(sub, imfptr, "up_axis", 0, IFACE_("Up"), ICON_NONE);
+
+  uiLayout *row = uiLayoutRow(box, false);
+  uiItemR(row, imfptr, "forward_axis", UI_ITEM_R_EXPAND, IFACE_("Forward Axis"), ICON_NONE);
+  row = uiLayoutRow(box, false);
+  uiItemR(row, imfptr, "up_axis", UI_ITEM_R_EXPAND, IFACE_("Up Axis"), ICON_NONE);
 
   box = uiLayoutBox(layout);
   uiItemL(box, IFACE_("Options"), ICON_EXPORT);
@@ -453,9 +500,10 @@ void WM_OT_obj_import(struct wmOperatorType *ot)
                                  FILE_TYPE_FOLDER,
                                  FILE_BLENDER,
                                  FILE_OPENFILE,
-                                 WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS,
+                                 WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS |
+                                     WM_FILESEL_DIRECTORY | WM_FILESEL_FILES,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
   RNA_def_float(
       ot->srna,
       "clamp_size",
@@ -466,9 +514,11 @@ void WM_OT_obj_import(struct wmOperatorType *ot)
       "Resize the objects to keep bounding box under this value. Value 0 disables clamping",
       0.0f,
       1000.0f);
-  RNA_def_enum(
+  prop = RNA_def_enum(
       ot->srna, "forward_axis", io_transform_axis, IO_AXIS_NEGATIVE_Z, "Forward Axis", "");
-  RNA_def_enum(ot->srna, "up_axis", io_transform_axis, IO_AXIS_Y, "Up Axis", "");
+  RNA_def_property_update_runtime(prop, (void *)forward_axis_update);
+  prop = RNA_def_enum(ot->srna, "up_axis", io_transform_axis, IO_AXIS_Y, "Up Axis", "");
+  RNA_def_property_update_runtime(prop, (void *)up_axis_update);
   RNA_def_boolean(ot->srna,
                   "import_vertex_groups",
                   false,
diff --git a/source/blender/editors/io/io_stl_ops.c b/source/blender/editors/io/io_stl_ops.c
index 7db32cd6f18..c98e5beaf3b 100644
--- a/source/blender/editors/io/io_stl_ops.c
+++ b/source/blender/editors/io/io_stl_ops.c
@@ -53,7 +53,7 @@ static int wm_stl_import_execute(bContext *C, wmOperator *op)
       STL_import(C, &params);
     }
   }
-  else if (RNA_struct_property_is_set(op->ptr, "filepath")) {
+  else if (RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     RNA_string_get(op->ptr, "filepath", params.filepath);
     STL_import(C, &params);
   }
@@ -104,7 +104,7 @@ void WM_OT_stl_import(struct wmOperatorType *ot)
                                  WM_FILESEL_FILEPATH | WM_FILESEL_FILES | WM_FILESEL_DIRECTORY |
                                      WM_FILESEL_SHOW_PROPS,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
 
   RNA_def_float(ot->srna, "global_scale", 1.0f, 1e-6f, 1e6f, "Scale", "", 0.001f, 1000.0f);
   RNA_def_boolean(ot->srna,
diff --git a/source/blender/editors/io/io_usd.c b/source/blender/editors/io/io_usd.c
index a59cdf60243..eb80cabcd7f 100644
--- a/source/blender/editors/io/io_usd.c
+++ b/source/blender/editors/io/io_usd.c
@@ -21,6 +21,7 @@
 
 #  include "BLT_translation.h"
 
+#  include "ED_fileselect.h"
 #  include "ED_object.h"
 
 #  include "MEM_guardedalloc.h"
@@ -84,21 +85,7 @@ static int wm_usd_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUS
   options->as_background_job = true;
   op->customdata = options;
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    Main *bmain = CTX_data_main(C);
-    char filepath[FILE_MAX];
-    const char *main_blendfile_path = BKE_main_blendfile_path(bmain);
-
-    if (main_blendfile_path[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, main_blendfile_path, sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), ".usdc");
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
+  ED_fileselect_ensure_default_filepath(C, op, ".usdc");
 
   WM_event_add_fileselect(C, op);
 
@@ -107,7 +94,7 @@ static int wm_usd_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUS
 
 static int wm_usd_export_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -204,6 +191,19 @@ static void wm_usd_export_draw(bContext *UNUSED(C), wmOperator *op)
   uiItemR(box, ptr, "use_instancing", 0, NULL, ICON_NONE);
 }
 
+static void free_operator_customdata(wmOperator *op)
+{
+  if (op->customdata) {
+    MEM_freeN(op->customdata);
+    op->customdata = NULL;
+  }
+}
+
+static void wm_usd_export_cancel(bContext *UNUSED(C), wmOperator *op)
+{
+  free_operator_customdata(op);
+}
+
 static bool wm_usd_export_check(bContext *UNUSED(C), wmOperator *op)
 {
   char filepath[FILE_MAX];
@@ -228,6 +228,7 @@ void WM_OT_usd_export(struct wmOperatorType *ot)
   ot->exec = wm_usd_export_exec;
   ot->poll = WM_operator_winactive;
   ot->ui = wm_usd_export_draw;
+  ot->cancel = wm_usd_export_cancel;
   ot->check = wm_usd_export_check;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_PRESET; /* No UNDO possible. */
@@ -331,7 +332,7 @@ static int wm_usd_import_invoke(bContext *C, wmOperator *op, const wmEvent *even
 
 static int wm_usd_import_exec(bContext *C, wmOperator *op)
 {
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
@@ -373,7 +374,7 @@ static int wm_usd_import_exec(bContext *C, wmOperator *op)
 
   const bool create_collection = RNA_boolean_get(op->ptr, "create_collection");
 
-  char *prim_path_mask = malloc(1024);
+  char prim_path_mask[1024];
   RNA_string_get(op->ptr, "prim_path_mask", prim_path_mask);
 
   const bool import_guide = RNA_boolean_get(op->ptr, "import_guide");
@@ -415,7 +416,6 @@ static int wm_usd_import_exec(bContext *C, wmOperator *op)
                                    .import_materials = import_materials,
                                    .import_meshes = import_meshes,
                                    .import_volumes = import_volumes,
-                                   .prim_path_mask = prim_path_mask,
                                    .import_subdiv = import_subdiv,
                                    .import_instance_proxies = import_instance_proxies,
                                    .create_collection = create_collection,
@@ -429,11 +429,18 @@ static int wm_usd_import_exec(bContext *C, wmOperator *op)
                                    .light_intensity_scale = light_intensity_scale,
                                    .mtl_name_collision_mode = mtl_name_collision_mode};
 
+  STRNCPY(params.prim_path_mask, prim_path_mask);
+
   const bool ok = USD_import(C, filename, &params, as_background_job);
 
   return as_background_job || ok ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
 }
 
+static void wm_usd_import_cancel(bContext *UNUSED(C), wmOperator *op)
+{
+  free_operator_customdata(op);
+}
+
 static void wm_usd_import_draw(bContext *UNUSED(C), wmOperator *op)
 {
   uiLayout *layout = op->layout;
@@ -489,6 +496,7 @@ void WM_OT_usd_import(struct wmOperatorType *ot)
 
   ot->invoke = wm_usd_import_invoke;
   ot->exec = wm_usd_import_exec;
+  ot->cancel = wm_usd_import_cancel;
   ot->poll = WM_operator_winactive;
   ot->ui = wm_usd_import_draw;
 
@@ -500,7 +508,7 @@ void WM_OT_usd_import(struct wmOperatorType *ot)
                                  FILE_OPENFILE,
                                  WM_FILESEL_FILEPATH | WM_FILESEL_RELPATH | WM_FILESEL_SHOW_PROPS,
                                  FILE_DEFAULTDISPLAY,
-                                 FILE_SORT_ALPHA);
+                                 FILE_SORT_DEFAULT);
 
   RNA_def_float(
       ot->srna,
diff --git a/source/blender/editors/lattice/editlattice_select.c b/source/blender/editors/lattice/editlattice_select.c
index 54a72c7ea5d..22a9d41fcf7 100644
--- a/source/blender/editors/lattice/editlattice_select.c
+++ b/source/blender/editors/lattice/editlattice_select.c
@@ -78,7 +78,7 @@ bool ED_lattice_deselect_all_multi(struct bContext *C)
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &bases_len);
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = ED_lattice_deselect_all_multi_ex(bases, bases_len);
   MEM_freeN(bases);
   return changed_multi;
@@ -96,10 +96,11 @@ static int lattice_select_random_exec(bContext *C, wmOperator *op)
   const float randfac = RNA_float_get(op->ptr, "ratio");
   const int seed = WM_operator_properties_select_random_seed_increment_get(op);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Lattice *lt = ((Lattice *)obedit->data)->editlatt->latt;
@@ -205,10 +206,11 @@ static int lattice_select_mirror_exec(bContext *C, wmOperator *op)
   const int axis_flag = RNA_enum_get(op->ptr, "axis");
   const bool extend = RNA_boolean_get(op->ptr, "extend");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -271,12 +273,13 @@ static bool lattice_test_bitmap_uvw(
 
 static int lattice_select_more_less(bContext *C, const bool select)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   bool changed = false;
 
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Lattice *lt = ((Lattice *)obedit->data)->editlatt->latt;
@@ -396,12 +399,13 @@ bool ED_lattice_flags_set(Object *obedit, int flag)
 
 static int lattice_select_all_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int action = RNA_enum_get(op->ptr, "action");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
@@ -484,13 +488,14 @@ void LATTICE_OT_select_all(wmOperatorType *ot)
 
 static int lattice_select_ungrouped_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   const bool is_extend = RNA_boolean_get(op->ptr, "extend");
   bool changed = false;
 
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Lattice *lt = ((Lattice *)obedit->data)->editlatt->latt;
@@ -592,7 +597,7 @@ static BPoint *findnearestLattvert(ViewContext *vc, bool select, Base **r_base)
 
   uint bases_len;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc->view_layer, vc->v3d, &bases_len);
+      vc->scene, vc->view_layer, vc->v3d, &bases_len);
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     Base *base = bases[base_index];
     data.is_changed = false;
@@ -633,7 +638,7 @@ bool ED_lattice_select_pick(bContext *C, const int mval[2], const struct SelectP
       /* Deselect everything. */
       uint objects_len = 0;
       Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-          vc.view_layer, vc.v3d, &objects_len);
+          vc.scene, vc.view_layer, vc.v3d, &objects_len);
       for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
         Object *ob = objects[ob_index];
         if (ED_lattice_flags_set(ob, 0)) {
@@ -680,7 +685,8 @@ bool ED_lattice_select_pick(bContext *C, const int mval[2], const struct SelectP
       lt->actbp = LT_ACTBP_NONE;
     }
 
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
diff --git a/source/blender/editors/lattice/editlattice_tools.c b/source/blender/editors/lattice/editlattice_tools.c
index bb68b244d35..cee39ff7d70 100644
--- a/source/blender/editors/lattice/editlattice_tools.c
+++ b/source/blender/editors/lattice/editlattice_tools.c
@@ -49,6 +49,7 @@ static bool make_regular_poll(bContext *C)
 
 static int make_regular_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   const bool is_editmode = CTX_data_edit_object(C) != NULL;
@@ -56,7 +57,7 @@ static int make_regular_exec(bContext *C, wmOperator *UNUSED(op))
   if (is_editmode) {
     uint objects_len;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &objects_len);
+        scene, view_layer, CTX_wm_view3d(C), &objects_len);
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       Object *ob = objects[ob_index];
       Lattice *lt = ob->data;
@@ -195,13 +196,14 @@ static void lattice_swap_point_pairs(
 
 static int lattice_flip_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len;
   bool changed = false;
   const eLattice_FlipAxes axis = RNA_enum_get(op->ptr, "axis");
 
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Lattice *lt;
diff --git a/source/blender/editors/lattice/editlattice_undo.c b/source/blender/editors/lattice/editlattice_undo.c
index 7615a57c8fe..b77786b2421 100644
--- a/source/blender/editors/lattice/editlattice_undo.c
+++ b/source/blender/editors/lattice/editlattice_undo.c
@@ -46,7 +46,7 @@ static CLG_LogRef LOG = {"ed.undo.lattice"};
 /** \name Undo Conversion
  * \{ */
 
-/* TODO(Campbell): this could contain an entire 'Lattice' struct. */
+/* TODO(@campbellbarton): this could contain an entire 'Lattice' struct. */
 typedef struct UndoLattice {
   BPoint *def;
   int pntsu, pntsv, pntsw, actbp;
@@ -131,8 +131,10 @@ static int validate_undoLatt(void *data, void *edata)
 
 static Object *editlatt_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && obedit->type == OB_LATTICE) {
     Lattice *lt = obedit->data;
     if (lt->editlatt != NULL) {
@@ -173,9 +175,10 @@ static bool lattice_undosys_step_encode(struct bContext *C, Main *bmain, UndoSte
 
   /* Important not to use the 3D view when getting objects because all objects
    * outside of this list will be moved out of edit-mode when reading back undo steps. */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
-  Object **objects = ED_undo_editmode_objects_from_view_layer(view_layer, &objects_len);
+  Object **objects = ED_undo_editmode_objects_from_view_layer(scene, view_layer, &objects_len);
 
   us->elems = MEM_callocN(sizeof(*us->elems) * objects_len, __func__);
   us->elems_len = objects_len;
diff --git a/source/blender/editors/mask/CMakeLists.txt b/source/blender/editors/mask/CMakeLists.txt
index fdb0d13f364..593eeb6c69d 100644
--- a/source/blender/editors/mask/CMakeLists.txt
+++ b/source/blender/editors/mask/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 )
 
diff --git a/source/blender/editors/mask/mask_draw.c b/source/blender/editors/mask/mask_draw.c
index 4c01154ba49..3b16497f09f 100644
--- a/source/blender/editors/mask/mask_draw.c
+++ b/source/blender/editors/mask/mask_draw.c
@@ -110,7 +110,7 @@ static void draw_single_handle(const MaskLayer *mask_layer,
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   const uchar rgb_gray[4] = {0x60, 0x60, 0x60, 0xff};
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3ubv(rgb_gray);
 
   /* this could be split into its own loop */
@@ -408,7 +408,7 @@ static void mask_draw_curve_type(const bContext *C,
       /* TODO(merwin): use fancy line shader here
        * probably better with geometry shader (after core profile switch)
        */
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       GPU_line_width(3.0f);
 
@@ -427,7 +427,7 @@ static void mask_draw_curve_type(const bContext *C,
 
     case MASK_DT_BLACK:
     case MASK_DT_WHITE:
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       GPU_line_width(1.0f);
 
       if (draw_type == MASK_DT_BLACK) {
@@ -465,7 +465,7 @@ static void mask_draw_curve_type(const bContext *C,
       mask_color_active_tint(rgb_tmp, rgb_black, is_active);
       rgba_uchar_to_float(colors[1], rgb_tmp);
 
-      immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
       float viewport_size[4];
       GPU_viewport_size_get_f(viewport_size);
@@ -792,7 +792,7 @@ void ED_mask_draw_frames(
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4ub(255, 175, 0, 255);
 
   immBegin(GPU_PRIM_LINES, 2 * num_lines);
diff --git a/source/blender/editors/mask/mask_query.c b/source/blender/editors/mask/mask_query.c
index 02e1524e23e..bb865e925d7 100644
--- a/source/blender/editors/mask/mask_query.c
+++ b/source/blender/editors/mask/mask_query.c
@@ -682,8 +682,7 @@ void ED_mask_get_size(ScrArea *area, int *width, int *height)
       }
       case SPACE_SEQ: {
         //              Scene *scene = CTX_data_scene(C);
-        //              *width = (scene->r.size * scene->r.xsch) / 100;
-        //              *height = (scene->r.size * scene->r.ysch) / 100;
+        //              BKE_render_resolution(&scene->r, false, width, height);
         break;
       }
       case SPACE_IMAGE: {
diff --git a/source/blender/editors/mask/mask_shapekey.c b/source/blender/editors/mask/mask_shapekey.c
index 48944c081a8..77595aa0694 100644
--- a/source/blender/editors/mask/mask_shapekey.c
+++ b/source/blender/editors/mask/mask_shapekey.c
@@ -136,9 +136,9 @@ static int mask_shape_key_feather_reset_exec(bContext *C, wmOperator *UNUSED(op)
       MaskLayerShape *mask_layer_shape_reset;
       MaskLayerShape *mask_layer_shape;
 
-      /* get the shapekey of the current state */
+      /* Get the shape-key of the current state. */
       mask_layer_shape_reset = BKE_mask_layer_shape_alloc(mask_layer, frame);
-      /* initialize from mask - as if inseting a keyframe */
+      /* Initialize from mask - as if inserting a keyframe. */
       BKE_mask_layer_shape_from_mask(mask_layer, mask_layer_shape_reset);
 
       for (mask_layer_shape = mask_layer->splines_shapes.first; mask_layer_shape;
diff --git a/source/blender/editors/mesh/CMakeLists.txt b/source/blender/editors/mesh/CMakeLists.txt
index 28ac913a3e3..218564eaf30 100644
--- a/source/blender/editors/mesh/CMakeLists.txt
+++ b/source/blender/editors/mesh/CMakeLists.txt
@@ -17,7 +17,6 @@ set(INC
   ../../render
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/mesh/editface.cc b/source/blender/editors/mesh/editface.cc
index 69fe69fe117..f729db29b8c 100644
--- a/source/blender/editors/mesh/editface.cc
+++ b/source/blender/editors/mesh/editface.cc
@@ -17,6 +17,7 @@
 #include "DNA_meshdata_types.h"
 #include "DNA_object_types.h"
 
+#include "BKE_attribute.hh"
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_global.h"
@@ -36,14 +37,16 @@
 
 /* own include */
 
-void paintface_flush_flags(bContext *C, Object *ob, short flag)
+void paintface_flush_flags(bContext *C,
+                           Object *ob,
+                           const bool flush_selection,
+                           const bool flush_hidden)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
-  MPoly *polys, *mp_orig;
   const int *index_array = nullptr;
-  int totpoly;
 
-  BLI_assert((flag & ~(SELECT | ME_HIDE)) == 0);
+  BLI_assert(flush_selection || flush_hidden);
 
   if (me == nullptr) {
     return;
@@ -53,7 +56,7 @@ void paintface_flush_flags(bContext *C, Object *ob, short flag)
 
   /* we could call this directly in all areas that change selection,
    * since this could become slow for realtime updates (circle-select for eg) */
-  if (flag & SELECT) {
+  if (flush_selection) {
     BKE_mesh_flush_select_from_polys(me);
   }
 
@@ -64,40 +67,57 @@ void paintface_flush_flags(bContext *C, Object *ob, short flag)
     return;
   }
 
+  bke::AttributeAccessor attributes_me = me->attributes();
   Mesh *me_orig = (Mesh *)ob_eval->runtime.data_orig;
+  bke::MutableAttributeAccessor attributes_orig = me_orig->attributes_for_write();
   Mesh *me_eval = (Mesh *)ob_eval->runtime.data_eval;
+  bke::MutableAttributeAccessor attributes_eval = me_eval->attributes_for_write();
   bool updated = false;
+  const Span<MPoly> me_polys = me->polys();
 
   if (me_orig != nullptr && me_eval != nullptr && me_orig->totpoly == me->totpoly) {
     /* Update the COW copy of the mesh. */
+    MutableSpan<MPoly> orig_polys = me_orig->polys_for_write();
     for (int i = 0; i < me->totpoly; i++) {
-      me_orig->mpoly[i].flag = me->mpoly[i].flag;
+      orig_polys[i].flag = me_polys[i].flag;
     }
-
-    /* If the mesh has only deform modifiers, the evaluated mesh shares arrays. */
-    if (me_eval->mpoly == me_orig->mpoly) {
-      updated = true;
+    if (flush_hidden) {
+      const VArray<bool> hide_poly_me = attributes_me.lookup_or_default<bool>(
+          ".hide_poly", ATTR_DOMAIN_FACE, false);
+      bke::SpanAttributeWriter<bool> hide_poly_orig =
+          attributes_orig.lookup_or_add_for_write_only_span<bool>(".hide_poly", ATTR_DOMAIN_FACE);
+      hide_poly_me.materialize(hide_poly_orig.span);
+      hide_poly_orig.finish();
     }
-    /* Mesh polys => Final derived polys */
-    else if ((index_array = (const int *)CustomData_get_layer(&me_eval->pdata, CD_ORIGINDEX))) {
-      polys = me_eval->mpoly;
-      totpoly = me_eval->totpoly;
 
+    /* Mesh polys => Final derived polys */
+    if ((index_array = (const int *)CustomData_get_layer(&me_eval->pdata, CD_ORIGINDEX))) {
+      MutableSpan<MPoly> eval_polys = me_orig->polys_for_write();
       /* loop over final derived polys */
-      for (int i = 0; i < totpoly; i++) {
+      for (const int i : eval_polys.index_range()) {
         if (index_array[i] != ORIGINDEX_NONE) {
           /* Copy flags onto the final derived poly from the original mesh poly */
-          mp_orig = me->mpoly + index_array[i];
-          polys[i].flag = mp_orig->flag;
+          eval_polys[i].flag = me_polys[index_array[i]].flag;
         }
       }
+      const VArray<bool> hide_poly_orig = attributes_orig.lookup_or_default<bool>(
+          ".hide_poly", ATTR_DOMAIN_FACE, false);
+      bke::SpanAttributeWriter<bool> hide_poly_eval =
+          attributes_eval.lookup_or_add_for_write_only_span<bool>(".hide_poly", ATTR_DOMAIN_FACE);
+      for (const int i : IndexRange(me_eval->totpoly)) {
+        const int orig_poly_index = index_array[i];
+        if (orig_poly_index != ORIGINDEX_NONE) {
+          hide_poly_eval.span[i] = hide_poly_orig[orig_poly_index];
+        }
+      }
+      hide_poly_eval.finish();
 
       updated = true;
     }
   }
 
   if (updated) {
-    if (flag & ME_HIDE) {
+    if (flush_hidden) {
       BKE_mesh_batch_cache_dirty_tag(me_eval, BKE_MESH_BATCH_DIRTY_ALL);
     }
     else {
@@ -115,74 +135,99 @@ void paintface_flush_flags(bContext *C, Object *ob, short flag)
 
 void paintface_hide(bContext *C, Object *ob, const bool unselected)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
   if (me == nullptr || me->totpoly == 0) {
     return;
   }
 
+  MutableSpan<MPoly> polys = me->polys_for_write();
+  bke::MutableAttributeAccessor attributes = me->attributes_for_write();
+  bke::SpanAttributeWriter<bool> hide_poly = attributes.lookup_or_add_for_write_span<bool>(
+      ".hide_poly", ATTR_DOMAIN_FACE);
+
   for (int i = 0; i < me->totpoly; i++) {
-    MPoly *mpoly = &me->mpoly[i];
-    if ((mpoly->flag & ME_HIDE) == 0) {
+    MPoly *mpoly = &polys[i];
+    if (!hide_poly.span[i]) {
       if (((mpoly->flag & ME_FACE_SEL) == 0) == unselected) {
-        mpoly->flag |= ME_HIDE;
+        hide_poly.span[i] = true;
       }
     }
 
-    if (mpoly->flag & ME_HIDE) {
+    if (hide_poly.span[i]) {
       mpoly->flag &= ~ME_FACE_SEL;
     }
   }
 
+  hide_poly.finish();
+
   BKE_mesh_flush_hidden_from_polys(me);
 
-  paintface_flush_flags(C, ob, SELECT | ME_HIDE);
+  paintface_flush_flags(C, ob, true, true);
 }
 
 void paintface_reveal(bContext *C, Object *ob, const bool select)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
   if (me == nullptr || me->totpoly == 0) {
     return;
   }
 
-  for (int i = 0; i < me->totpoly; i++) {
-    MPoly *mpoly = &me->mpoly[i];
-    if (mpoly->flag & ME_HIDE) {
-      SET_FLAG_FROM_TEST(mpoly->flag, select, ME_FACE_SEL);
-      mpoly->flag &= ~ME_HIDE;
+  MutableSpan<MPoly> polys = me->polys_for_write();
+  bke::MutableAttributeAccessor attributes = me->attributes_for_write();
+
+  if (select) {
+    const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+        ".hide_poly", ATTR_DOMAIN_FACE, false);
+    for (int i = 0; i < me->totpoly; i++) {
+      MPoly *mpoly = &polys[i];
+      if (hide_poly[i]) {
+        mpoly->flag |= ME_FACE_SEL;
+      }
     }
   }
 
+  attributes.remove(".hide_poly");
+
   BKE_mesh_flush_hidden_from_polys(me);
 
-  paintface_flush_flags(C, ob, SELECT | ME_HIDE);
+  paintface_flush_flags(C, ob, true, true);
 }
 
 /* Set object-mode face selection seams based on edge data, uses hash table to find seam edges. */
 
 static void select_linked_tfaces_with_seams(Mesh *me, const uint index, const bool select)
 {
+  using namespace blender;
   bool do_it = true;
   bool mark = false;
 
   BLI_bitmap *edge_tag = BLI_BITMAP_NEW(me->totedge, __func__);
   BLI_bitmap *poly_tag = BLI_BITMAP_NEW(me->totpoly, __func__);
 
+  const Span<MEdge> edges = me->edges();
+  MutableSpan<MPoly> polys = me->polys_for_write();
+  const Span<MLoop> loops = me->loops();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+      ".hide_poly", ATTR_DOMAIN_FACE, false);
+
   if (index != (uint)-1) {
     /* only put face under cursor in array */
-    MPoly *mp = &me->mpoly[index];
-    BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, me->mloop + mp->loopstart);
+    const MPoly *mp = &polys[index];
+    BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, &loops[mp->loopstart]);
     BLI_BITMAP_ENABLE(poly_tag, index);
   }
   else {
     /* fill array by selection */
     for (int i = 0; i < me->totpoly; i++) {
-      MPoly *mp = &me->mpoly[i];
-      if (mp->flag & ME_HIDE) {
+      MPoly *mp = &polys[i];
+      if (hide_poly[i]) {
         /* pass */
       }
       else if (mp->flag & ME_FACE_SEL) {
-        BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, me->mloop + mp->loopstart);
+        BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, &loops[mp->loopstart]);
         BLI_BITMAP_ENABLE(poly_tag, i);
       }
     }
@@ -193,17 +238,17 @@ static void select_linked_tfaces_with_seams(Mesh *me, const uint index, const bo
 
     /* expand selection */
     for (int i = 0; i < me->totpoly; i++) {
-      MPoly *mp = &me->mpoly[i];
-      if (mp->flag & ME_HIDE) {
+      MPoly *mp = &polys[i];
+      if (hide_poly[i]) {
         continue;
       }
 
       if (!BLI_BITMAP_TEST(poly_tag, i)) {
         mark = false;
 
-        MLoop *ml = me->mloop + mp->loopstart;
+        const MLoop *ml = &loops[mp->loopstart];
         for (int b = 0; b < mp->totloop; b++, ml++) {
-          if ((me->medge[ml->e].flag & ME_SEAM) == 0) {
+          if ((edges[ml->e].flag & ME_SEAM) == 0) {
             if (BLI_BITMAP_TEST(edge_tag, ml->e)) {
               mark = true;
               break;
@@ -213,7 +258,7 @@ static void select_linked_tfaces_with_seams(Mesh *me, const uint index, const bo
 
         if (mark) {
           BLI_BITMAP_ENABLE(poly_tag, i);
-          BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, me->mloop + mp->loopstart);
+          BKE_mesh_poly_edgebitmap_insert(edge_tag, mp, &loops[mp->loopstart]);
           do_it = true;
         }
       }
@@ -223,7 +268,7 @@ static void select_linked_tfaces_with_seams(Mesh *me, const uint index, const bo
   MEM_freeN(edge_tag);
 
   for (int i = 0; i < me->totpoly; i++) {
-    MPoly *mp = &me->mpoly[i];
+    MPoly *mp = &polys[index];
     if (BLI_BITMAP_TEST(poly_tag, i)) {
       SET_FLAG_FROM_TEST(mp->flag, select, ME_FACE_SEL);
     }
@@ -249,22 +294,28 @@ void paintface_select_linked(bContext *C, Object *ob, const int mval[2], const b
 
   select_linked_tfaces_with_seams(me, index, select);
 
-  paintface_flush_flags(C, ob, SELECT);
+  paintface_flush_flags(C, ob, true, false);
 }
 
 bool paintface_deselect_all_visible(bContext *C, Object *ob, int action, bool flush_flags)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
   if (me == nullptr) {
     return false;
   }
 
+  MutableSpan<MPoly> polys = me->polys_for_write();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+      ".hide_poly", ATTR_DOMAIN_FACE, false);
+
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
 
     for (int i = 0; i < me->totpoly; i++) {
-      MPoly *mpoly = &me->mpoly[i];
-      if ((mpoly->flag & ME_HIDE) == 0 && mpoly->flag & ME_FACE_SEL) {
+      MPoly *mpoly = &polys[i];
+      if (!hide_poly[i] && mpoly->flag & ME_FACE_SEL) {
         action = SEL_DESELECT;
         break;
       }
@@ -274,8 +325,8 @@ bool paintface_deselect_all_visible(bContext *C, Object *ob, int action, bool fl
   bool changed = false;
 
   for (int i = 0; i < me->totpoly; i++) {
-    MPoly *mpoly = &me->mpoly[i];
-    if ((mpoly->flag & ME_HIDE) == 0) {
+    MPoly *mpoly = &polys[i];
+    if (!hide_poly[i]) {
       switch (action) {
         case SEL_SELECT:
           if ((mpoly->flag & ME_FACE_SEL) == 0) {
@@ -299,7 +350,7 @@ bool paintface_deselect_all_visible(bContext *C, Object *ob, int action, bool fl
 
   if (changed) {
     if (flush_flags) {
-      paintface_flush_flags(C, ob, SELECT);
+      paintface_flush_flags(C, ob, true, false);
     }
   }
   return changed;
@@ -307,26 +358,33 @@ bool paintface_deselect_all_visible(bContext *C, Object *ob, int action, bool fl
 
 bool paintface_minmax(Object *ob, float r_min[3], float r_max[3])
 {
+  using namespace blender;
   bool ok = false;
   float vec[3], bmat[3][3];
 
   const Mesh *me = BKE_mesh_from_object(ob);
-  if (!me || !me->mloopuv) {
+  if (!me || !CustomData_has_layer(&me->ldata, CD_MLOOPUV)) {
     return ok;
   }
-  const MVert *mvert = me->mvert;
 
   copy_m3_m4(bmat, ob->obmat);
 
+  const Span<MVert> verts = me->verts();
+  const Span<MPoly> polys = me->polys();
+  const Span<MLoop> loops = me->loops();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+      ".hide_poly", ATTR_DOMAIN_FACE, false);
+
   for (int i = 0; i < me->totpoly; i++) {
-    MPoly *mp = &me->mpoly[i];
-    if (mp->flag & ME_HIDE || !(mp->flag & ME_FACE_SEL)) {
+    const MPoly *mp = &polys[i];
+    if (hide_poly[i] || !(mp->flag & ME_FACE_SEL)) {
       continue;
     }
 
-    const MLoop *ml = me->mloop + mp->loopstart;
+    const MLoop *ml = &loops[mp->loopstart];
     for (int b = 0; b < mp->totloop; b++, ml++) {
-      mul_v3_m3v3(vec, bmat, mvert[ml->v].co);
+      mul_v3_m3v3(vec, bmat, verts[ml->v].co);
       add_v3_v3v3(vec, vec, ob->obmat[3]);
       minmax_v3v3_v3(r_min, r_max, vec);
     }
@@ -342,6 +400,7 @@ bool paintface_mouse_select(bContext *C,
                             const SelectPick_Params *params,
                             Object *ob)
 {
+  using namespace blender;
   MPoly *mpoly_sel = nullptr;
   uint index;
   bool changed = false;
@@ -350,10 +409,15 @@ bool paintface_mouse_select(bContext *C,
   /* Get the face under the cursor */
   Mesh *me = BKE_mesh_from_object(ob);
 
+  MutableSpan<MPoly> polys = me->polys_for_write();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+      ".hide_poly", ATTR_DOMAIN_FACE, false);
+
   if (ED_mesh_pick_face(C, ob, mval, ED_MESH_PICK_DEFAULT_FACE_DIST, &index)) {
     if (index < me->totpoly) {
-      mpoly_sel = me->mpoly + index;
-      if ((mpoly_sel->flag & ME_HIDE) == 0) {
+      mpoly_sel = polys.data() + index;
+      if (!hide_poly[index]) {
         found = true;
       }
     }
@@ -402,7 +466,7 @@ bool paintface_mouse_select(bContext *C,
 
     /* image window redraw */
 
-    paintface_flush_flags(C, ob, SELECT);
+    paintface_flush_flags(C, ob, true, false);
     ED_region_tag_redraw(CTX_wm_region(C)); /* XXX: should redraw all 3D views. */
     changed = true;
   }
@@ -411,12 +475,10 @@ bool paintface_mouse_select(bContext *C,
 
 void paintvert_flush_flags(Object *ob)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
   Mesh *me_eval = BKE_object_get_evaluated_mesh(ob);
-  MVert *mvert_eval, *mv;
   const int *index_array = nullptr;
-  int totvert;
-  int i;
 
   if (me == nullptr) {
     return;
@@ -432,23 +494,21 @@ void paintvert_flush_flags(Object *ob)
 
   index_array = (const int *)CustomData_get_layer(&me_eval->vdata, CD_ORIGINDEX);
 
-  mvert_eval = me_eval->mvert;
-  totvert = me_eval->totvert;
-
-  mv = mvert_eval;
+  const Span<MVert> verts = me->verts_for_write();
+  MutableSpan<MVert> verts_eval = me_eval->verts_for_write();
 
   if (index_array) {
     int orig_index;
-    for (i = 0; i < totvert; i++, mv++) {
+    for (const int i : verts_eval.index_range()) {
       orig_index = index_array[i];
       if (orig_index != ORIGINDEX_NONE) {
-        mv->flag = me->mvert[index_array[i]].flag;
+        verts_eval[i].flag = verts[index_array[i]].flag;
       }
     }
   }
   else {
-    for (i = 0; i < totvert; i++, mv++) {
-      mv->flag = me->mvert[i].flag;
+    for (const int i : verts_eval.index_range()) {
+      verts_eval[i].flag = verts[i].flag;
     }
   }
 
@@ -463,17 +523,23 @@ void paintvert_tag_select_update(bContext *C, Object *ob)
 
 bool paintvert_deselect_all_visible(Object *ob, int action, bool flush_flags)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
   if (me == nullptr) {
     return false;
   }
 
+  MutableSpan<MVert> verts = me->verts_for_write();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_vert = attributes.lookup_or_default<bool>(
+      ".hide_vert", ATTR_DOMAIN_POINT, false);
+
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
 
     for (int i = 0; i < me->totvert; i++) {
-      MVert *mvert = &me->mvert[i];
-      if ((mvert->flag & ME_HIDE) == 0 && mvert->flag & SELECT) {
+      MVert *mvert = &verts[i];
+      if (!hide_vert[i] && mvert->flag & SELECT) {
         action = SEL_DESELECT;
         break;
       }
@@ -482,8 +548,8 @@ bool paintvert_deselect_all_visible(Object *ob, int action, bool flush_flags)
 
   bool changed = false;
   for (int i = 0; i < me->totvert; i++) {
-    MVert *mvert = &me->mvert[i];
-    if ((mvert->flag & ME_HIDE) == 0) {
+    MVert *mvert = &verts[i];
+    if (!hide_vert[i]) {
       switch (action) {
         case SEL_SELECT:
           if ((mvert->flag & SELECT) == 0) {
@@ -526,9 +592,13 @@ bool paintvert_deselect_all_visible(Object *ob, int action, bool flush_flags)
 
 void paintvert_select_ungrouped(Object *ob, bool extend, bool flush_flags)
 {
+  using namespace blender;
   Mesh *me = BKE_mesh_from_object(ob);
-
-  if (me == nullptr || me->dvert == nullptr) {
+  if (me == nullptr) {
+    return;
+  }
+  const Span<MDeformVert> dverts = me->deform_verts();
+  if (dverts.is_empty()) {
     return;
   }
 
@@ -536,10 +606,15 @@ void paintvert_select_ungrouped(Object *ob, bool extend, bool flush_flags)
     paintvert_deselect_all_visible(ob, SEL_DESELECT, false);
   }
 
+  MutableSpan<MVert> verts = me->verts_for_write();
+  bke::AttributeAccessor attributes = me->attributes();
+  const VArray<bool> hide_vert = attributes.lookup_or_default<bool>(
+      ".hide_vert", ATTR_DOMAIN_POINT, false);
+
   for (int i = 0; i < me->totvert; i++) {
-    MVert *mv = &me->mvert[i];
-    MDeformVert *dv = &me->dvert[i];
-    if ((mv->flag & ME_HIDE) == 0) {
+    MVert *mv = &verts[i];
+    const MDeformVert *dv = &dverts[i];
+    if (!hide_vert[i]) {
       if (dv->dw == nullptr) {
         /* if null weight then not grouped */
         mv->flag |= SELECT;
@@ -551,3 +626,65 @@ void paintvert_select_ungrouped(Object *ob, bool extend, bool flush_flags)
     paintvert_flush_flags(ob);
   }
 }
+
+void paintvert_hide(bContext *C, Object *ob, const bool unselected)
+{
+  using namespace blender;
+  Mesh *me = BKE_mesh_from_object(ob);
+  if (me == nullptr || me->totvert == 0) {
+    return;
+  }
+
+  MutableSpan<MVert> verts = me->verts_for_write();
+  bke::MutableAttributeAccessor attributes = me->attributes_for_write();
+  bke::SpanAttributeWriter<bool> hide_vert = attributes.lookup_or_add_for_write_span<bool>(
+      ".hide_vert", ATTR_DOMAIN_POINT);
+
+  for (const int i : verts.index_range()) {
+    MVert &vert = verts[i];
+    if (!hide_vert.span[i]) {
+      if (((vert.flag & SELECT) == 0) == unselected) {
+        hide_vert.span[i] = true;
+      }
+    }
+
+    if (hide_vert.span[i]) {
+      vert.flag &= ~SELECT;
+    }
+  }
+  hide_vert.finish();
+
+  BKE_mesh_flush_hidden_from_verts(me);
+
+  paintvert_flush_flags(ob);
+  paintvert_tag_select_update(C, ob);
+}
+
+void paintvert_reveal(bContext *C, Object *ob, const bool select)
+{
+  using namespace blender;
+  Mesh *me = BKE_mesh_from_object(ob);
+  if (me == nullptr || me->totvert == 0) {
+    return;
+  }
+
+  MutableSpan<MVert> verts = me->verts_for_write();
+  bke::MutableAttributeAccessor attributes = me->attributes_for_write();
+  const VArray<bool> hide_vert = attributes.lookup_or_default<bool>(
+      ".hide_vert", ATTR_DOMAIN_POINT, false);
+
+  for (const int i : verts.index_range()) {
+    MVert &vert = verts[i];
+    if (hide_vert[i]) {
+      SET_FLAG_FROM_TEST(vert.flag, select, SELECT);
+    }
+  }
+
+  /* Remove the hide attribute to reveal all vertices. */
+  attributes.remove(".hide_vert");
+
+  BKE_mesh_flush_hidden_from_verts(me);
+
+  paintvert_flush_flags(ob);
+  paintvert_tag_select_update(C, ob);
+}
diff --git a/source/blender/editors/mesh/editmesh_bevel.c b/source/blender/editors/mesh/editmesh_bevel.c
index e7891450bd6..0a6feeb3665 100644
--- a/source/blender/editors/mesh/editmesh_bevel.c
+++ b/source/blender/editors/mesh/editmesh_bevel.c
@@ -240,7 +240,7 @@ static bool edbm_bevel_init(bContext *C, wmOperator *op, const bool is_modal)
   {
     uint ob_store_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, v3d, &ob_store_len);
+        scene, view_layer, v3d, &ob_store_len);
     opdata->ob_store = MEM_malloc_arrayN(ob_store_len, sizeof(*opdata->ob_store), __func__);
     for (uint ob_index = 0; ob_index < ob_store_len; ob_index++) {
       Object *obedit = objects[ob_index];
@@ -649,7 +649,7 @@ wmKeyMap *bevel_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Bevel Modal Map");
 
-  /* This function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return NULL;
   }
diff --git a/source/blender/editors/mesh/editmesh_bisect.c b/source/blender/editors/mesh/editmesh_bisect.c
index 7b251b77750..5c5a12b3e64 100644
--- a/source/blender/editors/mesh/editmesh_bisect.c
+++ b/source/blender/editors/mesh/editmesh_bisect.c
@@ -99,6 +99,7 @@ static void mesh_bisect_interactive_calc(bContext *C,
 
 static int mesh_bisect_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int valid_objects = 0;
 
@@ -111,7 +112,7 @@ static int mesh_bisect_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -284,7 +285,7 @@ static int mesh_bisect_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
+      CTX_data_scene(C), CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/mesh/editmesh_extrude.c b/source/blender/editors/mesh/editmesh_extrude.c
index 330008d92d1..55e9c32e41b 100644
--- a/source/blender/editors/mesh/editmesh_extrude.c
+++ b/source/blender/editors/mesh/editmesh_extrude.c
@@ -281,10 +281,11 @@ static int edbm_extrude_repeat_exec(bContext *C, wmOperator *op)
 
   mul_v3_fl(offset, scale_offset);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     float offset_local[3], tmat[3][3];
@@ -418,10 +419,11 @@ static bool edbm_extrude_mesh(Object *obedit, BMEditMesh *em, wmOperator *op)
 /* extrude without transform */
 static int edbm_extrude_region_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -477,10 +479,11 @@ void MESH_OT_extrude_region(wmOperatorType *ot)
 /* extrude without transform */
 static int edbm_extrude_context_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -531,10 +534,11 @@ void MESH_OT_extrude_context(wmOperatorType *ot)
 
 static int edbm_extrude_verts_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -584,10 +588,11 @@ void MESH_OT_extrude_verts_indiv(wmOperatorType *ot)
 static int edbm_extrude_edges_exec(bContext *C, wmOperator *op)
 {
   const bool use_normal_flip = RNA_boolean_get(op->ptr, "use_normal_flip");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -637,10 +642,11 @@ void MESH_OT_extrude_edges_indiv(wmOperatorType *ot)
 
 static int edbm_extrude_faces_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -710,7 +716,7 @@ static int edbm_dupli_extrude_cursor_invoke(bContext *C, wmOperator *op, const w
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &objects_len);
+      vc.scene, vc.view_layer, vc.v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     ED_view3d_viewcontext_init_object(&vc, obedit);
@@ -785,8 +791,8 @@ static int edbm_dupli_extrude_cursor_invoke(bContext *C, wmOperator *op, const w
             /* 2D rotate by 90d while adding.
              *  (x, y) = (y, -x)
              *
-             * accumulate the screenspace normal in 2D,
-             * with screenspace edge length weighting the result. */
+             * Accumulate the screen-space normal in 2D,
+             * with screen-space edge length weighting the result. */
             if (line_point_side_v2(co1, co2, mval_f) >= 0.0f) {
               nor[0] += (co1[1] - co2[1]);
               nor[1] += -(co1[0] - co2[0]);
diff --git a/source/blender/editors/mesh/editmesh_extrude_screw.c b/source/blender/editors/mesh/editmesh_extrude_screw.c
index cc493cab0f9..be2d04b14a1 100644
--- a/source/blender/editors/mesh/editmesh_extrude_screw.c
+++ b/source/blender/editors/mesh/editmesh_extrude_screw.c
@@ -41,7 +41,7 @@ static int edbm_screw_exec(bContext *C, wmOperator *op)
   int valence;
   uint objects_empty_len = 0;
   uint failed_axis_len = 0;
-  uint failed_vertices_len = 0;
+  uint failed_verts_len = 0;
 
   turns = RNA_int_get(op->ptr, "turns");
   steps = RNA_int_get(op->ptr, "steps");
@@ -49,9 +49,10 @@ static int edbm_screw_exec(bContext *C, wmOperator *op)
   RNA_float_get_array(op->ptr, "axis", axis);
 
   uint objects_len = 0;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -97,7 +98,7 @@ static int edbm_screw_exec(bContext *C, wmOperator *op)
     }
 
     if (v1 == NULL || v2 == NULL) {
-      failed_vertices_len++;
+      failed_verts_len++;
       continue;
     }
 
@@ -151,7 +152,7 @@ static int edbm_screw_exec(bContext *C, wmOperator *op)
   if (failed_axis_len == objects_len - objects_empty_len) {
     BKE_report(op->reports, RPT_ERROR, "Invalid/unset axis");
   }
-  else if (failed_vertices_len == objects_len - objects_empty_len) {
+  else if (failed_verts_len == objects_len - objects_empty_len) {
     BKE_report(op->reports, RPT_ERROR, "You have to select a string of connected vertices too");
   }
 
diff --git a/source/blender/editors/mesh/editmesh_extrude_spin.c b/source/blender/editors/mesh/editmesh_extrude_spin.c
index ec04ece6569..9e2b7aa7f4d 100644
--- a/source/blender/editors/mesh/editmesh_extrude_spin.c
+++ b/source/blender/editors/mesh/editmesh_extrude_spin.c
@@ -36,6 +36,7 @@
 
 static int edbm_spin_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   float cent[3], axis[3];
   const float d[3] = {0.0f, 0.0f, 0.0f};
@@ -56,7 +57,7 @@ static int edbm_spin_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/mesh/editmesh_inset.c b/source/blender/editors/mesh/editmesh_inset.c
index ae21e6143f6..068e6215c26 100644
--- a/source/blender/editors/mesh/editmesh_inset.c
+++ b/source/blender/editors/mesh/editmesh_inset.c
@@ -132,7 +132,7 @@ static bool edbm_inset_init(bContext *C, wmOperator *op, const bool is_modal)
   {
     uint ob_store_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &ob_store_len);
+        scene, view_layer, CTX_wm_view3d(C), &ob_store_len);
     opdata->ob_store = MEM_malloc_arrayN(ob_store_len, sizeof(*opdata->ob_store), __func__);
     for (uint ob_index = 0; ob_index < ob_store_len; ob_index++) {
       Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/mesh/editmesh_intersect.c b/source/blender/editors/mesh/editmesh_intersect.c
index 166eb40a7db..83cefd1c09d 100644
--- a/source/blender/editors/mesh/editmesh_intersect.c
+++ b/source/blender/editors/mesh/editmesh_intersect.c
@@ -180,11 +180,12 @@ static int edbm_intersect_exec(bContext *C, wmOperator *op)
     default: /* ISECT_SEPARATE_NONE */
       break;
   }
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   uint isect_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -350,11 +351,12 @@ static int edbm_intersect_boolean_exec(bContext *C, wmOperator *op)
   bool has_isect;
 
   test_fn = use_swap ? bm_face_isect_pair_swap : bm_face_isect_pair;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   uint isect_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -815,10 +817,11 @@ static int edbm_face_split_by_edges_exec(bContext *C, wmOperator *UNUSED(op))
 
   BLI_SMALLSTACK_DECLARE(loop_stack, BMLoop *);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
diff --git a/source/blender/editors/mesh/editmesh_knife.c b/source/blender/editors/mesh/editmesh_knife.c
index 5680865ae67..156698be567 100644
--- a/source/blender/editors/mesh/editmesh_knife.c
+++ b/source/blender/editors/mesh/editmesh_knife.c
@@ -489,7 +489,7 @@ static void knifetool_draw_visible_distances(const KnifeTool_OpData *kcd)
   wmOrtho2_region_pixelspace(kcd->region);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   char numstr[256];
   float numstr_size[2];
@@ -629,7 +629,7 @@ static void knifetool_draw_angle(const KnifeTool_OpData *kcd,
 
   uint pos_2d = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Angle as string. */
   char numstr[256];
@@ -4102,7 +4102,7 @@ static void knifetool_init(ViewContext *vc,
   kcd->region = vc->region;
 
   kcd->objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      vc->view_layer, vc->v3d, &kcd->objects_len);
+      vc->scene, vc->view_layer, vc->v3d, &kcd->objects_len);
 
   Object *ob;
   BMEditMesh *em;
@@ -4300,7 +4300,7 @@ static void knifetool_finish_single_pre(KnifeTool_OpData *kcd, Object *ob)
 }
 
 /**
- * A post version is needed to to delay recalculating tessellation after making cuts.
+ * A post version is needed to delay recalculating tessellation after making cuts.
  * Without this, knife-project can't use the BVH tree to select geometry after a cut, see: T98349.
  */
 static void knifetool_finish_single_post(KnifeTool_OpData *UNUSED(kcd), Object *ob)
@@ -4378,7 +4378,7 @@ wmKeyMap *knifetool_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Knife Tool Modal Map");
 
-  /* This function is called for each spacetype, only needs to add map once. */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return NULL;
   }
@@ -4893,12 +4893,13 @@ void MESH_OT_knife_tool(wmOperatorType *ot)
                KNF_MEASUREMENT_NONE,
                "Measurements",
                "Visible distance and angle measurements");
-  RNA_def_enum(ot->srna,
-               "angle_snapping",
-               angle_snapping_items,
-               KNF_CONSTRAIN_ANGLE_MODE_NONE,
-               "Angle Snapping",
-               "Angle snapping mode");
+  prop = RNA_def_enum(ot->srna,
+                      "angle_snapping",
+                      angle_snapping_items,
+                      KNF_CONSTRAIN_ANGLE_MODE_NONE,
+                      "Angle Snapping",
+                      "Angle snapping mode");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_MESH);
 
   prop = RNA_def_float(ot->srna,
                        "angle_snapping_increment",
diff --git a/source/blender/editors/mesh/editmesh_knife_project.c b/source/blender/editors/mesh/editmesh_knife_project.c
index c32b1fa99c0..e27d19ab000 100644
--- a/source/blender/editors/mesh/editmesh_knife_project.c
+++ b/source/blender/editors/mesh/editmesh_knife_project.c
@@ -136,7 +136,7 @@ static int knifeproject_exec(bContext *C, wmOperator *op)
    * since each knife-project runs as a separate operation. */
   uint objects_len;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &objects_len);
+      vc.scene, vc.view_layer, vc.v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     ED_view3d_viewcontext_init_object(&vc, obedit);
diff --git a/source/blender/editors/mesh/editmesh_loopcut.c b/source/blender/editors/mesh/editmesh_loopcut.c
index 5a4b12c2209..591e06be80c 100644
--- a/source/blender/editors/mesh/editmesh_loopcut.c
+++ b/source/blender/editors/mesh/editmesh_loopcut.c
@@ -376,11 +376,12 @@ static int loopcut_init(bContext *C, wmOperator *op, const wmEvent *event)
       .e_index = (uint)RNA_int_get(op->ptr, "edge_index"),
   };
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint bases_len;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
 
   if (is_interactive) {
     for (uint base_index = 0; base_index < bases_len; base_index++) {
@@ -446,7 +447,6 @@ static int loopcut_init(bContext *C, wmOperator *op, const wmEvent *event)
 #ifdef USE_LOOPSLIDE_HACK
   /* for use in macro so we can restore, HACK */
   {
-    Scene *scene = CTX_data_scene(C);
     ToolSettings *settings = scene->toolsettings;
     const bool mesh_select_mode[3] = {
         (settings->selectmode & SCE_SELECT_VERTEX) != 0,
diff --git a/source/blender/editors/mesh/editmesh_mask_extract.c b/source/blender/editors/mesh/editmesh_mask_extract.c
index 7634ce6af9e..a4d41400bae 100644
--- a/source/blender/editors/mesh/editmesh_mask_extract.c
+++ b/source/blender/editors/mesh/editmesh_mask_extract.c
@@ -204,7 +204,7 @@ static int geometry_extract_apply(bContext *C,
     local_view_bits = v3d->local_view_uuid;
   }
   Object *new_ob = ED_object_add_type(C, OB_MESH, NULL, ob->loc, ob->rot, false, local_view_bits);
-  BKE_mesh_nomain_to_mesh(new_mesh, new_ob->data, new_ob, &CD_MASK_EVERYTHING, true);
+  BKE_mesh_nomain_to_mesh(new_mesh, new_ob->data, new_ob);
 
   /* Remove the Face Sets as they need to be recreated when entering Sculpt Mode in the new object.
    * TODO(pablodobarro): In the future we can try to preserve them from the original mesh. */
@@ -486,7 +486,7 @@ static int paint_mask_slice_exec(bContext *C, wmOperator *op)
   Mesh *new_mesh = (Mesh *)BKE_id_copy(bmain, &mesh->id);
 
   if (ob->mode == OB_MODE_SCULPT) {
-    ED_sculpt_undo_geometry_begin(ob, "mask slice");
+    ED_sculpt_undo_geometry_begin(ob, op);
   }
 
   BMesh *bm;
@@ -548,7 +548,7 @@ static int paint_mask_slice_exec(bContext *C, wmOperator *op)
     /* Remove the mask from the new object so it can be sculpted directly after slicing. */
     CustomData_free_layers(&new_ob_mesh->vdata, CD_PAINT_MASK, new_ob_mesh->totvert);
 
-    BKE_mesh_nomain_to_mesh(new_ob_mesh, new_ob->data, new_ob, &CD_MASK_MESH, true);
+    BKE_mesh_nomain_to_mesh(new_ob_mesh, new_ob->data, new_ob);
     BKE_mesh_copy_parameters_for_eval(new_ob->data, mesh);
     WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, new_ob);
     BKE_mesh_batch_cache_dirty_tag(new_ob->data, BKE_MESH_BATCH_DIRTY_ALL);
@@ -557,7 +557,7 @@ static int paint_mask_slice_exec(bContext *C, wmOperator *op)
     WM_event_add_notifier(C, NC_GEOM | ND_DATA, new_ob->data);
   }
 
-  BKE_mesh_nomain_to_mesh(new_mesh, ob->data, ob, &CD_MASK_MESH, true);
+  BKE_mesh_nomain_to_mesh(new_mesh, ob->data, ob);
 
   if (ob->mode == OB_MODE_SCULPT) {
     SculptSession *ss = ob->sculpt;
diff --git a/source/blender/editors/mesh/editmesh_path.c b/source/blender/editors/mesh/editmesh_path.c
index f2e7150e791..ec8c484d890 100644
--- a/source/blender/editors/mesh/editmesh_path.c
+++ b/source/blender/editors/mesh/editmesh_path.c
@@ -21,6 +21,7 @@
 #include "BLI_math.h"
 
 #include "BKE_context.h"
+#include "BKE_customdata.h"
 #include "BKE_editmesh.h"
 #include "BKE_layer.h"
 #include "BKE_report.h"
@@ -348,7 +349,9 @@ static void edgetag_ensure_cd_flag(Mesh *me, const char edge_mode)
       BM_mesh_cd_flag_ensure(bm, me, ME_CDFLAG_EDGE_CREASE);
       break;
     case EDGE_MODE_TAG_BEVEL:
-      BM_mesh_cd_flag_ensure(bm, me, ME_CDFLAG_EDGE_BWEIGHT);
+      if (!CustomData_has_layer(&bm->edata, CD_BWEIGHT)) {
+        BM_data_layer_add(bm, &bm->edata, CD_BWEIGHT);
+      }
       break;
 #ifdef WITH_FREESTYLE
     case EDGE_MODE_TAG_FREESTYLE:
@@ -679,7 +682,8 @@ static int edbm_shortest_path_pick_invoke(bContext *C, wmOperator *op, const wmE
 
   em_setup_viewcontext(C, &vc);
   copy_v2_v2_int(vc.mval, event->mval);
-  Base *basact = BASACT(vc.view_layer);
+  BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+  Base *basact = BKE_view_layer_active_base_get(vc.view_layer);
   BMEditMesh *em = vc.em;
 
   view3d_operator_needs_opengl(C);
@@ -687,7 +691,8 @@ static int edbm_shortest_path_pick_invoke(bContext *C, wmOperator *op, const wmE
   {
     int base_index = -1;
     uint bases_len = 0;
-    Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(vc.view_layer, vc.v3d, &bases_len);
+    Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
+        vc.scene, vc.view_layer, vc.v3d, &bases_len);
     if (EDBM_unified_findnearest(&vc, bases, bases_len, &base_index, &eve, &eed, &efa)) {
       basact = bases[base_index];
       ED_view3d_viewcontext_init_object(&vc, basact->object);
@@ -732,7 +737,8 @@ static int edbm_shortest_path_pick_invoke(bContext *C, wmOperator *op, const wmE
     return OPERATOR_PASS_THROUGH;
   }
 
-  if (vc.view_layer->basact != basact) {
+  BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+  if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
     ED_object_base_activate(C, basact);
   }
 
@@ -814,7 +820,7 @@ static int edbm_shortest_path_select_exec(bContext *C, wmOperator *op)
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
diff --git a/source/blender/editors/mesh/editmesh_polybuild.c b/source/blender/editors/mesh/editmesh_polybuild.c
index 493e476ba4f..17580dbe7d1 100644
--- a/source/blender/editors/mesh/editmesh_polybuild.c
+++ b/source/blender/editors/mesh/editmesh_polybuild.c
@@ -53,11 +53,14 @@ static void edbm_selectmode_ensure(Scene *scene, BMEditMesh *em, short selectmod
 }
 
 /* Could make public, for now just keep here. */
-static void edbm_flag_disable_all_multi(ViewLayer *view_layer, View3D *v3d, const char hflag)
+static void edbm_flag_disable_all_multi(const Scene *scene,
+                                        ViewLayer *view_layer,
+                                        View3D *v3d,
+                                        const char hflag)
 {
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob_iter = objects[ob_index];
     BMEditMesh *em_iter = BKE_editmesh_from_object(ob_iter);
@@ -84,8 +87,10 @@ static bool edbm_preselect_or_active(bContext *C, const View3D *v3d, Base **r_ba
     ED_view3d_gizmo_mesh_preselect_get_active(C, gz, r_base, r_ele);
   }
   else {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Base *base = view_layer->basact;
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Base *base = BKE_view_layer_active_base_get(view_layer);
     Object *obedit = base->object;
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
     BMesh *bm = em->bm;
@@ -128,7 +133,7 @@ static int edbm_polybuild_transform_at_cursor_invoke(bContext *C,
 
   edbm_selectmode_ensure(vc.scene, vc.em, SCE_SELECT_VERTEX);
 
-  edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+  edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
 
   if (ele_act->head.htype == BM_VERT) {
     BM_vert_select_set(bm, (BMVert *)ele_act, true);
@@ -147,7 +152,8 @@ static int edbm_polybuild_transform_at_cursor_invoke(bContext *C,
                   .is_destructive = true,
               });
   if (basact != NULL) {
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
   }
@@ -234,7 +240,8 @@ static int edbm_polybuild_delete_at_cursor_invoke(bContext *C,
                     .is_destructive = true,
                 });
     if (basact != NULL) {
-      if (vc.view_layer->basact != basact) {
+      BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+      if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
         ED_object_base_activate(C, basact);
       }
     }
@@ -292,7 +299,7 @@ static int edbm_polybuild_face_at_cursor_invoke(bContext *C, wmOperator *op, con
     mul_m4_v3(vc.obedit->imat, center);
 
     BMVert *v_new = BM_vert_create(bm, center, NULL, BM_CREATE_NOP);
-    edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+    edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
     BM_vert_select_set(bm, v_new, true);
     BM_select_history_store(bm, v_new);
     changed = true;
@@ -309,7 +316,7 @@ static int edbm_polybuild_face_at_cursor_invoke(bContext *C, wmOperator *op, con
       const float fac = line_point_factor_v3(center, e_act->v1->co, e_act->v2->co);
       BMVert *v_new = BM_edge_split(bm, e_act, e_act->v1, NULL, CLAMPIS(fac, 0.0f, 1.0f));
       copy_v3_v3(v_new->co, center);
-      edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+      edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
       BM_vert_select_set(bm, v_new, true);
       BM_select_history_store(bm, v_new);
     }
@@ -322,7 +329,7 @@ static int edbm_polybuild_face_at_cursor_invoke(bContext *C, wmOperator *op, con
         SWAP(BMVert *, v_tri[0], v_tri[1]);
       }
       BM_face_create_verts(bm, v_tri, 3, f_reference, BM_CREATE_NOP, true);
-      edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+      edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
       BM_vert_select_set(bm, v_tri[2], true);
       BM_select_history_store(bm, v_tri[2]);
     }
@@ -372,7 +379,7 @@ static int edbm_polybuild_face_at_cursor_invoke(bContext *C, wmOperator *op, con
       // BMFace *f_new =
       BM_face_create_verts(bm, v_quad, 4, f_reference, BM_CREATE_NOP, true);
 
-      edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+      edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
       BM_vert_select_set(bm, v_quad[2], true);
       BM_select_history_store(bm, v_quad[2]);
       changed = true;
@@ -402,7 +409,8 @@ static int edbm_polybuild_face_at_cursor_invoke(bContext *C, wmOperator *op, con
                 });
 
     if (basact != NULL) {
-      if (vc.view_layer->basact != basact) {
+      BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+      if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
         ED_object_base_activate(C, basact);
       }
     }
@@ -475,7 +483,7 @@ static int edbm_polybuild_split_at_cursor_invoke(bContext *C,
     BMVert *v_new = BM_edge_split(bm, e_act, e_act->v1, NULL, CLAMPIS(fac, 0.0f, 1.0f));
     copy_v3_v3(v_new->co, center);
 
-    edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+    edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
     BM_vert_select_set(bm, v_new, true);
     BM_select_history_store(bm, v_new);
     changed = true;
@@ -495,7 +503,8 @@ static int edbm_polybuild_split_at_cursor_invoke(bContext *C,
 
     WM_event_add_mousemove(vc.win);
 
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
@@ -578,7 +587,7 @@ static int edbm_polybuild_dissolve_at_cursor_invoke(bContext *C,
   }
 
   if (changed) {
-    edbm_flag_disable_all_multi(vc.view_layer, vc.v3d, BM_ELEM_SELECT);
+    edbm_flag_disable_all_multi(vc.scene, vc.view_layer, vc.v3d, BM_ELEM_SELECT);
 
     EDBM_update(vc.obedit->data,
                 &(const struct EDBMUpdate_Params){
@@ -587,7 +596,8 @@ static int edbm_polybuild_dissolve_at_cursor_invoke(bContext *C,
                     .is_destructive = true,
                 });
 
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
diff --git a/source/blender/editors/mesh/editmesh_rip.c b/source/blender/editors/mesh/editmesh_rip.c
index 6b4edea498e..0c137c94d57 100644
--- a/source/blender/editors/mesh/editmesh_rip.c
+++ b/source/blender/editors/mesh/editmesh_rip.c
@@ -987,10 +987,11 @@ static int edbm_rip_invoke__edge(bContext *C, const wmEvent *event, Object *obed
 /* based on mouse cursor position, it defines how is being ripped */
 static int edbm_rip_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   const bool do_fill = RNA_boolean_get(op->ptr, "use_fill");
 
   bool no_vertex_selected = true;
diff --git a/source/blender/editors/mesh/editmesh_rip_edge.c b/source/blender/editors/mesh/editmesh_rip_edge.c
index 85426acb905..dd4b247a06f 100644
--- a/source/blender/editors/mesh/editmesh_rip_edge.c
+++ b/source/blender/editors/mesh/editmesh_rip_edge.c
@@ -35,10 +35,11 @@ static int edbm_rip_edge_invoke(bContext *C, wmOperator *UNUSED(op), const wmEve
 {
   ARegion *region = CTX_wm_region(C);
   RegionView3D *rv3d = CTX_wm_region_view3d(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/mesh/editmesh_select.c b/source/blender/editors/mesh/editmesh_select.c
index 9c8c5c45cb7..b66fe84e84e 100644
--- a/source/blender/editors/mesh/editmesh_select.c
+++ b/source/blender/editors/mesh/editmesh_select.c
@@ -358,6 +358,7 @@ BMVert *EDBM_vert_find_nearest_ex(ViewContext *vc,
 
 BMVert *EDBM_vert_find_nearest(ViewContext *vc, float *dist_px_manhattan_p)
 {
+  BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
   Base *base = BKE_view_layer_base_find(vc->view_layer, vc->obact);
   return EDBM_vert_find_nearest_ex(vc, dist_px_manhattan_p, false, false, &base, 1, NULL);
 }
@@ -612,6 +613,7 @@ BMEdge *EDBM_edge_find_nearest_ex(ViewContext *vc,
 
 BMEdge *EDBM_edge_find_nearest(ViewContext *vc, float *dist_px_manhattan_p)
 {
+  BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
   Base *base = BKE_view_layer_base_find(vc->view_layer, vc->obact);
   return EDBM_edge_find_nearest_ex(
       vc, dist_px_manhattan_p, NULL, false, false, NULL, &base, 1, NULL);
@@ -831,6 +833,7 @@ BMFace *EDBM_face_find_nearest_ex(ViewContext *vc,
 
 BMFace *EDBM_face_find_nearest(ViewContext *vc, float *dist_px_manhattan_p)
 {
+  BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
   Base *base = BKE_view_layer_base_find(vc->view_layer, vc->obact);
   return EDBM_face_find_nearest_ex(
       vc, dist_px_manhattan_p, NULL, false, false, false, NULL, &base, 1, NULL);
@@ -1512,10 +1515,11 @@ static void walker_select(BMEditMesh *em, int walkercode, void *start, const boo
 static int edbm_loop_multiselect_exec(bContext *C, wmOperator *op)
 {
   const bool is_ring = RNA_boolean_get(op->ptr, "ring");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -1681,7 +1685,8 @@ static bool mouse_mesh_loop(
   em_original->selectmode = SCE_SELECT_EDGE;
 
   uint bases_len;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(vc.view_layer, vc.v3d, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
 
   {
     int base_index = -1;
@@ -1903,12 +1908,13 @@ void MESH_OT_edgering_select(wmOperatorType *ot)
 
 static int edbm_select_all_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int action = RNA_enum_get(op->ptr, "action");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
@@ -1971,10 +1977,11 @@ void MESH_OT_select_all(wmOperatorType *ot)
 
 static int edbm_faces_select_interior_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -2031,7 +2038,8 @@ bool EDBM_select_pick(bContext *C, const int mval[2], const struct SelectPick_Pa
   vc.mval[1] = mval[1];
 
   uint bases_len = 0;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(vc.view_layer, vc.v3d, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
 
   bool changed = false;
   bool found = unified_findnearest(&vc, bases, bases_len, &base_index_active, &eve, &eed, &efa);
@@ -2214,7 +2222,8 @@ bool EDBM_select_pick(bContext *C, const int mval[2], const struct SelectPick_Pa
 
     /* Changing active object is handy since it allows us to
      * switch UV layers, vgroups for eg. */
-    if (vc.view_layer->basact != basact) {
+    BKE_view_layer_synced_ensure(vc.scene, vc.view_layer);
+    if (BKE_view_layer_active_base_get(vc.view_layer) != basact) {
       ED_object_base_activate(C, basact);
     }
 
@@ -2488,7 +2497,7 @@ bool EDBM_selectmode_toggle_multi(bContext *C,
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob_iter = objects[ob_index];
@@ -2584,7 +2593,7 @@ bool EDBM_selectmode_set_multi(bContext *C, const short selectmode)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob_iter = objects[ob_index];
@@ -2723,7 +2732,7 @@ bool EDBM_mesh_deselect_all_multi(struct bContext *C)
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &bases_len);
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = EDBM_mesh_deselect_all_multi_ex(bases, bases_len);
   MEM_freeN(bases);
   return changed_multi;
@@ -2758,7 +2767,7 @@ bool EDBM_selectmode_disable_multi(struct bContext *C,
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, NULL, &bases_len);
+      vc.scene, vc.view_layer, NULL, &bases_len);
   bool changed_multi = EDBM_selectmode_disable_multi_ex(
       scene, bases, bases_len, selectmode_disable, selectmode_fallback);
   MEM_freeN(bases);
@@ -3245,7 +3254,7 @@ static int edbm_select_linked_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3612,7 +3621,8 @@ static int edbm_select_linked_pick_invoke(bContext *C, wmOperator *op, const wmE
   em_setup_viewcontext(C, &vc);
 
   uint bases_len;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(vc.view_layer, vc.v3d, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
 
   {
     bool has_edges = false;
@@ -3663,7 +3673,7 @@ static int edbm_select_linked_pick_invoke(bContext *C, wmOperator *op, const wmE
      * which might not be available on redo. */
     BM_mesh_elem_index_ensure(bm, ele->head.htype);
     int object_index;
-    index = EDBM_elem_to_index_any_multi(vc.view_layer, em, ele, &object_index);
+    index = EDBM_elem_to_index_any_multi(vc.scene, vc.view_layer, em, ele, &object_index);
     BLI_assert(object_index >= 0);
     RNA_int_set(op->ptr, "object_index", object_index);
     RNA_int_set(op->ptr, "index", index);
@@ -3682,11 +3692,12 @@ static int edbm_select_linked_pick_exec(bContext *C, wmOperator *op)
   BMElem *ele;
 
   {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     /* Intentionally wrap negative values so the lookup fails. */
     const uint object_index = (uint)RNA_int_get(op->ptr, "object_index");
     const uint index = (uint)RNA_int_get(op->ptr, "index");
-    ele = EDBM_elem_from_index_any_multi(view_layer, object_index, index, &obedit);
+    ele = EDBM_elem_from_index_any_multi(scene, view_layer, object_index, index, &obedit);
   }
 
   if (ele == NULL) {
@@ -3753,13 +3764,14 @@ void MESH_OT_select_linked_pick(wmOperatorType *ot)
 
 static int edbm_select_face_by_sides_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   const bool extend = RNA_boolean_get(op->ptr, "extend");
   const int numverts = RNA_int_get(op->ptr, "number");
   const int type = RNA_enum_get(op->ptr, "type");
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3844,12 +3856,13 @@ void MESH_OT_select_face_by_sides(wmOperatorType *ot)
 
 static int edbm_select_loose_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool extend = RNA_boolean_get(op->ptr, "extend");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3934,6 +3947,7 @@ void MESH_OT_select_loose(wmOperatorType *ot)
 
 static int edbm_select_mirror_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const int axis_flag = RNA_enum_get(op->ptr, "axis");
   const bool extend = RNA_boolean_get(op->ptr, "extend");
@@ -3944,7 +3958,7 @@ static int edbm_select_mirror_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4008,12 +4022,13 @@ void MESH_OT_select_mirror(wmOperatorType *ot)
 
 static int edbm_select_more_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool use_face_step = RNA_boolean_get(op->ptr, "use_face_step");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -4058,12 +4073,13 @@ void MESH_OT_select_more(wmOperatorType *ot)
 
 static int edbm_select_less_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool use_face_step = RNA_boolean_get(op->ptr, "use_face_step");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -4296,6 +4312,7 @@ static bool edbm_deselect_nth(BMEditMesh *em, const struct CheckerIntervalParams
 
 static int edbm_select_nth_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   struct CheckerIntervalParams op_params;
   WM_operator_properties_checker_interval_from_op(op, &op_params);
@@ -4303,7 +4320,7 @@ static int edbm_select_nth_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4374,10 +4391,11 @@ static int edbm_select_sharp_edges_exec(bContext *C, wmOperator *op)
    */
   const float angle_limit_cos = cosf(RNA_float_get(op->ptr, "sharpness"));
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4450,10 +4468,11 @@ void MESH_OT_edges_select_sharp(wmOperatorType *ot)
 
 static int edbm_select_linked_flat_faces_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   const float angle_limit_cos = cosf(RNA_float_get(op->ptr, "sharpness"));
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -4563,10 +4582,11 @@ static int edbm_select_non_manifold_exec(bContext *C, wmOperator *op)
   const bool use_non_contiguous = RNA_boolean_get(op->ptr, "use_non_contiguous");
   const bool use_verts = RNA_boolean_get(op->ptr, "use_verts");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4667,11 +4687,12 @@ static int edbm_select_random_exec(bContext *C, wmOperator *op)
   const float randfac = RNA_float_get(op->ptr, "ratio");
   const int seed = WM_operator_properties_select_random_seed_increment_get(op);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -4797,11 +4818,12 @@ static bool edbm_select_ungrouped_poll(bContext *C)
 static int edbm_select_ungrouped_exec(bContext *C, wmOperator *op)
 {
   const bool extend = RNA_boolean_get(op->ptr, "extend");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4925,7 +4947,7 @@ static int edbm_select_axis_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit_iter = objects[ob_index];
     BMEditMesh *em_iter = BKE_editmesh_from_object(obedit_iter);
@@ -5023,10 +5045,11 @@ void MESH_OT_select_axis(wmOperatorType *ot)
 
 static int edbm_region_to_loop_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -5255,10 +5278,11 @@ static int edbm_loop_to_region_exec(bContext *C, wmOperator *op)
 {
   const bool select_bigger = RNA_boolean_get(op->ptr, "select_bigger");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
diff --git a/source/blender/editors/mesh/editmesh_select_similar.c b/source/blender/editors/mesh/editmesh_select_similar.c
index c931cb4948b..47c76b7709b 100644
--- a/source/blender/editors/mesh/editmesh_select_similar.c
+++ b/source/blender/editors/mesh/editmesh_select_similar.c
@@ -12,6 +12,8 @@
 #include "BLI_listbase.h"
 #include "BLI_math.h"
 
+#include "BLT_translation.h"
+
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_deform.h"
@@ -145,6 +147,7 @@ static void face_to_plane(const Object *ob, BMFace *face, float r_plane[4])
  */
 static int similar_face_select_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   const int type = RNA_enum_get(op->ptr, "type");
@@ -155,7 +158,7 @@ static int similar_face_select_exec(bContext *C, wmOperator *op)
   int tot_faces_selected_all = 0;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -618,6 +621,7 @@ static bool edge_data_value_set(BMEdge *edge, const int hflag, int *r_value)
  */
 static int similar_edge_select_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   const int type = RNA_enum_get(op->ptr, "type");
@@ -629,7 +633,7 @@ static int similar_edge_select_exec(bContext *C, wmOperator *op)
   int tot_edges_selected_all = 0;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -968,6 +972,7 @@ static int similar_edge_select_exec(bContext *C, wmOperator *op)
 
 static int similar_vert_select_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   /* get the type from RNA */
@@ -979,7 +984,7 @@ static int similar_vert_select_exec(bContext *C, wmOperator *op)
   int tot_verts_selected_all = 0;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1416,6 +1421,7 @@ void MESH_OT_select_similar(wmOperatorType *ot)
 
   /* properties */
   prop = ot->prop = RNA_def_enum(ot->srna, "type", prop_similar_types, SIMVERT_NORMAL, "Type", "");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_MESH);
   RNA_def_enum_funcs(prop, select_similar_type_itemf);
 
   RNA_def_enum(ot->srna, "compare", prop_similar_compare_types, SIM_CMP_EQ, "Compare", "");
diff --git a/source/blender/editors/mesh/editmesh_tools.c b/source/blender/editors/mesh/editmesh_tools.c
index 1febc429edc..9f3ef8af17d 100644
--- a/source/blender/editors/mesh/editmesh_tools.c
+++ b/source/blender/editors/mesh/editmesh_tools.c
@@ -93,10 +93,11 @@ static int edbm_subdivide_exec(bContext *C, wmOperator *op)
   const int quad_corner_type = RNA_enum_get(op->ptr, "quadcorner");
   const int seed = RNA_int_get(op->ptr, "seed");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -289,11 +290,11 @@ static void mesh_operator_edgering_props_get(wmOperator *op, struct EdgeRingOpSu
 
 static int edbm_subdivide_edge_ring_exec(bContext *C, wmOperator *op)
 {
-
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   struct EdgeRingOpSubdProps op_props;
 
   mesh_operator_edgering_props_get(op, &op_props);
@@ -358,10 +359,11 @@ void MESH_OT_subdivide_edgering(wmOperatorType *ot)
 static int edbm_unsubdivide_exec(bContext *C, wmOperator *op)
 {
   const int iterations = RNA_int_get(op->ptr, "iterations");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -444,11 +446,12 @@ static void edbm_report_delete_info(ReportList *reports,
 
 static int edbm_delete_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   bool changed_multi = false;
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -587,13 +590,14 @@ static bool bm_face_is_loose(BMFace *f)
 
 static int edbm_delete_loose_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int totelem_old_sel[3];
   int totelem_old[3];
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   EDBM_mesh_stats_multi(objects, objects_len, totelem_old, totelem_old_sel);
 
@@ -695,10 +699,11 @@ void MESH_OT_delete_loose(wmOperatorType *ot)
 
 static int edbm_collapse_edge_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -928,15 +933,16 @@ static int edbm_add_edge_face_exec(bContext *C, wmOperator *op)
 {
   /* When this is used to dissolve we could avoid this, but checking isn't too slow. */
   bool changed_multi = false;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
 
-    if ((em->bm->totvertsel == 0) && (em->bm->totedgesel == 0) && (em->bm->totvertsel == 0)) {
+    if ((em->bm->totvertsel == 0) && (em->bm->totedgesel == 0) && (em->bm->totfacesel == 0)) {
       continue;
     }
 
@@ -1049,7 +1055,7 @@ static int edbm_mark_seam_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -1129,11 +1135,12 @@ static int edbm_mark_sharp_exec(bContext *C, wmOperator *op)
   BMIter iter;
   const bool clear = RNA_boolean_get(op->ptr, "clear");
   const bool use_verts = RNA_boolean_get(op->ptr, "use_verts");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -1312,11 +1319,12 @@ static bool edbm_connect_vert_pair(BMEditMesh *em, struct Mesh *me, wmOperator *
 
 static int edbm_vert_connect_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   uint failed_objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1559,12 +1567,13 @@ static bool bm_vert_connect_select_history_edge_to_vert_path(BMesh *bm, ListBase
 
 static int edbm_vert_connect_path_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   uint failed_selection_order_len = 0;
   uint failed_connect_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1655,10 +1664,11 @@ void MESH_OT_vert_connect_path(wmOperatorType *ot)
 
 static int edbm_vert_connect_concave_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -1706,11 +1716,12 @@ void MESH_OT_vert_connect_concave(wmOperatorType *ot)
 
 static int edbm_vert_connect_nonplaner_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const float angle_limit = RNA_float_get(op->ptr, "angle_limit");
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1780,10 +1791,11 @@ void MESH_OT_vert_connect_nonplanar(wmOperatorType *ot)
 
 static int edbm_face_make_planar_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   const int repeat = RNA_int_get(op->ptr, "repeat");
   const float fac = RNA_float_get(op->ptr, "factor");
@@ -1947,10 +1959,11 @@ static int edbm_edge_split_exec(bContext *C, wmOperator *op)
 {
   const int type = RNA_enum_get(op->ptr, "type");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2012,10 +2025,11 @@ void MESH_OT_edge_split(wmOperatorType *ot)
 
 static int edbm_duplicate_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   bool changed = false;
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -2243,10 +2257,11 @@ static int edbm_flip_normals_exec(bContext *C, wmOperator *op)
 {
   const bool only_clnors = RNA_boolean_get(op->ptr, "only_clnors");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -2309,10 +2324,11 @@ static int edbm_edge_rotate_selected_exec(bContext *C, wmOperator *op)
   int tot_failed_all = 0;
   bool no_selected_edges = true, invalid_selected_edges = true;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2435,12 +2451,13 @@ void MESH_OT_edge_rotate(wmOperatorType *ot)
 static int edbm_hide_exec(bContext *C, wmOperator *op)
 {
   const bool unselected = RNA_boolean_get(op->ptr, "unselected");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bool changed = false;
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2516,11 +2533,12 @@ void MESH_OT_hide(wmOperatorType *ot)
 static int edbm_reveal_exec(bContext *C, wmOperator *op)
 {
   const bool select = RNA_boolean_get(op->ptr, "select");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2564,12 +2582,13 @@ void MESH_OT_reveal(wmOperatorType *ot)
 
 static int edbm_normals_make_consistent_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   const bool inside = RNA_boolean_get(op->ptr, "inside");
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2645,10 +2664,11 @@ static int edbm_do_smooth_vertex_exec(bContext *C, wmOperator *op)
     repeat = 1;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Mesh *me = obedit->data;
@@ -2764,6 +2784,7 @@ void MESH_OT_vertices_smooth(wmOperatorType *ot)
 static int edbm_do_smooth_laplacian_vertex_exec(bContext *C, wmOperator *op)
 {
   int tot_unselected = 0;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   const float lambda_factor = RNA_float_get(op->ptr, "lambda_factor");
@@ -2780,7 +2801,7 @@ static int edbm_do_smooth_laplacian_vertex_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2905,10 +2926,11 @@ static void mesh_set_smooth_faces(BMEditMesh *em, short smooth)
 
 static int edbm_faces_shade_smooth_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2953,10 +2975,11 @@ void MESH_OT_faces_shade_smooth(wmOperatorType *ot)
 
 static int edbm_faces_shade_flat_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -3004,10 +3027,11 @@ static int edbm_rotate_uvs_exec(bContext *C, wmOperator *op)
   /* get the direction from RNA */
   const bool use_ccw = RNA_boolean_get(op->ptr, "use_ccw");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -3040,10 +3064,11 @@ static int edbm_rotate_uvs_exec(bContext *C, wmOperator *op)
 
 static int edbm_reverse_uvs_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -3078,10 +3103,11 @@ static int edbm_rotate_colors_exec(bContext *C, wmOperator *op)
   /* get the direction from RNA */
   const bool use_ccw = RNA_boolean_get(op->ptr, "use_ccw");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -3131,10 +3157,11 @@ static int edbm_rotate_colors_exec(bContext *C, wmOperator *op)
 
 static int edbm_reverse_colors_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3376,7 +3403,7 @@ static int edbm_merge_exec(bContext *C, wmOperator *op)
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   const int type = RNA_enum_get(op->ptr, "type");
   const bool uvs = RNA_boolean_get(op->ptr, "uvs");
 
@@ -3540,10 +3567,11 @@ static int edbm_remove_doubles_exec(bContext *C, wmOperator *op)
 
   int count_multi = 0;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3686,13 +3714,14 @@ static bool shape_propagate(BMEditMesh *em)
 
 static int edbm_shape_propagate_to_all_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int tot_shapekeys = 0;
   int tot_selected_verts_objects = 0;
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Mesh *me = obedit->data;
@@ -3759,6 +3788,7 @@ static int edbm_blend_from_shape_exec(bContext *C, wmOperator *op)
   BMEditMesh *em_ref = me_ref->edit_mesh;
   BMVert *eve;
   BMIter iter;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   float co[3], *sco;
   int totshape_ref = 0;
@@ -3787,7 +3817,7 @@ static int edbm_blend_from_shape_exec(bContext *C, wmOperator *op)
   int tot_selected_verts_objects = 0;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Mesh *me = obedit->data;
@@ -3938,10 +3968,11 @@ static int edbm_solidify_exec(bContext *C, wmOperator *op)
 {
   const float thickness = RNA_float_get(op->ptr, "thickness");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -4686,7 +4717,7 @@ static int edbm_separate_exec(bContext *C, wmOperator *op)
     uint bases_len = 0;
     uint empty_selection_len = 0;
     Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &bases_len);
+        scene, view_layer, CTX_wm_view3d(C), &bases_len);
     for (uint bs_index = 0; bs_index < bases_len; bs_index++) {
       Base *base = bases[bs_index];
       BMEditMesh *em = BKE_editmesh_from_object(base->object);
@@ -4835,10 +4866,11 @@ static int edbm_fill_exec(bContext *C, wmOperator *op)
 
   bool has_selected_edges = false, has_faces_filled = false;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -5090,10 +5122,11 @@ static int edbm_fill_grid_exec(bContext *C, wmOperator *op)
 {
   const bool use_interp_simple = RNA_boolean_get(op->ptr, "use_interp_simple");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
 
     Object *obedit = objects[ob_index];
@@ -5231,10 +5264,11 @@ static int edbm_fill_holes_exec(bContext *C, wmOperator *op)
 {
   const int sides = RNA_int_get(op->ptr, "sides");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -5294,10 +5328,11 @@ void MESH_OT_fill_holes(wmOperatorType *ot)
 
 static int edbm_beautify_fill_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   const float angle_max = M_PI;
   const float angle_limit = RNA_float_get(op->ptr, "angle_limit");
@@ -5392,10 +5427,11 @@ static int edbm_poke_face_exec(bContext *C, wmOperator *op)
   const bool use_relative_offset = RNA_boolean_get(op->ptr, "use_relative_offset");
   const int center_mode = RNA_enum_get(op->ptr, "center_mode");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -5488,11 +5524,12 @@ static int edbm_quads_convert_to_tris_exec(bContext *C, wmOperator *op)
 {
   const int quad_method = RNA_enum_get(op->ptr, "quad_method");
   const int ngon_method = RNA_enum_get(op->ptr, "ngon_method");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -5582,11 +5619,12 @@ void MESH_OT_quads_convert_to_tris(wmOperatorType *ot)
 
 static int edbm_tris_convert_to_quads_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   const bool do_seam = RNA_boolean_get(op->ptr, "seam");
   const bool do_sharp = RNA_boolean_get(op->ptr, "sharp");
@@ -5743,10 +5781,11 @@ static int edbm_decimate_exec(bContext *C, wmOperator *op)
     return OPERATOR_FINISHED;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -5960,10 +5999,11 @@ static int edbm_dissolve_verts_exec(bContext *C, wmOperator *op)
   const bool use_face_split = RNA_boolean_get(op->ptr, "use_face_split");
   const bool use_boundary_tear = RNA_boolean_get(op->ptr, "use_boundary_tear");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -6027,10 +6067,11 @@ static int edbm_dissolve_edges_exec(bContext *C, wmOperator *op)
   const bool use_verts = RNA_boolean_get(op->ptr, "use_verts");
   const bool use_face_split = RNA_boolean_get(op->ptr, "use_face_split");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -6092,10 +6133,11 @@ void MESH_OT_dissolve_edges(wmOperatorType *ot)
 static int edbm_dissolve_faces_exec(bContext *C, wmOperator *op)
 {
   const bool use_verts = RNA_boolean_get(op->ptr, "use_verts");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -6208,10 +6250,11 @@ static int edbm_dissolve_limited_exec(bContext *C, wmOperator *op)
   const int delimit = RNA_enum_get(op->ptr, "delimit");
   char dissolve_flag;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -6329,13 +6372,14 @@ void MESH_OT_dissolve_limited(wmOperatorType *ot)
 
 static int edbm_dissolve_degenerate_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   int totelem_old[3] = {0, 0, 0};
   int totelem_new[3] = {0, 0, 0};
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -6413,11 +6457,12 @@ void MESH_OT_dissolve_degenerate(wmOperatorType *ot)
 static int edbm_delete_edgeloop_exec(bContext *C, wmOperator *op)
 {
   const bool use_face_split = RNA_boolean_get(op->ptr, "use_face_split");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -6497,10 +6542,11 @@ void MESH_OT_delete_edgeloop(wmOperatorType *ot)
 
 static int edbm_split_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -7092,7 +7138,7 @@ static int edbm_sort_elements_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -7396,11 +7442,12 @@ static int edbm_bridge_edge_loops_exec(bContext *C, wmOperator *op)
   const bool use_merge = RNA_boolean_get(op->ptr, "use_merge");
   const float merge_factor = RNA_float_get(op->ptr, "merge_factor");
   const int twist_offset = RNA_int_get(op->ptr, "twist_offset");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -7476,10 +7523,11 @@ static int edbm_wireframe_exec(bContext *C, wmOperator *op)
   const float thickness = RNA_float_get(op->ptr, "thickness");
   const float offset = RNA_float_get(op->ptr, "offset");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -7587,7 +7635,7 @@ static int edbm_offset_edgeloop_exec(bContext *C, wmOperator *op)
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     Object *obedit = bases[base_index]->object;
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -7676,10 +7724,11 @@ static int edbm_convex_hull_exec(bContext *C, wmOperator *op)
   float angle_face_threshold = RNA_float_get(op->ptr, "face_threshold");
   float angle_shape_threshold = RNA_float_get(op->ptr, "shape_threshold");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -7809,10 +7858,11 @@ void MESH_OT_convex_hull(wmOperatorType *ot)
 static int mesh_symmetrize_exec(bContext *C, wmOperator *op)
 {
   const float thresh = RNA_float_get(op->ptr, "threshold");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -7908,10 +7958,11 @@ static int mesh_symmetry_snap_exec(bContext *C, wmOperator *op)
   int axis = axis_dir % 3;
   bool axis_sign = axis != axis_dir;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -8074,11 +8125,12 @@ static int edbm_mark_freestyle_edge_exec(bContext *C, wmOperator *op)
   BMIter iter;
   FreestyleEdge *fed;
   const bool clear = RNA_boolean_get(op->ptr, "clear");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -8154,11 +8206,12 @@ static int edbm_mark_freestyle_face_exec(bContext *C, wmOperator *op)
   BMIter iter;
   FreestyleFace *ffa;
   const bool clear = RNA_boolean_get(op->ptr, "clear");
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -8692,7 +8745,7 @@ static int edbm_point_normals_modal(bContext *C, wmOperator *op, const wmEvent *
    * Free the data here, then use #point_normals_ensure to add it back on demand. */
   if (ret == OPERATOR_PASS_THROUGH) {
     /* Don't free on mouse-move, causes creation/freeing of the loop data in an inefficient way. */
-    if (!ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+    if (!ISMOUSE_MOTION(event->type)) {
       point_normals_free(op);
     }
   }
@@ -8952,10 +9005,11 @@ static void normals_split(BMesh *bm)
 
 static int normals_split_merge(bContext *C, const bool do_merge)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -9081,10 +9135,11 @@ static EnumPropertyItem average_method_items[] = {
 
 static int edbm_average_normals_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   const int average_type = RNA_enum_get(op->ptr, "average_type");
   const float absweight = (float)RNA_int_get(op->ptr, "weight");
   const float threshold = RNA_float_get(op->ptr, "threshold");
@@ -9332,7 +9387,7 @@ static int edbm_normals_tools_exec(bContext *C, wmOperator *op)
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   const int mode = RNA_enum_get(op->ptr, "mode");
   const bool absolute = RNA_boolean_get(op->ptr, "absolute");
   float *normal_vector = scene->toolsettings->normal_vector;
@@ -9547,10 +9602,11 @@ void MESH_OT_normals_tools(struct wmOperatorType *ot)
 
 static int edbm_set_normals_from_faces_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -9662,10 +9718,11 @@ void MESH_OT_set_normals_from_faces(struct wmOperatorType *ot)
 
 static int edbm_smooth_normals_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -9783,10 +9840,11 @@ void MESH_OT_smooth_normals(struct wmOperatorType *ot)
 
 static int edbm_mod_weighted_strength_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/mesh/editmesh_undo.c b/source/blender/editors/mesh/editmesh_undo.c
index d75c92f963f..44fab751de2 100644
--- a/source/blender/editors/mesh/editmesh_undo.c
+++ b/source/blender/editors/mesh/editmesh_undo.c
@@ -361,8 +361,6 @@ static void um_arraystore_compact_ex(UndoMesh *um, const UndoMesh *um_ref, bool
   if (create) {
     um_arraystore.users += 1;
   }
-
-  BKE_mesh_update_customdata_pointers(me, false);
 }
 
 /**
@@ -465,9 +463,6 @@ static void um_arraystore_expand(UndoMesh *um)
     BLI_assert(me->totselect == (state_len / stride));
     UNUSED_VARS_NDEBUG(stride);
   }
-
-  /* not essential, but prevents accidental dangling pointer access */
-  BKE_mesh_update_customdata_pointers(me, false);
 }
 
 static void um_arraystore_free(UndoMesh *um)
@@ -594,6 +589,10 @@ static void *undomesh_from_editmesh(UndoMesh *um, BMEditMesh *em, Key *key, Undo
   /* Uncomment for troubleshooting. */
   // BM_mesh_validate(em->bm);
 
+  /* Copy the ID name characters to the mesh so code that depends on accessing the ID type can work
+   * on it. Necessary to use the attribute API. */
+  strcpy(um->me.id.name, "MEundomesh_from_editmesh");
+
   BM_mesh_bm_to_me(
       NULL,
       em->bm,
@@ -731,8 +730,10 @@ static void undomesh_free_data(UndoMesh *um)
 
 static Object *editmesh_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && obedit->type == OB_MESH) {
     Mesh *me = obedit->data;
     if (me->edit_mesh != NULL) {
@@ -772,10 +773,11 @@ static bool mesh_undosys_step_encode(struct bContext *C, struct Main *bmain, Und
 
   /* Important not to use the 3D view when getting objects because all objects
    * outside of this list will be moved out of edit-mode when reading back undo steps. */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   ToolSettings *ts = CTX_data_tool_settings(C);
   uint objects_len = 0;
-  Object **objects = ED_undo_editmode_objects_from_view_layer(view_layer, &objects_len);
+  Object **objects = ED_undo_editmode_objects_from_view_layer(scene, view_layer, &objects_len);
 
   us->elems = MEM_callocN(sizeof(*us->elems) * objects_len, __func__);
   us->elems_len = objects_len;
diff --git a/source/blender/editors/mesh/editmesh_utils.c b/source/blender/editors/mesh/editmesh_utils.c
index 83968955583..5c8ff930eb8 100644
--- a/source/blender/editors/mesh/editmesh_utils.c
+++ b/source/blender/editors/mesh/editmesh_utils.c
@@ -593,45 +593,393 @@ UvMapVert *BM_uv_vert_map_at_index(UvVertMap *vmap, uint v)
   return vmap->vert[v];
 }
 
+struct UvElement **BM_uv_element_map_ensure_head_table(struct UvElementMap *element_map)
+{
+  if (element_map->head_table) {
+    return element_map->head_table;
+  }
+
+  /* For each UvElement, locate the "separate" UvElement that precedes it in the linked list. */
+  element_map->head_table = MEM_mallocN(sizeof(*element_map->head_table) * element_map->total_uvs,
+                                        "uv_element_map_head_table");
+  UvElement **head_table = element_map->head_table;
+  for (int i = 0; i < element_map->total_uvs; i++) {
+    UvElement *head = element_map->storage + i;
+    if (head->separate) {
+      UvElement *element = head;
+      while (element) {
+        head_table[element - element_map->storage] = head;
+        element = element->next;
+        if (element && element->separate) {
+          break;
+        }
+      }
+    }
+  }
+  return element_map->head_table;
+}
+
+#define INVALID_ISLAND ((unsigned int)-1)
+
+static void bm_uv_assign_island(UvElementMap *element_map,
+                                UvElement *element,
+                                int nisland,
+                                uint *map,
+                                UvElement *islandbuf,
+                                int islandbufsize)
+{
+  element->island = nisland;
+  map[element - element_map->storage] = islandbufsize;
+
+  /* Copy *element to islandbuf[islandbufsize]. */
+  islandbuf[islandbufsize].l = element->l;
+  islandbuf[islandbufsize].separate = element->separate;
+  islandbuf[islandbufsize].loop_of_poly_index = element->loop_of_poly_index;
+  islandbuf[islandbufsize].island = element->island;
+  islandbuf[islandbufsize].flag = element->flag;
+}
+
+static int bm_uv_edge_select_build_islands(UvElementMap *element_map,
+                                           const Scene *scene,
+                                           UvElement *islandbuf,
+                                           uint *map,
+                                           bool uv_selected,
+                                           const int cd_loop_uv_offset)
+{
+  BM_uv_element_map_ensure_head_table(element_map);
+
+  int total_uvs = element_map->total_uvs;
+
+  /* Depth first search the graph, building islands as we go. */
+  int nislands = 0;
+  int islandbufsize = 0;
+  int stack_upper_bound = total_uvs;
+  UvElement **stack_uv = MEM_mallocN(sizeof(*stack_uv) * stack_upper_bound,
+                                     "uv_island_element_stack");
+  int stacksize_uv = 0;
+  for (int i = 0; i < total_uvs; i++) {
+    UvElement *element = element_map->storage + i;
+    if (element->island != INVALID_ISLAND) {
+      /* Unique UV (element and all it's children) are already part of an island. */
+      continue;
+    }
+
+    /* Create a new island, i.e. nislands++. */
+
+    BLI_assert(element->separate); /* Ensure we're the head of this unique UV. */
+
+    /* Seed the graph search. */
+    stack_uv[stacksize_uv++] = element;
+    while (element) {
+      bm_uv_assign_island(element_map, element, nislands, map, islandbuf, islandbufsize++);
+      element = element->next;
+      if (element && element->separate) {
+        break;
+      }
+    }
+
+    /* Traverse the graph. */
+    while (stacksize_uv) {
+      BLI_assert(stacksize_uv < stack_upper_bound);
+      element = stack_uv[--stacksize_uv];
+      while (element) {
+
+        /* Scan forwards around the BMFace that contains element->l. */
+        if (!uv_selected || uvedit_edge_select_test(scene, element->l, cd_loop_uv_offset)) {
+          UvElement *next = BM_uv_element_get(element_map, element->l->next->f, element->l->next);
+          if (next->island == INVALID_ISLAND) {
+            UvElement *tail = element_map->head_table[next - element_map->storage];
+            stack_uv[stacksize_uv++] = tail;
+            while (tail) {
+              bm_uv_assign_island(element_map, tail, nislands, map, islandbuf, islandbufsize++);
+              tail = tail->next;
+              if (tail && tail->separate) {
+                break;
+              }
+            }
+          }
+        }
+
+        /* Scan backwards around the BMFace that contains element->l. */
+        if (!uv_selected || uvedit_edge_select_test(scene, element->l->prev, cd_loop_uv_offset)) {
+          UvElement *prev = BM_uv_element_get(element_map, element->l->prev->f, element->l->prev);
+          if (prev->island == INVALID_ISLAND) {
+            UvElement *tail = element_map->head_table[prev - element_map->storage];
+            stack_uv[stacksize_uv++] = tail;
+            while (tail) {
+              bm_uv_assign_island(element_map, tail, nislands, map, islandbuf, islandbufsize++);
+              tail = tail->next;
+              if (tail && tail->separate) {
+                break;
+              }
+            }
+          }
+        }
+
+        /* The same for all the UvElements in this unique UV. */
+        element = element->next;
+        if (element && element->separate) {
+          break;
+        }
+      }
+    }
+    nislands++;
+  }
+  BLI_assert(islandbufsize == total_uvs);
+
+  MEM_SAFE_FREE(stack_uv);
+  MEM_SAFE_FREE(element_map->head_table);
+
+  return nislands;
+}
+
+static void bm_uv_build_islands(UvElementMap *element_map,
+                                BMesh *bm,
+                                const Scene *scene,
+                                bool uv_selected)
+{
+  int totuv = element_map->total_uvs;
+  int nislands = 0;
+  int islandbufsize = 0;
+
+  /* map holds the map from current vmap->buf to the new, sorted map */
+  uint *map = MEM_mallocN(sizeof(*map) * totuv, "uvelement_remap");
+  BMFace **stack = MEM_mallocN(sizeof(*stack) * bm->totface, "uv_island_face_stack");
+  UvElement *islandbuf = MEM_callocN(sizeof(*islandbuf) * totuv, "uvelement_island_buffer");
+  /* Island number for BMFaces. */
+  int *island_number = MEM_callocN(sizeof(*island_number) * bm->totface, "uv_island_number_face");
+  copy_vn_i(island_number, bm->totface, INVALID_ISLAND);
+
+  const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV);
+
+  const bool use_uv_edge_connectivity = scene->toolsettings->uv_flag & UV_SYNC_SELECTION ?
+                                            scene->toolsettings->selectmode & SCE_SELECT_EDGE :
+                                            scene->toolsettings->uv_selectmode & UV_SELECT_EDGE;
+  if (use_uv_edge_connectivity) {
+    nislands = bm_uv_edge_select_build_islands(
+        element_map, scene, islandbuf, map, uv_selected, cd_loop_uv_offset);
+    islandbufsize = totuv;
+  }
+
+  for (int i = 0; i < totuv; i++) {
+    if (element_map->storage[i].island == INVALID_ISLAND) {
+      int stacksize = 0;
+      element_map->storage[i].island = nislands;
+      stack[0] = element_map->storage[i].l->f;
+      island_number[BM_elem_index_get(stack[0])] = nislands;
+      stacksize = 1;
+
+      while (stacksize > 0) {
+        BMFace *efa = stack[--stacksize];
+
+        BMLoop *l;
+        BMIter liter;
+        BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+          if (uv_selected && !uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
+            continue;
+          }
+
+          UvElement *initelement = element_map->vertex[BM_elem_index_get(l->v)];
+
+          for (UvElement *element = initelement; element; element = element->next) {
+            if (element->separate) {
+              initelement = element;
+            }
+
+            if (element->l->f == efa) {
+              /* found the uv corresponding to our face and vertex.
+               * Now fill it to the buffer */
+              bm_uv_assign_island(element_map, element, nislands, map, islandbuf, islandbufsize++);
+
+              for (element = initelement; element; element = element->next) {
+                if (element->separate && element != initelement) {
+                  break;
+                }
+
+                if (island_number[BM_elem_index_get(element->l->f)] == INVALID_ISLAND) {
+                  stack[stacksize++] = element->l->f;
+                  island_number[BM_elem_index_get(element->l->f)] = nislands;
+                }
+              }
+              break;
+            }
+          }
+        }
+      }
+
+      nislands++;
+    }
+  }
+
+  MEM_SAFE_FREE(island_number);
+
+  /* remap */
+  for (int i = 0; i < bm->totvert; i++) {
+    /* important since we may do selection only. Some of these may be NULL */
+    if (element_map->vertex[i]) {
+      element_map->vertex[i] = &islandbuf[map[element_map->vertex[i] - element_map->storage]];
+    }
+  }
+
+  element_map->island_indices = MEM_callocN(sizeof(*element_map->island_indices) * nislands,
+                                            __func__);
+  element_map->island_total_uvs = MEM_callocN(sizeof(*element_map->island_total_uvs) * nislands,
+                                              __func__);
+  element_map->island_total_unique_uvs = MEM_callocN(
+      sizeof(*element_map->island_total_unique_uvs) * nislands, __func__);
+  int j = 0;
+  for (int i = 0; i < totuv; i++) {
+    UvElement *next = element_map->storage[i].next;
+    islandbuf[map[i]].next = next ? &islandbuf[map[next - element_map->storage]] : NULL;
+
+    if (islandbuf[i].island != j) {
+      j++;
+      element_map->island_indices[j] = i;
+    }
+    BLI_assert(islandbuf[i].island == j);
+    element_map->island_total_uvs[j]++;
+    if (islandbuf[i].separate) {
+      element_map->island_total_unique_uvs[j]++;
+    }
+  }
+
+  MEM_SAFE_FREE(element_map->storage);
+  element_map->storage = islandbuf;
+  islandbuf = NULL;
+  element_map->total_islands = nislands;
+  MEM_SAFE_FREE(stack);
+  MEM_SAFE_FREE(map);
+}
+
+/* return true if `loop` has UV co-ordinates which match `luv_a` and `luv_b` */
+static bool loop_uv_match(BMLoop *loop, MLoopUV *luv_a, MLoopUV *luv_b, int cd_loop_uv_offset)
+{
+  MLoopUV *luv_c = BM_ELEM_CD_GET_VOID_P(loop, cd_loop_uv_offset);
+  MLoopUV *luv_d = BM_ELEM_CD_GET_VOID_P(loop->next, cd_loop_uv_offset);
+  return compare_v2v2(luv_a->uv, luv_c->uv, STD_UV_CONNECT_LIMIT) &&
+         compare_v2v2(luv_b->uv, luv_d->uv, STD_UV_CONNECT_LIMIT);
+}
+
+/* Given `anchor` and `edge`, return true if there are edges that fan between them that are
+ * seam-free. */
+static bool seam_connected_recursive(BMVert *anchor,
+                                     BMEdge *edge,
+                                     MLoopUV *luv_anchor,
+                                     MLoopUV *luv_fan,
+                                     BMLoop *needle,
+                                     GSet *visited,
+                                     int cd_loop_uv_offset)
+{
+  BLI_assert(edge->v1 == anchor || edge->v2 == anchor);
+  BLI_assert(needle->v == anchor || needle->next->v == anchor);
+
+  if (BM_elem_flag_test(edge, BM_ELEM_SEAM)) {
+    return false; /* Edge is a seam, don't traverse. */
+  }
+
+  if (!BLI_gset_add(visited, edge)) {
+    return false; /* Already visited. */
+  }
+
+  BMLoop *loop;
+  BMIter liter;
+  BM_ITER_ELEM (loop, &liter, edge, BM_LOOPS_OF_EDGE) {
+    if (loop->v == anchor) {
+      if (!loop_uv_match(loop, luv_anchor, luv_fan, cd_loop_uv_offset)) {
+        continue; /* `loop` is disjoint in UV space. */
+      }
+
+      if (loop->prev == needle) {
+        return true; /* Success. */
+      }
+
+      MLoopUV *luv_far = BM_ELEM_CD_GET_VOID_P(loop->prev, cd_loop_uv_offset);
+      if (seam_connected_recursive(
+              anchor, loop->prev->e, luv_anchor, luv_far, needle, visited, cd_loop_uv_offset)) {
+        return true;
+      }
+    }
+    else {
+      BLI_assert(loop->next->v == anchor);
+      if (!loop_uv_match(loop, luv_fan, luv_anchor, cd_loop_uv_offset)) {
+        continue; /* `loop` is disjoint in UV space. */
+      }
+
+      if (loop->next == needle) {
+        return true; /* Success. */
+      }
+
+      MLoopUV *luv_far = BM_ELEM_CD_GET_VOID_P(loop->next->next, cd_loop_uv_offset);
+      if (seam_connected_recursive(
+              anchor, loop->next->e, luv_anchor, luv_far, needle, visited, cd_loop_uv_offset)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+/* Given `loop_a` and `loop_b` originate from the same vertex and share a UV,
+ * return true if there are edges that fan between them that are seam-free.
+ * return false otherwise.
+ */
+static bool seam_connected(BMLoop *loop_a, BMLoop *loop_b, GSet *visited, int cd_loop_uv_offset)
+{
+  BLI_assert(loop_a && loop_b);
+  BLI_assert(loop_a != loop_b);
+  BLI_assert(loop_a->v == loop_b->v);
+
+  BLI_gset_clear(visited, NULL);
+
+  MLoopUV *luv_anchor = BM_ELEM_CD_GET_VOID_P(loop_a, cd_loop_uv_offset);
+  MLoopUV *luv_fan = BM_ELEM_CD_GET_VOID_P(loop_a->next, cd_loop_uv_offset);
+  const bool result = seam_connected_recursive(
+      loop_a->v, loop_a->e, luv_anchor, luv_fan, loop_b, visited, cd_loop_uv_offset);
+  return result;
+}
+
 UvElementMap *BM_uv_element_map_create(BMesh *bm,
                                        const Scene *scene,
-                                       const bool face_selected,
                                        const bool uv_selected,
                                        const bool use_winding,
+                                       const bool use_seams,
                                        const bool do_islands)
 {
+  /* In uv sync selection, all UVs are visible. */
+  const bool face_selected = !(scene->toolsettings->uv_flag & UV_SYNC_SELECTION);
+
   BMVert *ev;
   BMFace *efa;
-  BMLoop *l;
   BMIter iter, liter;
-  /* vars from original func */
-  UvElementMap *element_map;
-  UvElement *buf;
-  bool *winding = NULL;
   BLI_buffer_declare_static(vec2f, tf_uv_buf, BLI_BUFFER_NOP, BM_DEFAULT_NGON_STACK_SIZE);
-
   MLoopUV *luv;
-  int totverts, totfaces, i, totuv, j;
-
   const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV);
+  if (cd_loop_uv_offset < 0) {
+    return NULL;
+  }
 
   BM_mesh_elem_index_ensure(bm, BM_VERT | BM_FACE);
 
-  totfaces = bm->totface;
-  totverts = bm->totvert;
-  totuv = 0;
-
-  /* generate UvElement array */
+  /* Count total uvs. */
+  int totuv = 0;
   BM_ITER_MESH (efa, &iter, bm, BM_FACES_OF_MESH) {
-    if (!face_selected || BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
-      if (!uv_selected) {
-        totuv += efa->len;
-      }
-      else {
-        BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
-          if (uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
-            totuv++;
-          }
+    if (BM_elem_flag_test(efa, BM_ELEM_HIDDEN)) {
+      continue;
+    }
+
+    if (face_selected && !BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
+      continue;
+    }
+
+    if (!uv_selected) {
+      totuv += efa->len;
+    }
+    else {
+      BMLoop *l;
+      BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+        if (uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
+          totuv++;
         }
       }
     }
@@ -641,93 +989,114 @@ UvElementMap *BM_uv_element_map_create(BMesh *bm,
     return NULL;
   }
 
-  element_map = (UvElementMap *)MEM_callocN(sizeof(*element_map), "UvElementMap");
-  element_map->totalUVs = totuv;
-  element_map->vert = (UvElement **)MEM_callocN(sizeof(*element_map->vert) * totverts,
-                                                "UvElementVerts");
-  buf = element_map->buf = (UvElement *)MEM_callocN(sizeof(*element_map->buf) * totuv,
-                                                    "UvElement");
+  UvElementMap *element_map = (UvElementMap *)MEM_callocN(sizeof(*element_map), "UvElementMap");
+  element_map->total_uvs = totuv;
+  element_map->vertex = (UvElement **)MEM_callocN(sizeof(*element_map->vertex) * bm->totvert,
+                                                  "UvElementVerts");
+  element_map->storage = (UvElement *)MEM_callocN(sizeof(*element_map->storage) * totuv,
+                                                  "UvElement");
 
-  if (use_winding) {
-    winding = MEM_mallocN(sizeof(*winding) * totfaces, "winding");
-  }
+  bool *winding = use_winding ? MEM_callocN(sizeof(*winding) * bm->totface, "winding") : NULL;
 
+  UvElement *buf = element_map->storage;
+  int j;
   BM_ITER_MESH_INDEX (efa, &iter, bm, BM_FACES_OF_MESH, j) {
 
-    if (use_winding) {
-      winding[j] = false;
+    if (BM_elem_flag_test(efa, BM_ELEM_HIDDEN)) {
+      continue;
     }
 
-    if (!face_selected || BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
-      float(*tf_uv)[2] = NULL;
-
-      if (use_winding) {
-        tf_uv = (float(*)[2])BLI_buffer_reinit_data(&tf_uv_buf, vec2f, efa->len);
-      }
+    if (face_selected && !BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
+      continue;
+    }
 
-      BM_ITER_ELEM_INDEX (l, &liter, efa, BM_LOOPS_OF_FACE, i) {
-        if (uv_selected && !uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
-          continue;
-        }
+    float(*tf_uv)[2] = NULL;
 
-        buf->l = l;
-        buf->separate = 0;
-        buf->island = INVALID_ISLAND;
-        buf->loop_of_poly_index = i;
+    if (use_winding) {
+      tf_uv = (float(*)[2])BLI_buffer_reinit_data(&tf_uv_buf, vec2f, efa->len);
+    }
 
-        buf->next = element_map->vert[BM_elem_index_get(l->v)];
-        element_map->vert[BM_elem_index_get(l->v)] = buf;
+    int i;
+    BMLoop *l;
+    BM_ITER_ELEM_INDEX (l, &liter, efa, BM_LOOPS_OF_FACE, i) {
+      if (uv_selected && !uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
+        continue;
+      }
 
-        if (use_winding) {
-          luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-          copy_v2_v2(tf_uv[i], luv->uv);
-        }
+      buf->l = l;
+      buf->island = INVALID_ISLAND;
+      buf->loop_of_poly_index = i;
 
-        buf++;
-      }
+      /* Insert to head of linked list associated with BMVert. */
+      buf->next = element_map->vertex[BM_elem_index_get(l->v)];
+      element_map->vertex[BM_elem_index_get(l->v)] = buf;
 
       if (use_winding) {
-        winding[j] = cross_poly_v2(tf_uv, efa->len) > 0;
+        luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+        copy_v2_v2(tf_uv[i], luv->uv);
       }
+
+      buf++;
+    }
+
+    if (winding) {
+      winding[j] = cross_poly_v2(tf_uv, efa->len) > 0;
     }
   }
+  BLI_buffer_free(&tf_uv_buf);
 
-  /* sort individual uvs for each vert */
-  BM_ITER_MESH_INDEX (ev, &iter, bm, BM_VERTS_OF_MESH, i) {
-    UvElement *newvlist = NULL, *vlist = element_map->vert[i];
-    UvElement *iterv, *v, *lastv, *next;
-    const float *uv, *uv2;
-    bool uv_vert_sel, uv2_vert_sel;
+  GSet *seam_visited_gset = use_seams ? BLI_gset_ptr_new(__func__) : NULL;
 
+  /* For each BMVert, sort associated linked list into unique uvs. */
+  int ev_index;
+  BM_ITER_MESH_INDEX (ev, &iter, bm, BM_VERTS_OF_MESH, ev_index) {
+    UvElement *newvlist = NULL;
+    UvElement *vlist = element_map->vertex[ev_index];
     while (vlist) {
-      v = vlist;
+
+      /* Detach head from unsorted list. */
+      UvElement *v = vlist;
       vlist = vlist->next;
       v->next = newvlist;
       newvlist = v;
 
-      l = v->l;
-      luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-      uv = luv->uv;
-      uv_vert_sel = uvedit_uv_select_test(scene, l, cd_loop_uv_offset);
+      luv = BM_ELEM_CD_GET_VOID_P(v->l, cd_loop_uv_offset);
+      const float *uv = luv->uv;
+      bool uv_vert_sel = uvedit_uv_select_test(scene, v->l, cd_loop_uv_offset);
 
-      lastv = NULL;
-      iterv = vlist;
+      UvElement *lastv = NULL;
+      UvElement *iterv = vlist;
 
+      /* Scan through unsorted list, finding UvElements which are connected to `v`. */
       while (iterv) {
-        next = iterv->next;
+        UvElement *next = iterv->next;
+        luv = BM_ELEM_CD_GET_VOID_P(iterv->l, cd_loop_uv_offset);
 
-        l = iterv->l;
-        luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-        uv2 = luv->uv;
-        uv2_vert_sel = uvedit_uv_select_test(scene, l, cd_loop_uv_offset);
+        bool connected = true; /* Assume connected unless we can prove otherwise. */
+
+        if (connected) {
+          /* Are the two UVs close together? */
+          const float *uv2 = luv->uv;
+          connected = compare_v2v2(uv2, uv, STD_UV_CONNECT_LIMIT);
+        }
+
+        if (connected) {
+          /* Check if the uv loops share the same selection state (if not, they are not connected
+           * as they have been ripped or other edit commands have separated them). */
+          const bool uv2_vert_sel = uvedit_uv_select_test(scene, iterv->l, cd_loop_uv_offset);
+          connected = (uv_vert_sel == uv2_vert_sel);
+        }
+
+        if (connected && use_winding) {
+          connected = winding[BM_elem_index_get(iterv->l->f)] ==
+                      winding[BM_elem_index_get(v->l->f)];
+        }
 
-        /* Check if the uv loops share the same selection state (if not, they are not connected as
-         * they have been ripped or other edit commands have separated them). */
-        const bool connected = (uv_vert_sel == uv2_vert_sel) &&
-                               compare_v2v2(uv2, uv, STD_UV_CONNECT_LIMIT);
+        if (connected && use_seams) {
+          connected = seam_connected(iterv->l, v->l, seam_visited_gset, cd_loop_uv_offset);
+        }
 
-        if (connected && (!use_winding || winding[BM_elem_index_get(iterv->l->f)] ==
-                                              winding[BM_elem_index_get(v->l->f)])) {
+        if (connected) {
           if (lastv) {
             lastv->next = next;
           }
@@ -744,126 +1113,34 @@ UvElementMap *BM_uv_element_map_create(BMesh *bm,
         iterv = next;
       }
 
-      newvlist->separate = 1;
+      element_map->total_unique_uvs++;
+      newvlist->separate = true;
     }
 
-    element_map->vert[i] = newvlist;
+    /* Write back sorted list. */
+    element_map->vertex[ev_index] = newvlist;
   }
 
-  if (use_winding) {
-    MEM_freeN(winding);
+  if (seam_visited_gset) {
+    BLI_gset_free(seam_visited_gset, NULL);
+    seam_visited_gset = NULL;
   }
+  MEM_SAFE_FREE(winding);
 
+  /* at this point, every UvElement in vert points to a UvElement sharing the same vertex.
+   * Now we should sort uv's in islands. */
   if (do_islands) {
-    uint *map;
-    BMFace **stack;
-    int stacksize = 0;
-    UvElement *islandbuf;
-    /* island number for faces */
-    int *island_number = NULL;
-
-    int nislands = 0, islandbufsize = 0;
-
-    /* map holds the map from current vmap->buf to the new, sorted map */
-    map = MEM_mallocN(sizeof(*map) * totuv, "uvelement_remap");
-    stack = MEM_mallocN(sizeof(*stack) * bm->totface, "uv_island_face_stack");
-    islandbuf = MEM_callocN(sizeof(*islandbuf) * totuv, "uvelement_island_buffer");
-    island_number = MEM_mallocN(sizeof(*island_number) * totfaces, "uv_island_number_face");
-    copy_vn_i(island_number, totfaces, INVALID_ISLAND);
-
-    /* at this point, every UvElement in vert points to a UvElement sharing the same vertex.
-     * Now we should sort uv's in islands. */
-    for (i = 0; i < totuv; i++) {
-      if (element_map->buf[i].island == INVALID_ISLAND) {
-        element_map->buf[i].island = nislands;
-        stack[0] = element_map->buf[i].l->f;
-        island_number[BM_elem_index_get(stack[0])] = nislands;
-        stacksize = 1;
-
-        while (stacksize > 0) {
-          efa = stack[--stacksize];
-
-          BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
-            if (uv_selected && !uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
-              continue;
-            }
-
-            UvElement *element, *initelement = element_map->vert[BM_elem_index_get(l->v)];
-
-            for (element = initelement; element; element = element->next) {
-              if (element->separate) {
-                initelement = element;
-              }
-
-              if (element->l->f == efa) {
-                /* found the uv corresponding to our face and vertex.
-                 * Now fill it to the buffer */
-                element->island = nislands;
-                map[element - element_map->buf] = islandbufsize;
-                islandbuf[islandbufsize].l = element->l;
-                islandbuf[islandbufsize].separate = element->separate;
-                islandbuf[islandbufsize].loop_of_poly_index = element->loop_of_poly_index;
-                islandbuf[islandbufsize].island = nislands;
-                islandbufsize++;
-
-                for (element = initelement; element; element = element->next) {
-                  if (element->separate && element != initelement) {
-                    break;
-                  }
-
-                  if (island_number[BM_elem_index_get(element->l->f)] == INVALID_ISLAND) {
-                    stack[stacksize++] = element->l->f;
-                    island_number[BM_elem_index_get(element->l->f)] = nislands;
-                  }
-                }
-                break;
-              }
-            }
-          }
-        }
-
-        nislands++;
-      }
-    }
-
-    MEM_freeN(island_number);
-
-    /* remap */
-    for (i = 0; i < bm->totvert; i++) {
-      /* important since we may do selection only. Some of these may be NULL */
-      if (element_map->vert[i]) {
-        element_map->vert[i] = &islandbuf[map[element_map->vert[i] - element_map->buf]];
-      }
-    }
-
-    element_map->islandIndices = MEM_callocN(sizeof(*element_map->islandIndices) * nislands,
-                                             "UvElementMap_island_indices");
-    j = 0;
-    for (i = 0; i < totuv; i++) {
-      UvElement *element = element_map->buf[i].next;
-      if (element == NULL) {
-        islandbuf[map[i]].next = NULL;
-      }
-      else {
-        islandbuf[map[i]].next = &islandbuf[map[element - element_map->buf]];
-      }
+    bm_uv_build_islands(element_map, bm, scene, uv_selected);
+  }
 
-      if (islandbuf[i].island != j) {
-        j++;
-        element_map->islandIndices[j] = i;
-      }
+  /* TODO: Confirm element_map->total_unique_uvs doesn't require recalculating. */
+  element_map->total_unique_uvs = 0;
+  for (int i = 0; i < element_map->total_uvs; i++) {
+    if (element_map->storage[i].separate) {
+      element_map->total_unique_uvs++;
     }
-
-    MEM_freeN(element_map->buf);
-
-    element_map->buf = islandbuf;
-    element_map->totalIslands = nislands;
-    MEM_freeN(stack);
-    MEM_freeN(map);
   }
 
-  BLI_buffer_free(&tf_uv_buf);
-
   return element_map;
 }
 
@@ -883,30 +1160,38 @@ void BM_uv_vert_map_free(UvVertMap *vmap)
 void BM_uv_element_map_free(UvElementMap *element_map)
 {
   if (element_map) {
-    if (element_map->vert) {
-      MEM_freeN(element_map->vert);
-    }
-    if (element_map->buf) {
-      MEM_freeN(element_map->buf);
-    }
-    if (element_map->islandIndices) {
-      MEM_freeN(element_map->islandIndices);
-    }
-    MEM_freeN(element_map);
+    MEM_SAFE_FREE(element_map->storage);
+    MEM_SAFE_FREE(element_map->vertex);
+    MEM_SAFE_FREE(element_map->head_table);
+    MEM_SAFE_FREE(element_map->island_indices);
+    MEM_SAFE_FREE(element_map->island_total_uvs);
+    MEM_SAFE_FREE(element_map->island_total_unique_uvs);
+    MEM_SAFE_FREE(element_map);
   }
 }
 
-UvElement *BM_uv_element_get(UvElementMap *map, BMFace *efa, BMLoop *l)
+UvElement *BM_uv_element_get(const UvElementMap *element_map, const BMFace *efa, const BMLoop *l)
 {
-  for (UvElement *element = map->vert[BM_elem_index_get(l->v)]; element; element = element->next) {
+  UvElement *element = element_map->vertex[BM_elem_index_get(l->v)];
+  while (element) {
     if (element->l->f == efa) {
       return element;
     }
+    element = element->next;
   }
 
   return NULL;
 }
 
+UvElement *BM_uv_element_get_head(UvElementMap *element_map, UvElement *child)
+{
+  if (!child) {
+    return NULL;
+  }
+
+  return element_map->vertex[BM_elem_index_get(child->l->v)];
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -1376,7 +1661,7 @@ void EDBM_update(Mesh *mesh, const struct EDBMUpdate_Params *params)
   }
 
   if (params->is_destructive) {
-    /* TODO(campbell): we may be able to remove this now! */
+    /* TODO(@campbellbarton): we may be able to remove this now! */
     // BM_mesh_elem_table_free(em->bm, BM_ALL_NOLOOP);
   }
   else {
@@ -1488,15 +1773,13 @@ BMElem *EDBM_elem_from_index_any(BMEditMesh *em, uint index)
   return NULL;
 }
 
-int EDBM_elem_to_index_any_multi(ViewLayer *view_layer,
-                                 BMEditMesh *em,
-                                 BMElem *ele,
-                                 int *r_object_index)
+int EDBM_elem_to_index_any_multi(
+    const Scene *scene, ViewLayer *view_layer, BMEditMesh *em, BMElem *ele, int *r_object_index)
 {
   uint bases_len;
   int elem_index = -1;
   *r_object_index = -1;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(view_layer, NULL, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(scene, view_layer, NULL, &bases_len);
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     Base *base_iter = bases[base_index];
     if (BKE_editmesh_from_object(base_iter->object) == em) {
@@ -1509,13 +1792,14 @@ int EDBM_elem_to_index_any_multi(ViewLayer *view_layer,
   return elem_index;
 }
 
-BMElem *EDBM_elem_from_index_any_multi(ViewLayer *view_layer,
+BMElem *EDBM_elem_from_index_any_multi(const Scene *scene,
+                                       ViewLayer *view_layer,
                                        uint object_index,
                                        uint elem_index,
                                        Object **r_obedit)
 {
   uint bases_len;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(view_layer, NULL, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(scene, view_layer, NULL, &bases_len);
   *r_obedit = NULL;
   Object *obedit = (object_index < bases_len) ? bases[object_index]->object : NULL;
   MEM_freeN(bases);
diff --git a/source/blender/editors/mesh/mesh_data.cc b/source/blender/editors/mesh/mesh_data.cc
index 67834bf05ce..e362501d86c 100644
--- a/source/blender/editors/mesh/mesh_data.cc
+++ b/source/blender/editors/mesh/mesh_data.cc
@@ -18,6 +18,7 @@
 #include "BLI_utildefines.h"
 
 #include "BKE_attribute.h"
+#include "BKE_attribute.hh"
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_editmesh.h"
@@ -44,6 +45,8 @@
 #include "mesh_intern.h" /* own include */
 
 using blender::Array;
+using blender::MutableSpan;
+using blender::Span;
 
 static CustomData *mesh_customdata_get_type(Mesh *me, const char htype, int *r_tot)
 {
@@ -128,7 +131,6 @@ static void delete_customdata_layer(Mesh *me, CustomDataLayer *layer)
   }
   else {
     CustomData_free_layer(data, type, tot, layer_index + n);
-    BKE_mesh_update_customdata_pointers(me, true);
   }
 }
 
@@ -186,7 +188,7 @@ static void mesh_uv_reset_bmface(BMFace *f, const int cd_loop_uv_offset)
   mesh_uv_reset_array(fuv.data(), f->len);
 }
 
-static void mesh_uv_reset_mface(MPoly *mp, MLoopUV *mloopuv)
+static void mesh_uv_reset_mface(const MPoly *mp, MLoopUV *mloopuv)
 {
   Array<float *, BM_DEFAULT_NGON_STACK_SIZE> fuv(mp->totloop);
 
@@ -208,7 +210,7 @@ void ED_mesh_uv_loop_reset_ex(Mesh *me, const int layernum)
     BMFace *efa;
     BMIter iter;
 
-    BLI_assert(cd_loop_uv_offset != -1);
+    BLI_assert(cd_loop_uv_offset >= 0);
 
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
       if (!BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
@@ -223,8 +225,9 @@ void ED_mesh_uv_loop_reset_ex(Mesh *me, const int layernum)
     BLI_assert(CustomData_has_layer(&me->ldata, CD_MLOOPUV));
     MLoopUV *mloopuv = (MLoopUV *)CustomData_get_layer_n(&me->ldata, CD_MLOOPUV, layernum);
 
+    const MPoly *polys = BKE_mesh_polys(me);
     for (int i = 0; i < me->totpoly; i++) {
-      mesh_uv_reset_mface(&me->mpoly[i], mloopuv);
+      mesh_uv_reset_mface(&polys[i], mloopuv);
     }
   }
 
@@ -280,20 +283,23 @@ int ED_mesh_uv_add(
       return -1;
     }
 
-    if (me->mloopuv && do_init) {
-      CustomData_add_layer_named(
-          &me->ldata, CD_MLOOPUV, CD_DUPLICATE, me->mloopuv, me->totloop, name);
+    if (CustomData_has_layer(&me->ldata, CD_MLOOPUV) && do_init) {
+      CustomData_add_layer_named(&me->ldata,
+                                 CD_MLOOPUV,
+                                 CD_DUPLICATE,
+                                 CustomData_get_layer(&me->ldata, CD_MLOOPUV),
+                                 me->totloop,
+                                 name);
       is_init = true;
     }
     else {
-      CustomData_add_layer_named(&me->ldata, CD_MLOOPUV, CD_DEFAULT, nullptr, me->totloop, name);
+      CustomData_add_layer_named(
+          &me->ldata, CD_MLOOPUV, CD_SET_DEFAULT, nullptr, me->totloop, name);
     }
 
     if (active_set || layernum_dst == 0) {
       CustomData_set_layer_active(&me->ldata, CD_MLOOPUV, layernum_dst);
     }
-
-    BKE_mesh_update_customdata_pointers(me, true);
   }
 
   /* don't overwrite our copied coords */
@@ -368,8 +374,11 @@ bool ED_mesh_uv_remove_named(Mesh *me, const char *name)
   return false;
 }
 
-int ED_mesh_color_add(
-    Mesh *me, const char *name, const bool active_set, const bool do_init, ReportList *reports)
+int ED_mesh_color_add(Mesh *me,
+                      const char *name,
+                      const bool active_set,
+                      const bool do_init,
+                      ReportList *UNUSED(reports))
 {
   /* NOTE: keep in sync with #ED_mesh_uv_add. */
 
@@ -380,10 +389,6 @@ int ED_mesh_color_add(
     em = me->edit_mesh;
 
     layernum = CustomData_number_of_layers(&em->bm->ldata, CD_PROP_BYTE_COLOR);
-    if (layernum >= MAX_MCOL) {
-      BKE_reportf(reports, RPT_WARNING, "Cannot add more than %i vertex color layers", MAX_MCOL);
-      return -1;
-    }
 
     /* CD_PROP_BYTE_COLOR */
     BM_data_layer_add_named(em->bm, &em->bm->ldata, CD_PROP_BYTE_COLOR, name);
@@ -398,25 +403,25 @@ int ED_mesh_color_add(
   }
   else {
     layernum = CustomData_number_of_layers(&me->ldata, CD_PROP_BYTE_COLOR);
-    if (layernum >= MAX_MCOL) {
-      BKE_reportf(reports, RPT_WARNING, "Cannot add more than %i vertex color layers", MAX_MCOL);
-      return -1;
-    }
 
-    if (me->mloopcol && do_init) {
-      CustomData_add_layer_named(
-          &me->ldata, CD_PROP_BYTE_COLOR, CD_DUPLICATE, me->mloopcol, me->totloop, name);
+    if (CustomData_get_active_layer(&me->ldata, CD_PROP_BYTE_COLOR) != -1 && do_init) {
+      CustomData_add_layer_named(&me->ldata,
+                                 CD_PROP_BYTE_COLOR,
+                                 CD_DUPLICATE,
+                                 CustomData_get_layer(&me->ldata, CD_PROP_BYTE_COLOR),
+                                 me->totloop,
+                                 name);
     }
     else {
       CustomData_add_layer_named(
-          &me->ldata, CD_PROP_BYTE_COLOR, CD_DEFAULT, nullptr, me->totloop, name);
+          &me->ldata, CD_PROP_BYTE_COLOR, CD_SET_DEFAULT, nullptr, me->totloop, name);
     }
 
     if (active_set || layernum == 0) {
       CustomData_set_layer_active(&me->ldata, CD_PROP_BYTE_COLOR, layernum);
     }
 
-    BKE_mesh_update_customdata_pointers(me, true);
+    BKE_mesh_tessface_clear(me);
   }
 
   DEG_id_tag_update(&me->id, 0);
@@ -432,11 +437,11 @@ bool ED_mesh_color_ensure(Mesh *me, const char *name)
 
   if (!layer) {
     CustomData_add_layer_named(
-        &me->ldata, CD_PROP_BYTE_COLOR, CD_DEFAULT, nullptr, me->totloop, name);
+        &me->ldata, CD_PROP_BYTE_COLOR, CD_SET_DEFAULT, nullptr, me->totloop, name);
     layer = me->ldata.layers + CustomData_get_layer_index(&me->ldata, CD_PROP_BYTE_COLOR);
 
     BKE_id_attributes_active_color_set(&me->id, layer);
-    BKE_mesh_update_customdata_pointers(me, true);
+    BKE_mesh_tessface_clear(me);
   }
 
   DEG_id_tag_update(&me->id, 0);
@@ -444,44 +449,6 @@ bool ED_mesh_color_ensure(Mesh *me, const char *name)
   return (layer != nullptr);
 }
 
-bool ED_mesh_color_remove_index(Mesh *me, const int n)
-{
-  CustomData *ldata = GET_CD_DATA(me, ldata);
-  CustomDataLayer *cdl;
-  int index;
-
-  index = CustomData_get_layer_index_n(ldata, CD_PROP_BYTE_COLOR, n);
-  cdl = (index == -1) ? nullptr : &ldata->layers[index];
-
-  if (!cdl) {
-    return false;
-  }
-
-  delete_customdata_layer(me, cdl);
-  DEG_id_tag_update(&me->id, 0);
-  WM_main_add_notifier(NC_GEOM | ND_DATA, me);
-
-  return true;
-}
-bool ED_mesh_color_remove_active(Mesh *me)
-{
-  CustomData *ldata = GET_CD_DATA(me, ldata);
-  const int n = CustomData_get_active_layer(ldata, CD_PROP_BYTE_COLOR);
-  if (n != -1) {
-    return ED_mesh_color_remove_index(me, n);
-  }
-  return false;
-}
-bool ED_mesh_color_remove_named(Mesh *me, const char *name)
-{
-  CustomData *ldata = GET_CD_DATA(me, ldata);
-  const int n = CustomData_get_named_layer(ldata, CD_PROP_BYTE_COLOR, name);
-  if (n != -1) {
-    return ED_mesh_color_remove_index(me, n);
-  }
-  return false;
-}
-
 /*********************** General poll ************************/
 
 static bool layers_poll(bContext *C)
@@ -494,25 +461,10 @@ static bool layers_poll(bContext *C)
 
 /*********************** Sculpt Vertex colors operators ************************/
 
-static bool sculpt_vertex_color_remove_poll(bContext *C)
-{
-  if (!layers_poll(C)) {
-    return false;
-  }
-
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-  CustomData *vdata = GET_CD_DATA(me, vdata);
-  const int active = CustomData_get_active_layer(vdata, CD_PROP_COLOR);
-  if (active != -1) {
-    return true;
-  }
-
-  return false;
-}
-
-int ED_mesh_sculpt_color_add(
-    Mesh *me, const char *name, const bool active_set, const bool do_init, ReportList *reports)
+int ED_mesh_sculpt_color_add(Mesh *me,
+                             const char *name,
+                             const bool do_init,
+                             ReportList *UNUSED(reports))
 {
   /* NOTE: keep in sync with #ED_mesh_uv_add. */
 
@@ -523,11 +475,6 @@ int ED_mesh_sculpt_color_add(
     em = me->edit_mesh;
 
     layernum = CustomData_number_of_layers(&em->bm->vdata, CD_PROP_COLOR);
-    if (layernum >= MAX_MCOL) {
-      BKE_reportf(
-          reports, RPT_WARNING, "Cannot add more than %i sculpt vertex color layers", MAX_MCOL);
-      return -1;
-    }
 
     /* CD_PROP_COLOR */
     BM_data_layer_add_named(em->bm, &em->bm->vdata, CD_PROP_COLOR, name);
@@ -536,17 +483,12 @@ int ED_mesh_sculpt_color_add(
       const int layernum_dst = CustomData_get_active_layer(&em->bm->vdata, CD_PROP_COLOR);
       BM_data_layer_copy(em->bm, &em->bm->vdata, CD_PROP_COLOR, layernum_dst, layernum);
     }
-    if (active_set || layernum == 0) {
+    if (layernum == 0) {
       CustomData_set_layer_active(&em->bm->vdata, CD_PROP_COLOR, layernum);
     }
   }
   else {
     layernum = CustomData_number_of_layers(&me->vdata, CD_PROP_COLOR);
-    if (layernum >= MAX_MCOL) {
-      BKE_reportf(
-          reports, RPT_WARNING, "Cannot add more than %i sculpt vertex color layers", MAX_MCOL);
-      return -1;
-    }
 
     if (CustomData_has_layer(&me->vdata, CD_PROP_COLOR) && do_init) {
       const MPropCol *color_data = (const MPropCol *)CustomData_get_layer(&me->vdata,
@@ -556,14 +498,14 @@ int ED_mesh_sculpt_color_add(
     }
     else {
       CustomData_add_layer_named(
-          &me->vdata, CD_PROP_COLOR, CD_DEFAULT, nullptr, me->totvert, name);
+          &me->vdata, CD_PROP_COLOR, CD_SET_DEFAULT, nullptr, me->totvert, name);
     }
 
-    if (active_set || layernum == 0) {
+    if (layernum == 0) {
       CustomData_set_layer_active(&me->vdata, CD_PROP_COLOR, layernum);
     }
 
-    BKE_mesh_update_customdata_pointers(me, true);
+    BKE_mesh_tessface_clear(me);
   }
 
   DEG_id_tag_update(&me->id, 0);
@@ -572,58 +514,6 @@ int ED_mesh_sculpt_color_add(
   return layernum;
 }
 
-bool ED_mesh_sculpt_color_ensure(Mesh *me, const char *name)
-{
-  BLI_assert(me->edit_mesh == nullptr);
-
-  if (me->totvert && !CustomData_has_layer(&me->vdata, CD_PROP_COLOR)) {
-    CustomData_add_layer_named(&me->vdata, CD_PROP_COLOR, CD_DEFAULT, nullptr, me->totvert, name);
-    BKE_mesh_update_customdata_pointers(me, true);
-  }
-
-  DEG_id_tag_update(&me->id, 0);
-
-  return (me->mloopcol != nullptr);
-}
-
-bool ED_mesh_sculpt_color_remove_index(Mesh *me, const int n)
-{
-  CustomData *vdata = GET_CD_DATA(me, vdata);
-  CustomDataLayer *cdl;
-  int index;
-
-  index = CustomData_get_layer_index_n(vdata, CD_PROP_COLOR, n);
-  cdl = (index == -1) ? nullptr : &vdata->layers[index];
-
-  if (!cdl) {
-    return false;
-  }
-
-  delete_customdata_layer(me, cdl);
-  DEG_id_tag_update(&me->id, 0);
-  WM_main_add_notifier(NC_GEOM | ND_DATA, me);
-
-  return true;
-}
-bool ED_mesh_sculpt_color_remove_active(Mesh *me)
-{
-  CustomData *vdata = GET_CD_DATA(me, vdata);
-  const int n = CustomData_get_active_layer(vdata, CD_PROP_COLOR);
-  if (n != -1) {
-    return ED_mesh_sculpt_color_remove_index(me, n);
-  }
-  return false;
-}
-bool ED_mesh_sculpt_color_remove_named(Mesh *me, const char *name)
-{
-  CustomData *vdata = GET_CD_DATA(me, vdata);
-  const int n = CustomData_get_named_layer(vdata, CD_PROP_COLOR, name);
-  if (n != -1) {
-    return ED_mesh_sculpt_color_remove_index(me, n);
-  }
-  return false;
-}
-
 /*********************** UV texture operators ************************/
 
 static bool uv_texture_remove_poll(bContext *C)
@@ -709,135 +599,6 @@ void MESH_OT_uv_texture_remove(wmOperatorType *ot)
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
-/*********************** vertex color operators ************************/
-
-static bool vertex_color_remove_poll(bContext *C)
-{
-  if (!layers_poll(C)) {
-    return false;
-  }
-
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-  CustomData *ldata = GET_CD_DATA(me, ldata);
-  const int active = CustomData_get_active_layer(ldata, CD_PROP_BYTE_COLOR);
-  if (active != -1) {
-    return true;
-  }
-
-  return false;
-}
-
-static int mesh_vertex_color_add_exec(bContext *C, wmOperator *op)
-{
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-
-  if (ED_mesh_color_add(me, nullptr, true, true, op->reports) == -1) {
-    return OPERATOR_CANCELLED;
-  }
-
-  return OPERATOR_FINISHED;
-}
-
-void MESH_OT_vertex_color_add(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Add Vertex Color";
-  ot->description = "Add vertex color layer";
-  ot->idname = "MESH_OT_vertex_color_add";
-
-  /* api callbacks */
-  ot->poll = layers_poll;
-  ot->exec = mesh_vertex_color_add_exec;
-
-  /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
-}
-
-static int mesh_vertex_color_remove_exec(bContext *C, wmOperator *UNUSED(op))
-{
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-
-  if (!ED_mesh_color_remove_active(me)) {
-    return OPERATOR_CANCELLED;
-  }
-
-  return OPERATOR_FINISHED;
-}
-
-void MESH_OT_vertex_color_remove(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Remove Vertex Color";
-  ot->description = "Remove vertex color layer";
-  ot->idname = "MESH_OT_vertex_color_remove";
-
-  /* api callbacks */
-  ot->exec = mesh_vertex_color_remove_exec;
-  ot->poll = vertex_color_remove_poll;
-
-  /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
-}
-
-/*********************** Sculpt Vertex Color Operators ************************/
-
-static int mesh_sculpt_vertex_color_add_exec(bContext *C, wmOperator *op)
-{
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-
-  if (ED_mesh_sculpt_color_add(me, nullptr, true, true, op->reports) == -1) {
-    return OPERATOR_CANCELLED;
-  }
-
-  return OPERATOR_FINISHED;
-}
-
-void MESH_OT_sculpt_vertex_color_add(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Add Sculpt Vertex Color";
-  ot->description = "Add vertex color layer";
-  ot->idname = "MESH_OT_sculpt_vertex_color_add";
-
-  /* api callbacks */
-  ot->poll = layers_poll;
-  ot->exec = mesh_sculpt_vertex_color_add_exec;
-
-  /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
-}
-
-static int mesh_sculpt_vertex_color_remove_exec(bContext *C, wmOperator *UNUSED(op))
-{
-  Object *ob = ED_object_context(C);
-  Mesh *me = static_cast<Mesh *>(ob->data);
-
-  if (!ED_mesh_sculpt_color_remove_active(me)) {
-    return OPERATOR_CANCELLED;
-  }
-
-  return OPERATOR_FINISHED;
-}
-
-void MESH_OT_sculpt_vertex_color_remove(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Remove Sculpt Vertex Color";
-  ot->description = "Remove vertex color layer";
-  ot->idname = "MESH_OT_sculpt_vertex_color_remove";
-
-  /* api callbacks */
-  ot->exec = mesh_sculpt_vertex_color_remove_exec;
-  ot->poll = sculpt_vertex_color_remove_poll;
-
-  /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
-}
-
 /* *** CustomData clear functions, we need an operator for each *** */
 
 static int mesh_customdata_clear_exec__internal(bContext *C, char htype, int type)
@@ -865,6 +626,28 @@ static int mesh_customdata_clear_exec__internal(bContext *C, char htype, int typ
   return OPERATOR_CANCELLED;
 }
 
+static int mesh_customdata_add_exec__internal(bContext *C, char htype, int type)
+{
+  Mesh *mesh = ED_mesh_context(C);
+
+  int tot;
+  CustomData *data = mesh_customdata_get_type(mesh, htype, &tot);
+
+  BLI_assert(CustomData_layertype_is_singleton(type) == true);
+
+  if (mesh->edit_mesh) {
+    BM_data_layer_add(mesh->edit_mesh->bm, data, type);
+  }
+  else {
+    CustomData_add_layer(data, type, CD_SET_DEFAULT, NULL, tot);
+  }
+
+  DEG_id_tag_update(&mesh->id, 0);
+  WM_event_add_notifier(C, NC_GEOM | ND_DATA, mesh);
+
+  return CustomData_has_layer(data, type) ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
+}
+
 /* Clear Mask */
 static bool mesh_customdata_mask_clear_poll(bContext *C)
 {
@@ -1015,19 +798,24 @@ static int mesh_customdata_custom_splitnormals_add_exec(bContext *C, wmOperator
       /* Tag edges as sharp according to smooth threshold if needed,
        * to preserve autosmooth shading. */
       if (me->flag & ME_AUTOSMOOTH) {
-        BKE_edges_sharp_from_angle_set(me->mvert,
-                                       me->totvert,
-                                       me->medge,
-                                       me->totedge,
-                                       me->mloop,
-                                       me->totloop,
-                                       me->mpoly,
+        const Span<MVert> verts = me->verts();
+        MutableSpan<MEdge> edges = me->edges_for_write();
+        const Span<MPoly> polys = me->polys();
+        const Span<MLoop> loops = me->loops();
+
+        BKE_edges_sharp_from_angle_set(verts.data(),
+                                       verts.size(),
+                                       edges.data(),
+                                       edges.size(),
+                                       loops.data(),
+                                       loops.size(),
+                                       polys.data(),
                                        BKE_mesh_poly_normals_ensure(me),
-                                       me->totpoly,
+                                       polys.size(),
                                        me->smoothresh);
       }
 
-      CustomData_add_layer(data, CD_CUSTOMLOOPNORMAL, CD_DEFAULT, nullptr, me->totloop);
+      CustomData_add_layer(data, CD_CUSTOMLOOPNORMAL, CD_SET_DEFAULT, nullptr, me->totloop);
     }
 
     DEG_id_tag_update(&me->id, 0);
@@ -1082,6 +870,126 @@ void MESH_OT_customdata_custom_splitnormals_clear(wmOperatorType *ot)
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
 
+/* Vertex bevel weight. */
+
+static int mesh_customdata_bevel_weight_vertex_state(bContext *C)
+{
+  const Object *object = ED_object_context(C);
+
+  if (object && object->type == OB_MESH) {
+    const Mesh *mesh = static_cast<Mesh *>(object->data);
+    if (!ID_IS_LINKED(mesh)) {
+      const CustomData *data = GET_CD_DATA(mesh, vdata);
+      return CustomData_has_layer(data, CD_BWEIGHT);
+    }
+  }
+  return -1;
+}
+
+static bool mesh_customdata_bevel_weight_vertex_add_poll(bContext *C)
+{
+  return mesh_customdata_bevel_weight_vertex_state(C) == 0;
+}
+
+static int mesh_customdata_bevel_weight_vertex_add_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  return mesh_customdata_add_exec__internal(C, BM_VERT, CD_BWEIGHT);
+}
+
+void MESH_OT_customdata_bevel_weight_vertex_add(wmOperatorType *ot)
+{
+  ot->name = "Add Vertex Bevel Weight";
+  ot->idname = "MESH_OT_customdata_bevel_weight_vertex_add";
+  ot->description = "Add a vertex bevel weight layer";
+
+  ot->exec = mesh_customdata_bevel_weight_vertex_add_exec;
+  ot->poll = mesh_customdata_bevel_weight_vertex_add_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+static bool mesh_customdata_bevel_weight_vertex_clear_poll(bContext *C)
+{
+  return (mesh_customdata_bevel_weight_vertex_state(C) == 1);
+}
+
+static int mesh_customdata_bevel_weight_vertex_clear_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  return mesh_customdata_clear_exec__internal(C, BM_VERT, CD_BWEIGHT);
+}
+
+void MESH_OT_customdata_bevel_weight_vertex_clear(wmOperatorType *ot)
+{
+  ot->name = "Clear Vertex Bevel Weight";
+  ot->idname = "MESH_OT_customdata_bevel_weight_vertex_clear";
+  ot->description = "Clear the vertex bevel weight layer";
+
+  ot->exec = mesh_customdata_bevel_weight_vertex_clear_exec;
+  ot->poll = mesh_customdata_bevel_weight_vertex_clear_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/* Edge bevel weight. */
+
+static int mesh_customdata_bevel_weight_edge_state(bContext *C)
+{
+  const Object *ob = ED_object_context(C);
+
+  if (ob && ob->type == OB_MESH) {
+    const Mesh *mesh = static_cast<Mesh *>(ob->data);
+    if (!ID_IS_LINKED(mesh)) {
+      const CustomData *data = GET_CD_DATA(mesh, edata);
+      return CustomData_has_layer(data, CD_BWEIGHT);
+    }
+  }
+  return -1;
+}
+
+static bool mesh_customdata_bevel_weight_edge_add_poll(bContext *C)
+{
+  return mesh_customdata_bevel_weight_edge_state(C) == 0;
+}
+
+static int mesh_customdata_bevel_weight_edge_add_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  return mesh_customdata_add_exec__internal(C, BM_EDGE, CD_BWEIGHT);
+}
+
+void MESH_OT_customdata_bevel_weight_edge_add(wmOperatorType *ot)
+{
+  ot->name = "Add Edge Bevel Weight";
+  ot->idname = "MESH_OT_customdata_bevel_weight_edge_add";
+  ot->description = "Add an edge bevel weight layer";
+
+  ot->exec = mesh_customdata_bevel_weight_edge_add_exec;
+  ot->poll = mesh_customdata_bevel_weight_edge_add_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+static bool mesh_customdata_bevel_weight_edge_clear_poll(bContext *C)
+{
+  return mesh_customdata_bevel_weight_edge_state(C) == 1;
+}
+
+static int mesh_customdata_bevel_weight_edge_clear_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  return mesh_customdata_clear_exec__internal(C, BM_EDGE, CD_BWEIGHT);
+}
+
+void MESH_OT_customdata_bevel_weight_edge_clear(wmOperatorType *ot)
+{
+  ot->name = "Clear Edge Bevel Weight";
+  ot->idname = "MESH_OT_customdata_bevel_weight_edge_clear";
+  ot->description = "Clear the edge bevel weight layer";
+
+  ot->exec = mesh_customdata_bevel_weight_edge_clear_exec;
+  ot->poll = mesh_customdata_bevel_weight_edge_clear_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
 /************************** Add Geometry Layers *************************/
 
 void ED_mesh_update(Mesh *mesh, bContext *C, bool calc_edges, bool calc_edges_loose)
@@ -1112,36 +1020,31 @@ static void mesh_add_verts(Mesh *mesh, int len)
 
   int totvert = mesh->totvert + len;
   CustomData vdata;
-  CustomData_copy(&mesh->vdata, &vdata, CD_MASK_MESH.vmask, CD_DEFAULT, totvert);
+  CustomData_copy(&mesh->vdata, &vdata, CD_MASK_MESH.vmask, CD_SET_DEFAULT, totvert);
   CustomData_copy_data(&mesh->vdata, &vdata, 0, 0, mesh->totvert);
 
   if (!CustomData_has_layer(&vdata, CD_MVERT)) {
-    CustomData_add_layer(&vdata, CD_MVERT, CD_CALLOC, nullptr, totvert);
+    CustomData_add_layer(&vdata, CD_MVERT, CD_SET_DEFAULT, nullptr, totvert);
   }
 
   CustomData_free(&mesh->vdata, mesh->totvert);
   mesh->vdata = vdata;
-  BKE_mesh_update_customdata_pointers(mesh, false);
 
   BKE_mesh_runtime_clear_cache(mesh);
 
-  /* scan the input list and insert the new vertices */
+  const int old_vertex_num = mesh->totvert;
+  mesh->totvert = totvert;
 
-  /* set default flags */
-  MVert *mvert = &mesh->mvert[mesh->totvert];
-  for (int i = 0; i < len; i++, mvert++) {
-    mvert->flag |= SELECT;
+  MutableSpan<MVert> verts = mesh->verts_for_write();
+  for (MVert &vert : verts.drop_front(old_vertex_num)) {
+    vert.flag = SELECT;
   }
-
-  /* set final vertex list size */
-  mesh->totvert = totvert;
 }
 
 static void mesh_add_edges(Mesh *mesh, int len)
 {
   CustomData edata;
-  MEdge *medge;
-  int i, totedge;
+  int totedge;
 
   if (len == 0) {
     return;
@@ -1150,26 +1053,25 @@ static void mesh_add_edges(Mesh *mesh, int len)
   totedge = mesh->totedge + len;
 
   /* Update custom-data. */
-  CustomData_copy(&mesh->edata, &edata, CD_MASK_MESH.emask, CD_DEFAULT, totedge);
+  CustomData_copy(&mesh->edata, &edata, CD_MASK_MESH.emask, CD_SET_DEFAULT, totedge);
   CustomData_copy_data(&mesh->edata, &edata, 0, 0, mesh->totedge);
 
   if (!CustomData_has_layer(&edata, CD_MEDGE)) {
-    CustomData_add_layer(&edata, CD_MEDGE, CD_CALLOC, nullptr, totedge);
+    CustomData_add_layer(&edata, CD_MEDGE, CD_SET_DEFAULT, nullptr, totedge);
   }
 
   CustomData_free(&mesh->edata, mesh->totedge);
   mesh->edata = edata;
-  BKE_mesh_update_customdata_pointers(mesh, false); /* new edges don't change tessellation */
 
   BKE_mesh_runtime_clear_cache(mesh);
 
-  /* set default flags */
-  medge = &mesh->medge[mesh->totedge];
-  for (i = 0; i < len; i++, medge++) {
-    medge->flag = ME_EDGEDRAW | ME_EDGERENDER | SELECT;
-  }
-
+  const int old_edges_num = mesh->totedge;
   mesh->totedge = totedge;
+
+  MutableSpan<MEdge> edges = mesh->edges_for_write();
+  for (MEdge &edge : edges.drop_front(old_edges_num)) {
+    edge.flag = ME_EDGEDRAW | ME_EDGERENDER | SELECT;
+  }
 }
 
 static void mesh_add_loops(Mesh *mesh, int len)
@@ -1184,18 +1086,17 @@ static void mesh_add_loops(Mesh *mesh, int len)
   totloop = mesh->totloop + len; /* new face count */
 
   /* update customdata */
-  CustomData_copy(&mesh->ldata, &ldata, CD_MASK_MESH.lmask, CD_DEFAULT, totloop);
+  CustomData_copy(&mesh->ldata, &ldata, CD_MASK_MESH.lmask, CD_SET_DEFAULT, totloop);
   CustomData_copy_data(&mesh->ldata, &ldata, 0, 0, mesh->totloop);
 
   if (!CustomData_has_layer(&ldata, CD_MLOOP)) {
-    CustomData_add_layer(&ldata, CD_MLOOP, CD_CALLOC, nullptr, totloop);
+    CustomData_add_layer(&ldata, CD_MLOOP, CD_SET_DEFAULT, nullptr, totloop);
   }
 
   BKE_mesh_runtime_clear_cache(mesh);
 
   CustomData_free(&mesh->ldata, mesh->totloop);
   mesh->ldata = ldata;
-  BKE_mesh_update_customdata_pointers(mesh, true);
 
   mesh->totloop = totloop;
 }
@@ -1203,8 +1104,7 @@ static void mesh_add_loops(Mesh *mesh, int len)
 static void mesh_add_polys(Mesh *mesh, int len)
 {
   CustomData pdata;
-  MPoly *mpoly;
-  int i, totpoly;
+  int totpoly;
 
   if (len == 0) {
     return;
@@ -1213,26 +1113,25 @@ static void mesh_add_polys(Mesh *mesh, int len)
   totpoly = mesh->totpoly + len; /* new face count */
 
   /* update customdata */
-  CustomData_copy(&mesh->pdata, &pdata, CD_MASK_MESH.pmask, CD_DEFAULT, totpoly);
+  CustomData_copy(&mesh->pdata, &pdata, CD_MASK_MESH.pmask, CD_SET_DEFAULT, totpoly);
   CustomData_copy_data(&mesh->pdata, &pdata, 0, 0, mesh->totpoly);
 
   if (!CustomData_has_layer(&pdata, CD_MPOLY)) {
-    CustomData_add_layer(&pdata, CD_MPOLY, CD_CALLOC, nullptr, totpoly);
+    CustomData_add_layer(&pdata, CD_MPOLY, CD_SET_DEFAULT, nullptr, totpoly);
   }
 
   CustomData_free(&mesh->pdata, mesh->totpoly);
   mesh->pdata = pdata;
-  BKE_mesh_update_customdata_pointers(mesh, true);
 
   BKE_mesh_runtime_clear_cache(mesh);
 
-  /* set default flags */
-  mpoly = &mesh->mpoly[mesh->totpoly];
-  for (i = 0; i < len; i++, mpoly++) {
-    mpoly->flag = ME_FACE_SEL;
-  }
-
+  const int old_polys_num = mesh->totpoly;
   mesh->totpoly = totpoly;
+
+  MutableSpan<MPoly> polys = mesh->polys_for_write();
+  for (MPoly &poly : polys.drop_front(old_polys_num)) {
+    poly.flag = ME_FACE_SEL;
+  }
 }
 
 /* -------------------------------------------------------------------- */
diff --git a/source/blender/editors/mesh/mesh_intern.h b/source/blender/editors/mesh/mesh_intern.h
index 303234df48c..75f63ed5d6f 100644
--- a/source/blender/editors/mesh/mesh_intern.h
+++ b/source/blender/editors/mesh/mesh_intern.h
@@ -84,11 +84,13 @@ struct BMElem *EDBM_elem_from_selectmode(struct BMEditMesh *em,
 int EDBM_elem_to_index_any(struct BMEditMesh *em, struct BMElem *ele);
 struct BMElem *EDBM_elem_from_index_any(struct BMEditMesh *em, uint index);
 
-int EDBM_elem_to_index_any_multi(struct ViewLayer *view_layer,
+int EDBM_elem_to_index_any_multi(const struct Scene *scene,
+                                 struct ViewLayer *view_layer,
                                  struct BMEditMesh *em,
                                  struct BMElem *ele,
                                  int *r_object_index);
-struct BMElem *EDBM_elem_from_index_any_multi(struct ViewLayer *view_layer,
+struct BMElem *EDBM_elem_from_index_any_multi(const struct Scene *scene,
+                                              struct ViewLayer *view_layer,
                                               uint object_index,
                                               uint elem_index,
                                               struct Object **r_obedit);
@@ -308,15 +310,15 @@ void MESH_OT_mark_freestyle_face(struct wmOperatorType *ot);
 
 void MESH_OT_uv_texture_add(struct wmOperatorType *ot);
 void MESH_OT_uv_texture_remove(struct wmOperatorType *ot);
-void MESH_OT_vertex_color_add(struct wmOperatorType *ot);
-void MESH_OT_vertex_color_remove(struct wmOperatorType *ot);
-void MESH_OT_sculpt_vertex_color_add(struct wmOperatorType *ot);
-void MESH_OT_sculpt_vertex_color_remove(struct wmOperatorType *ot);
 void MESH_OT_customdata_mask_clear(struct wmOperatorType *ot);
 void MESH_OT_customdata_skin_add(struct wmOperatorType *ot);
 void MESH_OT_customdata_skin_clear(struct wmOperatorType *ot);
 void MESH_OT_customdata_custom_splitnormals_add(struct wmOperatorType *ot);
 void MESH_OT_customdata_custom_splitnormals_clear(struct wmOperatorType *ot);
+void MESH_OT_customdata_bevel_weight_vertex_add(struct wmOperatorType *ot);
+void MESH_OT_customdata_bevel_weight_vertex_clear(struct wmOperatorType *ot);
+void MESH_OT_customdata_bevel_weight_edge_add(struct wmOperatorType *ot);
+void MESH_OT_customdata_bevel_weight_edge_clear(struct wmOperatorType *ot);
 
 #ifdef __cplusplus
 }
diff --git a/source/blender/editors/mesh/mesh_mirror.c b/source/blender/editors/mesh/mesh_mirror.c
index 82e77a88a57..ad5a5d362f1 100644
--- a/source/blender/editors/mesh/mesh_mirror.c
+++ b/source/blender/editors/mesh/mesh_mirror.c
@@ -55,11 +55,9 @@ void ED_mesh_mirror_spatial_table_begin(Object *ob, BMEditMesh *em, Mesh *me_eva
     }
   }
   else {
-    MVert *mvert = me_eval ? me_eval->mvert : me->mvert;
-    int i;
-
-    for (i = 0; i < totvert; i++, mvert++) {
-      BLI_kdtree_3d_insert(MirrKdStore.tree, i, mvert->co);
+    const MVert *verts = BKE_mesh_verts(me_eval ? me_eval : me);
+    for (int i = 0; i < totvert; i++) {
+      BLI_kdtree_3d_insert(MirrKdStore.tree, i, verts[i].co);
     }
   }
 
@@ -164,7 +162,7 @@ void ED_mesh_mirrtopo_init(BMEditMesh *em,
     BLI_assert(me == NULL);
   }
   const bool is_editmode = (em != NULL);
-  MEdge *medge = NULL, *med;
+  const MEdge *medge = NULL, *med;
 
   /* Edit-mode variables. */
   BMEdge *eed;
@@ -210,8 +208,7 @@ void ED_mesh_mirrtopo_init(BMEditMesh *em,
   }
   else {
     totedge = me->totedge;
-    medge = me->medge;
-
+    medge = BKE_mesh_edges(me);
     for (a = 0, med = medge; a < totedge; a++, med++) {
       const uint i1 = med->v1, i2 = med->v2;
       topo_hash[i1]++;
diff --git a/source/blender/editors/mesh/mesh_ops.c b/source/blender/editors/mesh/mesh_ops.c
index be7f60b0da0..01c92a59fc9 100644
--- a/source/blender/editors/mesh/mesh_ops.c
+++ b/source/blender/editors/mesh/mesh_ops.c
@@ -134,15 +134,15 @@ void ED_operatortypes_mesh(void)
 
   WM_operatortype_append(MESH_OT_uv_texture_add);
   WM_operatortype_append(MESH_OT_uv_texture_remove);
-  WM_operatortype_append(MESH_OT_vertex_color_add);
-  WM_operatortype_append(MESH_OT_vertex_color_remove);
-  WM_operatortype_append(MESH_OT_sculpt_vertex_color_add);
-  WM_operatortype_append(MESH_OT_sculpt_vertex_color_remove);
   WM_operatortype_append(MESH_OT_customdata_mask_clear);
   WM_operatortype_append(MESH_OT_customdata_skin_add);
   WM_operatortype_append(MESH_OT_customdata_skin_clear);
   WM_operatortype_append(MESH_OT_customdata_custom_splitnormals_add);
   WM_operatortype_append(MESH_OT_customdata_custom_splitnormals_clear);
+  WM_operatortype_append(MESH_OT_customdata_bevel_weight_vertex_add);
+  WM_operatortype_append(MESH_OT_customdata_bevel_weight_vertex_clear);
+  WM_operatortype_append(MESH_OT_customdata_bevel_weight_edge_add);
+  WM_operatortype_append(MESH_OT_customdata_bevel_weight_edge_clear);
 
   WM_operatortype_append(MESH_OT_edgering_select);
   WM_operatortype_append(MESH_OT_loopcut);
diff --git a/source/blender/editors/mesh/meshtools.cc b/source/blender/editors/mesh/meshtools.cc
index 9e28e1bafdd..831ab858b1c 100644
--- a/source/blender/editors/mesh/meshtools.cc
+++ b/source/blender/editors/mesh/meshtools.cc
@@ -10,6 +10,8 @@
 
 #include "MEM_guardedalloc.h"
 
+#include "BLI_virtual_array.hh"
+
 #include "DNA_key_types.h"
 #include "DNA_material_types.h"
 #include "DNA_mesh_types.h"
@@ -21,6 +23,7 @@
 #include "DNA_view3d_types.h"
 #include "DNA_workspace_types.h"
 
+#include "BKE_attribute.hh"
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_deform.h"
@@ -52,6 +55,9 @@
 #include "WM_api.h"
 #include "WM_types.h"
 
+using blender::MutableSpan;
+using blender::Span;
+
 /* * ********************** no editmode!!! *********** */
 
 /*********************** JOIN ***************************/
@@ -100,7 +106,7 @@ static void join_mesh_single(Depsgraph *depsgraph,
     ((Mesh *)ob_dst->data)->cd_flag |= me->cd_flag;
 
     /* standard data */
-    CustomData_merge(&me->vdata, vdata, CD_MASK_MESH.vmask, CD_DEFAULT, totvert);
+    CustomData_merge(&me->vdata, vdata, CD_MASK_MESH.vmask, CD_SET_DEFAULT, totvert);
     CustomData_copy_data_named(&me->vdata, vdata, 0, *vertofs, me->totvert);
 
     /* vertex groups */
@@ -199,7 +205,7 @@ static void join_mesh_single(Depsgraph *depsgraph,
   }
 
   if (me->totedge) {
-    CustomData_merge(&me->edata, edata, CD_MASK_MESH.emask, CD_DEFAULT, totedge);
+    CustomData_merge(&me->edata, edata, CD_MASK_MESH.emask, CD_SET_DEFAULT, totedge);
     CustomData_copy_data_named(&me->edata, edata, 0, *edgeofs, me->totedge);
 
     for (a = 0; a < me->totedge; a++, medge++) {
@@ -220,7 +226,7 @@ static void join_mesh_single(Depsgraph *depsgraph,
       }
     }
 
-    CustomData_merge(&me->ldata, ldata, CD_MASK_MESH.lmask, CD_DEFAULT, totloop);
+    CustomData_merge(&me->ldata, ldata, CD_MASK_MESH.lmask, CD_SET_DEFAULT, totloop);
     CustomData_copy_data_named(&me->ldata, ldata, 0, *loopofs, me->totloop);
 
     for (a = 0; a < me->totloop; a++, mloop++) {
@@ -244,12 +250,25 @@ static void join_mesh_single(Depsgraph *depsgraph,
       }
     }
 
-    CustomData_merge(&me->pdata, pdata, CD_MASK_MESH.pmask, CD_DEFAULT, totpoly);
+    CustomData_merge(&me->pdata, pdata, CD_MASK_MESH.pmask, CD_SET_DEFAULT, totpoly);
     CustomData_copy_data_named(&me->pdata, pdata, 0, *polyofs, me->totpoly);
 
+    /* Apply matmap. In case we don't have material indices yet, create them if more than one
+     * material is the result of joining. */
+    int *material_indices = static_cast<int *>(
+        CustomData_get_layer_named(pdata, CD_PROP_INT32, "material_index"));
+    if (!material_indices && totcol > 1) {
+      material_indices = (int *)CustomData_add_layer_named(
+          pdata, CD_PROP_INT32, CD_SET_DEFAULT, NULL, totpoly, "material_index");
+    }
+    if (material_indices) {
+      for (a = 0; a < me->totpoly; a++) {
+        material_indices[a + *polyofs] = matmap ? matmap[material_indices[a + *polyofs]] : 0;
+      }
+    }
+
     for (a = 0; a < me->totpoly; a++, mpoly++) {
       mpoly->loopstart += *loopofs;
-      mpoly->mat_nr = matmap ? matmap[mpoly->mat_nr] : 0;
     }
 
     /* Face maps. */
@@ -298,15 +317,10 @@ static void mesh_join_offset_face_sets_ID(const Mesh *mesh, int *face_set_offset
   for (int f = 0; f < mesh->totpoly; f++) {
     /* As face sets encode the visibility in the integer sign, the offset needs to be added or
      * subtracted depending on the initial sign of the integer to get the new ID. */
-    if (abs(face_sets[f]) <= *face_set_offset) {
-      if (face_sets[f] > 0) {
-        face_sets[f] += *face_set_offset;
-      }
-      else {
-        face_sets[f] -= *face_set_offset;
-      }
+    if (face_sets[f] <= *face_set_offset) {
+      face_sets[f] += *face_set_offset;
     }
-    max_face_set = max_ii(max_face_set, abs(face_sets[f]));
+    max_face_set = max_ii(max_face_set, face_sets[f]);
   }
   *face_set_offset = max_face_set;
 }
@@ -328,7 +342,7 @@ int ED_mesh_join_objects_exec(bContext *C, wmOperator *op)
   int totloop = 0, totpoly = 0, vertofs, *matmap = nullptr;
   int i, haskey = 0, edgeofs, loopofs, polyofs;
   bool ok = false, join_parent = false;
-  CustomData vdata, edata, fdata, ldata, pdata;
+  CustomData vdata, edata, ldata, pdata;
 
   if (ob->mode & OB_MODE_EDIT) {
     BKE_report(op->reports, RPT_WARNING, "Cannot join while in edit mode");
@@ -567,14 +581,13 @@ int ED_mesh_join_objects_exec(bContext *C, wmOperator *op)
   /* setup new data for destination mesh */
   CustomData_reset(&vdata);
   CustomData_reset(&edata);
-  CustomData_reset(&fdata);
   CustomData_reset(&ldata);
   CustomData_reset(&pdata);
 
-  mvert = (MVert *)CustomData_add_layer(&vdata, CD_MVERT, CD_CALLOC, nullptr, totvert);
-  medge = (MEdge *)CustomData_add_layer(&edata, CD_MEDGE, CD_CALLOC, nullptr, totedge);
-  mloop = (MLoop *)CustomData_add_layer(&ldata, CD_MLOOP, CD_CALLOC, nullptr, totloop);
-  mpoly = (MPoly *)CustomData_add_layer(&pdata, CD_MPOLY, CD_CALLOC, nullptr, totpoly);
+  mvert = (MVert *)CustomData_add_layer(&vdata, CD_MVERT, CD_SET_DEFAULT, nullptr, totvert);
+  medge = (MEdge *)CustomData_add_layer(&edata, CD_MEDGE, CD_SET_DEFAULT, nullptr, totedge);
+  mloop = (MLoop *)CustomData_add_layer(&ldata, CD_MLOOP, CD_SET_DEFAULT, nullptr, totloop);
+  mpoly = (MPoly *)CustomData_add_layer(&pdata, CD_MPOLY, CD_SET_DEFAULT, nullptr, totpoly);
 
   vertofs = 0;
   edgeofs = 0;
@@ -678,9 +691,6 @@ int ED_mesh_join_objects_exec(bContext *C, wmOperator *op)
   me->ldata = ldata;
   me->pdata = pdata;
 
-  /* tessface data removed above, no need to update */
-  BKE_mesh_update_customdata_pointers(me, false);
-
   /* Tag normals dirty because vertex positions could be changed from the original. */
   BKE_mesh_normals_tag_dirty(me);
 
@@ -893,13 +903,13 @@ static bool ed_mesh_mirror_topo_table_update(Object *ob, Mesh *me_eval)
 static int mesh_get_x_mirror_vert_spatial(Object *ob, Mesh *me_eval, int index)
 {
   Mesh *me = static_cast<Mesh *>(ob->data);
-  MVert *mvert = me_eval ? me_eval->mvert : me->mvert;
+  const Span<MVert> verts = me_eval ? me_eval->verts() : me->verts();
+
   float vec[3];
 
-  mvert = &mvert[index];
-  vec[0] = -mvert->co[0];
-  vec[1] = mvert->co[1];
-  vec[2] = mvert->co[2];
+  vec[0] = -verts[index].co[0];
+  vec[1] = verts[index].co[1];
+  vec[2] = verts[index].co[2];
 
   return ED_mesh_mirror_spatial_table_lookup(ob, nullptr, me_eval, vec);
 }
@@ -1115,8 +1125,8 @@ static bool mirror_facecmp(const void *a, const void *b)
 int *mesh_get_x_mirror_faces(Object *ob, BMEditMesh *em, Mesh *me_eval)
 {
   Mesh *me = static_cast<Mesh *>(ob->data);
-  MVert *mv, *mvert;
-  MFace mirrormf, *mf, *hashmf, *mface;
+  const MVert *mv;
+  MFace mirrormf, *mf, *hashmf;
   GHash *fhash;
   int *mirrorverts, *mirrorfaces;
 
@@ -1130,12 +1140,12 @@ int *mesh_get_x_mirror_faces(Object *ob, BMEditMesh *em, Mesh *me_eval)
   mirrorverts = static_cast<int *>(MEM_callocN(sizeof(int) * totvert, "MirrorVerts"));
   mirrorfaces = static_cast<int *>(MEM_callocN(sizeof(int[2]) * totface, "MirrorFaces"));
 
-  mvert = me_eval ? me_eval->mvert : me->mvert;
-  mface = me_eval ? me_eval->mface : me->mface;
+  const Span<MVert> verts = me_eval ? me_eval->verts() : me->verts();
+  MFace *mface = (MFace *)CustomData_get_layer(&(me_eval ? me_eval : me)->fdata, CD_MFACE);
 
   ED_mesh_mirror_spatial_table_begin(ob, em, me_eval);
 
-  for (a = 0, mv = mvert; a < totvert; a++, mv++) {
+  for (a = 0, mv = verts.data(); a < totvert; a++, mv++) {
     mirrorverts[a] = mesh_get_x_mirror_vert(ob, me_eval, a, use_topology);
   }
 
@@ -1262,42 +1272,28 @@ bool ED_mesh_pick_face_vert(
     const float mval_f[2] = {(float)mval[0], (float)mval[1]};
     float len_best = FLT_MAX;
 
-    MPoly *me_eval_mpoly;
-    MLoop *me_eval_mloop;
-    MVert *me_eval_mvert;
-    uint me_eval_mpoly_len;
-
-    me_eval_mpoly = me_eval->mpoly;
-    me_eval_mloop = me_eval->mloop;
-    me_eval_mvert = me_eval->mvert;
-
-    me_eval_mpoly_len = me_eval->totpoly;
+    const Span<MVert> verts = me_eval->verts();
+    const Span<MPoly> polys = me_eval->polys();
+    const Span<MLoop> loops = me_eval->loops();
 
     const int *index_mp_to_orig = (const int *)CustomData_get_layer(&me_eval->pdata, CD_ORIGINDEX);
 
     /* tag all verts using this face */
     if (index_mp_to_orig) {
-      uint i;
-
-      for (i = 0; i < me_eval_mpoly_len; i++) {
+      for (const int i : polys.index_range()) {
         if (index_mp_to_orig[i] == poly_index) {
-          ed_mesh_pick_face_vert__mpoly_find(region,
-                                             mval_f,
-                                             &me_eval_mpoly[i],
-                                             me_eval_mvert,
-                                             me_eval_mloop,
-                                             &len_best,
-                                             &v_idx_best);
+          ed_mesh_pick_face_vert__mpoly_find(
+              region, mval_f, &polys[i], verts.data(), loops.data(), &len_best, &v_idx_best);
         }
       }
     }
     else {
-      if (poly_index < me_eval_mpoly_len) {
+      if (poly_index < polys.size()) {
         ed_mesh_pick_face_vert__mpoly_find(region,
                                            mval_f,
-                                           &me_eval_mpoly[poly_index],
-                                           me_eval_mvert,
-                                           me_eval_mloop,
+                                           &polys[poly_index],
+                                           verts.data(),
+                                           loops.data(),
                                            &len_best,
                                            &v_idx_best);
       }
@@ -1329,6 +1325,7 @@ bool ED_mesh_pick_face_vert(
  */
 struct VertPickData {
   const MVert *mvert;
+  const bool *hide_vert;
   const float *mval_f; /* [2] */
   ARegion *region;
 
@@ -1343,16 +1340,16 @@ static void ed_mesh_pick_vert__mapFunc(void *userData,
                                        const float UNUSED(no[3]))
 {
   VertPickData *data = static_cast<VertPickData *>(userData);
-  if ((data->mvert[index].flag & ME_HIDE) == 0) {
-    float sco[2];
-
-    if (ED_view3d_project_float_object(data->region, co, sco, V3D_PROJ_TEST_CLIP_DEFAULT) ==
-        V3D_PROJ_RET_OK) {
-      const float len = len_manhattan_v2v2(data->mval_f, sco);
-      if (len < data->len_best) {
-        data->len_best = len;
-        data->v_idx_best = index;
-      }
+  if (data->hide_vert && data->hide_vert[index]) {
+    return;
+  }
+  float sco[2];
+  if (ED_view3d_project_float_object(data->region, co, sco, V3D_PROJ_TEST_CLIP_DEFAULT) ==
+      V3D_PROJ_RET_OK) {
+    const float len = len_manhattan_v2v2(data->mval_f, sco);
+    if (len < data->len_best) {
+      data->len_best = len;
+      data->v_idx_best = index;
     }
   }
 }
@@ -1411,11 +1408,14 @@ bool ED_mesh_pick_vert(
     }
 
     /* setup data */
-    data.mvert = me->mvert;
+    const Span<MVert> verts = me->verts();
+    data.mvert = verts.data();
     data.region = region;
     data.mval_f = mval_f;
     data.len_best = FLT_MAX;
     data.v_idx_best = -1;
+    data.hide_vert = (const bool *)CustomData_get_layer_named(
+        &me_eval->vdata, CD_PROP_BOOL, ".hide_vert");
 
     BKE_mesh_foreach_mapped_vert(me_eval, ed_mesh_pick_vert__mapFunc, &data, MESH_FOREACH_NOP);
 
@@ -1463,10 +1463,11 @@ MDeformVert *ED_mesh_active_dvert_get_ob(Object *ob, int *r_index)
   if (r_index) {
     *r_index = index;
   }
-  if (index == -1 || me->dvert == nullptr) {
+  if (index == -1 || me->deform_verts().is_empty()) {
     return nullptr;
   }
-  return me->dvert + index;
+  MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
+  return &dverts[index];
 }
 
 MDeformVert *ED_mesh_active_dvert_get_only(Object *ob)
diff --git a/source/blender/editors/metaball/editmball_undo.c b/source/blender/editors/metaball/editmball_undo.c
index 5f13e822f84..0f9049ad70c 100644
--- a/source/blender/editors/metaball/editmball_undo.c
+++ b/source/blender/editors/metaball/editmball_undo.c
@@ -109,8 +109,10 @@ static void undomball_free_data(UndoMBall *umb)
 
 static Object *editmball_object_from_context(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit && obedit->type == OB_MBALL) {
     MetaBall *mb = obedit->data;
     if (mb->editelems != NULL) {
@@ -150,9 +152,10 @@ static bool mball_undosys_step_encode(struct bContext *C, struct Main *bmain, Un
 
   /* Important not to use the 3D view when getting objects because all objects
    * outside of this list will be moved out of edit-mode when reading back undo steps. */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
-  Object **objects = ED_undo_editmode_objects_from_view_layer(view_layer, &objects_len);
+  Object **objects = ED_undo_editmode_objects_from_view_layer(scene, view_layer, &objects_len);
 
   us->elems = MEM_callocN(sizeof(*us->elems) * objects_len, __func__);
   us->elems_len = objects_len;
diff --git a/source/blender/editors/metaball/mball_edit.c b/source/blender/editors/metaball/mball_edit.c
index 06a649e5b6c..9515306a26c 100644
--- a/source/blender/editors/metaball/mball_edit.c
+++ b/source/blender/editors/metaball/mball_edit.c
@@ -90,7 +90,7 @@ bool ED_mball_deselect_all_multi(bContext *C)
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc.view_layer, vc.v3d, &bases_len);
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
   bool changed_multi = BKE_mball_deselect_all_multi_ex(bases, bases_len);
   MEM_freeN(bases);
   return changed_multi;
@@ -145,10 +145,11 @@ static int mball_select_all_exec(bContext *C, wmOperator *op)
 {
   int action = RNA_enum_get(op->ptr, "action");
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
 
   if (action == SEL_TOGGLE) {
     action = BKE_mball_is_any_selected_multi(bases, bases_len) ? SEL_DESELECT : SEL_SELECT;
@@ -330,10 +331,11 @@ static int mball_select_similar_exec(bContext *C, wmOperator *op)
   const float thresh = RNA_float_get(op->ptr, "threshold");
   int tot_mball_selected_all = 0;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &bases_len);
+      scene, view_layer, CTX_wm_view3d(C), &bases_len);
 
   tot_mball_selected_all = BKE_mball_select_count_multi(bases, bases_len);
 
@@ -463,10 +465,11 @@ static int select_random_metaelems_exec(bContext *C, wmOperator *op)
   const float randfac = RNA_float_get(op->ptr, "ratio");
   const int seed = WM_operator_properties_select_random_seed_increment_get(op);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     MetaBall *mb = (MetaBall *)obedit->data;
@@ -529,10 +532,11 @@ void MBALL_OT_select_random_metaelems(struct wmOperatorType *ot)
 /* Duplicate selected MetaElements */
 static int duplicate_metaelems_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     MetaBall *mb = (MetaBall *)obedit->data;
@@ -586,10 +590,11 @@ void MBALL_OT_duplicate_metaelems(wmOperatorType *ot)
 
 static int delete_metaelems_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     MetaBall *mb = (MetaBall *)obedit->data;
@@ -744,7 +749,7 @@ Base *ED_mball_base_and_elem_from_select_buffer(Base **bases,
   const uint hit_object = select_id & 0xFFFF;
   Base *base = NULL;
   MetaElem *ml = NULL;
-  /* TODO(campbell): optimize, eg: sort & binary search. */
+  /* TODO(@campbellbarton): optimize, eg: sort & binary search. */
   for (uint base_index = 0; base_index < bases_len; base_index++) {
     if (bases[base_index]->object->runtime.select_id == hit_object) {
       base = bases[base_index];
@@ -790,7 +795,8 @@ static bool ed_mball_findnearest_metaelem(bContext *C,
   }
 
   uint bases_len = 0;
-  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(vc.view_layer, vc.v3d, &bases_len);
+  Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
+      vc.scene, vc.view_layer, vc.v3d, &bases_len);
 
   int hit_cycle_offset = 0;
   if (use_cycle) {
@@ -900,7 +906,7 @@ bool ED_mball_select_pick(bContext *C, const int mval[2], const struct SelectPic
         break;
       }
     }
-
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     MetaBall *mb = (MetaBall *)base->object->data;
     mb->lastelem = ml;
@@ -908,7 +914,8 @@ bool ED_mball_select_pick(bContext *C, const int mval[2], const struct SelectPic
     DEG_id_tag_update(&mb->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_GEOM | ND_SELECT, mb);
 
-    if (view_layer->basact != base) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (BKE_view_layer_active_base_get(view_layer) != base) {
       ED_object_base_activate(C, base);
     }
 
diff --git a/source/blender/editors/object/CMakeLists.txt b/source/blender/editors/object/CMakeLists.txt
index 97376a495c1..17365cc5488 100644
--- a/source/blender/editors/object/CMakeLists.txt
+++ b/source/blender/editors/object/CMakeLists.txt
@@ -21,7 +21,6 @@ set(INC
   ../../shader_fx
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 
   # dna_type_offsets.h in BLO_read_write.h
@@ -53,7 +52,7 @@ set(SRC
   object_shapekey.c
   object_transform.cc
   object_utils.c
-  object_vgroup.c
+  object_vgroup.cc
   object_volume.c
   object_warp.c
 
@@ -76,7 +75,6 @@ endif()
 if(WITH_EXPERIMENTAL_FEATURES)
   add_definitions(-DWITH_SIMULATION_DATABLOCK)
   add_definitions(-DWITH_POINT_CLOUD)
-  add_definitions(-DWITH_NEW_CURVES_TYPE)
 endif()
 
 blender_add_lib(bf_editor_object "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
diff --git a/source/blender/editors/object/object_add.cc b/source/blender/editors/object/object_add.cc
index 66e76addd6f..9d06a6d5f40 100644
--- a/source/blender/editors/object/object_add.cc
+++ b/source/blender/editors/object/object_add.cc
@@ -609,7 +609,8 @@ Object *ED_object_add_type_with_obdata(bContext *C,
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   {
-    Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obedit = BKE_view_layer_edit_object_get(view_layer);
     if (obedit != nullptr) {
       ED_object_editmode_exit_ex(bmain, scene, obedit, EM_FREEDATA);
     }
@@ -619,17 +620,18 @@ Object *ED_object_add_type_with_obdata(bContext *C,
   Object *ob;
   if (obdata != nullptr) {
     BLI_assert(type == BKE_object_obdata_to_type(obdata));
-    ob = BKE_object_add_for_data(bmain, view_layer, type, name, obdata, true);
+    ob = BKE_object_add_for_data(bmain, scene, view_layer, type, name, obdata, true);
     const short *materials_len_p = BKE_id_material_len_p(obdata);
     if (materials_len_p && *materials_len_p > 0) {
       BKE_object_materials_test(bmain, ob, static_cast<ID *>(ob->data));
     }
   }
   else {
-    ob = BKE_object_add(bmain, view_layer, type, name);
+    ob = BKE_object_add(bmain, scene, view_layer, type, name);
   }
 
-  Base *ob_base_act = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *ob_base_act = BKE_view_layer_active_base_get(view_layer);
   /* While not getting a valid base is not a good thing, it can happen in convoluted corner cases,
    * better not crash on it in releases. */
   BLI_assert(ob_base_act != nullptr);
@@ -657,8 +659,7 @@ Object *ED_object_add_type_with_obdata(bContext *C,
 
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER_CONTENT, scene);
 
-  /* TODO(sergey): Use proper flag for tagging here. */
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   ED_outliner_select_sync_from_object_tag(C);
 
@@ -991,7 +992,8 @@ static int object_metaball_add_exec(bContext *C, wmOperator *op)
   }
 
   bool newob = false;
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit == nullptr || obedit->type != OB_MBALL) {
     obedit = ED_object_add_type(C, OB_MBALL, nullptr, loc, rot, true, local_view_bits);
     newob = true;
@@ -1100,7 +1102,8 @@ static int object_armature_add_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
 
   RegionView3D *rv3d = CTX_wm_region_view3d(C);
   bool newob = false;
@@ -1335,21 +1338,21 @@ static int object_gpencil_add_exec(bContext *C, wmOperator *op)
     const char *ob_name = nullptr;
     switch (type) {
       case GP_EMPTY: {
-        ob_name = "GPencil";
+        ob_name = CTX_DATA_(BLT_I18NCONTEXT_ID_GPENCIL, "GPencil");
         break;
       }
       case GP_MONKEY: {
-        ob_name = "Suzanne";
+        ob_name = CTX_DATA_(BLT_I18NCONTEXT_ID_GPENCIL, "Suzanne");
         break;
       }
       case GP_STROKE: {
-        ob_name = "Stroke";
+        ob_name = CTX_DATA_(BLT_I18NCONTEXT_ID_GPENCIL, "Stroke");
         break;
       }
       case GP_LRT_OBJECT:
       case GP_LRT_SCENE:
       case GP_LRT_COLLECTION: {
-        ob_name = "Line Art";
+        ob_name = CTX_DATA_(BLT_I18NCONTEXT_ID_GPENCIL, "LineArt");
         break;
       }
       default: {
@@ -2071,16 +2074,17 @@ static int object_curves_empty_hair_add_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
 
   ushort local_view_bits;
-  blender::float3 loc, rot;
   if (!ED_object_add_generic_get_opts(
-          C, op, 'Z', loc, rot, nullptr, nullptr, &local_view_bits, nullptr)) {
+          C, op, 'Z', nullptr, nullptr, nullptr, nullptr, &local_view_bits, nullptr)) {
     return OPERATOR_CANCELLED;
   }
 
   Object *surface_ob = CTX_data_active_object(C);
   BLI_assert(surface_ob != nullptr);
 
-  Object *curves_ob = ED_object_add_type(C, OB_CURVES, nullptr, loc, rot, false, local_view_bits);
+  Object *curves_ob = ED_object_add_type(
+      C, OB_CURVES, nullptr, nullptr, nullptr, false, local_view_bits);
+  BKE_object_apply_mat4(curves_ob, surface_ob->obmat, false, false);
 
   /* Set surface object. */
   Curves *curves_id = static_cast<Curves *>(curves_ob->data);
@@ -2534,6 +2538,7 @@ static void make_object_duplilist_real(bContext *C,
     }
 
     BKE_collection_object_add_from(bmain, scene, base->object, ob_dst);
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base_dst = BKE_view_layer_base_find(view_layer, ob_dst);
     BLI_assert(base_dst != nullptr);
 
@@ -2770,25 +2775,6 @@ static const EnumPropertyItem convert_target_items[] = {
     {0, nullptr, 0, nullptr, nullptr},
 };
 
-static void object_data_convert_ensure_curve_cache(Depsgraph *depsgraph, Scene *scene, Object *ob)
-{
-  if (ob->runtime.curve_cache == nullptr) {
-    /* Force creation. This is normally not needed but on operator
-     * redo we might end up with an object which isn't evaluated yet.
-     * Also happens in case we are working on a copy of the object
-     * (all its caches have been nuked then).
-     */
-    if (ELEM(ob->type, OB_SURF, OB_CURVES_LEGACY, OB_FONT)) {
-      /* We need 'for render' ON here, to enable computing bevel #DispList if needed.
-       * Also makes sense anyway, we would not want e.g. to lose hidden parts etc. */
-      BKE_displist_make_curveTypes(depsgraph, scene, ob, true);
-    }
-    else if (ob->type == OB_MBALL) {
-      BKE_displist_make_mball(depsgraph, scene, ob);
-    }
-  }
-}
-
 static void object_data_convert_curve_to_mesh(Main *bmain, Depsgraph *depsgraph, Object *ob)
 {
   Object *object_eval = DEG_get_evaluated_object(depsgraph, ob);
@@ -2850,6 +2836,7 @@ static Base *duplibase_for_convert(
   DEG_id_tag_update(&obn->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
   BKE_collection_object_add_from(bmain, scene, ob, obn);
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *basen = BKE_view_layer_base_find(view_layer, obn);
   ED_object_base_select(basen, BA_SELECT);
   ED_object_base_select(base, BA_DESELECT);
@@ -2907,7 +2894,7 @@ static int object_convert_exec(bContext *C, wmOperator *op)
   const bool use_faces = RNA_boolean_get(op->ptr, "faces");
   const float offset = RNA_float_get(op->ptr, "offset");
 
-  int a, mballConverted = 0;
+  int mballConverted = 0;
   bool gpencilConverted = false;
   bool gpencilCurveConverted = false;
 
@@ -3170,14 +3157,14 @@ static int object_convert_exec(bContext *C, wmOperator *op)
       BKE_mesh_edges_set_draw_render(me_eval);
       BKE_object_material_from_eval_data(bmain, newob, &me_eval->id);
       Mesh *new_mesh = (Mesh *)newob->data;
-      BKE_mesh_nomain_to_mesh(me_eval, new_mesh, newob, &CD_MASK_MESH, true);
+      BKE_mesh_nomain_to_mesh(me_eval, new_mesh, newob);
 
       if (do_merge_customdata) {
         BKE_mesh_merge_customdata_for_apply_modifier(new_mesh);
       }
 
       /* Anonymous attributes shouldn't be available on the applied geometry. */
-      blender::bke::mesh_attributes_for_write(*new_mesh).remove_anonymous();
+      new_mesh->attributes_for_write().remove_anonymous();
 
       BKE_object_free_modifiers(newob, 0); /* after derivedmesh calls! */
     }
@@ -3255,7 +3242,7 @@ static int object_convert_exec(bContext *C, wmOperator *op)
         /* No assumption should be made that the resulting objects is a mesh, as conversion can
          * fail. */
         object_data_convert_curve_to_mesh(bmain, depsgraph, newob);
-        /* meshes doesn't use displist */
+        /* Meshes doesn't use the "curve cache". */
         BKE_object_free_curve_cache(newob);
       }
       else if (target == OB_GPENCIL) {
@@ -3290,7 +3277,7 @@ static int object_convert_exec(bContext *C, wmOperator *op)
         /* No assumption should be made that the resulting objects is a mesh, as conversion can
          * fail. */
         object_data_convert_curve_to_mesh(bmain, depsgraph, newob);
-        /* meshes doesn't use displist */
+        /* Meshes don't use the "curve cache". */
         BKE_object_free_curve_cache(newob);
       }
       else if (target == OB_GPENCIL) {
@@ -3320,7 +3307,7 @@ static int object_convert_exec(bContext *C, wmOperator *op)
       baseob = BKE_mball_basis_find(scene, ob);
 
       if (ob != baseob) {
-        /* if motherball is converting it would be marked as done later */
+        /* If mother-ball is converting it would be marked as done later. */
         ob->flag |= OB_DONE;
       }
 
@@ -3331,21 +3318,13 @@ static int object_convert_exec(bContext *C, wmOperator *op)
         MetaBall *mb = static_cast<MetaBall *>(newob->data);
         id_us_min(&mb->id);
 
-        newob->data = BKE_mesh_add(bmain, "Mesh");
-        newob->type = OB_MESH;
-
-        Mesh *me = static_cast<Mesh *>(newob->data);
-        me->totcol = mb->totcol;
-        if (newob->totcol) {
-          me->mat = static_cast<Material **>(MEM_dupallocN(mb->mat));
-          for (a = 0; a < newob->totcol; a++) {
-            id_us_plus((ID *)me->mat[a]);
-          }
-        }
+        /* Find the evaluated mesh of the basis metaball object. */
+        Object *object_eval = DEG_get_evaluated_object(depsgraph, baseob);
+        Mesh *mesh = BKE_mesh_new_from_object_to_bmain(bmain, depsgraph, object_eval, true);
 
-        object_data_convert_ensure_curve_cache(depsgraph, scene, baseob);
-        BKE_mesh_from_metaball(&baseob->runtime.curve_cache->disp,
-                               static_cast<Mesh *>(newob->data));
+        id_us_plus(&mesh->id);
+        newob->data = mesh;
+        newob->type = OB_MESH;
 
         if (obact->type == OB_MBALL) {
           basact = basen;
@@ -3394,7 +3373,7 @@ static int object_convert_exec(bContext *C, wmOperator *op)
     /* If the original object is active then make this object active */
     if (basen) {
       if (ob == obact) {
-        /* store new active base to update BASACT */
+        /* Store new active base to update view layer. */
         basact = basen;
       }
 
@@ -3468,11 +3447,15 @@ static int object_convert_exec(bContext *C, wmOperator *op)
   if (basact) {
     /* active base was changed */
     ED_object_base_activate(C, basact);
-    BASACT(view_layer) = basact;
+    view_layer->basact = basact;
   }
-  else if (BASACT(view_layer)->object->flag & OB_DONE) {
-    WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, BASACT(view_layer)->object);
-    WM_event_add_notifier(C, NC_OBJECT | ND_DATA, BASACT(view_layer)->object);
+  else {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *object = BKE_view_layer_active_object_get(view_layer);
+    if (object->flag & OB_DONE) {
+      WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, object);
+      WM_event_add_notifier(C, NC_OBJECT | ND_DATA, object);
+    }
   }
 
   DEG_relations_tag_update(bmain);
@@ -3527,11 +3510,12 @@ void OBJECT_OT_convert(wmOperatorType *ot)
   /* properties */
   ot->prop = RNA_def_enum(
       ot->srna, "target", convert_target_items, OB_MESH, "Target", "Type of object to convert to");
-  RNA_def_boolean(ot->srna,
-                  "keep_original",
-                  false,
-                  "Keep Original",
-                  "Keep original objects instead of replacing them");
+  prop = RNA_def_boolean(ot->srna,
+                         "keep_original",
+                         false,
+                         "Keep Original",
+                         "Keep original objects instead of replacing them");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_OBJECT);
 
   RNA_def_boolean(
       ot->srna,
@@ -3599,8 +3583,9 @@ static Base *object_add_duplicate_internal(Main *bmain,
     }
     DEG_id_tag_update(&obn->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
 
+    BKE_view_layer_synced_ensure(scene, view_layer);
     base = BKE_view_layer_base_find(view_layer, ob);
-    if ((base != nullptr) && (base->flag & BASE_VISIBLE_DEPSGRAPH)) {
+    if ((base != nullptr) && (base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT)) {
       BKE_collection_object_add_from(bmain, scene, ob, obn);
     }
     else {
@@ -3608,6 +3593,7 @@ static Base *object_add_duplicate_internal(Main *bmain,
       BKE_collection_object_add(bmain, layer_collection->collection, obn);
     }
 
+    BKE_view_layer_synced_ensure(scene, view_layer);
     basen = BKE_view_layer_base_find(view_layer, obn);
     if (base != nullptr && basen != nullptr) {
       basen->local_view_bits = base->local_view_bits;
@@ -3691,7 +3677,7 @@ static int duplicate_exec(bContext *C, wmOperator *op)
   Object *ob_new_active = nullptr;
 
   CTX_DATA_BEGIN (C, Base *, base, selected_bases) {
-    Object *ob_new = NULL;
+    Object *ob_new = nullptr;
     object_add_duplicate_internal(bmain,
                                   scene,
                                   view_layer,
@@ -3709,23 +3695,26 @@ static int duplicate_exec(bContext *C, wmOperator *op)
     ED_object_base_select(base, BA_DESELECT);
 
     /* new object will become active */
-    if (BASACT(view_layer) == base) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (BKE_view_layer_active_base_get(view_layer) == base) {
       ob_new_active = ob_new;
     }
   }
   CTX_DATA_END;
+  BKE_layer_collection_resync_allow();
 
   if (source_bases_new_objects.is_empty()) {
     return OPERATOR_CANCELLED;
   }
+
   /* Sync the collection now, after everything is duplicated. */
-  BKE_layer_collection_resync_allow();
   BKE_main_collection_sync(bmain);
 
   /* After sync we can get to the new Base data, process it here. */
   for (const auto &item : source_bases_new_objects) {
     Object *ob_new = item.second;
     Base *base_source = item.first;
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base_new = BKE_view_layer_base_find(view_layer, ob_new);
     if (base_new == nullptr) {
       continue;
@@ -3837,7 +3826,7 @@ static int object_add_named_exec(bContext *C, wmOperator *op)
 
   /* object_add_duplicate_internal() doesn't deselect other objects, unlike object_add_common() or
    * BKE_view_layer_base_deselect_all(). */
-  ED_object_base_deselect_all(view_layer, nullptr, SEL_DESELECT);
+  ED_object_base_deselect_all(scene, view_layer, nullptr, SEL_DESELECT);
   ED_object_base_select(basen, BA_SELECT);
   ED_object_base_activate(C, basen);
 
@@ -3914,13 +3903,15 @@ void OBJECT_OT_add_named(wmOperatorType *ot)
 static int object_transform_to_mouse_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   Object *ob = reinterpret_cast<Object *>(
       WM_operator_properties_id_lookup_from_name_or_session_uuid(bmain, op->ptr, ID_OB));
 
   if (!ob) {
-    ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    ob = BKE_view_layer_active_object_get(view_layer);
   }
 
   if (ob == nullptr) {
@@ -3992,7 +3983,7 @@ void OBJECT_OT_transform_to_mouse(wmOperatorType *ot)
   /* api callbacks */
   ot->invoke = object_add_drop_xy_generic_invoke;
   ot->exec = object_transform_to_mouse_exec;
-  ot->poll = ED_operator_objectmode;
+  ot->poll = ED_operator_objectmode_poll_msg;
 
   /* flags */
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
diff --git a/source/blender/editors/object/object_bake.c b/source/blender/editors/object/object_bake.c
index effbde41c38..8d505bbca3e 100644
--- a/source/blender/editors/object/object_bake.c
+++ b/source/blender/editors/object/object_bake.c
@@ -155,15 +155,16 @@ static bool multiresbake_check(bContext *C, wmOperator *op)
       break;
     }
 
-    if (!me->mloopuv) {
+    if (!CustomData_has_layer(&me->ldata, CD_MLOOPUV)) {
       BKE_report(op->reports, RPT_ERROR, "Mesh should be unwrapped before multires data baking");
 
       ok = false;
     }
     else {
+      const int *material_indices = BKE_mesh_material_indices(me);
       a = me->totpoly;
       while (ok && a--) {
-        Image *ima = bake_object_image_get(ob, me->mpoly[a].mat_nr);
+        Image *ima = bake_object_image_get(ob, material_indices ? material_indices[a] : 0);
 
         if (!ima) {
           BKE_report(
diff --git a/source/blender/editors/object/object_bake_api.c b/source/blender/editors/object/object_bake_api.c
index 58daf753679..bdaa3523402 100644
--- a/source/blender/editors/object/object_bake_api.c
+++ b/source/blender/editors/object/object_bake_api.c
@@ -24,6 +24,7 @@
 #include "BKE_attribute.h"
 #include "BKE_callbacks.h"
 #include "BKE_context.h"
+#include "BKE_editmesh.h"
 #include "BKE_global.h"
 #include "BKE_image.h"
 #include "BKE_image_format.h"
@@ -324,7 +325,7 @@ static bool write_external_bake_pixels(const char *filepath,
                                        const int height,
                                        const int margin,
                                        const int margin_type,
-                                       ImageFormatData *im_format,
+                                       ImageFormatData const *im_format,
                                        const bool is_noncolor,
                                        Mesh const *mesh_eval,
                                        char const *uv_layer,
@@ -418,11 +419,13 @@ static bool is_noncolor_pass(eScenePassType pass_type)
 }
 
 /* if all is good tag image and return true */
-static bool bake_object_check(ViewLayer *view_layer,
+static bool bake_object_check(const Scene *scene,
+                              ViewLayer *view_layer,
                               Object *ob,
                               const eBakeTarget target,
                               ReportList *reports)
 {
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, ob);
 
   if (base == NULL) {
@@ -590,6 +593,7 @@ static bool bake_pass_filter_check(eScenePassType pass_type,
 
 /* before even getting in the bake function we check for some basic errors */
 static bool bake_objects_check(Main *bmain,
+                               const Scene *scene,
                                ViewLayer *view_layer,
                                Object *ob,
                                ListBase *selected_objects,
@@ -605,7 +609,7 @@ static bool bake_objects_check(Main *bmain,
   if (is_selected_to_active) {
     int tot_objects = 0;
 
-    if (!bake_object_check(view_layer, ob, target, reports)) {
+    if (!bake_object_check(scene, view_layer, ob, target, reports)) {
       return false;
     }
 
@@ -639,7 +643,7 @@ static bool bake_objects_check(Main *bmain,
     }
 
     for (link = selected_objects->first; link; link = link->next) {
-      if (!bake_object_check(view_layer, link->ptr.data, target, reports)) {
+      if (!bake_object_check(scene, view_layer, link->ptr.data, target, reports)) {
         return false;
       }
     }
@@ -933,7 +937,10 @@ static bool bake_targets_output_external(const BakeAPIRender *bkr,
 
 /* Vertex Color Bake Targets */
 
-static bool bake_targets_init_vertex_colors(BakeTargets *targets, Object *ob, ReportList *reports)
+static bool bake_targets_init_vertex_colors(Main *bmain,
+                                            BakeTargets *targets,
+                                            Object *ob,
+                                            ReportList *reports)
 {
   if (ob->type != OB_MESH) {
     BKE_report(reports, RPT_ERROR, "Color attribute baking is only supported for mesh objects");
@@ -946,6 +953,9 @@ static bool bake_targets_init_vertex_colors(BakeTargets *targets, Object *ob, Re
     return false;
   }
 
+  /* Ensure mesh and editmesh topology are in sync. */
+  ED_object_editmode_load(bmain, ob);
+
   targets->images = MEM_callocN(sizeof(BakeImage), "BakeTargets.images");
   targets->images_num = 1;
 
@@ -964,7 +974,8 @@ static bool bake_targets_init_vertex_colors(BakeTargets *targets, Object *ob, Re
   return true;
 }
 
-static int find_original_loop(const Mesh *me_orig,
+static int find_original_loop(const MPoly *orig_polys,
+                              const MLoop *orig_loops,
                               const int *vert_origindex,
                               const int *poly_origindex,
                               const int poly_eval,
@@ -980,8 +991,8 @@ static int find_original_loop(const Mesh *me_orig,
   }
 
   /* Find matching loop with original vertex in original polygon. */
-  MPoly *mpoly_orig = me_orig->mpoly + poly_orig;
-  MLoop *mloop_orig = me_orig->mloop + mpoly_orig->loopstart;
+  const MPoly *mpoly_orig = orig_polys + poly_orig;
+  const MLoop *mloop_orig = orig_loops + mpoly_orig->loopstart;
   for (int j = 0; j < mpoly_orig->totloop; ++j, ++mloop_orig) {
     if (mloop_orig->v == vert_orig) {
       return mpoly_orig->loopstart + j;
@@ -1018,23 +1029,31 @@ static void bake_targets_populate_pixels_color_attributes(BakeTargets *targets,
   const int tottri = poly_to_tri_count(me_eval->totpoly, me_eval->totloop);
   MLoopTri *looptri = MEM_mallocN(sizeof(*looptri) * tottri, __func__);
 
-  BKE_mesh_recalc_looptri(
-      me_eval->mloop, me_eval->mpoly, me_eval->mvert, me_eval->totloop, me_eval->totpoly, looptri);
+  const MLoop *loops = BKE_mesh_loops(me_eval);
+  BKE_mesh_recalc_looptri(loops,
+                          BKE_mesh_polys(me_eval),
+                          BKE_mesh_verts(me_eval),
+                          me_eval->totloop,
+                          me_eval->totpoly,
+                          looptri);
 
   /* For mapping back to original mesh in case there are modifiers. */
   const int *vert_origindex = CustomData_get_layer(&me_eval->vdata, CD_ORIGINDEX);
   const int *poly_origindex = CustomData_get_layer(&me_eval->pdata, CD_ORIGINDEX);
+  const MPoly *orig_polys = BKE_mesh_polys(me);
+  const MLoop *orig_loops = BKE_mesh_loops(me);
 
   for (int i = 0; i < tottri; i++) {
     const MLoopTri *lt = &looptri[i];
 
     for (int j = 0; j < 3; j++) {
       unsigned int l = lt->tri[j];
-      unsigned int v = me_eval->mloop[l].v;
+      unsigned int v = loops[l].v;
 
       /* Map back to original loop if there are modifiers. */
       if (vert_origindex != NULL && poly_origindex != NULL) {
-        l = find_original_loop(me, vert_origindex, poly_origindex, lt->poly, v);
+        l = find_original_loop(
+            orig_polys, orig_loops, vert_origindex, poly_origindex, lt->poly, v);
         if (l == ORIGINDEX_NONE || l >= me->totloop) {
           continue;
         }
@@ -1109,6 +1128,7 @@ static void convert_float_color_to_byte_color(const MPropCol *float_colors,
 static bool bake_targets_output_vertex_colors(BakeTargets *targets, Object *ob)
 {
   Mesh *me = ob->data;
+  BMEditMesh *em = me->edit_mesh;
   CustomDataLayer *active_color_layer = BKE_id_attributes_active_color_get(&me->id);
   BLI_assert(active_color_layer != NULL);
   const eAttrDomain domain = BKE_id_attribute_domain(&me->id, active_color_layer);
@@ -1121,15 +1141,13 @@ static bool bake_targets_output_vertex_colors(BakeTargets *targets, Object *ob)
     const int totvert = me->totvert;
     const int totloop = me->totloop;
 
-    MPropCol *mcol = active_color_layer->type == CD_PROP_COLOR ?
-                         active_color_layer->data :
-                         MEM_malloc_arrayN(totvert, sizeof(MPropCol), __func__);
+    MPropCol *mcol = MEM_malloc_arrayN(totvert, sizeof(MPropCol), __func__);
 
     /* Accumulate float vertex colors in scene linear color space. */
     int *num_loops_for_vertex = MEM_callocN(sizeof(int) * me->totvert, "num_loops_for_vertex");
     memset(mcol, 0, sizeof(MPropCol) * me->totvert);
 
-    MLoop *mloop = me->mloop;
+    const MLoop *mloop = BKE_mesh_loops(me);
     for (int i = 0; i < totloop; i++, mloop++) {
       const int v = mloop->v;
       bake_result_add_to_rgba(mcol[v].color, &result[i * channels_num], channels_num);
@@ -1143,24 +1161,75 @@ static bool bake_targets_output_vertex_colors(BakeTargets *targets, Object *ob)
       }
     }
 
-    if (mcol != active_color_layer->data) {
-      convert_float_color_to_byte_color(mcol, totvert, is_noncolor, active_color_layer->data);
-      MEM_freeN(mcol);
+    if (em) {
+      /* Copy to bmesh. */
+      const int active_color_offset = CustomData_get_offset_named(
+          &em->bm->vdata, active_color_layer->type, active_color_layer->name);
+      BMVert *v;
+      BMIter viter;
+      int i = 0;
+      BM_ITER_MESH (v, &viter, em->bm, BM_VERTS_OF_MESH) {
+        void *data = BM_ELEM_CD_GET_VOID_P(v, active_color_offset);
+        if (active_color_layer->type == CD_PROP_COLOR) {
+          memcpy(data, &mcol[i], sizeof(MPropCol));
+        }
+        else {
+          convert_float_color_to_byte_color(&mcol[i], 1, is_noncolor, data);
+        }
+        i++;
+      }
+    }
+    else {
+      /* Copy to mesh. */
+      if (active_color_layer->type == CD_PROP_COLOR) {
+        memcpy(active_color_layer->data, mcol, sizeof(MPropCol) * me->totvert);
+      }
+      else {
+        convert_float_color_to_byte_color(mcol, totvert, is_noncolor, active_color_layer->data);
+      }
     }
 
+    MEM_freeN(mcol);
+
     MEM_SAFE_FREE(num_loops_for_vertex);
   }
   else if (domain == ATTR_DOMAIN_CORNER) {
-    switch (active_color_layer->type) {
-      case CD_PROP_COLOR: {
+    if (em) {
+      /* Copy to bmesh. */
+      const int active_color_offset = CustomData_get_offset_named(
+          &em->bm->ldata, active_color_layer->type, active_color_layer->name);
+      BMFace *f;
+      BMIter fiter;
+      int i = 0;
+      BM_ITER_MESH (f, &fiter, em->bm, BM_FACES_OF_MESH) {
+        BMLoop *l;
+        BMIter liter;
+        BM_ITER_ELEM (l, &liter, f, BM_LOOPS_OF_FACE) {
+          MPropCol color;
+          zero_v4(color.color);
+          bake_result_add_to_rgba(color.color, &result[i * channels_num], channels_num);
+          i++;
+
+          void *data = BM_ELEM_CD_GET_VOID_P(l, active_color_offset);
+          if (active_color_layer->type == CD_PROP_COLOR) {
+            memcpy(data, &color, sizeof(MPropCol));
+          }
+          else {
+            convert_float_color_to_byte_color(&color, 1, is_noncolor, data);
+          }
+        }
+      }
+    }
+    else {
+      /* Copy to mesh. */
+      if (active_color_layer->type == CD_PROP_COLOR) {
         MPropCol *colors = active_color_layer->data;
         for (int i = 0; i < me->totloop; i++) {
           zero_v4(colors[i].color);
           bake_result_add_to_rgba(colors[i].color, &result[i * channels_num], channels_num);
         }
-        break;
       }
-      case CD_PROP_BYTE_COLOR: {
+      else {
         MLoopCol *colors = active_color_layer->data;
         for (int i = 0; i < me->totloop; i++) {
           MPropCol color;
@@ -1168,10 +1237,7 @@ static bool bake_targets_output_vertex_colors(BakeTargets *targets, Object *ob)
           bake_result_add_to_rgba(color.color, &result[i * channels_num], channels_num);
           convert_float_color_to_byte_color(&color, 1, is_noncolor, &colors[i]);
         }
-        break;
       }
-      default:
-        BLI_assert_unreachable();
     }
   }
 
@@ -1201,7 +1267,7 @@ static bool bake_targets_init(const BakeAPIRender *bkr,
     }
   }
   else if (bkr->target == R_BAKE_TARGET_VERTEX_COLORS) {
-    if (!bake_targets_init_vertex_colors(targets, ob, reports)) {
+    if (!bake_targets_init_vertex_colors(bkr->main, targets, ob, reports)) {
       return false;
     }
   }
@@ -1346,7 +1412,8 @@ static int bake(const BakeAPIRender *bkr,
       else {
         ob_cage_eval = DEG_get_evaluated_object(depsgraph, ob_cage);
         ob_cage_eval->visibility_flag |= OB_HIDE_RENDER;
-        ob_cage_eval->base_flag &= ~(BASE_VISIBLE_DEPSGRAPH | BASE_ENABLED_RENDER);
+        ob_cage_eval->base_flag &= ~(BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT |
+                                     BASE_ENABLED_RENDER);
       }
     }
   }
@@ -1446,7 +1513,8 @@ static int bake(const BakeAPIRender *bkr,
       highpoly[i].ob = ob_iter;
       highpoly[i].ob_eval = DEG_get_evaluated_object(depsgraph, ob_iter);
       highpoly[i].ob_eval->visibility_flag &= ~OB_HIDE_RENDER;
-      highpoly[i].ob_eval->base_flag |= (BASE_VISIBLE_DEPSGRAPH | BASE_ENABLED_RENDER);
+      highpoly[i].ob_eval->base_flag |= (BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT |
+                                         BASE_ENABLED_RENDER);
       highpoly[i].me = BKE_mesh_new_from_object(NULL, highpoly[i].ob_eval, false, false);
 
       /* Low-poly to high-poly transformation matrix. */
@@ -1462,10 +1530,11 @@ static int bake(const BakeAPIRender *bkr,
 
     if (ob_cage != NULL) {
       ob_cage_eval->visibility_flag |= OB_HIDE_RENDER;
-      ob_cage_eval->base_flag &= ~(BASE_VISIBLE_DEPSGRAPH | BASE_ENABLED_RENDER);
+      ob_cage_eval->base_flag &= ~(BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT |
+                                   BASE_ENABLED_RENDER);
     }
     ob_low_eval->visibility_flag |= OB_HIDE_RENDER;
-    ob_low_eval->base_flag &= ~(BASE_VISIBLE_DEPSGRAPH | BASE_ENABLED_RENDER);
+    ob_low_eval->base_flag &= ~(BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT | BASE_ENABLED_RENDER);
 
     /* populate the pixel arrays with the corresponding face data for each high poly object */
     pixel_array_high = MEM_mallocN(sizeof(BakePixel) * targets.pixels_num,
@@ -1746,6 +1815,7 @@ static int bake_exec(bContext *C, wmOperator *op)
   }
 
   if (!bake_objects_check(bkr.main,
+                          bkr.scene,
                           bkr.view_layer,
                           bkr.ob,
                           &bkr.selected_objects,
@@ -1799,6 +1869,7 @@ static void bake_startjob(void *bkv, short *UNUSED(stop), short *do_update, floa
   }
 
   if (!bake_objects_check(bkr->main,
+                          bkr->scene,
                           bkr->view_layer,
                           bkr->ob,
                           &bkr->selected_objects,
diff --git a/source/blender/editors/object/object_collection.c b/source/blender/editors/object/object_collection.c
index 39951c2ab6e..53e1a75cba0 100644
--- a/source/blender/editors/object/object_collection.c
+++ b/source/blender/editors/object/object_collection.c
@@ -16,6 +16,7 @@
 
 #include "BKE_collection.h"
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_object.h"
@@ -202,7 +203,8 @@ static int objects_remove_active_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   int single_collection_index = RNA_enum_get(op->ptr, "collection");
   Collection *single_collection = collection_object_active_find_index(
       bmain, scene, ob, single_collection_index);
diff --git a/source/blender/editors/object/object_constraint.c b/source/blender/editors/object/object_constraint.c
index bf3b71178e8..3c3b66b4b1d 100644
--- a/source/blender/editors/object/object_constraint.c
+++ b/source/blender/editors/object/object_constraint.c
@@ -31,6 +31,7 @@
 #include "BKE_constraint.h"
 #include "BKE_context.h"
 #include "BKE_fcurve.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_object.h"
 #include "BKE_report.h"
@@ -50,6 +51,7 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 #include "RNA_enum_types.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "ED_keyframing.h"
@@ -295,10 +297,9 @@ static void test_constraint(
   if (con->type == CONSTRAINT_TYPE_KINEMATIC) {
     bKinematicConstraint *data = con->data;
 
-    /* bad: we need a separate set of checks here as poletarget is
-     * optional... otherwise poletarget must exist too or else
-     * the constraint is deemed invalid
-     */
+    /* Bad: we need a separate set of checks here as pole-target is optional...
+     * otherwise pole-target must exist too or else the constraint is deemed invalid. */
+
     /* default IK check ... */
     if (BKE_object_exists_check(bmain, data->tar) == 0) {
       data->tar = NULL;
@@ -2312,12 +2313,14 @@ static bool get_new_constraint_target(
   /* if still not found, add a new empty to act as a target (if allowed) */
   if ((found == false) && (add)) {
     Main *bmain = CTX_data_main(C);
+    Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Base *base = BASACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Base *base = BKE_view_layer_active_base_get(view_layer);
     Object *obt;
 
     /* add new target object */
-    obt = BKE_object_add(bmain, view_layer, OB_EMPTY, NULL);
+    obt = BKE_object_add(bmain, scene, view_layer, OB_EMPTY, NULL);
 
     /* transform cent to global coords for loc */
     if (pchanact) {
@@ -2335,7 +2338,7 @@ static bool get_new_constraint_target(
     }
 
     /* restore, BKE_object_add sets active */
-    BASACT(view_layer) = base;
+    view_layer->basact = base;
     ED_object_base_select(base, BA_SELECT);
 
     /* make our new target the new object */
diff --git a/source/blender/editors/object/object_data_transfer.c b/source/blender/editors/object/object_data_transfer.c
index 4837b538bf6..78b059d5514 100644
--- a/source/blender/editors/object/object_data_transfer.c
+++ b/source/blender/editors/object/object_data_transfer.c
@@ -45,7 +45,7 @@
  * Note some are 'fake' ones, i.e. they are not hold by real CDLayers. */
 /* Not shared with modifier, since we use a usual enum here, not a multi-choice one. */
 static const EnumPropertyItem DT_layer_items[] = {
-    RNA_ENUM_ITEM_HEADING("Vertex Data", NULL),
+    RNA_ENUM_ITEM_HEADING(N_("Vertex Data"), NULL),
     {DT_TYPE_MDEFORMVERT,
      "VGROUP_WEIGHTS",
      0,
@@ -61,7 +61,7 @@ static const EnumPropertyItem DT_layer_items[] = {
 #endif
     {DT_TYPE_BWEIGHT_VERT, "BEVEL_WEIGHT_VERT", 0, "Bevel Weight", "Transfer bevel weights"},
 
-    RNA_ENUM_ITEM_HEADING("Edge Data", NULL),
+    RNA_ENUM_ITEM_HEADING(N_("Edge Data"), NULL),
     {DT_TYPE_SHARP_EDGE, "SHARP_EDGE", 0, "Sharp", "Transfer sharp mark"},
     {DT_TYPE_SEAM, "SEAM", 0, "UV Seam", "Transfer UV seam mark"},
     {DT_TYPE_CREASE, "CREASE", 0, "Subdivision Crease", "Transfer crease values"},
@@ -72,12 +72,12 @@ static const EnumPropertyItem DT_layer_items[] = {
      "Freestyle Mark",
      "Transfer Freestyle edge mark"},
 
-    RNA_ENUM_ITEM_HEADING("Face Corner Data", NULL),
+    RNA_ENUM_ITEM_HEADING(N_("Face Corner Data"), NULL),
     {DT_TYPE_LNOR, "CUSTOM_NORMAL", 0, "Custom Normals", "Transfer custom normals"},
     {DT_TYPE_MPROPCOL_LOOP | DT_TYPE_MLOOPCOL_LOOP, "VCOL", 0, "Colors", "Color Attributes"},
     {DT_TYPE_UV, "UV", 0, "UVs", "Transfer UV layers"},
 
-    RNA_ENUM_ITEM_HEADING("Face Data", NULL),
+    RNA_ENUM_ITEM_HEADING(N_("Face Data"), NULL),
     {DT_TYPE_SHARP_FACE, "SMOOTH", 0, "Smooth", "Transfer flat/smooth mark"},
     {DT_TYPE_FREESTYLE_FACE,
      "FREESTYLE_FACE",
diff --git a/source/blender/editors/object/object_data_transform.c b/source/blender/editors/object/object_data_transform.c
index 63513eac965..cb66010c497 100644
--- a/source/blender/editors/object/object_data_transform.c
+++ b/source/blender/editors/object/object_data_transform.c
@@ -7,7 +7,7 @@
  * Use to transform object origins only.
  *
  * This is a small API to store & apply transformations to object data,
- * where a transformation matrix can be continually applied ontop of the original values
+ * where a transformation matrix can be continually applied on top of the original values
  * so we don't lose precision over time.
  */
 
diff --git a/source/blender/editors/object/object_edit.c b/source/blender/editors/object/object_edit.c
index e65b5a61299..c3482b13db6 100644
--- a/source/blender/editors/object/object_edit.c
+++ b/source/blender/editors/object/object_edit.c
@@ -140,8 +140,10 @@ Object **ED_object_array_in_mode_or_selected(bContext *C,
                                              uint *r_objects_len)
 {
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob_active = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob_active = BKE_view_layer_active_object_get(view_layer);
   ID *id_pin = NULL;
   const bool use_objects_in_mode = (ob_active != NULL) &&
                                    (ob_active->mode & (OB_MODE_EDIT | OB_MODE_POSE));
@@ -194,13 +196,13 @@ Object **ED_object_array_in_mode_or_selected(bContext *C,
     /* When in a mode that supports multiple active objects, use "objects in mode"
      * instead of the object's selection. */
     if (use_objects_in_mode) {
-      objects = BKE_view_layer_array_from_objects_in_mode(view_layer,
-                                                          v3d,
-                                                          r_objects_len,
-                                                          {.object_mode = ob_active->mode,
-                                                           .no_dup_data = true,
-                                                           .filter_fn = filter_fn,
-                                                           .filter_userdata = filter_user_data});
+      struct ObjectsInModeParams params = {0};
+      params.object_mode = ob_active->mode;
+      params.no_dup_data = true;
+      params.filter_fn = filter_fn;
+      params.filter_userdata = filter_user_data;
+      objects = BKE_view_layer_array_from_objects_in_mode_params(
+          scene, view_layer, v3d, r_objects_len, &params);
     }
     else {
       objects = BKE_view_layer_array_selected_objects(
@@ -234,7 +236,8 @@ static int object_hide_view_clear_exec(bContext *C, wmOperator *op)
   const bool select = RNA_boolean_get(op->ptr, "select");
   bool changed = false;
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->flag & BASE_HIDDEN) {
       base->flag &= ~BASE_HIDDEN;
       changed = true;
@@ -252,7 +255,7 @@ static int object_hide_view_clear_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_VISIBLE, scene);
@@ -286,8 +289,9 @@ static int object_hide_view_set_exec(bContext *C, wmOperator *op)
   bool changed = false;
 
   /* Hide selected or unselected objects. */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
-    if (!(base->flag & BASE_VISIBLE_VIEWLAYER)) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
+    if (!(base->flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT)) {
       continue;
     }
 
@@ -310,7 +314,7 @@ static int object_hide_view_set_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_VISIBLE, scene);
@@ -362,10 +366,10 @@ static int object_hide_collection_exec(bContext *C, wmOperator *op)
     }
     if (toggle) {
       lc->local_collections_bits ^= v3d->local_collections_uuid;
-      BKE_layer_collection_local_sync(view_layer, v3d);
+      BKE_layer_collection_local_sync(scene, view_layer, v3d);
     }
     else {
-      BKE_layer_collection_isolate_local(view_layer, v3d, lc, extend);
+      BKE_layer_collection_isolate_local(scene, view_layer, v3d, lc, extend);
     }
   }
   else {
@@ -381,6 +385,7 @@ static int object_hide_collection_exec(bContext *C, wmOperator *op)
 
 void ED_collection_hide_menu_draw(const bContext *C, uiLayout *layout)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   LayerCollection *lc_scene = view_layer->layer_collections.first;
 
@@ -399,7 +404,7 @@ void ED_collection_hide_menu_draw(const bContext *C, uiLayout *layout)
     }
 
     int icon = ICON_NONE;
-    if (BKE_layer_collection_has_selected_objects(view_layer, lc)) {
+    if (BKE_layer_collection_has_selected_objects(scene, view_layer, lc)) {
       icon = ICON_LAYER_ACTIVE;
     }
     else if (lc->runtime_flag & LAYER_COLLECTION_HAS_OBJECTS) {
@@ -701,14 +706,16 @@ bool ED_object_editmode_free_ex(Main *bmain, Object *obedit)
 
 bool ED_object_editmode_exit_multi_ex(Main *bmain, Scene *scene, ViewLayer *view_layer, int flag)
 {
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit == NULL) {
     return false;
   }
   bool changed = false;
   const short obedit_type = obedit->type;
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     Object *ob = base->object;
     if ((ob->type == obedit_type) && (ob->mode & OB_MODE_EDIT)) {
       changed |= ED_object_editmode_exit_ex(bmain, scene, base->object, flag);
@@ -841,7 +848,8 @@ static int editmode_toggle_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   View3D *v3d = CTX_wm_view3d(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   const int mode_flag = OB_MODE_EDIT;
   const bool is_mode_set = (obact->mode & mode_flag) != 0;
   struct wmMsgBus *mbus = CTX_wm_message_bus(C);
@@ -867,7 +875,7 @@ static int editmode_toggle_exec(bContext *C, wmOperator *op)
     ED_object_editmode_exit_ex(bmain, scene, obact, EM_FREEDATA);
 
     if ((obact->mode & mode_flag) == 0) {
-      FOREACH_OBJECT_BEGIN (view_layer, ob) {
+      FOREACH_OBJECT_BEGIN (scene, view_layer, ob) {
         if ((ob != obact) && (ob->type == obact->type)) {
           ED_object_editmode_exit_ex(bmain, scene, ob, EM_FREEDATA);
         }
@@ -889,13 +897,13 @@ static bool editmode_toggle_poll(bContext *C)
 {
   Object *ob = CTX_data_active_object(C);
 
-  /* covers proxies too */
+  /* Covers liboverrides too. */
   if (ELEM(NULL, ob, ob->data) || ID_IS_LINKED(ob->data) || ID_IS_OVERRIDE_LIBRARY(ob) ||
       ID_IS_OVERRIDE_LIBRARY(ob->data)) {
     return false;
   }
 
-  /* if hidden but in edit mode, we still display */
+  /* If hidden but in edit mode, we still display. */
   if ((ob->visibility_flag & OB_HIDE_VIEWPORT) && !(ob->mode & OB_MODE_EDIT)) {
     return false;
   }
@@ -953,7 +961,8 @@ static int posemode_exec(bContext *C, wmOperator *op)
   }
 
   {
-    Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obedit = BKE_view_layer_edit_object_get(view_layer);
     if (obact == obedit) {
       ED_object_editmode_exit_ex(bmain, scene, obedit, EM_FREEDATA);
       is_mode_set = false;
@@ -963,7 +972,7 @@ static int posemode_exec(bContext *C, wmOperator *op)
   if (is_mode_set) {
     bool ok = ED_object_posemode_exit(C, obact);
     if (ok) {
-      FOREACH_OBJECT_BEGIN (view_layer, ob) {
+      FOREACH_OBJECT_BEGIN (scene, view_layer, ob) {
         if ((ob != obact) && (ob->type == OB_ARMATURE) && (ob->mode & mode_flag)) {
           ED_object_posemode_exit_ex(bmain, ob);
         }
@@ -1469,8 +1478,6 @@ void OBJECT_OT_paths_clear(wmOperatorType *ot)
 static int shade_smooth_exec(bContext *C, wmOperator *op)
 {
   const bool use_smooth = STREQ(op->idname, "OBJECT_OT_shade_smooth");
-  const bool use_auto_smooth = RNA_boolean_get(op->ptr, "use_auto_smooth");
-  const float auto_smooth_angle = RNA_float_get(op->ptr, "auto_smooth_angle");
   bool changed_multi = false;
   bool has_linked_data = false;
 
@@ -1479,8 +1486,10 @@ static int shade_smooth_exec(bContext *C, wmOperator *op)
 
   /* For modes that only use an active object, don't handle the whole selection. */
   {
+    Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Object *obact = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obact = BKE_view_layer_active_object_get(view_layer);
     if (obact && ((obact->mode & OB_MODE_ALL_PAINT))) {
       ctx_ob_single_active.ptr.data = obact;
       BLI_addtail(&ctx_objects, &ctx_ob_single_active);
@@ -1518,7 +1527,11 @@ static int shade_smooth_exec(bContext *C, wmOperator *op)
     bool changed = false;
     if (ob->type == OB_MESH) {
       BKE_mesh_smooth_flag_set(ob->data, use_smooth);
-      BKE_mesh_auto_smooth_flag_set(ob->data, use_auto_smooth, auto_smooth_angle);
+      if (use_smooth) {
+        const bool use_auto_smooth = RNA_boolean_get(op->ptr, "use_auto_smooth");
+        const float auto_smooth_angle = RNA_float_get(op->ptr, "auto_smooth_angle");
+        BKE_mesh_auto_smooth_flag_set(ob->data, use_auto_smooth, auto_smooth_angle);
+      }
       BKE_mesh_batch_cache_dirty_tag(ob->data, BKE_MESH_BATCH_DIRTY_ALL);
       changed = true;
     }
@@ -1548,8 +1561,10 @@ static int shade_smooth_exec(bContext *C, wmOperator *op)
 
 static bool shade_poll(bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact != NULL) {
     /* Doesn't handle edit-data, sculpt dynamic-topology, or their undo systems. */
     if (obact->mode & (OB_MODE_EDIT | OB_MODE_SCULPT) || obact->data == NULL ||
diff --git a/source/blender/editors/object/object_facemap_ops.c b/source/blender/editors/object/object_facemap_ops.c
index dddf5e40e87..4364375a4e3 100644
--- a/source/blender/editors/object/object_facemap_ops.c
+++ b/source/blender/editors/object/object_facemap_ops.c
@@ -53,7 +53,7 @@ void ED_object_facemap_face_add(Object *ob, bFaceMap *fmap, int facenum)
 
     /* if there's is no facemap layer then create one */
     if ((facemap = CustomData_get_layer(&me->pdata, CD_FACEMAP)) == NULL) {
-      facemap = CustomData_add_layer(&me->pdata, CD_FACEMAP, CD_DEFAULT, NULL, me->totpoly);
+      facemap = CustomData_add_layer(&me->pdata, CD_FACEMAP, CD_SET_DEFAULT, NULL, me->totpoly);
     }
 
     facemap[facenum] = fmap_nr;
diff --git a/source/blender/editors/object/object_gpencil_modifier.c b/source/blender/editors/object/object_gpencil_modifier.c
index 573f048e6b6..42ac6d166b4 100644
--- a/source/blender/editors/object/object_gpencil_modifier.c
+++ b/source/blender/editors/object/object_gpencil_modifier.c
@@ -680,8 +680,7 @@ static int gpencil_modifier_move_to_index_exec(bContext *C, wmOperator *op)
   Object *ob = ED_object_active_context(C);
   GpencilModifierData *md = gpencil_edit_modifier_property_get(op, ob, 0);
   int index = RNA_int_get(op->ptr, "index");
-
-  if (!ED_object_gpencil_modifier_move_to_index(op->reports, ob, md, index)) {
+  if (!(md && ED_object_gpencil_modifier_move_to_index(op->reports, ob, md, index))) {
     return OPERATOR_CANCELLED;
   }
 
diff --git a/source/blender/editors/object/object_hook.c b/source/blender/editors/object/object_hook.c
index b3f62f3fc0f..27659042f50 100644
--- a/source/blender/editors/object/object_hook.c
+++ b/source/blender/editors/object/object_hook.c
@@ -484,22 +484,22 @@ static bool hook_op_edit_poll(bContext *C)
   return false;
 }
 
-static Object *add_hook_object_new(Main *bmain, ViewLayer *view_layer, View3D *v3d, Object *obedit)
+static Object *add_hook_object_new(
+    Main *bmain, Scene *scene, ViewLayer *view_layer, View3D *v3d, Object *obedit)
 {
   Base *basedit;
   Object *ob;
-
-  ob = BKE_object_add(bmain, view_layer, OB_EMPTY, NULL);
-
-  basedit = BKE_view_layer_base_find(view_layer, obedit);
-  BLI_assert(view_layer->basact->object == ob);
-
+  ob = BKE_object_add(bmain, scene, view_layer, OB_EMPTY, NULL);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *basact = BKE_view_layer_active_base_get(view_layer);
+  BLI_assert(basact->object == ob);
   if (v3d && v3d->localvd) {
-    view_layer->basact->local_view_bits |= v3d->local_view_uuid;
+    basact->local_view_bits |= v3d->local_view_uuid;
   }
 
   /* icky, BKE_object_add sets new base as active.
    * so set it back to the original edit object */
+  basedit = BKE_view_layer_base_find(view_layer, obedit);
   view_layer->basact = basedit;
 
   return ob;
@@ -532,7 +532,7 @@ static int add_hook_object(const bContext *C,
 
   if (mode == OBJECT_ADDHOOK_NEWOB && !ob) {
 
-    ob = add_hook_object_new(bmain, view_layer, v3d, obedit);
+    ob = add_hook_object_new(bmain, scene, view_layer, v3d, obedit);
 
     /* transform cent to global coords for loc */
     mul_v3_m4v3(ob->loc, obedit->obmat, cent);
diff --git a/source/blender/editors/object/object_intern.h b/source/blender/editors/object/object_intern.h
index b5862d4d957..63f010cd526 100644
--- a/source/blender/editors/object/object_intern.h
+++ b/source/blender/editors/object/object_intern.h
@@ -49,10 +49,14 @@ void OBJECT_OT_vertex_parent_set(struct wmOperatorType *ot);
 void OBJECT_OT_track_set(struct wmOperatorType *ot);
 void OBJECT_OT_track_clear(struct wmOperatorType *ot);
 void OBJECT_OT_make_local(struct wmOperatorType *ot);
-void OBJECT_OT_make_override_library(struct wmOperatorType *ot);
 void OBJECT_OT_make_single_user(struct wmOperatorType *ot);
 void OBJECT_OT_make_links_scene(struct wmOperatorType *ot);
 void OBJECT_OT_make_links_data(struct wmOperatorType *ot);
+
+void OBJECT_OT_make_override_library(struct wmOperatorType *ot);
+void OBJECT_OT_reset_override_library(struct wmOperatorType *ot);
+void OBJECT_OT_clear_override_library(struct wmOperatorType *ot);
+
 /**
  * Used for drop-box.
  * Assigns to object under cursor, only first material slot.
@@ -259,7 +263,7 @@ void CONSTRAINT_OT_objectsolver_set_inverse(struct wmOperatorType *ot);
 void CONSTRAINT_OT_objectsolver_clear_inverse(struct wmOperatorType *ot);
 void CONSTRAINT_OT_followpath_path_animate(struct wmOperatorType *ot);
 
-/* object_vgroup.c */
+/* object_vgroup.cc */
 
 void OBJECT_OT_vertex_group_add(struct wmOperatorType *ot);
 void OBJECT_OT_vertex_group_remove(struct wmOperatorType *ot);
diff --git a/source/blender/editors/object/object_modes.c b/source/blender/editors/object/object_modes.c
index 0055cdf9ea1..6525f2d6027 100644
--- a/source/blender/editors/object/object_modes.c
+++ b/source/blender/editors/object/object_modes.c
@@ -190,8 +190,11 @@ bool ED_object_mode_compat_set(bContext *C, Object *ob, eObjectMode mode, Report
 bool ED_object_mode_set_ex(bContext *C, eObjectMode mode, bool use_undo, ReportList *reports)
 {
   wmWindowManager *wm = CTX_wm_manager(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   if (ob == NULL) {
     return (mode == OB_MODE_OBJECT);
   }
@@ -327,9 +330,11 @@ static void ed_object_posemode_set_for_weight_paint_ex(bContext *C,
                                                        const bool is_mode_set)
 {
   View3D *v3d = CTX_wm_view3d(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   if (ob_arm != NULL) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
     const Base *base_arm = BKE_view_layer_base_find(view_layer, ob_arm);
     if (base_arm && BASE_VISIBLE(v3d, base_arm)) {
       if (is_mode_set) {
@@ -464,8 +469,9 @@ static bool object_transfer_mode_to_base(bContext *C, wmOperator *op, Base *base
 
   if (ED_object_mode_set_ex(C, OB_MODE_OBJECT, true, op->reports)) {
     Object *ob_dst_orig = DEG_get_original_object(ob_dst);
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base = BKE_view_layer_base_find(view_layer, ob_dst_orig);
-    BKE_view_layer_base_deselect_all(view_layer);
+    BKE_view_layer_base_deselect_all(scene, view_layer);
     BKE_view_layer_base_select_and_set_active(view_layer, base);
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
 
diff --git a/source/blender/editors/object/object_modifier.cc b/source/blender/editors/object/object_modifier.cc
index 69edd00ae24..f82c0938b51 100644
--- a/source/blender/editors/object/object_modifier.cc
+++ b/source/blender/editors/object/object_modifier.cc
@@ -47,9 +47,11 @@
 #include "BKE_gpencil_modifier.h"
 #include "BKE_key.h"
 #include "BKE_lattice.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_material.h"
+#include "BKE_mball.h"
 #include "BKE_mesh.h"
 #include "BKE_mesh_mapping.h"
 #include "BKE_mesh_runtime.h"
@@ -92,6 +94,8 @@
 
 #include "object_intern.h"
 
+using blender::Span;
+
 static void modifier_skin_customdata_delete(struct Object *ob);
 
 /* ------------------------------------------------------------------- */
@@ -111,7 +115,7 @@ static void object_force_modifier_update_for_bind(Depsgraph *depsgraph, Object *
     BKE_lattice_modifiers_calc(depsgraph, scene_eval, ob_eval);
   }
   else if (ob->type == OB_MBALL) {
-    BKE_displist_make_mball(depsgraph, scene_eval, ob_eval);
+    BKE_mball_data_update(depsgraph, scene_eval, ob_eval);
   }
   else if (ELEM(ob->type, OB_CURVES_LEGACY, OB_SURF, OB_FONT)) {
     BKE_displist_make_curveTypes(depsgraph, scene_eval, ob_eval, false);
@@ -486,6 +490,9 @@ bool ED_object_modifier_move_to_index(ReportList *reports,
     }
   }
 
+  /* NOTE: Dependency graph only uses modifier nodes for visibility updates, and exact order of
+   * modifier nodes in the graph does not matter. */
+
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
   WM_main_add_notifier(NC_OBJECT | ND_MODIFIER, ob);
 
@@ -518,6 +525,7 @@ void ED_object_modifier_copy_to_object(bContext *C,
 bool ED_object_modifier_convert_psys_to_mesh(ReportList *UNUSED(reports),
                                              Main *bmain,
                                              Depsgraph *depsgraph,
+                                             Scene *scene,
                                              ViewLayer *view_layer,
                                              Object *ob,
                                              ModifierData *md)
@@ -576,18 +584,20 @@ bool ED_object_modifier_convert_psys_to_mesh(ReportList *UNUSED(reports),
   }
 
   /* add new mesh */
-  Object *obn = BKE_object_add(bmain, view_layer, OB_MESH, nullptr);
+  Object *obn = BKE_object_add(bmain, scene, view_layer, OB_MESH, nullptr);
   Mesh *me = static_cast<Mesh *>(obn->data);
 
   me->totvert = verts_num;
   me->totedge = edges_num;
 
-  me->mvert = (MVert *)CustomData_add_layer(&me->vdata, CD_MVERT, CD_CALLOC, nullptr, verts_num);
-  me->medge = (MEdge *)CustomData_add_layer(&me->edata, CD_MEDGE, CD_CALLOC, nullptr, edges_num);
-  me->mface = (MFace *)CustomData_add_layer(&me->fdata, CD_MFACE, CD_CALLOC, nullptr, 0);
+  CustomData_add_layer(&me->vdata, CD_MVERT, CD_SET_DEFAULT, nullptr, verts_num);
+  CustomData_add_layer(&me->edata, CD_MEDGE, CD_SET_DEFAULT, nullptr, edges_num);
+  CustomData_add_layer(&me->fdata, CD_MFACE, CD_SET_DEFAULT, nullptr, 0);
 
-  MVert *mvert = me->mvert;
-  MEdge *medge = me->medge;
+  blender::MutableSpan<MVert> verts = me->verts_for_write();
+  blender::MutableSpan<MEdge> edges = me->edges_for_write();
+  MVert *mvert = verts.data();
+  MEdge *medge = edges.data();
 
   /* copy coordinates */
   cache = psys_eval->pathcache;
@@ -754,10 +764,10 @@ static bool modifier_apply_obdata(
 
       Main *bmain = DEG_get_bmain(depsgraph);
       BKE_object_material_from_eval_data(bmain, ob, &mesh_applied->id);
-      BKE_mesh_nomain_to_mesh(mesh_applied, me, ob, &CD_MASK_MESH, true);
+      BKE_mesh_nomain_to_mesh(mesh_applied, me, ob);
 
       /* Anonymous attributes shouldn't be available on the applied geometry. */
-      blender::bke::mesh_attributes_for_write(*me).remove_anonymous();
+      me->attributes_for_write().remove_anonymous();
 
       if (md_eval->type == eModifierType_Multires) {
         multires_customdata_delete(me);
@@ -818,7 +828,7 @@ static bool modifier_apply_obdata(
     /* Create a temporary geometry set and component. */
     GeometrySet geometry_set;
     geometry_set.get_component_for_write<CurveComponent>().replace(
-        &curves, GeometryOwnershipType::Editable);
+        &curves, GeometryOwnershipType::ReadOnly);
 
     ModifierEvalContext mectx = {depsgraph, ob, (ModifierApplyFlag)0};
     mti->modifyGeometrySet(md_eval, &mectx, &geometry_set);
@@ -833,14 +843,11 @@ static bool modifier_apply_obdata(
         .attributes_for_write()
         .remove_anonymous();
 
-    /* If the modifier's output is a different curves data-block, copy the relevant information to
-     * the original. */
-    if (&curves_eval != &curves) {
-      blender::bke::CurvesGeometry::wrap(curves.geometry) = std::move(
-          blender::bke::CurvesGeometry::wrap(curves_eval.geometry));
-      Main *bmain = DEG_get_bmain(depsgraph);
-      BKE_object_material_from_eval_data(bmain, ob, &curves_eval.id);
-    }
+    /* Copy the relevant information to the original. */
+    blender::bke::CurvesGeometry::wrap(curves.geometry) = std::move(
+        blender::bke::CurvesGeometry::wrap(curves_eval.geometry));
+    Main *bmain = DEG_get_bmain(depsgraph);
+    BKE_object_material_from_eval_data(bmain, ob, &curves_eval.id);
   }
   else {
     /* TODO: implement for point clouds and volumes. */
@@ -1226,7 +1233,8 @@ static int modifier_remove_exec(bContext *C, wmOperator *op)
   /* if cloth/softbody was removed, particle mode could be cleared */
   if (mode_orig & OB_MODE_PARTICLE_EDIT) {
     if ((ob->mode & OB_MODE_PARTICLE_EDIT) == 0) {
-      if (ob == OBACT(view_layer)) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      if (ob == BKE_view_layer_active_object_get(view_layer)) {
         WM_event_add_notifier(C, NC_SCENE | ND_MODE | NS_MODE_OBJECT, nullptr);
       }
     }
@@ -1366,7 +1374,7 @@ static int modifier_move_to_index_exec(bContext *C, wmOperator *op)
   ModifierData *md = edit_modifier_property_get(op, ob, 0);
   int index = RNA_int_get(op->ptr, "index");
 
-  if (!ED_object_modifier_move_to_index(op->reports, ob, md, index)) {
+  if (!(md && ED_object_modifier_move_to_index(op->reports, ob, md, index))) {
     return OPERATOR_CANCELLED;
   }
 
@@ -1439,7 +1447,6 @@ static int modifier_apply_exec_ex(bContext *C, wmOperator *op, int apply_as, boo
   Scene *scene = CTX_data_scene(C);
   Object *ob = ED_object_active_context(C);
   ModifierData *md = edit_modifier_property_get(op, ob, 0);
-  const ModifierTypeInfo *mti = BKE_modifier_get_info((ModifierType)md->type);
   const bool do_report = RNA_boolean_get(op->ptr, "report");
   const bool do_single_user = RNA_boolean_get(op->ptr, "single_user");
   const bool do_merge_customdata = RNA_boolean_get(op->ptr, "merge_customdata");
@@ -1448,6 +1455,8 @@ static int modifier_apply_exec_ex(bContext *C, wmOperator *op, int apply_as, boo
     return OPERATOR_CANCELLED;
   }
 
+  const ModifierTypeInfo *mti = BKE_modifier_get_info((ModifierType)md->type);
+
   if (do_single_user && ID_REAL_USERS(ob->data) > 1) {
     ED_object_single_obdata_user(bmain, scene, ob);
     BKE_main_id_newptr_and_tag_clear(bmain);
@@ -1547,7 +1556,7 @@ void OBJECT_OT_modifier_apply(wmOperatorType *ot)
 /** \} */
 
 /* ------------------------------------------------------------------- */
-/** \name Apply Modifier As Shapekey Operator
+/** \name Apply Modifier As Shape-Key Operator
  * \{ */
 
 static bool modifier_apply_as_shapekey_poll(bContext *C)
@@ -1614,12 +1623,13 @@ static int modifier_convert_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob = ED_object_active_context(C);
   ModifierData *md = edit_modifier_property_get(op, ob, 0);
 
   if (!md || !ED_object_modifier_convert_psys_to_mesh(
-                 op->reports, bmain, depsgraph, view_layer, ob, md)) {
+                 op->reports, bmain, depsgraph, scene, view_layer, ob, md)) {
     return OPERATOR_CANCELLED;
   }
 
@@ -1670,6 +1680,7 @@ static int modifier_copy_exec(bContext *C, wmOperator *op)
   }
 
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
+  DEG_relations_tag_update(bmain);
   WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, ob);
 
   return OPERATOR_FINISHED;
@@ -2585,8 +2596,8 @@ void OBJECT_OT_skin_radii_equalize(wmOperatorType *ot)
 }
 
 static void skin_armature_bone_create(Object *skin_ob,
-                                      MVert *mvert,
-                                      MEdge *medge,
+                                      const MVert *mvert,
+                                      const MEdge *medge,
                                       bArmature *arm,
                                       BLI_bitmap *edges_visited,
                                       const MeshElemMap *emap,
@@ -2631,18 +2642,22 @@ static void skin_armature_bone_create(Object *skin_ob,
 static Object *modifier_skin_armature_create(Depsgraph *depsgraph, Main *bmain, Object *skin_ob)
 {
   Mesh *me = static_cast<Mesh *>(skin_ob->data);
+  const Span<MVert> me_verts = me->verts();
+  const Span<MEdge> me_edges = me->edges();
 
   Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
   Object *ob_eval = DEG_get_evaluated_object(depsgraph, skin_ob);
 
-  Mesh *me_eval_deform = mesh_get_eval_deform(depsgraph, scene_eval, ob_eval, &CD_MASK_BAREMESH);
-  MVert *mvert = me_eval_deform->mvert;
+  const Mesh *me_eval_deform = mesh_get_eval_deform(
+      depsgraph, scene_eval, ob_eval, &CD_MASK_BAREMESH);
+  const Span<MVert> verts_eval = me_eval_deform->verts();
 
   /* add vertex weights to original mesh */
-  CustomData_add_layer(&me->vdata, CD_MDEFORMVERT, CD_CALLOC, nullptr, me->totvert);
+  CustomData_add_layer(&me->vdata, CD_MDEFORMVERT, CD_SET_DEFAULT, nullptr, me->totvert);
 
+  Scene *scene = DEG_get_input_scene(depsgraph);
   ViewLayer *view_layer = DEG_get_input_view_layer(depsgraph);
-  Object *arm_ob = BKE_object_add(bmain, view_layer, OB_ARMATURE, nullptr);
+  Object *arm_ob = BKE_object_add(bmain, scene, view_layer, OB_ARMATURE, nullptr);
   BKE_object_transform_copy(arm_ob, skin_ob);
   bArmature *arm = static_cast<bArmature *>(arm_ob->data);
   arm->layer = 1;
@@ -2654,7 +2669,7 @@ static Object *modifier_skin_armature_create(Depsgraph *depsgraph, Main *bmain,
       CustomData_get_layer(&me->vdata, CD_MVERT_SKIN));
   int *emap_mem;
   MeshElemMap *emap;
-  BKE_mesh_vert_edge_map_create(&emap, &emap_mem, me->medge, me->totvert, me->totedge);
+  BKE_mesh_vert_edge_map_create(&emap, &emap_mem, me_edges.data(), me->totvert, me->totedge);
 
   BLI_bitmap *edges_visited = BLI_BITMAP_NEW(me->totedge, "edge_visited");
 
@@ -2670,15 +2685,16 @@ static Object *modifier_skin_armature_create(Depsgraph *depsgraph, Main *bmain,
       if (emap[v].count > 1) {
         bone = ED_armature_ebone_add(arm, "Bone");
 
-        copy_v3_v3(bone->head, me->mvert[v].co);
-        copy_v3_v3(bone->tail, me->mvert[v].co);
+        copy_v3_v3(bone->head, me_verts[v].co);
+        copy_v3_v3(bone->tail, me_verts[v].co);
 
         bone->head[1] = 1.0f;
         bone->rad_head = bone->rad_tail = 0.25;
       }
 
       if (emap[v].count >= 1) {
-        skin_armature_bone_create(skin_ob, mvert, me->medge, arm, edges_visited, emap, bone, v);
+        skin_armature_bone_create(
+            skin_ob, verts_eval.data(), me_edges.data(), arm, edges_visited, emap, bone, v);
       }
     }
   }
@@ -3346,6 +3362,7 @@ void OBJECT_OT_geometry_nodes_input_attribute_toggle(wmOperatorType *ot)
   ot->idname = "OBJECT_OT_geometry_nodes_input_attribute_toggle";
 
   ot->exec = geometry_nodes_input_attribute_toggle_exec;
+  ot->poll = ED_operator_object_active;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_INTERNAL;
 
@@ -3363,9 +3380,8 @@ static int geometry_node_tree_copy_assign_exec(bContext *C, wmOperator *UNUSED(o
 {
   Main *bmain = CTX_data_main(C);
   Object *ob = ED_object_active_context(C);
-
   ModifierData *md = BKE_object_active_modifier(ob);
-  if (md->type != eModifierType_Nodes) {
+  if (!(md && md->type == eModifierType_Nodes)) {
     return OPERATOR_CANCELLED;
   }
 
@@ -3385,6 +3401,7 @@ static int geometry_node_tree_copy_assign_exec(bContext *C, wmOperator *UNUSED(o
   nmd->node_group = new_tree;
   id_us_min(&tree->id);
 
+  DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
   DEG_relations_tag_update(bmain);
   WM_event_add_notifier(C, NC_OBJECT | ND_MODIFIER, ob);
   return OPERATOR_FINISHED;
@@ -3397,6 +3414,7 @@ void OBJECT_OT_geometry_node_tree_copy_assign(wmOperatorType *ot)
   ot->idname = "OBJECT_OT_geometry_node_tree_copy_assign";
 
   ot->exec = geometry_node_tree_copy_assign_exec;
+  ot->poll = ED_operator_object_active;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 }
diff --git a/source/blender/editors/object/object_ops.c b/source/blender/editors/object/object_ops.c
index 8a0d380ff2f..24a4556b075 100644
--- a/source/blender/editors/object/object_ops.c
+++ b/source/blender/editors/object/object_ops.c
@@ -58,11 +58,14 @@ void ED_operatortypes_object(void)
   WM_operatortype_append(OBJECT_OT_track_set);
   WM_operatortype_append(OBJECT_OT_track_clear);
   WM_operatortype_append(OBJECT_OT_make_local);
-  WM_operatortype_append(OBJECT_OT_make_override_library);
   WM_operatortype_append(OBJECT_OT_make_single_user);
   WM_operatortype_append(OBJECT_OT_make_links_scene);
   WM_operatortype_append(OBJECT_OT_make_links_data);
 
+  WM_operatortype_append(OBJECT_OT_make_override_library);
+  WM_operatortype_append(OBJECT_OT_reset_override_library);
+  WM_operatortype_append(OBJECT_OT_clear_override_library);
+
   WM_operatortype_append(OBJECT_OT_select_random);
   WM_operatortype_append(OBJECT_OT_select_all);
   WM_operatortype_append(OBJECT_OT_select_same_collection);
diff --git a/source/blender/editors/object/object_random.c b/source/blender/editors/object/object_random.c
index 7d670d3f452..3117cbb0166 100644
--- a/source/blender/editors/object/object_random.c
+++ b/source/blender/editors/object/object_random.c
@@ -9,6 +9,7 @@
 
 #include "DNA_layer_types.h"
 #include "DNA_object_types.h"
+#include "DNA_scene_types.h"
 
 #include "BLI_math.h"
 #include "BLI_rand.h"
@@ -77,6 +78,7 @@ static bool object_rand_transverts(TransVertStore *tvs,
 
 static int object_rand_verts_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob_active = CTX_data_edit_object(C);
   const int ob_mode = ob_active->mode;
@@ -89,7 +91,7 @@ static int object_rand_verts_exec(bContext *C, wmOperator *op)
   bool changed_multi = false;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len, ob_mode);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len, ob_mode);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob_iter = objects[ob_index];
 
diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index 01042824aac..4a523997473 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -262,8 +262,8 @@ static int vertex_parent_set_exec(bContext *C, wmOperator *op)
       }
       else {
         Object workob;
-
-        ob->parent = BASACT(view_layer)->object;
+        BKE_view_layer_synced_ensure(scene, view_layer);
+        ob->parent = BKE_view_layer_active_object_get(view_layer);
         if (par3 != INDEX_UNSET) {
           ob->partype = PARVERT3;
           ob->par1 = par1;
@@ -1830,6 +1830,11 @@ static void single_obdata_users(
         DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
 
         switch (ob->type) {
+          case OB_EMPTY:
+            ob->data = ID_NEW_SET(
+                ob->data,
+                BKE_id_copy_ex(bmain, ob->data, NULL, LIB_ID_COPY_DEFAULT | LIB_ID_COPY_ACTIONS));
+            break;
           case OB_LAMP:
             ob->data = la = ID_NEW_SET(
                 ob->data,
@@ -2068,6 +2073,7 @@ static void tag_localizable_objects(bContext *C, const int mode)
  * otherwise they're lost on reload, see T40595.
  */
 static bool make_local_all__instance_indirect_unused(Main *bmain,
+                                                     const Scene *scene,
                                                      ViewLayer *view_layer,
                                                      Collection *collection)
 {
@@ -2081,6 +2087,7 @@ static bool make_local_all__instance_indirect_unused(Main *bmain,
       id_us_plus(&ob->id);
 
       BKE_collection_object_add(bmain, collection, ob);
+      BKE_view_layer_synced_ensure(scene, view_layer);
       base = BKE_view_layer_base_find(view_layer, ob);
       ED_object_base_select(base, BA_SELECT);
       DEG_id_tag_update(&ob->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
@@ -2148,15 +2155,16 @@ static int make_local_exec(bContext *C, wmOperator *op)
 
   /* NOTE: we (ab)use LIB_TAG_PRE_EXISTING to cherry pick which ID to make local... */
   if (mode == MAKE_LOCAL_ALL) {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     Collection *collection = CTX_data_collection(C);
 
     BKE_main_id_tag_all(bmain, LIB_TAG_PRE_EXISTING, false);
 
     /* De-select so the user can differentiate newly instanced from existing objects. */
-    BKE_view_layer_base_deselect_all(view_layer);
+    BKE_view_layer_base_deselect_all(scene, view_layer);
 
-    if (make_local_all__instance_indirect_unused(bmain, view_layer, collection)) {
+    if (make_local_all__instance_indirect_unused(bmain, scene, view_layer, collection)) {
       BKE_report(op->reports,
                  RPT_INFO,
                  "Orphan library objects added to the current scene to avoid loss");
@@ -2275,12 +2283,6 @@ static int make_override_library_exec(bContext *C, wmOperator *op)
   ID *id_root = NULL;
   bool is_override_instancing_object = false;
 
-  const bool do_fully_editable = U.experimental.use_override_new_fully_editable;
-
-  GSet *user_overrides_objects_uids = do_fully_editable ? NULL :
-                                                          BLI_gset_new(BLI_ghashutil_inthash_p,
-                                                                       BLI_ghashutil_intcmp,
-                                                                       __func__);
   bool user_overrides_from_selected_objects = false;
 
   if (!ID_IS_LINKED(obact) && obact->instance_collection != NULL &&
@@ -2320,6 +2322,21 @@ static int make_override_library_exec(bContext *C, wmOperator *op)
     user_overrides_from_selected_objects = true;
   }
 
+  const bool do_fully_editable = !user_overrides_from_selected_objects;
+
+  GSet *user_overrides_objects_uids = do_fully_editable ? NULL :
+                                                          BLI_gset_new(BLI_ghashutil_inthash_p,
+                                                                       BLI_ghashutil_intcmp,
+                                                                       __func__);
+
+  /* Make already existing selected liboverrides editable. */
+  FOREACH_SELECTED_OBJECT_BEGIN (view_layer, CTX_wm_view3d(C), ob_iter) {
+    if (ID_IS_OVERRIDE_LIBRARY_REAL(ob_iter) && !ID_IS_LINKED(ob_iter)) {
+      ob_iter->id.override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
+    }
+  }
+  FOREACH_SELECTED_OBJECT_END;
+
   if (do_fully_editable) {
     /* Pass. */
   }
@@ -2342,6 +2359,25 @@ static int make_override_library_exec(bContext *C, wmOperator *op)
 
   BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
 
+  /* For the time being, replace selected linked objects by their overrides in all collections.
+   * While this may not be the absolute best behavior in all cases, in most common one this should
+   * match the expected result. */
+  if (user_overrides_objects_uids != NULL) {
+    LISTBASE_FOREACH (Collection *, coll_iter, &bmain->collections) {
+      if (ID_IS_LINKED(coll_iter)) {
+        continue;
+      }
+      LISTBASE_FOREACH (CollectionObject *, coll_ob_iter, &coll_iter->gobject) {
+        if (BLI_gset_haskey(user_overrides_objects_uids,
+                            POINTER_FROM_UINT(coll_ob_iter->ob->id.session_uuid))) {
+          /* Tag for remapping when creating overrides. */
+          coll_iter->id.tag |= LIB_TAG_DOIT;
+          break;
+        }
+      }
+    }
+  }
+
   ID *id_root_override;
   const bool success = BKE_lib_override_library_create(bmain,
                                                        scene,
@@ -2406,6 +2442,8 @@ static int make_override_library_exec(bContext *C, wmOperator *op)
 
   DEG_id_tag_update(&CTX_data_scene(C)->id, ID_RECALC_BASE_FLAGS | ID_RECALC_COPY_ON_WRITE);
   WM_event_add_notifier(C, NC_WINDOW, NULL);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, NULL);
 
   return success ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
 }
@@ -2430,6 +2468,9 @@ static int make_override_library_invoke(bContext *C, wmOperator *op, const wmEve
   }
 
   if (!ID_IS_LINKED(obact)) {
+    if (ID_IS_OVERRIDE_LIBRARY_REAL(obact)) {
+      return make_override_library_exec(C, op);
+    }
     BKE_report(op->reports, RPT_ERROR, "Cannot make library override from a local object");
     return OPERATOR_CANCELLED;
   }
@@ -2468,17 +2509,20 @@ static bool make_override_library_poll(bContext *C)
   Object *obact = CTX_data_active_object(C);
 
   /* Object must be directly linked to be overridable. */
-  return (ED_operator_objectmode(C) && obact != NULL &&
-          (ID_IS_LINKED(obact) || (obact->instance_collection != NULL &&
-                                   ID_IS_OVERRIDABLE_LIBRARY(obact->instance_collection) &&
-                                   !ID_IS_OVERRIDE_LIBRARY(obact))));
+  return (
+      ED_operator_objectmode(C) && obact != NULL &&
+      (ID_IS_LINKED(obact) || ID_IS_OVERRIDE_LIBRARY(obact) ||
+       (obact->instance_collection != NULL &&
+        ID_IS_OVERRIDABLE_LIBRARY(obact->instance_collection) && !ID_IS_OVERRIDE_LIBRARY(obact))));
 }
 
 void OBJECT_OT_make_override_library(wmOperatorType *ot)
 {
   /* identifiers */
   ot->name = "Make Library Override";
-  ot->description = "Make a local override of this library linked data-block";
+  ot->description =
+      "Create a local override of the selected linked objects, and their hierarchy of "
+      "dependencies";
   ot->idname = "OBJECT_OT_make_override_library";
 
   /* api callbacks */
@@ -2508,6 +2552,130 @@ void OBJECT_OT_make_override_library(wmOperatorType *ot)
 /** \} */
 
 /* ------------------------------------------------------------------- */
+/** \name Reset Library Override Operator
+ * \{ */
+
+static bool reset_clear_override_library_poll(bContext *C)
+{
+  Object *obact = CTX_data_active_object(C);
+
+  /* Object must be local and an override. */
+  return (ED_operator_objectmode(C) && obact != NULL && !ID_IS_LINKED(obact) &&
+          ID_IS_OVERRIDE_LIBRARY(obact));
+}
+
+static int reset_override_library_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  Main *bmain = CTX_data_main(C);
+
+  /* Make already existing selected liboverrides editable. */
+  FOREACH_SELECTED_OBJECT_BEGIN (CTX_data_view_layer(C), CTX_wm_view3d(C), ob_iter) {
+    if (ID_IS_OVERRIDE_LIBRARY_REAL(ob_iter) && !ID_IS_LINKED(ob_iter)) {
+      BKE_lib_override_library_id_reset(bmain, &ob_iter->id, false);
+    }
+  }
+  FOREACH_SELECTED_OBJECT_END;
+
+  WM_event_add_notifier(C, NC_WINDOW, NULL);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, NULL);
+
+  return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_reset_override_library(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Reset Library Override";
+  ot->description = "Reset the selected local overrides to their linked references values";
+  ot->idname = "OBJECT_OT_reset_override_library";
+
+  /* api callbacks */
+  ot->exec = reset_override_library_exec;
+  ot->poll = reset_clear_override_library_poll;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/** \} */
+
+/* ------------------------------------------------------------------- */
+/** \name Clear Library Override Operator
+ * \{ */
+
+static int clear_override_library_exec(bContext *C, wmOperator *UNUSED(op))
+{
+  Main *bmain = CTX_data_main(C);
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  Scene *scene = CTX_data_scene(C);
+  LinkNode *todo_objects = NULL, *todo_object_iter;
+
+  /* Make already existing selected liboverrides editable. */
+  FOREACH_SELECTED_OBJECT_BEGIN (view_layer, CTX_wm_view3d(C), ob_iter) {
+    if (ID_IS_LINKED(ob_iter)) {
+      continue;
+    }
+    BLI_linklist_prepend_alloca(&todo_objects, ob_iter);
+  }
+  FOREACH_SELECTED_OBJECT_END;
+
+  for (todo_object_iter = todo_objects; todo_object_iter != NULL;
+       todo_object_iter = todo_object_iter->next) {
+    Object *ob_iter = todo_object_iter->link;
+    if (BKE_lib_override_library_is_hierarchy_leaf(bmain, &ob_iter->id)) {
+      bool do_remap_active = false;
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      if (BKE_view_layer_active_object_get(view_layer) == ob_iter) {
+        do_remap_active = true;
+      }
+      BKE_libblock_remap(bmain,
+                         &ob_iter->id,
+                         ob_iter->id.override_library->reference,
+                         ID_REMAP_SKIP_INDIRECT_USAGE);
+      if (do_remap_active) {
+        Object *ref_object = (Object *)ob_iter->id.override_library->reference;
+        Base *basact = BKE_view_layer_base_find(view_layer, ref_object);
+        if (basact != NULL) {
+          view_layer->basact = basact;
+        }
+        DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
+      }
+      BKE_id_delete(bmain, &ob_iter->id);
+    }
+    else {
+      BKE_lib_override_library_id_reset(bmain, &ob_iter->id, true);
+    }
+  }
+
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS | ID_RECALC_COPY_ON_WRITE);
+  WM_event_add_notifier(C, NC_WINDOW, NULL);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, NULL);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, NULL);
+
+  return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_clear_override_library(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Clear Library Override";
+  ot->description =
+      "Delete the selected local overrides and relink their usages to the linked data-blocks if "
+      "possible, else reset them and mark them as non editable";
+  ot->idname = "OBJECT_OT_clear_override_library";
+
+  /* api callbacks */
+  ot->exec = clear_override_library_exec;
+  ot->poll = reset_clear_override_library_poll;
+
+  /* flags */
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+/** \} */
+
+/* ------------------------------------------------------------------- */
 /** \name Make Single User Operator
  * \{ */
 
@@ -2528,7 +2696,7 @@ static int make_single_user_exec(bContext *C, wmOperator *op)
 
   if (RNA_boolean_get(op->ptr, "object")) {
     if (flag == SELECT) {
-      BKE_view_layer_selected_objects_tag(view_layer, OB_DONE);
+      BKE_view_layer_selected_objects_tag(scene, view_layer, OB_DONE);
       single_object_users(bmain, scene, v3d, OB_DONE, copy_collections);
     }
     else {
diff --git a/source/blender/editors/object/object_remesh.cc b/source/blender/editors/object/object_remesh.cc
index 8a7138b25ac..adc07d0b411 100644
--- a/source/blender/editors/object/object_remesh.cc
+++ b/source/blender/editors/object/object_remesh.cc
@@ -73,6 +73,9 @@
 
 #include "object_intern.h" /* own include */
 
+using blender::IndexRange;
+using blender::Span;
+
 /* TODO(sebpa): unstable, can lead to unrecoverable errors. */
 // #define USE_MESH_CURVATURE
 
@@ -128,7 +131,8 @@ static int voxel_remesh_exec(bContext *C, wmOperator *op)
   }
 
   /* Output mesh will be all smooth or all flat shading. */
-  const bool smooth_normals = mesh->mpoly[0].flag & ME_SMOOTH;
+  const Span<MPoly> polys = mesh->polys();
+  const bool smooth_normals = polys.first().flag & ME_SMOOTH;
 
   float isovalue = 0.0f;
   if (mesh->flag & ME_REMESH_REPROJECT_VOLUME) {
@@ -144,7 +148,7 @@ static int voxel_remesh_exec(bContext *C, wmOperator *op)
   }
 
   if (ob->mode == OB_MODE_SCULPT) {
-    ED_sculpt_undo_geometry_begin(ob, op->type->name);
+    ED_sculpt_undo_geometry_begin(ob, op);
   }
 
   if (mesh->flag & ME_REMESH_FIX_POLES && mesh->remesh_voxel_adaptivity <= 0.0f) {
@@ -175,14 +179,13 @@ static int voxel_remesh_exec(bContext *C, wmOperator *op)
     BKE_remesh_reproject_vertex_paint(new_mesh, mesh);
   }
 
-  BKE_mesh_nomain_to_mesh(new_mesh, mesh, ob, &CD_MASK_MESH, true);
+  BKE_mesh_nomain_to_mesh(new_mesh, mesh, ob);
 
   if (smooth_normals) {
     BKE_mesh_smooth_flag_set(static_cast<Mesh *>(ob->data), true);
   }
 
   if (ob->mode == OB_MODE_SCULPT) {
-    BKE_sculpt_ensure_orig_mesh_data(CTX_data_scene(C), ob);
     ED_sculpt_undo_geometry_end(ob);
   }
 
@@ -577,10 +580,18 @@ static int voxel_size_edit_invoke(bContext *C, wmOperator *op, const wmEvent *ev
   /* Use the Bounding Box face normal as the basis Z. */
   normal_tri_v3(cd->text_mat[2], cd->preview_plane[0], cd->preview_plane[1], cd->preview_plane[2]);
 
+  /* Invert object scale. */
+  float scale[3];
+  mat4_to_size(scale, active_object->obmat);
+  invert_v3(scale);
+  size_to_mat4(scale_mat, scale);
+
+  mul_m4_m4_pre(cd->text_mat, scale_mat);
+
   /* Write the text position into the matrix. */
   copy_v3_v3(cd->text_mat[3], text_pos);
 
-  /* Scale the text. */
+  /* Scale the text to constant viewport size. */
   float text_pos_word_space[3];
   mul_v3_m4v3(text_pos_word_space, active_object->obmat, text_pos);
   const float pixelsize = ED_view3d_pixel_size(rv3d, text_pos_word_space);
@@ -646,6 +657,7 @@ struct QuadriFlowJob {
   short *stop, *do_update;
   float *progress;
 
+  const struct wmOperator *op;
   Scene *scene;
   int target_faces;
   int seed;
@@ -669,9 +681,11 @@ static bool mesh_is_manifold_consistent(Mesh *mesh)
    * check that the direction of the faces are consistent and doesn't suddenly
    * flip
    */
+  const Span<MVert> verts = mesh->verts();
+  const Span<MEdge> edges = mesh->edges();
+  const Span<MLoop> loops = mesh->loops();
 
   bool is_manifold_consistent = true;
-  const MLoop *mloop = mesh->mloop;
   char *edge_faces = (char *)MEM_callocN(mesh->totedge * sizeof(char), "remesh_manifold_check");
   int *edge_vert = (int *)MEM_malloc_arrayN(
       mesh->totedge, sizeof(uint), "remesh_consistent_check");
@@ -680,18 +694,17 @@ static bool mesh_is_manifold_consistent(Mesh *mesh)
     edge_vert[i] = -1;
   }
 
-  for (uint loop_idx = 0; loop_idx < mesh->totloop; loop_idx++) {
-    const MLoop *loop = &mloop[loop_idx];
-    edge_faces[loop->e] += 1;
-    if (edge_faces[loop->e] > 2) {
+  for (const MLoop &loop : loops) {
+    edge_faces[loop.e] += 1;
+    if (edge_faces[loop.e] > 2) {
       is_manifold_consistent = false;
       break;
     }
 
-    if (edge_vert[loop->e] == -1) {
-      edge_vert[loop->e] = loop->v;
+    if (edge_vert[loop.e] == -1) {
+      edge_vert[loop.e] = loop.v;
     }
-    else if (edge_vert[loop->e] == loop->v) {
+    else if (edge_vert[loop.e] == loop.v) {
       /* Mesh has flips in the surface so it is non consistent */
       is_manifold_consistent = false;
       break;
@@ -699,16 +712,16 @@ static bool mesh_is_manifold_consistent(Mesh *mesh)
   }
 
   if (is_manifold_consistent) {
-    for (uint i = 0; i < mesh->totedge; i++) {
+    for (const int i : edges.index_range()) {
       /* Check for wire edges. */
       if (edge_faces[i] == 0) {
         is_manifold_consistent = false;
         break;
       }
       /* Check for zero length edges */
-      MVert *v1 = &mesh->mvert[mesh->medge[i].v1];
-      MVert *v2 = &mesh->mvert[mesh->medge[i].v2];
-      if (compare_v3v3(v1->co, v2->co, 1e-4f)) {
+      const MVert &v1 = verts[edges[i].v1];
+      const MVert &v2 = verts[edges[i].v2];
+      if (compare_v3v3(v1.co, v2.co, 1e-4f)) {
         is_manifold_consistent = false;
         break;
       }
@@ -883,7 +896,7 @@ static void quadriflow_start_job(void *customdata, short *stop, short *do_update
   new_mesh = remesh_symmetry_mirror(qj->owner, new_mesh, qj->symmetry_axes);
 
   if (ob->mode == OB_MODE_SCULPT) {
-    ED_sculpt_undo_geometry_begin(ob, "QuadriFlow Remesh");
+    ED_sculpt_undo_geometry_begin(ob, qj->op);
   }
 
   if (qj->preserve_paint_mask) {
@@ -891,14 +904,13 @@ static void quadriflow_start_job(void *customdata, short *stop, short *do_update
     BKE_mesh_remesh_reproject_paint_mask(new_mesh, mesh);
   }
 
-  BKE_mesh_nomain_to_mesh(new_mesh, mesh, ob, &CD_MASK_MESH, true);
+  BKE_mesh_nomain_to_mesh(new_mesh, mesh, ob);
 
   if (qj->smooth_normals) {
     BKE_mesh_smooth_flag_set(static_cast<Mesh *>(ob->data), true);
   }
 
   if (ob->mode == OB_MODE_SCULPT) {
-    BKE_sculpt_ensure_orig_mesh_data(qj->scene, ob);
     ED_sculpt_undo_geometry_end(ob);
   }
 
@@ -941,6 +953,7 @@ static int quadriflow_remesh_exec(bContext *C, wmOperator *op)
 {
   QuadriFlowJob *job = (QuadriFlowJob *)MEM_mallocN(sizeof(QuadriFlowJob), "QuadriFlowJob");
 
+  job->op = op;
   job->owner = CTX_data_active_object(C);
   job->scene = CTX_data_scene(C);
 
diff --git a/source/blender/editors/object/object_select.c b/source/blender/editors/object/object_select.c
index c3d8fb9cfe5..43867877fdb 100644
--- a/source/blender/editors/object/object_select.c
+++ b/source/blender/editors/object/object_select.c
@@ -117,29 +117,28 @@ void ED_object_base_activate(bContext *C, Base *base)
 
 void ED_object_base_activate_with_mode_exit_if_needed(bContext *C, Base *base)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   /* Currently we only need to be concerned with edit-mode. */
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit) {
     Object *ob = base->object;
     if (((ob->mode & OB_MODE_EDIT) == 0) || (obedit->type != ob->type)) {
       Main *bmain = CTX_data_main(C);
-      Scene *scene = CTX_data_scene(C);
       ED_object_editmode_exit_multi_ex(bmain, scene, view_layer, EM_FREEDATA);
     }
   }
   ED_object_base_activate(C, base);
 }
 
-bool ED_object_base_deselect_all_ex(ViewLayer *view_layer,
-                                    View3D *v3d,
-                                    int action,
-                                    bool *r_any_visible)
+bool ED_object_base_deselect_all_ex(
+    const Scene *scene, ViewLayer *view_layer, View3D *v3d, int action, bool *r_any_visible)
 {
   if (action == SEL_TOGGLE) {
     action = SEL_SELECT;
-    FOREACH_VISIBLE_BASE_BEGIN (view_layer, v3d, base) {
+    FOREACH_VISIBLE_BASE_BEGIN (scene, view_layer, v3d, base) {
       if (v3d && ((v3d->object_type_exclude_select & (1 << base->object->type)) != 0)) {
         continue;
       }
@@ -153,7 +152,7 @@ bool ED_object_base_deselect_all_ex(ViewLayer *view_layer,
 
   bool any_visible = false;
   bool changed = false;
-  FOREACH_VISIBLE_BASE_BEGIN (view_layer, v3d, base) {
+  FOREACH_VISIBLE_BASE_BEGIN (scene, view_layer, v3d, base) {
     if (v3d && ((v3d->object_type_exclude_select & (1 << base->object->type)) != 0)) {
       continue;
     }
@@ -190,9 +189,12 @@ bool ED_object_base_deselect_all_ex(ViewLayer *view_layer,
   return changed;
 }
 
-bool ED_object_base_deselect_all(ViewLayer *view_layer, View3D *v3d, int action)
+bool ED_object_base_deselect_all(const Scene *scene,
+                                 ViewLayer *view_layer,
+                                 View3D *v3d,
+                                 int action)
 {
-  return ED_object_base_deselect_all_ex(view_layer, v3d, action, NULL);
+  return ED_object_base_deselect_all_ex(scene, view_layer, v3d, action, NULL);
 }
 
 /** \} */
@@ -203,7 +205,7 @@ bool ED_object_base_deselect_all(ViewLayer *view_layer, View3D *v3d, int action)
 
 static int get_base_select_priority(Base *base)
 {
-  if (base->flag & BASE_VISIBLE_DEPSGRAPH) {
+  if (base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) {
     if (base->flag & BASE_SELECTABLE) {
       return 3;
     }
@@ -212,12 +214,13 @@ static int get_base_select_priority(Base *base)
   return 1;
 }
 
-Base *ED_object_find_first_by_data_id(ViewLayer *view_layer, ID *id)
+Base *ED_object_find_first_by_data_id(const Scene *scene, ViewLayer *view_layer, ID *id)
 {
   BLI_assert(OB_DATA_SUPPORT_ID(GS(id->name)));
 
   /* Try active object. */
-  Base *basact = view_layer->basact;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *basact = BKE_view_layer_active_base_get(view_layer);
 
   if (basact && basact->object && basact->object->data == id) {
     return basact;
@@ -227,7 +230,7 @@ Base *ED_object_find_first_by_data_id(ViewLayer *view_layer, ID *id)
   Base *base_best = NULL;
   int priority_best = 0;
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->object && base->object->data == id) {
       if (base->flag & BASE_SELECTED) {
         return base;
@@ -247,8 +250,10 @@ Base *ED_object_find_first_by_data_id(ViewLayer *view_layer, ID *id)
 
 bool ED_object_jump_to_object(bContext *C, Object *ob, const bool UNUSED(reveal_hidden))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, ob);
 
   if (base == NULL) {
@@ -257,10 +262,10 @@ bool ED_object_jump_to_object(bContext *C, Object *ob, const bool UNUSED(reveal_
 
   /* TODO: use 'reveal_hidden', as is done with bones. */
 
-  if (view_layer->basact != base || !(base->flag & BASE_SELECTED)) {
+  if (BKE_view_layer_active_base_get(view_layer) != base || !(base->flag & BASE_SELECTED)) {
     /* Select if not selected. */
     if (!(base->flag & BASE_SELECTED)) {
-      ED_object_base_deselect_all(view_layer, v3d, SEL_DESELECT);
+      ED_object_base_deselect_all(scene, view_layer, v3d, SEL_DESELECT);
 
       if (BASE_VISIBLE(v3d, base)) {
         ED_object_base_select(base, BA_SELECT);
@@ -382,6 +387,7 @@ static bool objects_selectable_poll(bContext *C)
 
 static int object_select_by_type_exec(bContext *C, wmOperator *op)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   short obtype, extend;
@@ -390,7 +396,7 @@ static int object_select_by_type_exec(bContext *C, wmOperator *op)
   extend = RNA_boolean_get(op->ptr, "extend");
 
   if (extend == 0) {
-    ED_object_base_deselect_all(view_layer, v3d, SEL_DESELECT);
+    ED_object_base_deselect_all(scene, view_layer, v3d, SEL_DESELECT);
   }
 
   CTX_DATA_BEGIN (C, Base *, base, visible_bases) {
@@ -400,7 +406,6 @@ static int object_select_by_type_exec(bContext *C, wmOperator *op)
   }
   CTX_DATA_END;
 
-  Scene *scene = CTX_data_scene(C);
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
@@ -623,10 +628,11 @@ static int object_select_linked_exec(bContext *C, wmOperator *op)
   extend = RNA_boolean_get(op->ptr, "extend");
 
   if (extend == 0) {
-    ED_object_base_deselect_all(view_layer, v3d, SEL_DESELECT);
+    ED_object_base_deselect_all(scene, view_layer, v3d, SEL_DESELECT);
   }
 
-  ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ob = BKE_view_layer_active_object_get(view_layer);
   if (ob == NULL) {
     BKE_report(op->reports, RPT_ERROR, "No active object");
     return OPERATOR_CANCELLED;
@@ -777,17 +783,21 @@ static bool select_grouped_children(bContext *C, Object *ob, const bool recursiv
   return changed;
 }
 
-static bool select_grouped_parent(bContext *C) /* Makes parent active and de-selected OBACT */
+/* Makes parent active and de-selected BKE_view_layer_active_object_get. */
+static bool select_grouped_parent(bContext *C)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   Base *baspar, *basact = CTX_data_active_base(C);
   bool changed = false;
 
   if (!basact || !(basact->object->parent)) {
-    return 0; /* we know OBACT is valid */
+    /* We know BKE_view_layer_active_object_get is valid. */
+    return 0;
   }
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   baspar = BKE_view_layer_base_find(view_layer, basact->object->parent);
 
   /* can be NULL if parent in other scene */
@@ -856,6 +866,7 @@ static bool select_grouped_collection(bContext *C, Object *ob)
 
 static bool select_grouped_object_hooks(bContext *C, Object *ob)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
@@ -868,6 +879,7 @@ static bool select_grouped_object_hooks(bContext *C, Object *ob)
     if (md->type == eModifierType_Hook) {
       hmd = (HookModifierData *)md;
       if (hmd->object) {
+        BKE_view_layer_synced_ensure(scene, view_layer);
         base = BKE_view_layer_base_find(view_layer, hmd->object);
         if (base && ((base->flag & BASE_SELECTED) == 0) && (BASE_SELECTABLE(v3d, base))) {
           ED_object_base_select(base, BA_SELECT);
@@ -1018,10 +1030,11 @@ static int object_select_grouped_exec(bContext *C, wmOperator *op)
   extend = RNA_boolean_get(op->ptr, "extend");
 
   if (extend == 0) {
-    changed = ED_object_base_deselect_all(view_layer, v3d, SEL_DESELECT);
+    changed = ED_object_base_deselect_all(scene, view_layer, v3d, SEL_DESELECT);
   }
 
-  ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ob = BKE_view_layer_active_object_get(view_layer);
   if (ob == NULL) {
     BKE_report(op->reports, RPT_ERROR, "No active object");
     return OPERATOR_CANCELLED;
@@ -1111,15 +1124,15 @@ void OBJECT_OT_select_grouped(wmOperatorType *ot)
 
 static int object_select_all_exec(bContext *C, wmOperator *op)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
   int action = RNA_enum_get(op->ptr, "action");
   bool any_visible = false;
 
-  bool changed = ED_object_base_deselect_all_ex(view_layer, v3d, action, &any_visible);
+  bool changed = ED_object_base_deselect_all_ex(scene, view_layer, v3d, action, &any_visible);
 
   if (changed) {
-    Scene *scene = CTX_data_scene(C);
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
@@ -1128,7 +1141,7 @@ static int object_select_all_exec(bContext *C, wmOperator *op)
     return OPERATOR_FINISHED;
   }
   if (any_visible == false) {
-    /* TODO(campbell): Looks like we could remove this,
+    /* TODO(@campbellbarton): Looks like we could remove this,
      * if not comment should say why its needed. */
     return OPERATOR_PASS_THROUGH;
   }
@@ -1238,6 +1251,7 @@ static int object_select_mirror_exec(bContext *C, wmOperator *op)
     if (!STREQ(name_flip, primbase->object->id.name + 2)) {
       Object *ob = (Object *)BKE_libblock_find_name(bmain, ID_OB, name_flip);
       if (ob) {
+        BKE_view_layer_synced_ensure(scene, view_layer);
         Base *secbase = BKE_view_layer_base_find(view_layer, ob);
 
         if (secbase) {
@@ -1289,9 +1303,11 @@ void OBJECT_OT_select_mirror(wmOperatorType *ot)
 
 static bool object_select_more_less(bContext *C, const bool select)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     Object *ob = base->object;
     ob->flag &= ~OB_DONE;
     ob->id.tag &= ~LIB_TAG_DOIT;
diff --git a/source/blender/editors/object/object_shader_fx.c b/source/blender/editors/object/object_shader_fx.c
index dd7fc192dc1..4b721cb65a1 100644
--- a/source/blender/editors/object/object_shader_fx.c
+++ b/source/blender/editors/object/object_shader_fx.c
@@ -481,12 +481,15 @@ static int shaderfx_remove_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Object *ob = ED_object_active_context(C);
   ShaderFxData *fx = edit_shaderfx_property_get(op, ob, 0);
+  if (!fx) {
+    return OPERATOR_CANCELLED;
+  }
 
   /* Store name temporarily for report. */
   char name[MAX_NAME];
   strcpy(name, fx->name);
 
-  if (!fx || !ED_object_shaderfx_remove(op->reports, bmain, ob, fx)) {
+  if (!ED_object_shaderfx_remove(op->reports, bmain, ob, fx)) {
     return OPERATOR_CANCELLED;
   }
 
@@ -671,7 +674,9 @@ static int shaderfx_copy_exec(bContext *C, wmOperator *op)
 {
   Object *ob = ED_object_active_context(C);
   ShaderFxData *fx = edit_shaderfx_property_get(op, ob, 0);
-
+  if (!fx) {
+    return OPERATOR_CANCELLED;
+  }
   ShaderFxData *nfx = BKE_shaderfx_new(fx->type);
   if (!nfx) {
     return OPERATOR_CANCELLED;
diff --git a/source/blender/editors/object/object_shapekey.c b/source/blender/editors/object/object_shapekey.c
index ebcf8573ccd..0328f6a6230 100644
--- a/source/blender/editors/object/object_shapekey.c
+++ b/source/blender/editors/object/object_shapekey.c
@@ -20,6 +20,8 @@
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
 
+#include "BLT_translation.h"
+
 #include "DNA_key_types.h"
 #include "DNA_lattice_types.h"
 #include "DNA_mesh_types.h"
@@ -112,14 +114,13 @@ static bool object_shape_key_mirror(
 
     if (ob->type == OB_MESH) {
       Mesh *me = ob->data;
-      MVert *mv;
       int i1, i2;
       float *fp1, *fp2;
       float tvec[3];
 
       ED_mesh_mirror_spatial_table_begin(ob, NULL, NULL);
 
-      for (i1 = 0, mv = me->mvert; i1 < me->totvert; i1++, mv++) {
+      for (i1 = 0; i1 < me->totvert; i1++) {
         i2 = mesh_get_x_mirror_vert(ob, NULL, i1, use_topology);
         if (i2 == i1) {
           fp1 = ((float *)kb->data) + i1 * 3;
@@ -299,6 +300,10 @@ static int shape_key_remove_exec(bContext *C, wmOperator *op)
   bool changed = false;
 
   if (RNA_boolean_get(op->ptr, "all")) {
+    if (RNA_boolean_get(op->ptr, "apply_mix")) {
+      float *arr = BKE_key_evaluate_object_ex(ob, NULL, NULL, 0, ob->data);
+      MEM_freeN(arr);
+    }
     changed = BKE_object_shapekey_free(bmain, ob);
   }
   else {
@@ -315,6 +320,34 @@ static int shape_key_remove_exec(bContext *C, wmOperator *op)
   return OPERATOR_CANCELLED;
 }
 
+static bool shape_key_remove_poll_property(const bContext *UNUSED(C),
+                                           wmOperator *op,
+                                           const PropertyRNA *prop)
+{
+  const char *prop_id = RNA_property_identifier(prop);
+  const bool do_all = RNA_enum_get(op->ptr, "all");
+
+  /* Only show seed for randomize action! */
+  if (STREQ(prop_id, "apply_mix") && !do_all) {
+    return false;
+  }
+  return true;
+}
+
+static char *shape_key_remove_get_description(bContext *UNUSED(C),
+                                              wmOperatorType *UNUSED(ot),
+                                              PointerRNA *ptr)
+{
+  const bool do_apply_mix = RNA_boolean_get(ptr, "apply_mix");
+
+  if (do_apply_mix) {
+    return BLI_strdup(
+        TIP_("Apply current visible shape to the object data, and delete all shape keys"));
+  }
+
+  return NULL;
+}
+
 void OBJECT_OT_shape_key_remove(wmOperatorType *ot)
 {
   /* identifiers */
@@ -325,12 +358,19 @@ void OBJECT_OT_shape_key_remove(wmOperatorType *ot)
   /* api callbacks */
   ot->poll = shape_key_mode_exists_poll;
   ot->exec = shape_key_remove_exec;
+  ot->poll_property = shape_key_remove_poll_property;
+  ot->get_description = shape_key_remove_get_description;
 
   /* flags */
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
   /* properties */
-  RNA_def_boolean(ot->srna, "all", 0, "All", "Remove all shape keys");
+  RNA_def_boolean(ot->srna, "all", false, "All", "Remove all shape keys");
+  RNA_def_boolean(ot->srna,
+                  "apply_mix",
+                  false,
+                  "Apply Mix",
+                  "Apply current mix of shape keys to the geometry before removing them");
 }
 
 /** \} */
diff --git a/source/blender/editors/object/object_transform.cc b/source/blender/editors/object/object_transform.cc
index 70c3eed3768..0a86ae28b3e 100644
--- a/source/blender/editors/object/object_transform.cc
+++ b/source/blender/editors/object/object_transform.cc
@@ -321,7 +321,7 @@ static int object_clear_transform_generic_exec(bContext *C,
     BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
     xcs = ED_object_xform_skip_child_container_create();
     ED_object_xform_skip_child_container_item_ensure_from_array(
-        xcs, view_layer, objects.data(), objects.size());
+        xcs, scene, view_layer, objects.data(), objects.size());
   }
   if (use_transform_data_origin) {
     BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
@@ -1033,7 +1033,9 @@ static int apply_objects_internal(bContext *C,
         zero_v3(ob->rot);
         zero_v3(ob->drot);
         unit_qt(ob->quat);
+        unit_qt(ob->dquat);
         unit_axis_angle(ob->rotAxis, &ob->rotAngle);
+        unit_axis_angle(ob->drotAxis, &ob->drotAngle);
       }
     }
 
@@ -1601,6 +1603,7 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
                     }
                   }
                 }
+                BKE_gpencil_stroke_geometry_update(gpd, gps);
               }
             }
           }
@@ -2222,7 +2225,7 @@ static int object_transform_axis_target_modal(bContext *C, wmOperator *op, const
 
   bool is_finished = false;
 
-  if (ISMOUSE(xfd->init_event)) {
+  if (ISMOUSE_BUTTON(xfd->init_event)) {
     if ((event->type == xfd->init_event) && (event->val == KM_RELEASE)) {
       is_finished = true;
     }
diff --git a/source/blender/editors/object/object_utils.c b/source/blender/editors/object/object_utils.c
index cb9c8a92abe..50ba5b8af5f 100644
--- a/source/blender/editors/object/object_utils.c
+++ b/source/blender/editors/object/object_utils.c
@@ -22,6 +22,7 @@
 #include "BKE_armature.h"
 #include "BKE_editmesh.h"
 #include "BKE_lattice.h"
+#include "BKE_layer.h"
 #include "BKE_object.h"
 #include "BKE_scene.h"
 
@@ -169,6 +170,7 @@ struct XFormObjectSkipChild_Container *ED_object_xform_skip_child_container_crea
 
 void ED_object_xform_skip_child_container_item_ensure_from_array(
     struct XFormObjectSkipChild_Container *xcs,
+    const Scene *scene,
     ViewLayer *view_layer,
     Object **objects,
     uint objects_len)
@@ -178,8 +180,9 @@ void ED_object_xform_skip_child_container_item_ensure_from_array(
     Object *ob = objects[ob_index];
     BLI_gset_add(objects_in_transdata, ob);
   }
-
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ListBase *object_bases = BKE_view_layer_object_bases_get(view_layer);
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     Object *ob = base->object;
     if (ob->parent != NULL) {
       if (!BLI_gset_haskey(objects_in_transdata, ob)) {
@@ -209,7 +212,7 @@ void ED_object_xform_skip_child_container_item_ensure_from_array(
     }
   }
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     Object *ob = base->object;
 
     if (BLI_gset_haskey(objects_in_transdata, ob)) {
diff --git a/source/blender/editors/object/object_vgroup.c b/source/blender/editors/object/object_vgroup.cc
index 17b7fe7fe5e..1d1263494c7 100644
--- a/source/blender/editors/object/object_vgroup.c
+++ b/source/blender/editors/object/object_vgroup.cc
@@ -5,9 +5,9 @@
  * \ingroup edobj
  */
 
-#include <math.h>
-#include <stddef.h>
-#include <string.h>
+#include <cmath>
+#include <cstddef>
+#include <cstring>
 
 #include "MEM_guardedalloc.h"
 
@@ -21,14 +21,15 @@
 #include "DNA_scene_types.h"
 #include "DNA_workspace_types.h"
 
-#include "BLI_alloca.h"
 #include "BLI_array.h"
+#include "BLI_array.hh"
 #include "BLI_bitmap.h"
 #include "BLI_blenlib.h"
 #include "BLI_listbase.h"
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
 #include "BLI_utildefines_stack.h"
+#include "BLI_vector.hh"
 
 #include "BKE_context.h"
 #include "BKE_customdata.h"
@@ -66,6 +67,9 @@
 
 #include "object_intern.h"
 
+using blender::MutableSpan;
+using blender::Span;
+
 static bool vertex_group_supported_poll_ex(bContext *C, const Object *ob);
 
 /* -------------------------------------------------------------------- */
@@ -74,7 +78,7 @@ static bool vertex_group_supported_poll_ex(bContext *C, const Object *ob);
 
 static bool object_array_for_wpaint_filter(const Object *ob, void *user_data)
 {
-  bContext *C = user_data;
+  bContext *C = static_cast<bContext *>(user_data);
   if (vertex_group_supported_poll_ex(C, ob)) {
     return true;
   }
@@ -100,7 +104,7 @@ static bool vertex_group_use_vert_sel(Object *ob)
 
 static Lattice *vgroup_edit_lattice(Object *ob)
 {
-  Lattice *lt = ob->data;
+  Lattice *lt = static_cast<Lattice *>(ob->data);
   BLI_assert(ob->type == OB_LATTICE);
   return (lt->editlatt) ? lt->editlatt->latt : lt;
 }
@@ -115,7 +119,7 @@ bool ED_vgroup_sync_from_pose(Object *ob)
 {
   Object *armobj = BKE_object_pose_armature_get(ob);
   if (armobj && (armobj->mode & OB_MODE_POSE)) {
-    struct bArmature *arm = armobj->data;
+    bArmature *arm = static_cast<bArmature *>(armobj->data);
     if (arm->act_bone) {
       int def_num = BKE_object_defgroup_name_index(ob, arm->act_bone->name);
       if (def_num != -1) {
@@ -151,7 +155,7 @@ bool ED_vgroup_parray_alloc(ID *id,
                             const bool use_vert_sel)
 {
   *dvert_tot = 0;
-  *dvert_arr = NULL;
+  *dvert_arr = nullptr;
 
   if (id) {
     switch (GS(id->name)) {
@@ -172,42 +176,45 @@ bool ED_vgroup_parray_alloc(ID *id,
 
           i = em->bm->totvert;
 
-          *dvert_arr = MEM_mallocN(sizeof(void *) * i, "vgroup parray from me");
+          *dvert_arr = static_cast<MDeformVert **>(MEM_mallocN(sizeof(void *) * i, __func__));
           *dvert_tot = i;
 
           i = 0;
           if (use_vert_sel) {
             BM_ITER_MESH (eve, &iter, em->bm, BM_VERTS_OF_MESH) {
               (*dvert_arr)[i] = BM_elem_flag_test(eve, BM_ELEM_SELECT) ?
-                                    BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset) :
-                                    NULL;
+                                    static_cast<MDeformVert *>(
+                                        BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset)) :
+                                    nullptr;
               i++;
             }
           }
           else {
             BM_ITER_MESH (eve, &iter, em->bm, BM_VERTS_OF_MESH) {
-              (*dvert_arr)[i] = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+              (*dvert_arr)[i] = static_cast<MDeformVert *>(
+                  BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
               i++;
             }
           }
 
           return true;
         }
-        if (me->dvert) {
-          MVert *mvert = me->mvert;
-          MDeformVert *dvert = me->dvert;
+        if (!me->deform_verts().is_empty()) {
+          const Span<MVert> verts = me->verts();
+          MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
 
           *dvert_tot = me->totvert;
-          *dvert_arr = MEM_mallocN(sizeof(void *) * me->totvert, "vgroup parray from me");
+          *dvert_arr = static_cast<MDeformVert **>(
+              MEM_mallocN(sizeof(void *) * me->totvert, __func__));
 
           if (use_vert_sel) {
             for (int i = 0; i < me->totvert; i++) {
-              (*dvert_arr)[i] = (mvert[i].flag & SELECT) ? &dvert[i] : NULL;
+              (*dvert_arr)[i] = (verts[i].flag & SELECT) ? &dverts[i] : nullptr;
             }
           }
           else {
             for (int i = 0; i < me->totvert; i++) {
-              (*dvert_arr)[i] = me->dvert + i;
+              (*dvert_arr)[i] = &dverts[i];
             }
           }
 
@@ -222,11 +229,12 @@ bool ED_vgroup_parray_alloc(ID *id,
         if (lt->dvert) {
           BPoint *def = lt->def;
           *dvert_tot = lt->pntsu * lt->pntsv * lt->pntsw;
-          *dvert_arr = MEM_mallocN(sizeof(void *) * (*dvert_tot), "vgroup parray from me");
+          *dvert_arr = static_cast<MDeformVert **>(
+              MEM_mallocN(sizeof(void *) * (*dvert_tot), __func__));
 
           if (use_vert_sel) {
             for (int i = 0; i < *dvert_tot; i++) {
-              (*dvert_arr)[i] = (def->f1 & SELECT) ? &lt->dvert[i] : NULL;
+              (*dvert_arr)[i] = (def->f1 & SELECT) ? &lt->dvert[i] : nullptr;
             }
           }
           else {
@@ -255,11 +263,12 @@ void ED_vgroup_parray_mirror_sync(Object *ob,
                                   const int vgroup_tot)
 {
   BMEditMesh *em = BKE_editmesh_from_object(ob);
-  MDeformVert **dvert_array_all = NULL;
+  MDeformVert **dvert_array_all = nullptr;
   int dvert_tot_all;
 
   /* get an array of all verts, not only selected */
-  if (ED_vgroup_parray_alloc(ob->data, &dvert_array_all, &dvert_tot_all, false) == false) {
+  if (ED_vgroup_parray_alloc(
+          static_cast<ID *>(ob->data), &dvert_array_all, &dvert_tot_all, false) == false) {
     BLI_assert(0);
     return;
   }
@@ -268,13 +277,13 @@ void ED_vgroup_parray_mirror_sync(Object *ob,
   }
 
   int flip_map_len;
-  const int *flip_map = BKE_object_defgroup_flip_map(ob, &flip_map_len, true);
+  const int *flip_map = BKE_object_defgroup_flip_map(ob, true, &flip_map_len);
 
   for (int i_src = 0; i_src < dvert_tot; i_src++) {
-    if (dvert_array[i_src] != NULL) {
+    if (dvert_array[i_src] != nullptr) {
       /* its selected, check if its mirror exists */
       int i_dst = ED_mesh_mirror_get_vert(ob, i_src);
-      if (i_dst != -1 && dvert_array_all[i_dst] != NULL) {
+      if (i_dst != -1 && dvert_array_all[i_dst] != nullptr) {
         /* we found a match! */
         const MDeformVert *dv_src = dvert_array[i_src];
         MDeformVert *dv_dst = dvert_array_all[i_dst];
@@ -294,11 +303,12 @@ void ED_vgroup_parray_mirror_sync(Object *ob,
 void ED_vgroup_parray_mirror_assign(Object *ob, MDeformVert **dvert_array, const int dvert_tot)
 {
   BMEditMesh *em = BKE_editmesh_from_object(ob);
-  MDeformVert **dvert_array_all = NULL;
+  MDeformVert **dvert_array_all = nullptr;
   int dvert_tot_all;
 
   /* get an array of all verts, not only selected */
-  if (ED_vgroup_parray_alloc(ob->data, &dvert_array_all, &dvert_tot_all, false) == false) {
+  if (ED_vgroup_parray_alloc(
+          static_cast<ID *>(ob->data), &dvert_array_all, &dvert_tot_all, false) == false) {
     BLI_assert(0);
     return;
   }
@@ -308,7 +318,7 @@ void ED_vgroup_parray_mirror_assign(Object *ob, MDeformVert **dvert_array, const
   }
 
   for (int i = 0; i < dvert_tot; i++) {
-    if (dvert_array[i] == NULL) {
+    if (dvert_array[i] == nullptr) {
       /* its unselected, check if its mirror is */
       int i_sel = ED_mesh_mirror_get_vert(ob, i);
       if ((i_sel != -1) && (i_sel != i) && (dvert_array[i_sel])) {
@@ -357,8 +367,8 @@ void ED_vgroup_parray_remove_zero(MDeformVert **dvert_array,
 
 bool ED_vgroup_array_copy(Object *ob, Object *ob_from)
 {
-  MDeformVert **dvert_array_from = NULL, **dvf;
-  MDeformVert **dvert_array = NULL, **dv;
+  MDeformVert **dvert_array_from = nullptr, **dvf;
+  MDeformVert **dvert_array = nullptr, **dv;
   int dvert_tot_from;
   int dvert_tot;
   int i;
@@ -378,17 +388,18 @@ bool ED_vgroup_array_copy(Object *ob, Object *ob_from)
   /* In case we copy vgroup between two objects using same data,
    * we only have to care about object side of things. */
   if (ob->data != ob_from->data) {
-    ED_vgroup_parray_alloc(ob_from->data, &dvert_array_from, &dvert_tot_from, false);
-    ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, false);
+    ED_vgroup_parray_alloc(
+        static_cast<ID *>(ob_from->data), &dvert_array_from, &dvert_tot_from, false);
+    ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, false);
 
-    if ((dvert_array == NULL) && (dvert_array_from != NULL) &&
-        BKE_object_defgroup_data_create(ob->data)) {
-      ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, false);
+    if ((dvert_array == nullptr) && (dvert_array_from != nullptr) &&
+        BKE_object_defgroup_data_create(static_cast<ID *>(ob->data))) {
+      ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, false);
       new_vgroup = true;
     }
 
-    if (dvert_tot == 0 || (dvert_tot != dvert_tot_from) || dvert_array_from == NULL ||
-        dvert_array == NULL) {
+    if (dvert_tot == 0 || (dvert_tot != dvert_tot_from) || dvert_array_from == nullptr ||
+        dvert_array == nullptr) {
       if (dvert_array) {
         MEM_freeN(dvert_array);
       }
@@ -413,7 +424,7 @@ bool ED_vgroup_array_copy(Object *ob, Object *ob_from)
 
   if (defbase_tot_from < defbase_tot) {
     /* correct vgroup indices because the number of vgroups is being reduced. */
-    int *remap = MEM_mallocN(sizeof(int) * (defbase_tot + 1), __func__);
+    blender::Array<int> remap(defbase_tot + 1);
     for (i = 0; i <= defbase_tot_from; i++) {
       remap[i] = i;
     }
@@ -421,11 +432,10 @@ bool ED_vgroup_array_copy(Object *ob, Object *ob_from)
       remap[i] = 0; /* can't use these, so disable */
     }
 
-    BKE_object_defgroup_remap_update_users(ob, remap);
-    MEM_freeN(remap);
+    BKE_object_defgroup_remap_update_users(ob, remap.data());
   }
 
-  if (dvert_array_from != NULL && dvert_array != NULL) {
+  if (dvert_array_from != nullptr && dvert_array != nullptr) {
     dvf = dvert_array_from;
     dv = dvert_array;
 
@@ -434,7 +444,7 @@ bool ED_vgroup_array_copy(Object *ob, Object *ob_from)
       *(*dv) = *(*dvf);
 
       if ((*dv)->dw) {
-        (*dv)->dw = MEM_dupallocN((*dv)->dw);
+        (*dv)->dw = static_cast<MDeformWeight *>(MEM_dupallocN((*dv)->dw));
       }
     }
 
@@ -496,14 +506,14 @@ static void mesh_defvert_mirror_update_internal(Object *ob,
   if (def_nr == -1) {
     /* All vgroups, add groups where needed. */
     int flip_map_len;
-    int *flip_map = BKE_object_defgroup_flip_map(ob, &flip_map_len, true);
+    int *flip_map = BKE_object_defgroup_flip_map_unlocked(ob, true, &flip_map_len);
     BKE_defvert_sync_mapped(dvert_dst, dvert_src, flip_map, flip_map_len, true);
     MEM_freeN(flip_map);
   }
   else {
     /* Single vgroup. */
     MDeformWeight *dw = BKE_defvert_ensure_index(dvert_dst,
-                                                 BKE_object_defgroup_flip_index(ob, def_nr, 1));
+                                                 BKE_object_defgroup_flip_index(ob, def_nr, true));
     if (dw) {
       dw->weight = BKE_defvert_find_weight(dvert_src, def_nr);
     }
@@ -513,7 +523,7 @@ static void mesh_defvert_mirror_update_internal(Object *ob,
 static void ED_mesh_defvert_mirror_update_em(
     Object *ob, BMVert *eve, int def_nr, int vidx, const int cd_dvert_offset)
 {
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   BMEditMesh *em = me->edit_mesh;
   BMVert *eve_mirr;
   bool use_topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
@@ -521,8 +531,10 @@ static void ED_mesh_defvert_mirror_update_em(
   eve_mirr = editbmesh_get_x_mirror_vert(ob, em, eve, eve->co, vidx, use_topology);
 
   if (eve_mirr && eve_mirr != eve) {
-    MDeformVert *dvert_src = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
-    MDeformVert *dvert_dst = BM_ELEM_CD_GET_VOID_P(eve_mirr, cd_dvert_offset);
+    MDeformVert *dvert_src = static_cast<MDeformVert *>(
+        BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
+    MDeformVert *dvert_dst = static_cast<MDeformVert *>(
+        BM_ELEM_CD_GET_VOID_P(eve_mirr, cd_dvert_offset));
     mesh_defvert_mirror_update_internal(ob, dvert_dst, dvert_src, def_nr);
   }
 }
@@ -530,25 +542,26 @@ static void ED_mesh_defvert_mirror_update_em(
 static void ED_mesh_defvert_mirror_update_ob(Object *ob, int def_nr, int vidx)
 {
   int vidx_mirr;
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   bool use_topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
 
   if (vidx == -1) {
     return;
   }
 
-  vidx_mirr = mesh_get_x_mirror_vert(ob, NULL, vidx, use_topology);
+  vidx_mirr = mesh_get_x_mirror_vert(ob, nullptr, vidx, use_topology);
 
+  MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
   if ((vidx_mirr) >= 0 && (vidx_mirr != vidx)) {
-    MDeformVert *dvert_src = &me->dvert[vidx];
-    MDeformVert *dvert_dst = &me->dvert[vidx_mirr];
+    MDeformVert *dvert_src = &dverts[vidx];
+    MDeformVert *dvert_dst = &dverts[vidx_mirr];
     mesh_defvert_mirror_update_internal(ob, dvert_dst, dvert_src, def_nr);
   }
 }
 
 void ED_vgroup_vert_active_mirror(Object *ob, int def_nr)
 {
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   BMEditMesh *em = me->edit_mesh;
   MDeformVert *dvert_act;
 
@@ -584,7 +597,7 @@ static void vgroup_remove_weight(Object *ob, const int def_nr)
 
 static bool vgroup_normalize_active_vertex(Object *ob, eVGroupSelect subset_type)
 {
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   BMEditMesh *em = me->edit_mesh;
   BMVert *eve_act;
   int v_act;
@@ -599,7 +612,7 @@ static bool vgroup_normalize_active_vertex(Object *ob, eVGroupSelect subset_type
     dvert_act = ED_mesh_active_dvert_get_ob(ob, &v_act);
   }
 
-  if (dvert_act == NULL) {
+  if (dvert_act == nullptr) {
     return false;
   }
 
@@ -623,7 +636,7 @@ static bool vgroup_normalize_active_vertex(Object *ob, eVGroupSelect subset_type
 
 static void vgroup_copy_active_to_sel(Object *ob, eVGroupSelect subset_type)
 {
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   BMEditMesh *em = me->edit_mesh;
   MDeformVert *dvert_act;
   int i, vgroup_tot, subset_count;
@@ -639,7 +652,8 @@ static void vgroup_copy_active_to_sel(Object *ob, eVGroupSelect subset_type)
     if (dvert_act) {
       BM_ITER_MESH_INDEX (eve, &iter, em->bm, BM_VERTS_OF_MESH, i) {
         if (BM_elem_flag_test(eve, BM_ELEM_SELECT) && eve != eve_act) {
-          MDeformVert *dv = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+          MDeformVert *dv = static_cast<MDeformVert *>(
+              BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
           BKE_defvert_copy_subset(dv, dvert_act, vgroup_validmap, vgroup_tot);
           if (me->symmetry & ME_SYMMETRY_X) {
             ED_mesh_defvert_mirror_update_em(ob, eve, -1, i, cd_dvert_offset);
@@ -649,15 +663,15 @@ static void vgroup_copy_active_to_sel(Object *ob, eVGroupSelect subset_type)
     }
   }
   else {
-    MDeformVert *dv;
+    const Span<MVert> verts = me->verts();
     int v_act;
 
     dvert_act = ED_mesh_active_dvert_get_ob(ob, &v_act);
     if (dvert_act) {
-      dv = me->dvert;
-      for (i = 0; i < me->totvert; i++, dv++) {
-        if ((me->mvert[i].flag & SELECT) && dv != dvert_act) {
-          BKE_defvert_copy_subset(dv, dvert_act, vgroup_validmap, vgroup_tot);
+      MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
+      for (i = 0; i < me->totvert; i++) {
+        if ((verts[i].flag & SELECT) && &dverts[i] != dvert_act) {
+          BKE_defvert_copy_subset(&dverts[i], dvert_act, vgroup_validmap, vgroup_tot);
           if (me->symmetry & ME_SYMMETRY_X) {
             ED_mesh_defvert_mirror_update_ob(ob, -1, i);
           }
@@ -688,7 +702,7 @@ static const EnumPropertyItem WT_vertex_group_select_item[] = {
      "Deform Pose Bones",
      "All Vertex Groups assigned to Deform Bones"},
     {WT_VGROUP_ALL, "ALL", 0, "All Groups", "All Vertex Groups"},
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 const EnumPropertyItem *ED_object_vgroup_selection_itemf_helper(const bContext *C,
@@ -698,10 +712,10 @@ const EnumPropertyItem *ED_object_vgroup_selection_itemf_helper(const bContext *
                                                                 const uint selection_mask)
 {
   Object *ob;
-  EnumPropertyItem *item = NULL;
+  EnumPropertyItem *item = nullptr;
   int totitem = 0;
 
-  if (C == NULL) {
+  if (C == nullptr) {
     /* needed for docs and i18n tools */
     return WT_vertex_group_select_item;
   }
@@ -797,13 +811,13 @@ static void ED_vgroup_nr_vert_add(
     Object *ob, const int def_nr, const int vertnum, const float weight, const int assignmode)
 {
   /* Add the vert to the deform group with the specified number. */
-  MDeformVert *dvert = NULL;
+  MDeformVert *dvert = nullptr;
   int tot;
 
   /* Get the vert. */
-  BKE_object_defgroup_array_get(ob->data, &dvert, &tot);
+  BKE_object_defgroup_array_get(static_cast<ID *>(ob->data), &dvert, &tot);
 
-  if (dvert == NULL) {
+  if (dvert == nullptr) {
     return;
   }
 
@@ -865,7 +879,7 @@ void ED_vgroup_vert_add(Object *ob, bDeformGroup *dg, int vertnum, float weight,
   const ListBase *defbase = BKE_object_defgroup_list(ob);
   const int def_nr = BLI_findindex(defbase, dg);
 
-  MDeformVert *dv = NULL;
+  MDeformVert *dv = nullptr;
   int tot;
 
   /* get the deform group number, exit if
@@ -875,8 +889,8 @@ void ED_vgroup_vert_add(Object *ob, bDeformGroup *dg, int vertnum, float weight,
 
     /* if there's no deform verts then create some,
      */
-    if (BKE_object_defgroup_array_get(ob->data, &dv, &tot) && dv == NULL) {
-      BKE_object_defgroup_data_create(ob->data);
+    if (BKE_object_defgroup_array_get(static_cast<ID *>(ob->data), &dv, &tot) && dv == nullptr) {
+      BKE_object_defgroup_data_create(static_cast<ID *>(ob->data));
     }
 
     /* call another function to do the work
@@ -891,37 +905,37 @@ void ED_vgroup_vert_remove(Object *ob, bDeformGroup *dg, int vertnum)
    * deform group.
    */
 
-  /* TODO(campbell): This is slow in a loop, better pass def_nr directly,
+  /* TODO(@campbellbarton): This is slow in a loop, better pass def_nr directly,
    * but leave for later. */
   const ListBase *defbase = BKE_object_defgroup_list(ob);
   const int def_nr = BLI_findindex(defbase, dg);
 
   if (def_nr != -1) {
-    MDeformVert *dvert = NULL;
+    MDeformVert *dvert = nullptr;
     int tot;
 
     /* get the deform vertices corresponding to the
      * vertnum
      */
-    BKE_object_defgroup_array_get(ob->data, &dvert, &tot);
+    BKE_object_defgroup_array_get(static_cast<ID *>(ob->data), &dvert, &tot);
 
     if (dvert) {
       MDeformVert *dv = &dvert[vertnum];
       MDeformWeight *dw;
 
       dw = BKE_defvert_find_index(dv, def_nr);
-      BKE_defvert_remove_group(dv, dw); /* dw can be NULL */
+      BKE_defvert_remove_group(dv, dw); /* dw can be nullptr */
     }
   }
 }
 
 static float get_vert_def_nr(Object *ob, const int def_nr, const int vertnum)
 {
-  MDeformVert *dv = NULL;
+  const MDeformVert *dv = nullptr;
 
   /* get the deform vertices corresponding to the vertnum */
   if (ob->type == OB_MESH) {
-    Mesh *me = ob->data;
+    Mesh *me = static_cast<Mesh *>(ob->data);
 
     if (me->edit_mesh) {
       BMEditMesh *em = me->edit_mesh;
@@ -932,18 +946,19 @@ static float get_vert_def_nr(Object *ob, const int def_nr, const int vertnum)
         BMVert *eve;
         BM_mesh_elem_table_ensure(em->bm, BM_VERT);
         eve = BM_vert_at_index(em->bm, vertnum);
-        dv = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+        dv = static_cast<const MDeformVert *>(BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
       }
       else {
         return 0.0f;
       }
     }
     else {
-      if (me->dvert) {
+      const Span<MDeformVert> dverts = me->deform_verts();
+      if (!dverts.is_empty()) {
         if (vertnum >= me->totvert) {
           return 0.0f;
         }
-        dv = &me->dvert[vertnum];
+        dv = &dverts[vertnum];
       }
     }
   }
@@ -1004,7 +1019,7 @@ static void vgroup_select_verts(Object *ob, int select)
   }
 
   if (ob->type == OB_MESH) {
-    Mesh *me = ob->data;
+    Mesh *me = static_cast<Mesh *>(ob->data);
 
     if (me->edit_mesh) {
       BMEditMesh *em = me->edit_mesh;
@@ -1016,7 +1031,8 @@ static void vgroup_select_verts(Object *ob, int select)
 
         BM_ITER_MESH (eve, &iter, em->bm, BM_VERTS_OF_MESH) {
           if (!BM_elem_flag_test(eve, BM_ELEM_HIDDEN)) {
-            MDeformVert *dv = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+            MDeformVert *dv = static_cast<MDeformVert *>(
+                BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
             if (BKE_defvert_find_index(dv, def_nr)) {
               BM_vert_select_set(em->bm, eve, select);
             }
@@ -1033,17 +1049,18 @@ static void vgroup_select_verts(Object *ob, int select)
       }
     }
     else {
-      if (me->dvert) {
+      const Span<MDeformVert> dverts = me->deform_verts();
+      if (!dverts.is_empty()) {
+        const bool *hide_vert = (const bool *)CustomData_get_layer_named(
+            &me->vdata, CD_PROP_BOOL, ".hide_vert");
         MVert *mv;
-        MDeformVert *dv;
         int i;
 
-        mv = me->mvert;
-        dv = me->dvert;
+        mv = me->verts_for_write().data();
 
-        for (i = 0; i < me->totvert; i++, mv++, dv++) {
-          if (!(mv->flag & ME_HIDE)) {
-            if (BKE_defvert_find_index(dv, def_nr)) {
+        for (i = 0; i < me->totvert; i++, mv++) {
+          if (!(hide_vert != nullptr && hide_vert[i])) {
+            if (BKE_defvert_find_index(&dverts[i], def_nr)) {
               if (select) {
                 mv->flag |= SELECT;
               }
@@ -1091,12 +1108,13 @@ static void vgroup_duplicate(Object *ob)
   bDeformGroup *dg, *cdg;
   char name[sizeof(dg->name)];
   MDeformWeight *dw_org, *dw_cpy;
-  MDeformVert **dvert_array = NULL;
+  MDeformVert **dvert_array = nullptr;
   int i, idg, icdg, dvert_tot = 0;
 
   ListBase *defbase = BKE_object_defgroup_list_mutable(ob);
 
-  dg = BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1);
+  dg = static_cast<bDeformGroup *>(
+      BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1));
   if (!dg) {
     return;
   }
@@ -1118,8 +1136,8 @@ static void vgroup_duplicate(Object *ob)
   BKE_object_defgroup_active_index_set(ob, BLI_listbase_count(defbase));
   icdg = BKE_object_defgroup_active_index_get(ob) - 1;
 
-  /* TODO(campbell): we might want to allow only copy selected verts here? */
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, false);
+  /* TODO(@campbellbarton): we might want to allow only copy selected verts here? */
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, false);
 
   if (dvert_array) {
     for (i = 0; i < dvert_tot; i++) {
@@ -1140,7 +1158,7 @@ static void vgroup_duplicate(Object *ob)
 static bool vgroup_normalize(Object *ob)
 {
   MDeformWeight *dw;
-  MDeformVert *dv, **dvert_array = NULL;
+  MDeformVert *dv, **dvert_array = nullptr;
   int dvert_tot = 0;
   const int def_nr = BKE_object_defgroup_active_index_get(ob) - 1;
 
@@ -1151,7 +1169,7 @@ static bool vgroup_normalize(Object *ob)
     return false;
   }
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     float weight_max = 0.0f;
@@ -1198,21 +1216,18 @@ static bool vgroup_normalize(Object *ob)
 /* This finds all of the vertices face-connected to vert by an edge and returns a
  * MEM_allocated array of indices of size count.
  * count is an int passed by reference so it can be assigned the value of the length here. */
-static int *getSurroundingVerts(Mesh *me, int vert, int *count)
+static blender::Vector<int> getSurroundingVerts(Mesh *me, int vert)
 {
-  MPoly *mp = me->mpoly;
+  const MPoly *mp = me->polys().data();
+  const MLoop *loops = me->loops().data();
   int i = me->totpoly;
-  /* Instead of looping twice on all polys and loops, and use a temp array, let's rather
-   * use a BLI_array, with a reasonable starting/reserved size (typically, there are not
-   * many vertices face-linked to another one, even 8 might be too high...). */
-  int *verts = NULL;
-  BLI_array_declare(verts);
 
-  BLI_array_reserve(verts, 8);
+  blender::Vector<int> verts;
+
   while (i--) {
     int j = mp->totloop;
     int first_l = mp->totloop - 1;
-    MLoop *ml = &me->mloop[mp->loopstart];
+    const MLoop *ml = &loops[mp->loopstart];
     while (j--) {
       /* XXX This assume a vert can only be once in a poly, even though
        *     it seems logical to me, not totally sure of that. */
@@ -1226,7 +1241,7 @@ static int *getSurroundingVerts(Mesh *me, int vert, int *count)
         else if (!j) {
           /* We are on the last corner. */
           a = (ml - 1)->v;
-          b = me->mloop[mp->loopstart].v;
+          b = loops[mp->loopstart].v;
         }
         else {
           a = (ml - 1)->v;
@@ -1234,7 +1249,7 @@ static int *getSurroundingVerts(Mesh *me, int vert, int *count)
         }
 
         /* Append a and b verts to array, if not yet present. */
-        k = BLI_array_len(verts);
+        k = verts.size();
         /* XXX Maybe a == b is enough? */
         while (k-- && !(a == b && a == -1)) {
           if (verts[k] == a) {
@@ -1245,10 +1260,10 @@ static int *getSurroundingVerts(Mesh *me, int vert, int *count)
           }
         }
         if (a != -1) {
-          BLI_array_append(verts, a);
+          verts.append(a);
         }
         if (b != -1) {
-          BLI_array_append(verts, b);
+          verts.append(b);
         }
 
         /* Vert found in this poly, we can go to next one! */
@@ -1259,8 +1274,6 @@ static int *getSurroundingVerts(Mesh *me, int vert, int *count)
     mp++;
   }
 
-  /* Do not free the array! */
-  *count = BLI_array_len(verts);
   return verts;
 }
 
@@ -1311,14 +1324,15 @@ static void getVerticalAndHorizontalChange(const float norm[3],
   changes[index][1] = len_v3v3(projA, projB);
 }
 
-/* by changing nonzero weights, try to move a vertex in me->mverts with index 'index' to
- * distToBe distance away from the provided plane strength can change distToBe so that it moves
- * towards distToBe by that percentage cp changes how much the weights are adjusted
+/**
+ * By changing nonzero weights, try to move a vertex in `me->mverts` with index 'index' to
+ * `distToBe` distance away from the provided plane strength can change `distToBe` so that it moves
+ * towards `distToBe` by that percentage `cp` changes how much the weights are adjusted
  * to check the distance
  *
- * index is the index of the vertex being moved
- * norm and d are the plane's properties for the equation: ax + by + cz + d = 0
- * coord is a point on the plane
+ * `index` is the index of the vertex being moved.
+ * `norm` and `d` are the plane's properties for the equation: `ax + by + cz + d = 0`.
+ * `coord` is a point on the plane.
  */
 static void moveCloserToDistanceFromPlane(Depsgraph *depsgraph,
                                           Scene *UNUSED(scene),
@@ -1339,20 +1353,21 @@ static void moveCloserToDistanceFromPlane(Depsgraph *depsgraph,
   Mesh *me_deform;
   MDeformWeight *dw, *dw_eval;
   MVert m;
-  MDeformVert *dvert = me->dvert + index;
-  MDeformVert *dvert_eval = mesh_eval->dvert + index;
+  MDeformVert *dvert = me->deform_verts_for_write().data() + index;
+  MDeformVert *dvert_eval = mesh_eval->deform_verts_for_write().data() + index;
   int totweight = dvert->totweight;
   float oldw = 0;
   float oldPos[3] = {0};
   float vc, hc, dist = 0.0f;
   int i, k;
-  float(*changes)[2] = MEM_mallocN(sizeof(float[2]) * totweight, "vertHorzChange");
-  float *dists = MEM_mallocN(sizeof(float) * totweight, "distance");
+  float(*changes)[2] = static_cast<float(*)[2]>(
+      MEM_mallocN(sizeof(float[2]) * totweight, "vertHorzChange"));
+  float *dists = static_cast<float *>(MEM_mallocN(sizeof(float) * totweight, "distance"));
 
   /* track if up or down moved it closer for each bone */
-  bool *upDown = MEM_callocN(sizeof(bool) * totweight, "upDownTracker");
+  bool *upDown = static_cast<bool *>(MEM_callocN(sizeof(bool) * totweight, "upDownTracker"));
 
-  int *dwIndices = MEM_callocN(sizeof(int) * totweight, "dwIndexTracker");
+  int *dwIndices = static_cast<int *>(MEM_callocN(sizeof(int) * totweight, "dwIndexTracker"));
   float distToStart;
   int bestIndex = 0;
   bool wasChange;
@@ -1362,7 +1377,8 @@ static void moveCloserToDistanceFromPlane(Depsgraph *depsgraph,
   do {
     wasChange = false;
     me_deform = mesh_get_eval_deform(depsgraph, scene_eval, object_eval, &CD_MASK_BAREMESH);
-    m = me_deform->mvert[index];
+    const Span<MVert> verts = me_deform->verts();
+    m = verts[index];
     copy_v3_v3(oldPos, m.co);
     distToStart = dot_v3v3(norm, oldPos) + d;
 
@@ -1404,7 +1420,7 @@ static void moveCloserToDistanceFromPlane(Depsgraph *depsgraph,
         }
         dw_eval->weight = dw->weight;
         me_deform = mesh_get_eval_deform(depsgraph, scene_eval, object_eval, &CD_MASK_BAREMESH);
-        m = me_deform->mvert[index];
+        m = verts[index];
         getVerticalAndHorizontalChange(
             norm, d, coord, oldPos, distToStart, m.co, changes, dists, i);
         dw->weight = oldw;
@@ -1508,25 +1524,26 @@ static void vgroup_fix(
   Object *object_eval = DEG_get_evaluated_object(depsgraph, ob);
   int i;
 
-  Mesh *me = ob->data;
-  MVert *mvert = me->mvert;
-  int *verts = NULL;
+  Mesh *me = static_cast<Mesh *>(ob->data);
+  MVert *mvert = me->verts_for_write().data();
   if (!(me->editflag & ME_EDIT_PAINT_VERT_SEL)) {
     return;
   }
   for (i = 0; i < me->totvert && mvert; i++, mvert++) {
     if (mvert->flag & SELECT) {
-      int count = 0;
-      if ((verts = getSurroundingVerts(me, i, &count))) {
+      blender::Vector<int> verts = getSurroundingVerts(me, i);
+      const int count = verts.size();
+      if (!verts.is_empty()) {
         MVert m;
-        MVert *p = MEM_callocN(sizeof(MVert) * (count), "deformedPoints");
+        MVert *p = static_cast<MVert *>(MEM_callocN(sizeof(MVert) * (count), "deformedPoints"));
         int k;
 
         Mesh *me_deform = mesh_get_eval_deform(
             depsgraph, scene_eval, object_eval, &CD_MASK_BAREMESH);
+        const Span<MVert> verts_deform = me_deform->verts();
         k = count;
         while (k--) {
-          p[k] = me_deform->mvert[verts[k]];
+          p[k] = verts_deform[verts[k]];
         }
 
         if (count >= 3) {
@@ -1534,7 +1551,7 @@ static void vgroup_fix(
           float coord[3];
           float norm[3];
           getSingleCoordinate(p, count, coord);
-          m = me_deform->mvert[i];
+          m = verts_deform[i];
           sub_v3_v3v3(norm, m.co, coord);
           mag = normalize_v3(norm);
           if (mag) { /* zeros fix */
@@ -1545,7 +1562,6 @@ static void vgroup_fix(
           }
         }
 
-        MEM_freeN(verts);
         MEM_freeN(p);
       }
     }
@@ -1560,7 +1576,7 @@ static void vgroup_levels_subset(Object *ob,
                                  const float gain)
 {
   MDeformWeight *dw;
-  MDeformVert *dv, **dvert_array = NULL;
+  MDeformVert *dv, **dvert_array = nullptr;
   int dvert_tot = 0;
 
   const bool use_vert_sel = vertex_group_use_vert_sel(ob);
@@ -1568,7 +1584,7 @@ static void vgroup_levels_subset(Object *ob,
                               (((Mesh *)ob->data)->symmetry & ME_SYMMETRY_X) != 0 :
                               false;
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
 
@@ -1606,7 +1622,7 @@ static bool vgroup_normalize_all(Object *ob,
                                  const bool lock_active,
                                  ReportList *reports)
 {
-  MDeformVert *dv, **dvert_array = NULL;
+  MDeformVert *dv, **dvert_array = nullptr;
   int i, dvert_tot = 0;
   const int def_nr = BKE_object_defgroup_active_index_get(ob) - 1;
 
@@ -1617,7 +1633,7 @@ static bool vgroup_normalize_all(Object *ob,
     return false;
   }
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     const ListBase *defbase = BKE_object_defgroup_list(ob);
@@ -1625,7 +1641,7 @@ static bool vgroup_normalize_all(Object *ob,
     bool *lock_flags = BKE_object_defgroup_lock_flags_get(ob, defbase_tot);
     bool changed = false;
 
-    if ((lock_active == true) && (lock_flags != NULL) && (def_nr < defbase_tot)) {
+    if ((lock_active == true) && (lock_flags != nullptr) && (def_nr < defbase_tot)) {
       lock_flags[def_nr] = true;
     }
 
@@ -1688,7 +1704,7 @@ static const EnumPropertyItem vgroup_lock_actions[] = {
     {VGROUP_LOCK, "LOCK", 0, "Lock", "Lock all vertex groups"},
     {VGROUP_UNLOCK, "UNLOCK", 0, "Unlock", "Unlock all vertex groups"},
     {VGROUP_INVERT, "INVERT", 0, "Invert", "Invert the lock state of all vertex groups"},
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 enum {
@@ -1707,7 +1723,7 @@ static const EnumPropertyItem vgroup_lock_mask[] = {
      0,
      "Invert Unselected",
      "Apply the opposite of Lock/Unlock to unselected vertex groups"},
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 static bool *vgroup_selected_get(Object *ob)
@@ -1726,7 +1742,7 @@ static bool *vgroup_selected_get(Object *ob)
     }
   }
   else {
-    mask = MEM_callocN(defbase_tot * sizeof(bool), __func__);
+    mask = static_cast<bool *>(MEM_callocN(defbase_tot * sizeof(bool), __func__));
   }
 
   const int actdef = BKE_object_defgroup_active_index_get(ob);
@@ -1740,7 +1756,7 @@ static bool *vgroup_selected_get(Object *ob)
 static void vgroup_lock_all(Object *ob, int action, int mask)
 {
   bDeformGroup *dg;
-  bool *selected = NULL;
+  bool *selected = nullptr;
   int i;
 
   if (mask != VGROUP_MASK_ALL) {
@@ -1751,7 +1767,7 @@ static void vgroup_lock_all(Object *ob, int action, int mask)
   if (action == VGROUP_TOGGLE) {
     action = VGROUP_LOCK;
 
-    for (dg = defbase->first, i = 0; dg; dg = dg->next, i++) {
+    for (dg = static_cast<bDeformGroup *>(defbase->first), i = 0; dg; dg = dg->next, i++) {
       switch (mask) {
         case VGROUP_MASK_INVERT_UNSELECTED:
         case VGROUP_MASK_SELECTED:
@@ -1764,7 +1780,8 @@ static void vgroup_lock_all(Object *ob, int action, int mask)
             continue;
           }
           break;
-        default:;
+        default:
+          break;
       }
 
       if (dg->flag & DG_LOCK_WEIGHT) {
@@ -1774,7 +1791,7 @@ static void vgroup_lock_all(Object *ob, int action, int mask)
     }
   }
 
-  for (dg = defbase->first, i = 0; dg; dg = dg->next, i++) {
+  for (dg = static_cast<bDeformGroup *>(defbase->first), i = 0; dg; dg = dg->next, i++) {
     switch (mask) {
       case VGROUP_MASK_SELECTED:
         if (!selected[i]) {
@@ -1786,7 +1803,8 @@ static void vgroup_lock_all(Object *ob, int action, int mask)
           continue;
         }
         break;
-      default:;
+      default:
+        break;
     }
 
     switch (action) {
@@ -1819,14 +1837,14 @@ static void vgroup_invert_subset(Object *ob,
                                  const bool auto_remove)
 {
   MDeformWeight *dw;
-  MDeformVert *dv, **dvert_array = NULL;
+  MDeformVert *dv, **dvert_array = nullptr;
   int dvert_tot = 0;
   const bool use_vert_sel = vertex_group_use_vert_sel(ob);
   const bool use_mirror = (ob->type == OB_MESH) ?
                               (((Mesh *)ob->data)->symmetry & ME_SYMMETRY_X) != 0 :
                               false;
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     for (int i = 0; i < dvert_tot; i++) {
@@ -1876,10 +1894,10 @@ static void vgroup_smooth_subset(Object *ob,
                                  const float fac_expand)
 {
   const float ifac = 1.0f - fac;
-  MDeformVert **dvert_array = NULL;
+  MDeformVert **dvert_array = nullptr;
   int dvert_tot = 0;
-  int *vgroup_subset_map = BLI_array_alloca(vgroup_subset_map, subset_count);
-  float *vgroup_subset_weights = BLI_array_alloca(vgroup_subset_weights, subset_count);
+  blender::Array<int, 32> vgroup_subset_map(subset_count);
+  blender::Array<float, 32> vgroup_subset_weights(subset_count);
   const bool use_mirror = (ob->type == OB_MESH) ?
                               (((Mesh *)ob->data)->symmetry & ME_SYMMETRY_X) != 0 :
                               false;
@@ -1891,8 +1909,8 @@ static void vgroup_smooth_subset(Object *ob,
   const float iexpand = 1.0f - expand;
 
   BMEditMesh *em = BKE_editmesh_from_object(ob);
-  BMesh *bm = em ? em->bm : NULL;
-  Mesh *me = em ? NULL : ob->data;
+  BMesh *bm = em ? em->bm : nullptr;
+  Mesh *me = em ? nullptr : static_cast<Mesh *>(ob->data);
 
   MeshElemMap *emap;
   int *emap_mem;
@@ -1906,31 +1924,37 @@ static void vgroup_smooth_subset(Object *ob,
   uint *verts_used;
   STACK_DECLARE(verts_used);
 
-  BKE_object_defgroup_subset_to_index_array(vgroup_validmap, vgroup_tot, vgroup_subset_map);
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, false);
-  memset(vgroup_subset_weights, 0, sizeof(*vgroup_subset_weights) * subset_count);
+  BKE_object_defgroup_subset_to_index_array(vgroup_validmap, vgroup_tot, vgroup_subset_map.data());
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, false);
+  vgroup_subset_weights.fill(0.0f);
 
   if (bm) {
     BM_mesh_elem_table_ensure(bm, BM_VERT);
     BM_mesh_elem_index_ensure(bm, BM_VERT);
 
-    emap = NULL;
-    emap_mem = NULL;
+    emap = nullptr;
+    emap_mem = nullptr;
   }
   else {
-    BKE_mesh_vert_edge_map_create(&emap, &emap_mem, me->medge, me->totvert, me->totedge);
+    BKE_mesh_vert_edge_map_create(&emap, &emap_mem, me->edges().data(), me->totvert, me->totedge);
   }
 
-  weight_accum_prev = MEM_mallocN(sizeof(*weight_accum_prev) * dvert_tot, __func__);
-  weight_accum_curr = MEM_mallocN(sizeof(*weight_accum_curr) * dvert_tot, __func__);
+  weight_accum_prev = static_cast<float *>(
+      MEM_mallocN(sizeof(*weight_accum_prev) * dvert_tot, __func__));
+  weight_accum_curr = static_cast<float *>(
+      MEM_mallocN(sizeof(*weight_accum_curr) * dvert_tot, __func__));
 
-  verts_used = MEM_mallocN(sizeof(*verts_used) * dvert_tot, __func__);
+  verts_used = static_cast<uint *>(MEM_mallocN(sizeof(*verts_used) * dvert_tot, __func__));
   STACK_INIT(verts_used, dvert_tot);
 
 #define IS_BM_VERT_READ(v) (use_hide ? (BM_elem_flag_test(v, BM_ELEM_HIDDEN) == 0) : true)
 #define IS_BM_VERT_WRITE(v) (use_select ? (BM_elem_flag_test(v, BM_ELEM_SELECT) != 0) : true)
 
-#define IS_ME_VERT_READ(v) (use_hide ? (((v)->flag & ME_HIDE) == 0) : true)
+  const bool *hide_vert = me ? (const bool *)CustomData_get_layer_named(
+                                   &me->vdata, CD_PROP_BOOL, ".hide_vert") :
+                               nullptr;
+
+#define IS_ME_VERT_READ(v) (use_hide ? !(hide_vert && hide_vert[v]) : true)
 #define IS_ME_VERT_WRITE(v) (use_select ? (((v)->flag & SELECT) != 0) : true)
 
   /* initialize used verts */
@@ -1951,13 +1975,15 @@ static void vgroup_smooth_subset(Object *ob,
     }
   }
   else {
+    const Span<MVert> verts = me->verts();
+    const blender::Span<MEdge> edges = me->edges();
     for (int i = 0; i < dvert_tot; i++) {
-      const MVert *v = &me->mvert[i];
+      const MVert *v = &verts[i];
       if (IS_ME_VERT_WRITE(v)) {
         for (int j = 0; j < emap[i].count; j++) {
-          const MEdge *e = &me->medge[emap[i].indices[j]];
-          const MVert *v_other = &me->mvert[(e->v1 == i) ? e->v2 : e->v1];
-          if (IS_ME_VERT_READ(v_other)) {
+          const MEdge *e = &edges[emap[i].indices[j]];
+          const int i_other = (e->v1 == i) ? e->v2 : e->v1;
+          if (IS_ME_VERT_READ(i_other)) {
             STACK_PUSH(verts_used, i);
             break;
           }
@@ -2024,16 +2050,15 @@ static void vgroup_smooth_subset(Object *ob,
         }
         else {
           int j;
+          const blender::Span<MEdge> edges = me->edges();
 
           /* checked already */
-          BLI_assert(IS_ME_VERT_WRITE(&me->mvert[i]));
+          BLI_assert(IS_ME_VERT_WRITE(&me->verts()[i]));
 
           for (j = 0; j < emap[i].count; j++) {
-            MEdge *e = &me->medge[emap[i].indices[j]];
+            const MEdge *e = &edges[emap[i].indices[j]];
             const int i_other = (e->v1 == i ? e->v2 : e->v1);
-            MVert *v_other = &me->mvert[i_other];
-
-            if (IS_ME_VERT_READ(v_other)) {
+            if (IS_ME_VERT_READ(i_other)) {
               WEIGHT_ACCUMULATE;
             }
           }
@@ -2078,9 +2103,9 @@ static void vgroup_smooth_subset(Object *ob,
     MEM_freeN(dvert_array);
   }
 
-  /* not so efficient to get 'dvert_array' again just so unselected verts are NULL'd */
+  /* not so efficient to get 'dvert_array' again just so unselected verts are nullptr'd */
   if (use_mirror) {
-    ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, true);
+    ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, true);
     ED_vgroup_parray_mirror_sync(ob, dvert_array, dvert_tot, vgroup_validmap, vgroup_tot);
     if (dvert_array) {
       MEM_freeN(dvert_array);
@@ -2096,7 +2121,8 @@ static int inv_cmp_mdef_vert_weights(const void *a1, const void *a2)
    * less than, equal to, or greater than zero corresponding to whether its first argument is
    * considered less than, equal to, or greater than its second argument.
    * This does the opposite. */
-  const struct MDeformWeight *dw1 = a1, *dw2 = a2;
+  const MDeformWeight *dw1 = static_cast<const MDeformWeight *>(a1);
+  const MDeformWeight *dw2 = static_cast<const MDeformWeight *>(a2);
 
   if (dw1->weight < dw2->weight) {
     return 1;
@@ -2120,12 +2146,12 @@ static int vgroup_limit_total_subset(Object *ob,
                                      const int subset_count,
                                      const int max_weights)
 {
-  MDeformVert *dv, **dvert_array = NULL;
+  MDeformVert *dv, **dvert_array = nullptr;
   int i, dvert_tot = 0;
   const bool use_vert_sel = vertex_group_use_vert_sel(ob);
   int remove_tot = 0;
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     int num_to_drop = 0;
@@ -2147,7 +2173,8 @@ static int vgroup_limit_total_subset(Object *ob,
       if (num_to_drop > 0) {
         /* re-pack dw array so that non-bone weights are first, bone-weighted verts at end
          * sort the tail, then copy only the truncated array back to dv->dw */
-        dw_temp = MEM_mallocN(sizeof(MDeformWeight) * dv->totweight, __func__);
+        dw_temp = static_cast<MDeformWeight *>(
+            MEM_mallocN(sizeof(MDeformWeight) * dv->totweight, __func__));
         bone_count = 0;
         non_bone_count = 0;
         for (j = 0; j < dv->totweight; j++) {
@@ -2170,7 +2197,8 @@ static int vgroup_limit_total_subset(Object *ob,
           dv->totweight -= num_to_drop;
           /* Do we want to clean/normalize here? */
           MEM_freeN(dv->dw);
-          dv->dw = MEM_reallocN(dw_temp, sizeof(MDeformWeight) * dv->totweight);
+          dv->dw = static_cast<MDeformWeight *>(
+              MEM_reallocN(dw_temp, sizeof(MDeformWeight) * dv->totweight));
           remove_tot += num_to_drop;
         }
         else {
@@ -2191,14 +2219,14 @@ static void vgroup_clean_subset(Object *ob,
                                 const float epsilon,
                                 const bool keep_single)
 {
-  MDeformVert **dvert_array = NULL;
+  MDeformVert **dvert_array = nullptr;
   int dvert_tot = 0;
   const bool use_vert_sel = vertex_group_use_vert_sel(ob);
   const bool use_mirror = (ob->type == OB_MESH) ?
                               (((Mesh *)ob->data)->symmetry & ME_SYMMETRY_X) != 0 :
                               false;
 
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     if (use_mirror && use_vert_sel) {
@@ -2221,13 +2249,13 @@ static void vgroup_quantize_subset(Object *ob,
                                    const int UNUSED(subset_count),
                                    const int steps)
 {
-  MDeformVert **dvert_array = NULL;
+  MDeformVert **dvert_array = nullptr;
   int dvert_tot = 0;
   const bool use_vert_sel = vertex_group_use_vert_sel(ob);
   const bool use_mirror = (ob->type == OB_MESH) ?
                               (((Mesh *)ob->data)->symmetry & ME_SYMMETRY_X) != 0 :
                               false;
-  ED_vgroup_parray_alloc(ob->data, &dvert_array, &dvert_tot, use_vert_sel);
+  ED_vgroup_parray_alloc(static_cast<ID *>(ob->data), &dvert_array, &dvert_tot, use_vert_sel);
 
   if (dvert_array) {
     const float steps_fl = steps;
@@ -2348,9 +2376,9 @@ void ED_vgroup_mirror(Object *ob,
                   def_nr)
 
   BMVert *eve, *eve_mirr;
-  MDeformVert *dvert, *dvert_mirr;
+  MDeformVert *dvert_mirr;
   char sel, sel_mirr;
-  int *flip_map = NULL, flip_map_len;
+  int *flip_map = nullptr, flip_map_len;
   const int def_nr = BKE_object_defgroup_active_index_get(ob) - 1;
   int totmirr = 0, totfail = 0;
 
@@ -2359,29 +2387,29 @@ void ED_vgroup_mirror(Object *ob,
   const ListBase *defbase = BKE_object_defgroup_list(ob);
 
   if ((mirror_weights == false && flip_vgroups == false) ||
-      (BLI_findlink(defbase, def_nr) == NULL)) {
+      (BLI_findlink(defbase, def_nr) == nullptr)) {
     return;
   }
 
   if (flip_vgroups) {
-    flip_map = all_vgroups ? BKE_object_defgroup_flip_map(ob, &flip_map_len, false) :
-                             BKE_object_defgroup_flip_map_single(ob, &flip_map_len, false, def_nr);
+    flip_map = all_vgroups ? BKE_object_defgroup_flip_map(ob, false, &flip_map_len) :
+                             BKE_object_defgroup_flip_map_single(ob, false, def_nr, &flip_map_len);
 
-    BLI_assert(flip_map != NULL);
+    BLI_assert(flip_map != nullptr);
 
-    if (flip_map == NULL) {
+    if (flip_map == nullptr) {
       /* something went wrong!, possibly no groups */
       return;
     }
   }
   else {
-    flip_map = NULL;
+    flip_map = nullptr;
     flip_map_len = 0;
   }
 
   /* only the active group */
   if (ob->type == OB_MESH) {
-    Mesh *me = ob->data;
+    Mesh *me = static_cast<Mesh *>(ob->data);
     BMEditMesh *em = me->edit_mesh;
 
     if (em) {
@@ -2406,8 +2434,10 @@ void ED_vgroup_mirror(Object *ob,
                 sel_mirr = BM_elem_flag_test(eve_mirr, BM_ELEM_SELECT);
 
                 if ((sel || sel_mirr) && (eve != eve_mirr)) {
-                  dvert = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
-                  dvert_mirr = BM_ELEM_CD_GET_VOID_P(eve_mirr, cd_dvert_offset);
+                  MDeformVert *dvert = static_cast<MDeformVert *>(
+                      BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
+                  dvert_mirr = static_cast<MDeformVert *>(
+                      BM_ELEM_CD_GET_VOID_P(eve_mirr, cd_dvert_offset));
 
                   VGROUP_MIRR_OP;
                   totmirr++;
@@ -2428,11 +2458,11 @@ void ED_vgroup_mirror(Object *ob,
     }
     else {
       /* object mode / weight paint */
-      MVert *mv, *mv_mirr;
+      const MVert *mv, *mv_mirr;
       int vidx, vidx_mirr;
       const bool use_vert_sel = (me->editflag & ME_EDIT_PAINT_VERT_SEL) != 0;
 
-      if (me->dvert == NULL) {
+      if (me->deform_verts().is_empty()) {
         goto cleanup;
       }
 
@@ -2441,12 +2471,14 @@ void ED_vgroup_mirror(Object *ob,
       }
 
       BLI_bitmap *vert_tag = BLI_BITMAP_NEW(me->totvert, __func__);
+      const MVert *verts = me->verts().data();
+      MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
 
-      for (vidx = 0, mv = me->mvert; vidx < me->totvert; vidx++, mv++) {
+      for (vidx = 0, mv = verts; vidx < me->totvert; vidx++, mv++) {
         if (!BLI_BITMAP_TEST(vert_tag, vidx)) {
-          if ((vidx_mirr = mesh_get_x_mirror_vert(ob, NULL, vidx, use_topology)) != -1) {
+          if ((vidx_mirr = mesh_get_x_mirror_vert(ob, nullptr, vidx, use_topology)) != -1) {
             if (vidx != vidx_mirr) {
-              mv_mirr = &me->mvert[vidx_mirr];
+              mv_mirr = &verts[vidx_mirr];
               if (!BLI_BITMAP_TEST(vert_tag, vidx_mirr)) {
 
                 if (use_vert_sel) {
@@ -2455,8 +2487,8 @@ void ED_vgroup_mirror(Object *ob,
                 }
 
                 if (sel || sel_mirr) {
-                  dvert = &me->dvert[vidx];
-                  dvert_mirr = &me->dvert[vidx_mirr];
+                  MDeformVert *dvert = &dverts[vidx];
+                  dvert_mirr = &dvert[vidx_mirr];
 
                   VGROUP_MIRR_OP;
                   totmirr++;
@@ -2483,7 +2515,7 @@ void ED_vgroup_mirror(Object *ob,
     int pntsu_half;
     /* half but found up odd value */
 
-    if (lt->pntsu == 1 || lt->dvert == NULL) {
+    if (lt->pntsu == 1 || lt->dvert == nullptr) {
       goto cleanup;
     }
 
@@ -2509,7 +2541,7 @@ void ED_vgroup_mirror(Object *ob,
             sel_mirr = bp_mirr->f1 & SELECT;
 
             if (sel || sel_mirr) {
-              dvert = &lt->dvert[i1];
+              MDeformVert *dvert = &lt->dvert[i1];
               dvert_mirr = &lt->dvert[i2];
 
               VGROUP_MIRR_OP;
@@ -2543,7 +2575,8 @@ cleanup:
 static void vgroup_delete_active(Object *ob)
 {
   const ListBase *defbase = BKE_object_defgroup_list(ob);
-  bDeformGroup *dg = BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1);
+  bDeformGroup *dg = static_cast<bDeformGroup *>(
+      BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1));
   if (!dg) {
     return;
   }
@@ -2562,7 +2595,7 @@ static void vgroup_assign_verts(Object *ob, const float weight)
   }
 
   if (ob->type == OB_MESH) {
-    Mesh *me = ob->data;
+    Mesh *me = static_cast<Mesh *>(ob->data);
 
     if (me->edit_mesh) {
       BMEditMesh *em = me->edit_mesh;
@@ -2582,7 +2615,8 @@ static void vgroup_assign_verts(Object *ob, const float weight)
         if (BM_elem_flag_test(eve, BM_ELEM_SELECT)) {
           MDeformVert *dv;
           MDeformWeight *dw;
-          dv = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset); /* can be NULL */
+          dv = static_cast<MDeformVert *>(
+              BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset)); /* can be nullptr */
           dw = BKE_defvert_ensure_index(dv, def_nr);
           if (dw) {
             dw->weight = weight;
@@ -2591,14 +2625,12 @@ static void vgroup_assign_verts(Object *ob, const float weight)
       }
     }
     else {
-      if (!me->dvert) {
-        BKE_object_defgroup_data_create(&me->id);
-      }
+      const Span<MVert> verts = me->verts();
+      MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
+      MDeformVert *dv = dverts.data();
 
-      MVert *mv = me->mvert;
-      MDeformVert *dv = me->dvert;
-
-      for (int i = 0; i < me->totvert; i++, mv++, dv++) {
+      for (int i = 0; i < me->totvert; i++, dv++) {
+        const MVert *mv = &verts[i];
         if (mv->flag & SELECT) {
           MDeformWeight *dw;
           dw = BKE_defvert_ensure_index(dv, def_nr);
@@ -2615,7 +2647,7 @@ static void vgroup_assign_verts(Object *ob, const float weight)
     BPoint *bp;
     int a, tot;
 
-    if (lt->dvert == NULL) {
+    if (lt->dvert == nullptr) {
       BKE_object_defgroup_data_create(&lt->id);
     }
 
@@ -2654,8 +2686,8 @@ static bool vertex_group_supported_poll_ex(bContext *C, const Object *ob)
   }
 
   /* Data checks. */
-  const ID *data = ob->data;
-  if (data == NULL || ID_IS_LINKED(data) || ID_IS_OVERRIDE_LIBRARY(data)) {
+  const ID *data = static_cast<const ID *>(ob->data);
+  if (data == nullptr || ID_IS_LINKED(data) || ID_IS_OVERRIDE_LIBRARY(data)) {
     CTX_wm_operator_poll_msg_set(C, "Object type \"%s\" does not have editable data");
     return false;
   }
@@ -2711,8 +2743,8 @@ static bool vertex_group_mesh_with_dvert_poll(bContext *C)
     return false;
   }
 
-  Mesh *me = ob->data;
-  if (me->dvert == NULL) {
+  Mesh *me = static_cast<Mesh *>(ob->data);
+  if (me->deform_verts().is_empty()) {
     CTX_wm_operator_poll_msg_set(C, "The active mesh object has no vertex group data");
     return false;
   }
@@ -2802,7 +2834,7 @@ static bool vertex_group_vert_select_unlocked_poll(bContext *C)
   const int def_nr = BKE_object_defgroup_active_index_get(ob);
   if (def_nr != 0) {
     const ListBase *defbase = BKE_object_defgroup_list(ob);
-    const bDeformGroup *dg = BLI_findlink(defbase, def_nr - 1);
+    const bDeformGroup *dg = static_cast<const bDeformGroup *>(BLI_findlink(defbase, def_nr - 1));
     if (dg) {
       return !(dg->flag & DG_LOCK_WEIGHT);
     }
@@ -2906,10 +2938,10 @@ void OBJECT_OT_vertex_group_remove(wmOperatorType *ot)
   ot->flag = /*OPTYPE_REGISTER|*/ OPTYPE_UNDO;
 
   /* properties */
-  PropertyRNA *prop = RNA_def_boolean(ot->srna, "all", 0, "All", "Remove all vertex groups");
+  PropertyRNA *prop = RNA_def_boolean(ot->srna, "all", false, "All", "Remove all vertex groups");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
   prop = RNA_def_boolean(
-      ot->srna, "all_unlocked", 0, "All Unlocked", "Remove all unlocked vertex groups");
+      ot->srna, "all_unlocked", false, "All Unlocked", "Remove all unlocked vertex groups");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
 
@@ -3004,8 +3036,9 @@ static int vertex_group_remove_from_exec(bContext *C, wmOperator *op)
   }
   else {
     const ListBase *defbase = BKE_object_defgroup_list(ob);
-    bDeformGroup *dg = BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1);
-    if ((dg == NULL) || (BKE_object_defgroup_clear(ob, dg, !use_all_verts) == false)) {
+    bDeformGroup *dg = static_cast<bDeformGroup *>(
+        BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1));
+    if ((dg == nullptr) || (BKE_object_defgroup_clear(ob, dg, !use_all_verts) == false)) {
       return OPERATOR_CANCELLED;
     }
   }
@@ -3035,9 +3068,11 @@ void OBJECT_OT_vertex_group_remove_from(wmOperatorType *ot)
   ot->flag = /*OPTYPE_REGISTER|*/ OPTYPE_UNDO;
 
   /* properties */
-  prop = RNA_def_boolean(ot->srna, "use_all_groups", 0, "All Groups", "Remove from all groups");
+  prop = RNA_def_boolean(
+      ot->srna, "use_all_groups", false, "All Groups", "Remove from all groups");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "use_all_verts", 0, "All Vertices", "Clear the active group");
+  prop = RNA_def_boolean(
+      ot->srna, "use_all_verts", false, "All Vertices", "Clear the active group");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
 
@@ -3056,7 +3091,7 @@ static int vertex_group_select_exec(bContext *C, wmOperator *UNUSED(op))
   }
 
   vgroup_select_verts(ob, 1);
-  DEG_id_tag_update(ob->data, ID_RECALC_COPY_ON_WRITE | ID_RECALC_SELECT);
+  DEG_id_tag_update(static_cast<ID *>(ob->data), ID_RECALC_COPY_ON_WRITE | ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_GEOM | ND_SELECT, ob->data);
 
   return OPERATOR_FINISHED;
@@ -3088,7 +3123,7 @@ static int vertex_group_deselect_exec(bContext *C, wmOperator *UNUSED(op))
   Object *ob = ED_object_context(C);
 
   vgroup_select_verts(ob, 0);
-  DEG_id_tag_update(ob->data, ID_RECALC_COPY_ON_WRITE | ID_RECALC_SELECT);
+  DEG_id_tag_update(static_cast<ID *>(ob->data), ID_RECALC_COPY_ON_WRITE | ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_GEOM | ND_SELECT, ob->data);
 
   return OPERATOR_FINISHED;
@@ -3155,7 +3190,8 @@ static int vertex_group_levels_exec(bContext *C, wmOperator *op)
 
   float offset = RNA_float_get(op->ptr, "offset");
   float gain = RNA_float_get(op->ptr, "gain");
-  eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
 
   int subset_count, vgroup_tot;
 
@@ -3242,7 +3278,8 @@ static int vertex_group_normalize_all_exec(bContext *C, wmOperator *op)
 {
   Object *ob = ED_object_context(C);
   bool lock_active = RNA_boolean_get(op->ptr, "lock_active");
-  eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
   bool changed;
   int subset_count, vgroup_tot;
   const bool *vgroup_validmap = BKE_object_defgroup_subset_from_select_type(
@@ -3302,7 +3339,7 @@ static int vertex_group_fix_exec(bContext *C, wmOperator *op)
   float distToBe = RNA_float_get(op->ptr, "dist");
   float strength = RNA_float_get(op->ptr, "strength");
   float cp = RNA_float_get(op->ptr, "accuracy");
-  ModifierData *md = ob->modifiers.first;
+  ModifierData *md = static_cast<ModifierData *>(ob->modifiers.first);
 
   while (md) {
     if (md->type == eModifierType_Mirror && (md->mode & eModifierMode_Realtime)) {
@@ -3391,9 +3428,9 @@ static int vertex_group_lock_exec(bContext *C, wmOperator *op)
   return OPERATOR_FINISHED;
 }
 
-static char *vertex_group_lock_description(struct bContext *UNUSED(C),
-                                           struct wmOperatorType *UNUSED(op),
-                                           struct PointerRNA *params)
+static char *vertex_group_lock_description(bContext *UNUSED(C),
+                                           wmOperatorType *UNUSED(op),
+                                           PointerRNA *params)
 {
   int action = RNA_enum_get(params, "action");
   int mask = RNA_enum_get(params, "mask");
@@ -3414,7 +3451,7 @@ static char *vertex_group_lock_description(struct bContext *UNUSED(C),
       action_str = TIP_("Invert locks of");
       break;
     default:
-      return NULL;
+      return nullptr;
   }
 
   switch (mask) {
@@ -3443,7 +3480,7 @@ static char *vertex_group_lock_description(struct bContext *UNUSED(C),
       }
       break;
     default:
-      return NULL;
+      return nullptr;
   }
 
   return BLI_sprintfN(TIP_("%s %s vertex groups of the active object"), action_str, target_str);
@@ -3491,7 +3528,8 @@ static int vertex_group_invert_exec(bContext *C, wmOperator *op)
   bool auto_assign = RNA_boolean_get(op->ptr, "auto_assign");
   bool auto_remove = RNA_boolean_get(op->ptr, "auto_remove");
 
-  eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
 
   int subset_count, vgroup_tot;
 
@@ -3544,7 +3582,8 @@ static int vertex_group_smooth_exec(bContext *C, wmOperator *op)
 {
   const float fac = RNA_float_get(op->ptr, "factor");
   const int repeat = RNA_int_get(op->ptr, "repeat");
-  const eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  const eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
   const float fac_expand = RNA_float_get(op->ptr, "expand");
 
   uint objects_len;
@@ -3609,7 +3648,8 @@ static int vertex_group_clean_exec(bContext *C, wmOperator *op)
 {
   const float limit = RNA_float_get(op->ptr, "limit");
   const bool keep_single = RNA_boolean_get(op->ptr, "keep_single");
-  const eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  const eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
 
   uint objects_len;
   Object **objects = object_array_for_wpaint(C, &objects_len);
@@ -3676,7 +3716,8 @@ static int vertex_group_quantize_exec(bContext *C, wmOperator *op)
   Object *ob = ED_object_context(C);
 
   const int steps = RNA_int_get(op->ptr, "steps");
-  eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
 
   int subset_count, vgroup_tot;
 
@@ -3719,7 +3760,8 @@ void OBJECT_OT_vertex_group_quantize(wmOperatorType *ot)
 static int vertex_group_limit_total_exec(bContext *C, wmOperator *op)
 {
   const int limit = RNA_int_get(op->ptr, "limit");
-  const eVGroupSelect subset_type = RNA_enum_get(op->ptr, "group_select_mode");
+  const eVGroupSelect subset_type = static_cast<eVGroupSelect>(
+      RNA_enum_get(op->ptr, "group_select_mode"));
   int remove_multi_count = 0;
 
   uint objects_len;
@@ -3830,7 +3872,7 @@ void OBJECT_OT_vertex_group_mirror(wmOperatorType *ot)
   RNA_def_boolean(
       ot->srna,
       "use_topology",
-      0,
+      false,
       "Topology Mirror",
       "Use topology based mirroring (for when both sides of mesh have matching, unique topology)");
 }
@@ -3914,13 +3956,13 @@ static const EnumPropertyItem *vgroup_itemf(bContext *C,
                                             PropertyRNA *UNUSED(prop),
                                             bool *r_free)
 {
-  if (C == NULL) {
+  if (C == nullptr) {
     return DummyRNA_NULL_items;
   }
 
   Object *ob = ED_object_context(C);
   EnumPropertyItem tmp = {0, "", 0, "", ""};
-  EnumPropertyItem *item = NULL;
+  EnumPropertyItem *item = nullptr;
   bDeformGroup *def;
   int a, totitem = 0;
 
@@ -3929,7 +3971,7 @@ static const EnumPropertyItem *vgroup_itemf(bContext *C,
   }
 
   const ListBase *defbase = BKE_object_defgroup_list(ob);
-  for (a = 0, def = defbase->first; def; def = def->next, a++) {
+  for (a = 0, def = static_cast<bDeformGroup *>(defbase->first); def; def = def->next, a++) {
     tmp.value = a;
     tmp.icon = ICON_GROUP_VERTEX;
     tmp.identifier = def->name;
@@ -3980,11 +4022,13 @@ static char *vgroup_init_remap(Object *ob)
 {
   const ListBase *defbase = BKE_object_defgroup_list(ob);
   int defbase_tot = BLI_listbase_count(defbase);
-  char *name_array = MEM_mallocN(MAX_VGROUP_NAME * sizeof(char) * defbase_tot, "sort vgroups");
+  char *name_array = static_cast<char *>(
+      MEM_mallocN(MAX_VGROUP_NAME * sizeof(char) * defbase_tot, "sort vgroups"));
   char *name;
 
   name = name_array;
-  for (const bDeformGroup *def = defbase->first; def; def = def->next) {
+  for (const bDeformGroup *def = static_cast<const bDeformGroup *>(defbase->first); def;
+       def = def->next) {
     BLI_strncpy(name, def->name, MAX_VGROUP_NAME);
     name += MAX_VGROUP_NAME;
   }
@@ -3994,20 +4038,21 @@ static char *vgroup_init_remap(Object *ob)
 
 static int vgroup_do_remap(Object *ob, const char *name_array, wmOperator *op)
 {
-  MDeformVert *dvert = NULL;
+  MDeformVert *dvert = nullptr;
   const bDeformGroup *def;
   const ListBase *defbase = BKE_object_defgroup_list(ob);
   int defbase_tot = BLI_listbase_count(defbase);
 
   /* Needs a dummy index at the start. */
-  int *sort_map_update = MEM_mallocN(sizeof(int) * (defbase_tot + 1), "sort vgroups");
+  int *sort_map_update = static_cast<int *>(
+      MEM_mallocN(sizeof(int) * (defbase_tot + 1), __func__));
   int *sort_map = sort_map_update + 1;
 
   const char *name;
   int i;
 
   name = name_array;
-  for (def = defbase->first, i = 0; def; def = def->next, i++) {
+  for (def = static_cast<const bDeformGroup *>(defbase->first), i = 0; def; def = def->next, i++) {
     sort_map[i] = BLI_findstringindex(defbase, name, offsetof(bDeformGroup, name));
     name += MAX_VGROUP_NAME;
 
@@ -4024,7 +4069,7 @@ static int vgroup_do_remap(Object *ob, const char *name_array, wmOperator *op)
         BMVert *eve;
 
         BM_ITER_MESH (eve, &iter, em->bm, BM_VERTS_OF_MESH) {
-          dvert = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+          dvert = static_cast<MDeformVert *>(BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
           if (dvert->totweight) {
             BKE_defvert_remap(dvert, sort_map, defbase_tot);
           }
@@ -4042,7 +4087,7 @@ static int vgroup_do_remap(Object *ob, const char *name_array, wmOperator *op)
     /* Grease pencil stores vertex groups separately for each stroke,
      * so remap each stroke's weights separately. */
     if (ob->type == OB_GPENCIL) {
-      bGPdata *gpd = ob->data;
+      bGPdata *gpd = static_cast<bGPdata *>(ob->data);
       LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
         LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
           LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
@@ -4061,7 +4106,7 @@ static int vgroup_do_remap(Object *ob, const char *name_array, wmOperator *op)
       }
     }
     else {
-      BKE_object_defgroup_array_get(ob->data, &dvert, &dvert_tot);
+      BKE_object_defgroup_array_get(static_cast<ID *>(ob->data), &dvert, &dvert_tot);
 
       /* Create as necessary. */
       if (dvert) {
@@ -4094,8 +4139,8 @@ static int vgroup_do_remap(Object *ob, const char *name_array, wmOperator *op)
 
 static int vgroup_sort_name(const void *def_a_ptr, const void *def_b_ptr)
 {
-  const bDeformGroup *def_a = def_a_ptr;
-  const bDeformGroup *def_b = def_b_ptr;
+  const bDeformGroup *def_a = static_cast<const bDeformGroup *>(def_a_ptr);
+  const bDeformGroup *def_b = static_cast<const bDeformGroup *>(def_b_ptr);
 
   return BLI_strcasecmp_natural(def_a->name, def_b->name);
 }
@@ -4106,22 +4151,22 @@ static int vgroup_sort_name(const void *def_a_ptr, const void *def_b_ptr)
  */
 static void vgroup_sort_bone_hierarchy(Object *ob, ListBase *bonebase)
 {
-  if (bonebase == NULL) {
+  if (bonebase == nullptr) {
     Object *armobj = BKE_modifiers_is_deformed_by_armature(ob);
-    if (armobj != NULL) {
-      bArmature *armature = armobj->data;
+    if (armobj != nullptr) {
+      bArmature *armature = static_cast<bArmature *>(armobj->data);
       bonebase = &armature->bonebase;
     }
   }
   ListBase *defbase = BKE_object_defgroup_list_mutable(ob);
 
-  if (bonebase != NULL) {
+  if (bonebase != nullptr) {
     Bone *bone;
-    for (bone = bonebase->last; bone; bone = bone->prev) {
+    for (bone = static_cast<Bone *>(bonebase->last); bone; bone = bone->prev) {
       bDeformGroup *dg = BKE_object_defgroup_find_name(ob, bone->name);
       vgroup_sort_bone_hierarchy(ob, &bone->childbase);
 
-      if (dg != NULL) {
+      if (dg != nullptr) {
         BLI_remlink(defbase, dg);
         BLI_addhead(defbase, dg);
       }
@@ -4152,7 +4197,7 @@ static int vertex_group_sort_exec(bContext *C, wmOperator *op)
       BLI_listbase_sort(defbase, vgroup_sort_name);
       break;
     case SORT_TYPE_BONEHIERARCHY:
-      vgroup_sort_bone_hierarchy(ob, NULL);
+      vgroup_sort_bone_hierarchy(ob, nullptr);
       break;
   }
 
@@ -4176,7 +4221,7 @@ void OBJECT_OT_vertex_group_sort(wmOperatorType *ot)
   static const EnumPropertyItem vgroup_sort_type[] = {
       {SORT_TYPE_NAME, "NAME", 0, "Name", ""},
       {SORT_TYPE_BONEHIERARCHY, "BONE_HIERARCHY", 0, "Bone Hierarchy", ""},
-      {0, NULL, 0, NULL, NULL},
+      {0, nullptr, 0, nullptr, nullptr},
   };
 
   ot->name = "Sort Vertex Groups";
@@ -4209,7 +4254,8 @@ static int vgroup_move_exec(bContext *C, wmOperator *op)
 
   ListBase *defbase = BKE_object_defgroup_list_mutable(ob);
 
-  def = BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1);
+  def = static_cast<bDeformGroup *>(
+      BLI_findlink(defbase, BKE_object_defgroup_active_index_get(ob) - 1));
   if (!def) {
     return OPERATOR_CANCELLED;
   }
@@ -4237,7 +4283,7 @@ void OBJECT_OT_vertex_group_move(wmOperatorType *ot)
   static const EnumPropertyItem vgroup_slot_move[] = {
       {-1, "UP", 0, "Up", ""},
       {1, "DOWN", 0, "Down", ""},
-      {0, NULL, 0, NULL, NULL},
+      {0, nullptr, 0, nullptr, nullptr},
   };
 
   /* identifiers */
@@ -4270,7 +4316,7 @@ static void vgroup_copy_active_to_sel_single(Object *ob, const int def_nr)
 {
   MDeformVert *dvert_act;
 
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   BMEditMesh *em = me->edit_mesh;
   int i;
 
@@ -4280,13 +4326,14 @@ static void vgroup_copy_active_to_sel_single(Object *ob, const int def_nr)
     BMVert *eve, *eve_act;
 
     dvert_act = ED_mesh_active_dvert_get_em(ob, &eve_act);
-    if (dvert_act == NULL) {
+    if (dvert_act == nullptr) {
       return;
     }
 
     BM_ITER_MESH_INDEX (eve, &iter, em->bm, BM_VERTS_OF_MESH, i) {
       if (BM_elem_flag_test(eve, BM_ELEM_SELECT) && (eve != eve_act)) {
-        MDeformVert *dvert_dst = BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset);
+        MDeformVert *dvert_dst = static_cast<MDeformVert *>(
+            BM_ELEM_CD_GET_VOID_P(eve, cd_dvert_offset));
 
         BKE_defvert_copy_index(dvert_dst, def_nr, dvert_act, def_nr);
 
@@ -4305,13 +4352,16 @@ static void vgroup_copy_active_to_sel_single(Object *ob, const int def_nr)
     int v_act;
 
     dvert_act = ED_mesh_active_dvert_get_ob(ob, &v_act);
-    if (dvert_act == NULL) {
+    if (dvert_act == nullptr) {
       return;
     }
 
-    dv = me->dvert;
+    const Span<MVert> verts = me->verts();
+    MutableSpan<MDeformVert> dverts = me->deform_verts_for_write();
+
+    dv = dverts.data();
     for (i = 0; i < me->totvert; i++, dv++) {
-      if ((me->mvert[i].flag & SELECT) && (dv != dvert_act)) {
+      if ((verts[i].flag & SELECT) && (dv != dvert_act)) {
 
         BKE_defvert_copy_index(dv, def_nr, dvert_act, def_nr);
 
@@ -4330,7 +4380,7 @@ static void vgroup_copy_active_to_sel_single(Object *ob, const int def_nr)
 static bool check_vertex_group_accessible(wmOperator *op, Object *ob, int def_nr)
 {
   const ListBase *defbase = BKE_object_defgroup_list(ob);
-  bDeformGroup *dg = BLI_findlink(defbase, def_nr);
+  bDeformGroup *dg = static_cast<bDeformGroup *>(BLI_findlink(defbase, def_nr));
 
   if (!dg) {
     BKE_report(op->reports, RPT_ERROR, "Invalid vertex group index");
@@ -4387,7 +4437,7 @@ void OBJECT_OT_vertex_weight_paste(wmOperatorType *ot)
                      "Index of source weight in active vertex group",
                      -1,
                      INT_MAX);
-  RNA_def_property_flag(prop, PROP_SKIP_SAVE | PROP_HIDDEN);
+  RNA_def_property_flag(prop, (PropertyFlag)(PROP_SKIP_SAVE | PROP_HIDDEN));
 }
 
 /** \} */
@@ -4437,7 +4487,7 @@ void OBJECT_OT_vertex_weight_delete(wmOperatorType *ot)
                      "Index of source weight in active vertex group",
                      -1,
                      INT_MAX);
-  RNA_def_property_flag(prop, PROP_SKIP_SAVE | PROP_HIDDEN);
+  RNA_def_property_flag(prop, (PropertyFlag)(PROP_SKIP_SAVE | PROP_HIDDEN));
 }
 
 /** \} */
@@ -4484,7 +4534,7 @@ void OBJECT_OT_vertex_weight_set_active(wmOperatorType *ot)
                      "Index of source weight in active vertex group",
                      -1,
                      INT_MAX);
-  RNA_def_property_flag(prop, PROP_SKIP_SAVE | PROP_HIDDEN);
+  RNA_def_property_flag(prop, (PropertyFlag)(PROP_SKIP_SAVE | PROP_HIDDEN));
 }
 
 /** \} */
@@ -4497,7 +4547,7 @@ static int vertex_weight_normalize_active_vertex_exec(bContext *C, wmOperator *U
 {
   Object *ob = ED_object_context(C);
   ToolSettings *ts = CTX_data_tool_settings(C);
-  eVGroupSelect subset_type = ts->vgroupsubset;
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(ts->vgroupsubset);
   bool changed;
 
   changed = vgroup_normalize_active_vertex(ob, subset_type);
@@ -4536,7 +4586,7 @@ static int vertex_weight_copy_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Object *ob = ED_object_context(C);
   ToolSettings *ts = CTX_data_tool_settings(C);
-  eVGroupSelect subset_type = ts->vgroupsubset;
+  eVGroupSelect subset_type = static_cast<eVGroupSelect>(ts->vgroupsubset);
 
   vgroup_copy_active_to_sel(ob, subset_type);
 
diff --git a/source/blender/editors/physics/CMakeLists.txt b/source/blender/editors/physics/CMakeLists.txt
index ee59efbc925..e56d58c2135 100644
--- a/source/blender/editors/physics/CMakeLists.txt
+++ b/source/blender/editors/physics/CMakeLists.txt
@@ -11,7 +11,6 @@ set(INC
   ../../makesrna
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   ../../../../intern/mantaflow/extern
   # RNA_prototypes.h
diff --git a/source/blender/editors/physics/dynamicpaint_ops.c b/source/blender/editors/physics/dynamicpaint_ops.c
index e8ceb97ed7a..1ce90849a88 100644
--- a/source/blender/editors/physics/dynamicpaint_ops.c
+++ b/source/blender/editors/physics/dynamicpaint_ops.c
@@ -21,6 +21,7 @@
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 
+#include "BKE_attribute.h"
 #include "BKE_context.h"
 #include "BKE_deform.h"
 #include "BKE_dynamicpaint.h"
@@ -233,7 +234,7 @@ static int output_toggle_exec(bContext *C, wmOperator *op)
         ED_mesh_color_add(ob->data, name, true, true, op->reports);
       }
       else {
-        ED_mesh_color_remove_named(ob->data, name);
+        BKE_id_attribute_remove(ob->data, name, NULL);
       }
     }
     /* Vertex Weight Layer */
diff --git a/source/blender/editors/physics/particle_edit.c b/source/blender/editors/physics/particle_edit.c
index 03f9b4eb867..99e42710b49 100644
--- a/source/blender/editors/physics/particle_edit.c
+++ b/source/blender/editors/physics/particle_edit.c
@@ -30,6 +30,7 @@
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
 #include "BKE_global.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_mesh.h"
 #include "BKE_mesh_legacy_convert.h"
@@ -168,7 +169,8 @@ void PE_free_ptcache_edit(PTCacheEdit *edit)
 int PE_minmax(
     Depsgraph *depsgraph, Scene *scene, ViewLayer *view_layer, float min[3], float max[3])
 {
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   PTCacheEdit *edit = PE_get_current(depsgraph, scene, ob);
   ParticleSystem *psys;
   ParticleSystemModifierData *psmd_eval = NULL;
@@ -1450,26 +1452,27 @@ void recalc_emitter_field(Depsgraph *UNUSED(depsgraph), Object *UNUSED(ob), Part
   vec = edit->emitter_cosnos;
   nor = vec + 3;
 
+  const MVert *verts = BKE_mesh_verts(mesh);
   const float(*vert_normals)[3] = BKE_mesh_vertex_normals_ensure(mesh);
-
+  MFace *mfaces = (MFace *)CustomData_get_layer(&mesh->fdata, CD_MFACE);
   for (i = 0; i < totface; i++, vec += 6, nor += 6) {
-    MFace *mface = &mesh->mface[i];
-    MVert *mvert;
+    MFace *mface = &mfaces[i];
+    const MVert *mvert;
 
-    mvert = &mesh->mvert[mface->v1];
+    mvert = &verts[mface->v1];
     copy_v3_v3(vec, mvert->co);
     copy_v3_v3(nor, vert_normals[mface->v1]);
 
-    mvert = &mesh->mvert[mface->v2];
+    mvert = &verts[mface->v2];
     add_v3_v3v3(vec, vec, mvert->co);
     add_v3_v3(nor, vert_normals[mface->v2]);
 
-    mvert = &mesh->mvert[mface->v3];
+    mvert = &verts[mface->v3];
     add_v3_v3v3(vec, vec, mvert->co);
     add_v3_v3(nor, vert_normals[mface->v3]);
 
     if (mface->v4) {
-      mvert = &mesh->mvert[mface->v4];
+      mvert = &verts[mface->v4];
       add_v3_v3v3(vec, vec, mvert->co);
       add_v3_v3(nor, vert_normals[mface->v4]);
 
@@ -3391,7 +3394,7 @@ static void brush_drawcursor(bContext *C, int x, int y, void *UNUSED(customdata)
 
   if (brush) {
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformColor4ub(255, 255, 255, 128);
 
@@ -3567,7 +3570,9 @@ static void PE_mirror_x(Depsgraph *depsgraph, Scene *scene, Object *ob, int tagg
   }
 
   if (newtotpart != psys->totpart) {
-    MFace *mtessface = use_dm_final_indices ? psmd_eval->mesh_final->mface : me->mface;
+    MFace *mtessface = use_dm_final_indices ?
+                           (MFace *)CustomData_get_layer(&psmd_eval->mesh_final->fdata, CD_MFACE) :
+                           (MFace *)CustomData_get_layer(&me->fdata, CD_MFACE);
 
     /* allocate new arrays and copy existing */
     new_pars = MEM_callocN(newtotpart * sizeof(ParticleData), "ParticleData new");
@@ -3983,7 +3988,7 @@ static void brush_puff(PEData *data, int point_index, float mouse_distance)
           /* Translate (not rotate) the rest of the hair if its not selected. */
           {
 /* NOLINTNEXTLINE: readability-redundant-preprocessor */
-#  if 0 /* kindof works but looks worse than what's below */
+#  if 0 /* Kind of works but looks worse than what's below. */
 
             /* Move the unselected point on a vector based on the
              * hair direction and the offset */
@@ -4175,8 +4180,8 @@ static int particle_intersect_mesh(Depsgraph *depsgraph,
   }
 
   totface = mesh->totface;
-  mface = mesh->mface;
-  mvert = mesh->mvert;
+  mface = (MFace *)CustomData_get_layer(&mesh->fdata, CD_MFACE);
+  mvert = BKE_mesh_verts_for_write(mesh);
 
   /* lets intersect the faces */
   for (i = 0; i < totface; i++, mface++) {
diff --git a/source/blender/editors/physics/particle_edit_undo.c b/source/blender/editors/physics/particle_edit_undo.c
index 54d28b49e0c..bc9a90b5b3f 100644
--- a/source/blender/editors/physics/particle_edit_undo.c
+++ b/source/blender/editors/physics/particle_edit_undo.c
@@ -21,6 +21,7 @@
 #include "BLI_utildefines.h"
 
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_particle.h"
 #include "BKE_pointcache.h"
 #include "BKE_undo_system.h"
@@ -211,7 +212,8 @@ static bool particle_undosys_poll(struct bContext *C)
   Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   PTCacheEdit *edit = PE_get_current(depsgraph, scene, ob);
 
   return (edit != NULL);
@@ -225,7 +227,8 @@ static bool particle_undosys_step_encode(struct bContext *C,
   ParticleUndoStep *us = (ParticleUndoStep *)us_p;
   ViewLayer *view_layer = CTX_data_view_layer(C);
   us->scene_ref.ptr = CTX_data_scene(C);
-  us->object_ref.ptr = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(us->scene_ref.ptr, view_layer);
+  us->object_ref.ptr = BKE_view_layer_active_object_get(view_layer);
   PTCacheEdit *edit = PE_get_current(depsgraph, us->scene_ref.ptr, us->object_ref.ptr);
   undoptcache_from_editcache(&us->data, edit);
   return true;
diff --git a/source/blender/editors/physics/particle_object.c b/source/blender/editors/physics/particle_object.c
index 96aea0ededf..08db03db0e9 100644
--- a/source/blender/editors/physics/particle_object.c
+++ b/source/blender/editors/physics/particle_object.c
@@ -23,6 +23,7 @@
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
 #include "BKE_global.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_mesh.h"
@@ -118,7 +119,8 @@ static int particle_system_remove_exec(bContext *C, wmOperator *UNUSED(op))
    */
   if (mode_orig & OB_MODE_PARTICLE_EDIT) {
     if ((ob->mode & OB_MODE_PARTICLE_EDIT) == 0) {
-      if (view_layer->basact && view_layer->basact->object == ob) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      if (BKE_view_layer_active_object_get(view_layer) == ob) {
         WM_event_add_notifier(C, NC_SCENE | ND_MODE | NS_MODE_OBJECT, NULL);
       }
     }
@@ -704,7 +706,7 @@ static bool remap_hair_emitter(Depsgraph *depsgraph,
   PTCacheEditKey *ekey;
   BVHTreeFromMesh bvhtree = {NULL};
   MFace *mface = NULL, *mf;
-  MEdge *medge = NULL, *me;
+  const MEdge *medge = NULL, *me;
   MVert *mvert;
   Mesh *mesh, *target_mesh;
   int numverts;
@@ -750,7 +752,7 @@ static bool remap_hair_emitter(Depsgraph *depsgraph,
   BKE_mesh_tessface_ensure(mesh);
 
   numverts = mesh->totvert;
-  mvert = mesh->mvert;
+  mvert = BKE_mesh_verts_for_write(mesh);
 
   /* convert to global coordinates */
   for (int i = 0; i < numverts; i++) {
@@ -758,11 +760,11 @@ static bool remap_hair_emitter(Depsgraph *depsgraph,
   }
 
   if (mesh->totface != 0) {
-    mface = mesh->mface;
+    mface = CustomData_get_layer(&mesh->fdata, CD_MFACE);
     BKE_bvhtree_from_mesh_get(&bvhtree, mesh, BVHTREE_FROM_FACES, 2);
   }
   else if (mesh->totedge != 0) {
-    medge = mesh->medge;
+    medge = BKE_mesh_edges(mesh);
     BKE_bvhtree_from_mesh_get(&bvhtree, mesh, BVHTREE_FROM_EDGES, 2);
   }
   else {
diff --git a/source/blender/editors/physics/physics_fluid.c b/source/blender/editors/physics/physics_fluid.c
index 80de8fae072..1d3cf7c36af 100644
--- a/source/blender/editors/physics/physics_fluid.c
+++ b/source/blender/editors/physics/physics_fluid.c
@@ -502,6 +502,7 @@ static void fluid_free_startjob(void *customdata, short *stop, short *do_update,
   BKE_fluid_cache_free(fds, job->ob, cache_map);
 #else
   UNUSED_VARS(fds);
+  UNUSED_VARS(cache_map);
 #endif
 
   *do_update = true;
diff --git a/source/blender/editors/physics/rigidbody_constraint.c b/source/blender/editors/physics/rigidbody_constraint.c
index 66ae2d323fd..10d97b02066 100644
--- a/source/blender/editors/physics/rigidbody_constraint.c
+++ b/source/blender/editors/physics/rigidbody_constraint.c
@@ -16,6 +16,7 @@
 
 #include "BKE_collection.h"
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_report.h"
@@ -88,7 +89,7 @@ bool ED_rigidbody_constraint_add(
   /* create constraint group if it doesn't already exits */
   if (rbw->constraints == NULL) {
     rbw->constraints = BKE_collection_add(bmain, NULL, "RigidBodyConstraints");
-    id_fake_user_set(&rbw->constraints->id);
+    id_us_plus(&rbw->constraints->id);
   }
   /* make rigidbody constraint settings */
   ob->rigidbody_constraint = BKE_rigidbody_create_constraint(scene, ob, type);
@@ -122,7 +123,8 @@ static int rigidbody_con_add_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   RigidBodyWorld *rbw = BKE_rigidbody_get_world(scene);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   int type = RNA_enum_get(op->ptr, "type");
   bool changed;
 
@@ -174,7 +176,8 @@ static int rigidbody_con_remove_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   /* apply to active object */
   if (ELEM(NULL, ob, ob->rigidbody_constraint)) {
diff --git a/source/blender/editors/render/CMakeLists.txt b/source/blender/editors/render/CMakeLists.txt
index 4b644ae826f..a91a63201c4 100644
--- a/source/blender/editors/render/CMakeLists.txt
+++ b/source/blender/editors/render/CMakeLists.txt
@@ -17,7 +17,6 @@ set(INC
   ../../render
   ../../sequencer
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/render/render_internal.cc b/source/blender/editors/render/render_internal.cc
index 157c9bc7222..7f6a14126e0 100644
--- a/source/blender/editors/render/render_internal.cc
+++ b/source/blender/editors/render/render_internal.cc
@@ -32,6 +32,7 @@
 #include "BKE_global.h"
 #include "BKE_image.h"
 #include "BKE_image_format.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
@@ -856,7 +857,7 @@ static void screen_render_cancel(bContext *C, wmOperator *op)
 
 static void clean_viewport_memory_base(Base *base)
 {
-  if ((base->flag & BASE_VISIBLE_DEPSGRAPH) == 0) {
+  if ((base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) == 0) {
     return;
   }
 
@@ -885,9 +886,10 @@ static void clean_viewport_memory(Main *bmain, Scene *scene)
        wm = static_cast<wmWindowManager *>(wm->id.next)) {
     LISTBASE_FOREACH (wmWindow *, win, &wm->windows) {
       ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+      BKE_view_layer_synced_ensure(scene, view_layer);
 
-      for (base = static_cast<Base *>(view_layer->object_bases.first); base; base = base->next) {
-        clean_viewport_memory_base(base);
+      LISTBASE_FOREACH (Base *, b, BKE_view_layer_object_bases_get(view_layer)) {
+        clean_viewport_memory_base(b);
       }
     }
   }
diff --git a/source/blender/editors/render/render_opengl.cc b/source/blender/editors/render/render_opengl.cc
index 7bd9812a178..e91bffce2c2 100644
--- a/source/blender/editors/render/render_opengl.cc
+++ b/source/blender/editors/render/render_opengl.cc
@@ -278,19 +278,10 @@ static void screen_opengl_views_setup(OGLRender *oglrender)
 
 static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, RenderResult *rr)
 {
-  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   Scene *scene = oglrender->scene;
-  ARegion *region = oglrender->region;
-  View3D *v3d = oglrender->v3d;
-  RegionView3D *rv3d = oglrender->rv3d;
   Object *camera = nullptr;
   int sizex = oglrender->sizex;
   int sizey = oglrender->sizey;
-  const short view_context = (v3d != nullptr);
-  bool draw_sky = (scene->r.alphamode == R_ADDSKY);
-  float *rectf = nullptr;
-  uchar *rect = nullptr;
-  const char *viewname = RE_GetActiveRenderView(oglrender->re);
   ImBuf *ibuf_result = nullptr;
 
   if (oglrender->is_sequencer) {
@@ -301,7 +292,7 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
     ImBuf *ibuf = oglrender->seq_data.ibufs_arr[oglrender->view_id];
 
     if (ibuf) {
-      ImBuf *out = IMB_dupImBuf(ibuf);
+      ibuf_result = IMB_dupImBuf(ibuf);
       IMB_freeImBuf(ibuf);
       /* OpenGL render is considered to be preview and should be
        * as fast as possible. So currently we're making sure sequencer
@@ -310,25 +301,21 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
        * TODO(sergey): In the case of output to float container (EXR)
        * it actually makes sense to keep float buffer instead.
        */
-      if (out->rect_float != nullptr) {
-        IMB_rect_from_float(out);
-        imb_freerectfloatImBuf(out);
+      if (ibuf_result->rect_float != nullptr) {
+        IMB_rect_from_float(ibuf_result);
+        imb_freerectfloatImBuf(ibuf_result);
       }
-      BLI_assert((oglrender->sizex == ibuf->x) && (oglrender->sizey == ibuf->y));
-      RE_render_result_rect_from_ibuf(rr, out, oglrender->view_id);
-      IMB_freeImBuf(out);
+      BLI_assert((sizex == ibuf->x) && (sizey == ibuf->y));
     }
     else if (gpd) {
       /* If there are no strips, Grease Pencil still needs a buffer to draw on */
-      ImBuf *out = IMB_allocImBuf(oglrender->sizex, oglrender->sizey, 32, IB_rect);
-      RE_render_result_rect_from_ibuf(rr, out, oglrender->view_id);
-      IMB_freeImBuf(out);
+      ibuf_result = IMB_allocImBuf(sizex, sizey, 32, IB_rect);
     }
 
     if (gpd) {
       int i;
       uchar *gp_rect;
-      uchar *render_rect = (uchar *)RE_RenderViewGetById(rr, oglrender->view_id)->rect32;
+      uchar *render_rect = (uchar *)ibuf_result->rect;
 
       DRW_opengl_context_enable();
       GPU_offscreen_bind(oglrender->ofs, true);
@@ -359,10 +346,16 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
   }
   else {
     /* shouldn't suddenly give errors mid-render but possible */
+    Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
     char err_out[256] = "unknown";
     ImBuf *ibuf_view;
+    bool draw_sky = (scene->r.alphamode == R_ADDSKY);
     const int alpha_mode = (draw_sky) ? R_ADDSKY : R_ALPHAPREMUL;
-    if (view_context) {
+    const char *viewname = RE_GetActiveRenderView(oglrender->re);
+    View3D *v3d = oglrender->v3d;
+
+    if (v3d != nullptr) {
+      ARegion *region = oglrender->region;
       ibuf_view = ED_view3d_draw_offscreen_imbuf(depsgraph,
                                                  scene,
                                                  static_cast<eDrawType>(v3d->shading.type),
@@ -378,7 +371,7 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
                                                  err_out);
 
       /* for stamp only */
-      if (rv3d->persp == RV3D_CAMOB && v3d->camera) {
+      if (oglrender->rv3d->persp == RV3D_CAMOB && v3d->camera) {
         camera = BKE_camera_multiview_render(oglrender->scene, v3d->camera, viewname);
       }
     }
@@ -388,8 +381,8 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
                                                         nullptr,
                                                         OB_SOLID,
                                                         scene->camera,
-                                                        oglrender->sizex,
-                                                        oglrender->sizey,
+                                                        sizex,
+                                                        sizey,
                                                         IB_rectfloat,
                                                         V3D_OFSDRAW_SHOW_ANNOTATION,
                                                         alpha_mode,
@@ -401,12 +394,6 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
 
     if (ibuf_view) {
       ibuf_result = ibuf_view;
-      if (ibuf_view->rect_float) {
-        rectf = ibuf_view->rect_float;
-      }
-      else {
-        rect = (uchar *)ibuf_view->rect;
-      }
     }
     else {
       fprintf(stderr, "%s: failed to get buffer, %s\n", __func__, err_out);
@@ -415,6 +402,14 @@ static void screen_opengl_render_doit(const bContext *C, OGLRender *oglrender, R
 
   if (ibuf_result != nullptr) {
     if ((scene->r.stamp & R_STAMP_ALL) && (scene->r.stamp & R_STAMP_DRAW)) {
+      float *rectf = nullptr;
+      uchar *rect = nullptr;
+      if (ibuf_result->rect_float) {
+        rectf = ibuf_result->rect_float;
+      }
+      else {
+        rect = (uchar *)ibuf_result->rect;
+      }
       BKE_image_stamp_buf(scene, camera, nullptr, rect, rectf, rr->rectx, rr->recty, 4);
     }
     RE_render_result_rect_from_ibuf(rr, ibuf_result, oglrender->view_id);
@@ -758,8 +753,7 @@ static bool screen_opengl_render_init(bContext *C, wmOperator *op)
   WM_jobs_kill_all_except(wm, CTX_wm_screen(C));
 
   /* create offscreen buffer */
-  sizex = (scene->r.size * scene->r.xsch) / 100;
-  sizey = (scene->r.size * scene->r.ysch) / 100;
+  BKE_render_resolution(&scene->r, false, &sizex, &sizey);
 
   /* corrects render size with actual size, not every card supports non-power-of-two dimensions */
   DRW_opengl_context_enable(); /* Off-screen creation needs to be done in DRW context. */
diff --git a/source/blender/editors/render/render_preview.cc b/source/blender/editors/render/render_preview.cc
index 97bbcaa102f..10de7063bbc 100644
--- a/source/blender/editors/render/render_preview.cc
+++ b/source/blender/editors/render/render_preview.cc
@@ -307,7 +307,8 @@ static void switch_preview_floor_visibility(Main *pr_main,
                                             const ePreviewRenderMethod pr_method)
 {
   /* Hide floor for icon renders. */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (STREQ(base->object->id.name + 2, "Floor")) {
       base->object->visibility_flag &= ~OB_HIDE_RENDER;
       if (pr_method == PR_ICON_RENDER) {
@@ -533,8 +534,8 @@ static Scene *preview_prepare_scene(
       else {
         sce->display.render_aa = SCE_DISPLAY_AA_OFF;
       }
-
-      LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+      BKE_view_layer_synced_ensure(sce, view_layer);
+      LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
         if (base->object->id.name[2] == 'p') {
           /* copy over object color, in case material uses it */
           copy_v4_v4(base->object->color, sp->color);
@@ -550,7 +551,7 @@ static Scene *preview_prepare_scene(
             }
           }
           else if (base->object->type == OB_LAMP) {
-            base->flag |= BASE_VISIBLE_DEPSGRAPH;
+            base->flag |= BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT;
           }
         }
       }
@@ -586,7 +587,8 @@ static Scene *preview_prepare_scene(
         sce->world->horb = 0.0f;
       }
 
-      LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+      BKE_view_layer_synced_ensure(sce, view_layer);
+      LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
         if (base->object->id.name[2] == 'p') {
           if (base->object->type == OB_LAMP) {
             base->object->data = la;
@@ -679,7 +681,7 @@ static bool ed_preview_draw_rect(ScrArea *area, int split, int first, rcti *rect
         /* material preview only needs monoscopy (view 0) */
         RE_AcquiredResultGet32(re, &rres, (uint *)rect_byte, 0);
 
-        IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+        IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
         immDrawPixelsTexTiled(&state,
                               fx,
                               fy,
@@ -775,10 +777,11 @@ static bool object_preview_is_type_supported(const Object *ob)
 }
 
 static Object *object_preview_camera_create(Main *preview_main,
+                                            Scene *scene,
                                             ViewLayer *view_layer,
                                             Object *preview_object)
 {
-  Object *camera = BKE_object_add(preview_main, view_layer, OB_CAMERA, "Preview Camera");
+  Object *camera = BKE_object_add(preview_main, scene, view_layer, OB_CAMERA, "Preview Camera");
 
   float rotmat[3][3];
   float dummyscale[3];
@@ -817,13 +820,14 @@ static Scene *object_preview_scene_create(const struct ObjectPreviewData *previe
   BKE_collection_object_add(preview_data->pr_main, scene->master_collection, preview_data->object);
 
   Object *camera_object = object_preview_camera_create(
-      preview_data->pr_main, view_layer, preview_data->object);
+      preview_data->pr_main, scene, view_layer, preview_data->object);
 
   scene->camera = camera_object;
   scene->r.xsch = preview_data->sizex;
   scene->r.ysch = preview_data->sizey;
   scene->r.size = 100;
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *preview_base = BKE_view_layer_base_find(view_layer, preview_data->object);
   /* For 'view selected' below. */
   preview_base->flag |= BASE_SELECTED;
@@ -1304,41 +1308,33 @@ static void shader_preview_free(void *customdata)
 
 static ImBuf *icon_preview_imbuf_from_brush(Brush *brush)
 {
-  static const int flags = IB_rect | IB_multilayer | IB_metadata;
+  if (!brush->icon_imbuf && (brush->flag & BRUSH_CUSTOM_ICON) && brush->icon_filepath[0]) {
+    const int flags = IB_rect | IB_multilayer | IB_metadata;
 
-  char filepath[FILE_MAX];
-  const char *folder;
+    /* First use the path directly to try and load the file. */
+    char filepath[FILE_MAX];
 
-  if (!(brush->icon_imbuf)) {
-    if (brush->flag & BRUSH_CUSTOM_ICON) {
+    BLI_strncpy(filepath, brush->icon_filepath, sizeof(brush->icon_filepath));
+    BLI_path_abs(filepath, ID_BLEND_PATH_FROM_GLOBAL(&brush->id));
 
-      if (brush->icon_filepath[0]) {
-        /* First use the path directly to try and load the file. */
+    /* Use default color-spaces for brushes. */
+    brush->icon_imbuf = IMB_loadiffname(filepath, flags, nullptr);
 
-        BLI_strncpy(filepath, brush->icon_filepath, sizeof(brush->icon_filepath));
-        BLI_path_abs(filepath, ID_BLEND_PATH_FROM_GLOBAL(&brush->id));
+    /* Otherwise lets try to find it in other directories. */
+    if (!(brush->icon_imbuf)) {
+      const char *brushicons_dir = BKE_appdir_folder_id(BLENDER_DATAFILES, "brushicons");
+      /* Expected to be found, but don't crash if it's not. */
+      if (brushicons_dir) {
+        BLI_join_dirfile(filepath, sizeof(filepath), brushicons_dir, brush->icon_filepath);
 
-        /* Use default color-spaces for brushes. */
+        /* Use default color spaces. */
         brush->icon_imbuf = IMB_loadiffname(filepath, flags, nullptr);
-
-        /* otherwise lets try to find it in other directories */
-        if (!(brush->icon_imbuf)) {
-          folder = BKE_appdir_folder_id(BLENDER_DATAFILES, "brushicons");
-
-          BLI_make_file_string(
-              BKE_main_blendfile_path_from_global(), filepath, folder, brush->icon_filepath);
-
-          if (filepath[0]) {
-            /* Use default color spaces. */
-            brush->icon_imbuf = IMB_loadiffname(filepath, flags, nullptr);
-          }
-        }
-
-        if (brush->icon_imbuf) {
-          BKE_icon_changed(BKE_icon_id_ensure(&brush->id));
-        }
       }
     }
+
+    if (brush->icon_imbuf) {
+      BKE_icon_changed(BKE_icon_id_ensure(&brush->id));
+    }
   }
 
   if (!(brush->icon_imbuf)) {
@@ -1771,7 +1767,7 @@ PreviewLoadJob &PreviewLoadJob::ensure_job(wmWindowManager *wm, wmWindow *win)
     WM_jobs_start(wm, wm_job);
   }
 
-  return *reinterpret_cast<PreviewLoadJob *>(WM_jobs_customdata_get(wm_job));
+  return *static_cast<PreviewLoadJob *>(WM_jobs_customdata_get(wm_job));
 }
 
 void PreviewLoadJob::load_jobless(PreviewImage *preview, const eIconSizes icon_size)
@@ -1807,11 +1803,11 @@ void PreviewLoadJob::run_fn(void *customdata,
                             short *do_update,
                             float *UNUSED(progress))
 {
-  PreviewLoadJob *job_data = reinterpret_cast<PreviewLoadJob *>(customdata);
+  PreviewLoadJob *job_data = static_cast<PreviewLoadJob *>(customdata);
 
   IMB_thumb_locks_acquire();
 
-  while (RequestedPreview *request = reinterpret_cast<RequestedPreview *>(
+  while (RequestedPreview *request = static_cast<RequestedPreview *>(
              BLI_thread_queue_pop_timeout(job_data->todo_queue_, 100))) {
     if (*stop) {
       break;
@@ -1864,7 +1860,7 @@ void PreviewLoadJob::finish_request(RequestedPreview &request)
 
 void PreviewLoadJob::update_fn(void *customdata)
 {
-  PreviewLoadJob *job_data = reinterpret_cast<PreviewLoadJob *>(customdata);
+  PreviewLoadJob *job_data = static_cast<PreviewLoadJob *>(customdata);
 
   for (auto request_it = job_data->requested_previews_.begin();
        request_it != job_data->requested_previews_.end();) {
@@ -1884,7 +1880,7 @@ void PreviewLoadJob::update_fn(void *customdata)
 
 void PreviewLoadJob::end_fn(void *customdata)
 {
-  PreviewLoadJob *job_data = reinterpret_cast<PreviewLoadJob *>(customdata);
+  PreviewLoadJob *job_data = static_cast<PreviewLoadJob *>(customdata);
 
   /* Finish any possibly remaining queued previews. */
   for (RequestedPreview &request : job_data->requested_previews_) {
@@ -1895,7 +1891,7 @@ void PreviewLoadJob::end_fn(void *customdata)
 
 void PreviewLoadJob::free_fn(void *customdata)
 {
-  MEM_delete(reinterpret_cast<PreviewLoadJob *>(customdata));
+  MEM_delete(static_cast<PreviewLoadJob *>(customdata));
 }
 
 static void icon_preview_free(void *customdata)
diff --git a/source/blender/editors/render/render_shading.cc b/source/blender/editors/render/render_shading.cc
index da2290f7372..f784346ec8f 100644
--- a/source/blender/editors/render/render_shading.cc
+++ b/source/blender/editors/render/render_shading.cc
@@ -934,7 +934,7 @@ static int view_layer_add_exec(bContext *C, wmOperator *op)
     WM_window_set_active_view_layer(win, view_layer_new);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1039,7 +1039,7 @@ static int view_layer_add_aov_exec(bContext *C, wmOperator *UNUSED(op))
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1091,7 +1091,7 @@ static int view_layer_remove_aov_exec(bContext *C, wmOperator *UNUSED(op))
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1143,7 +1143,7 @@ static int view_layer_add_lightgroup_exec(bContext *C, wmOperator *op)
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1193,7 +1193,7 @@ static int view_layer_remove_lightgroup_exec(bContext *C, wmOperator *UNUSED(op)
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1257,7 +1257,7 @@ static int view_layer_add_used_lightgroups_exec(bContext *C, wmOperator *UNUSED(
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1301,7 +1301,7 @@ static int view_layer_remove_unused_lightgroups_exec(bContext *C, wmOperator *UN
     ntreeCompositUpdateRLayers(scene->nodetree);
   }
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(CTX_data_main(C));
   WM_event_add_notifier(C, NC_SCENE | ND_LAYER, scene);
 
@@ -1692,7 +1692,7 @@ static int freestyle_module_remove_exec(bContext *C, wmOperator *UNUSED(op))
 
   BKE_freestyle_module_delete(&view_layer->freestyle_config, module);
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
 
   return OPERATOR_FINISHED;
@@ -1722,7 +1722,7 @@ static int freestyle_module_move_exec(bContext *C, wmOperator *op)
   int dir = RNA_enum_get(op->ptr, "direction");
 
   if (BKE_freestyle_module_move(&view_layer->freestyle_config, module, dir)) {
-    DEG_id_tag_update(&scene->id, 0);
+    DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
     WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
   }
 
@@ -1778,7 +1778,7 @@ static int freestyle_lineset_add_exec(bContext *C, wmOperator *UNUSED(op))
 
   BKE_freestyle_lineset_add(bmain, &view_layer->freestyle_config, nullptr);
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
 
   return OPERATOR_FINISHED;
@@ -1852,7 +1852,7 @@ static int freestyle_lineset_paste_exec(bContext *C, wmOperator *UNUSED(op))
 
   FRS_paste_active_lineset(&view_layer->freestyle_config);
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
 
   return OPERATOR_FINISHED;
@@ -1886,7 +1886,7 @@ static int freestyle_lineset_remove_exec(bContext *C, wmOperator *UNUSED(op))
 
   FRS_delete_active_lineset(&view_layer->freestyle_config);
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
 
   return OPERATOR_FINISHED;
@@ -1920,7 +1920,7 @@ static int freestyle_lineset_move_exec(bContext *C, wmOperator *op)
   int dir = RNA_enum_get(op->ptr, "direction");
 
   if (FRS_move_active_lineset(&view_layer->freestyle_config, dir)) {
-    DEG_id_tag_update(&scene->id, 0);
+    DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
     WM_event_add_notifier(C, NC_SCENE | ND_RENDER_OPTIONS, scene);
   }
 
diff --git a/source/blender/editors/render/render_update.cc b/source/blender/editors/render/render_update.cc
index 3d26e764211..7cefcf9815e 100644
--- a/source/blender/editors/render/render_update.cc
+++ b/source/blender/editors/render/render_update.cc
@@ -95,20 +95,20 @@ void ED_render_view3d_update(Depsgraph *depsgraph,
 
       CTX_free(C);
     }
-    else {
-      RenderEngineType *engine_type = ED_view3d_engine_type(scene, v3d->shading.type);
-      if (updated) {
-        DRWUpdateContext drw_context = {nullptr};
-        drw_context.bmain = bmain;
-        drw_context.depsgraph = depsgraph;
-        drw_context.scene = scene;
-        drw_context.view_layer = view_layer;
-        drw_context.region = region;
-        drw_context.v3d = v3d;
-        drw_context.engine_type = engine_type;
-        DRW_notify_view_update(&drw_context);
-      }
+
+    if (!updated) {
+      continue;
     }
+
+    DRWUpdateContext drw_context = {nullptr};
+    drw_context.bmain = bmain;
+    drw_context.depsgraph = depsgraph;
+    drw_context.scene = scene;
+    drw_context.view_layer = view_layer;
+    drw_context.region = region;
+    drw_context.v3d = v3d;
+    drw_context.engine_type = ED_view3d_engine_type(scene, v3d->shading.type);
+    DRW_notify_view_update(&drw_context);
   }
 }
 
diff --git a/source/blender/editors/render/render_view.cc b/source/blender/editors/render/render_view.cc
index a7ff2aad05a..7569b3600a1 100644
--- a/source/blender/editors/render/render_view.cc
+++ b/source/blender/editors/render/render_view.cc
@@ -19,6 +19,7 @@
 #include "BKE_image.h"
 #include "BKE_main.h"
 #include "BKE_report.h"
+#include "BKE_scene.h"
 #include "BKE_screen.h"
 
 #include "BLT_translation.h"
@@ -73,7 +74,7 @@ static ScrArea *find_area_showing_r_result(bContext *C, Scene *scene, wmWindow *
   ScrArea *area = nullptr;
   SpaceImage *sima;
 
-  /* find an imagewindow showing render result */
+  /* find an image-window showing render result */
   for (*win = static_cast<wmWindow *>(wm->windows.first); *win; *win = (*win)->next) {
     if (WM_window_get_active_scene(*win) == scene) {
       const bScreen *screen = WM_window_get_active_screen(*win);
@@ -101,7 +102,7 @@ static ScrArea *find_area_image_empty(bContext *C)
   ScrArea *area;
   SpaceImage *sima;
 
-  /* find an imagewindow showing render result */
+  /* find an image-window showing render result */
   for (area = static_cast<ScrArea *>(screen->areabase.first); area; area = area->next) {
     if (area->spacetype == SPACE_IMAGE) {
       sima = static_cast<SpaceImage *>(area->spacedata.first);
@@ -130,8 +131,11 @@ ScrArea *render_view_open(bContext *C, int mx, int my, ReportList *reports)
   }
 
   if (U.render_display_type == USER_RENDER_DISPLAY_WINDOW) {
-    int sizex = 30 * UI_DPI_FAC + (scene->r.xsch * scene->r.size) / 100;
-    int sizey = 60 * UI_DPI_FAC + (scene->r.ysch * scene->r.size) / 100;
+    int sizex, sizey;
+    BKE_render_resolution(&scene->r, false, &sizex, &sizey);
+
+    sizex += 30 * UI_DPI_FAC;
+    sizey += 60 * UI_DPI_FAC;
 
     /* arbitrary... miniature image window views don't make much sense */
     if (sizex < 320) {
diff --git a/source/blender/editors/scene/scene_edit.c b/source/blender/editors/scene/scene_edit.c
index 57a9e6be917..07a93d3907a 100644
--- a/source/blender/editors/scene/scene_edit.c
+++ b/source/blender/editors/scene/scene_edit.c
@@ -229,7 +229,7 @@ bool ED_scene_view_layer_delete(Main *bmain, Scene *scene, ViewLayer *layer, Rep
 
   BKE_view_layer_free(layer);
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   DEG_relations_tag_update(bmain);
   WM_main_add_notifier(NC_SCENE | ND_LAYER | NA_REMOVED, scene);
 
diff --git a/source/blender/editors/screen/CMakeLists.txt b/source/blender/editors/screen/CMakeLists.txt
index f9b1e2b5d4c..119758f3335 100644
--- a/source/blender/editors/screen/CMakeLists.txt
+++ b/source/blender/editors/screen/CMakeLists.txt
@@ -15,7 +15,6 @@ set(INC
   ../../makesrna
   ../../sequencer
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index def6c38f5ca..25e16bee558 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -16,6 +16,7 @@
 #include "BLI_linklist_stack.h"
 #include "BLI_math.h"
 #include "BLI_rand.h"
+#include "BLI_string_utils.h"
 #include "BLI_utildefines.h"
 
 #include "BKE_context.h"
@@ -83,7 +84,7 @@ static void region_draw_emboss(const ARegion *region, const rcti *scirct, int si
 
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4fv(color);
 
   immBeginAtMost(GPU_PRIM_LINES, 8);
@@ -127,7 +128,7 @@ void ED_region_pixelspace(const ARegion *region)
 void ED_region_do_listen(wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *notifier = params->notifier;
+  const wmNotifier *notifier = params->notifier;
 
   /* generic notes first */
   switch (notifier->category) {
@@ -174,7 +175,7 @@ void ED_area_do_refresh(bContext *C, ScrArea *area)
 }
 
 /**
- * \brief Corner widget use for quitting fullscreen.
+ * \brief Corner widget use for quitting full-screen.
  */
 static void area_draw_azone_fullscreen(
     short UNUSED(x1), short UNUSED(y1), short x2, short y2, float alpha)
@@ -238,8 +239,6 @@ static void draw_azone_arrow(float x1, float y1, float x2, float y2, AZEdge edge
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
   GPU_blend(GPU_BLEND_ALPHA);
-  /* NOTE(fclem): There is something strange going on with Mesa and GPU_SHADER_2D_UNIFORM_COLOR
-   * that causes a crash on some GPUs (see T76113). Using 3D variant avoid the issue. */
   immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4f(0.8f, 0.8f, 0.8f, 0.4f);
 
@@ -563,7 +562,7 @@ void ED_region_do_draw(bContext *C, ARegion *region)
     GPU_blend(GPU_BLEND_ALPHA);
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4f(BLI_thread_frand(0), BLI_thread_frand(0), BLI_thread_frand(0), 0.1f);
     immRectf(pos,
              region->drawrct.xmin - region->winrct.xmin,
@@ -593,7 +592,7 @@ void ED_region_do_draw(bContext *C, ARegion *region)
       UI_GetThemeColor3fv(TH_EDITOR_OUTLINE, color);
       GPUVertFormat *format = immVertexFormat();
       uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       immUniformColor4fv(color);
       GPU_line_width(1.0f);
       imm_draw_box_wire_2d(pos,
@@ -846,7 +845,7 @@ void ED_workspace_status_text(bContext *C, const char *str)
 
 static void area_azone_init(wmWindow *win, const bScreen *screen, ScrArea *area)
 {
-  /* reinitialize entirely, regions and fullscreen add azones too */
+  /* reinitialize entirely, regions and full-screen add azones too */
   BLI_freelistN(&area->actionzones);
 
   if (screen->state != SCREENNORMAL) {
@@ -1903,6 +1902,7 @@ void ED_area_init(wmWindowManager *wm, wmWindow *win, ScrArea *area)
 {
   WorkSpace *workspace = WM_window_get_active_workspace(win);
   const bScreen *screen = BKE_workspace_active_screen_get(win->workspace_hook);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
 
   if (ED_area_is_global(area) && (area->global->flag & GLOBAL_AREA_IS_HIDDEN)) {
@@ -1967,7 +1967,7 @@ void ED_area_init(wmWindowManager *wm, wmWindow *win, ScrArea *area)
   /* Avoid re-initializing tools while resizing the window. */
   if ((G.moving & G_TRANSFORM_WM) == 0) {
     if ((1 << area->spacetype) & WM_TOOLSYSTEM_SPACE_MASK) {
-      WM_toolsystem_refresh_screen_area(workspace, view_layer, area);
+      WM_toolsystem_refresh_screen_area(workspace, scene, view_layer, area);
       area->flag |= AREA_FLAG_ACTIVE_TOOL_UPDATE;
     }
     else {
@@ -2578,8 +2578,8 @@ void ED_area_prevspace(bContext *C, ScrArea *area)
     /* no change */
     return;
   }
-  /* If this is a stacked fullscreen, changing to previous area exits it (meaning we're still in a
-   * fullscreen, but not in a stacked one). */
+  /* If this is a stacked full-screen, changing to previous area exits it (meaning we're still in a
+   * full-screen, but not in a stacked one). */
   area->flag &= ~AREA_FLAG_STACKED_FULLSCREEN;
 
   ED_area_tag_redraw(area);
@@ -2689,12 +2689,13 @@ static void ed_panel_draw(const bContext *C,
   const uiStyle *style = UI_style_get_dpi();
 
   /* Draw panel. */
-
   char block_name[BKE_ST_MAXNAME + INSTANCED_PANEL_UNIQUE_STR_LEN];
-  strncpy(block_name, pt->idname, BKE_ST_MAXNAME);
-  if (unique_panel_str != NULL) {
+  if (unique_panel_str) {
     /* Instanced panels should have already been added at this point. */
-    strncat(block_name, unique_panel_str, INSTANCED_PANEL_UNIQUE_STR_LEN);
+    BLI_string_join(block_name, sizeof(block_name), pt->idname, unique_panel_str);
+  }
+  else {
+    STRNCPY(block_name, pt->idname);
   }
   uiBlock *block = UI_block_begin(C, region, block_name, UI_EMBOSS);
 
@@ -3558,7 +3559,7 @@ void ED_region_info_draw_multiline(ARegion *region,
   GPU_blend(GPU_BLEND_ALPHA);
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4fv(fill_color);
   immRecti(pos, rect.xmin, rect.ymin, rect.xmax + 1, rect.ymax + 1);
   immUnbindProgram();
@@ -3629,7 +3630,7 @@ void ED_region_grid_draw(ARegion *region, float zoomx, float zoomy, float x0, fl
   float gridcolor[4];
   UI_GetThemeColor4fv(TH_GRID, gridcolor);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   /* To fake alpha-blending, color shading is reduced when alpha is nearing 0. */
   immUniformThemeColorBlendShade(TH_BACK, TH_GRID, gridcolor[3], 20 * gridcolor[3]);
   immRectf(pos, x1, y1, x2, y2);
@@ -3666,7 +3667,7 @@ void ED_region_grid_draw(ARegion *region, float zoomx, float zoomy, float x0, fl
     pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
     uint color = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
     immBegin(GPU_PRIM_LINES, 4 * count_fine + 4 * count_large);
 
     float theme_color[3];
@@ -3779,7 +3780,7 @@ void ED_region_cache_draw_background(ARegion *region)
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4ub(128, 128, 255, 64);
   immRecti(pos, 0, region_bottom, region->winx, region_bottom + 8 * UI_DPI_FAC);
   immUnbindProgram();
@@ -3800,7 +3801,7 @@ void ED_region_cache_draw_curfra_label(const int framenr, const float x, const f
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColor(TH_CFRAME);
   immRecti(pos, x, y, x + font_dims[0] + 6.0f, y + font_dims[1] + 4.0f);
   immUnbindProgram();
@@ -3820,7 +3821,7 @@ void ED_region_cache_draw_cached_segments(
 
     uint pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4ub(128, 128, 255, 128);
 
     for (int a = 0; a < num_segments; a++) {
diff --git a/source/blender/editors/screen/glutil.c b/source/blender/editors/screen/glutil.c
index 8a84f4cf079..4382fd3d1c2 100644
--- a/source/blender/editors/screen/glutil.c
+++ b/source/blender/editors/screen/glutil.c
@@ -77,9 +77,10 @@ void immDrawPixelsTexScaledFullSize(const IMMDrawPixelsTexState *state,
    * filtering results. Mipmaps can be used to get better results (i.e. #GL_LINEAR_MIPMAP_LINEAR),
    * so always use mipmaps when filtering. */
   const bool use_mipmap = use_filter && ((draw_width < img_w) || (draw_height < img_h));
-  const int mips = use_mipmap ? 9999 : 1;
+  const int mip_len = use_mipmap ? 9999 : 1;
 
-  GPUTexture *tex = GPU_texture_create_2d("immDrawPixels", img_w, img_h, mips, gpu_format, NULL);
+  GPUTexture *tex = GPU_texture_create_2d(
+      "immDrawPixels", img_w, img_h, mip_len, gpu_format, NULL);
 
   const bool use_float_data = ELEM(gpu_format, GPU_RGBA16F, GPU_RGB16F, GPU_R16F);
   eGPUDataFormat gpu_data_format = (use_float_data) ? GPU_DATA_FLOAT : GPU_DATA_UBYTE;
@@ -514,7 +515,7 @@ void ED_draw_imbuf_clipping(ImBuf *ibuf,
         ibuf, view_settings, display_settings, &cache_handle);
 
     if (display_buffer) {
-      IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+      IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
       immDrawPixelsTexTiled_clipping(&state,
                                      x,
                                      y,
diff --git a/source/blender/editors/screen/screen_context.c b/source/blender/editors/screen/screen_context.c
index 239113c28a4..ffd76e70eb8 100644
--- a/source/blender/editors/screen/screen_context.c
+++ b/source/blender/editors/screen/screen_context.c
@@ -100,6 +100,7 @@ const char *screen_context_dir[] = {
     "active_gpencil_frame",
     "active_annotation_layer",
     "active_operator",
+    "active_action",
     "selected_visible_actions",
     "selected_editable_actions",
     "visible_fcurves",
@@ -128,9 +129,11 @@ static eContextResult screen_ctx_visible_objects(const bContext *C, bContextData
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+  BKE_view_layer_synced_ensure(scene, view_layer);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_VISIBLE(v3d, base)) {
       CTX_data_id_list_add(result, &base->object->id);
     }
@@ -142,9 +145,11 @@ static eContextResult screen_ctx_selectable_objects(const bContext *C, bContextD
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+  BKE_view_layer_synced_ensure(scene, view_layer);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_SELECTABLE(v3d, base)) {
       CTX_data_id_list_add(result, &base->object->id);
     }
@@ -156,9 +161,11 @@ static eContextResult screen_ctx_selected_objects(const bContext *C, bContextDat
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+  BKE_view_layer_synced_ensure(scene, view_layer);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_SELECTED(v3d, base)) {
       CTX_data_id_list_add(result, &base->object->id);
     }
@@ -171,9 +178,11 @@ static eContextResult screen_ctx_selected_editable_objects(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+  BKE_view_layer_synced_ensure(scene, view_layer);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_SELECTED_EDITABLE(v3d, base)) {
       CTX_data_id_list_add(result, &base->object->id);
     }
@@ -185,10 +194,12 @@ static eContextResult screen_ctx_editable_objects(const bContext *C, bContextDat
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
+  BKE_view_layer_synced_ensure(scene, view_layer);
 
   /* Visible + Editable, but not necessarily selected */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_EDITABLE(v3d, base)) {
       CTX_data_id_list_add(result, &base->object->id);
     }
@@ -200,11 +211,13 @@ static eContextResult screen_ctx_objects_in_mode(const bContext *C, bContextData
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (obact && (obact->mode != OB_MODE_OBJECT)) {
-    FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, obact->type, obact->mode, ob_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, obact->type, obact->mode, ob_iter) {
       CTX_data_id_list_add(result, &ob_iter->id);
     }
     FOREACH_OBJECT_IN_MODE_END;
@@ -217,15 +230,17 @@ static eContextResult screen_ctx_objects_in_mode_unique_data(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (obact && (obact->mode != OB_MODE_OBJECT)) {
-    FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, obact->type, obact->mode, ob_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, obact->type, obact->mode, ob_iter) {
       ob_iter->id.tag |= LIB_TAG_DOIT;
     }
     FOREACH_OBJECT_IN_MODE_END;
-    FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, obact->type, obact->mode, ob_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, obact->type, obact->mode, ob_iter) {
       if (ob_iter->id.tag & LIB_TAG_DOIT) {
         ob_iter->id.tag &= ~LIB_TAG_DOIT;
         CTX_data_id_list_add(result, &ob_iter->id);
@@ -241,8 +256,10 @@ static eContextResult screen_ctx_visible_or_editable_bones_(const bContext *C,
                                                             const bool editable_bones)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
 
   bArmature *arm = (obedit && obedit->type == OB_ARMATURE) ? obedit->data : NULL;
   EditBone *flipbone = NULL;
@@ -250,7 +267,7 @@ static eContextResult screen_ctx_visible_or_editable_bones_(const bContext *C,
   if (arm && arm->edbo) {
     uint objects_len;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &objects_len);
+        scene, view_layer, CTX_wm_view3d(C), &objects_len);
     for (uint i = 0; i < objects_len; i++) {
       Object *ob = objects[i];
       arm = ob->data;
@@ -312,15 +329,17 @@ static eContextResult screen_ctx_selected_bones_(const bContext *C,
                                                  const bool selected_editable_bones)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   bArmature *arm = (obedit && obedit->type == OB_ARMATURE) ? obedit->data : NULL;
   EditBone *flipbone = NULL;
 
   if (arm && arm->edbo) {
     uint objects_len;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &objects_len);
+        scene, view_layer, CTX_wm_view3d(C), &objects_len);
     for (uint i = 0; i < objects_len; i++) {
       Object *ob = objects[i];
       arm = ob->data;
@@ -382,8 +401,10 @@ static eContextResult screen_ctx_visible_pose_bones(const bContext *C, bContextD
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   Object *obpose = BKE_object_pose_armature_get(obact);
   if (obpose && obpose->pose && obpose->data) {
     if (obpose != obact) {
@@ -393,7 +414,7 @@ static eContextResult screen_ctx_visible_pose_bones(const bContext *C, bContextD
       FOREACH_PCHAN_SELECTED_IN_OBJECT_END;
     }
     else if (obact->mode & OB_MODE_POSE) {
-      FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
+      FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
         FOREACH_PCHAN_VISIBLE_IN_OBJECT_BEGIN (ob_iter, pchan) {
           CTX_data_list_add(result, &ob_iter->id, &RNA_PoseBone, pchan);
         }
@@ -410,8 +431,9 @@ static eContextResult screen_ctx_selected_pose_bones(const bContext *C, bContext
 {
   wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C); /* This may be NULL in a lot of cases. */
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   Object *obpose = BKE_object_pose_armature_get(obact);
   if (obpose && obpose->pose && obpose->data) {
     if (obpose != obact) {
@@ -421,7 +443,7 @@ static eContextResult screen_ctx_selected_pose_bones(const bContext *C, bContext
       FOREACH_PCHAN_SELECTED_IN_OBJECT_END;
     }
     else if (obact->mode & OB_MODE_POSE) {
-      FOREACH_OBJECT_IN_MODE_BEGIN (view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
+      FOREACH_OBJECT_IN_MODE_BEGIN (scene, view_layer, v3d, OB_ARMATURE, OB_MODE_POSE, ob_iter) {
         FOREACH_PCHAN_SELECTED_IN_OBJECT_BEGIN (ob_iter, pchan) {
           CTX_data_list_add(result, &ob_iter->id, &RNA_PoseBone, pchan);
         }
@@ -438,8 +460,10 @@ static eContextResult screen_ctx_selected_pose_bones_from_active_object(const bC
                                                                         bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   Object *obpose = BKE_object_pose_armature_get(obact);
   if (obpose && obpose->pose && obpose->data) {
     if (obpose != obact) {
@@ -462,8 +486,10 @@ static eContextResult screen_ctx_selected_pose_bones_from_active_object(const bC
 static eContextResult screen_ctx_active_bone(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact && obact->type == OB_ARMATURE) {
     bArmature *arm = obact->data;
     if (arm->edbo) {
@@ -484,8 +510,10 @@ static eContextResult screen_ctx_active_bone(const bContext *C, bContextDataResu
 static eContextResult screen_ctx_active_pose_bone(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   Object *obpose = BKE_object_pose_armature_get(obact);
 
   bPoseChannel *pchan = BKE_pose_channel_active_if_layer_visible(obpose);
@@ -498,8 +526,10 @@ static eContextResult screen_ctx_active_pose_bone(const bContext *C, bContextDat
 static eContextResult screen_ctx_active_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (obact) {
     CTX_data_id_pointer_set(result, &obact->id);
@@ -510,8 +540,10 @@ static eContextResult screen_ctx_active_object(const bContext *C, bContextDataRe
 static eContextResult screen_ctx_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (obact) {
     CTX_data_id_pointer_set(result, &obact->id);
@@ -522,8 +554,10 @@ static eContextResult screen_ctx_object(const bContext *C, bContextDataResult *r
 static eContextResult screen_ctx_edit_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   /* convenience for now, 1 object per scene in editmode */
   if (obedit) {
     CTX_data_id_pointer_set(result, &obedit->id);
@@ -534,8 +568,10 @@ static eContextResult screen_ctx_edit_object(const bContext *C, bContextDataResu
 static eContextResult screen_ctx_sculpt_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (obact && (obact->mode & OB_MODE_SCULPT)) {
     CTX_data_id_pointer_set(result, &obact->id);
@@ -546,8 +582,10 @@ static eContextResult screen_ctx_sculpt_object(const bContext *C, bContextDataRe
 static eContextResult screen_ctx_vertex_paint_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact && (obact->mode & OB_MODE_VERTEX_PAINT)) {
     CTX_data_id_pointer_set(result, &obact->id);
   }
@@ -557,8 +595,10 @@ static eContextResult screen_ctx_vertex_paint_object(const bContext *C, bContext
 static eContextResult screen_ctx_weight_paint_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact && (obact->mode & OB_MODE_ALL_WEIGHT_PAINT)) {
     CTX_data_id_pointer_set(result, &obact->id);
   }
@@ -568,8 +608,10 @@ static eContextResult screen_ctx_weight_paint_object(const bContext *C, bContext
 static eContextResult screen_ctx_image_paint_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact && (obact->mode & OB_MODE_TEXTURE_PAINT)) {
     CTX_data_id_pointer_set(result, &obact->id);
   }
@@ -580,8 +622,10 @@ static eContextResult screen_ctx_particle_edit_object(const bContext *C,
                                                       bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact && (obact->mode & OB_MODE_PARTICLE_EDIT)) {
     CTX_data_id_pointer_set(result, &obact->id);
   }
@@ -591,8 +635,10 @@ static eContextResult screen_ctx_particle_edit_object(const bContext *C,
 static eContextResult screen_ctx_pose_object(const bContext *C, bContextDataResult *result)
 {
   wmWindow *win = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   Object *obpose = BKE_object_pose_armature_get(obact);
   if (obpose) {
     CTX_data_id_pointer_set(result, &obpose->id);
@@ -735,8 +781,10 @@ static eContextResult screen_ctx_gpencil_data(const bContext *C, bContextDataRes
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   /* FIXME: for some reason, CTX_data_active_object(C) returns NULL when called from these
    * situations (as outlined above - see Campbell's #ifdefs).
    * That causes the get_active function to fail when called from context.
@@ -754,8 +802,10 @@ static eContextResult screen_ctx_gpencil_data_owner(const bContext *C, bContextD
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   /* Pointer to which data/datablock owns the reference to the Grease Pencil data being used
    * (as gpencil_data). */
@@ -805,8 +855,10 @@ static eContextResult screen_ctx_active_gpencil_layer(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   bGPdata *gpd = ED_gpencil_data_get_active_direct(area, obact);
 
   if (gpd) {
@@ -843,8 +895,10 @@ static eContextResult screen_ctx_active_gpencil_frame(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   bGPdata *gpd = ED_gpencil_data_get_active_direct(area, obact);
 
   if (gpd) {
@@ -862,8 +916,10 @@ static eContextResult screen_ctx_visible_gpencil_layers(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   bGPdata *gpd = ED_gpencil_data_get_active_direct(area, obact);
 
   if (gpd) {
@@ -882,8 +938,10 @@ static eContextResult screen_ctx_editable_gpencil_layers(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   bGPdata *gpd = ED_gpencil_data_get_active_direct(area, obact);
 
   if (gpd) {
@@ -902,8 +960,10 @@ static eContextResult screen_ctx_editable_gpencil_strokes(const bContext *C,
 {
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
+  const Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obact = view_layer->basact ? view_layer->basact->object : NULL;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   bGPdata *gpd = ED_gpencil_data_get_active_direct(area, obact);
   const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd);
@@ -969,6 +1029,7 @@ static eContextResult screen_ctx_active_operator(const bContext *C, bContextData
 }
 static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
                                                   bContextDataResult *result,
+                                                  bool active_only,
                                                   bool editable)
 {
   bAnimContext ac;
@@ -978,11 +1039,17 @@ static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
       SpaceAction *saction = (SpaceAction *)ac.sl;
 
       if (ELEM(saction->mode, SACTCONT_ACTION, SACTCONT_SHAPEKEY)) {
-        if (saction->action && !(editable && ID_IS_LINKED(saction->action))) {
-          CTX_data_id_list_add(result, &saction->action->id);
+        if (active_only) {
+          CTX_data_id_pointer_set(result, (ID *)saction->action);
+        }
+        else {
+          if (saction->action && !(editable && ID_IS_LINKED(saction->action))) {
+            CTX_data_id_list_add(result, &saction->action->id);
+          }
+
+          CTX_data_type_set(result, CTX_DATA_TYPE_COLLECTION);
         }
 
-        CTX_data_type_set(result, CTX_DATA_TYPE_COLLECTION);
         return CTX_RESULT_OK;
       }
     }
@@ -995,7 +1062,8 @@ static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
 
     switch (ac.spacetype) {
       case SPACE_GRAPH:
-        filter |= ANIMFILTER_FCURVESONLY | ANIMFILTER_CURVE_VISIBLE | ANIMFILTER_SEL;
+        filter |= ANIMFILTER_FCURVESONLY | ANIMFILTER_CURVE_VISIBLE |
+                  (active_only ? ANIMFILTER_ACTIVE : ANIMFILTER_SEL);
         break;
 
       case SPACE_ACTION:
@@ -1006,7 +1074,7 @@ static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
 
     ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
-    GSet *seen_set = BLI_gset_ptr_new("seen actions");
+    GSet *seen_set = active_only ? NULL : BLI_gset_ptr_new("seen actions");
 
     LISTBASE_FOREACH (bAnimListElem *, ale, &anim_data) {
       /* In dopesheet check selection status of individual items, skipping
@@ -1019,6 +1087,10 @@ static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
       bAction *action = ANIM_channel_action_get(ale);
 
       if (action) {
+        if (active_only) {
+          CTX_data_id_pointer_set(result, (ID *)action);
+          break;
+        }
         if (editable && ID_IS_LINKED(action)) {
           continue;
         }
@@ -1030,25 +1102,31 @@ static eContextResult screen_ctx_sel_actions_impl(const bContext *C,
       }
     }
 
-    BLI_gset_free(seen_set, NULL);
-
     ANIM_animdata_freelist(&anim_data);
 
-    CTX_data_type_set(result, CTX_DATA_TYPE_COLLECTION);
+    if (!active_only) {
+      BLI_gset_free(seen_set, NULL);
+
+      CTX_data_type_set(result, CTX_DATA_TYPE_COLLECTION);
+    }
+
     return CTX_RESULT_OK;
   }
   return CTX_RESULT_NO_DATA;
 }
-
+static eContextResult screen_ctx_active_action(const bContext *C, bContextDataResult *result)
+{
+  return screen_ctx_sel_actions_impl(C, result, true, false);
+}
 static eContextResult screen_ctx_selected_visible_actions(const bContext *C,
                                                           bContextDataResult *result)
 {
-  return screen_ctx_sel_actions_impl(C, result, false);
+  return screen_ctx_sel_actions_impl(C, result, false, false);
 }
 static eContextResult screen_ctx_selected_editable_actions(const bContext *C,
                                                            bContextDataResult *result)
 {
-  return screen_ctx_sel_actions_impl(C, result, true);
+  return screen_ctx_sel_actions_impl(C, result, false, true);
 }
 static eContextResult screen_ctx_sel_edit_fcurves_(const bContext *C,
                                                    bContextDataResult *result,
@@ -1262,6 +1340,7 @@ static void ensure_ed_screen_context_functions(void)
   register_context_function("editable_gpencil_layers", screen_ctx_editable_gpencil_layers);
   register_context_function("editable_gpencil_strokes", screen_ctx_editable_gpencil_strokes);
   register_context_function("active_operator", screen_ctx_active_operator);
+  register_context_function("active_action", screen_ctx_active_action);
   register_context_function("selected_visible_actions", screen_ctx_selected_visible_actions);
   register_context_function("selected_editable_actions", screen_ctx_selected_editable_actions);
   register_context_function("editable_fcurves", screen_ctx_editable_fcurves);
diff --git a/source/blender/editors/screen/screen_draw.c b/source/blender/editors/screen/screen_draw.c
index 6406b0d9d52..065cb3a61a2 100644
--- a/source/blender/editors/screen/screen_draw.c
+++ b/source/blender/editors/screen/screen_draw.c
@@ -236,7 +236,7 @@ void screen_draw_join_highlight(ScrArea *sa1, ScrArea *sa2)
 
   uint pos_id = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_blend(GPU_BLEND_ALPHA);
 
   /* Highlight source (sa1) within combined area. */
@@ -302,7 +302,7 @@ void screen_draw_join_highlight(ScrArea *sa1, ScrArea *sa2)
 void screen_draw_split_preview(ScrArea *area, const eScreenAxis dir_axis, const float fac)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Split-point. */
   GPU_blend(GPU_BLEND_ALPHA);
@@ -380,7 +380,7 @@ static void screen_preview_draw_areas(const bScreen *screen,
   const float ofs_h = ofs_between_areas * 0.5f;
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4fv(col);
 
   LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
diff --git a/source/blender/editors/screen/screen_edit.c b/source/blender/editors/screen/screen_edit.c
index 08c8c863729..bc7006d2ac7 100644
--- a/source/blender/editors/screen/screen_edit.c
+++ b/source/blender/editors/screen/screen_edit.c
@@ -110,7 +110,7 @@ ScrArea *area_split(const wmWindow *win,
     return NULL;
   }
 
-  /* NOTE(campbell): regarding (fac > 0.5f) checks below.
+  /* NOTE(@campbellbarton): regarding (fac > 0.5f) checks below.
    * normally it shouldn't matter which is used since the copy should match the original
    * however with viewport rendering and python console this isn't the case. */
 
@@ -580,7 +580,7 @@ static void region_cursor_set(wmWindow *win, bool swin_changed)
   }
 }
 
-void ED_screen_do_listen(bContext *C, wmNotifier *note)
+void ED_screen_do_listen(bContext *C, const wmNotifier *note)
 {
   wmWindow *win = CTX_wm_window(C);
   bScreen *screen = CTX_wm_screen(C);
@@ -1163,8 +1163,9 @@ static void screen_set_3dview_camera(Scene *scene,
   /* fix any cameras that are used in the 3d view but not in the scene */
   BKE_screen_view3d_sync(v3d, scene);
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   if (!v3d->camera || !BKE_view_layer_base_find(view_layer, v3d->camera)) {
-    v3d->camera = BKE_view_layer_camera_find(view_layer);
+    v3d->camera = BKE_view_layer_camera_find(scene, view_layer);
     // XXX if (screen == curscreen) handle_view3d_lock();
     if (!v3d->camera) {
       ListBase *regionbase;
@@ -1212,10 +1213,10 @@ void ED_screen_scene_change(bContext *C,
   /* Mode Syncing. */
   if (view_layer_old) {
     WorkSpace *workspace = CTX_wm_workspace(C);
-    Object *obact_new = OBACT(view_layer);
+    Object *obact_new = BKE_view_layer_active_object_get(view_layer);
     UNUSED_VARS(obact_new);
     eObjectMode object_mode_old = workspace->object_mode;
-    Object *obact_old = OBACT(view_layer_old);
+    Object *obact_old = BKE_view_layer_active_object_get(view_layer_old);
     UNUSED_VARS(obact_old, object_mode_old);
   }
 #endif
@@ -1274,7 +1275,7 @@ void ED_screen_full_prevspace(bContext *C, ScrArea *area)
   BLI_assert(area->full);
 
   if (area->flag & AREA_FLAG_STACKED_FULLSCREEN) {
-    /* stacked fullscreen -> only go back to previous area and don't toggle out of fullscreen */
+    /* Stacked full-screen -> only go back to previous area and don't toggle out of full-screen. */
     ED_area_prevspace(C, area);
   }
   else {
@@ -1305,8 +1306,8 @@ void ED_screen_full_restore(bContext *C, ScrArea *area)
   bScreen *screen = CTX_wm_screen(C);
   short state = (screen ? screen->state : SCREENMAXIMIZED);
 
-  /* if fullscreen area has a temporary space (such as a file browser or fullscreen render
-   * overlaid on top of an existing setup) then return to the previous space */
+  /* If full-screen area has a temporary space (such as a file browser or full-screen render
+   * overlaid on top of an existing setup) then return to the previous space. */
 
   if (sl->next) {
     if (sl->link_flag & SPACE_FLAG_TYPE_TEMPORARY) {
diff --git a/source/blender/editors/screen/screen_geometry.c b/source/blender/editors/screen/screen_geometry.c
index 3486ea8b466..3ad3fa7892c 100644
--- a/source/blender/editors/screen/screen_geometry.c
+++ b/source/blender/editors/screen/screen_geometry.c
@@ -284,7 +284,7 @@ short screen_geom_find_area_split_point(const ScrArea *area,
 {
   const int cur_area_width = screen_geom_area_width(area);
   const int cur_area_height = screen_geom_area_height(area);
-  const short area_min_x = AREAMINX;
+  const short area_min_x = AREAMINX * U.dpi_fac;
   const short area_min_y = ED_area_headersize();
 
   /* area big enough? */
diff --git a/source/blender/editors/screen/screen_intern.h b/source/blender/editors/screen/screen_intern.h
index 4c2d94e2018..feda68a51a7 100644
--- a/source/blender/editors/screen/screen_intern.h
+++ b/source/blender/editors/screen/screen_intern.h
@@ -53,7 +53,7 @@ typedef enum eScreenAxis {
 /* area.c */
 
 /**
- * we swap spaces for fullscreen to keep all allocated data area vertices were set
+ * We swap spaces for full-screen to keep all allocated data area vertices were set.
  */
 void ED_area_data_copy(ScrArea *area_dst, ScrArea *area_src, bool do_free);
 void ED_area_data_swap(ScrArea *area_dst, ScrArea *area_src);
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index c616ca2b5eb..29f78b2a0ef 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -723,15 +723,16 @@ typedef struct sActionzoneData {
 static bool actionzone_area_poll(bContext *C)
 {
   wmWindow *win = CTX_wm_window(C);
-  bScreen *screen = WM_window_get_active_screen(win);
-
-  if (screen && win && win->eventstate) {
-    const int *xy = &win->eventstate->xy[0];
+  if (win && win->eventstate) {
+    bScreen *screen = WM_window_get_active_screen(win);
+    if (screen) {
+      const int *xy = &win->eventstate->xy[0];
 
-    LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
-      LISTBASE_FOREACH (AZone *, az, &area->actionzones) {
-        if (BLI_rcti_isect_pt_v(&az->rect, xy)) {
-          return true;
+      LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
+        LISTBASE_FOREACH (AZone *, az, &area->actionzones) {
+          if (BLI_rcti_isect_pt_v(&az->rect, xy)) {
+            return true;
+          }
         }
       }
     }
@@ -858,7 +859,7 @@ static AZone *area_actionzone_refresh_xy(ScrArea *area, const int xy[2], const b
         /* Check if we even have scroll bars. */
         if (((az->direction == AZ_SCROLL_HOR) && !(scroll_flag & V2D_SCROLL_HORIZONTAL)) ||
             ((az->direction == AZ_SCROLL_VERT) && !(scroll_flag & V2D_SCROLL_VERTICAL))) {
-          /* no scrollbars, do nothing. */
+          /* No scroll-bars, do nothing. */
         }
         else if (test_only) {
           if (isect_value != 0) {
@@ -1638,7 +1639,7 @@ static void area_move_set_limits(wmWindow *win,
       }
     }
     else {
-      int areamin = AREAMINX;
+      int areamin = AREAMINX * U.dpi_fac;
 
       if (area->v1->vec.x > window_rect.xmin) {
         areamin += U.pixelsize;
@@ -2061,7 +2062,7 @@ static bool area_split_allowed(const ScrArea *area, const eScreenAxis dir_axis)
     return false;
   }
 
-  if ((dir_axis == SCREEN_AXIS_V && area->winx <= 2 * AREAMINX) ||
+  if ((dir_axis == SCREEN_AXIS_V && area->winx <= 2 * AREAMINX * U.dpi_fac) ||
       (dir_axis == SCREEN_AXIS_H && area->winy <= 2 * ED_area_headersize())) {
     /* Must be at least double minimum sizes to split into two. */
     return false;
@@ -3266,7 +3267,7 @@ static int screen_maximize_area_exec(bContext *C, wmOperator *op)
 
   BLI_assert(!screen->temp);
 
-  /* search current screen for 'fullscreen' areas */
+  /* search current screen for 'full-screen' areas */
   /* prevents restoring info header, when mouse is over it */
   LISTBASE_FOREACH (ScrArea *, area_iter, &screen->areabase) {
     if (area_iter->full) {
@@ -4718,7 +4719,7 @@ static int screen_animation_step_invoke(bContext *C, wmOperator *UNUSED(op), con
 #endif
   }
 
-  /* since we follow drawflags, we can't send notifier but tag regions ourselves */
+  /* Since we follow draw-flags, we can't send notifier but tag regions ourselves. */
   if (depsgraph != NULL) {
     ED_update_for_newframe(bmain, depsgraph);
   }
diff --git a/source/blender/editors/screen/screen_user_menu.c b/source/blender/editors/screen/screen_user_menu.c
index 1156452310c..01c208bf48d 100644
--- a/source/blender/editors/screen/screen_user_menu.c
+++ b/source/blender/editors/screen/screen_user_menu.c
@@ -34,6 +34,7 @@
 #include "UI_resources.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 /* -------------------------------------------------------------------- */
@@ -214,7 +215,14 @@ static void screen_user_menu_draw(const bContext *C, Menu *menu)
         wmOperatorType *ot = WM_operatortype_find(umi_op->op_idname, false);
         if (ot != NULL) {
           IDProperty *prop = umi_op->prop ? IDP_CopyProperty(umi_op->prop) : NULL;
-          uiItemFullO_ptr(menu->layout, ot, ui_name, ICON_NONE, prop, umi_op->opcontext, 0, NULL);
+          uiItemFullO_ptr(menu->layout,
+                          ot,
+                          CTX_IFACE_(ot->translation_context, ui_name),
+                          ICON_NONE,
+                          prop,
+                          umi_op->opcontext,
+                          0,
+                          NULL);
           is_empty = false;
         }
         else {
diff --git a/source/blender/editors/screen/screendump.c b/source/blender/editors/screen/screendump.c
index 5464d0a347d..38a9d8ba7ab 100644
--- a/source/blender/editors/screen/screendump.c
+++ b/source/blender/editors/screen/screendump.c
@@ -54,13 +54,12 @@ static int screenshot_data_create(bContext *C, wmOperator *op, ScrArea *area)
 {
   int dumprect_size[2];
 
-  wmWindowManager *wm = CTX_wm_manager(C);
   wmWindow *win = CTX_wm_window(C);
 
   /* do redraw so we don't show popups/menus */
   WM_redraw_windows(C);
 
-  uint *dumprect = WM_window_pixels_read(wm, win, dumprect_size);
+  uint *dumprect = WM_window_pixels_read_offscreen(C, win, dumprect_size);
 
   if (dumprect) {
     ScreenshotData *scd = MEM_callocN(sizeof(ScreenshotData), "screenshot");
diff --git a/source/blender/editors/screen/workspace_edit.c b/source/blender/editors/screen/workspace_edit.c
index cb29f15420c..9a6bdc98d76 100644
--- a/source/blender/editors/screen/workspace_edit.c
+++ b/source/blender/editors/screen/workspace_edit.c
@@ -220,7 +220,7 @@ WorkSpace *ED_workspace_duplicate(WorkSpace *workspace_old, Main *bmain, wmWindo
   workspace_new->order = workspace_old->order;
   BLI_duplicatelist(&workspace_new->owner_ids, &workspace_old->owner_ids);
 
-  /* TODO(campbell): tools */
+  /* TODO(@campbellbarton): tools */
 
   LISTBASE_FOREACH (WorkSpaceLayout *, layout_old, &workspace_old->layouts) {
     WorkSpaceLayout *layout_new = ED_workspace_layout_duplicate(
@@ -359,6 +359,12 @@ static int workspace_append_activate_exec(bContext *C, wmOperator *op)
       BLO_LIBLINK_APPEND_RECURSIVE);
 
   if (appended_workspace) {
+    if (BLT_translate_new_dataname()) {
+      /* Translate workspace name */
+      BKE_libblock_rename(
+          bmain, &appended_workspace->id, CTX_DATA_(BLT_I18NCONTEXT_ID_WORKSPACE, idname));
+    }
+
     /* Set defaults. */
     BLO_update_defaults_workspace(appended_workspace, NULL);
 
@@ -441,8 +447,14 @@ static void workspace_append_button(uiLayout *layout,
   BLI_assert(STREQ(ot_append->idname, "WORKSPACE_OT_append_activate"));
 
   PointerRNA opptr;
-  uiItemFullO_ptr(
-      layout, ot_append, workspace->id.name + 2, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &opptr);
+  uiItemFullO_ptr(layout,
+                  ot_append,
+                  CTX_DATA_(BLT_I18NCONTEXT_ID_WORKSPACE, workspace->id.name + 2),
+                  ICON_NONE,
+                  NULL,
+                  WM_OP_EXEC_DEFAULT,
+                  0,
+                  &opptr);
   RNA_string_set(&opptr, "idname", id->name + 2);
   RNA_string_set(&opptr, "filepath", filepath);
 }
@@ -495,7 +507,8 @@ static void workspace_add_menu(bContext *UNUSED(C), uiLayout *layout, void *temp
 
 static int workspace_add_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
-  uiPopupMenu *pup = UI_popup_menu_begin(C, op->type->name, ICON_ADD);
+  uiPopupMenu *pup = UI_popup_menu_begin(
+      C, CTX_IFACE_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, op->type->name), ICON_ADD);
   uiLayout *layout = UI_popup_menu_layout(pup);
 
   uiItemMenuF(layout, IFACE_("General"), ICON_NONE, workspace_add_menu, NULL);
@@ -507,7 +520,7 @@ static int workspace_add_invoke(bContext *C, wmOperator *op, const wmEvent *UNUS
     char *template = link->data;
     char display_name[FILE_MAX];
 
-    BLI_path_to_display_name(display_name, sizeof(display_name), template);
+    BLI_path_to_display_name(display_name, sizeof(display_name), IFACE_(template));
 
     /* Steals ownership of link data string. */
     uiItemMenuFN(layout, display_name, ICON_NONE, workspace_add_menu, template);
diff --git a/source/blender/editors/sculpt_paint/CMakeLists.txt b/source/blender/editors/sculpt_paint/CMakeLists.txt
index edb0f1cda4d..2709ac3fd91 100644
--- a/source/blender/editors/sculpt_paint/CMakeLists.txt
+++ b/source/blender/editors/sculpt_paint/CMakeLists.txt
@@ -21,7 +21,6 @@ set(INC
   ../../../../intern/atomic
   ../../../../intern/clog
   ../../../../intern/eigen
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -37,8 +36,8 @@ set(SRC
   curves_sculpt_ops.cc
   curves_sculpt_pinch.cc
   curves_sculpt_puff.cc
-  curves_sculpt_selection_paint.cc
   curves_sculpt_selection.cc
+  curves_sculpt_selection_paint.cc
   curves_sculpt_slide.cc
   curves_sculpt_smooth.cc
   curves_sculpt_snake_hook.cc
@@ -69,7 +68,7 @@ set(SRC
   sculpt_detail.c
   sculpt_dyntopo.c
   sculpt_expand.c
-  sculpt_face_set.c
+  sculpt_face_set.cc
   sculpt_filter_color.c
   sculpt_filter_mask.c
   sculpt_filter_mesh.c
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_add.cc b/source/blender/editors/sculpt_paint/curves_sculpt_add.cc
index 26145a386f5..b5d739ae08e 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_add.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_add.cc
@@ -23,6 +23,8 @@
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_mesh_sample.hh"
+#include "BKE_modifier.h"
+#include "BKE_object.h"
 #include "BKE_paint.h"
 #include "BKE_report.h"
 
@@ -42,6 +44,8 @@
 
 #include "WM_api.h"
 
+#include "DEG_depsgraph_query.h"
+
 /**
  * The code below uses a suffix naming convention to indicate the coordinate space:
  * cu: Local space of the curves object that is being edited.
@@ -80,13 +84,17 @@ struct AddOperationExecutor {
   AddOperation *self_ = nullptr;
   CurvesSculptCommonContext ctx_;
 
-  Object *object_ = nullptr;
-  Curves *curves_id_ = nullptr;
-  CurvesGeometry *curves_ = nullptr;
+  Object *curves_ob_orig_ = nullptr;
+  Curves *curves_id_orig_ = nullptr;
+  CurvesGeometry *curves_orig_ = nullptr;
 
-  Object *surface_ob_ = nullptr;
-  Mesh *surface_ = nullptr;
-  Span<MLoopTri> surface_looptris_;
+  Object *surface_ob_eval_ = nullptr;
+  Mesh *surface_eval_ = nullptr;
+  Span<MVert> surface_verts_eval_;
+  Span<MLoop> surface_loops_eval_;
+  Span<MLoopTri> surface_looptris_eval_;
+  VArraySpan<float2> surface_uv_map_eval_;
+  BVHTreeFromMesh surface_bvh_eval_;
 
   const CurvesSculpt *curves_sculpt_ = nullptr;
   const Brush *brush_ = nullptr;
@@ -99,14 +107,6 @@ struct AddOperationExecutor {
 
   CurvesSurfaceTransforms transforms_;
 
-  BVHTreeFromMesh surface_bvh_;
-
-  struct AddedPoints {
-    Vector<float3> positions_cu;
-    Vector<float3> bary_coords;
-    Vector<int> looptri_indices;
-  };
-
   AddOperationExecutor(const bContext &C) : ctx_(C)
   {
   }
@@ -114,19 +114,40 @@ struct AddOperationExecutor {
   void execute(AddOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
   {
     self_ = &self;
-    object_ = CTX_data_active_object(&C);
+    curves_ob_orig_ = CTX_data_active_object(&C);
 
-    curves_id_ = static_cast<Curves *>(object_->data);
-    curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
+    curves_id_orig_ = static_cast<Curves *>(curves_ob_orig_->data);
+    curves_orig_ = &CurvesGeometry::wrap(curves_id_orig_->geometry);
 
-    if (curves_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
+    if (curves_id_orig_->surface == nullptr || curves_id_orig_->surface->type != OB_MESH) {
+      report_missing_surface(stroke_extension.reports);
       return;
     }
 
-    transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
+    transforms_ = CurvesSurfaceTransforms(*curves_ob_orig_, curves_id_orig_->surface);
 
-    surface_ob_ = curves_id_->surface;
-    surface_ = static_cast<Mesh *>(surface_ob_->data);
+    Object &surface_ob_orig = *curves_id_orig_->surface;
+    Mesh &surface_orig = *static_cast<Mesh *>(surface_ob_orig.data);
+    if (surface_orig.totpoly == 0) {
+      report_empty_original_surface(stroke_extension.reports);
+      return;
+    }
+
+    surface_ob_eval_ = DEG_get_evaluated_object(ctx_.depsgraph, &surface_ob_orig);
+    if (surface_ob_eval_ == nullptr) {
+      return;
+    }
+    surface_eval_ = BKE_object_get_evaluated_mesh(surface_ob_eval_);
+    if (surface_eval_->totpoly == 0) {
+      report_empty_evaluated_surface(stroke_extension.reports);
+      return;
+    }
+    surface_verts_eval_ = surface_eval_->verts();
+    surface_loops_eval_ = surface_eval_->loops();
+    surface_looptris_eval_ = {BKE_mesh_runtime_looptri_ensure(surface_eval_),
+                              BKE_mesh_runtime_looptri_len(surface_eval_)};
+    BKE_bvhtree_from_mesh_get(&surface_bvh_eval_, surface_eval_, BVHTREE_FROM_LOOPTRI, 2);
+    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval_); });
 
     curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
     brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
@@ -143,56 +164,63 @@ struct AddOperationExecutor {
       return;
     }
 
+    /* Find UV map. */
+    VArraySpan<float2> surface_uv_map;
+    if (curves_id_orig_->surface_uv_map != nullptr) {
+      surface_uv_map = surface_orig.attributes().lookup<float2>(curves_id_orig_->surface_uv_map,
+                                                                ATTR_DOMAIN_CORNER);
+      surface_uv_map_eval_ = surface_eval_->attributes().lookup<float2>(
+          curves_id_orig_->surface_uv_map, ATTR_DOMAIN_CORNER);
+    }
+
+    if (surface_uv_map.is_empty()) {
+      report_missing_uv_map_on_original_surface(stroke_extension.reports);
+      return;
+    }
+    if (surface_uv_map_eval_.is_empty()) {
+      report_missing_uv_map_on_evaluated_surface(stroke_extension.reports);
+      return;
+    }
+
     const double time = PIL_check_seconds_timer() * 1000000.0;
     /* Use a pointer cast to avoid overflow warnings. */
     RandomNumberGenerator rng{*(uint32_t *)(&time)};
 
-    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
-    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
-
-    surface_looptris_ = {BKE_mesh_runtime_looptri_ensure(surface_),
-                         BKE_mesh_runtime_looptri_len(surface_)};
-
     /* Sample points on the surface using one of multiple strategies. */
-    AddedPoints added_points;
+    Vector<float2> sampled_uvs;
     if (add_amount_ == 1) {
-      this->sample_in_center_with_symmetry(added_points);
+      this->sample_in_center_with_symmetry(sampled_uvs);
     }
     else if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
-      this->sample_projected_with_symmetry(rng, added_points);
+      this->sample_projected_with_symmetry(rng, sampled_uvs);
     }
     else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
-      this->sample_spherical_with_symmetry(rng, added_points);
+      this->sample_spherical_with_symmetry(rng, sampled_uvs);
     }
     else {
       BLI_assert_unreachable();
     }
 
-    if (added_points.bary_coords.is_empty()) {
+    if (sampled_uvs.is_empty()) {
       /* No new points have been added. */
       return;
     }
 
-    /* Find UV map. */
-    VArraySpan<float2> surface_uv_map;
-    if (curves_id_->surface_uv_map != nullptr) {
-      const bke::AttributeAccessor surface_attributes = bke::mesh_attributes(*surface_);
-      surface_uv_map = surface_attributes.lookup<float2>(curves_id_->surface_uv_map,
-                                                         ATTR_DOMAIN_CORNER);
-    }
+    const Span<MLoopTri> surface_looptris_orig = {BKE_mesh_runtime_looptri_ensure(&surface_orig),
+                                                  BKE_mesh_runtime_looptri_len(&surface_orig)};
 
     /* Find normals. */
-    if (!CustomData_has_layer(&surface_->ldata, CD_NORMAL)) {
-      BKE_mesh_calc_normals_split(surface_);
+    if (!CustomData_has_layer(&surface_orig.ldata, CD_NORMAL)) {
+      BKE_mesh_calc_normals_split(&surface_orig);
     }
     const Span<float3> corner_normals_su = {
-        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_->ldata, CD_NORMAL)),
-        surface_->totloop};
+        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_orig.ldata, CD_NORMAL)),
+        surface_orig.totloop};
+
+    const geometry::ReverseUVSampler reverse_uv_sampler{surface_uv_map, surface_looptris_orig};
 
     geometry::AddCurvesOnMeshInputs add_inputs;
-    add_inputs.root_positions_cu = added_points.positions_cu;
-    add_inputs.bary_coords = added_points.bary_coords;
-    add_inputs.looptri_indices = added_points.looptri_indices;
+    add_inputs.uvs = sampled_uvs;
     add_inputs.interpolate_length = brush_settings_->flag &
                                     BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_LENGTH;
     add_inputs.interpolate_shape = brush_settings_->flag &
@@ -201,13 +229,10 @@ struct AddOperationExecutor {
                                          BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_POINT_COUNT;
     add_inputs.fallback_curve_length = brush_settings_->curve_length;
     add_inputs.fallback_point_count = std::max(2, brush_settings_->points_per_curve);
-    add_inputs.surface = surface_;
-    add_inputs.surface_bvh = &surface_bvh_;
-    add_inputs.surface_looptris = surface_looptris_;
-    add_inputs.surface_uv_map = surface_uv_map;
+    add_inputs.transforms = &transforms_;
+    add_inputs.reverse_uv_sampler = &reverse_uv_sampler;
+    add_inputs.surface = &surface_orig;
     add_inputs.corner_normals_su = corner_normals_su;
-    add_inputs.curves_to_surface_mat = transforms_.curves_to_surface;
-    add_inputs.surface_to_curves_normal_mat = transforms_.surface_to_curves_normal;
 
     if (add_inputs.interpolate_length || add_inputs.interpolate_shape ||
         add_inputs.interpolate_point_count) {
@@ -215,17 +240,22 @@ struct AddOperationExecutor {
       add_inputs.old_roots_kdtree = self_->curve_roots_kdtree_;
     }
 
-    geometry::add_curves_on_mesh(*curves_, add_inputs);
+    const geometry::AddCurvesOnMeshOutputs add_outputs = geometry::add_curves_on_mesh(
+        *curves_orig_, add_inputs);
+
+    if (add_outputs.uv_error) {
+      report_invalid_uv_map(stroke_extension.reports);
+    }
 
-    DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
-    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
+    DEG_id_tag_update(&curves_id_orig_->id, ID_RECALC_GEOMETRY);
+    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_orig_->id);
     ED_region_tag_redraw(ctx_.region);
   }
 
   /**
    * Sample a single point exactly at the mouse position.
    */
-  void sample_in_center_with_symmetry(AddedPoints &r_added_points)
+  void sample_in_center_with_symmetry(Vector<float2> &r_sampled_uvs)
   {
     float3 ray_start_wo, ray_end_wo;
     ED_view3d_win_to_segment_clipped(
@@ -234,15 +264,15 @@ struct AddOperationExecutor {
     const float3 ray_end_cu = transforms_.world_to_curves * ray_end_wo;
 
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
 
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       const float4x4 transform = transforms_.curves_to_surface * brush_transform;
-      this->sample_in_center(r_added_points, transform * ray_start_cu, transform * ray_end_cu);
+      this->sample_in_center(r_sampled_uvs, transform * ray_start_cu, transform * ray_end_cu);
     }
   }
 
-  void sample_in_center(AddedPoints &r_added_points,
+  void sample_in_center(Vector<float2> &r_sampled_uvs,
                         const float3 &ray_start_su,
                         const float3 &ray_end_su)
   {
@@ -251,58 +281,61 @@ struct AddOperationExecutor {
     BVHTreeRayHit ray_hit;
     ray_hit.dist = FLT_MAX;
     ray_hit.index = -1;
-    BLI_bvhtree_ray_cast(surface_bvh_.tree,
+    BLI_bvhtree_ray_cast(surface_bvh_eval_.tree,
                          ray_start_su,
                          ray_direction_su,
                          0.0f,
                          &ray_hit,
-                         surface_bvh_.raycast_callback,
-                         &surface_bvh_);
+                         surface_bvh_eval_.raycast_callback,
+                         &surface_bvh_eval_);
 
     if (ray_hit.index == -1) {
       return;
     }
 
     const int looptri_index = ray_hit.index;
+    const MLoopTri &looptri = surface_looptris_eval_[looptri_index];
     const float3 brush_pos_su = ray_hit.co;
     const float3 bary_coords = bke::mesh_surface_sample::compute_bary_coord_in_triangle(
-        *surface_, surface_looptris_[looptri_index], brush_pos_su);
+        surface_verts_eval_, surface_loops_eval_, looptri, brush_pos_su);
 
-    const float3 brush_pos_cu = transforms_.surface_to_curves * brush_pos_su;
-
-    r_added_points.positions_cu.append(brush_pos_cu);
-    r_added_points.bary_coords.append(bary_coords);
-    r_added_points.looptri_indices.append(looptri_index);
+    const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
+        bary_coords, looptri, surface_uv_map_eval_);
+    r_sampled_uvs.append(uv);
   }
 
   /**
    * Sample points by shooting rays within the brush radius in the 3D view.
    */
-  void sample_projected_with_symmetry(RandomNumberGenerator &rng, AddedPoints &r_added_points)
+  void sample_projected_with_symmetry(RandomNumberGenerator &rng, Vector<float2> &r_sampled_uvs)
   {
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
-      this->sample_projected(rng, r_added_points, brush_transform);
+      this->sample_projected(rng, r_sampled_uvs, brush_transform);
     }
   }
 
   void sample_projected(RandomNumberGenerator &rng,
-                        AddedPoints &r_added_points,
+                        Vector<float2> &r_sampled_uvs,
                         const float4x4 &brush_transform)
   {
-    const int old_amount = r_added_points.bary_coords.size();
+    const int old_amount = r_sampled_uvs.size();
     const int max_iterations = 100;
     int current_iteration = 0;
-    while (r_added_points.bary_coords.size() < old_amount + add_amount_) {
+    while (r_sampled_uvs.size() < old_amount + add_amount_) {
       if (current_iteration++ >= max_iterations) {
         break;
       }
-      const int missing_amount = add_amount_ + old_amount - r_added_points.bary_coords.size();
+      Vector<float3> bary_coords;
+      Vector<int> looptri_indices;
+      Vector<float3> positions_su;
+
+      const int missing_amount = add_amount_ + old_amount - r_sampled_uvs.size();
       const int new_points = bke::mesh_surface_sample::sample_surface_points_projected(
           rng,
-          *surface_,
-          surface_bvh_,
+          *surface_eval_,
+          surface_bvh_eval_,
           brush_pos_re_,
           brush_radius_re_,
           [&](const float2 &pos_re, float3 &r_start_su, float3 &r_end_su) {
@@ -317,11 +350,14 @@ struct AddOperationExecutor {
           use_front_face_,
           add_amount_,
           missing_amount,
-          r_added_points.bary_coords,
-          r_added_points.looptri_indices,
-          r_added_points.positions_cu);
-      for (float3 &pos : r_added_points.positions_cu.as_mutable_span().take_back(new_points)) {
-        pos = transforms_.surface_to_curves * pos;
+          bary_coords,
+          looptri_indices,
+          positions_su);
+
+      for (const int i : IndexRange(new_points)) {
+        const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
+            bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
+        r_sampled_uvs.append(uv);
       }
     }
   }
@@ -329,13 +365,13 @@ struct AddOperationExecutor {
   /**
    * Sample points in a 3D sphere around the surface position that the mouse hovers over.
    */
-  void sample_spherical_with_symmetry(RandomNumberGenerator &rng, AddedPoints &r_added_points)
+  void sample_spherical_with_symmetry(RandomNumberGenerator &rng, Vector<float2> &r_sampled_uvs)
   {
     const std::optional<CurvesBrush3D> brush_3d = sample_curves_surface_3d_brush(*ctx_.depsgraph,
                                                                                  *ctx_.region,
                                                                                  *ctx_.v3d,
                                                                                  transforms_,
-                                                                                 surface_bvh_,
+                                                                                 surface_bvh_eval_,
                                                                                  brush_pos_re_,
                                                                                  brush_radius_re_);
     if (!brush_3d.has_value()) {
@@ -355,7 +391,7 @@ struct AddOperationExecutor {
     const float3 view_ray_end_cu = transforms_.world_to_curves * view_ray_end_wo;
 
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       const float4x4 transform = transforms_.curves_to_surface * brush_transform;
 
@@ -365,13 +401,12 @@ struct AddOperationExecutor {
       const float brush_radius_su = transform_brush_radius(
           transform, brush_3d->position_cu, brush_3d->radius_cu);
 
-      this->sample_spherical(
-          rng, r_added_points, brush_pos_su, brush_radius_su, view_direction_su);
+      this->sample_spherical(rng, r_sampled_uvs, brush_pos_su, brush_radius_su, view_direction_su);
     }
   }
 
   void sample_spherical(RandomNumberGenerator &rng,
-                        AddedPoints &r_added_points,
+                        Vector<float2> &r_sampled_uvs,
                         const float3 &brush_pos_su,
                         const float brush_radius_su,
                         const float3 &view_direction_su)
@@ -379,32 +414,32 @@ struct AddOperationExecutor {
     const float brush_radius_sq_su = pow2f(brush_radius_su);
 
     /* Find surface triangles within brush radius. */
-    Vector<int> looptri_indices;
+    Vector<int> selected_looptri_indices;
     if (use_front_face_) {
       BLI_bvhtree_range_query_cpp(
-          *surface_bvh_.tree,
+          *surface_bvh_eval_.tree,
           brush_pos_su,
           brush_radius_su,
           [&](const int index, const float3 &UNUSED(co), const float UNUSED(dist_sq)) {
-            const MLoopTri &looptri = surface_looptris_[index];
-            const float3 v0_su = surface_->mvert[surface_->mloop[looptri.tri[0]].v].co;
-            const float3 v1_su = surface_->mvert[surface_->mloop[looptri.tri[1]].v].co;
-            const float3 v2_su = surface_->mvert[surface_->mloop[looptri.tri[2]].v].co;
+            const MLoopTri &looptri = surface_looptris_eval_[index];
+            const float3 v0_su = surface_verts_eval_[surface_loops_eval_[looptri.tri[0]].v].co;
+            const float3 v1_su = surface_verts_eval_[surface_loops_eval_[looptri.tri[1]].v].co;
+            const float3 v2_su = surface_verts_eval_[surface_loops_eval_[looptri.tri[2]].v].co;
             float3 normal_su;
             normal_tri_v3(normal_su, v0_su, v1_su, v2_su);
             if (math::dot(normal_su, view_direction_su) >= 0.0f) {
               return;
             }
-            looptri_indices.append(index);
+            selected_looptri_indices.append(index);
           });
     }
     else {
       BLI_bvhtree_range_query_cpp(
-          *surface_bvh_.tree,
+          *surface_bvh_eval_.tree,
           brush_pos_su,
           brush_radius_su,
           [&](const int index, const float3 &UNUSED(co), const float UNUSED(dist_sq)) {
-            looptri_indices.append(index);
+            selected_looptri_indices.append(index);
           });
     }
 
@@ -418,42 +453,45 @@ struct AddOperationExecutor {
     const int max_iterations = 5;
     int current_iteration = 0;
 
-    const int old_amount = r_added_points.bary_coords.size();
-    while (r_added_points.bary_coords.size() < old_amount + add_amount_) {
+    const int old_amount = r_sampled_uvs.size();
+    while (r_sampled_uvs.size() < old_amount + add_amount_) {
       if (current_iteration++ >= max_iterations) {
         break;
       }
+      Vector<float3> bary_coords;
+      Vector<int> looptri_indices;
+      Vector<float3> positions_su;
       const int new_points = bke::mesh_surface_sample::sample_surface_points_spherical(
           rng,
-          *surface_,
-          looptri_indices,
+          *surface_eval_,
+          selected_looptri_indices,
           brush_pos_su,
           brush_radius_su,
           approximate_density_su,
-          r_added_points.bary_coords,
-          r_added_points.looptri_indices,
-          r_added_points.positions_cu);
-      for (float3 &pos : r_added_points.positions_cu.as_mutable_span().take_back(new_points)) {
-        pos = transforms_.surface_to_curves * pos;
+          bary_coords,
+          looptri_indices,
+          positions_su);
+      for (const int i : IndexRange(new_points)) {
+        const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
+            bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
+        r_sampled_uvs.append(uv);
       }
     }
 
     /* Remove samples when there are too many. */
-    while (r_added_points.bary_coords.size() > old_amount + add_amount_) {
+    while (r_sampled_uvs.size() > old_amount + add_amount_) {
       const int index_to_remove = rng.get_int32(add_amount_) + old_amount;
-      r_added_points.bary_coords.remove_and_reorder(index_to_remove);
-      r_added_points.looptri_indices.remove_and_reorder(index_to_remove);
-      r_added_points.positions_cu.remove_and_reorder(index_to_remove);
+      r_sampled_uvs.remove_and_reorder(index_to_remove);
     }
   }
 
   void ensure_curve_roots_kdtree()
   {
     if (self_->curve_roots_kdtree_ == nullptr) {
-      self_->curve_roots_kdtree_ = BLI_kdtree_3d_new(curves_->curves_num());
-      for (const int curve_i : curves_->curves_range()) {
-        const int root_point_i = curves_->offsets()[curve_i];
-        const float3 &root_pos_cu = curves_->positions()[root_point_i];
+      self_->curve_roots_kdtree_ = BLI_kdtree_3d_new(curves_orig_->curves_num());
+      for (const int curve_i : curves_orig_->curves_range()) {
+        const int root_point_i = curves_orig_->offsets()[curve_i];
+        const float3 &root_pos_cu = curves_orig_->positions()[root_point_i];
         BLI_kdtree_3d_insert(self_->curve_roots_kdtree_, curve_i, root_pos_cu);
       }
       BLI_kdtree_3d_balance(self_->curve_roots_kdtree_);
@@ -467,17 +505,8 @@ void AddOperation::on_stroke_extended(const bContext &C, const StrokeExtension &
   executor.execute(*this, C, stroke_extension);
 }
 
-std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation(const bContext &C,
-                                                               ReportList *reports)
+std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation()
 {
-  const Object &ob_active = *CTX_data_active_object(&C);
-  BLI_assert(ob_active.type == OB_CURVES);
-  const Curves &curves_id = *static_cast<Curves *>(ob_active.data);
-  if (curves_id.surface == nullptr || curves_id.surface->type != OB_MESH) {
-    BKE_report(reports, RPT_WARNING, "Can not use Add brush when there is no surface mesh");
-    return {};
-  }
-
   return std::make_unique<AddOperation>();
 }
 
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_brush.cc b/source/blender/editors/sculpt_paint/curves_sculpt_brush.cc
index 10564942ab9..02bf7aacd93 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_brush.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_brush.cc
@@ -8,6 +8,9 @@
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
 #include "BKE_curves.hh"
+#include "BKE_modifier.h"
+#include "BKE_object.h"
+#include "BKE_report.h"
 
 #include "ED_view3d.h"
 
@@ -20,6 +23,10 @@
 #include "BLI_length_parameterize.hh"
 #include "BLI_task.hh"
 
+#include "DEG_depsgraph_query.h"
+
+#include "BLT_translation.h"
+
 /**
  * The code below uses a prefix naming convention to indicate the coordinate space:
  * cu: Local space of the curves object that is being edited.
@@ -48,7 +55,8 @@ static std::optional<float3> find_curves_brush_position(const CurvesGeometry &cu
                                                         const float brush_radius_re,
                                                         const ARegion &region,
                                                         const RegionView3D &rv3d,
-                                                        const Object &object)
+                                                        const Object &object,
+                                                        const Span<float3> positions)
 {
   /* This value might have to be adjusted based on user feedback. */
   const float brush_inner_radius_re = std::min<float>(brush_radius_re, (float)UI_UNIT_X / 3.0f);
@@ -88,8 +96,6 @@ static std::optional<float3> find_curves_brush_position(const CurvesGeometry &cu
     }
   };
 
-  const Span<float3> positions = curves.positions();
-
   BrushPositionCandidate best_candidate = threading::parallel_reduce(
       curves.curves_range(),
       128,
@@ -175,20 +181,21 @@ std::optional<CurvesBrush3D> sample_curves_3d_brush(const Depsgraph &depsgraph,
 {
   const Curves &curves_id = *static_cast<Curves *>(curves_object.data);
   const CurvesGeometry &curves = CurvesGeometry::wrap(curves_id.geometry);
-  const Object *surface_object = curves_id.surface;
+  Object *surface_object = curves_id.surface;
+  Object *surface_object_eval = DEG_get_evaluated_object(&depsgraph, surface_object);
 
   float3 center_ray_start_wo, center_ray_end_wo;
   ED_view3d_win_to_segment_clipped(
       &depsgraph, &region, &v3d, brush_pos_re, center_ray_start_wo, center_ray_end_wo, true);
 
   /* Shorten ray when the surface object is hit. */
-  if (surface_object != nullptr) {
+  if (surface_object_eval != nullptr) {
     const float4x4 surface_to_world_mat = surface_object->obmat;
     const float4x4 world_to_surface_mat = surface_to_world_mat.inverted();
 
-    Mesh &surface = *static_cast<Mesh *>(surface_object->data);
+    Mesh *surface_eval = BKE_object_get_evaluated_mesh(surface_object_eval);
     BVHTreeFromMesh surface_bvh;
-    BKE_bvhtree_from_mesh_get(&surface_bvh, &surface, BVHTREE_FROM_LOOPTRI, 2);
+    BKE_bvhtree_from_mesh_get(&surface_bvh, surface_eval, BVHTREE_FROM_LOOPTRI, 2);
     BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh); });
 
     const float3 center_ray_start_su = world_to_surface_mat * center_ray_start_wo;
@@ -222,6 +229,9 @@ std::optional<CurvesBrush3D> sample_curves_3d_brush(const Depsgraph &depsgraph,
   const float3 center_ray_start_cu = world_to_curves_mat * center_ray_start_wo;
   const float3 center_ray_end_cu = world_to_curves_mat * center_ray_end_wo;
 
+  const bke::crazyspace::GeometryDeformation deformation =
+      bke::crazyspace::get_evaluated_curves_deformation(depsgraph, curves_object);
+
   const std::optional<float3> brush_position_optional_cu = find_curves_brush_position(
       curves,
       center_ray_start_cu,
@@ -229,7 +239,8 @@ std::optional<CurvesBrush3D> sample_curves_3d_brush(const Depsgraph &depsgraph,
       brush_radius_re,
       region,
       rv3d,
-      curves_object);
+      curves_object,
+      deformation.positions);
   if (!brush_position_optional_cu.has_value()) {
     /* Nothing found. */
     return std::nullopt;
@@ -341,33 +352,37 @@ float transform_brush_radius(const float4x4 &transform,
   return math::distance(new_position, new_offset_position);
 }
 
-void move_last_point_and_resample(MutableSpan<float3> positions, const float3 &new_last_position)
+void move_last_point_and_resample(MoveAndResampleBuffers &buffer,
+                                  MutableSpan<float3> positions,
+                                  const float3 &new_last_position)
 {
   /* Find the accumulated length of each point in the original curve,
    * treating it as a poly curve for performance reasons and simplicity. */
-  Array<float> orig_lengths(length_parameterize::segments_num(positions.size(), false));
-  length_parameterize::accumulate_lengths<float3>(positions, false, orig_lengths);
-  const float orig_total_length = orig_lengths.last();
+  buffer.orig_lengths.reinitialize(length_parameterize::segments_num(positions.size(), false));
+  length_parameterize::accumulate_lengths<float3>(positions, false, buffer.orig_lengths);
+  const float orig_total_length = buffer.orig_lengths.last();
 
   /* Find the factor by which the new curve is shorter or longer than the original. */
   const float new_last_segment_length = math::distance(positions.last(1), new_last_position);
-  const float new_total_length = orig_lengths.last(1) + new_last_segment_length;
+  const float new_total_length = buffer.orig_lengths.last(1) + new_last_segment_length;
   const float length_factor = safe_divide(new_total_length, orig_total_length);
 
   /* Calculate the lengths to sample the original curve with by scaling the original lengths. */
-  Array<float> new_lengths(positions.size() - 1);
-  new_lengths.first() = 0.0f;
-  for (const int i : new_lengths.index_range().drop_front(1)) {
-    new_lengths[i] = orig_lengths[i - 1] * length_factor;
+  buffer.new_lengths.reinitialize(positions.size() - 1);
+  buffer.new_lengths.first() = 0.0f;
+  for (const int i : buffer.new_lengths.index_range().drop_front(1)) {
+    buffer.new_lengths[i] = buffer.orig_lengths[i - 1] * length_factor;
   }
 
-  Array<int> indices(positions.size() - 1);
-  Array<float> factors(positions.size() - 1);
-  length_parameterize::sample_at_lengths(orig_lengths, new_lengths, indices, factors);
+  buffer.sample_indices.reinitialize(positions.size() - 1);
+  buffer.sample_factors.reinitialize(positions.size() - 1);
+  length_parameterize::sample_at_lengths(
+      buffer.orig_lengths, buffer.new_lengths, buffer.sample_indices, buffer.sample_factors);
 
-  Array<float3> new_positions(positions.size() - 1);
-  length_parameterize::linear_interpolation<float3>(positions, indices, factors, new_positions);
-  positions.drop_back(1).copy_from(new_positions);
+  buffer.new_positions.reinitialize(positions.size() - 1);
+  length_parameterize::interpolate<float3>(
+      positions, buffer.sample_indices, buffer.sample_factors, buffer.new_positions);
+  positions.drop_back(1).copy_from(buffer.new_positions);
   positions.last() = new_last_position;
 }
 
@@ -380,4 +395,36 @@ CurvesSculptCommonContext::CurvesSculptCommonContext(const bContext &C)
   this->rv3d = CTX_wm_region_view3d(&C);
 }
 
+void report_empty_original_surface(ReportList *reports)
+{
+  BKE_report(reports, RPT_WARNING, TIP_("Original surface mesh is empty"));
+}
+
+void report_empty_evaluated_surface(ReportList *reports)
+{
+  BKE_report(reports, RPT_WARNING, TIP_("Evaluated surface mesh is empty"));
+}
+
+void report_missing_surface(ReportList *reports)
+{
+  BKE_report(reports, RPT_WARNING, TIP_("Missing surface mesh"));
+}
+
+void report_missing_uv_map_on_original_surface(ReportList *reports)
+{
+  BKE_report(
+      reports, RPT_WARNING, TIP_("Missing UV map for attaching curves on original surface"));
+}
+
+void report_missing_uv_map_on_evaluated_surface(ReportList *reports)
+{
+  BKE_report(
+      reports, RPT_WARNING, TIP_("Missing UV map for attaching curves on evaluated surface"));
+}
+
+void report_invalid_uv_map(ReportList *reports)
+{
+  BKE_report(reports, RPT_WARNING, TIP_("Invalid UV map: UV islands must not overlap"));
+}
+
 }  // namespace blender::ed::sculpt_paint
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_comb.cc b/source/blender/editors/sculpt_paint/curves_sculpt_comb.cc
index 449f1786167..52f2ddc6550 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_comb.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_comb.cc
@@ -13,12 +13,15 @@
 #include "PIL_time.h"
 
 #include "DEG_depsgraph.h"
+#include "DEG_depsgraph_query.h"
 
 #include "BKE_attribute_math.hh"
 #include "BKE_brush.h"
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
+#include "BKE_crazyspace.hh"
 #include "BKE_curves.hh"
+#include "BKE_geometry_set.hh"
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_paint.h"
@@ -88,9 +91,9 @@ struct CombOperationExecutor {
 
   eBrushFalloffShape falloff_shape_;
 
-  Object *object_ = nullptr;
-  Curves *curves_id_ = nullptr;
-  CurvesGeometry *curves_ = nullptr;
+  Object *curves_ob_orig_ = nullptr;
+  Curves *curves_id_orig_ = nullptr;
+  CurvesGeometry *curves_orig_ = nullptr;
 
   VArray<float> point_factors_;
   Vector<int64_t> selected_curve_indices_;
@@ -112,7 +115,12 @@ struct CombOperationExecutor {
 
     BLI_SCOPED_DEFER([&]() { self_->brush_pos_last_re_ = stroke_extension.mouse_position; });
 
-    object_ = CTX_data_active_object(&C);
+    curves_ob_orig_ = CTX_data_active_object(&C);
+    curves_id_orig_ = static_cast<Curves *>(curves_ob_orig_->data);
+    curves_orig_ = &CurvesGeometry::wrap(curves_id_orig_->geometry);
+    if (curves_orig_->curves_num() == 0) {
+      return;
+    }
 
     curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
     brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
@@ -122,16 +130,10 @@ struct CombOperationExecutor {
 
     falloff_shape_ = static_cast<eBrushFalloffShape>(brush_->falloff_shape);
 
-    curves_id_ = static_cast<Curves *>(object_->data);
-    curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
-    if (curves_->curves_num() == 0) {
-      return;
-    }
-
-    transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
+    transforms_ = CurvesSurfaceTransforms(*curves_ob_orig_, curves_id_orig_->surface);
 
-    point_factors_ = get_point_selection(*curves_id_);
-    curve_selection_ = retrieve_selected_curves(*curves_id_, selected_curve_indices_);
+    point_factors_ = get_point_selection(*curves_id_orig_);
+    curve_selection_ = retrieve_selected_curves(*curves_id_orig_, selected_curve_indices_);
 
     brush_pos_prev_re_ = self_->brush_pos_last_re_;
     brush_pos_re_ = stroke_extension.mouse_position;
@@ -160,9 +162,9 @@ struct CombOperationExecutor {
 
     this->restore_segment_lengths(changed_curves);
 
-    curves_->tag_positions_changed();
-    DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
-    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
+    curves_orig_->tag_positions_changed();
+    DEG_id_tag_update(&curves_id_orig_->id, ID_RECALC_GEOMETRY);
+    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_orig_->id);
     ED_region_tag_redraw(ctx_.region);
   }
 
@@ -172,7 +174,7 @@ struct CombOperationExecutor {
   void comb_projected_with_symmetry(EnumerableThreadSpecific<Vector<int>> &r_changed_curves)
   {
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       this->comb_projected(r_changed_curves, brush_transform);
     }
@@ -183,10 +185,12 @@ struct CombOperationExecutor {
   {
     const float4x4 brush_transform_inv = brush_transform.inverted();
 
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
+    MutableSpan<float3> positions_cu_orig = curves_orig_->positions_for_write();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *curves_ob_orig_);
 
     float4x4 projection;
-    ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
+    ED_view3d_ob_project_mat_get(ctx_.rv3d, curves_ob_orig_, projection.values);
 
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
@@ -195,16 +199,18 @@ struct CombOperationExecutor {
       Vector<int> &local_changed_curves = r_changed_curves.local();
       for (const int curve_i : curve_selection_.slice(range)) {
         bool curve_changed = false;
-        const IndexRange points = curves_->points_for_curve(curve_i);
+        const IndexRange points = curves_orig_->points_for_curve(curve_i);
         for (const int point_i : points.drop_front(1)) {
-          const float3 old_pos_cu = brush_transform_inv * positions_cu[point_i];
+          const float3 old_pos_cu = deformation.positions[point_i];
+          const float3 old_symm_pos_cu = brush_transform_inv * old_pos_cu;
 
           /* Find the position of the point in screen space. */
-          float2 old_pos_re;
-          ED_view3d_project_float_v2_m4(ctx_.region, old_pos_cu, old_pos_re, projection.values);
+          float2 old_symm_pos_re;
+          ED_view3d_project_float_v2_m4(
+              ctx_.region, old_symm_pos_cu, old_symm_pos_re, projection.values);
 
           const float distance_to_brush_sq_re = dist_squared_to_line_segment_v2(
-              old_pos_re, brush_pos_prev_re_, brush_pos_re_);
+              old_symm_pos_re, brush_pos_prev_re_, brush_pos_re_);
           if (distance_to_brush_sq_re > brush_radius_sq_re) {
             /* Ignore the point because it's too far away. */
             continue;
@@ -219,16 +225,20 @@ struct CombOperationExecutor {
 
           /* Offset the old point position in screen space and transform it back into 3D space.
            */
-          const float2 new_position_re = old_pos_re + brush_pos_diff_re_ * weight;
-          float3 new_position_wo;
+          const float2 new_symm_pos_re = old_symm_pos_re + brush_pos_diff_re_ * weight;
+          float3 new_symm_pos_wo;
           ED_view3d_win_to_3d(ctx_.v3d,
                               ctx_.region,
-                              transforms_.curves_to_world * old_pos_cu,
-                              new_position_re,
-                              new_position_wo);
-          const float3 new_position_cu = brush_transform *
-                                         (transforms_.world_to_curves * new_position_wo);
-          positions_cu[point_i] = new_position_cu;
+                              transforms_.curves_to_world * old_symm_pos_cu,
+                              new_symm_pos_re,
+                              new_symm_pos_wo);
+          const float3 new_pos_cu = brush_transform *
+                                    (transforms_.world_to_curves * new_symm_pos_wo);
+
+          const float3 translation_eval = new_pos_cu - old_pos_cu;
+          const float3 translation_orig = deformation.translation_from_deformed_to_original(
+              point_i, translation_eval);
+          positions_cu_orig[point_i] += translation_orig;
 
           curve_changed = true;
         }
@@ -245,7 +255,7 @@ struct CombOperationExecutor {
   void comb_spherical_with_symmetry(EnumerableThreadSpecific<Vector<int>> &r_changed_curves)
   {
     float4x4 projection;
-    ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
+    ED_view3d_ob_project_mat_get(ctx_.rv3d, curves_ob_orig_, projection.values);
 
     float3 brush_start_wo, brush_end_wo;
     ED_view3d_win_to_3d(ctx_.v3d,
@@ -264,7 +274,7 @@ struct CombOperationExecutor {
     const float brush_radius_cu = self_->brush_3d_.radius_cu * brush_radius_factor_;
 
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       this->comb_spherical(r_changed_curves,
                            brush_transform * brush_start_cu,
@@ -278,17 +288,20 @@ struct CombOperationExecutor {
                       const float3 &brush_end_cu,
                       const float brush_radius_cu)
   {
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
+    MutableSpan<float3> positions_cu = curves_orig_->positions_for_write();
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
     const float3 brush_diff_cu = brush_end_cu - brush_start_cu;
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *curves_ob_orig_);
+
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
       Vector<int> &local_changed_curves = r_changed_curves.local();
       for (const int curve_i : curve_selection_.slice(range)) {
         bool curve_changed = false;
-        const IndexRange points = curves_->points_for_curve(curve_i);
+        const IndexRange points = curves_orig_->points_for_curve(curve_i);
         for (const int point_i : points.drop_front(1)) {
-          const float3 pos_old_cu = positions_cu[point_i];
+          const float3 pos_old_cu = deformation.positions[point_i];
 
           /* Compute distance to the brush. */
           const float distance_to_brush_sq_cu = dist_squared_to_line_segment_v3(
@@ -306,8 +319,12 @@ struct CombOperationExecutor {
           /* Combine the falloff and brush strength. */
           const float weight = brush_strength_ * radius_falloff * point_factors_[point_i];
 
+          const float3 translation_eval_cu = weight * brush_diff_cu;
+          const float3 translation_orig_cu = deformation.translation_from_deformed_to_original(
+              point_i, translation_eval_cu);
+
           /* Update the point position. */
-          positions_cu[point_i] = pos_old_cu + weight * brush_diff_cu;
+          positions_cu[point_i] += translation_orig_cu;
           curve_changed = true;
         }
         if (curve_changed) {
@@ -326,7 +343,7 @@ struct CombOperationExecutor {
                                                                    *ctx_.region,
                                                                    *ctx_.v3d,
                                                                    *ctx_.rv3d,
-                                                                   *object_,
+                                                                   *curves_ob_orig_,
                                                                    brush_pos_re_,
                                                                    brush_radius_base_re_);
     if (brush_3d.has_value()) {
@@ -340,11 +357,11 @@ struct CombOperationExecutor {
    */
   void initialize_segment_lengths()
   {
-    const Span<float3> positions_cu = curves_->positions();
-    self_->segment_lengths_cu_.reinitialize(curves_->points_num());
-    threading::parallel_for(curves_->curves_range(), 128, [&](const IndexRange range) {
+    const Span<float3> positions_cu = curves_orig_->positions();
+    self_->segment_lengths_cu_.reinitialize(curves_orig_->points_num());
+    threading::parallel_for(curves_orig_->curves_range(), 128, [&](const IndexRange range) {
       for (const int curve_i : range) {
-        const IndexRange points = curves_->points_for_curve(curve_i);
+        const IndexRange points = curves_orig_->points_for_curve(curve_i);
         for (const int point_i : points.drop_back(1)) {
           const float3 &p1_cu = positions_cu[point_i];
           const float3 &p2_cu = positions_cu[point_i + 1];
@@ -361,12 +378,12 @@ struct CombOperationExecutor {
   void restore_segment_lengths(EnumerableThreadSpecific<Vector<int>> &changed_curves)
   {
     const Span<float> expected_lengths_cu = self_->segment_lengths_cu_;
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
+    MutableSpan<float3> positions_cu = curves_orig_->positions_for_write();
 
     threading::parallel_for_each(changed_curves, [&](const Vector<int> &changed_curves) {
       threading::parallel_for(changed_curves.index_range(), 256, [&](const IndexRange range) {
         for (const int curve_i : changed_curves.as_span().slice(range)) {
-          const IndexRange points = curves_->points_for_curve(curve_i);
+          const IndexRange points = curves_orig_->points_for_curve(curve_i);
           for (const int segment_i : points.drop_back(1)) {
             const float3 &p1_cu = positions_cu[segment_i];
             float3 &p2_cu = positions_cu[segment_i + 1];
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_delete.cc b/source/blender/editors/sculpt_paint/curves_sculpt_delete.cc
index 777ebd16110..a44499ce133 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_delete.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_delete.cc
@@ -51,6 +51,12 @@ using blender::bke::CurvesGeometry;
 class DeleteOperation : public CurvesSculptStrokeOperation {
  private:
   CurvesBrush3D brush_3d_;
+  /**
+   * Need to store those in case the brush is evaluated more than once before the curves are
+   * evaluated again. This can happen when the mouse is moved quickly and the brush spacing is
+   * small.
+   */
+  Vector<float3> deformed_positions_;
 
   friend struct DeleteOperationExecutor;
 
@@ -109,6 +115,9 @@ struct DeleteOperationExecutor {
       if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
         this->initialize_spherical_brush_reference_point();
       }
+      const bke::crazyspace::GeometryDeformation deformation =
+          bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+      self_->deformed_positions_ = deformation.positions;
     }
 
     Array<bool> curves_to_delete(curves_->curves_num(), false);
@@ -123,12 +132,22 @@ struct DeleteOperationExecutor {
     }
 
     Vector<int64_t> indices;
-    const IndexMask mask = index_mask_ops::find_indices_based_on_predicate(
+    const IndexMask mask_to_delete = index_mask_ops::find_indices_based_on_predicate(
         curves_->curves_range(), 4096, indices, [&](const int curve_i) {
           return curves_to_delete[curve_i];
         });
 
-    curves_->remove_curves(mask);
+    /* Remove deleted curves from the stored deformed positions. */
+    const Vector<IndexRange> ranges_to_keep = mask_to_delete.extract_ranges_invert(
+        curves_->curves_range());
+    Vector<float3> new_deformed_positions;
+    for (const IndexRange curves_range : ranges_to_keep) {
+      new_deformed_positions.extend(
+          self_->deformed_positions_.as_span().slice(curves_->points_for_curves(curves_range)));
+    }
+    self_->deformed_positions_ = std::move(new_deformed_positions);
+
+    curves_->remove_curves(mask_to_delete);
 
     DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
     WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
@@ -151,8 +170,6 @@ struct DeleteOperationExecutor {
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
 
-    Span<float3> positions_cu = curves_->positions();
-
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
@@ -160,7 +177,7 @@ struct DeleteOperationExecutor {
       for (const int curve_i : curve_selection_.slice(range)) {
         const IndexRange points = curves_->points_for_curve(curve_i);
         if (points.size() == 1) {
-          const float3 pos_cu = brush_transform_inv * positions_cu[points.first()];
+          const float3 pos_cu = brush_transform_inv * self_->deformed_positions_[points.first()];
           float2 pos_re;
           ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
 
@@ -171,8 +188,8 @@ struct DeleteOperationExecutor {
         }
 
         for (const int segment_i : points.drop_back(1)) {
-          const float3 pos1_cu = brush_transform_inv * positions_cu[segment_i];
-          const float3 pos2_cu = brush_transform_inv * positions_cu[segment_i + 1];
+          const float3 pos1_cu = brush_transform_inv * self_->deformed_positions_[segment_i];
+          const float3 pos2_cu = brush_transform_inv * self_->deformed_positions_[segment_i + 1];
 
           float2 pos1_re, pos2_re;
           ED_view3d_project_float_v2_m4(ctx_.region, pos1_cu, pos1_re, projection.values);
@@ -212,8 +229,6 @@ struct DeleteOperationExecutor {
 
   void delete_spherical(const float3 &brush_cu, MutableSpan<bool> curves_to_delete)
   {
-    Span<float3> positions_cu = curves_->positions();
-
     const float brush_radius_cu = self_->brush_3d_.radius_cu * brush_radius_factor_;
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
@@ -222,7 +237,7 @@ struct DeleteOperationExecutor {
         const IndexRange points = curves_->points_for_curve(curve_i);
 
         if (points.size() == 1) {
-          const float3 &pos_cu = positions_cu[points.first()];
+          const float3 &pos_cu = self_->deformed_positions_[points.first()];
           const float distance_sq_cu = math::distance_squared(pos_cu, brush_cu);
           if (distance_sq_cu < brush_radius_sq_cu) {
             curves_to_delete[curve_i] = true;
@@ -231,8 +246,8 @@ struct DeleteOperationExecutor {
         }
 
         for (const int segment_i : points.drop_back(1)) {
-          const float3 &pos1_cu = positions_cu[segment_i];
-          const float3 &pos2_cu = positions_cu[segment_i + 1];
+          const float3 &pos1_cu = self_->deformed_positions_[segment_i];
+          const float3 &pos2_cu = self_->deformed_positions_[segment_i + 1];
 
           const float distance_sq_cu = dist_squared_to_line_segment_v3(brush_cu, pos1_cu, pos2_cu);
           if (distance_sq_cu > brush_radius_sq_cu) {
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_density.cc b/source/blender/editors/sculpt_paint/curves_sculpt_density.cc
index e211a568705..a37eb4bb560 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_density.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_density.cc
@@ -2,6 +2,7 @@
 
 #include <numeric>
 
+#include "BKE_attribute_math.hh"
 #include "BKE_brush.h"
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
@@ -9,11 +10,15 @@
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_mesh_sample.hh"
+#include "BKE_modifier.h"
+#include "BKE_object.h"
+#include "BKE_report.h"
 
 #include "ED_screen.h"
 #include "ED_view3d.h"
 
 #include "DEG_depsgraph.h"
+#include "DEG_depsgraph_query.h"
 
 #include "BLI_index_mask_ops.hh"
 #include "BLI_kdtree.h"
@@ -36,7 +41,11 @@ namespace blender::ed::sculpt_paint {
 class DensityAddOperation : public CurvesSculptStrokeOperation {
  private:
   /** Used when some data should be interpolated from existing curves. */
-  KDTree_3d *curve_roots_kdtree_ = nullptr;
+  KDTree_3d *original_curve_roots_kdtree_ = nullptr;
+  /** Contains curve roots of all curves that existed before the brush started. */
+  KDTree_3d *deformed_curve_roots_kdtree_ = nullptr;
+  /** Root positions of curves that have been added in the current brush stroke. */
+  Vector<float3> new_deformed_root_positions_;
   int original_curve_num_ = 0;
 
   friend struct DensityAddOperationExecutor;
@@ -44,8 +53,11 @@ class DensityAddOperation : public CurvesSculptStrokeOperation {
  public:
   ~DensityAddOperation() override
   {
-    if (curve_roots_kdtree_ != nullptr) {
-      BLI_kdtree_3d_free(curve_roots_kdtree_);
+    if (original_curve_roots_kdtree_ != nullptr) {
+      BLI_kdtree_3d_free(original_curve_roots_kdtree_);
+    }
+    if (deformed_curve_roots_kdtree_ != nullptr) {
+      BLI_kdtree_3d_free(deformed_curve_roots_kdtree_);
     }
   }
 
@@ -56,14 +68,18 @@ struct DensityAddOperationExecutor {
   DensityAddOperation *self_ = nullptr;
   CurvesSculptCommonContext ctx_;
 
-  Object *object_ = nullptr;
-  Curves *curves_id_ = nullptr;
-  CurvesGeometry *curves_ = nullptr;
+  Object *curves_ob_orig_ = nullptr;
+  Curves *curves_id_orig_ = nullptr;
+  CurvesGeometry *curves_orig_ = nullptr;
+
+  Object *surface_ob_orig_ = nullptr;
+  Mesh *surface_orig_ = nullptr;
 
-  Object *surface_ob_ = nullptr;
-  Mesh *surface_ = nullptr;
-  Span<MLoopTri> surface_looptris_;
-  Span<float3> corner_normals_su_;
+  Object *surface_ob_eval_ = nullptr;
+  Mesh *surface_eval_ = nullptr;
+  Span<MLoopTri> surface_looptris_eval_;
+  VArraySpan<float2> surface_uv_map_eval_;
+  BVHTreeFromMesh surface_bvh_eval_;
 
   const CurvesSculpt *curves_sculpt_ = nullptr;
   const Brush *brush_ = nullptr;
@@ -75,8 +91,6 @@ struct DensityAddOperationExecutor {
 
   CurvesSurfaceTransforms transforms_;
 
-  BVHTreeFromMesh surface_bvh_;
-
   DensityAddOperationExecutor(const bContext &C) : ctx_(C)
   {
   }
@@ -86,32 +100,58 @@ struct DensityAddOperationExecutor {
                const StrokeExtension &stroke_extension)
   {
     self_ = &self;
-    object_ = CTX_data_active_object(&C);
-    curves_id_ = static_cast<Curves *>(object_->data);
-    curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
+    curves_ob_orig_ = CTX_data_active_object(&C);
+    curves_id_orig_ = static_cast<Curves *>(curves_ob_orig_->data);
+    curves_orig_ = &CurvesGeometry::wrap(curves_id_orig_->geometry);
 
     if (stroke_extension.is_first) {
-      self_->original_curve_num_ = curves_->curves_num();
+      self_->original_curve_num_ = curves_orig_->curves_num();
     }
 
-    if (curves_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
+    if (curves_id_orig_->surface == nullptr || curves_id_orig_->surface->type != OB_MESH) {
+      report_missing_surface(stroke_extension.reports);
       return;
     }
 
-    surface_ob_ = curves_id_->surface;
-    surface_ = static_cast<Mesh *>(surface_ob_->data);
-
-    surface_looptris_ = {BKE_mesh_runtime_looptri_ensure(surface_),
-                         BKE_mesh_runtime_looptri_len(surface_)};
+    surface_ob_orig_ = curves_id_orig_->surface;
+    surface_orig_ = static_cast<Mesh *>(surface_ob_orig_->data);
+    if (surface_orig_->totpoly == 0) {
+      report_empty_original_surface(stroke_extension.reports);
+      return;
+    }
 
-    transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
+    surface_ob_eval_ = DEG_get_evaluated_object(ctx_.depsgraph, surface_ob_orig_);
+    if (surface_ob_eval_ == nullptr) {
+      return;
+    }
+    surface_eval_ = BKE_object_get_evaluated_mesh(surface_ob_eval_);
+    if (surface_eval_->totpoly == 0) {
+      report_empty_evaluated_surface(stroke_extension.reports);
+      return;
+    }
 
-    if (!CustomData_has_layer(&surface_->ldata, CD_NORMAL)) {
-      BKE_mesh_calc_normals_split(surface_);
+    BKE_bvhtree_from_mesh_get(&surface_bvh_eval_, surface_eval_, BVHTREE_FROM_LOOPTRI, 2);
+    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval_); });
+    surface_looptris_eval_ = {BKE_mesh_runtime_looptri_ensure(surface_eval_),
+                              BKE_mesh_runtime_looptri_len(surface_eval_)};
+    /* Find UV map. */
+    VArraySpan<float2> surface_uv_map;
+    if (curves_id_orig_->surface_uv_map != nullptr) {
+      surface_uv_map = surface_orig_->attributes().lookup<float2>(curves_id_orig_->surface_uv_map,
+                                                                  ATTR_DOMAIN_CORNER);
+      surface_uv_map_eval_ = surface_eval_->attributes().lookup<float2>(
+          curves_id_orig_->surface_uv_map, ATTR_DOMAIN_CORNER);
+    }
+    if (surface_uv_map.is_empty()) {
+      report_missing_uv_map_on_original_surface(stroke_extension.reports);
+      return;
+    }
+    if (surface_uv_map_eval_.is_empty()) {
+      report_missing_uv_map_on_evaluated_surface(stroke_extension.reports);
+      return;
     }
-    corner_normals_su_ = {
-        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_->ldata, CD_NORMAL)),
-        surface_->totloop};
+
+    transforms_ = CurvesSurfaceTransforms(*curves_ob_orig_, curves_id_orig_->surface);
 
     curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
     brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
@@ -123,23 +163,17 @@ struct DensityAddOperationExecutor {
     const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
         brush_->falloff_shape);
 
-    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
-    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
-
-    Vector<float3> new_bary_coords;
-    Vector<int> new_looptri_indices;
     Vector<float3> new_positions_cu;
+    Vector<float2> new_uvs;
     const double time = PIL_check_seconds_timer() * 1000000.0;
     RandomNumberGenerator rng{*(uint32_t *)(&time)};
 
     /* Find potential new curve root points. */
     if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
-      this->sample_projected_with_symmetry(
-          rng, new_bary_coords, new_looptri_indices, new_positions_cu);
+      this->sample_projected_with_symmetry(rng, new_uvs, new_positions_cu);
     }
     else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
-      this->sample_spherical_with_symmetry(
-          rng, new_bary_coords, new_looptri_indices, new_positions_cu);
+      this->sample_spherical_with_symmetry(rng, new_uvs, new_positions_cu);
     }
     else {
       BLI_assert_unreachable();
@@ -148,9 +182,11 @@ struct DensityAddOperationExecutor {
       pos = transforms_.surface_to_curves * pos;
     }
 
-    this->ensure_curve_roots_kdtree();
+    if (stroke_extension.is_first) {
+      this->prepare_curve_roots_kdtrees();
+    }
 
-    const int already_added_curves = curves_->curves_num() - self_->original_curve_num_;
+    const int already_added_curves = self_->new_deformed_root_positions_.size();
     KDTree_3d *new_roots_kdtree = BLI_kdtree_3d_new(already_added_curves +
                                                     new_positions_cu.size());
     BLI_SCOPED_DEFER([&]() { BLI_kdtree_3d_free(new_roots_kdtree); });
@@ -159,17 +195,15 @@ struct DensityAddOperationExecutor {
      * curves. */
     Array<bool> new_curve_skipped(new_positions_cu.size(), false);
     threading::parallel_invoke(
+        512 < already_added_curves + new_positions_cu.size(),
         /* Build kdtree from root points created by the current stroke. */
         [&]() {
-          const Span<float3> positions_cu = curves_->positions();
-          for (const int curve_i : curves_->curves_range().take_back(already_added_curves)) {
-            const float3 &root_pos_cu = positions_cu[curves_->offsets()[curve_i]];
-            BLI_kdtree_3d_insert(new_roots_kdtree, curve_i, root_pos_cu);
+          for (const int i : IndexRange(already_added_curves)) {
+            BLI_kdtree_3d_insert(new_roots_kdtree, -1, self_->new_deformed_root_positions_[i]);
           }
           for (const int new_i : new_positions_cu.index_range()) {
-            const int index_in_kdtree = curves_->curves_num() + new_i;
             const float3 &root_pos_cu = new_positions_cu[new_i];
-            BLI_kdtree_3d_insert(new_roots_kdtree, index_in_kdtree, root_pos_cu);
+            BLI_kdtree_3d_insert(new_roots_kdtree, new_i, root_pos_cu);
           }
           BLI_kdtree_3d_balance(new_roots_kdtree);
         },
@@ -183,7 +217,7 @@ struct DensityAddOperationExecutor {
                   KDTreeNearest_3d nearest;
                   nearest.dist = FLT_MAX;
                   BLI_kdtree_3d_find_nearest(
-                      self_->curve_roots_kdtree_, new_root_pos_cu, &nearest);
+                      self_->deformed_curve_roots_kdtree_, new_root_pos_cu, &nearest);
                   if (nearest.dist < brush_settings_->minimum_distance) {
                     new_curve_skipped[new_i] = true;
                   }
@@ -201,12 +235,11 @@ struct DensityAddOperationExecutor {
           new_roots_kdtree,
           root_pos_cu,
           brush_settings_->minimum_distance,
-          [&](const int other_i, const float *UNUSED(co), float UNUSED(dist_sq)) {
-            if (other_i < curves_->curves_num()) {
+          [&](const int other_new_i, const float *UNUSED(co), float UNUSED(dist_sq)) {
+            if (other_new_i == -1) {
               new_curve_skipped[new_i] = true;
               return false;
             }
-            const int other_new_i = other_i - curves_->curves_num();
             if (new_i == other_new_i) {
               return true;
             }
@@ -219,31 +252,25 @@ struct DensityAddOperationExecutor {
     for (int64_t i = new_positions_cu.size() - 1; i >= 0; i--) {
       if (new_curve_skipped[i]) {
         new_positions_cu.remove_and_reorder(i);
-        new_bary_coords.remove_and_reorder(i);
-        new_looptri_indices.remove_and_reorder(i);
+        new_uvs.remove_and_reorder(i);
       }
     }
-
-    /* Find UV map. */
-    VArraySpan<float2> surface_uv_map;
-    if (curves_id_->surface_uv_map != nullptr) {
-      bke::AttributeAccessor surface_attributes = bke::mesh_attributes(*surface_);
-      surface_uv_map = surface_attributes.lookup<float2>(curves_id_->surface_uv_map,
-                                                         ATTR_DOMAIN_CORNER);
-    }
+    self_->new_deformed_root_positions_.extend(new_positions_cu);
 
     /* Find normals. */
-    if (!CustomData_has_layer(&surface_->ldata, CD_NORMAL)) {
-      BKE_mesh_calc_normals_split(surface_);
+    if (!CustomData_has_layer(&surface_orig_->ldata, CD_NORMAL)) {
+      BKE_mesh_calc_normals_split(surface_orig_);
     }
     const Span<float3> corner_normals_su = {
-        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_->ldata, CD_NORMAL)),
-        surface_->totloop};
+        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_orig_->ldata, CD_NORMAL)),
+        surface_orig_->totloop};
+
+    const Span<MLoopTri> surface_looptris_orig = {BKE_mesh_runtime_looptri_ensure(surface_orig_),
+                                                  BKE_mesh_runtime_looptri_len(surface_orig_)};
+    const geometry::ReverseUVSampler reverse_uv_sampler{surface_uv_map, surface_looptris_orig};
 
     geometry::AddCurvesOnMeshInputs add_inputs;
-    add_inputs.root_positions_cu = new_positions_cu;
-    add_inputs.bary_coords = new_bary_coords;
-    add_inputs.looptri_indices = new_looptri_indices;
+    add_inputs.uvs = new_uvs;
     add_inputs.interpolate_length = brush_settings_->flag &
                                     BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_LENGTH;
     add_inputs.interpolate_shape = brush_settings_->flag &
@@ -252,53 +279,73 @@ struct DensityAddOperationExecutor {
                                          BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_POINT_COUNT;
     add_inputs.fallback_curve_length = brush_settings_->curve_length;
     add_inputs.fallback_point_count = std::max(2, brush_settings_->points_per_curve);
-    add_inputs.surface = surface_;
-    add_inputs.surface_bvh = &surface_bvh_;
-    add_inputs.surface_looptris = surface_looptris_;
-    add_inputs.surface_uv_map = surface_uv_map;
+    add_inputs.transforms = &transforms_;
+    add_inputs.surface = surface_orig_;
     add_inputs.corner_normals_su = corner_normals_su;
-    add_inputs.curves_to_surface_mat = transforms_.curves_to_surface;
-    add_inputs.surface_to_curves_normal_mat = transforms_.surface_to_curves_normal;
-    add_inputs.old_roots_kdtree = self_->curve_roots_kdtree_;
+    add_inputs.reverse_uv_sampler = &reverse_uv_sampler;
+    add_inputs.old_roots_kdtree = self_->original_curve_roots_kdtree_;
 
-    geometry::add_curves_on_mesh(*curves_, add_inputs);
+    const geometry::AddCurvesOnMeshOutputs add_outputs = geometry::add_curves_on_mesh(
+        *curves_orig_, add_inputs);
 
-    DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
-    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
+    if (add_outputs.uv_error) {
+      report_invalid_uv_map(stroke_extension.reports);
+    }
+
+    DEG_id_tag_update(&curves_id_orig_->id, ID_RECALC_GEOMETRY);
+    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_orig_->id);
     ED_region_tag_redraw(ctx_.region);
   }
 
-  void ensure_curve_roots_kdtree()
+  void prepare_curve_roots_kdtrees()
   {
-    if (self_->curve_roots_kdtree_ == nullptr) {
-      self_->curve_roots_kdtree_ = BLI_kdtree_3d_new(curves_->curves_num());
-      for (const int curve_i : curves_->curves_range()) {
-        const int root_point_i = curves_->offsets()[curve_i];
-        const float3 &root_pos_cu = curves_->positions()[root_point_i];
-        BLI_kdtree_3d_insert(self_->curve_roots_kdtree_, curve_i, root_pos_cu);
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *curves_ob_orig_);
+    const Span<int> curve_offsets = curves_orig_->offsets();
+    const Span<float3> original_positions = curves_orig_->positions();
+    const Span<float3> deformed_positions = deformation.positions;
+    BLI_assert(original_positions.size() == deformed_positions.size());
+
+    auto roots_kdtree_from_positions = [&](const Span<float3> positions) {
+      KDTree_3d *kdtree = BLI_kdtree_3d_new(curves_orig_->curves_num());
+      for (const int curve_i : curves_orig_->curves_range()) {
+        const int root_point_i = curve_offsets[curve_i];
+        BLI_kdtree_3d_insert(kdtree, curve_i, positions[root_point_i]);
       }
-      BLI_kdtree_3d_balance(self_->curve_roots_kdtree_);
-    }
+      BLI_kdtree_3d_balance(kdtree);
+      return kdtree;
+    };
+
+    threading::parallel_invoke(
+        1024 < original_positions.size() + deformed_positions.size(),
+        [&]() {
+          self_->original_curve_roots_kdtree_ = roots_kdtree_from_positions(original_positions);
+        },
+        [&]() {
+          self_->deformed_curve_roots_kdtree_ = roots_kdtree_from_positions(deformed_positions);
+        });
   }
 
   void sample_projected_with_symmetry(RandomNumberGenerator &rng,
-                                      Vector<float3> &r_bary_coords,
-                                      Vector<int> &r_looptri_indices,
+                                      Vector<float2> &r_uvs,
                                       Vector<float3> &r_positions_su)
   {
     float4x4 projection;
-    ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
+    ED_view3d_ob_project_mat_get(ctx_.rv3d, curves_ob_orig_, projection.values);
 
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       const float4x4 brush_transform_inv = brush_transform.inverted();
       const float4x4 transform = transforms_.curves_to_surface * brush_transform *
                                  transforms_.world_to_curves;
+      Vector<float3> positions_su;
+      Vector<float3> bary_coords;
+      Vector<int> looptri_indices;
       const int new_points = bke::mesh_surface_sample::sample_surface_points_projected(
           rng,
-          *surface_,
-          surface_bvh_,
+          *surface_eval_,
+          surface_bvh_eval_,
           brush_pos_re_,
           brush_radius_re_,
           [&](const float2 &pos_re, float3 &r_start_su, float3 &r_end_su) {
@@ -311,14 +358,13 @@ struct DensityAddOperationExecutor {
           true,
           brush_settings_->density_add_attempts,
           brush_settings_->density_add_attempts,
-          r_bary_coords,
-          r_looptri_indices,
-          r_positions_su);
+          bary_coords,
+          looptri_indices,
+          positions_su);
 
       /* Remove some sampled points randomly based on the brush falloff and strength. */
-      const int old_points = r_bary_coords.size() - new_points;
-      for (int i = r_bary_coords.size() - 1; i >= old_points; i--) {
-        const float3 pos_su = r_positions_su[i];
+      for (int i = new_points - 1; i >= 0; i--) {
+        const float3 pos_su = positions_su[i];
         const float3 pos_cu = brush_transform_inv * transforms_.surface_to_curves * pos_su;
         float2 pos_re;
         ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
@@ -327,24 +373,30 @@ struct DensityAddOperationExecutor {
             brush_, dist_to_brush_re, brush_radius_re_);
         const float weight = brush_strength_ * radius_falloff;
         if (rng.get_float() > weight) {
-          r_bary_coords.remove_and_reorder(i);
-          r_looptri_indices.remove_and_reorder(i);
-          r_positions_su.remove_and_reorder(i);
+          bary_coords.remove_and_reorder(i);
+          looptri_indices.remove_and_reorder(i);
+          positions_su.remove_and_reorder(i);
         }
       }
+
+      for (const int i : bary_coords.index_range()) {
+        const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
+            bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
+        r_uvs.append(uv);
+      }
+      r_positions_su.extend(positions_su);
     }
   }
 
   void sample_spherical_with_symmetry(RandomNumberGenerator &rng,
-                                      Vector<float3> &r_bary_coords,
-                                      Vector<int> &r_looptri_indices,
+                                      Vector<float2> &r_uvs,
                                       Vector<float3> &r_positions_su)
   {
     const std::optional<CurvesBrush3D> brush_3d = sample_curves_surface_3d_brush(*ctx_.depsgraph,
                                                                                  *ctx_.region,
                                                                                  *ctx_.v3d,
                                                                                  transforms_,
-                                                                                 surface_bvh_,
+                                                                                 surface_bvh_eval_,
                                                                                  brush_pos_re_,
                                                                                  brush_radius_re_);
     if (!brush_3d.has_value()) {
@@ -352,7 +404,7 @@ struct DensityAddOperationExecutor {
     }
 
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
-        eCurvesSymmetryType(curves_id_->symmetry));
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       const float3 brush_pos_cu = brush_transform * brush_3d->position_cu;
       const float3 brush_pos_su = transforms_.curves_to_surface * brush_pos_cu;
@@ -360,45 +412,54 @@ struct DensityAddOperationExecutor {
           transforms_.curves_to_surface, brush_pos_cu, brush_3d->radius_cu);
       const float brush_radius_sq_su = pow2f(brush_radius_su);
 
-      Vector<int> looptri_indices;
+      Vector<int> selected_looptri_indices;
       BLI_bvhtree_range_query_cpp(
-          *surface_bvh_.tree,
+          *surface_bvh_eval_.tree,
           brush_pos_su,
           brush_radius_su,
           [&](const int index, const float3 &UNUSED(co), const float UNUSED(dist_sq)) {
-            looptri_indices.append(index);
+            selected_looptri_indices.append(index);
           });
 
       const float brush_plane_area_su = M_PI * brush_radius_sq_su;
       const float approximate_density_su = brush_settings_->density_add_attempts /
                                            brush_plane_area_su;
 
+      Vector<float3> positions_su;
+      Vector<float3> bary_coords;
+      Vector<int> looptri_indices;
       const int new_points = bke::mesh_surface_sample::sample_surface_points_spherical(
           rng,
-          *surface_,
-          looptri_indices,
+          *surface_eval_,
+          selected_looptri_indices,
           brush_pos_su,
           brush_radius_su,
           approximate_density_su,
-          r_bary_coords,
-          r_looptri_indices,
-          r_positions_su);
+          bary_coords,
+          looptri_indices,
+          positions_su);
 
       /* Remove some sampled points randomly based on the brush falloff and strength. */
-      const int old_points = r_bary_coords.size() - new_points;
-      for (int i = r_bary_coords.size() - 1; i >= old_points; i--) {
-        const float3 pos_su = r_positions_su[i];
+      for (int i = new_points - 1; i >= 0; i--) {
+        const float3 pos_su = positions_su[i];
         const float3 pos_cu = transforms_.surface_to_curves * pos_su;
         const float dist_to_brush_cu = math::distance(pos_cu, brush_pos_cu);
         const float radius_falloff = BKE_brush_curve_strength(
             brush_, dist_to_brush_cu, brush_3d->radius_cu);
         const float weight = brush_strength_ * radius_falloff;
         if (rng.get_float() > weight) {
-          r_bary_coords.remove_and_reorder(i);
-          r_looptri_indices.remove_and_reorder(i);
-          r_positions_su.remove_and_reorder(i);
+          bary_coords.remove_and_reorder(i);
+          looptri_indices.remove_and_reorder(i);
+          positions_su.remove_and_reorder(i);
         }
       }
+
+      for (const int i : bary_coords.index_range()) {
+        const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
+            bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
+        r_uvs.append(uv);
+      }
+      r_positions_su.extend(positions_su);
     }
   }
 };
@@ -414,6 +475,13 @@ class DensitySubtractOperation : public CurvesSculptStrokeOperation {
  private:
   friend struct DensitySubtractOperationExecutor;
 
+  /**
+   * Deformed root positions of curves that still exist. This has to be stored in case the brush is
+   * executed more than once before the curves are evaluated again. This can happen when the mouse
+   * is moved quickly and the brush spacing is small.
+   */
+  Vector<float3> deformed_root_positions_;
+
  public:
   void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
 };
@@ -433,8 +501,12 @@ struct DensitySubtractOperationExecutor {
   Vector<int64_t> selected_curve_indices_;
   IndexMask curve_selection_;
 
-  Object *surface_ob_ = nullptr;
-  Mesh *surface_ = nullptr;
+  Object *surface_ob_orig_ = nullptr;
+  Mesh *surface_orig_ = nullptr;
+
+  Object *surface_ob_eval_ = nullptr;
+  Mesh *surface_eval_ = nullptr;
+  BVHTreeFromMesh surface_bvh_eval_;
 
   const CurvesSculpt *curves_sculpt_ = nullptr;
   const Brush *brush_ = nullptr;
@@ -446,7 +518,6 @@ struct DensitySubtractOperationExecutor {
   float minimum_distance_;
 
   CurvesSurfaceTransforms transforms_;
-  BVHTreeFromMesh surface_bvh_;
 
   KDTree_3d *root_points_kdtree_;
 
@@ -468,11 +539,20 @@ struct DensitySubtractOperationExecutor {
       return;
     }
 
-    surface_ob_ = curves_id_->surface;
-    if (surface_ob_ == nullptr) {
+    surface_ob_orig_ = curves_id_->surface;
+    if (surface_ob_orig_ == nullptr) {
+      return;
+    }
+    surface_orig_ = static_cast<Mesh *>(surface_ob_orig_->data);
+
+    surface_ob_eval_ = DEG_get_evaluated_object(ctx_.depsgraph, surface_ob_orig_);
+    if (surface_ob_eval_ == nullptr) {
       return;
     }
-    surface_ = static_cast<Mesh *>(surface_ob_->data);
+    surface_eval_ = BKE_object_get_evaluated_mesh(surface_ob_eval_);
+
+    BKE_bvhtree_from_mesh_get(&surface_bvh_eval_, surface_eval_, BVHTREE_FROM_LOOPTRI, 2);
+    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval_); });
 
     curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
     brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
@@ -488,16 +568,20 @@ struct DensitySubtractOperationExecutor {
     transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
     const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
         brush_->falloff_shape);
-    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
-    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
 
-    const Span<float3> positions_cu = curves_->positions();
+    if (stroke_extension.is_first) {
+      const bke::crazyspace::GeometryDeformation deformation =
+          bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+      for (const int curve_i : curves_->curves_range()) {
+        const int first_point_i = curves_->offsets()[curve_i];
+        self_->deformed_root_positions_.append(deformation.positions[first_point_i]);
+      }
+    }
 
     root_points_kdtree_ = BLI_kdtree_3d_new(curve_selection_.size());
     BLI_SCOPED_DEFER([&]() { BLI_kdtree_3d_free(root_points_kdtree_); });
     for (const int curve_i : curve_selection_) {
-      const int first_point_i = curves_->offsets()[curve_i];
-      const float3 &pos_cu = positions_cu[first_point_i];
+      const float3 &pos_cu = self_->deformed_root_positions_[curve_i];
       BLI_kdtree_3d_insert(root_points_kdtree_, curve_i, pos_cu);
     }
     BLI_kdtree_3d_balance(root_points_kdtree_);
@@ -515,12 +599,23 @@ struct DensitySubtractOperationExecutor {
     }
 
     Vector<int64_t> indices;
-    const IndexMask mask = index_mask_ops::find_indices_based_on_predicate(
+    const IndexMask mask_to_delete = index_mask_ops::find_indices_based_on_predicate(
         curves_->curves_range(), 4096, indices, [&](const int curve_i) {
           return curves_to_delete[curve_i];
         });
 
-    curves_->remove_curves(mask);
+    /* Remove deleted curves from the stored deformed root positions. */
+    const Vector<IndexRange> ranges_to_keep = mask_to_delete.extract_ranges_invert(
+        curves_->curves_range());
+    BLI_assert(curves_->curves_num() == self_->deformed_root_positions_.size());
+    Vector<float3> new_deformed_positions;
+    for (const IndexRange range : ranges_to_keep) {
+      new_deformed_positions.extend(self_->deformed_root_positions_.as_span().slice(range));
+    }
+    self_->deformed_root_positions_ = std::move(new_deformed_positions);
+
+    curves_->remove_curves(mask_to_delete);
+    BLI_assert(curves_->curves_num() == self_->deformed_root_positions_.size());
 
     DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
     WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
@@ -539,15 +634,12 @@ struct DensitySubtractOperationExecutor {
   void reduce_density_projected(const float4x4 &brush_transform,
                                 MutableSpan<bool> curves_to_delete)
   {
-    const Span<float3> positions_cu = curves_->positions();
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
 
-    const Span<int> offsets = curves_->offsets();
-
     /* Randomly select the curves that are allowed to be removed, based on the brush radius and
      * strength. */
     Array<bool> allow_remove_curve(curves_->curves_num(), false);
@@ -559,8 +651,7 @@ struct DensitySubtractOperationExecutor {
           allow_remove_curve[curve_i] = true;
           continue;
         }
-        const int first_point_i = offsets[curve_i];
-        const float3 pos_cu = brush_transform * positions_cu[first_point_i];
+        const float3 pos_cu = brush_transform * self_->deformed_root_positions_[curve_i];
 
         float2 pos_re;
         ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
@@ -586,8 +677,7 @@ struct DensitySubtractOperationExecutor {
       if (!allow_remove_curve[curve_i]) {
         continue;
       }
-      const int first_point_i = offsets[curve_i];
-      const float3 orig_pos_cu = positions_cu[first_point_i];
+      const float3 orig_pos_cu = self_->deformed_root_positions_[curve_i];
       const float3 pos_cu = brush_transform * orig_pos_cu;
       float2 pos_re;
       ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
@@ -618,7 +708,7 @@ struct DensitySubtractOperationExecutor {
                                                                                  *ctx_.region,
                                                                                  *ctx_.v3d,
                                                                                  transforms_,
-                                                                                 surface_bvh_,
+                                                                                 surface_bvh_eval_,
                                                                                  brush_pos_re_,
                                                                                  brush_radius_re);
     if (!brush_3d.has_value()) {
@@ -638,8 +728,6 @@ struct DensitySubtractOperationExecutor {
                                 MutableSpan<bool> curves_to_delete)
   {
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
-    const Span<float3> positions_cu = curves_->positions();
-    const Span<int> offsets = curves_->offsets();
 
     /* Randomly select the curves that are allowed to be removed, based on the brush radius and
      * strength. */
@@ -652,8 +740,7 @@ struct DensitySubtractOperationExecutor {
           allow_remove_curve[curve_i] = true;
           continue;
         }
-        const int first_point_i = offsets[curve_i];
-        const float3 pos_cu = positions_cu[first_point_i];
+        const float3 pos_cu = self_->deformed_root_positions_[curve_i];
 
         const float dist_to_brush_sq_cu = math::distance_squared(brush_pos_cu, pos_cu);
         if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
@@ -677,8 +764,7 @@ struct DensitySubtractOperationExecutor {
       if (!allow_remove_curve[curve_i]) {
         continue;
       }
-      const int first_point_i = offsets[curve_i];
-      const float3 &pos_cu = positions_cu[first_point_i];
+      const float3 &pos_cu = self_->deformed_root_positions_[curve_i];
       const float dist_to_brush_sq_cu = math::distance_squared(pos_cu, brush_pos_cu);
       if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
         continue;
@@ -717,6 +803,10 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
 {
   const Scene &scene = *CTX_data_scene(&C);
   const Brush &brush = *BKE_paint_brush_for_read(&scene.toolsettings->curves_sculpt->paint);
+  const Depsgraph &depsgraph = *CTX_data_depsgraph_on_load(&C);
+  const ARegion &region = *CTX_wm_region(&C);
+  const View3D &v3d = *CTX_wm_view3d(&C);
+
   const eBrushCurvesSculptDensityMode density_mode = static_cast<eBrushCurvesSculptDensityMode>(
       brush.curves_sculpt_settings->density_mode);
   const bool use_invert = brush_mode == BRUSH_STROKE_INVERT;
@@ -728,26 +818,29 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
     return use_invert;
   }
 
-  const Object &curves_ob = *CTX_data_active_object(&C);
-  const Curves &curves_id = *static_cast<Curves *>(curves_ob.data);
-  const CurvesGeometry &curves = CurvesGeometry::wrap(curves_id.geometry);
-  if (curves_id.surface == nullptr) {
-    /* The brush won't do anything in this case anyway. */
+  const Object &curves_ob_orig = *CTX_data_active_object(&C);
+  const Curves &curves_id_orig = *static_cast<Curves *>(curves_ob_orig.data);
+  Object *surface_ob_orig = curves_id_orig.surface;
+  if (surface_ob_orig == nullptr) {
+    return true;
+  }
+  Object *surface_ob_eval = DEG_get_evaluated_object(&depsgraph, surface_ob_orig);
+  if (surface_ob_eval == nullptr) {
     return true;
   }
+  const CurvesGeometry &curves = CurvesGeometry::wrap(curves_id_orig.geometry);
   if (curves.curves_num() <= 1) {
     return true;
   }
+  const Mesh *surface_mesh_eval = BKE_object_get_evaluated_mesh(surface_ob_eval);
+  if (surface_mesh_eval == nullptr) {
+    return true;
+  }
 
-  const CurvesSurfaceTransforms transforms(curves_ob, curves_id.surface);
-  BVHTreeFromMesh surface_bvh;
-  BKE_bvhtree_from_mesh_get(
-      &surface_bvh, static_cast<const Mesh *>(curves_id.surface->data), BVHTREE_FROM_LOOPTRI, 2);
-  BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh); });
-
-  const Depsgraph &depsgraph = *CTX_data_depsgraph_pointer(&C);
-  const ARegion &region = *CTX_wm_region(&C);
-  const View3D &v3d = *CTX_wm_view3d(&C);
+  const CurvesSurfaceTransforms transforms(curves_ob_orig, curves_id_orig.surface);
+  BVHTreeFromMesh surface_bvh_eval;
+  BKE_bvhtree_from_mesh_get(&surface_bvh_eval, surface_mesh_eval, BVHTREE_FROM_LOOPTRI, 2);
+  BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval); });
 
   const float2 brush_pos_re = stroke_start.mouse_position;
   /* Reduce radius so that only an inner circle is used to determine the existing density. */
@@ -755,7 +848,7 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
 
   /* Find the surface point under the brush. */
   const std::optional<CurvesBrush3D> brush_3d = sample_curves_surface_3d_brush(
-      depsgraph, region, v3d, transforms, surface_bvh, brush_pos_re, brush_radius_re);
+      depsgraph, region, v3d, transforms, surface_bvh_eval, brush_pos_re, brush_radius_re);
   if (!brush_3d.has_value()) {
     return true;
   }
@@ -764,8 +857,9 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
   const float brush_radius_cu = brush_3d->radius_cu;
   const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
+  const bke::crazyspace::GeometryDeformation deformation =
+      bke::crazyspace::get_evaluated_curves_deformation(depsgraph, curves_ob_orig);
   const Span<int> offsets = curves.offsets();
-  const Span<float3> positions_cu = curves.positions();
 
   /* Compute distance from brush to curve roots. */
   Array<std::pair<float, int>> distances_sq_to_brush(curves.curves_num());
@@ -774,7 +868,7 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
     int &valid_curve_count = valid_curve_count_by_thread.local();
     for (const int curve_i : range) {
       const int root_point_i = offsets[curve_i];
-      const float3 &root_pos_cu = positions_cu[root_point_i];
+      const float3 &root_pos_cu = deformation.positions[root_point_i];
       const float dist_sq_cu = math::distance_squared(root_pos_cu, brush_pos_cu);
       if (dist_sq_cu < brush_radius_sq_cu) {
         distances_sq_to_brush[curve_i] = {math::distance_squared(root_pos_cu, brush_pos_cu),
@@ -799,9 +893,9 @@ static bool use_add_density_mode(const BrushStrokeMode brush_mode,
    * center. */
   float min_dist_sq_cu = FLT_MAX;
   for (const int i : IndexRange(check_curve_count)) {
-    const float3 &pos_i = positions_cu[offsets[distances_sq_to_brush[i].second]];
+    const float3 &pos_i = deformation.positions[offsets[distances_sq_to_brush[i].second]];
     for (int j = i + 1; j < check_curve_count; j++) {
-      const float3 &pos_j = positions_cu[offsets[distances_sq_to_brush[j].second]];
+      const float3 &pos_j = deformation.positions[offsets[distances_sq_to_brush[j].second]];
       const float dist_sq_cu = math::distance_squared(pos_i, pos_j);
       math::min_inplace(min_dist_sq_cu, dist_sq_cu);
     }
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_grow_shrink.cc b/source/blender/editors/sculpt_paint/curves_sculpt_grow_shrink.cc
index 709ecc79967..bc354ed66f4 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_grow_shrink.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_grow_shrink.cc
@@ -4,8 +4,7 @@
 
 #include "BLI_enumerable_thread_specific.hh"
 #include "BLI_float4x4.hh"
-#include "BLI_kdtree.h"
-#include "BLI_rand.hh"
+#include "BLI_length_parameterize.hh"
 #include "BLI_vector.hh"
 
 #include "PIL_time.h"
@@ -14,19 +13,13 @@
 
 #include "BKE_attribute_math.hh"
 #include "BKE_brush.h"
-#include "BKE_bvhutils.h"
 #include "BKE_context.h"
 #include "BKE_curves.hh"
-#include "BKE_mesh.h"
-#include "BKE_mesh_runtime.h"
 #include "BKE_paint.h"
-#include "BKE_spline.hh"
 
 #include "DNA_brush_enums.h"
 #include "DNA_brush_types.h"
 #include "DNA_curves_types.h"
-#include "DNA_mesh_types.h"
-#include "DNA_meshdata_types.h"
 #include "DNA_object_types.h"
 #include "DNA_screen_types.h"
 #include "DNA_space_types.h"
@@ -70,6 +63,24 @@ class ShrinkCurvesEffect : public CurvesEffect {
  private:
   const Brush &brush_;
 
+  /** Storage of per-curve parameterization data to avoid reallocation. */
+  struct ParameterizationBuffers {
+    Array<float3> old_positions;
+    Array<float> old_lengths;
+    Array<float> sample_lengths;
+    Array<int> indices;
+    Array<float> factors;
+
+    void reinitialize(const int points_num)
+    {
+      this->old_positions.reinitialize(points_num);
+      this->old_lengths.reinitialize(length_parameterize::segments_num(points_num, false));
+      this->sample_lengths.reinitialize(points_num);
+      this->indices.reinitialize(points_num);
+      this->factors.reinitialize(points_num);
+    }
+  };
+
  public:
   ShrinkCurvesEffect(const Brush &brush) : brush_(brush)
   {
@@ -81,46 +92,42 @@ class ShrinkCurvesEffect : public CurvesEffect {
   {
     MutableSpan<float3> positions_cu = curves.positions_for_write();
     threading::parallel_for(curve_indices.index_range(), 256, [&](const IndexRange range) {
+      ParameterizationBuffers data;
       for (const int influence_i : range) {
         const int curve_i = curve_indices[influence_i];
         const float move_distance_cu = move_distances_cu[influence_i];
-        const IndexRange curve_points = curves.points_for_curve(curve_i);
-        this->shrink_curve(positions_cu, curve_points, move_distance_cu);
+        const IndexRange points = curves.points_for_curve(curve_i);
+        this->shrink_curve(positions_cu.slice(points), move_distance_cu, data);
       }
     });
   }
 
+ private:
   void shrink_curve(MutableSpan<float3> positions,
-                    const IndexRange curve_points,
-                    const float shrink_length) const
+                    const float shrink_length,
+                    ParameterizationBuffers &data) const
   {
-    PolySpline spline;
-    spline.resize(curve_points.size());
-    MutableSpan<float3> spline_positions = spline.positions();
-    spline_positions.copy_from(positions.slice(curve_points));
-    spline.mark_cache_invalid();
+    namespace lp = length_parameterize;
+    data.reinitialize(positions.size());
+
+    /* Copy the old positions to facilitate mixing from neighbors for the resulting curve. */
+    data.old_positions.as_mutable_span().copy_from(positions);
+
+    lp::accumulate_lengths<float3>(data.old_positions, false, data.old_lengths);
+
     const float min_length = brush_.curves_sculpt_settings->minimum_length;
-    const float old_length = spline.length();
+    const float old_length = data.old_lengths.last();
     const float new_length = std::max(min_length, old_length - shrink_length);
     const float length_factor = std::clamp(new_length / old_length, 0.0f, 1.0f);
 
-    Vector<float> old_point_lengths;
-    old_point_lengths.append(0.0f);
-    for (const int i : spline_positions.index_range().drop_back(1)) {
-      const float3 &p1 = spline_positions[i];
-      const float3 &p2 = spline_positions[i + 1];
-      const float length = math::distance(p1, p2);
-      old_point_lengths.append(old_point_lengths.last() + length);
+    data.sample_lengths.first() = 0.0f;
+    for (const int i : data.old_lengths.index_range()) {
+      data.sample_lengths[i + 1] = data.old_lengths[i] * length_factor;
     }
 
-    for (const int i : spline_positions.index_range()) {
-      const float eval_length = old_point_lengths[i] * length_factor;
-      const Spline::LookupResult lookup = spline.lookup_evaluated_length(eval_length);
-      const float index_factor = lookup.evaluated_index + lookup.factor;
-      float3 p;
-      spline.sample_with_index_factors<float3>(spline_positions, {&index_factor, 1}, {&p, 1});
-      positions[curve_points[i]] = p;
-    }
+    lp::sample_at_lengths(data.old_lengths, data.sample_lengths, data.indices, data.factors);
+
+    lp::interpolate<float3>(data.old_positions, data.indices, data.factors, positions);
   }
 };
 
@@ -134,24 +141,23 @@ class ExtrapolateCurvesEffect : public CurvesEffect {
   {
     MutableSpan<float3> positions_cu = curves.positions_for_write();
     threading::parallel_for(curve_indices.index_range(), 256, [&](const IndexRange range) {
+      MoveAndResampleBuffers resample_buffer;
       for (const int influence_i : range) {
         const int curve_i = curve_indices[influence_i];
         const float move_distance_cu = move_distances_cu[influence_i];
-        const IndexRange curve_points = curves.points_for_curve(curve_i);
-
-        if (curve_points.size() <= 1) {
+        const IndexRange points = curves.points_for_curve(curve_i);
+        if (points.size() <= 1) {
           continue;
         }
 
-        const float3 old_last_pos_cu = positions_cu[curve_points.last()];
+        const float3 old_last_pos_cu = positions_cu[points.last()];
         /* Use some point within the curve rather than the end point to smooth out some random
          * variation. */
-        const float3 direction_reference_point =
-            positions_cu[curve_points[curve_points.size() / 2]];
+        const float3 direction_reference_point = positions_cu[points[points.size() / 2]];
         const float3 direction = math::normalize(old_last_pos_cu - direction_reference_point);
 
         const float3 new_last_pos_cu = old_last_pos_cu + direction * move_distance_cu;
-        move_last_point_and_resample(positions_cu.slice(curve_points), new_last_pos_cu);
+        move_last_point_and_resample(resample_buffer, positions_cu.slice(points), new_last_pos_cu);
       }
     });
   }
@@ -335,7 +341,8 @@ struct CurvesEffectOperationExecutor {
   void gather_influences_projected(
       threading::EnumerableThreadSpecific<Influences> &influences_for_thread)
   {
-    const Span<float3> positions_cu = curves_->positions();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
@@ -343,7 +350,7 @@ struct CurvesEffectOperationExecutor {
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
         eCurvesSymmetryType(curves_id_->symmetry));
     Vector<float4x4> symmetry_brush_transforms_inv;
-    for (const float4x4 brush_transform : symmetry_brush_transforms) {
+    for (const float4x4 &brush_transform : symmetry_brush_transforms) {
       symmetry_brush_transforms_inv.append(brush_transform.inverted());
     }
 
@@ -361,8 +368,8 @@ struct CurvesEffectOperationExecutor {
         float max_move_distance_cu = 0.0f;
         for (const float4x4 &brush_transform_inv : symmetry_brush_transforms_inv) {
           for (const int segment_i : points.drop_back(1)) {
-            const float3 p1_cu = brush_transform_inv * positions_cu[segment_i];
-            const float3 p2_cu = brush_transform_inv * positions_cu[segment_i + 1];
+            const float3 p1_cu = brush_transform_inv * deformation.positions[segment_i];
+            const float3 p2_cu = brush_transform_inv * deformation.positions[segment_i + 1];
 
             float2 p1_re, p2_re;
             ED_view3d_project_float_v2_m4(ctx_.region, p1_cu, p1_re, projection.values);
@@ -423,7 +430,8 @@ struct CurvesEffectOperationExecutor {
   void gather_influences_spherical(
       threading::EnumerableThreadSpecific<Influences> &influences_for_thread)
   {
-    const Span<float3> positions_cu = curves_->positions();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     float3 brush_pos_start_wo, brush_pos_end_wo;
     ED_view3d_win_to_3d(ctx_.v3d,
@@ -461,8 +469,8 @@ struct CurvesEffectOperationExecutor {
           const float3 brush_pos_end_transformed_cu = brush_transform * brush_pos_end_cu;
 
           for (const int segment_i : points.drop_back(1)) {
-            const float3 &p1_cu = positions_cu[segment_i];
-            const float3 &p2_cu = positions_cu[segment_i + 1];
+            const float3 &p1_cu = deformation.positions[segment_i];
+            const float3 &p2_cu = deformation.positions[segment_i + 1];
 
             float3 closest_on_segment_cu;
             float3 closest_on_brush_cu;
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_intern.hh b/source/blender/editors/sculpt_paint/curves_sculpt_intern.hh
index c31bba2fe1e..61e2559f303 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_intern.hh
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_intern.hh
@@ -12,8 +12,11 @@
 #include "BLI_virtual_array.hh"
 
 #include "BKE_attribute.h"
+#include "BKE_crazyspace.hh"
 #include "BKE_curves.hh"
 
+#include "ED_curves_sculpt.h"
+
 struct ARegion;
 struct RegionView3D;
 struct Depsgraph;
@@ -22,6 +25,7 @@ struct Object;
 struct Brush;
 struct Scene;
 struct BVHTreeFromMesh;
+struct ReportList;
 
 namespace blender::ed::sculpt_paint {
 
@@ -32,6 +36,7 @@ struct StrokeExtension {
   bool is_first;
   float2 mouse_position;
   float pressure;
+  ReportList *reports = nullptr;
 };
 
 float brush_radius_factor(const Brush &brush, const StrokeExtension &stroke_extension);
@@ -53,8 +58,7 @@ class CurvesSculptStrokeOperation {
   virtual void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) = 0;
 };
 
-std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation(const bContext &C,
-                                                               ReportList *reports);
+std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation();
 std::unique_ptr<CurvesSculptStrokeOperation> new_comb_operation();
 std::unique_ptr<CurvesSculptStrokeOperation> new_delete_operation();
 std::unique_ptr<CurvesSculptStrokeOperation> new_snake_hook_operation();
@@ -98,13 +102,23 @@ VArray<float> get_curves_selection(const Curves &curves_id);
  */
 VArray<float> get_point_selection(const Curves &curves_id);
 
+/** See #move_last_point_and_resample. */
+struct MoveAndResampleBuffers {
+  Array<float> orig_lengths;
+  Array<float> new_lengths;
+
+  Array<int> sample_indices;
+  Array<float> sample_factors;
+
+  Array<float3> new_positions;
+};
+
 /**
- * Find curves that have any point selected (a selection factor greater than zero),
- * or curves that have their own selection factor greater than zero.
+ * \param buffer: Reused memory to avoid reallocations when the function is called many times.
  */
-IndexMask retrieve_selected_curves(const Curves &curves_id, Vector<int64_t> &r_indices);
-
-void move_last_point_and_resample(MutableSpan<float3> positions, const float3 &new_last_position);
+void move_last_point_and_resample(MoveAndResampleBuffers &buffer,
+                                  MutableSpan<float3> positions,
+                                  const float3 &new_last_position);
 
 class CurvesSculptCommonContext {
  public:
@@ -130,4 +144,11 @@ float transform_brush_radius(const float4x4 &transform,
                              const float3 &brush_position,
                              const float old_radius);
 
+void report_empty_original_surface(ReportList *reports);
+void report_empty_evaluated_surface(ReportList *reports);
+void report_missing_surface(ReportList *reports);
+void report_missing_uv_map_on_original_surface(ReportList *reports);
+void report_missing_uv_map_on_evaluated_surface(ReportList *reports);
+void report_invalid_uv_map(ReportList *reports);
+
 }  // namespace blender::ed::sculpt_paint
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_ops.cc b/source/blender/editors/sculpt_paint/curves_sculpt_ops.cc
index 5c73c7a37d3..6e1ac24e21b 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_ops.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_ops.cc
@@ -9,6 +9,8 @@
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
 #include "BKE_curves.hh"
+#include "BKE_modifier.h"
+#include "BKE_object.h"
 #include "BKE_paint.h"
 
 #include "WM_api.h"
@@ -24,6 +26,7 @@
 #include "ED_view3d.h"
 
 #include "DEG_depsgraph.h"
+#include "DEG_depsgraph_query.h"
 
 #include "DNA_brush_types.h"
 #include "DNA_curves_types.h"
@@ -122,7 +125,7 @@ static std::unique_ptr<CurvesSculptStrokeOperation> start_brush_operation(
     case CURVES_SCULPT_TOOL_SNAKE_HOOK:
       return new_snake_hook_operation();
     case CURVES_SCULPT_TOOL_ADD:
-      return new_add_operation(C, op.reports);
+      return new_add_operation();
     case CURVES_SCULPT_TOOL_GROW_SHRINK:
       return new_grow_shrink_operation(mode, C);
     case CURVES_SCULPT_TOOL_SELECTION_PAINT:
@@ -147,7 +150,10 @@ struct SculptCurvesBrushStrokeData {
   PaintStroke *stroke;
 };
 
-static bool stroke_get_location(bContext *C, float out[3], const float mouse[2])
+static bool stroke_get_location(bContext *C,
+                                float out[3],
+                                const float mouse[2],
+                                bool UNUSED(force_original))
 {
   out[0] = mouse[0];
   out[1] = mouse[1];
@@ -173,6 +179,7 @@ static void stroke_update_step(bContext *C,
   StrokeExtension stroke_extension;
   RNA_float_get_array(stroke_element, "mouse", stroke_extension.mouse_position);
   stroke_extension.pressure = RNA_float_get(stroke_element, "pressure");
+  stroke_extension.reports = op->reports;
 
   if (!op_data->operation) {
     stroke_extension.is_first = true;
@@ -262,18 +269,6 @@ static void SCULPT_CURVES_OT_brush_stroke(struct wmOperatorType *ot)
 /** \name * CURVES_OT_sculptmode_toggle
  * \{ */
 
-static bool curves_sculptmode_toggle_poll(bContext *C)
-{
-  const Object *ob = CTX_data_active_object(C);
-  if (ob == nullptr) {
-    return false;
-  }
-  if (ob->type != OB_CURVES) {
-    return false;
-  }
-  return true;
-}
-
 static void curves_sculptmode_enter(bContext *C)
 {
   Scene *scene = CTX_data_scene(C);
@@ -335,7 +330,7 @@ static void CURVES_OT_sculptmode_toggle(wmOperatorType *ot)
   ot->description = "Enter/Exit sculpt mode for curves";
 
   ot->exec = curves_sculptmode_toggle_exec;
-  ot->poll = curves_sculptmode_toggle_poll;
+  ot->poll = curves::curves_poll;
 
   ot->flag = OPTYPE_UNDO | OPTYPE_REGISTER;
 }
@@ -478,7 +473,7 @@ static void SCULPT_CURVES_OT_select_random(wmOperatorType *ot)
   ot->description = "Randomizes existing selection or create new random selection";
 
   ot->exec = select_random::select_random_exec;
-  ot->poll = curves::selection_operator_poll;
+  ot->poll = curves::editable_curves_poll;
   ot->ui = select_random::select_random_ui;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
@@ -522,7 +517,7 @@ static void SCULPT_CURVES_OT_select_random(wmOperatorType *ot)
 namespace select_end {
 static bool select_end_poll(bContext *C)
 {
-  if (!curves::selection_operator_poll(C)) {
+  if (!curves::editable_curves_poll(C)) {
     return false;
   }
   const Curves *curves_id = static_cast<const Curves *>(CTX_data_active_object(C)->data);
@@ -739,6 +734,8 @@ static void select_grow_invoke_per_curve(Curves &curves_id,
   }
 
   threading::parallel_invoke(
+      1024 < curve_op_data.selected_point_indices.size() +
+                 curve_op_data.unselected_point_indices.size(),
       [&]() {
         /* Build KD-tree for the selected points. */
         KDTree_3d *kdtree = BLI_kdtree_3d_new(curve_op_data.selected_point_indices.size());
@@ -904,7 +901,7 @@ static void SCULPT_CURVES_OT_select_grow(wmOperatorType *ot)
 
   ot->invoke = select_grow::select_grow_invoke;
   ot->modal = select_grow::select_grow_modal;
-  ot->poll = curves::selection_operator_poll;
+  ot->poll = curves::editable_curves_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
@@ -925,16 +922,7 @@ namespace min_distance_edit {
 
 static bool min_distance_edit_poll(bContext *C)
 {
-  Object *ob = CTX_data_active_object(C);
-  if (ob == nullptr) {
-    return false;
-  }
-  if (ob->type != OB_CURVES) {
-    return false;
-  }
-  Curves *curves_id = static_cast<Curves *>(ob->data);
-  if (curves_id->surface == nullptr || curves_id->surface->type != OB_MESH) {
-    CTX_wm_operator_poll_msg_set(C, "Curves must have a mesh surface object set");
+  if (!curves::curves_with_surface_poll(C)) {
     return false;
   }
   Scene *scene = CTX_data_scene(C);
@@ -1110,7 +1098,7 @@ static void min_distance_edit_draw(bContext *C, int UNUSED(x), int UNUSED(y), vo
   GPUVertFormat *format = immVertexFormat();
   uint pos2d = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3fvAlpha(circle_col, circle_alpha);
   imm_draw_circle_wire_2d(pos2d, 0.0f, 0.0f, brush_radius_re, 80);
@@ -1126,14 +1114,21 @@ static int min_distance_edit_invoke(bContext *C, wmOperator *op, const wmEvent *
   View3D *v3d = CTX_wm_view3d(C);
   Scene *scene = CTX_data_scene(C);
 
-  Object &curves_ob = *CTX_data_active_object(C);
-  Curves &curves_id = *static_cast<Curves *>(curves_ob.data);
-  Object &surface_ob = *curves_id.surface;
-  Mesh &surface_me = *static_cast<Mesh *>(surface_ob.data);
+  Object &curves_ob_orig = *CTX_data_active_object(C);
+  Curves &curves_id_orig = *static_cast<Curves *>(curves_ob_orig.data);
+  Object &surface_ob_orig = *curves_id_orig.surface;
+  Object *surface_ob_eval = DEG_get_evaluated_object(depsgraph, &surface_ob_orig);
+  if (surface_ob_eval == nullptr) {
+    return OPERATOR_CANCELLED;
+  }
+  Mesh *surface_me_eval = BKE_object_get_evaluated_mesh(surface_ob_eval);
+  if (surface_me_eval == nullptr) {
+    return OPERATOR_CANCELLED;
+  }
 
-  BVHTreeFromMesh surface_bvh;
-  BKE_bvhtree_from_mesh_get(&surface_bvh, &surface_me, BVHTREE_FROM_LOOPTRI, 2);
-  BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh); });
+  BVHTreeFromMesh surface_bvh_eval;
+  BKE_bvhtree_from_mesh_get(&surface_bvh_eval, surface_me_eval, BVHTREE_FROM_LOOPTRI, 2);
+  BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval); });
 
   const int2 mouse_pos_int_re{event->mval};
   const float2 mouse_pos_re{mouse_pos_int_re};
@@ -1142,23 +1137,22 @@ static int min_distance_edit_invoke(bContext *C, wmOperator *op, const wmEvent *
   ED_view3d_win_to_segment_clipped(
       depsgraph, region, v3d, mouse_pos_re, ray_start_wo, ray_end_wo, true);
 
-  const float4x4 surface_to_world_mat = surface_ob.obmat;
-  const float4x4 world_to_surface_mat = surface_to_world_mat.inverted();
+  const CurvesSurfaceTransforms transforms{curves_ob_orig, &surface_ob_orig};
 
-  const float3 ray_start_su = world_to_surface_mat * ray_start_wo;
-  const float3 ray_end_su = world_to_surface_mat * ray_end_wo;
+  const float3 ray_start_su = transforms.world_to_surface * ray_start_wo;
+  const float3 ray_end_su = transforms.world_to_surface * ray_end_wo;
   const float3 ray_direction_su = math::normalize(ray_end_su - ray_start_su);
 
   BVHTreeRayHit ray_hit;
   ray_hit.dist = FLT_MAX;
   ray_hit.index = -1;
-  BLI_bvhtree_ray_cast(surface_bvh.tree,
+  BLI_bvhtree_ray_cast(surface_bvh_eval.tree,
                        ray_start_su,
                        ray_direction_su,
                        0.0f,
                        &ray_hit,
-                       surface_bvh.raycast_callback,
-                       &surface_bvh);
+                       surface_bvh_eval.raycast_callback,
+                       &surface_bvh_eval);
   if (ray_hit.index == -1) {
     WM_report(RPT_ERROR, "Cursor must be over the surface mesh");
     return OPERATOR_CANCELLED;
@@ -1166,16 +1160,13 @@ static int min_distance_edit_invoke(bContext *C, wmOperator *op, const wmEvent *
 
   const float3 hit_pos_su = ray_hit.co;
   const float3 hit_normal_su = ray_hit.no;
-  const float4x4 curves_to_world_mat = curves_ob.obmat;
-  const float4x4 world_to_curves_mat = curves_to_world_mat.inverted();
-  const float4x4 surface_to_curves_mat = world_to_curves_mat * surface_to_world_mat;
-  const float4x4 surface_to_curves_normal_mat = surface_to_curves_mat.inverted().transposed();
 
-  const float3 hit_pos_cu = surface_to_curves_mat * hit_pos_su;
-  const float3 hit_normal_cu = math::normalize(surface_to_curves_normal_mat * hit_normal_su);
+  const float3 hit_pos_cu = transforms.surface_to_curves * hit_pos_su;
+  const float3 hit_normal_cu = math::normalize(transforms.surface_to_curves_normal *
+                                               hit_normal_su);
 
   MinDistanceEditData *op_data = MEM_new<MinDistanceEditData>(__func__);
-  op_data->curves_to_world_mat = curves_to_world_mat;
+  op_data->curves_to_world_mat = transforms.curves_to_world;
   op_data->normal_cu = hit_normal_cu;
   op_data->pos_cu = hit_pos_cu;
   op_data->initial_mouse = event->xy;
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_pinch.cc b/source/blender/editors/sculpt_paint/curves_sculpt_pinch.cc
index 689b7d22e5e..3e43b1a6361 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_pinch.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_pinch.cc
@@ -157,6 +157,9 @@ struct PinchOperationExecutor {
   {
     const float4x4 brush_transform_inv = brush_transform.inverted();
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
     MutableSpan<float3> positions_cu = curves_->positions_for_write();
@@ -167,11 +170,13 @@ struct PinchOperationExecutor {
       for (const int curve_i : curve_selection_.slice(range)) {
         const IndexRange points = curves_->points_for_curve(curve_i);
         for (const int point_i : points.drop_front(1)) {
-          const float3 old_pos_cu = brush_transform_inv * positions_cu[point_i];
-          float2 old_pos_re;
-          ED_view3d_project_float_v2_m4(ctx_.region, old_pos_cu, old_pos_re, projection.values);
+          const float3 old_pos_cu = deformation.positions[point_i];
+          const float3 old_symm_pos_cu = brush_transform_inv * old_pos_cu;
+          float2 old_symm_pos_re;
+          ED_view3d_project_float_v2_m4(
+              ctx_.region, old_symm_pos_cu, old_symm_pos_re, projection.values);
 
-          const float dist_to_brush_sq_re = math::distance_squared(old_pos_re, brush_pos_re_);
+          const float dist_to_brush_sq_re = math::distance_squared(old_symm_pos_re, brush_pos_re_);
           if (dist_to_brush_sq_re > brush_radius_sq_re) {
             continue;
           }
@@ -182,14 +187,21 @@ struct PinchOperationExecutor {
           const float weight = invert_factor_ * 0.1f * brush_strength_ * radius_falloff *
                                point_factors_[point_i];
 
-          const float2 new_pos_re = math::interpolate(old_pos_re, brush_pos_re_, weight);
-
-          const float3 old_pos_wo = transforms_.curves_to_world * old_pos_cu;
-          float3 new_pos_wo;
-          ED_view3d_win_to_3d(ctx_.v3d, ctx_.region, old_pos_wo, new_pos_re, new_pos_wo);
-
-          const float3 new_pos_cu = transforms_.world_to_curves * new_pos_wo;
-          positions_cu[point_i] = brush_transform * new_pos_cu;
+          const float2 new_symm_pos_re = math::interpolate(old_symm_pos_re, brush_pos_re_, weight);
+
+          float3 new_symm_pos_wo;
+          ED_view3d_win_to_3d(ctx_.v3d,
+                              ctx_.region,
+                              transforms_.curves_to_world * old_symm_pos_cu,
+                              new_symm_pos_re,
+                              new_symm_pos_wo);
+
+          const float3 new_pos_cu = brush_transform * transforms_.world_to_curves *
+                                    new_symm_pos_wo;
+          const float3 translation_eval = new_pos_cu - old_pos_cu;
+          const float3 translation_orig = deformation.translation_from_deformed_to_original(
+              point_i, translation_eval);
+          positions_cu[point_i] += translation_orig;
           r_changed_curves[curve_i] = true;
         }
       }
@@ -221,11 +233,14 @@ struct PinchOperationExecutor {
     MutableSpan<float3> positions_cu = curves_->positions_for_write();
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
       for (const int curve_i : curve_selection_.slice(range)) {
         const IndexRange points = curves_->points_for_curve(curve_i);
         for (const int point_i : points.drop_front(1)) {
-          const float3 old_pos_cu = positions_cu[point_i];
+          const float3 old_pos_cu = deformation.positions[point_i];
 
           const float dist_to_brush_sq_cu = math::distance_squared(old_pos_cu, brush_pos_cu);
           if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
@@ -239,7 +254,10 @@ struct PinchOperationExecutor {
                                point_factors_[point_i];
 
           const float3 new_pos_cu = math::interpolate(old_pos_cu, brush_pos_cu, weight);
-          positions_cu[point_i] = new_pos_cu;
+          const float3 translation_eval = new_pos_cu - old_pos_cu;
+          const float3 translation_orig = deformation.translation_from_deformed_to_original(
+              point_i, translation_eval);
+          positions_cu[point_i] += translation_orig;
 
           r_changed_curves[curve_i] = true;
         }
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_puff.cc b/source/blender/editors/sculpt_paint/curves_sculpt_puff.cc
index 83cfda6dc00..ec69aae372c 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_puff.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_puff.cc
@@ -4,6 +4,7 @@
 #include "BKE_brush.h"
 #include "BKE_bvhutils.h"
 #include "BKE_context.h"
+#include "BKE_crazyspace.hh"
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 
@@ -20,6 +21,8 @@
 
 #include "BLI_length_parameterize.hh"
 
+#include "GEO_add_curves_on_mesh.hh"
+
 #include "curves_sculpt_intern.hh"
 
 namespace blender::ed::sculpt_paint {
@@ -38,23 +41,6 @@ class PuffOperation : public CurvesSculptStrokeOperation {
   void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
 };
 
-static float3 compute_surface_point_normal(const MLoopTri &looptri,
-                                           const float3 &bary_coord,
-                                           const Span<float3> corner_normals)
-{
-  const int l0 = looptri.tri[0];
-  const int l1 = looptri.tri[1];
-  const int l2 = looptri.tri[2];
-
-  const float3 &l0_normal = corner_normals[l0];
-  const float3 &l1_normal = corner_normals[l1];
-  const float3 &l2_normal = corner_normals[l2];
-
-  const float3 normal = math::normalize(
-      attribute_math::mix3(bary_coord, l0_normal, l1_normal, l2_normal));
-  return normal;
-}
-
 /**
  * Utility class that actually executes the update when the stroke is updated. That's useful
  * because it avoids passing a very large number of parameters between functions.
@@ -84,6 +70,8 @@ struct PuffOperationExecutor {
 
   Object *surface_ob_ = nullptr;
   Mesh *surface_ = nullptr;
+  Span<MVert> surface_verts_;
+  Span<MLoop> surface_loops_;
   Span<MLoopTri> surface_looptris_;
   Span<float3> corner_normals_su_;
   BVHTreeFromMesh surface_bvh_;
@@ -131,11 +119,12 @@ struct PuffOperationExecutor {
         reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_->ldata, CD_NORMAL)),
         surface_->totloop};
 
-    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
-    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
-
+    surface_verts_ = surface_->verts();
+    surface_loops_ = surface_->loops();
     surface_looptris_ = {BKE_mesh_runtime_looptri_ensure(surface_),
                          BKE_mesh_runtime_looptri_len(surface_)};
+    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
+    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
 
     if (stroke_extension.is_first) {
       this->initialize_segment_lengths();
@@ -183,8 +172,6 @@ struct PuffOperationExecutor {
   void find_curve_weights_projected(const float4x4 &brush_transform,
                                     MutableSpan<float> r_curve_weights)
   {
-    Span<float3> positions_cu = curves_->positions();
-
     const float4x4 brush_transform_inv = brush_transform.inverted();
 
     float4x4 projection;
@@ -193,15 +180,18 @@ struct PuffOperationExecutor {
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
       for (const int curve_selection_i : range) {
         const int curve_i = curve_selection_[curve_selection_i];
         const IndexRange points = curves_->points_for_curve(curve_i);
-        const float3 first_pos_cu = brush_transform_inv * positions_cu[points[0]];
+        const float3 first_pos_cu = brush_transform_inv * deformation.positions[points[0]];
         float2 prev_pos_re;
         ED_view3d_project_float_v2_m4(ctx_.region, first_pos_cu, prev_pos_re, projection.values);
         for (const int point_i : points.drop_front(1)) {
-          const float3 pos_cu = brush_transform_inv * positions_cu[point_i];
+          const float3 pos_cu = brush_transform_inv * deformation.positions[point_i];
           float2 pos_re;
           ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
           BLI_SCOPED_DEFER([&]() { prev_pos_re = pos_re; });
@@ -248,16 +238,18 @@ struct PuffOperationExecutor {
                                      const float brush_radius_cu,
                                      MutableSpan<float> r_curve_weights)
   {
-    const Span<float3> positions_cu = curves_->positions();
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
       for (const int curve_selection_i : range) {
         const int curve_i = curve_selection_[curve_selection_i];
         const IndexRange points = curves_->points_for_curve(curve_i);
         for (const int point_i : points.drop_front(1)) {
-          const float3 &prev_pos_cu = positions_cu[point_i - 1];
-          const float3 &pos_cu = positions_cu[point_i];
+          const float3 &prev_pos_cu = deformation.positions[point_i - 1];
+          const float3 &pos_cu = deformation.positions[point_i];
           const float dist_to_brush_sq_cu = dist_squared_to_line_segment_v3(
               brush_pos_cu, prev_pos_cu, pos_cu);
           if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
@@ -300,12 +292,12 @@ struct PuffOperationExecutor {
 
         const MLoopTri &looptri = surface_looptris_[nearest.index];
         const float3 closest_pos_su = nearest.co;
-        const float3 &v0_su = surface_->mvert[surface_->mloop[looptri.tri[0]].v].co;
-        const float3 &v1_su = surface_->mvert[surface_->mloop[looptri.tri[1]].v].co;
-        const float3 &v2_su = surface_->mvert[surface_->mloop[looptri.tri[2]].v].co;
+        const float3 &v0_su = surface_verts_[surface_loops_[looptri.tri[0]].v].co;
+        const float3 &v1_su = surface_verts_[surface_loops_[looptri.tri[1]].v].co;
+        const float3 &v2_su = surface_verts_[surface_loops_[looptri.tri[2]].v].co;
         float3 bary_coords;
         interp_weights_tri_v3(bary_coords, v0_su, v1_su, v2_su, closest_pos_su);
-        const float3 normal_su = compute_surface_point_normal(
+        const float3 normal_su = geometry::compute_surface_point_normal(
             looptri, bary_coords, corner_normals_su_);
         const float3 normal_cu = math::normalize(transforms_.surface_to_curves_normal * normal_su);
 
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_selection.cc b/source/blender/editors/sculpt_paint/curves_sculpt_selection.cc
index f620fed5761..a955a074df2 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_selection.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_selection.cc
@@ -6,6 +6,8 @@
 
 #include "curves_sculpt_intern.hh"
 
+#include "ED_curves_sculpt.h"
+
 namespace blender::ed::sculpt_paint {
 
 static VArray<float> get_curves_selection(const CurvesGeometry &curves, const eAttrDomain domain)
@@ -62,13 +64,14 @@ static IndexMask retrieve_selected_curves(const CurvesGeometry &curves,
     case ATTR_DOMAIN_POINT: {
       const VArray<float> selection = curves.selection_point_float();
       if (selection.is_single()) {
-        return selection.get_internal_single() == 0.0f ? IndexMask(0) :
+        return selection.get_internal_single() <= 0.0f ? IndexMask(0) :
                                                          IndexMask(curves.curves_num());
       }
+      const Span<float> point_selection_span = selection.get_internal_span();
       return index_mask_ops::find_indices_based_on_predicate(
           curves.curves_range(), 512, r_indices, [&](const int curve_i) {
             for (const int i : curves.points_for_curve(curve_i)) {
-              if (selection[i] > 0.0f) {
+              if (point_selection_span[i] > 0.0f) {
                 return true;
               }
             }
@@ -78,7 +81,7 @@ static IndexMask retrieve_selected_curves(const CurvesGeometry &curves,
     case ATTR_DOMAIN_CURVE: {
       const VArray<float> selection = curves.selection_curve_float();
       if (selection.is_single()) {
-        return selection.get_internal_single() == 0.0f ? IndexMask(0) :
+        return selection.get_internal_single() <= 0.0f ? IndexMask(0) :
                                                          IndexMask(curves.curves_num());
       }
       return index_mask_ops::find_indices_based_on_predicate(
@@ -102,4 +105,49 @@ IndexMask retrieve_selected_curves(const Curves &curves_id, Vector<int64_t> &r_i
                                   r_indices);
 }
 
+static IndexMask retrieve_selected_points(const CurvesGeometry &curves,
+                                          const eAttrDomain domain,
+                                          Vector<int64_t> &r_indices)
+{
+  switch (domain) {
+    case ATTR_DOMAIN_POINT: {
+      const VArray<float> selection = curves.selection_point_float();
+      if (selection.is_single()) {
+        return selection.get_internal_single() <= 0.0f ? IndexMask(0) :
+                                                         IndexMask(curves.points_num());
+      }
+      return index_mask_ops::find_indices_based_on_predicate(
+          curves.points_range(), 2048, r_indices, [&](const int i) {
+            return selection[i] > 0.0f;
+          });
+    }
+    case ATTR_DOMAIN_CURVE: {
+      const VArray<float> selection = curves.selection_curve_float();
+      if (selection.is_single()) {
+        return selection.get_internal_single() <= 0.0f ? IndexMask(0) :
+                                                         IndexMask(curves.points_num());
+      }
+      const VArray<float> point_selection = curves.adapt_domain(
+          selection, ATTR_DOMAIN_CURVE, ATTR_DOMAIN_POINT);
+      return index_mask_ops::find_indices_based_on_predicate(
+          curves.points_range(), 2048, r_indices, [&](const int i) {
+            return point_selection[i] > 0.0f;
+          });
+    }
+    default:
+      BLI_assert_unreachable();
+      return {};
+  }
+}
+
+IndexMask retrieve_selected_points(const Curves &curves_id, Vector<int64_t> &r_indices)
+{
+  if (!(curves_id.flag & CV_SCULPT_SELECTION_ENABLED)) {
+    return CurvesGeometry::wrap(curves_id.geometry).points_range();
+  }
+  return retrieve_selected_points(CurvesGeometry::wrap(curves_id.geometry),
+                                  eAttrDomain(curves_id.selection_domain),
+                                  r_indices);
+}
+
 }  // namespace blender::ed::sculpt_paint
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_selection_paint.cc b/source/blender/editors/sculpt_paint/curves_sculpt_selection_paint.cc
index 399d2c73ec3..cc5a5e7ae8a 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_selection_paint.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_selection_paint.cc
@@ -161,14 +161,15 @@ struct SelectionPaintOperationExecutor {
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
 
-    Span<float3> positions_cu = curves_->positions();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
     threading::parallel_for(curves_->points_range(), 1024, [&](const IndexRange point_range) {
       for (const int point_i : point_range) {
-        const float3 pos_cu = brush_transform_inv * positions_cu[point_i];
+        const float3 pos_cu = brush_transform_inv * deformation.positions[point_i];
 
         /* Find the position of the point in screen space. */
         float2 pos_re;
@@ -215,14 +216,15 @@ struct SelectionPaintOperationExecutor {
 
   void paint_point_selection_spherical(MutableSpan<float> selection, const float3 &brush_cu)
   {
-    Span<float3> positions_cu = curves_->positions();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     const float brush_radius_cu = self_->brush_3d_.radius_cu;
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
     threading::parallel_for(curves_->points_range(), 1024, [&](const IndexRange point_range) {
       for (const int i : point_range) {
-        const float3 pos_old_cu = positions_cu[i];
+        const float3 pos_old_cu = deformation.positions[i];
 
         /* Compute distance to the brush. */
         const float distance_to_brush_sq_cu = math::distance_squared(pos_old_cu, brush_cu);
@@ -256,9 +258,11 @@ struct SelectionPaintOperationExecutor {
   void paint_curve_selection_projected(const float4x4 &brush_transform,
                                        MutableSpan<float> selection)
   {
-    const Span<float3> positions_cu = curves_->positions();
     const float4x4 brush_transform_inv = brush_transform.inverted();
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
 
@@ -274,8 +278,8 @@ struct SelectionPaintOperationExecutor {
             [&](const IndexRange segment_range, const float init) {
               float max_weight = init;
               for (const int segment_i : segment_range) {
-                const float3 pos1_cu = brush_transform_inv * positions_cu[segment_i];
-                const float3 pos2_cu = brush_transform_inv * positions_cu[segment_i + 1];
+                const float3 pos1_cu = brush_transform_inv * deformation.positions[segment_i];
+                const float3 pos2_cu = brush_transform_inv * deformation.positions[segment_i + 1];
 
                 float2 pos1_re;
                 float2 pos2_re;
@@ -323,7 +327,8 @@ struct SelectionPaintOperationExecutor {
 
   void paint_curve_selection_spherical(MutableSpan<float> selection, const float3 &brush_cu)
   {
-    const Span<float3> positions_cu = curves_->positions();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     const float brush_radius_cu = self_->brush_3d_.radius_cu;
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
@@ -337,8 +342,8 @@ struct SelectionPaintOperationExecutor {
             [&](const IndexRange segment_range, const float init) {
               float max_weight = init;
               for (const int segment_i : segment_range) {
-                const float3 &pos1_cu = positions_cu[segment_i];
-                const float3 &pos2_cu = positions_cu[segment_i + 1];
+                const float3 &pos1_cu = deformation.positions[segment_i];
+                const float3 &pos2_cu = deformation.positions[segment_i + 1];
 
                 const float distance_sq_cu = dist_squared_to_line_segment_v3(
                     brush_cu, pos1_cu, pos2_cu);
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_slide.cc b/source/blender/editors/sculpt_paint/curves_sculpt_slide.cc
index aabe6fd93e4..1108f5c72a9 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_slide.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_slide.cc
@@ -4,6 +4,7 @@
 
 #include "curves_sculpt_intern.hh"
 
+#include "BLI_float3x3.hh"
 #include "BLI_float4x4.hh"
 #include "BLI_vector.hh"
 
@@ -20,14 +21,16 @@
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_mesh_sample.hh"
+#include "BKE_modifier.h"
+#include "BKE_object.h"
 #include "BKE_paint.h"
+#include "BKE_report.h"
 
 #include "DNA_brush_enums.h"
 #include "DNA_brush_types.h"
 #include "DNA_curves_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_meshdata_types.h"
-#include "DNA_object_types.h"
 #include "DNA_screen_types.h"
 #include "DNA_space_types.h"
 
@@ -38,13 +41,27 @@
 
 #include "WM_api.h"
 
+#include "DEG_depsgraph_query.h"
+
+#include "GEO_add_curves_on_mesh.hh"
+#include "GEO_reverse_uv_sampler.hh"
+
+#include "BLT_translation.h"
+
 namespace blender::ed::sculpt_paint {
 
+using geometry::ReverseUVSampler;
+
 struct SlideCurveInfo {
   /** Index of the curve to slide. */
   int curve_i;
   /** A weight based on the initial distance to the brush. */
   float radius_falloff;
+  /**
+   * Normal of the surface where the curve was attached. This is used to rotate the curve if it is
+   * moved to a place with a different normal.
+   */
+  float3 initial_normal_cu;
 };
 
 struct SlideInfo {
@@ -55,10 +72,13 @@ struct SlideInfo {
 
 class SlideOperation : public CurvesSculptStrokeOperation {
  private:
-  /** Last mouse position. */
-  float2 brush_pos_last_re_;
+  float2 initial_brush_pos_re_;
   /** Information about which curves to slide. This is initialized when the brush starts. */
   Vector<SlideInfo> slide_info_;
+  /** Positions of all curve points at the start of sliding. */
+  Array<float3> initial_positions_cu_;
+  /** Deformed positions of all curve points at the start of sliding. */
+  Array<float3> initial_deformed_positions_cu_;
 
   friend struct SlideOperationExecutor;
 
@@ -80,27 +100,33 @@ struct SlideOperationExecutor {
   float brush_radius_factor_;
   float brush_strength_;
 
-  Object *object_ = nullptr;
-  Curves *curves_id_ = nullptr;
-  CurvesGeometry *curves_ = nullptr;
+  Object *curves_ob_orig_ = nullptr;
+  Curves *curves_id_orig_ = nullptr;
+  CurvesGeometry *curves_orig_ = nullptr;
 
-  Object *surface_ob_ = nullptr;
-  Mesh *surface_ = nullptr;
-  Span<MLoopTri> surface_looptris_;
-  VArraySpan<float2> surface_uv_map_;
+  Object *surface_ob_orig_ = nullptr;
+  Mesh *surface_orig_ = nullptr;
+  Span<MLoopTri> surface_looptris_orig_;
+  VArraySpan<float2> surface_uv_map_orig_;
+  Span<float3> corner_normals_orig_su_;
+
+  Object *surface_ob_eval_ = nullptr;
+  Mesh *surface_eval_ = nullptr;
+  Span<MVert> surface_verts_eval_;
+  Span<MLoop> surface_loops_eval_;
+  Span<MLoopTri> surface_looptris_eval_;
+  VArraySpan<float2> surface_uv_map_eval_;
+  BVHTreeFromMesh surface_bvh_eval_;
 
   VArray<float> curve_factors_;
-  VArray<float> point_factors_;
   Vector<int64_t> selected_curve_indices_;
   IndexMask curve_selection_;
 
-  float2 brush_pos_prev_re_;
   float2 brush_pos_re_;
-  float2 brush_pos_diff_re_;
 
   CurvesSurfaceTransforms transforms_;
 
-  BVHTreeFromMesh surface_bvh_;
+  std::atomic<bool> found_invalid_uv_mapping_{false};
 
   SlideOperationExecutor(const bContext &C) : ctx_(C)
   {
@@ -111,15 +137,27 @@ struct SlideOperationExecutor {
     UNUSED_VARS(C, stroke_extension);
     self_ = &self;
 
-    object_ = CTX_data_active_object(&C);
-    curves_id_ = static_cast<Curves *>(object_->data);
-    curves_ = &CurvesGeometry::wrap(curves_id_->geometry);
-    if (curves_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
+    curves_ob_orig_ = CTX_data_active_object(&C);
+    curves_id_orig_ = static_cast<Curves *>(curves_ob_orig_->data);
+    curves_orig_ = &CurvesGeometry::wrap(curves_id_orig_->geometry);
+    if (curves_id_orig_->surface == nullptr || curves_id_orig_->surface->type != OB_MESH) {
+      report_missing_surface(stroke_extension.reports);
+      return;
+    }
+    if (curves_orig_->curves_num() == 0) {
+      return;
+    }
+    if (curves_id_orig_->surface_uv_map == nullptr) {
+      report_missing_uv_map_on_original_surface(stroke_extension.reports);
       return;
     }
-    if (curves_->curves_num() == 0) {
+    if (curves_orig_->surface_uv_coords().is_empty()) {
+      BKE_report(stroke_extension.reports,
+                 RPT_WARNING,
+                 TIP_("Curves do not have surface attachment information"));
       return;
     }
+    const StringRefNull uv_map_name = curves_id_orig_->surface_uv_map;
 
     curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
     brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
@@ -127,169 +165,322 @@ struct SlideOperationExecutor {
     brush_radius_factor_ = brush_radius_factor(*brush_, stroke_extension);
     brush_strength_ = brush_strength_get(*ctx_.scene, *brush_, stroke_extension);
 
-    curve_factors_ = get_curves_selection(*curves_id_);
-    point_factors_ = get_point_selection(*curves_id_);
-    curve_selection_ = retrieve_selected_curves(*curves_id_, selected_curve_indices_);
+    curve_factors_ = get_curves_selection(*curves_id_orig_);
+    curve_selection_ = retrieve_selected_curves(*curves_id_orig_, selected_curve_indices_);
 
-    brush_pos_prev_re_ = self_->brush_pos_last_re_;
     brush_pos_re_ = stroke_extension.mouse_position;
-    brush_pos_diff_re_ = brush_pos_re_ - brush_pos_prev_re_;
-    BLI_SCOPED_DEFER([&]() { self_->brush_pos_last_re_ = brush_pos_re_; });
-
-    transforms_ = CurvesSurfaceTransforms(*object_, curves_id_->surface);
 
-    surface_ob_ = curves_id_->surface;
-    surface_ = static_cast<Mesh *>(surface_ob_->data);
+    transforms_ = CurvesSurfaceTransforms(*curves_ob_orig_, curves_id_orig_->surface);
 
-    BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_LOOPTRI, 2);
-    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
-
-    surface_looptris_ = {BKE_mesh_runtime_looptri_ensure(surface_),
-                         BKE_mesh_runtime_looptri_len(surface_)};
+    surface_ob_orig_ = curves_id_orig_->surface;
+    surface_orig_ = static_cast<Mesh *>(surface_ob_orig_->data);
+    if (surface_orig_->totpoly == 0) {
+      report_empty_original_surface(stroke_extension.reports);
+      return;
+    }
+    surface_looptris_orig_ = {BKE_mesh_runtime_looptri_ensure(surface_orig_),
+                              BKE_mesh_runtime_looptri_len(surface_orig_)};
+    surface_uv_map_orig_ = surface_orig_->attributes().lookup<float2>(uv_map_name,
+                                                                      ATTR_DOMAIN_CORNER);
+    if (surface_uv_map_orig_.is_empty()) {
+      report_missing_uv_map_on_original_surface(stroke_extension.reports);
+      return;
+    }
+    if (!CustomData_has_layer(&surface_orig_->ldata, CD_NORMAL)) {
+      BKE_mesh_calc_normals_split(surface_orig_);
+    }
+    corner_normals_orig_su_ = {
+        reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_orig_->ldata, CD_NORMAL)),
+        surface_orig_->totloop};
 
-    if (curves_id_->surface_uv_map != nullptr) {
-      const bke::AttributeAccessor surface_attributes = bke::mesh_attributes(*surface_);
-      surface_uv_map_ = surface_attributes.lookup<float2>(curves_id_->surface_uv_map,
-                                                          ATTR_DOMAIN_CORNER);
+    surface_ob_eval_ = DEG_get_evaluated_object(ctx_.depsgraph, surface_ob_orig_);
+    if (surface_ob_eval_ == nullptr) {
+      return;
+    }
+    surface_eval_ = BKE_object_get_evaluated_mesh(surface_ob_eval_);
+    if (surface_eval_ == nullptr) {
+      return;
+    }
+    if (surface_eval_->totpoly == 0) {
+      report_empty_evaluated_surface(stroke_extension.reports);
+      return;
+    }
+    surface_looptris_eval_ = {BKE_mesh_runtime_looptri_ensure(surface_eval_),
+                              BKE_mesh_runtime_looptri_len(surface_eval_)};
+    surface_verts_eval_ = surface_eval_->verts();
+    surface_loops_eval_ = surface_eval_->loops();
+    surface_uv_map_eval_ = surface_eval_->attributes().lookup<float2>(uv_map_name,
+                                                                      ATTR_DOMAIN_CORNER);
+    if (surface_uv_map_eval_.is_empty()) {
+      report_missing_uv_map_on_evaluated_surface(stroke_extension.reports);
+      return;
     }
+    BKE_bvhtree_from_mesh_get(&surface_bvh_eval_, surface_eval_, BVHTREE_FROM_LOOPTRI, 2);
+    BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval_); });
 
     if (stroke_extension.is_first) {
-      const Vector<float4x4> brush_transforms = get_symmetry_brush_transforms(
-          eCurvesSymmetryType(curves_id_->symmetry));
-      for (const float4x4 &brush_transform : brush_transforms) {
-        this->detect_curves_to_slide(brush_transform);
-      }
+      self_->initial_brush_pos_re_ = brush_pos_re_;
+      /* Remember original and deformed positions of all points. Otherwise this information is lost
+       * when sliding starts, but it's still used. */
+      const bke::crazyspace::GeometryDeformation deformation =
+          bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *curves_ob_orig_);
+      self_->initial_positions_cu_ = curves_orig_->positions();
+      self_->initial_deformed_positions_cu_ = deformation.positions;
+
+      /* First find all curves to slide. When the mouse moves, only those curves  will be moved. */
+      this->find_curves_to_slide_with_symmetry();
       return;
     }
-    this->slide_projected();
+    this->slide_with_symmetry();
 
-    curves_->tag_positions_changed();
-    DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
-    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
+    if (found_invalid_uv_mapping_) {
+      BKE_report(
+          stroke_extension.reports, RPT_WARNING, TIP_("UV map or surface attachment is invalid"));
+    }
+
+    curves_orig_->tag_positions_changed();
+    DEG_id_tag_update(&curves_id_orig_->id, ID_RECALC_GEOMETRY);
+    WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_orig_->id);
     ED_region_tag_redraw(ctx_.region);
   }
 
-  void detect_curves_to_slide(const float4x4 &brush_transform)
+  void find_curves_to_slide_with_symmetry()
   {
-    const float4x4 brush_transform_inv = brush_transform.inverted();
-
+    const Vector<float4x4> brush_transforms = get_symmetry_brush_transforms(
+        eCurvesSymmetryType(curves_id_orig_->symmetry));
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
-    const float brush_radius_sq_re = pow2f(brush_radius_re);
-
-    const Span<float3> positions_cu = curves_->positions();
-
-    float4x4 projection;
-    ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
+    const std::optional<CurvesBrush3D> brush_3d = sample_curves_surface_3d_brush(*ctx_.depsgraph,
+                                                                                 *ctx_.region,
+                                                                                 *ctx_.v3d,
+                                                                                 transforms_,
+                                                                                 surface_bvh_eval_,
+                                                                                 brush_pos_re_,
+                                                                                 brush_radius_re);
+    if (!brush_3d.has_value()) {
+      return;
+    }
+    const ReverseUVSampler reverse_uv_sampler_orig{surface_uv_map_orig_, surface_looptris_orig_};
+    for (const float4x4 &brush_transform : brush_transforms) {
+      self_->slide_info_.append_as();
+      SlideInfo &slide_info = self_->slide_info_.last();
+      slide_info.brush_transform = brush_transform;
+      this->find_curves_to_slide(brush_transform * brush_3d->position_cu,
+                                 brush_3d->radius_cu,
+                                 reverse_uv_sampler_orig,
+                                 slide_info.curves_to_slide);
+    }
+  }
 
-    self_->slide_info_.append({brush_transform});
-    Vector<SlideCurveInfo> &curves_to_slide = self_->slide_info_.last().curves_to_slide;
+  void find_curves_to_slide(const float3 &brush_pos_cu,
+                            const float brush_radius_cu,
+                            const ReverseUVSampler &reverse_uv_sampler_orig,
+                            Vector<SlideCurveInfo> &r_curves_to_slide)
+  {
+    const Span<float2> surface_uv_coords = curves_orig_->surface_uv_coords();
+    const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
-    /* Find curves in brush radius that should be moved. */
+    const Span<int> offsets = curves_orig_->offsets();
     for (const int curve_i : curve_selection_) {
-      const int first_point_i = curves_->offsets()[curve_i];
-      const float3 &first_pos_cu = brush_transform_inv * positions_cu[first_point_i];
-
-      float2 first_pos_re;
-      ED_view3d_project_float_v2_m4(ctx_.region, first_pos_cu, first_pos_re, projection.values);
-
-      const float dist_to_brush_sq_re = math::distance_squared(first_pos_re, brush_pos_re_);
-      if (dist_to_brush_sq_re > brush_radius_sq_re) {
+      const int first_point_i = offsets[curve_i];
+      const float3 old_pos_cu = self_->initial_deformed_positions_cu_[first_point_i];
+      const float dist_to_brush_sq_cu = math::distance_squared(old_pos_cu, brush_pos_cu);
+      if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
+        /* Root point is too far away from curve center. */
         continue;
       }
-      const float dist_to_brush_re = std::sqrt(dist_to_brush_sq_re);
+      const float dist_to_brush_cu = std::sqrt(dist_to_brush_sq_cu);
       const float radius_falloff = BKE_brush_curve_strength(
-          brush_, dist_to_brush_re, brush_radius_re);
-      curves_to_slide.append({curve_i, radius_falloff});
+          brush_, dist_to_brush_cu, brush_radius_cu);
+
+      const float2 uv = surface_uv_coords[curve_i];
+      ReverseUVSampler::Result result = reverse_uv_sampler_orig.sample(uv);
+      if (result.type != ReverseUVSampler::ResultType::Ok) {
+        /* The curve does not have a valid surface attachment. */
+        found_invalid_uv_mapping_.store(true);
+        continue;
+      }
+      /* Compute the normal at the initial surface position. */
+      const float3 normal_cu = math::normalize(
+          transforms_.surface_to_curves_normal *
+          geometry::compute_surface_point_normal(
+              *result.looptri, result.bary_weights, corner_normals_orig_su_));
+
+      r_curves_to_slide.append({curve_i, radius_falloff, normal_cu});
     }
   }
 
-  void slide_projected()
+  void slide_with_symmetry()
   {
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
-
-    MutableSpan<float2> surface_uv_coords;
-    if (!surface_uv_map_.is_empty()) {
-      surface_uv_coords = curves_->surface_uv_coords_for_write();
+    const ReverseUVSampler reverse_uv_sampler_orig{surface_uv_map_orig_, surface_looptris_orig_};
+    for (const SlideInfo &slide_info : self_->slide_info_) {
+      this->slide(slide_info.curves_to_slide, reverse_uv_sampler_orig, slide_info.brush_transform);
     }
+  }
 
-    float4x4 projection;
-    ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
+  void slide(const Span<SlideCurveInfo> slide_curves,
+             const ReverseUVSampler &reverse_uv_sampler_orig,
+             const float4x4 &brush_transform)
+  {
+    const float4x4 brush_transform_inv = brush_transform.inverted();
 
-    for (const SlideInfo &slide_info : self_->slide_info_) {
-      const float4x4 &brush_transform = slide_info.brush_transform;
-      const float4x4 brush_transform_inv = brush_transform.inverted();
-      const Span<SlideCurveInfo> curves_to_slide = slide_info.curves_to_slide;
-
-      threading::parallel_for(curves_to_slide.index_range(), 256, [&](const IndexRange range) {
-        for (const SlideCurveInfo &curve_slide_info : curves_to_slide.slice(range)) {
-          const int curve_i = curve_slide_info.curve_i;
-          const IndexRange points = curves_->points_for_curve(curve_i);
-          const int first_point_i = points.first();
-          const float3 old_first_pos_cu = brush_transform_inv * positions_cu[first_point_i];
-
-          float2 old_first_pos_re;
-          ED_view3d_project_float_v2_m4(
-              ctx_.region, old_first_pos_cu, old_first_pos_re, projection.values);
-          const float first_point_weight = brush_strength_ * curve_slide_info.radius_falloff;
-
-          /* Slide root position in region space and then project it back onto the surface. */
-          const float2 new_first_pos_re = old_first_pos_re +
-                                          first_point_weight * brush_pos_diff_re_;
-
-          float3 ray_start_wo, ray_end_wo;
-          ED_view3d_win_to_segment_clipped(ctx_.depsgraph,
-                                           ctx_.region,
-                                           ctx_.v3d,
-                                           new_first_pos_re,
-                                           ray_start_wo,
-                                           ray_end_wo,
-                                           true);
-          const float3 ray_start_su = transforms_.world_to_surface * ray_start_wo;
-          const float3 ray_end_su = transforms_.world_to_surface * ray_end_wo;
-
-          const float3 ray_direction_su = math::normalize(ray_end_su - ray_start_su);
-          BVHTreeRayHit hit;
-          hit.dist = FLT_MAX;
-          hit.index = -1;
-          BLI_bvhtree_ray_cast(surface_bvh_.tree,
-                               ray_start_su,
-                               ray_direction_su,
-                               0.0f,
-                               &hit,
-                               surface_bvh_.raycast_callback,
-                               &surface_bvh_);
-          if (hit.index == -1) {
-            continue;
-          }
+    const Span<MVert> verts_orig_su = surface_orig_->verts();
+    const Span<MLoop> loops_orig = surface_orig_->loops();
 
-          const int looptri_index = hit.index;
-          const float3 attached_pos_su = hit.co;
+    MutableSpan<float3> positions_orig_cu = curves_orig_->positions_for_write();
+    MutableSpan<float2> surface_uv_coords = curves_orig_->surface_uv_coords_for_write();
 
-          const float3 attached_pos_cu = transforms_.surface_to_curves * attached_pos_su;
-          const float3 pos_offset_cu = brush_transform * (attached_pos_cu - old_first_pos_cu);
+    float4x4 projection;
+    ED_view3d_ob_project_mat_get(ctx_.rv3d, curves_ob_orig_, projection.values);
+
+    const float2 brush_pos_diff_re = brush_pos_re_ - self_->initial_brush_pos_re_;
+
+    /* The brush transformation has to be applied in curves space. */
+    const float4x4 world_to_surface_with_symmetry_mat = transforms_.curves_to_surface *
+                                                        brush_transform *
+                                                        transforms_.world_to_curves;
+
+    threading::parallel_for(slide_curves.index_range(), 256, [&](const IndexRange range) {
+      for (const SlideCurveInfo &slide_curve_info : slide_curves.slice(range)) {
+        const int curve_i = slide_curve_info.curve_i;
+        const IndexRange points = curves_orig_->points_for_curve(curve_i);
+        const int first_point_i = points[0];
+
+        const float3 old_first_pos_eval_cu = self_->initial_deformed_positions_cu_[first_point_i];
+        const float3 old_first_symm_pos_eval_cu = brush_transform_inv * old_first_pos_eval_cu;
+        const float3 old_first_pos_eval_su = transforms_.curves_to_surface * old_first_pos_eval_cu;
+
+        float2 old_first_symm_pos_eval_re;
+        ED_view3d_project_float_v2_m4(ctx_.region,
+                                      old_first_symm_pos_eval_cu,
+                                      old_first_symm_pos_eval_re,
+                                      projection.values);
+
+        const float radius_falloff = slide_curve_info.radius_falloff;
+        const float curve_weight = brush_strength_ * radius_falloff * curve_factors_[curve_i];
+        const float2 new_first_symm_pos_eval_re = old_first_symm_pos_eval_re +
+                                                  curve_weight * brush_pos_diff_re;
+
+        /* Compute the ray that will be used to find the new position on the surface. */
+        float3 ray_start_wo, ray_end_wo;
+        ED_view3d_win_to_segment_clipped(ctx_.depsgraph,
+                                         ctx_.region,
+                                         ctx_.v3d,
+                                         new_first_symm_pos_eval_re,
+                                         ray_start_wo,
+                                         ray_end_wo,
+                                         true);
+        const float3 ray_start_su = world_to_surface_with_symmetry_mat * ray_start_wo;
+        const float3 ray_end_su = world_to_surface_with_symmetry_mat * ray_end_wo;
+        const float3 ray_direction_su = math::normalize(ray_end_su - ray_start_su);
+
+        /* Find the ray hit that is closest to the initial curve root position. */
+        int looptri_index_eval;
+        float3 hit_pos_eval_su;
+        if (!this->find_closest_ray_hit(ray_start_su,
+                                        ray_direction_su,
+                                        old_first_pos_eval_su,
+                                        looptri_index_eval,
+                                        hit_pos_eval_su)) {
+          continue;
+        }
 
-          /* Update positions. The first point doesn't have an additional weight here, because then
-           * it wouldn't be attached to the surface anymore. */
-          positions_cu[first_point_i] += pos_offset_cu;
-          for (const int point_i : points.drop_front(1)) {
-            const float weight = point_factors_[point_i];
-            positions_cu[point_i] += weight * pos_offset_cu;
-          }
+        /* Compute the uv of the new surface position on the evaluated mesh. */
+        const MLoopTri &looptri_eval = surface_looptris_eval_[looptri_index_eval];
+        const float3 bary_weights_eval = bke::mesh_surface_sample::compute_bary_coord_in_triangle(
+            surface_verts_eval_, surface_loops_eval_, looptri_eval, hit_pos_eval_su);
+        const float2 uv = attribute_math::mix3(bary_weights_eval,
+                                               surface_uv_map_eval_[looptri_eval.tri[0]],
+                                               surface_uv_map_eval_[looptri_eval.tri[1]],
+                                               surface_uv_map_eval_[looptri_eval.tri[2]]);
+
+        /* Try to find the same uv on the original surface. */
+        const ReverseUVSampler::Result result = reverse_uv_sampler_orig.sample(uv);
+        if (result.type != ReverseUVSampler::ResultType::Ok) {
+          found_invalid_uv_mapping_.store(true);
+          continue;
+        }
+        const MLoopTri &looptri_orig = *result.looptri;
+        const float3 &bary_weights_orig = result.bary_weights;
+
+        /* Gather old and new surface normal. */
+        const float3 &initial_normal_cu = slide_curve_info.initial_normal_cu;
+        const float3 new_normal_cu = math::normalize(
+            transforms_.surface_to_curves_normal *
+            geometry::compute_surface_point_normal(
+                *result.looptri, result.bary_weights, corner_normals_orig_su_));
+
+        /* Gather old and new surface position. */
+        const float3 old_first_pos_orig_cu = self_->initial_positions_cu_[first_point_i];
+        const float3 new_first_pos_orig_cu =
+            transforms_.surface_to_curves *
+            attribute_math::mix3<float3>(bary_weights_orig,
+                                         verts_orig_su[loops_orig[looptri_orig.tri[0]].v].co,
+                                         verts_orig_su[loops_orig[looptri_orig.tri[1]].v].co,
+                                         verts_orig_su[loops_orig[looptri_orig.tri[2]].v].co);
+
+        /* Actually transform curve points. */
+        const float4x4 slide_transform = this->get_slide_transform(
+            old_first_pos_orig_cu, new_first_pos_orig_cu, initial_normal_cu, new_normal_cu);
+        for (const int point_i : points) {
+          positions_orig_cu[point_i] = slide_transform * self_->initial_positions_cu_[point_i];
+        }
+        surface_uv_coords[curve_i] = uv;
+      }
+    });
+  }
 
-          /* Update surface attachment information if necessary. */
-          if (!surface_uv_map_.is_empty()) {
-            const MLoopTri &looptri = surface_looptris_[looptri_index];
-            const float3 bary_coord = bke::mesh_surface_sample::compute_bary_coord_in_triangle(
-                *surface_, looptri, attached_pos_su);
-            const float2 &uv0 = surface_uv_map_[looptri.tri[0]];
-            const float2 &uv1 = surface_uv_map_[looptri.tri[1]];
-            const float2 &uv2 = surface_uv_map_[looptri.tri[2]];
-            const float2 uv = attribute_math::mix3(bary_coord, uv0, uv1, uv2);
-            surface_uv_coords[curve_i] = uv;
+  bool find_closest_ray_hit(const float3 &ray_start_su,
+                            const float3 &ray_direction_su,
+                            const float3 &point_su,
+                            int &r_looptri_index,
+                            float3 &r_hit_pos)
+  {
+    float best_dist_sq_su = FLT_MAX;
+    int best_looptri_index_eval;
+    float3 best_hit_pos_su;
+    BLI_bvhtree_ray_cast_all_cpp(
+        *surface_bvh_eval_.tree,
+        ray_start_su,
+        ray_direction_su,
+        0.0f,
+        FLT_MAX,
+        [&](const int looptri_index, const BVHTreeRay &ray, BVHTreeRayHit &hit) {
+          surface_bvh_eval_.raycast_callback(&surface_bvh_eval_, looptri_index, &ray, &hit);
+          if (hit.index < 0) {
+            return;
           }
-        }
-      });
+          const float3 &hit_pos_su = hit.co;
+          const float dist_sq_su = math::distance_squared(hit_pos_su, point_su);
+          if (dist_sq_su < best_dist_sq_su) {
+            best_dist_sq_su = dist_sq_su;
+            best_hit_pos_su = hit_pos_su;
+            best_looptri_index_eval = hit.index;
+          }
+        });
+
+    if (best_dist_sq_su == FLT_MAX) {
+      return false;
     }
+    r_looptri_index = best_looptri_index_eval;
+    r_hit_pos = best_hit_pos_su;
+    return true;
+  }
+
+  float4x4 get_slide_transform(const float3 &old_root_pos,
+                               const float3 &new_root_pos,
+                               const float3 &old_normal,
+                               const float3 &new_normal)
+  {
+    float3x3 rotation_3x3;
+    rotation_between_vecs_to_mat3(rotation_3x3.values, old_normal, new_normal);
+    float4x4 rotation_4x4;
+    copy_m4_m3(rotation_4x4.values, rotation_3x3.values);
+
+    float4x4 transform = float4x4::identity();
+    sub_v3_v3(transform.values[3], old_root_pos);
+    mul_m4_m4_pre(transform.values, rotation_4x4.values);
+    add_v3_v3(transform.values[3], new_root_pos);
+    return transform;
   }
 };
 
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_smooth.cc b/source/blender/editors/sculpt_paint/curves_sculpt_smooth.cc
index f874a9fc255..37a7f1c83ed 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_smooth.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_smooth.cc
@@ -2,6 +2,7 @@
 
 #include "BKE_brush.h"
 #include "BKE_context.h"
+#include "BKE_crazyspace.hh"
 
 #include "ED_screen.h"
 #include "ED_view3d.h"
@@ -95,60 +96,56 @@ struct SmoothOperationExecutor {
       }
     }
 
+    Array<float> point_smooth_factors(curves_->points_num(), 0.0f);
+
     if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
-      this->smooth_projected_with_symmetry();
+      this->find_projected_smooth_factors_with_symmetry(point_smooth_factors);
     }
     else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
-      this->smooth_spherical_with_symmetry();
+      this->find_spherical_smooth_factors_with_symmetry(point_smooth_factors);
     }
     else {
       BLI_assert_unreachable();
     }
 
+    this->smooth(point_smooth_factors);
     curves_->tag_positions_changed();
     DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
     WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
     ED_region_tag_redraw(ctx_.region);
   }
 
-  void smooth_projected_with_symmetry()
+  void find_projected_smooth_factors_with_symmetry(MutableSpan<float> r_point_smooth_factors)
   {
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
         eCurvesSymmetryType(curves_id_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
-      this->smooth_projected(brush_transform);
+      this->find_projected_smooth_factors(brush_transform, r_point_smooth_factors);
     }
   }
 
-  void smooth_projected(const float4x4 &brush_transform)
+  void find_projected_smooth_factors(const float4x4 &brush_transform,
+                                     MutableSpan<float> r_point_smooth_factors)
   {
     const float4x4 brush_transform_inv = brush_transform.inverted();
 
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
     const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
 
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
-      Vector<float2> old_curve_positions_re;
       for (const int curve_i : curve_selection_.slice(range)) {
         const IndexRange points = curves_->points_for_curve(curve_i);
-
-        /* Find position of control points in screen space. */
-        old_curve_positions_re.clear();
-        old_curve_positions_re.reserve(points.size());
         for (const int point_i : points) {
-          const float3 &pos_cu = brush_transform_inv * positions_cu[point_i];
+          const float3 &pos_cu = brush_transform_inv * deformation.positions[point_i];
           float2 pos_re;
           ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, pos_re, projection.values);
-          old_curve_positions_re.append_unchecked(pos_re);
-        }
-        for (const int i : IndexRange(points.size()).drop_front(1).drop_back(1)) {
-          const int point_i = points[i];
-          const float2 &old_pos_re = old_curve_positions_re[i];
-          const float dist_to_brush_sq_re = math::distance_squared(old_pos_re, brush_pos_re_);
+          const float dist_to_brush_sq_re = math::distance_squared(pos_re, brush_pos_re_);
           if (dist_to_brush_sq_re > brush_radius_sq_re) {
             continue;
           }
@@ -161,27 +158,13 @@ struct SmoothOperationExecutor {
           const float weight_factor = 0.1f;
           const float weight = weight_factor * brush_strength_ * radius_falloff *
                                point_factors_[point_i];
-
-          /* Move points towards the middle of their neighbors. */
-          const float2 &old_pos_prev_re = old_curve_positions_re[i - 1];
-          const float2 &old_pos_next_re = old_curve_positions_re[i + 1];
-          const float2 goal_pos_re = math::midpoint(old_pos_prev_re, old_pos_next_re);
-          const float2 new_pos_re = math::interpolate(old_pos_re, goal_pos_re, weight);
-          const float3 old_pos_cu = brush_transform_inv * positions_cu[point_i];
-          float3 new_pos_wo;
-          ED_view3d_win_to_3d(ctx_.v3d,
-                              ctx_.region,
-                              transforms_.curves_to_world * old_pos_cu,
-                              new_pos_re,
-                              new_pos_wo);
-          const float3 new_pos_cu = brush_transform * (transforms_.world_to_curves * new_pos_wo);
-          positions_cu[point_i] = new_pos_cu;
+          math::max_inplace(r_point_smooth_factors[point_i], weight);
         }
       }
     });
   }
 
-  void smooth_spherical_with_symmetry()
+  void find_spherical_smooth_factors_with_symmetry(MutableSpan<float> r_point_smooth_factors)
   {
     float4x4 projection;
     ED_view3d_ob_project_mat_get(ctx_.rv3d, object_, projection.values);
@@ -198,27 +181,25 @@ struct SmoothOperationExecutor {
     const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
         eCurvesSymmetryType(curves_id_->symmetry));
     for (const float4x4 &brush_transform : symmetry_brush_transforms) {
-      this->smooth_spherical(brush_transform * brush_pos_cu, brush_radius_cu);
+      this->find_spherical_smooth_factors(
+          brush_transform * brush_pos_cu, brush_radius_cu, r_point_smooth_factors);
     }
   }
 
-  void smooth_spherical(const float3 &brush_pos_cu, const float brush_radius_cu)
+  void find_spherical_smooth_factors(const float3 &brush_pos_cu,
+                                     const float brush_radius_cu,
+                                     MutableSpan<float> r_point_smooth_factors)
   {
-    MutableSpan<float3> positions_cu = curves_->positions_for_write();
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
-      Vector<float3> old_curve_positions_cu;
       for (const int curve_i : curve_selection_.slice(range)) {
         const IndexRange points = curves_->points_for_curve(curve_i);
-        /* Remember original positions so that we don't smooth based on already smoothed points
-         * below. */
-        old_curve_positions_cu.clear();
-        old_curve_positions_cu.extend(positions_cu.slice(points));
-        for (const int i : IndexRange(points.size()).drop_front(1).drop_back(1)) {
-          const int point_i = points[i];
-          const float3 &old_pos_cu = old_curve_positions_cu[i];
-          const float dist_to_brush_sq_cu = math::distance_squared(old_pos_cu, brush_pos_cu);
+        for (const int point_i : points) {
+          const float3 &pos_cu = deformation.positions[point_i];
+          const float dist_to_brush_sq_cu = math::distance_squared(pos_cu, brush_pos_cu);
           if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
             continue;
           }
@@ -231,13 +212,34 @@ struct SmoothOperationExecutor {
           const float weight_factor = 0.1f;
           const float weight = weight_factor * brush_strength_ * radius_falloff *
                                point_factors_[point_i];
+          math::max_inplace(r_point_smooth_factors[point_i], weight);
+        }
+      }
+    });
+  }
 
-          /* Move points towards the middle of their neighbors. */
-          const float3 &old_pos_prev_cu = old_curve_positions_cu[i - 1];
-          const float3 &old_pos_next_cu = old_curve_positions_cu[i + 1];
-          const float3 goal_pos_cu = math::midpoint(old_pos_prev_cu, old_pos_next_cu);
-          const float3 new_pos_cu = math::interpolate(old_pos_cu, goal_pos_cu, weight);
-          positions_cu[point_i] = new_pos_cu;
+  void smooth(const Span<float> point_smooth_factors)
+  {
+    MutableSpan<float3> positions = curves_->positions_for_write();
+    threading::parallel_for(curve_selection_.index_range(), 256, [&](const IndexRange range) {
+      Vector<float3> old_positions;
+      for (const int curve_i : curve_selection_.slice(range)) {
+        const IndexRange points = curves_->points_for_curve(curve_i);
+        old_positions.clear();
+        old_positions.extend(positions.slice(points));
+        for (const int i : IndexRange(points.size()).drop_front(1).drop_back(1)) {
+          const int point_i = points[i];
+          const float smooth_factor = point_smooth_factors[point_i];
+          if (smooth_factor == 0.0f) {
+            continue;
+          }
+          /* Move towards the middle of the neighboring points. */
+          const float3 old_pos = old_positions[i];
+          const float3 &prev_pos = old_positions[i - 1];
+          const float3 &next_pos = old_positions[i + 1];
+          const float3 goal_pos = math::midpoint(prev_pos, next_pos);
+          const float3 new_pos = math::interpolate(old_pos, goal_pos, smooth_factor);
+          positions[point_i] = new_pos;
         }
       }
     });
diff --git a/source/blender/editors/sculpt_paint/curves_sculpt_snake_hook.cc b/source/blender/editors/sculpt_paint/curves_sculpt_snake_hook.cc
index ec0e8ff45e5..67757ce5f4a 100644
--- a/source/blender/editors/sculpt_paint/curves_sculpt_snake_hook.cc
+++ b/source/blender/editors/sculpt_paint/curves_sculpt_snake_hook.cc
@@ -176,6 +176,8 @@ struct SnakeHookOperatorExecutor {
   void projected_snake_hook(const float4x4 &brush_transform)
   {
     const float4x4 brush_transform_inv = brush_transform.inverted();
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
 
     MutableSpan<float3> positions_cu = curves_->positions_for_write();
 
@@ -186,15 +188,18 @@ struct SnakeHookOperatorExecutor {
     const float brush_radius_sq_re = pow2f(brush_radius_re);
 
     threading::parallel_for(curves_->curves_range(), 256, [&](const IndexRange curves_range) {
+      MoveAndResampleBuffers resample_buffer;
       for (const int curve_i : curves_range) {
         const IndexRange points = curves_->points_for_curve(curve_i);
         const int last_point_i = points.last();
-        const float3 old_pos_cu = brush_transform_inv * positions_cu[last_point_i];
+        const float3 old_pos_cu = deformation.positions[last_point_i];
+        const float3 old_symm_pos_cu = brush_transform_inv * old_pos_cu;
 
-        float2 old_pos_re;
-        ED_view3d_project_float_v2_m4(ctx_.region, old_pos_cu, old_pos_re, projection.values);
+        float2 old_symm_pos_re;
+        ED_view3d_project_float_v2_m4(
+            ctx_.region, old_symm_pos_cu, old_symm_pos_re, projection.values);
 
-        const float distance_to_brush_sq_re = math::distance_squared(old_pos_re,
+        const float distance_to_brush_sq_re = math::distance_squared(old_symm_pos_re,
                                                                      brush_pos_prev_re_);
         if (distance_to_brush_sq_re > brush_radius_sq_re) {
           continue;
@@ -204,17 +209,21 @@ struct SnakeHookOperatorExecutor {
             brush_, std::sqrt(distance_to_brush_sq_re), brush_radius_re);
         const float weight = brush_strength_ * radius_falloff * curve_factors_[curve_i];
 
-        const float2 new_position_re = old_pos_re + brush_pos_diff_re_ * weight;
-        float3 new_position_wo;
+        const float2 new_symm_pos_re = old_symm_pos_re + brush_pos_diff_re_ * weight;
+        float3 new_symm_pos_wo;
         ED_view3d_win_to_3d(ctx_.v3d,
                             ctx_.region,
-                            transforms_.curves_to_world * old_pos_cu,
-                            new_position_re,
-                            new_position_wo);
-        const float3 new_position_cu = brush_transform *
-                                       (transforms_.world_to_curves * new_position_wo);
-
-        move_last_point_and_resample(positions_cu.slice(points), new_position_cu);
+                            transforms_.curves_to_world * old_symm_pos_cu,
+                            new_symm_pos_re,
+                            new_symm_pos_wo);
+        const float3 new_pos_cu = brush_transform *
+                                  (transforms_.world_to_curves * new_symm_pos_wo);
+        const float3 translation_eval = new_pos_cu - old_pos_cu;
+        const float3 translation_orig = deformation.translation_from_deformed_to_original(
+            last_point_i, translation_eval);
+
+        const float3 last_point_cu = positions_cu[last_point_i] + translation_orig;
+        move_last_point_and_resample(resample_buffer, positions_cu.slice(points), last_point_cu);
       }
     });
   }
@@ -252,15 +261,19 @@ struct SnakeHookOperatorExecutor {
                             const float3 &brush_end_cu,
                             const float brush_radius_cu)
   {
+    const bke::crazyspace::GeometryDeformation deformation =
+        bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
+
     MutableSpan<float3> positions_cu = curves_->positions_for_write();
     const float3 brush_diff_cu = brush_end_cu - brush_start_cu;
     const float brush_radius_sq_cu = pow2f(brush_radius_cu);
 
     threading::parallel_for(curves_->curves_range(), 256, [&](const IndexRange curves_range) {
+      MoveAndResampleBuffers resample_buffer;
       for (const int curve_i : curves_range) {
         const IndexRange points = curves_->points_for_curve(curve_i);
         const int last_point_i = points.last();
-        const float3 old_pos_cu = positions_cu[last_point_i];
+        const float3 old_pos_cu = deformation.positions[last_point_i];
 
         const float distance_to_brush_sq_cu = dist_squared_to_line_segment_v3(
             old_pos_cu, brush_start_cu, brush_end_cu);
@@ -274,9 +287,12 @@ struct SnakeHookOperatorExecutor {
             brush_, distance_to_brush_cu, brush_radius_cu);
         const float weight = brush_strength_ * radius_falloff * curve_factors_[curve_i];
 
-        const float3 new_pos_cu = old_pos_cu + weight * brush_diff_cu;
+        const float3 translation_eval = weight * brush_diff_cu;
+        const float3 translation_orig = deformation.translation_from_deformed_to_original(
+            last_point_i, translation_eval);
 
-        move_last_point_and_resample(positions_cu.slice(points), new_pos_cu);
+        const float3 last_point_cu = positions_cu[last_point_i] + translation_orig;
+        move_last_point_and_resample(resample_buffer, positions_cu.slice(points), last_point_cu);
       }
     });
   }
diff --git a/source/blender/editors/sculpt_paint/paint_cursor.c b/source/blender/editors/sculpt_paint/paint_cursor.c
index c5ebcf870a3..164e13ac3c9 100644
--- a/source/blender/editors/sculpt_paint/paint_cursor.c
+++ b/source/blender/editors/sculpt_paint/paint_cursor.c
@@ -628,7 +628,7 @@ static bool paint_draw_tex_overlay(UnifiedPaintSettings *ups,
     /* Premultiplied alpha blending. */
     GPU_blend(GPU_BLEND_ALPHA_PREMULT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_IMAGE_COLOR);
 
     float final_color[4] = {1.0f, 1.0f, 1.0f, 1.0f};
     if (!col) {
@@ -720,7 +720,7 @@ static bool paint_draw_cursor_overlay(
 
     GPU_blend(GPU_BLEND_ALPHA_PREMULT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_IMAGE_COLOR);
 
     float final_color[4] = {UNPACK3(U.sculpt_paint_overlay_col), 1.0f};
     mul_v4_fl(final_color, brush->cursor_overlay_alpha * 0.01f);
@@ -915,7 +915,7 @@ static void paint_draw_curve_cursor(Brush *brush, ViewContext *vc)
     /* Draw the bezier handles and the curve segment between the current and next point. */
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     float selec_col[4], handle_col[4], pivot_col[4];
     UI_GetThemeColorType4fv(TH_VERTEX_SELECT, SPACE_VIEW3D, selec_col);
@@ -1145,11 +1145,10 @@ static void sculpt_geometry_preview_lines_draw(const uint gpuattr,
   }
 
   GPU_line_width(1.0f);
-  if (ss->preview_vert_index_count > 0) {
-    immBegin(GPU_PRIM_LINES, ss->preview_vert_index_count);
-    for (int i = 0; i < ss->preview_vert_index_count; i++) {
-      immVertex3fv(gpuattr,
-                   SCULPT_vertex_co_for_grab_active_get(ss, ss->preview_vert_index_list[i]));
+  if (ss->preview_vert_count > 0) {
+    immBegin(GPU_PRIM_LINES, ss->preview_vert_count);
+    for (int i = 0; i < ss->preview_vert_count; i++) {
+      immVertex3fv(gpuattr, SCULPT_vertex_co_for_grab_active_get(ss, ss->preview_vert_list[i]));
     }
     immEnd();
   }
@@ -1209,7 +1208,7 @@ typedef struct PaintCursorContext {
   /* Sculpt related data. */
   Sculpt *sd;
   SculptSession *ss;
-  int prev_active_vertex_index;
+  PBVHVertRef prev_active_vertex;
   bool is_stroke_active;
   bool is_cursor_over_mesh;
   bool is_multires;
@@ -1366,7 +1365,7 @@ static void paint_cursor_sculpt_session_update_and_init(PaintCursorContext *pcon
 
   /* This updates the active vertex, which is needed for most of the Sculpt/Vertex Colors tools to
    * work correctly */
-  pcontext->prev_active_vertex_index = ss->active_vertex_index;
+  pcontext->prev_active_vertex = ss->active_vertex;
   if (!ups->stroke_active) {
     pcontext->is_cursor_over_mesh = SCULPT_cursor_geometry_info_update(
         C, &gi, mval_fl, (pcontext->brush->falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE));
@@ -1549,7 +1548,7 @@ static void paint_cursor_preview_boundary_data_update(PaintCursorContext *pconte
   }
 
   ss->boundary_preview = SCULPT_boundary_data_init(
-      pcontext->vc.obact, pcontext->brush, ss->active_vertex_index, pcontext->radius);
+      pcontext->vc.obact, pcontext->brush, ss->active_vertex, pcontext->radius);
 }
 
 static void paint_cursor_draw_3d_view_brush_cursor_inactive(PaintCursorContext *pcontext)
@@ -1575,8 +1574,8 @@ static void paint_cursor_draw_3d_view_brush_cursor_inactive(PaintCursorContext *
 
   paint_cursor_update_object_space_radius(pcontext);
 
-  const bool update_previews = pcontext->prev_active_vertex_index !=
-                               SCULPT_active_vertex_get(pcontext->ss);
+  const bool update_previews = pcontext->prev_active_vertex.i !=
+                               SCULPT_active_vertex_get(pcontext->ss).i;
 
   /* Setup drawing. */
   wmViewport(&pcontext->region->winrct);
@@ -1870,7 +1869,7 @@ static void paint_cursor_setup_2D_drawing(PaintCursorContext *pcontext)
   GPU_line_smooth(true);
   pcontext->pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 }
 
 static void paint_cursor_setup_3D_drawing(PaintCursorContext *pcontext)
diff --git a/source/blender/editors/sculpt_paint/paint_hide.c b/source/blender/editors/sculpt_paint/paint_hide.c
index 944b3f953a0..9e435ee0748 100644
--- a/source/blender/editors/sculpt_paint/paint_hide.c
+++ b/source/blender/editors/sculpt_paint/paint_hide.c
@@ -78,6 +78,12 @@ static void partialvis_update_mesh(Object *ob,
   BKE_pbvh_node_get_verts(pbvh, node, &vert_indices, &mvert);
   paint_mask = CustomData_get_layer(&me->vdata, CD_PAINT_MASK);
 
+  bool *hide_vert = CustomData_get_layer_named(&me->vdata, CD_PROP_BOOL, ".hide_vert");
+  if (hide_vert == NULL) {
+    hide_vert = CustomData_add_layer_named(
+        &me->vdata, CD_PROP_BOOL, CD_SET_DEFAULT, NULL, me->totvert, ".hide_vert");
+  }
+
   SCULPT_undo_push_node(ob, node, SCULPT_UNDO_HIDDEN);
 
   for (i = 0; i < totvert; i++) {
@@ -86,16 +92,11 @@ static void partialvis_update_mesh(Object *ob,
 
     /* Hide vertex if in the hide volume. */
     if (is_effected(area, planes, v->co, vmask)) {
-      if (action == PARTIALVIS_HIDE) {
-        v->flag |= ME_HIDE;
-      }
-      else {
-        v->flag &= ~ME_HIDE;
-      }
+      hide_vert[vert_indices[i]] = (action == PARTIALVIS_HIDE);
       any_changed = true;
     }
 
-    if (!(v->flag & ME_HIDE)) {
+    if (!hide_vert[vert_indices[i]]) {
       any_visible = true;
     }
   }
@@ -350,10 +351,10 @@ static int hide_show_exec(bContext *C, wmOperator *op)
   /* Start undo. */
   switch (action) {
     case PARTIALVIS_HIDE:
-      SCULPT_undo_push_begin(ob, "Hide area");
+      SCULPT_undo_push_begin_ex(ob, "Hide area");
       break;
     case PARTIALVIS_SHOW:
-      SCULPT_undo_push_begin(ob, "Show area");
+      SCULPT_undo_push_begin_ex(ob, "Show area");
       break;
   }
 
@@ -382,10 +383,9 @@ static int hide_show_exec(bContext *C, wmOperator *op)
    * sculpt but it looks wrong when entering editmode otherwise). */
   if (pbvh_type == PBVH_FACES) {
     BKE_mesh_flush_hidden_from_verts(me);
+    BKE_pbvh_update_hide_attributes_from_mesh(pbvh);
   }
 
-  SCULPT_visibility_sync_all_vertex_to_face_sets(ob->sculpt);
-
   DEG_id_tag_update(&ob->id, ID_RECALC_SHADING);
   ED_region_tag_redraw(region);
 
diff --git a/source/blender/editors/sculpt_paint/paint_image.cc b/source/blender/editors/sculpt_paint/paint_image.cc
index 56cd4751881..c852fd25bc4 100644
--- a/source/blender/editors/sculpt_paint/paint_image.cc
+++ b/source/blender/editors/sculpt_paint/paint_image.cc
@@ -125,7 +125,7 @@ void ED_imapaint_dirty_region(
 
   imapaint_region_tiles(ibuf, x, y, w, h, &tilex, &tiley, &tilew, &tileh);
 
-  ListBase *undo_tiles = ED_image_paint_tile_list_get();
+  PaintTileMap *undo_tiles = ED_image_paint_tile_map_get();
 
   for (ty = tiley; ty <= tileh; ty++) {
     for (tx = tilex; tx <= tilew; tx++) {
@@ -158,11 +158,21 @@ void imapaint_image_update(
                                             imapaintpartial.dirty_region.xmax,
                                             imapaintpartial.dirty_region.ymax);
 
+  /* When buffer is partial updated the planes should be set to a larger value than 8. This will
+   * make sure that partial updating is working but uses more GPU memory as the gpu texture will
+   * have 4 channels. When so the whole texture needs to be reuploaded to the GPU using the new
+   * texture format. */
+  if (ibuf != nullptr && ibuf->planes == 8) {
+    ibuf->planes = 32;
+    BKE_image_partial_update_mark_full_update(image);
+    return;
+  }
+
   /* TODO: should set_tpage create ->rect? */
   if (texpaint || (sima && sima->lock)) {
     const int w = BLI_rcti_size_x(&imapaintpartial.dirty_region);
     const int h = BLI_rcti_size_y(&imapaintpartial.dirty_region);
-    /* Testing with partial update in uv editor too */
+    /* Testing with partial update in uv editor too. */
     BKE_image_update_gputexture(
         image, iuser, imapaintpartial.dirty_region.xmin, imapaintpartial.dirty_region.ymin, w, h);
   }
@@ -276,10 +286,11 @@ static bool image_paint_poll_ex(bContext *C, bool check_tool)
           (ID_IS_LINKED(sima->image) || ID_IS_OVERRIDE_LIBRARY(sima->image))) {
         return false;
       }
-      ARegion *region = CTX_wm_region(C);
-
-      if ((sima->mode == SI_MODE_PAINT) && region->regiontype == RGN_TYPE_WINDOW) {
-        return true;
+      if (sima->mode == SI_MODE_PAINT) {
+        const ARegion *region = CTX_wm_region(C);
+        if (region->regiontype == RGN_TYPE_WINDOW) {
+          return true;
+        }
       }
     }
   }
diff --git a/source/blender/editors/sculpt_paint/paint_image_2d.c b/source/blender/editors/sculpt_paint/paint_image_2d.c
index fae2e6863fa..5df65e596b9 100644
--- a/source/blender/editors/sculpt_paint/paint_image_2d.c
+++ b/source/blender/editors/sculpt_paint/paint_image_2d.c
@@ -1196,7 +1196,7 @@ static void paint_2d_do_making_brush(ImagePaintState *s,
   ImBuf tmpbuf;
   IMB_initImBuf(&tmpbuf, ED_IMAGE_UNDO_TILE_SIZE, ED_IMAGE_UNDO_TILE_SIZE, 32, 0);
 
-  ListBase *undo_tiles = ED_image_paint_tile_list_get();
+  PaintTileMap *undo_tiles = ED_image_paint_tile_map_get();
 
   for (int ty = tiley; ty <= tileh; ty++) {
     for (int tx = tilex; tx <= tilew; tx++) {
diff --git a/source/blender/editors/sculpt_paint/paint_image_ops_paint.cc b/source/blender/editors/sculpt_paint/paint_image_ops_paint.cc
index a671c24c514..5d50cdb4d1f 100644
--- a/source/blender/editors/sculpt_paint/paint_image_ops_paint.cc
+++ b/source/blender/editors/sculpt_paint/paint_image_ops_paint.cc
@@ -13,6 +13,7 @@
 
 #include "BKE_brush.h"
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_paint.h"
 #include "BKE_undo_system.h"
 
@@ -252,7 +253,7 @@ static void gradient_draw_line(bContext *UNUSED(C), int x, int y, void *customda
 
     ARegion *region = pop->vc.region;
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     GPU_line_width(4.0);
     immUniformColor4ub(0, 0, 0, 255);
@@ -293,7 +294,8 @@ static PaintOperation *texture_paint_init(bContext *C, wmOperator *op, const flo
   copy_v2_v2(pop->startmouse, mouse);
 
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   /* initialize from context */
   if (CTX_wm_region_view3d(C)) {
diff --git a/source/blender/editors/sculpt_paint/paint_image_proj.c b/source/blender/editors/sculpt_paint/paint_image_proj.c
index 50480b8aef0..946a59d0001 100644
--- a/source/blender/editors/sculpt_paint/paint_image_proj.c
+++ b/source/blender/editors/sculpt_paint/paint_image_proj.c
@@ -56,6 +56,7 @@
 #include "BKE_global.h"
 #include "BKE_idprop.h"
 #include "BKE_image.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_material.h"
@@ -414,6 +415,7 @@ typedef struct ProjPaintState {
   const float (*vert_normals)[3];
   const MEdge *medge_eval;
   const MPoly *mpoly_eval;
+  const int *material_indices;
   const MLoop *mloop_eval;
   const MLoopTri *mlooptri_eval;
 
@@ -542,8 +544,8 @@ static int project_paint_face_paint_tile(Image *ima, const float *uv)
 
 static TexPaintSlot *project_paint_face_paint_slot(const ProjPaintState *ps, int tri_index)
 {
-  const MPoly *mp = ps_tri_index_to_mpoly(ps, tri_index);
-  Material *ma = ps->mat_array[mp->mat_nr];
+  const int poly_i = ps->mlooptri_eval[tri_index].poly;
+  Material *ma = ps->mat_array[ps->material_indices == NULL ? 0 : ps->material_indices[poly_i]];
   return ma ? ma->texpaintslot + ma->paint_active_slot : NULL;
 }
 
@@ -553,23 +555,23 @@ static Image *project_paint_face_paint_image(const ProjPaintState *ps, int tri_i
     return ps->stencil_ima;
   }
 
-  const MPoly *mp = ps_tri_index_to_mpoly(ps, tri_index);
-  Material *ma = ps->mat_array[mp->mat_nr];
+  const int poly_i = ps->mlooptri_eval[tri_index].poly;
+  Material *ma = ps->mat_array[ps->material_indices == NULL ? 0 : ps->material_indices[poly_i]];
   TexPaintSlot *slot = ma ? ma->texpaintslot + ma->paint_active_slot : NULL;
   return slot ? slot->ima : ps->canvas_ima;
 }
 
 static TexPaintSlot *project_paint_face_clone_slot(const ProjPaintState *ps, int tri_index)
 {
-  const MPoly *mp = ps_tri_index_to_mpoly(ps, tri_index);
-  Material *ma = ps->mat_array[mp->mat_nr];
+  const int poly_i = ps->mlooptri_eval[tri_index].poly;
+  Material *ma = ps->mat_array[ps->material_indices == NULL ? 0 : ps->material_indices[poly_i]];
   return ma ? ma->texpaintslot + ma->paint_clone_slot : NULL;
 }
 
 static Image *project_paint_face_clone_image(const ProjPaintState *ps, int tri_index)
 {
-  const MPoly *mp = ps_tri_index_to_mpoly(ps, tri_index);
-  Material *ma = ps->mat_array[mp->mat_nr];
+  const int poly_i = ps->mlooptri_eval[tri_index].poly;
+  Material *ma = ps->mat_array[ps->material_indices == NULL ? 0 : ps->material_indices[poly_i]];
   TexPaintSlot *slot = ma ? ma->texpaintslot + ma->paint_clone_slot : NULL;
   return slot ? slot->ima : ps->clone_ima;
 }
@@ -1223,20 +1225,20 @@ static VertSeam *find_adjacent_seam(const ProjPaintState *ps,
   /* Circulate through the (sorted) vert seam array, in the direction of the seam normal,
    * until we find the first opposing seam, matching in UV space. */
   if (seam->normal_cw) {
-    LISTBASE_CIRCULAR_BACKWARD_BEGIN (vert_seams, adjacent, seam) {
+    LISTBASE_CIRCULAR_BACKWARD_BEGIN (VertSeam *, vert_seams, adjacent, seam) {
       if ((adjacent->normal_cw != seam->normal_cw) && cmp_uv(adjacent->uv, seam->uv)) {
         break;
       }
     }
-    LISTBASE_CIRCULAR_BACKWARD_END(vert_seams, adjacent, seam);
+    LISTBASE_CIRCULAR_BACKWARD_END(VertSeam *, vert_seams, adjacent, seam);
   }
   else {
-    LISTBASE_CIRCULAR_FORWARD_BEGIN (vert_seams, adjacent, seam) {
+    LISTBASE_CIRCULAR_FORWARD_BEGIN (VertSeam *, vert_seams, adjacent, seam) {
       if ((adjacent->normal_cw != seam->normal_cw) && cmp_uv(adjacent->uv, seam->uv)) {
         break;
       }
     }
-    LISTBASE_CIRCULAR_FORWARD_END(vert_seams, adjacent, seam);
+    LISTBASE_CIRCULAR_FORWARD_END(VertSeam *, vert_seams, adjacent, seam);
   }
 
   BLI_assert(adjacent);
@@ -1521,7 +1523,7 @@ static void project_face_seams_init(const ProjPaintState *ps,
 static void screen_px_from_ortho(const float uv[2],
                                  const float v1co[3],
                                  const float v2co[3],
-                                 const float v3co[3], /* Screenspace coords */
+                                 const float v3co[3], /* Screen-space coords */
                                  const float uv1co[2],
                                  const float uv2co[2],
                                  const float uv3co[2],
@@ -1813,7 +1815,7 @@ static int project_paint_undo_subtiles(const TileInfo *tinf, int tx, int ty)
   }
 
   if (generate_tile) {
-    ListBase *undo_tiles = ED_image_paint_tile_list_get();
+    struct PaintTileMap *undo_tiles = ED_image_paint_tile_map_get();
     volatile void *undorect;
     if (tinf->masked) {
       undorect = ED_image_paint_tile_push(undo_tiles,
@@ -4053,13 +4055,15 @@ static bool proj_paint_state_mesh_eval_init(const bContext *C, ProjPaintState *p
   }
   ps->mat_array[totmat - 1] = NULL;
 
-  ps->mvert_eval = ps->me_eval->mvert;
+  ps->mvert_eval = BKE_mesh_verts(ps->me_eval);
   ps->vert_normals = BKE_mesh_vertex_normals_ensure(ps->me_eval);
   if (ps->do_mask_cavity) {
-    ps->medge_eval = ps->me_eval->medge;
+    ps->medge_eval = BKE_mesh_edges(ps->me_eval);
   }
-  ps->mloop_eval = ps->me_eval->mloop;
-  ps->mpoly_eval = ps->me_eval->mpoly;
+  ps->mloop_eval = BKE_mesh_loops(ps->me_eval);
+  ps->mpoly_eval = BKE_mesh_polys(ps->me_eval);
+  ps->material_indices = (const int *)CustomData_get_layer_named(
+      &ps->me_eval->pdata, CD_PROP_INT32, "material_index");
 
   ps->totvert_eval = ps->me_eval->totvert;
   ps->totedge_eval = ps->me_eval->totedge;
@@ -4151,7 +4155,7 @@ static void proj_paint_face_lookup_init(const ProjPaintState *ps, ProjPaintFaceL
   memset(face_lookup, 0, sizeof(*face_lookup));
   if (ps->do_face_sel) {
     face_lookup->index_mp_to_orig = CustomData_get_layer(&ps->me_eval->pdata, CD_ORIGINDEX);
-    face_lookup->mpoly_orig = ((Mesh *)ps->ob->data)->mpoly;
+    face_lookup->mpoly_orig = BKE_mesh_polys((Mesh *)ps->ob->data);
   }
 }
 
@@ -6038,7 +6042,8 @@ static int texture_paint_camera_project_exec(bContext *C, wmOperator *op)
   int orig_brush_size;
   IDProperty *idgroup;
   IDProperty *view_data = NULL;
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   bool uvs, mat, tex;
 
   if (ob == NULL || ob->type != OB_MESH) {
diff --git a/source/blender/editors/sculpt_paint/paint_intern.h b/source/blender/editors/sculpt_paint/paint_intern.h
index ea17114efa5..99c25953d50 100644
--- a/source/blender/editors/sculpt_paint/paint_intern.h
+++ b/source/blender/editors/sculpt_paint/paint_intern.h
@@ -46,7 +46,10 @@ typedef struct CoNo {
 
 /* paint_stroke.c */
 
-typedef bool (*StrokeGetLocation)(struct bContext *C, float location[3], const float mouse[2]);
+typedef bool (*StrokeGetLocation)(struct bContext *C,
+                                  float location[3],
+                                  const float mouse[2],
+                                  bool force_original);
 typedef bool (*StrokeTestStart)(struct bContext *C, struct wmOperator *op, const float mouse[2]);
 typedef void (*StrokeUpdateStep)(struct bContext *C,
                                  struct wmOperator *op,
@@ -370,10 +373,12 @@ void PAINT_OT_face_select_linked(struct wmOperatorType *ot);
 void PAINT_OT_face_select_linked_pick(struct wmOperatorType *ot);
 void PAINT_OT_face_select_all(struct wmOperatorType *ot);
 void PAINT_OT_face_select_hide(struct wmOperatorType *ot);
-void PAINT_OT_face_select_reveal(struct wmOperatorType *ot);
+
+void PAINT_OT_face_vert_reveal(struct wmOperatorType *ot);
 
 void PAINT_OT_vert_select_all(struct wmOperatorType *ot);
 void PAINT_OT_vert_select_ungrouped(struct wmOperatorType *ot);
+void PAINT_OT_vert_select_hide(struct wmOperatorType *ot);
 
 bool vert_paint_poll(struct bContext *C);
 bool mask_paint_poll(struct bContext *C);
diff --git a/source/blender/editors/sculpt_paint/paint_mask.c b/source/blender/editors/sculpt_paint/paint_mask.c
index 89bbf2a3c92..437ff7506ba 100644
--- a/source/blender/editors/sculpt_paint/paint_mask.c
+++ b/source/blender/editors/sculpt_paint/paint_mask.c
@@ -134,6 +134,7 @@ static void mask_flood_fill_task_cb(void *__restrict userdata,
 
 static int mask_flood_fill_exec(bContext *C, wmOperator *op)
 {
+  const Scene *scene = CTX_data_scene(C);
   Object *ob = CTX_data_active_object(C);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   PaintMaskFloodMode mode;
@@ -146,13 +147,16 @@ static int mask_flood_fill_exec(bContext *C, wmOperator *op)
   mode = RNA_enum_get(op->ptr, "mode");
   value = RNA_float_get(op->ptr, "value");
 
+  MultiresModifierData *mmd = BKE_sculpt_multires_active(scene, ob);
+  BKE_sculpt_mask_layers_ensure(ob, mmd);
+
   BKE_sculpt_update_object_for_edit(depsgraph, ob, false, true, false);
   pbvh = ob->sculpt->pbvh;
   multires = (BKE_pbvh_type(pbvh) == PBVH_GRIDS);
 
   BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
 
-  SCULPT_undo_push_begin(ob, "Mask flood fill");
+  SCULPT_undo_push_begin(ob, op);
 
   MaskTaskData data = {
       .ob = ob,
@@ -663,7 +667,7 @@ static bool sculpt_gesture_is_effected_lasso(SculptGestureContext *sgcontext, co
 static bool sculpt_gesture_is_vertex_effected(SculptGestureContext *sgcontext, PBVHVertexIter *vd)
 {
   float vertex_normal[3];
-  SCULPT_vertex_normal_get(sgcontext->ss, vd->index, vertex_normal);
+  SCULPT_vertex_normal_get(sgcontext->ss, vd->vertex, vertex_normal);
   float dot = dot_v3v3(sgcontext->view_normal, vertex_normal);
   const bool is_effected_front_face = !(sgcontext->front_faces_only && dot < 0.0f);
 
@@ -687,10 +691,10 @@ static bool sculpt_gesture_is_vertex_effected(SculptGestureContext *sgcontext, P
   return false;
 }
 
-static void sculpt_gesture_apply(bContext *C, SculptGestureContext *sgcontext)
+static void sculpt_gesture_apply(bContext *C, SculptGestureContext *sgcontext, wmOperator *op)
 {
   SculptGestureOperation *operation = sgcontext->operation;
-  SCULPT_undo_push_begin(CTX_data_active_object(C), "Sculpt Gesture Apply");
+  SCULPT_undo_push_begin(CTX_data_active_object(C), op);
 
   operation->sculpt_gesture_begin(C, sgcontext);
 
@@ -743,7 +747,7 @@ static void face_set_gesture_apply_task_cb(void *__restrict userdata,
 
   BKE_pbvh_vertex_iter_begin (sgcontext->ss->pbvh, node, vd, PBVH_ITER_UNIQUE) {
     if (sculpt_gesture_is_vertex_effected(sgcontext, &vd)) {
-      SCULPT_vertex_face_set_set(sgcontext->ss, vd.index, face_set_operation->new_face_set_id);
+      SCULPT_vertex_face_set_set(sgcontext->ss, vd.vertex, face_set_operation->new_face_set_id);
       any_updated = true;
     }
   }
@@ -774,6 +778,8 @@ static void sculpt_gesture_init_face_set_properties(SculptGestureContext *sgcont
   struct Mesh *mesh = BKE_mesh_from_object(sgcontext->vc.obact);
   sgcontext->operation = MEM_callocN(sizeof(SculptGestureFaceSetOperation), "Face Set Operation");
 
+  sgcontext->ss->face_sets = BKE_sculpt_face_sets_ensure(mesh);
+
   SculptGestureFaceSetOperation *face_set_operation = (SculptGestureFaceSetOperation *)
                                                           sgcontext->operation;
 
@@ -817,7 +823,7 @@ static void mask_gesture_apply_task_cb(void *__restrict userdata,
 
   BKE_pbvh_vertex_iter_begin (sgcontext->ss->pbvh, node, vd, PBVH_ITER_UNIQUE) {
     if (sculpt_gesture_is_vertex_effected(sgcontext, &vd)) {
-      float prevmask = *vd.mask;
+      float prevmask = vd.mask ? *vd.mask : 0.0f;
       if (!any_masked) {
         any_masked = true;
 
@@ -863,6 +869,10 @@ static void sculpt_gesture_init_mask_properties(SculptGestureContext *sgcontext,
 
   SculptGestureMaskOperation *mask_operation = (SculptGestureMaskOperation *)sgcontext->operation;
 
+  Object *object = sgcontext->vc.obact;
+  MultiresModifierData *mmd = BKE_sculpt_multires_active(sgcontext->vc.scene, object);
+  BKE_sculpt_mask_layers_ensure(sgcontext->vc.obact, mmd);
+
   mask_operation->op.sculpt_gesture_begin = sculpt_gesture_mask_begin;
   mask_operation->op.sculpt_gesture_apply_for_symmetry_pass =
       sculpt_gesture_mask_apply_for_symmetry_pass;
@@ -1025,7 +1035,9 @@ static void sculpt_gesture_trim_calculate_depth(SculptGestureContext *sgcontext)
   trim_operation->depth_back = -FLT_MAX;
 
   for (int i = 0; i < totvert; i++) {
-    const float *vco = SCULPT_vertex_co_get(ss, i);
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    const float *vco = SCULPT_vertex_co_get(ss, vertex);
     /* Convert the coordinates to world space to calculate the depth. When generating the trimming
      * mesh, coordinates are first calculated in world space, then converted to object space to
      * store them. */
@@ -1121,6 +1133,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
   const float(*ob_imat)[4] = vc->obact->imat;
 
   /* Write vertices coordinates for the front face. */
+  MVert *verts = BKE_mesh_verts_for_write(trim_operation->mesh);
   float depth_point[3];
   madd_v3_v3v3fl(depth_point, shape_origin, shape_normal, depth_front);
   for (int i = 0; i < tot_screen_points; i++) {
@@ -1132,7 +1145,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
       ED_view3d_win_to_3d_on_plane(region, shape_plane, screen_points[i], false, new_point);
       madd_v3_v3fl(new_point, shape_normal, depth_front);
     }
-    mul_v3_m4v3(trim_operation->mesh->mvert[i].co, ob_imat, new_point);
+    mul_v3_m4v3(verts[i].co, ob_imat, new_point);
     mul_v3_m4v3(trim_operation->true_mesh_co[i], ob_imat, new_point);
   }
 
@@ -1147,7 +1160,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
       ED_view3d_win_to_3d_on_plane(region, shape_plane, screen_points[i], false, new_point);
       madd_v3_v3fl(new_point, shape_normal, depth_back);
     }
-    mul_v3_m4v3(trim_operation->mesh->mvert[i + tot_screen_points].co, ob_imat, new_point);
+    mul_v3_m4v3(verts[i + tot_screen_points].co, ob_imat, new_point);
     mul_v3_m4v3(trim_operation->true_mesh_co[i + tot_screen_points], ob_imat, new_point);
   }
 
@@ -1157,10 +1170,12 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
   BLI_polyfill_calc(screen_points, tot_screen_points, 0, r_tris);
 
   /* Write the front face triangle indices. */
-  MPoly *mp = trim_operation->mesh->mpoly;
-  MLoop *ml = trim_operation->mesh->mloop;
+  MPoly *polys = BKE_mesh_polys_for_write(trim_operation->mesh);
+  MLoop *loops = BKE_mesh_loops_for_write(trim_operation->mesh);
+  MPoly *mp = polys;
+  MLoop *ml = loops;
   for (int i = 0; i < tot_tris_face; i++, mp++, ml += 3) {
-    mp->loopstart = (int)(ml - trim_operation->mesh->mloop);
+    mp->loopstart = (int)(ml - loops);
     mp->totloop = 3;
     ml[0].v = r_tris[i][0];
     ml[1].v = r_tris[i][1];
@@ -1169,7 +1184,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
 
   /* Write the back face triangle indices. */
   for (int i = 0; i < tot_tris_face; i++, mp++, ml += 3) {
-    mp->loopstart = (int)(ml - trim_operation->mesh->mloop);
+    mp->loopstart = (int)(ml - loops);
     mp->totloop = 3;
     ml[0].v = r_tris[i][0] + tot_screen_points;
     ml[1].v = r_tris[i][1] + tot_screen_points;
@@ -1180,7 +1195,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
 
   /* Write the indices for the lateral triangles. */
   for (int i = 0; i < tot_screen_points; i++, mp++, ml += 3) {
-    mp->loopstart = (int)(ml - trim_operation->mesh->mloop);
+    mp->loopstart = (int)(ml - loops);
     mp->totloop = 3;
     int current_index = i;
     int next_index = current_index + 1;
@@ -1193,7 +1208,7 @@ static void sculpt_gesture_trim_geometry_generate(SculptGestureContext *sgcontex
   }
 
   for (int i = 0; i < tot_screen_points; i++, mp++, ml += 3) {
-    mp->loopstart = (int)(ml - trim_operation->mesh->mloop);
+    mp->loopstart = (int)(ml - loops);
     mp->totloop = 3;
     int current_index = i;
     int next_index = current_index + 1;
@@ -1310,8 +1325,7 @@ static void sculpt_gesture_apply_trim(SculptGestureContext *sgcontext)
                                             }),
                                             sculpt_mesh);
   BM_mesh_free(bm);
-  BKE_mesh_nomain_to_mesh(
-      result, sgcontext->vc.obact->data, sgcontext->vc.obact, &CD_MASK_MESH, true);
+  BKE_mesh_nomain_to_mesh(result, sgcontext->vc.obact->data, sgcontext->vc.obact);
 }
 
 static void sculpt_gesture_trim_begin(bContext *C, SculptGestureContext *sgcontext)
@@ -1328,8 +1342,9 @@ static void sculpt_gesture_trim_apply_for_symmetry_pass(bContext *UNUSED(C),
 {
   SculptGestureTrimOperation *trim_operation = (SculptGestureTrimOperation *)sgcontext->operation;
   Mesh *trim_mesh = trim_operation->mesh;
+  MVert *verts = BKE_mesh_verts_for_write(trim_mesh);
   for (int i = 0; i < trim_mesh->totvert; i++) {
-    flip_v3_v3(trim_mesh->mvert[i].co, trim_operation->true_mesh_co[i], sgcontext->symmpass);
+    flip_v3_v3(verts[i].co, trim_operation->true_mesh_co[i], sgcontext->symmpass);
   }
   sculpt_gesture_trim_normals_update(sgcontext);
   sculpt_gesture_apply_trim(sgcontext);
@@ -1437,7 +1452,7 @@ static void project_line_gesture_apply_task_cb(void *__restrict userdata,
     }
     add_v3_v3(vd.co, disp);
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(sgcontext->ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(sgcontext->ss->pbvh, vd.vertex);
     }
     any_updated = true;
   }
@@ -1500,7 +1515,7 @@ static int paint_mask_gesture_box_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_mask_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1512,7 +1527,7 @@ static int paint_mask_gesture_lasso_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_mask_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1524,7 +1539,7 @@ static int paint_mask_gesture_line_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_mask_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1536,7 +1551,7 @@ static int face_set_gesture_box_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_face_set_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1548,7 +1563,7 @@ static int face_set_gesture_lasso_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_face_set_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1573,7 +1588,7 @@ static int sculpt_trim_gesture_box_exec(bContext *C, wmOperator *op)
   }
 
   sculpt_gesture_init_trim_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1614,7 +1629,7 @@ static int sculpt_trim_gesture_lasso_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_trim_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
@@ -1643,7 +1658,7 @@ static int project_gesture_line_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
   sculpt_gesture_init_project_properties(sgcontext, op);
-  sculpt_gesture_apply(C, sgcontext);
+  sculpt_gesture_apply(C, sgcontext, op);
   sculpt_gesture_context_free(sgcontext);
   return OPERATOR_FINISHED;
 }
diff --git a/source/blender/editors/sculpt_paint/paint_ops.c b/source/blender/editors/sculpt_paint/paint_ops.c
index ce6b397af15..b78c60e7964 100644
--- a/source/blender/editors/sculpt_paint/paint_ops.c
+++ b/source/blender/editors/sculpt_paint/paint_ops.c
@@ -361,7 +361,6 @@ static int palette_color_add_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Scene *scene = CTX_data_scene(C);
   Paint *paint = BKE_paint_get_active_from_context(C);
-  Brush *brush = paint->brush;
   ePaintMode mode = BKE_paintmode_get_active_from_context(C);
   Palette *palette = paint->palette;
   PaletteColor *color;
@@ -369,17 +368,20 @@ static int palette_color_add_exec(bContext *C, wmOperator *UNUSED(op))
   color = BKE_palette_color_add(palette);
   palette->active_color = BLI_listbase_count(&palette->colors) - 1;
 
-  if (ELEM(mode,
-           PAINT_MODE_TEXTURE_3D,
-           PAINT_MODE_TEXTURE_2D,
-           PAINT_MODE_VERTEX,
-           PAINT_MODE_SCULPT)) {
-    copy_v3_v3(color->rgb, BKE_brush_color_get(scene, brush));
-    color->value = 0.0;
-  }
-  else if (mode == PAINT_MODE_WEIGHT) {
-    zero_v3(color->rgb);
-    color->value = brush->weight;
+  if (paint->brush) {
+    const Brush *brush = paint->brush;
+    if (ELEM(mode,
+             PAINT_MODE_TEXTURE_3D,
+             PAINT_MODE_TEXTURE_2D,
+             PAINT_MODE_VERTEX,
+             PAINT_MODE_SCULPT)) {
+      copy_v3_v3(color->rgb, BKE_brush_color_get(scene, brush));
+      color->value = 0.0;
+    }
+    else if (mode == PAINT_MODE_WEIGHT) {
+      zero_v3(color->rgb);
+      color->value = brush->weight;
+    }
   }
 
   return OPERATOR_FINISHED;
@@ -1454,6 +1456,7 @@ void ED_operatortypes_paint(void)
   /* vertex selection */
   WM_operatortype_append(PAINT_OT_vert_select_all);
   WM_operatortype_append(PAINT_OT_vert_select_ungrouped);
+  WM_operatortype_append(PAINT_OT_vert_select_hide);
 
   /* vertex */
   WM_operatortype_append(PAINT_OT_vertex_paint_toggle);
@@ -1472,7 +1475,8 @@ void ED_operatortypes_paint(void)
   WM_operatortype_append(PAINT_OT_face_select_linked_pick);
   WM_operatortype_append(PAINT_OT_face_select_all);
   WM_operatortype_append(PAINT_OT_face_select_hide);
-  WM_operatortype_append(PAINT_OT_face_select_reveal);
+
+  WM_operatortype_append(PAINT_OT_face_vert_reveal);
 
   /* partial visibility */
   WM_operatortype_append(PAINT_OT_hide_show);
diff --git a/source/blender/editors/sculpt_paint/paint_stroke.c b/source/blender/editors/sculpt_paint/paint_stroke.c
index 1ee26935dc9..73d52febfc6 100644
--- a/source/blender/editors/sculpt_paint/paint_stroke.c
+++ b/source/blender/editors/sculpt_paint/paint_stroke.c
@@ -79,6 +79,8 @@ typedef struct PaintStroke {
 
   float last_mouse_position[2];
   float last_world_space_position[3];
+  float last_scene_spacing_delta[3];
+
   bool stroke_over_mesh;
   /* space distance covered so far */
   float stroke_distance;
@@ -120,6 +122,8 @@ typedef struct PaintStroke {
   StrokeUpdateStep update_step;
   StrokeRedraw redraw;
   StrokeDone done;
+
+  bool original; /* Ray-cast original mesh at start of stroke. */
 } PaintStroke;
 
 /*** Cursors ***/
@@ -136,7 +140,7 @@ static void paint_draw_smooth_cursor(bContext *C, int x, int y, void *customdata
     ARegion *region = stroke->vc.region;
 
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4ubv(paint->paint_cursor_col);
 
     immBegin(GPU_PRIM_LINES, 2);
@@ -164,7 +168,7 @@ static void paint_draw_line_cursor(bContext *C, int x, int y, void *customdata)
   uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -243,6 +247,11 @@ static bool paint_stroke_use_scene_spacing(Brush *brush, ePaintMode mode)
   return false;
 }
 
+static bool paint_tool_raycast_original(Brush *brush, ePaintMode UNUSED(mode))
+{
+  return brush->flag & BRUSH_ANCHORED;
+}
+
 static bool paint_tool_require_inbetween_mouse_events(Brush *brush, ePaintMode mode)
 {
   if (brush->flag & BRUSH_ANCHORED) {
@@ -392,7 +401,7 @@ static bool paint_brush_update(bContext *C,
       halfway[1] = dy * 0.5f + stroke->initial_mouse[1];
 
       if (stroke->get_location) {
-        if (stroke->get_location(C, r_location, halfway)) {
+        if (stroke->get_location(C, r_location, halfway, stroke->original)) {
           hit = true;
           location_sampled = true;
           location_success = true;
@@ -466,7 +475,7 @@ static bool paint_brush_update(bContext *C,
 
   if (!location_sampled) {
     if (stroke->get_location) {
-      if (stroke->get_location(C, r_location, mouse)) {
+      if (stroke->get_location(C, r_location, mouse, stroke->original)) {
         location_success = true;
         *r_location_is_set = true;
       }
@@ -550,8 +559,16 @@ static void paint_brush_stroke_add_step(
   stroke->last_pressure = pressure;
 
   if (paint_stroke_use_scene_spacing(brush, mode)) {
-    SCULPT_stroke_get_location(C, stroke->last_world_space_position, stroke->last_mouse_position);
-    mul_m4_v3(stroke->vc.obact->obmat, stroke->last_world_space_position);
+    float world_space_position[3];
+
+    if (SCULPT_stroke_get_location(
+            C, world_space_position, stroke->last_mouse_position, stroke->original)) {
+      copy_v3_v3(stroke->last_world_space_position, world_space_position);
+      mul_m4_v3(stroke->vc.obact->obmat, stroke->last_world_space_position);
+    }
+    else {
+      add_v3_v3(stroke->last_world_space_position, stroke->last_scene_spacing_delta);
+    }
   }
 
   if (paint_stroke_use_jitter(mode, brush, stroke->stroke_mode == BRUSH_STROKE_INVERT)) {
@@ -698,7 +715,7 @@ static float paint_space_stroke_spacing(bContext *C,
   spacing *= stroke->zoom_2d;
 
   if (paint_stroke_use_scene_spacing(brush, mode)) {
-    return max_ff(0.001f, size_clamp * spacing / 50.0f);
+    return size_clamp * spacing / 50.0f;
   }
   return max_ff(stroke->zoom_2d, size_clamp * spacing / 50.0f);
 }
@@ -807,7 +824,7 @@ static int paint_space_stroke(bContext *C,
 
   if (use_scene_spacing) {
     float world_space_position[3];
-    bool hit = SCULPT_stroke_get_location(C, world_space_position, final_mouse);
+    bool hit = SCULPT_stroke_get_location(C, world_space_position, final_mouse, stroke->original);
     mul_m4_v3(stroke->vc.obact->obmat, world_space_position);
     if (hit && stroke->stroke_over_mesh) {
       sub_v3_v3v3(d_world_space_position, world_space_position, stroke->last_world_space_position);
@@ -838,6 +855,8 @@ static int paint_space_stroke(bContext *C,
                     stroke->last_world_space_position,
                     final_world_space_position);
         ED_view3d_project_v2(region, final_world_space_position, mouse);
+
+        mul_v3_v3fl(stroke->last_scene_spacing_delta, d_world_space_position, spacing);
       }
       else {
         mouse[0] = stroke->last_mouse_position[0] + dmouse[0] * spacing;
@@ -896,6 +915,8 @@ PaintStroke *paint_stroke_new(bContext *C,
   stroke->ups = ups;
   stroke->stroke_mode = RNA_enum_get(op->ptr, "mode");
 
+  stroke->original = paint_tool_raycast_original(br, BKE_paintmode_get_active_from_context(C));
+
   get_imapaint_zoom(C, &zoomx, &zoomy);
   stroke->zoom_2d = max_ff(zoomx, zoomy);
 
@@ -1119,7 +1140,7 @@ struct wmKeyMap *paint_stroke_modal_keymap(struct wmKeyConfig *keyconf)
 
   struct wmKeyMap *keymap = WM_modalkeymap_find(keyconf, name);
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (!keymap) {
     keymap = WM_modalkeymap_ensure(keyconf, name, modal_items);
   }
@@ -1191,8 +1212,10 @@ static void paint_line_strokes_spacing(bContext *C,
   copy_v2_v2(stroke->last_mouse_position, old_pos);
 
   if (use_scene_spacing) {
-    bool hit_old = SCULPT_stroke_get_location(C, world_space_position_old, old_pos);
-    bool hit_new = SCULPT_stroke_get_location(C, world_space_position_new, new_pos);
+    bool hit_old = SCULPT_stroke_get_location(
+        C, world_space_position_old, old_pos, stroke->original);
+    bool hit_new = SCULPT_stroke_get_location(
+        C, world_space_position_new, new_pos, stroke->original);
     mul_m4_v3(stroke->vc.obact->obmat, world_space_position_old);
     mul_m4_v3(stroke->vc.obact->obmat, world_space_position_new);
     if (hit_old && hit_new && stroke->stroke_over_mesh) {
@@ -1336,7 +1359,7 @@ static bool paint_stroke_curve_end(bContext *C, wmOperator *op, PaintStroke *str
 
           if (paint_stroke_use_scene_spacing(br, BKE_paintmode_get_active_from_context(C))) {
             stroke->stroke_over_mesh = SCULPT_stroke_get_location(
-                C, stroke->last_world_space_position, data + 2 * j);
+                C, stroke->last_world_space_position, data + 2 * j, stroke->original);
             mul_m4_v3(stroke->vc.obact->obmat, stroke->last_world_space_position);
           }
 
@@ -1468,7 +1491,7 @@ int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event, PaintS
     copy_v2_v2(stroke->last_mouse_position, sample_average.mouse);
     if (paint_stroke_use_scene_spacing(br, mode)) {
       stroke->stroke_over_mesh = SCULPT_stroke_get_location(
-          C, stroke->last_world_space_position, sample_average.mouse);
+          C, stroke->last_world_space_position, sample_average.mouse, stroke->original);
       mul_m4_v3(stroke->vc.obact->obmat, stroke->last_world_space_position);
     }
     stroke->stroke_started = stroke->test_start(C, op, sample_average.mouse);
@@ -1527,8 +1550,7 @@ int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event, PaintS
     copy_v2_fl2(mouse, event->mval[0], event->mval[1]);
     paint_stroke_line_constrain(stroke, mouse);
 
-    if (stroke->stroke_started &&
-        (first_modal || (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)))) {
+    if (stroke->stroke_started && (first_modal || ISMOUSE_MOTION(event->type))) {
       if ((br->mtex.brush_angle_mode & MTEX_ANGLE_RAKE) ||
           (br->mask_mtex.brush_angle_mode & MTEX_ANGLE_RAKE)) {
         copy_v2_v2(stroke->ups->last_rake, stroke->last_mouse_position);
@@ -1538,7 +1560,7 @@ int paint_stroke_modal(bContext *C, wmOperator *op, const wmEvent *event, PaintS
   }
   else if (first_modal ||
            /* regular dabs */
-           (!(br->flag & BRUSH_AIRBRUSH) && (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE))) ||
+           (!(br->flag & BRUSH_AIRBRUSH) && ISMOUSE_MOTION(event->type)) ||
            /* airbrush */
            ((br->flag & BRUSH_AIRBRUSH) && event->type == TIMER &&
             event->customdata == stroke->timer)) {
diff --git a/source/blender/editors/sculpt_paint/paint_utils.c b/source/blender/editors/sculpt_paint/paint_utils.c
index 3f26f590b70..cb981a3bfb1 100644
--- a/source/blender/editors/sculpt_paint/paint_utils.c
+++ b/source/blender/editors/sculpt_paint/paint_utils.c
@@ -28,7 +28,9 @@
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_image.h"
+#include "BKE_layer.h"
 #include "BKE_material.h"
+#include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_paint.h"
 #include "BKE_report.h"
@@ -286,9 +288,8 @@ static void imapaint_pick_uv(
   const MLoopTri *lt = BKE_mesh_runtime_looptri_ensure(me_eval);
   const int tottri = me_eval->runtime.looptris.len;
 
-  const MVert *mvert = me_eval->mvert;
-  const MPoly *mpoly = me_eval->mpoly;
-  const MLoop *mloop = me_eval->mloop;
+  const MVert *mvert = BKE_mesh_verts(me_eval);
+  const MLoop *mloop = BKE_mesh_loops(me_eval);
   const int *index_mp_to_orig = CustomData_get_layer(&me_eval->pdata, CD_ORIGINDEX);
 
   /* get the needed opengl matrices */
@@ -302,6 +303,9 @@ static void imapaint_pick_uv(
   minabsw = 1e10;
   uv[0] = uv[1] = 0.0;
 
+  const int *material_indices = (const int *)CustomData_get_layer_named(
+      &me_eval->pdata, CD_PROP_INT32, "material_index");
+
   /* test all faces in the derivedmesh with the original index of the picked face */
   /* face means poly here, not triangle, indeed */
   for (i = 0; i < tottri; i++, lt++) {
@@ -309,7 +313,6 @@ static void imapaint_pick_uv(
 
     if (findex == faceindex) {
       const MLoopUV *mloopuv;
-      const MPoly *mp = &mpoly[lt->poly];
       const MLoopUV *tri_uv[3];
       float tri_co[3][3];
 
@@ -321,7 +324,8 @@ static void imapaint_pick_uv(
         const Material *ma;
         const TexPaintSlot *slot;
 
-        ma = BKE_object_material_get(ob_eval, mp->mat_nr + 1);
+        ma = BKE_object_material_get(
+            ob_eval, material_indices == NULL ? 1 : material_indices[lt->poly] + 1);
         slot = &ma->texpaintslot[ma->paint_active_slot];
 
         if (!(slot && slot->uvname &&
@@ -400,7 +404,8 @@ void paint_sample_color(
   if (v3d && texpaint_proj) {
     /* first try getting a color directly from the mesh faces if possible */
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
     Object *ob_eval = DEG_get_evaluated_object(depsgraph, ob);
     ImagePaintSettings *imapaint = &scene->toolsettings->imapaint;
     bool use_material = (imapaint->mode == IMAGEPAINT_MODE_MATERIAL);
@@ -410,6 +415,8 @@ void paint_sample_color(
       cddata_masks.pmask |= CD_MASK_ORIGINDEX;
       Mesh *me = (Mesh *)ob->data;
       Mesh *me_eval = mesh_get_eval_final(depsgraph, scene, ob_eval, &cddata_masks);
+      const int *material_indices = (const int *)CustomData_get_layer_named(
+          &me_eval->pdata, CD_PROP_INT32, "material_index");
 
       ViewContext vc;
       const int mval[2] = {x, y};
@@ -427,8 +434,8 @@ void paint_sample_color(
 
           if (use_material) {
             /* Image and texture interpolation from material. */
-            MPoly *mp = me_eval->mpoly + faceindex;
-            Material *ma = BKE_object_material_get(ob_eval, mp->mat_nr + 1);
+            Material *ma = BKE_object_material_get(
+                ob_eval, material_indices ? material_indices[faceindex] + 1 : 1);
 
             /* Force refresh since paint slots are not updated when changing interpolation. */
             BKE_texpaint_slot_refresh_cache(scene, ma, ob);
@@ -697,7 +704,7 @@ static int vert_select_ungrouped_exec(bContext *C, wmOperator *op)
   Object *ob = CTX_data_active_object(C);
   Mesh *me = ob->data;
 
-  if (BLI_listbase_is_empty(&me->vertex_group_names) || (me->dvert == NULL)) {
+  if (BLI_listbase_is_empty(&me->vertex_group_names) || (BKE_mesh_deform_verts(me) == NULL)) {
     BKE_report(op->reports, RPT_ERROR, "No weights/vertex groups on object");
     return OPERATOR_CANCELLED;
   }
@@ -749,25 +756,68 @@ void PAINT_OT_face_select_hide(wmOperatorType *ot)
       ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected objects");
 }
 
-static int face_select_reveal_exec(bContext *C, wmOperator *op)
+static int vert_select_hide_exec(bContext *C, wmOperator *op)
+{
+  const bool unselected = RNA_boolean_get(op->ptr, "unselected");
+  Object *ob = CTX_data_active_object(C);
+  paintvert_hide(C, ob, unselected);
+  ED_region_tag_redraw(CTX_wm_region(C));
+  return OPERATOR_FINISHED;
+}
+
+void PAINT_OT_vert_select_hide(wmOperatorType *ot)
+{
+  ot->name = "Vertex Select Hide";
+  ot->description = "Hide selected vertices";
+  ot->idname = "PAINT_OT_vert_select_hide";
+
+  ot->exec = vert_select_hide_exec;
+  ot->poll = vert_paint_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  RNA_def_boolean(
+      ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected vertices");
+}
+
+static int face_vert_reveal_exec(bContext *C, wmOperator *op)
 {
   const bool select = RNA_boolean_get(op->ptr, "select");
   Object *ob = CTX_data_active_object(C);
-  paintface_reveal(C, ob, select);
+
+  if (BKE_paint_select_vert_test(ob)) {
+    paintvert_reveal(C, ob, select);
+  }
+  else {
+    paintface_reveal(C, ob, select);
+  }
+
   ED_region_tag_redraw(CTX_wm_region(C));
   return OPERATOR_FINISHED;
 }
 
-void PAINT_OT_face_select_reveal(wmOperatorType *ot)
+static bool face_vert_reveal_poll(bContext *C)
 {
-  ot->name = "Face Select Reveal";
-  ot->description = "Reveal hidden faces";
-  ot->idname = "PAINT_OT_face_select_reveal";
+  Object *ob = CTX_data_active_object(C);
 
-  ot->exec = face_select_reveal_exec;
-  ot->poll = facemask_paint_poll;
+  /* Allow using this operator when no selection is enabled but hiding is applied. */
+  return BKE_paint_select_elem_test(ob) || BKE_paint_always_hide_test(ob);
+}
+
+void PAINT_OT_face_vert_reveal(wmOperatorType *ot)
+{
+  ot->name = "Reveal Faces/Vertices";
+  ot->description = "Reveal hidden faces and vertices";
+  ot->idname = "PAINT_OT_face_vert_reveal";
+
+  ot->exec = face_vert_reveal_exec;
+  ot->poll = face_vert_reveal_poll;
 
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
-  RNA_def_boolean(ot->srna, "select", true, "Select", "");
+  RNA_def_boolean(ot->srna,
+                  "select",
+                  true,
+                  "Select",
+                  "Specifies whether the newly revealed geometry should be selected");
 }
diff --git a/source/blender/editors/sculpt_paint/paint_vertex.cc b/source/blender/editors/sculpt_paint/paint_vertex.cc
index 6dc8375bb0d..c38a79cb6bb 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex.cc
+++ b/source/blender/editors/sculpt_paint/paint_vertex.cc
@@ -773,6 +773,8 @@ struct WeightPaintGroupData {
  * paint stroke update - campbell */
 struct WeightPaintInfo {
 
+  MutableSpan<MDeformVert> dvert;
+
   int defbase_tot;
 
   /* both must add up to 'defbase_tot' */
@@ -815,7 +817,7 @@ static void do_weight_paint_vertex_single(
     float paintweight)
 {
   Mesh *me = (Mesh *)ob->data;
-  MDeformVert *dv = &me->dvert[index];
+  MDeformVert *dv = &wpi->dvert[index];
   bool topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
 
   MDeformWeight *dw;
@@ -875,7 +877,7 @@ static void do_weight_paint_vertex_single(
 
   /* get the mirror def vars */
   if (index_mirr != -1) {
-    dv_mirr = &me->dvert[index_mirr];
+    dv_mirr = &wpi->dvert[index_mirr];
     if (wp->flag & VP_FLAG_VGROUP_RESTRICT) {
       dw_mirr = BKE_defvert_find_index(dv_mirr, vgroup_mirr);
 
@@ -915,9 +917,9 @@ static void do_weight_paint_vertex_single(
 
   if (!brush_use_accumulate(wp)) {
     MDeformVert *dvert_prev = ob->sculpt->mode.wpaint.dvert_prev;
-    MDeformVert *dv_prev = defweight_prev_init(dvert_prev, me->dvert, index);
+    MDeformVert *dv_prev = defweight_prev_init(dvert_prev, wpi->dvert.data(), index);
     if (index_mirr != -1) {
-      defweight_prev_init(dvert_prev, me->dvert, index_mirr);
+      defweight_prev_init(dvert_prev, wpi->dvert.data(), index_mirr);
     }
 
     weight_prev = BKE_defvert_find_weight(dv_prev, wpi->active.index);
@@ -1028,7 +1030,7 @@ static void do_weight_paint_vertex_multi(
     float paintweight)
 {
   Mesh *me = (Mesh *)ob->data;
-  MDeformVert *dv = &me->dvert[index];
+  MDeformVert *dv = &wpi->dvert[index];
   bool topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
 
   /* mirror vars */
@@ -1044,7 +1046,7 @@ static void do_weight_paint_vertex_multi(
     index_mirr = mesh_get_x_mirror_vert(ob, nullptr, index, topology);
 
     if (!ELEM(index_mirr, -1, index)) {
-      dv_mirr = &me->dvert[index_mirr];
+      dv_mirr = &wpi->dvert[index_mirr];
     }
     else {
       index_mirr = -1;
@@ -1071,9 +1073,9 @@ static void do_weight_paint_vertex_multi(
 
   if (!brush_use_accumulate(wp)) {
     MDeformVert *dvert_prev = ob->sculpt->mode.wpaint.dvert_prev;
-    MDeformVert *dv_prev = defweight_prev_init(dvert_prev, me->dvert, index);
+    MDeformVert *dv_prev = defweight_prev_init(dvert_prev, wpi->dvert.data(), index);
     if (index_mirr != -1) {
-      defweight_prev_init(dvert_prev, me->dvert, index_mirr);
+      defweight_prev_init(dvert_prev, wpi->dvert.data(), index_mirr);
     }
 
     oldw = BKE_defvert_multipaint_collective_weight(
@@ -1235,6 +1237,8 @@ static void vertex_paint_init_session_data(const ToolSettings *ts, Object *ob)
   }
 
   Mesh *me = (Mesh *)ob->data;
+  const Span<MPoly> polys = me->polys();
+  const Span<MLoop> loops = me->loops();
 
   if (gmap->vert_to_loop == nullptr) {
     gmap->vert_map_mem = nullptr;
@@ -1243,15 +1247,15 @@ static void vertex_paint_init_session_data(const ToolSettings *ts, Object *ob)
     gmap->vert_to_poly = nullptr;
     BKE_mesh_vert_loop_map_create(&gmap->vert_to_loop,
                                   &gmap->vert_map_mem,
-                                  me->mpoly,
-                                  me->mloop,
+                                  polys.data(),
+                                  loops.data(),
                                   me->totvert,
                                   me->totpoly,
                                   me->totloop);
     BKE_mesh_vert_poly_map_create(&gmap->vert_to_poly,
                                   &gmap->poly_map_mem,
-                                  me->mpoly,
-                                  me->mloop,
+                                  polys.data(),
+                                  loops.data(),
                                   me->totvert,
                                   me->totpoly,
                                   me->totloop);
@@ -1900,7 +1904,7 @@ static void do_wpaint_precompute_weight_cb_ex(void *__restrict userdata,
                                               const TaskParallelTLS *__restrict UNUSED(tls))
 {
   SculptThreadedTaskData *data = (SculptThreadedTaskData *)userdata;
-  const MDeformVert *dv = &data->me->dvert[n];
+  const MDeformVert *dv = &data->wpi->dvert[n];
 
   data->wpd->precomputed_weight[n] = wpaint_get_active_weight(dv, data->wpi);
 }
@@ -1961,10 +1965,9 @@ static void do_wpaint_brush_blur_task_cb_ex(void *__restrict userdata,
     if (sculpt_brush_test_sq_fn(&test, vd.co)) {
       /* For grid based pbvh, take the vert whose loop corresponds to the current grid.
        * Otherwise, take the current vert. */
-      const int v_index = has_grids ? data->me->mloop[vd.grid_indices[vd.g]].v :
-                                      vd.vert_indices[vd.i];
+      const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
       const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-      const char v_flag = data->me->mvert[v_index].flag;
+      const char v_flag = ss->mvert[v_index].flag;
       /* If the vertex is selected */
       if (!(use_face_sel || use_vert_sel) || v_flag & SELECT) {
         /* Get the average poly weight */
@@ -1972,12 +1975,12 @@ static void do_wpaint_brush_blur_task_cb_ex(void *__restrict userdata,
         float weight_final = 0.0f;
         for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
           const int p_index = gmap->vert_to_poly[v_index].indices[j];
-          const MPoly *mp = &data->me->mpoly[p_index];
+          const MPoly *mp = &ss->mpoly[p_index];
 
           total_hit_loops += mp->totloop;
           for (int k = 0; k < mp->totloop; k++) {
             const int l_index = mp->loopstart + k;
-            const MLoop *ml = &data->me->mloop[l_index];
+            const MLoop *ml = &ss->mloop[l_index];
             weight_final += data->wpd->precomputed_weight[ml->v];
           }
         }
@@ -2057,10 +2060,9 @@ static void do_wpaint_brush_smear_task_cb_ex(void *__restrict userdata,
       if (sculpt_brush_test_sq_fn(&test, vd.co)) {
         /* For grid based pbvh, take the vert whose loop corresponds to the current grid.
          * Otherwise, take the current vert. */
-        const int v_index = has_grids ? data->me->mloop[vd.grid_indices[vd.g]].v :
-                                        vd.vert_indices[vd.i];
+        const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
         const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-        const MVert *mv_curr = &data->me->mvert[v_index];
+        const MVert *mv_curr = &ss->mvert[v_index];
 
         /* If the vertex is selected */
         if (!(use_face_sel || use_vert_sel) || mv_curr->flag & SELECT) {
@@ -2082,12 +2084,12 @@ static void do_wpaint_brush_smear_task_cb_ex(void *__restrict userdata,
             float weight_final = 0.0;
             for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
               const int p_index = gmap->vert_to_poly[v_index].indices[j];
-              const MPoly *mp = &data->me->mpoly[p_index];
-              const MLoop *ml_other = &data->me->mloop[mp->loopstart];
+              const MPoly *mp = &ss->mpoly[p_index];
+              const MLoop *ml_other = &ss->mloop[mp->loopstart];
               for (int k = 0; k < mp->totloop; k++, ml_other++) {
                 const uint v_other_index = ml_other->v;
                 if (v_other_index != v_index) {
-                  const MVert *mv_other = &data->me->mvert[v_other_index];
+                  const MVert *mv_other = &ss->mvert[v_other_index];
 
                   /* Get the direction from the selected vert to the neighbor. */
                   float other_dir[3];
@@ -2164,11 +2166,10 @@ static void do_wpaint_brush_draw_task_cb_ex(void *__restrict userdata,
       /* NOTE: grids are 1:1 with corners (aka loops).
        * For multires, take the vert whose loop corresponds to the current grid.
        * Otherwise, take the current vert. */
-      const int v_index = has_grids ? data->me->mloop[vd.grid_indices[vd.g]].v :
-                                      vd.vert_indices[vd.i];
+      const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
       const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
 
-      const char v_flag = data->me->mvert[v_index].flag;
+      const char v_flag = ss->mvert[v_index].flag;
       /* If the vertex is selected */
       if (!(use_face_sel || use_vert_sel) || v_flag & SELECT) {
         float brush_strength = cache->bstrength;
@@ -2232,13 +2233,12 @@ static void do_wpaint_brush_calc_average_weight_cb_ex(
                                                       1.0f;
       if (angle_cos > 0.0 &&
           BKE_brush_curve_strength(data->brush, sqrtf(test.dist), cache->radius) > 0.0) {
-        const int v_index = has_grids ? data->me->mloop[vd.grid_indices[vd.g]].v :
-                                        vd.vert_indices[vd.i];
-        const char v_flag = data->me->mvert[v_index].flag;
+        const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v : vd.vert_indices[vd.i];
+        const char v_flag = ss->mvert[v_index].flag;
 
         /* If the vertex is selected. */
         if (!(use_face_sel || use_vert_sel) || v_flag & SELECT) {
-          const MDeformVert *dv = &data->me->dvert[v_index];
+          const MDeformVert *dv = &data->wpi->dvert[v_index];
           accum->len += 1;
           accum->value += wpaint_get_active_weight(dv, data->wpi);
         }
@@ -2510,7 +2510,11 @@ static void wpaint_stroke_update_step(bContext *C,
   /* load projection matrix */
   mul_m4_m4m4(mat, vc->rv3d->persmat, ob->obmat);
 
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
+
   /* *** setup WeightPaintInfo - pass onto do_weight_paint_vertex *** */
+  wpi.dvert = mesh->deform_verts_for_write();
+
   wpi.defbase_tot = wpd->defbase_tot;
   wpi.defbase_sel = wpd->defbase_sel;
   wpi.defbase_tot_sel = wpd->defbase_tot_sel;
@@ -2532,7 +2536,7 @@ static void wpaint_stroke_update_step(bContext *C,
   /* *** done setting up WeightPaintInfo *** */
 
   if (wpd->precomputed_weight) {
-    precompute_weight_values(C, ob, brush, wpd, &wpi, (Mesh *)ob->data);
+    precompute_weight_values(C, ob, brush, wpd, &wpi, mesh);
   }
 
   wpaint_do_symmetrical_brush_actions(C, ob, wp, sd, wpd, &wpi);
@@ -2545,9 +2549,9 @@ static void wpaint_stroke_update_step(bContext *C,
   mul_v3_m4v3(loc_world, ob->obmat, ss->cache->true_location);
   paint_last_stroke_update(scene, loc_world);
 
-  BKE_mesh_batch_cache_dirty_tag((Mesh *)ob->data, BKE_MESH_BATCH_DIRTY_ALL);
+  BKE_mesh_batch_cache_dirty_tag(mesh, BKE_MESH_BATCH_DIRTY_ALL);
 
-  DEG_id_tag_update((ID *)ob->data, 0);
+  DEG_id_tag_update(&mesh->id, 0);
   WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);
   swap_m4m4(wpd->vc.rv3d->persmat, mat);
 
@@ -2980,10 +2984,10 @@ static void do_vpaint_brush_blur_loops(bContext *C,
         if (sculpt_brush_test_sq_fn(&test, vd.co)) {
           /* For grid based pbvh, take the vert whose loop corresponds to the current grid.
            * Otherwise, take the current vert. */
-          const int v_index = has_grids ? me->mloop[vd.grid_indices[vd.g]].v :
+          const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v :
                                           vd.vert_indices[vd.i];
           const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-          const MVert *mv = &me->mvert[v_index];
+          const MVert *mv = &ss->mvert[v_index];
 
           /* If the vertex is selected for painting. */
           if (!use_vert_sel || mv->flag & SELECT) {
@@ -3006,7 +3010,7 @@ static void do_vpaint_brush_blur_loops(bContext *C,
 
               for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                 int p_index = gmap->vert_to_poly[v_index].indices[j];
-                const MPoly *mp = &me->mpoly[p_index];
+                const MPoly *mp = &ss->mpoly[p_index];
                 if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                   total_hit_loops += mp->totloop;
                   for (int k = 0; k < mp->totloop; k++) {
@@ -3040,8 +3044,8 @@ static void do_vpaint_brush_blur_loops(bContext *C,
                 for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                   const int p_index = gmap->vert_to_poly[v_index].indices[j];
                   const int l_index = gmap->vert_to_loop[v_index].indices[j];
-                  BLI_assert(me->mloop[l_index].v == v_index);
-                  const MPoly *mp = &me->mpoly[p_index];
+                  BLI_assert(ss->mloop[l_index].v == v_index);
+                  const MPoly *mp = &ss->mpoly[p_index];
                   if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                     Color color_orig(0, 0, 0, 0); /* unused when array is nullptr */
 
@@ -3122,10 +3126,10 @@ static void do_vpaint_brush_blur_verts(bContext *C,
         if (sculpt_brush_test_sq_fn(&test, vd.co)) {
           /* For grid based pbvh, take the vert whose loop corresponds to the current grid.
            * Otherwise, take the current vert. */
-          const int v_index = has_grids ? me->mloop[vd.grid_indices[vd.g]].v :
+          const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v :
                                           vd.vert_indices[vd.i];
           const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-          const MVert *mv = &me->mvert[v_index];
+          const MVert *mv = &ss->mvert[v_index];
 
           /* If the vertex is selected for painting. */
           if (!use_vert_sel || mv->flag & SELECT) {
@@ -3148,12 +3152,12 @@ static void do_vpaint_brush_blur_verts(bContext *C,
 
               for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                 int p_index = gmap->vert_to_poly[v_index].indices[j];
-                const MPoly *mp = &me->mpoly[p_index];
+                const MPoly *mp = &ss->mpoly[p_index];
                 if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                   total_hit_loops += mp->totloop;
                   for (int k = 0; k < mp->totloop; k++) {
                     const uint l_index = mp->loopstart + k;
-                    const uint v_index = me->mloop[l_index].v;
+                    const uint v_index = ss->mloop[l_index].v;
 
                     Color *col = lcol + v_index;
 
@@ -3184,9 +3188,9 @@ static void do_vpaint_brush_blur_verts(bContext *C,
                 for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                   const int p_index = gmap->vert_to_poly[v_index].indices[j];
 
-                  BLI_assert(me->mloop[gmap->vert_to_loop[v_index].indices[j]].v == v_index);
+                  BLI_assert(ss->mloop[gmap->vert_to_loop[v_index].indices[j]].v == v_index);
 
-                  const MPoly *mp = &me->mpoly[p_index];
+                  const MPoly *mp = &ss->mpoly[p_index];
                   if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                     Color color_orig(0, 0, 0, 0); /* unused when array is nullptr */
 
@@ -3273,10 +3277,10 @@ static void do_vpaint_brush_smear(bContext *C,
           if (sculpt_brush_test_sq_fn(&test, vd.co)) {
             /* For grid based pbvh, take the vert whose loop corresponds to the current grid.
              * Otherwise, take the current vert. */
-            const int v_index = has_grids ? me->mloop[vd.grid_indices[vd.g]].v :
+            const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v :
                                             vd.vert_indices[vd.i];
             const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-            const MVert *mv_curr = &me->mvert[v_index];
+            const MVert *mv_curr = &ss->mvert[v_index];
 
             /* if the vertex is selected for painting. */
             if (!use_vert_sel || mv_curr->flag & SELECT) {
@@ -3305,15 +3309,15 @@ static void do_vpaint_brush_smear(bContext *C,
                 for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                   const int p_index = gmap->vert_to_poly[v_index].indices[j];
                   const int l_index = gmap->vert_to_loop[v_index].indices[j];
-                  BLI_assert(me->mloop[l_index].v == v_index);
+                  BLI_assert(ss->mloop[l_index].v == v_index);
                   UNUSED_VARS_NDEBUG(l_index);
-                  const MPoly *mp = &me->mpoly[p_index];
+                  const MPoly *mp = &ss->mpoly[p_index];
                   if (!use_face_sel || mp->flag & ME_FACE_SEL) {
-                    const MLoop *ml_other = &me->mloop[mp->loopstart];
+                    const MLoop *ml_other = &ss->mloop[mp->loopstart];
                     for (int k = 0; k < mp->totloop; k++, ml_other++) {
                       const uint v_other_index = ml_other->v;
                       if (v_other_index != v_index) {
-                        const MVert *mv_other = &me->mvert[v_other_index];
+                        const MVert *mv_other = &ss->mvert[v_other_index];
 
                         /* Get the direction from the
                          * selected vert to the neighbor. */
@@ -3359,10 +3363,10 @@ static void do_vpaint_brush_smear(bContext *C,
                     else {
                       const int l_index = gmap->vert_to_loop[v_index].indices[j];
                       elem_index = l_index;
-                      BLI_assert(me->mloop[l_index].v == v_index);
+                      BLI_assert(ss->mloop[l_index].v == v_index);
                     }
 
-                    const MPoly *mp = &me->mpoly[p_index];
+                    const MPoly *mp = &ss->mpoly[p_index];
                     if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                       /* Get the previous element color */
                       Color color_orig(0, 0, 0, 0); /* unused when array is nullptr */
@@ -3435,11 +3439,11 @@ static void calculate_average_color(VPaintData<Color, Traits, domain> *vpd,
       BKE_pbvh_vertex_iter_begin (ss->pbvh, nodes[n], vd, PBVH_ITER_UNIQUE) {
         /* Test to see if the vertex coordinates are within the spherical brush region. */
         if (sculpt_brush_test_sq_fn(&test, vd.co)) {
-          const int v_index = has_grids ? me->mloop[vd.grid_indices[vd.g]].v :
+          const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v :
                                           vd.vert_indices[vd.i];
           if (BKE_brush_curve_strength(brush, 0.0, cache->radius) > 0.0) {
             /* If the vertex is selected for painting. */
-            const MVert *mv = &me->mvert[v_index];
+            const MVert *mv = &ss->mvert[v_index];
             if (!use_vert_sel || mv->flag & SELECT) {
               accum2->len += gmap->vert_to_loop[v_index].count;
               /* if a vertex is within the brush region, then add its color to the blend. */
@@ -3555,10 +3559,10 @@ static void vpaint_do_draw(bContext *C,
           /* NOTE: Grids are 1:1 with corners (aka loops).
            * For grid based pbvh, take the vert whose loop corresponds to the current grid.
            * Otherwise, take the current vert. */
-          const int v_index = has_grids ? me->mloop[vd.grid_indices[vd.g]].v :
+          const int v_index = has_grids ? ss->mloop[vd.grid_indices[vd.g]].v :
                                           vd.vert_indices[vd.i];
           const float grid_alpha = has_grids ? 1.0f / vd.gridsize : 1.0f;
-          const MVert *mv = &me->mvert[v_index];
+          const MVert *mv = &ss->mvert[v_index];
 
           /* If the vertex is selected for painting. */
           if (!use_vert_sel || mv->flag & SELECT) {
@@ -3612,8 +3616,8 @@ static void vpaint_do_draw(bContext *C,
                 for (int j = 0; j < gmap->vert_to_poly[v_index].count; j++) {
                   const int p_index = gmap->vert_to_poly[v_index].indices[j];
                   const int l_index = gmap->vert_to_loop[v_index].indices[j];
-                  BLI_assert(me->mloop[l_index].v == v_index);
-                  const MPoly *mp = &me->mpoly[p_index];
+                  BLI_assert(ss->mloop[l_index].v == v_index);
+                  const MPoly *mp = &ss->mpoly[p_index];
                   if (!use_face_sel || mp->flag & ME_FACE_SEL) {
                     Color color_orig = Color(0, 0, 0, 0); /* unused when array is nullptr */
 
@@ -3957,7 +3961,7 @@ static int vpaint_invoke(bContext *C, wmOperator *op, const wmEvent *event)
     BKE_pbvh_ensure_node_loops(ob->sculpt->pbvh);
   }
 
-  SCULPT_undo_push_begin(ob, "Vertex Paint");
+  SCULPT_undo_push_begin_ex(ob, "Vertex Paint");
 
   if ((retval = op->type->modal(C, op, event)) == OPERATOR_FINISHED) {
     paint_stroke_free(C, op, (PaintStroke *)op->customdata);
@@ -4084,27 +4088,30 @@ static bool vertex_color_set(Object *ob, ColorPaint4f paintcol_in, CustomDataLay
   }
   else {
     Color *color_layer = static_cast<Color *>(layer->data);
+    const Span<MVert> verts = me->verts();
+    const Span<MPoly> polys = me->polys();
+    const Span<MLoop> loops = me->loops();
 
-    const MPoly *mp = me->mpoly;
-    for (int i = 0; i < me->totpoly; i++, mp++) {
-      if (use_face_sel && !(mp->flag & ME_FACE_SEL)) {
+    for (const int i : polys.index_range()) {
+      const MPoly &poly = polys[i];
+      if (use_face_sel && !(poly.flag & ME_FACE_SEL)) {
         continue;
       }
 
       int j = 0;
       do {
-        uint vidx = me->mloop[mp->loopstart + j].v;
+        uint vidx = loops[poly.loopstart + j].v;
 
-        if (!(use_vert_sel && !(me->mvert[vidx].flag & SELECT))) {
+        if (!(use_vert_sel && !(verts[vidx].flag & SELECT))) {
           if constexpr (domain == ATTR_DOMAIN_CORNER) {
-            color_layer[mp->loopstart + j] = paintcol;
+            color_layer[poly.loopstart + j] = paintcol;
           }
           else {
             color_layer[vidx] = paintcol;
           }
         }
         j++;
-      } while (j < mp->totloop);
+      } while (j < poly.totloop);
     }
 
     /* remove stale me->mcol, will be added later */
@@ -4134,7 +4141,7 @@ static bool paint_object_attributes_active_color_fill_ex(Object *ob,
   if (!layer) {
     return false;
   }
-  /* Store original #Mesh.editflag.*/
+  /* Store original #Mesh.editflag. */
   const decltype(me->editflag) editflag = me->editflag;
   if (!only_selected) {
     me->editflag &= ~ME_EDIT_PAINT_FACE_SEL;
diff --git a/source/blender/editors/sculpt_paint/paint_vertex_color_ops.cc b/source/blender/editors/sculpt_paint/paint_vertex_color_ops.cc
index 8b726c7b942..a8e64462a2a 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex_color_ops.cc
+++ b/source/blender/editors/sculpt_paint/paint_vertex_color_ops.cc
@@ -50,7 +50,7 @@ static bool vertex_weight_paint_mode_poll(bContext *C)
   Object *ob = CTX_data_active_object(C);
   Mesh *me = BKE_mesh_from_object(ob);
   return (ob && (ELEM(ob->mode, OB_MODE_VERTEX_PAINT, OB_MODE_WEIGHT_PAINT))) &&
-         (me && me->totpoly && me->dvert);
+         (me && me->totpoly && !me->deform_verts().is_empty());
 }
 
 static void tag_object_after_update(Object *object)
@@ -92,7 +92,7 @@ static bool vertex_paint_from_weight(Object *ob)
     return false;
   }
 
-  bke::MutableAttributeAccessor attributes = bke::mesh_attributes_for_write(*me);
+  bke::MutableAttributeAccessor attributes = me->attributes_for_write();
 
   bke::GAttributeWriter color_attribute = attributes.lookup_for_write(active_color_layer->name);
   if (!color_attribute) {
@@ -159,15 +159,15 @@ static IndexMask get_selected_indices(const Mesh &mesh,
                                       Vector<int64_t> &indices)
 {
   using namespace blender;
-  Span<MVert> verts(mesh.mvert, mesh.totvert);
-  Span<MPoly> faces(mesh.mpoly, mesh.totpoly);
+  const Span<MVert> verts = mesh.verts();
+  const Span<MPoly> polys = mesh.polys();
 
-  bke::AttributeAccessor attributes = bke::mesh_attributes(mesh);
+  bke::AttributeAccessor attributes = mesh.attributes();
 
   if (mesh.editflag & ME_EDIT_PAINT_FACE_SEL) {
     const VArray<bool> selection = attributes.adapt_domain(
-        VArray<bool>::ForFunc(faces.size(),
-                              [&](const int i) { return faces[i].flag & ME_FACE_SEL; }),
+        VArray<bool>::ForFunc(polys.size(),
+                              [&](const int i) { return polys[i].flag & ME_FACE_SEL; }),
         ATTR_DOMAIN_FACE,
         domain);
 
@@ -186,7 +186,7 @@ static IndexMask get_selected_indices(const Mesh &mesh,
   return IndexMask(attributes.domain_size(domain));
 }
 
-static void face_corner_color_equalize_vertices(Mesh &mesh, const IndexMask selection)
+static void face_corner_color_equalize_verts(Mesh &mesh, const IndexMask selection)
 {
   using namespace blender;
 
@@ -196,7 +196,7 @@ static void face_corner_color_equalize_vertices(Mesh &mesh, const IndexMask sele
     return;
   }
 
-  bke::AttributeAccessor attributes = bke::mesh_attributes(mesh);
+  bke::AttributeAccessor attributes = mesh.attributes();
 
   if (attributes.lookup_meta_data(active_color_layer->name)->domain == ATTR_DOMAIN_POINT) {
     return;
@@ -221,7 +221,7 @@ static bool vertex_color_smooth(Object *ob)
   Vector<int64_t> indices;
   const IndexMask selection = get_selected_indices(*me, ATTR_DOMAIN_CORNER, indices);
 
-  face_corner_color_equalize_vertices(*me, selection);
+  face_corner_color_equalize_verts(*me, selection);
 
   tag_object_after_update(ob);
 
@@ -270,7 +270,7 @@ static bool transform_active_color(Mesh &mesh, const TransformFn &transform_fn)
     return false;
   }
 
-  bke::MutableAttributeAccessor attributes = bke::mesh_attributes_for_write(mesh);
+  bke::MutableAttributeAccessor attributes = mesh.attributes_for_write();
 
   bke::GAttributeWriter color_attribute = attributes.lookup_for_write(active_color_layer->name);
   if (!color_attribute) {
@@ -320,7 +320,7 @@ static int vertex_color_brightness_contrast_exec(bContext *C, wmOperator *op)
     /*
      * The algorithm is by Werner D. Streidt
      * (http://visca.com/ffactory/archives/5-99/msg00021.html)
-     * Extracted of OpenCV demhist.c
+     * Extracted of OpenCV `demhist.c`.
      */
     if (contrast > 0) {
       gain = 1.0f - delta * 2.0f;
diff --git a/source/blender/editors/sculpt_paint/paint_vertex_weight_ops.c b/source/blender/editors/sculpt_paint/paint_vertex_weight_ops.c
index d98660d8939..0a0d7cff214 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex_weight_ops.c
+++ b/source/blender/editors/sculpt_paint/paint_vertex_weight_ops.c
@@ -168,8 +168,9 @@ static int weight_sample_invoke(bContext *C, wmOperator *op, const wmEvent *even
 
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
   me = BKE_mesh_from_object(vc.obact);
+  const MDeformVert *dvert = BKE_mesh_deform_verts(me);
 
-  if (me && me->dvert && vc.v3d && vc.rv3d && (me->vertex_group_active_index != 0)) {
+  if (me && dvert && vc.v3d && vc.rv3d && (me->vertex_group_active_index != 0)) {
     const bool use_vert_sel = (me->editflag & ME_EDIT_PAINT_VERT_SEL) != 0;
     int v_idx_best = -1;
     uint index;
@@ -200,7 +201,7 @@ static int weight_sample_invoke(bContext *C, wmOperator *op, const wmEvent *even
       ToolSettings *ts = vc.scene->toolsettings;
       Brush *brush = BKE_paint_brush(&ts->wpaint->paint);
       const int vgroup_active = me->vertex_group_active_index - 1;
-      float vgroup_weight = BKE_defvert_find_weight(&me->dvert[v_idx_best], vgroup_active);
+      float vgroup_weight = BKE_defvert_find_weight(&dvert[v_idx_best], vgroup_active);
       const int defbase_tot = BLI_listbase_count(&me->vertex_group_names);
       bool use_lock_relative = ts->wpaint_lock_relative;
       bool *defbase_locked = NULL, *defbase_unlocked = NULL;
@@ -232,7 +233,7 @@ static int weight_sample_invoke(bContext *C, wmOperator *op, const wmEvent *even
 
           bool is_normalized = ts->auto_normalize || use_lock_relative;
           vgroup_weight = BKE_defvert_multipaint_collective_weight(
-              &me->dvert[v_idx_best], defbase_tot, defbase_sel, defbase_tot_sel, is_normalized);
+              &dvert[v_idx_best], defbase_tot, defbase_sel, defbase_tot_sel, is_normalized);
         }
 
         MEM_freeN(defbase_sel);
@@ -243,7 +244,7 @@ static int weight_sample_invoke(bContext *C, wmOperator *op, const wmEvent *even
             defbase_tot, defbase_locked, defbase_unlocked, defbase_locked, defbase_unlocked);
 
         vgroup_weight = BKE_defvert_lock_relative_weight(
-            vgroup_weight, &me->dvert[v_idx_best], defbase_tot, defbase_locked, defbase_unlocked);
+            vgroup_weight, &dvert[v_idx_best], defbase_tot, defbase_locked, defbase_unlocked);
       }
 
       MEM_SAFE_FREE(defbase_locked);
@@ -316,8 +317,11 @@ static const EnumPropertyItem *weight_paint_sample_enum_itemf(bContext *C,
 
       ED_view3d_viewcontext_init(C, &vc, depsgraph);
       me = BKE_mesh_from_object(vc.obact);
+      const MPoly *polys = BKE_mesh_polys(me);
+      const MLoop *loops = BKE_mesh_loops(me);
+      const MDeformVert *dverts = BKE_mesh_deform_verts(me);
 
-      if (me && me->dvert && vc.v3d && vc.rv3d && me->vertex_group_names.first) {
+      if (me && dverts && vc.v3d && vc.rv3d && me->vertex_group_names.first) {
         const int defbase_tot = BLI_listbase_count(&me->vertex_group_names);
         const bool use_vert_sel = (me->editflag & ME_EDIT_PAINT_VERT_SEL) != 0;
         int *groups = MEM_callocN(defbase_tot * sizeof(int), "groups");
@@ -334,17 +338,17 @@ static const EnumPropertyItem *weight_paint_sample_enum_itemf(bContext *C,
 
         if (use_vert_sel) {
           if (ED_mesh_pick_vert(C, vc.obact, mval, ED_MESH_PICK_DEFAULT_VERT_DIST, true, &index)) {
-            MDeformVert *dvert = &me->dvert[index];
+            const MDeformVert *dvert = &dverts[index];
             found |= weight_paint_sample_enum_itemf__helper(dvert, defbase_tot, groups);
           }
         }
         else {
           if (ED_mesh_pick_face(C, vc.obact, mval, ED_MESH_PICK_DEFAULT_FACE_DIST, &index)) {
-            const MPoly *mp = &me->mpoly[index];
+            const MPoly *mp = &polys[index];
             uint fidx = mp->totloop - 1;
 
             do {
-              MDeformVert *dvert = &me->dvert[me->mloop[mp->loopstart + fidx].v];
+              const MDeformVert *dvert = &dverts[loops[mp->loopstart + fidx].v];
               found |= weight_paint_sample_enum_itemf__helper(dvert, defbase_tot, groups);
             } while (fidx--);
           }
@@ -441,7 +445,12 @@ static bool weight_paint_set(Object *ob, float paintweight)
   /* mutually exclusive, could be made into a */
   const short paint_selmode = ME_EDIT_PAINT_SEL_MODE(me);
 
-  if (me->totpoly == 0 || me->dvert == NULL || !me->mpoly) {
+  const MVert *verts = BKE_mesh_verts(me);
+  const MPoly *polys = BKE_mesh_polys(me);
+  const MLoop *loops = BKE_mesh_loops(me);
+  MDeformVert *dvert = BKE_mesh_deform_verts_for_write(me);
+
+  if (me->totpoly == 0 || dvert == NULL) {
     return false;
   }
 
@@ -453,9 +462,9 @@ static bool weight_paint_set(Object *ob, float paintweight)
   }
 
   struct WPaintPrev wpp;
-  wpaint_prev_create(&wpp, me->dvert, me->totvert);
+  wpaint_prev_create(&wpp, dvert, me->totvert);
 
-  for (index = 0, mp = me->mpoly; index < me->totpoly; index++, mp++) {
+  for (index = 0, mp = polys; index < me->totpoly; index++, mp++) {
     uint fidx = mp->totloop - 1;
 
     if ((paint_selmode == SCE_SELECT_FACE) && !(mp->flag & ME_FACE_SEL)) {
@@ -463,14 +472,14 @@ static bool weight_paint_set(Object *ob, float paintweight)
     }
 
     do {
-      uint vidx = me->mloop[mp->loopstart + fidx].v;
+      uint vidx = loops[mp->loopstart + fidx].v;
 
-      if (!me->dvert[vidx].flag) {
-        if ((paint_selmode == SCE_SELECT_VERTEX) && !(me->mvert[vidx].flag & SELECT)) {
+      if (!dvert[vidx].flag) {
+        if ((paint_selmode == SCE_SELECT_VERTEX) && !(verts[vidx].flag & SELECT)) {
           continue;
         }
 
-        dw = BKE_defvert_ensure_index(&me->dvert[vidx], vgroup_active);
+        dw = BKE_defvert_ensure_index(&dvert[vidx], vgroup_active);
         if (dw) {
           dw_prev = BKE_defvert_ensure_index(wpp.wpaint_prev + vidx, vgroup_active);
           dw_prev->weight = dw->weight; /* set the undo weight */
@@ -482,11 +491,11 @@ static bool weight_paint_set(Object *ob, float paintweight)
             if (j >= 0) {
               /* copy, not paint again */
               if (vgroup_mirror != -1) {
-                dw = BKE_defvert_ensure_index(me->dvert + j, vgroup_mirror);
+                dw = BKE_defvert_ensure_index(dvert + j, vgroup_mirror);
                 dw_prev = BKE_defvert_ensure_index(wpp.wpaint_prev + j, vgroup_mirror);
               }
               else {
-                dw = BKE_defvert_ensure_index(me->dvert + j, vgroup_active);
+                dw = BKE_defvert_ensure_index(dvert + j, vgroup_active);
                 dw_prev = BKE_defvert_ensure_index(wpp.wpaint_prev + j, vgroup_active);
               }
               dw_prev->weight = dw->weight; /* set the undo weight */
@@ -494,14 +503,14 @@ static bool weight_paint_set(Object *ob, float paintweight)
             }
           }
         }
-        me->dvert[vidx].flag = 1;
+        dvert[vidx].flag = 1;
       }
 
     } while (fidx--);
   }
 
   {
-    MDeformVert *dv = me->dvert;
+    MDeformVert *dv = dvert;
     for (index = me->totvert; index != 0; index--, dv++) {
       dv->flag = 0;
     }
@@ -574,6 +583,7 @@ typedef struct WPGradient_userData {
   struct ARegion *region;
   Scene *scene;
   Mesh *me;
+  MDeformVert *dvert;
   Brush *brush;
   const float *sco_start; /* [2] */
   const float *sco_end;   /* [2] */
@@ -593,7 +603,6 @@ typedef struct WPGradient_userData {
 
 static void gradientVert_update(WPGradient_userData *grad_data, int index)
 {
-  Mesh *me = grad_data->me;
   WPGradient_vertStore *vs = &grad_data->vert_cache->elem[index];
 
   /* Optionally restrict to assigned vertices only. */
@@ -617,7 +626,7 @@ static void gradientVert_update(WPGradient_userData *grad_data, int index)
   alpha = BKE_brush_curve_strength_clamped(grad_data->brush, alpha, 1.0f);
 
   if (alpha != 0.0f) {
-    MDeformVert *dv = &me->dvert[index];
+    MDeformVert *dv = &grad_data->dvert[index];
     MDeformWeight *dw = BKE_defvert_ensure_index(dv, grad_data->def_nr);
     // dw->weight = alpha; // testing
     int tool = grad_data->brush->blend;
@@ -631,7 +640,7 @@ static void gradientVert_update(WPGradient_userData *grad_data, int index)
     vs->flag |= VGRAD_STORE_IS_MODIFIED;
   }
   else {
-    MDeformVert *dv = &me->dvert[index];
+    MDeformVert *dv = &grad_data->dvert[index];
     if (vs->flag & VGRAD_STORE_DW_EXIST) {
       /* normally we NULL check, but in this case we know it exists */
       MDeformWeight *dw = BKE_defvert_find_index(dv, grad_data->def_nr);
@@ -669,10 +678,9 @@ static void gradientVertInit__mapFunc(void *userData,
                                       const float UNUSED(no[3]))
 {
   WPGradient_userData *grad_data = userData;
-  Mesh *me = grad_data->me;
   WPGradient_vertStore *vs = &grad_data->vert_cache->elem[index];
 
-  if (grad_data->use_select && !(me->mvert[index].flag & SELECT)) {
+  if (grad_data->use_select && !(grad_data->dvert[index].flag & SELECT)) {
     copy_v2_fl(vs->sco, FLT_MAX);
     return;
   }
@@ -693,7 +701,7 @@ static void gradientVertInit__mapFunc(void *userData,
     return;
   }
 
-  MDeformVert *dv = &me->dvert[index];
+  MDeformVert *dv = &grad_data->dvert[index];
   const MDeformWeight *dw = BKE_defvert_find_index(dv, grad_data->def_nr);
   if (dw) {
     vs->weight_orig = dw->weight;
@@ -727,8 +735,9 @@ static int paint_weight_gradient_modal(bContext *C, wmOperator *op, const wmEven
     if (vert_cache != NULL) {
       Mesh *me = ob->data;
       if (vert_cache->wpp.wpaint_prev) {
-        BKE_defvert_array_free_elems(me->dvert, me->totvert);
-        BKE_defvert_array_copy(me->dvert, vert_cache->wpp.wpaint_prev, me->totvert);
+        MDeformVert *dvert = BKE_mesh_deform_verts_for_write(me);
+        BKE_defvert_array_free_elems(dvert, me->totvert);
+        BKE_defvert_array_copy(dvert, vert_cache->wpp.wpaint_prev, me->totvert);
         wpaint_prev_destroy(&vert_cache->wpp);
       }
       MEM_freeN(vert_cache);
@@ -753,6 +762,7 @@ static int paint_weight_gradient_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   Object *ob = CTX_data_active_object(C);
   Mesh *me = ob->data;
+  MDeformVert *dverts = BKE_mesh_deform_verts_for_write(me);
   int x_start = RNA_int_get(op->ptr, "xstart");
   int y_start = RNA_int_get(op->ptr, "ystart");
   int x_end = RNA_int_get(op->ptr, "xend");
@@ -774,7 +784,7 @@ static int paint_weight_gradient_exec(bContext *C, wmOperator *op)
       data.is_init = true;
 
       wpaint_prev_create(
-          &((WPGradient_vertStoreBase *)gesture->user_data.data)->wpp, me->dvert, me->totvert);
+          &((WPGradient_vertStoreBase *)gesture->user_data.data)->wpp, dverts, me->totvert);
 
       /* On initialization only, convert face -> vert sel. */
       if (me->editflag & ME_EDIT_PAINT_FACE_SEL) {
@@ -797,6 +807,7 @@ static int paint_weight_gradient_exec(bContext *C, wmOperator *op)
   data.region = region;
   data.scene = scene;
   data.me = ob->data;
+  data.dvert = dverts;
   data.sco_start = sco_start;
   data.sco_end = sco_end;
   data.sco_line_div = 1.0f / len_v2v2(sco_start, sco_end);
@@ -851,7 +862,7 @@ static int paint_weight_gradient_exec(bContext *C, wmOperator *op)
     const int vgroup_num = BLI_listbase_count(&me->vertex_group_names);
     bool *vgroup_validmap = BKE_object_defgroup_validmap_get(ob, vgroup_num);
     if (vgroup_validmap != NULL) {
-      MDeformVert *dvert = me->dvert;
+      MDeformVert *dvert = dverts;
       for (int i = 0; i < me->totvert; i++) {
         if ((data.vert_cache->elem[i].flag & VGRAD_STORE_IS_MODIFIED) != 0) {
           BKE_defvert_normalize_lock_single(&dvert[i], vgroup_validmap, vgroup_num, data.def_nr);
diff --git a/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c b/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
index 5a63af4149a..ac16631f115 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
+++ b/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
@@ -59,7 +59,7 @@ bool ED_wpaint_ensure_data(bContext *C,
   }
 
   /* if nothing was added yet, we make dverts and a vertex deform group */
-  if (!me->dvert) {
+  if (BKE_mesh_deform_verts(me) == NULL) {
     BKE_object_defgroup_data_create(&me->id);
     WM_event_add_notifier(C, NC_GEOM | ND_DATA, me);
   }
diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index 906c4fd35fe..688573d78a6 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -116,28 +116,28 @@ int SCULPT_vertex_count_get(SculptSession *ss)
     case PBVH_BMESH:
       return BM_mesh_elem_count(BKE_pbvh_get_bmesh(ss->pbvh), BM_VERT);
     case PBVH_GRIDS:
-      return BKE_pbvh_get_grid_num_vertices(ss->pbvh);
+      return BKE_pbvh_get_grid_num_verts(ss->pbvh);
   }
 
   return 0;
 }
 
-const float *SCULPT_vertex_co_get(SculptSession *ss, int index)
+const float *SCULPT_vertex_co_get(SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
       if (ss->shapekey_active || ss->deform_modifiers_active) {
         const MVert *mverts = BKE_pbvh_get_verts(ss->pbvh);
-        return mverts[index].co;
+        return mverts[vertex.i].co;
       }
-      return ss->mvert[index].co;
+      return ss->mvert[vertex.i].co;
     }
     case PBVH_BMESH:
-      return BM_vert_at_index(BKE_pbvh_get_bmesh(ss->pbvh), index)->co;
+      return ((BMVert *)vertex.i)->co;
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       CCGElem *elem = BKE_pbvh_get_grids(ss->pbvh)[grid_index];
       return CCG_elem_co(key, CCG_elem_offset(key, elem, vertex_index));
     }
@@ -158,31 +158,33 @@ bool SCULPT_has_colors(const SculptSession *ss)
   return ss->vcol || ss->mcol;
 }
 
-void SCULPT_vertex_color_get(const SculptSession *ss, int index, float r_color[4])
+void SCULPT_vertex_color_get(const SculptSession *ss, PBVHVertRef vertex, float r_color[4])
 {
-  BKE_pbvh_vertex_color_get(ss->pbvh, index, r_color);
+  BKE_pbvh_vertex_color_get(ss->pbvh, vertex, r_color);
 }
 
-void SCULPT_vertex_color_set(SculptSession *ss, int index, const float color[4])
+void SCULPT_vertex_color_set(SculptSession *ss, PBVHVertRef vertex, const float color[4])
 {
-  BKE_pbvh_vertex_color_set(ss->pbvh, index, color);
+  BKE_pbvh_vertex_color_set(ss->pbvh, vertex, color);
 }
 
-void SCULPT_vertex_normal_get(SculptSession *ss, int index, float no[3])
+void SCULPT_vertex_normal_get(SculptSession *ss, PBVHVertRef vertex, float no[3])
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
       const float(*vert_normals)[3] = BKE_pbvh_get_vert_normals(ss->pbvh);
-      copy_v3_v3(no, vert_normals[index]);
+      copy_v3_v3(no, vert_normals[vertex.i]);
       break;
     }
-    case PBVH_BMESH:
-      copy_v3_v3(no, BM_vert_at_index(BKE_pbvh_get_bmesh(ss->pbvh), index)->no);
+    case PBVH_BMESH: {
+      BMVert *v = (BMVert *)vertex.i;
+      copy_v3_v3(no, v->no);
       break;
+    }
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       CCGElem *elem = BKE_pbvh_get_grids(ss->pbvh)[grid_index];
       copy_v3_v3(no, CCG_elem_no(key, CCG_elem_offset(key, elem, vertex_index)));
       break;
@@ -190,42 +192,43 @@ void SCULPT_vertex_normal_get(SculptSession *ss, int index, float no[3])
   }
 }
 
-const float *SCULPT_vertex_persistent_co_get(SculptSession *ss, int index)
+const float *SCULPT_vertex_persistent_co_get(SculptSession *ss, PBVHVertRef vertex)
 {
-  if (ss->persistent_base) {
-    return ss->persistent_base[index].co;
+  if (ss->attrs.persistent_co) {
+    return (const float *)SCULPT_vertex_attr_get(vertex, ss->attrs.persistent_co);
   }
-  return SCULPT_vertex_co_get(ss, index);
+
+  return SCULPT_vertex_co_get(ss, vertex);
 }
 
-const float *SCULPT_vertex_co_for_grab_active_get(SculptSession *ss, int index)
+const float *SCULPT_vertex_co_for_grab_active_get(SculptSession *ss, PBVHVertRef vertex)
 {
-  /* Always grab active shape key if the sculpt happens on shapekey. */
-  if (ss->shapekey_active) {
-    const MVert *mverts = BKE_pbvh_get_verts(ss->pbvh);
-    return mverts[index].co;
-  }
+  if (BKE_pbvh_type(ss->pbvh) == PBVH_FACES) {
+    /* Always grab active shape key if the sculpt happens on shapekey. */
+    if (ss->shapekey_active) {
+      const MVert *mverts = BKE_pbvh_get_verts(ss->pbvh);
+      return mverts[vertex.i].co;
+    }
 
-  /* Sculpting on the base mesh. */
-  if (ss->mvert) {
-    return ss->mvert[index].co;
+    /* Sculpting on the base mesh. */
+    return ss->mvert[vertex.i].co;
   }
 
   /* Everything else, such as sculpting on multires. */
-  return SCULPT_vertex_co_get(ss, index);
+  return SCULPT_vertex_co_get(ss, vertex);
 }
 
-void SCULPT_vertex_limit_surface_get(SculptSession *ss, int index, float r_co[3])
+void SCULPT_vertex_limit_surface_get(SculptSession *ss, PBVHVertRef vertex, float r_co[3])
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
     case PBVH_BMESH:
-      copy_v3_v3(r_co, SCULPT_vertex_co_get(ss, index));
+      copy_v3_v3(r_co, SCULPT_vertex_co_get(ss, vertex));
       break;
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
 
       SubdivCCGCoord coord = {.grid_index = grid_index,
                               .x = vertex_index % key->grid_size,
@@ -236,30 +239,31 @@ void SCULPT_vertex_limit_surface_get(SculptSession *ss, int index, float r_co[3]
   }
 }
 
-void SCULPT_vertex_persistent_normal_get(SculptSession *ss, int index, float no[3])
+void SCULPT_vertex_persistent_normal_get(SculptSession *ss, PBVHVertRef vertex, float no[3])
 {
-  if (ss->persistent_base) {
-    copy_v3_v3(no, ss->persistent_base[index].no);
+  if (ss->attrs.persistent_no) {
+    copy_v3_v3(no, (float *)SCULPT_vertex_attr_get(vertex, ss->attrs.persistent_no));
     return;
   }
-  SCULPT_vertex_normal_get(ss, index, no);
+  SCULPT_vertex_normal_get(ss, vertex, no);
 }
 
-float SCULPT_vertex_mask_get(SculptSession *ss, int index)
+float SCULPT_vertex_mask_get(SculptSession *ss, PBVHVertRef vertex)
 {
-  BMVert *v;
-  float *mask;
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
-      return ss->vmask[index];
-    case PBVH_BMESH:
-      v = BM_vert_at_index(BKE_pbvh_get_bmesh(ss->pbvh), index);
-      mask = BM_ELEM_CD_GET_VOID_P(v, CustomData_get_offset(&ss->bm->vdata, CD_PAINT_MASK));
-      return *mask;
+      return ss->vmask ? ss->vmask[vertex.i] : 0.0f;
+    case PBVH_BMESH: {
+      BMVert *v;
+      int cd_mask = CustomData_get_offset(&ss->bm->vdata, CD_PAINT_MASK);
+
+      v = (BMVert *)vertex.i;
+      return cd_mask != -1 ? BM_ELEM_CD_GET_FLOAT(v, cd_mask) : 0.0f;
+    }
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       CCGElem *elem = BKE_pbvh_get_grids(ss->pbvh)[grid_index];
       return *CCG_elem_mask(key, CCG_elem_offset(key, elem, vertex_index));
     }
@@ -268,12 +272,13 @@ float SCULPT_vertex_mask_get(SculptSession *ss, int index)
   return 0.0f;
 }
 
-int SCULPT_active_vertex_get(SculptSession *ss)
+PBVHVertRef SCULPT_active_vertex_get(SculptSession *ss)
 {
   if (ELEM(BKE_pbvh_type(ss->pbvh), PBVH_FACES, PBVH_BMESH, PBVH_GRIDS)) {
-    return ss->active_vertex_index;
+    return ss->active_vertex;
   }
-  return 0;
+
+  return BKE_pbvh_make_vref(PBVH_REF_NONE);
 }
 
 const float *SCULPT_active_vertex_co_get(SculptSession *ss)
@@ -326,8 +331,14 @@ int SCULPT_active_face_set_get(SculptSession *ss)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
+      if (!ss->face_sets) {
+        return SCULPT_FACE_SET_NONE;
+      }
       return ss->face_sets[ss->active_face_index];
     case PBVH_GRIDS: {
+      if (!ss->face_sets) {
+        return SCULPT_FACE_SET_NONE;
+      }
       const int face_index = BKE_subdiv_ccg_grid_to_face_index(ss->subdiv_ccg,
                                                                ss->active_grid_index);
       return ss->face_sets[face_index];
@@ -338,32 +349,37 @@ int SCULPT_active_face_set_get(SculptSession *ss)
   return SCULPT_FACE_SET_NONE;
 }
 
-void SCULPT_vertex_visible_set(SculptSession *ss, int index, bool visible)
+void SCULPT_vertex_visible_set(SculptSession *ss, PBVHVertRef vertex, bool visible)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
-    case PBVH_FACES:
-      SET_FLAG_FROM_TEST(ss->mvert[index].flag, !visible, ME_HIDE);
-      BKE_pbvh_vert_mark_update(ss->pbvh, index);
+    case PBVH_FACES: {
+      bool *hide_vert = BKE_pbvh_get_vert_hide_for_write(ss->pbvh);
+      hide_vert[vertex.i] = visible;
       break;
-    case PBVH_BMESH:
-      BM_elem_flag_set(BM_vert_at_index(ss->bm, index), BM_ELEM_HIDDEN, !visible);
+    }
+    case PBVH_BMESH: {
+      BMVert *v = (BMVert *)vertex.i;
+      BM_elem_flag_set(v, BM_ELEM_HIDDEN, !visible);
       break;
+    }
     case PBVH_GRIDS:
       break;
   }
 }
 
-bool SCULPT_vertex_visible_get(SculptSession *ss, int index)
+bool SCULPT_vertex_visible_get(SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
-    case PBVH_FACES:
-      return !(ss->mvert[index].flag & ME_HIDE);
+    case PBVH_FACES: {
+      const bool *hide_vert = BKE_pbvh_get_vert_hide(ss->pbvh);
+      return hide_vert == NULL || !hide_vert[vertex.i];
+    }
     case PBVH_BMESH:
-      return !BM_elem_flag_test(BM_vert_at_index(ss->bm, index), BM_ELEM_HIDDEN);
+      return !BM_elem_flag_test((BMVert *)vertex.i, BM_ELEM_HIDDEN);
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       BLI_bitmap **grid_hidden = BKE_pbvh_get_grid_visibility(ss->pbvh);
       if (grid_hidden && grid_hidden[grid_index]) {
         return !BLI_BITMAP_TEST(grid_hidden[grid_index], vertex_index);
@@ -375,19 +391,16 @@ bool SCULPT_vertex_visible_get(SculptSession *ss, int index)
 
 void SCULPT_face_set_visibility_set(SculptSession *ss, int face_set, bool visible)
 {
+  BLI_assert(ss->face_sets != NULL);
+  BLI_assert(ss->hide_poly != NULL);
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
     case PBVH_GRIDS:
       for (int i = 0; i < ss->totfaces; i++) {
-        if (abs(ss->face_sets[i]) != face_set) {
+        if (ss->face_sets[i] != face_set) {
           continue;
         }
-        if (visible) {
-          ss->face_sets[i] = abs(ss->face_sets[i]);
-        }
-        else {
-          ss->face_sets[i] = -abs(ss->face_sets[i]);
-        }
+        ss->hide_poly[i] = !visible;
       }
       break;
     case PBVH_BMESH:
@@ -395,13 +408,15 @@ void SCULPT_face_set_visibility_set(SculptSession *ss, int face_set, bool visibl
   }
 }
 
-void SCULPT_face_sets_visibility_invert(SculptSession *ss)
+void SCULPT_face_visibility_all_invert(SculptSession *ss)
 {
+  BLI_assert(ss->face_sets != NULL);
+  BLI_assert(ss->hide_poly != NULL);
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
     case PBVH_GRIDS:
       for (int i = 0; i < ss->totfaces; i++) {
-        ss->face_sets[i] *= -1;
+        ss->hide_poly[i] = !ss->hide_poly[i];
       }
       break;
     case PBVH_BMESH:
@@ -409,40 +424,29 @@ void SCULPT_face_sets_visibility_invert(SculptSession *ss)
   }
 }
 
-void SCULPT_face_sets_visibility_all_set(SculptSession *ss, bool visible)
+void SCULPT_face_visibility_all_set(SculptSession *ss, bool visible)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
     case PBVH_GRIDS:
-      for (int i = 0; i < ss->totfaces; i++) {
-
-        /* This can run on geometry without a face set assigned, so its ID sign can't be changed to
-         * modify the visibility. Force that geometry to the ID 1 to enable changing the visibility
-         * here. */
-        if (ss->face_sets[i] == SCULPT_FACE_SET_NONE) {
-          ss->face_sets[i] = 1;
-        }
-
-        if (visible) {
-          ss->face_sets[i] = abs(ss->face_sets[i]);
-        }
-        else {
-          ss->face_sets[i] = -abs(ss->face_sets[i]);
-        }
-      }
+      BLI_assert(ss->hide_poly != NULL);
+      memset(ss->hide_poly, !visible, sizeof(bool) * ss->totfaces);
       break;
     case PBVH_BMESH:
       break;
   }
 }
 
-bool SCULPT_vertex_any_face_set_visible_get(SculptSession *ss, int index)
+bool SCULPT_vertex_any_face_visible_get(SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      MeshElemMap *vert_map = &ss->pmap[index];
-      for (int j = 0; j < ss->pmap[index].count; j++) {
-        if (ss->face_sets[vert_map->indices[j]] > 0) {
+      if (!ss->hide_poly) {
+        return true;
+      }
+      MeshElemMap *vert_map = &ss->pmap[vertex.i];
+      for (int j = 0; j < ss->pmap[vertex.i].count; j++) {
+        if (!ss->hide_poly[vert_map->indices[j]]) {
           return true;
         }
       }
@@ -456,13 +460,16 @@ bool SCULPT_vertex_any_face_set_visible_get(SculptSession *ss, int index)
   return true;
 }
 
-bool SCULPT_vertex_all_face_sets_visible_get(const SculptSession *ss, int index)
+bool SCULPT_vertex_all_faces_visible_get(const SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      MeshElemMap *vert_map = &ss->pmap[index];
-      for (int j = 0; j < ss->pmap[index].count; j++) {
-        if (ss->face_sets[vert_map->indices[j]] < 0) {
+      if (!ss->hide_poly) {
+        return true;
+      }
+      MeshElemMap *vert_map = &ss->pmap[vertex.i];
+      for (int j = 0; j < ss->pmap[vertex.i].count; j++) {
+        if (ss->hide_poly[vert_map->indices[j]]) {
           return false;
         }
       }
@@ -471,47 +478,61 @@ bool SCULPT_vertex_all_face_sets_visible_get(const SculptSession *ss, int index)
     case PBVH_BMESH:
       return true;
     case PBVH_GRIDS: {
+      if (!ss->hide_poly) {
+        return true;
+      }
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
       const int face_index = BKE_subdiv_ccg_grid_to_face_index(ss->subdiv_ccg, grid_index);
-      return ss->face_sets[face_index] > 0;
+      return !ss->hide_poly[face_index];
     }
   }
   return true;
 }
 
-void SCULPT_vertex_face_set_set(SculptSession *ss, int index, int face_set)
+void SCULPT_vertex_face_set_set(SculptSession *ss, PBVHVertRef vertex, int face_set)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      MeshElemMap *vert_map = &ss->pmap[index];
-      for (int j = 0; j < ss->pmap[index].count; j++) {
-        if (ss->face_sets[vert_map->indices[j]] > 0) {
-          ss->face_sets[vert_map->indices[j]] = abs(face_set);
+      BLI_assert(ss->face_sets != NULL);
+      MeshElemMap *vert_map = &ss->pmap[vertex.i];
+      for (int j = 0; j < ss->pmap[vertex.i].count; j++) {
+        const int poly_index = vert_map->indices[j];
+        if (ss->hide_poly && ss->hide_poly[poly_index]) {
+          /* Skip hidden faces connected to the vertex. */
+          continue;
         }
+        ss->face_sets[poly_index] = face_set;
       }
-    } break;
+      break;
+    }
     case PBVH_BMESH:
       break;
     case PBVH_GRIDS: {
+      BLI_assert(ss->face_sets != NULL);
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
       const int face_index = BKE_subdiv_ccg_grid_to_face_index(ss->subdiv_ccg, grid_index);
-      if (ss->face_sets[face_index] > 0) {
-        ss->face_sets[face_index] = abs(face_set);
+      if (ss->hide_poly && ss->hide_poly[face_index]) {
+        /* Skip the vertex if it's in a hidden face. */
+        return;
       }
-
-    } break;
+      ss->face_sets[face_index] = face_set;
+      break;
+    }
   }
 }
 
-int SCULPT_vertex_face_set_get(SculptSession *ss, int index)
+int SCULPT_vertex_face_set_get(SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      MeshElemMap *vert_map = &ss->pmap[index];
+      if (!ss->face_sets) {
+        return SCULPT_FACE_SET_NONE;
+      }
+      MeshElemMap *vert_map = &ss->pmap[vertex.i];
       int face_set = 0;
-      for (int i = 0; i < ss->pmap[index].count; i++) {
+      for (int i = 0; i < ss->pmap[vertex.i].count; i++) {
         if (ss->face_sets[vert_map->indices[i]] > face_set) {
           face_set = abs(ss->face_sets[vert_map->indices[i]]);
         }
@@ -521,8 +542,11 @@ int SCULPT_vertex_face_set_get(SculptSession *ss, int index)
     case PBVH_BMESH:
       return 0;
     case PBVH_GRIDS: {
+      if (!ss->face_sets) {
+        return SCULPT_FACE_SET_NONE;
+      }
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
       const int face_index = BKE_subdiv_ccg_grid_to_face_index(ss->subdiv_ccg, grid_index);
       return ss->face_sets[face_index];
     }
@@ -530,12 +554,15 @@ int SCULPT_vertex_face_set_get(SculptSession *ss, int index)
   return 0;
 }
 
-bool SCULPT_vertex_has_face_set(SculptSession *ss, int index, int face_set)
+bool SCULPT_vertex_has_face_set(SculptSession *ss, PBVHVertRef vertex, int face_set)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      MeshElemMap *vert_map = &ss->pmap[index];
-      for (int i = 0; i < ss->pmap[index].count; i++) {
+      if (!ss->face_sets) {
+        return face_set == SCULPT_FACE_SET_NONE;
+      }
+      MeshElemMap *vert_map = &ss->pmap[vertex.i];
+      for (int i = 0; i < ss->pmap[vertex.i].count; i++) {
         if (ss->face_sets[vert_map->indices[i]] == face_set) {
           return true;
         }
@@ -545,8 +572,11 @@ bool SCULPT_vertex_has_face_set(SculptSession *ss, int index, int face_set)
     case PBVH_BMESH:
       return true;
     case PBVH_GRIDS: {
+      if (!ss->face_sets) {
+        return face_set == SCULPT_FACE_SET_NONE;
+      }
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
       const int face_index = BKE_subdiv_ccg_grid_to_face_index(ss->subdiv_ccg, grid_index);
       return ss->face_sets[face_index] == face_set;
     }
@@ -554,18 +584,23 @@ bool SCULPT_vertex_has_face_set(SculptSession *ss, int index, int face_set)
   return true;
 }
 
-void SCULPT_visibility_sync_all_face_sets_to_vertices(Object *ob)
+void SCULPT_visibility_sync_all_from_faces(Object *ob)
 {
   SculptSession *ss = ob->sculpt;
   Mesh *mesh = BKE_object_get_original_mesh(ob);
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      BKE_sculpt_sync_face_sets_visibility_to_base_mesh(mesh);
+      /* We may have adjusted the ".hide_poly" attribute, now make the hide status attributes for
+       * vertices and edges consistent. */
+      BKE_mesh_flush_hidden_from_polys(mesh);
+      BKE_pbvh_update_hide_attributes_from_mesh(ss->pbvh);
       break;
     }
     case PBVH_GRIDS: {
-      BKE_sculpt_sync_face_sets_visibility_to_base_mesh(mesh);
-      BKE_sculpt_sync_face_sets_visibility_to_grids(mesh, ss->subdiv_ccg);
+      /* In addition to making the hide status of the base mesh consistent, we also have to
+       * propagate the status to the Multires grids. */
+      BKE_mesh_flush_hidden_from_polys(mesh);
+      BKE_sculpt_sync_face_visibility_to_grids(mesh, ss->subdiv_ccg);
       break;
     }
     case PBVH_BMESH:
@@ -573,54 +608,19 @@ void SCULPT_visibility_sync_all_face_sets_to_vertices(Object *ob)
   }
 }
 
-static void UNUSED_FUNCTION(sculpt_visibility_sync_vertex_to_face_sets)(SculptSession *ss,
-                                                                        int index)
-{
-  MeshElemMap *vert_map = &ss->pmap[index];
-  const bool visible = SCULPT_vertex_visible_get(ss, index);
-  for (int i = 0; i < ss->pmap[index].count; i++) {
-    if (visible) {
-      ss->face_sets[vert_map->indices[i]] = abs(ss->face_sets[vert_map->indices[i]]);
-    }
-    else {
-      ss->face_sets[vert_map->indices[i]] = -abs(ss->face_sets[vert_map->indices[i]]);
-    }
-  }
-  BKE_pbvh_vert_mark_update(ss->pbvh, index);
-}
-
-void SCULPT_visibility_sync_all_vertex_to_face_sets(SculptSession *ss)
-{
-  if (BKE_pbvh_type(ss->pbvh) == PBVH_FACES) {
-    for (int i = 0; i < ss->totfaces; i++) {
-      MPoly *poly = &ss->mpoly[i];
-      bool poly_visible = true;
-      for (int l = 0; l < poly->totloop; l++) {
-        MLoop *loop = &ss->mloop[poly->loopstart + l];
-        if (!SCULPT_vertex_visible_get(ss, (int)loop->v)) {
-          poly_visible = false;
-        }
-      }
-      if (poly_visible) {
-        ss->face_sets[i] = abs(ss->face_sets[i]);
-      }
-      else {
-        ss->face_sets[i] = -abs(ss->face_sets[i]);
-      }
-    }
-  }
-}
-
 static bool sculpt_check_unique_face_set_in_base_mesh(SculptSession *ss, int index)
 {
+  if (!ss->face_sets) {
+    return true;
+  }
   MeshElemMap *vert_map = &ss->pmap[index];
   int face_set = -1;
   for (int i = 0; i < ss->pmap[index].count; i++) {
     if (face_set == -1) {
-      face_set = abs(ss->face_sets[vert_map->indices[i]]);
+      face_set = ss->face_sets[vert_map->indices[i]];
     }
     else {
-      if (abs(ss->face_sets[vert_map->indices[i]]) != face_set) {
+      if (ss->face_sets[vert_map->indices[i]] != face_set) {
         return false;
       }
     }
@@ -637,9 +637,9 @@ static bool sculpt_check_unique_face_set_for_edge_in_base_mesh(SculptSession *ss
   MeshElemMap *vert_map = &ss->pmap[v1];
   int p1 = -1, p2 = -1;
   for (int i = 0; i < ss->pmap[v1].count; i++) {
-    MPoly *p = &ss->mpoly[vert_map->indices[i]];
+    const MPoly *p = &ss->mpoly[vert_map->indices[i]];
     for (int l = 0; l < p->totloop; l++) {
-      MLoop *loop = &ss->mloop[p->loopstart + l];
+      const MLoop *loop = &ss->mloop[p->loopstart + l];
       if (loop->v == v2) {
         if (p1 == -1) {
           p1 = vert_map->indices[i];
@@ -660,18 +660,21 @@ static bool sculpt_check_unique_face_set_for_edge_in_base_mesh(SculptSession *ss
   return true;
 }
 
-bool SCULPT_vertex_has_unique_face_set(SculptSession *ss, int index)
+bool SCULPT_vertex_has_unique_face_set(SculptSession *ss, PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      return sculpt_check_unique_face_set_in_base_mesh(ss, index);
+      return sculpt_check_unique_face_set_in_base_mesh(ss, vertex.i);
     }
     case PBVH_BMESH:
       return true;
     case PBVH_GRIDS: {
+      if (!ss->face_sets) {
+        return true;
+      }
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       const SubdivCCGCoord coord = {.grid_index = grid_index,
                                     .x = vertex_index % key->grid_size,
                                     .y = vertex_index / key->grid_size};
@@ -696,10 +699,13 @@ int SCULPT_face_set_next_available_get(SculptSession *ss)
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
     case PBVH_GRIDS: {
+      if (!ss->face_sets) {
+        return 0;
+      }
       int next_face_set = 0;
       for (int i = 0; i < ss->totfaces; i++) {
-        if (abs(ss->face_sets[i]) > next_face_set) {
-          next_face_set = abs(ss->face_sets[i]);
+        if (ss->face_sets[i] > next_face_set) {
+          next_face_set = ss->face_sets[i];
         }
       }
       next_face_set++;
@@ -715,10 +721,12 @@ int SCULPT_face_set_next_available_get(SculptSession *ss)
 
 #define SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY 256
 
-static void sculpt_vertex_neighbor_add(SculptVertexNeighborIter *iter, int neighbor_index)
+static void sculpt_vertex_neighbor_add(SculptVertexNeighborIter *iter,
+                                       PBVHVertRef neighbor,
+                                       int neighbor_index)
 {
   for (int i = 0; i < iter->size; i++) {
-    if (iter->neighbors[i] == neighbor_index) {
+    if (iter->neighbors[i].i == neighbor.i) {
       return;
     }
   }
@@ -727,63 +735,75 @@ static void sculpt_vertex_neighbor_add(SculptVertexNeighborIter *iter, int neigh
     iter->capacity += SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY;
 
     if (iter->neighbors == iter->neighbors_fixed) {
-      iter->neighbors = MEM_mallocN(iter->capacity * sizeof(int), "neighbor array");
-      memcpy(iter->neighbors, iter->neighbors_fixed, sizeof(int) * iter->size);
+      iter->neighbors = MEM_mallocN(iter->capacity * sizeof(PBVHVertRef), "neighbor array");
+      memcpy(iter->neighbors, iter->neighbors_fixed, sizeof(PBVHVertRef) * iter->size);
     }
     else {
       iter->neighbors = MEM_reallocN_id(
-          iter->neighbors, iter->capacity * sizeof(int), "neighbor array");
+          iter->neighbors, iter->capacity * sizeof(PBVHVertRef), "neighbor array");
+    }
+
+    if (iter->neighbor_indices == iter->neighbor_indices_fixed) {
+      iter->neighbor_indices = MEM_mallocN(iter->capacity * sizeof(int), "neighbor array");
+      memcpy(iter->neighbor_indices, iter->neighbor_indices_fixed, sizeof(int) * iter->size);
+    }
+    else {
+      iter->neighbor_indices = MEM_reallocN_id(
+          iter->neighbor_indices, iter->capacity * sizeof(int), "neighbor array");
     }
   }
 
-  iter->neighbors[iter->size] = neighbor_index;
+  iter->neighbors[iter->size] = neighbor;
+  iter->neighbor_indices[iter->size] = neighbor_index;
   iter->size++;
 }
 
-static void sculpt_vertex_neighbors_get_bmesh(SculptSession *ss,
-                                              int index,
-                                              SculptVertexNeighborIter *iter)
+static void sculpt_vertex_neighbors_get_bmesh(PBVHVertRef vertex, SculptVertexNeighborIter *iter)
 {
-  BMVert *v = BM_vert_at_index(ss->bm, index);
+  BMVert *v = (BMVert *)vertex.i;
   BMIter liter;
   BMLoop *l;
   iter->size = 0;
   iter->num_duplicates = 0;
   iter->capacity = SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY;
   iter->neighbors = iter->neighbors_fixed;
+  iter->neighbor_indices = iter->neighbor_indices_fixed;
 
   BM_ITER_ELEM (l, &liter, v, BM_LOOPS_OF_VERT) {
     const BMVert *adj_v[2] = {l->prev->v, l->next->v};
     for (int i = 0; i < ARRAY_SIZE(adj_v); i++) {
       const BMVert *v_other = adj_v[i];
-      if (BM_elem_index_get(v_other) != (int)index) {
-        sculpt_vertex_neighbor_add(iter, BM_elem_index_get(v_other));
+      if (v_other != v) {
+        sculpt_vertex_neighbor_add(
+            iter, BKE_pbvh_make_vref((intptr_t)v_other), BM_elem_index_get(v_other));
       }
     }
   }
 }
 
 static void sculpt_vertex_neighbors_get_faces(SculptSession *ss,
-                                              int index,
+                                              PBVHVertRef vertex,
                                               SculptVertexNeighborIter *iter)
 {
-  MeshElemMap *vert_map = &ss->pmap[index];
+  MeshElemMap *vert_map = &ss->pmap[vertex.i];
   iter->size = 0;
   iter->num_duplicates = 0;
   iter->capacity = SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY;
   iter->neighbors = iter->neighbors_fixed;
+  iter->neighbor_indices = iter->neighbor_indices_fixed;
+  const bool *hide_poly = BKE_pbvh_get_vert_hide(ss->pbvh);
 
-  for (int i = 0; i < ss->pmap[index].count; i++) {
-    if (ss->face_sets[vert_map->indices[i]] < 0) {
+  for (int i = 0; i < ss->pmap[vertex.i].count; i++) {
+    if (hide_poly && hide_poly[vert_map->indices[i]]) {
       /* Skip connectivity from hidden faces. */
       continue;
     }
     const MPoly *p = &ss->mpoly[vert_map->indices[i]];
     uint f_adj_v[2];
-    if (poly_get_adj_loops_from_vert(p, ss->mloop, index, f_adj_v) != -1) {
+    if (poly_get_adj_loops_from_vert(p, ss->mloop, vertex.i, f_adj_v) != -1) {
       for (int j = 0; j < ARRAY_SIZE(f_adj_v); j += 1) {
-        if (f_adj_v[j] != index) {
-          sculpt_vertex_neighbor_add(iter, f_adj_v[j]);
+        if (f_adj_v[j] != vertex.i) {
+          sculpt_vertex_neighbor_add(iter, BKE_pbvh_make_vref(f_adj_v[j]), f_adj_v[j]);
         }
       }
     }
@@ -791,14 +811,17 @@ static void sculpt_vertex_neighbors_get_faces(SculptSession *ss,
 
   if (ss->fake_neighbors.use_fake_neighbors) {
     BLI_assert(ss->fake_neighbors.fake_neighbor_index != NULL);
-    if (ss->fake_neighbors.fake_neighbor_index[index] != FAKE_NEIGHBOR_NONE) {
-      sculpt_vertex_neighbor_add(iter, ss->fake_neighbors.fake_neighbor_index[index]);
+    if (ss->fake_neighbors.fake_neighbor_index[vertex.i] != FAKE_NEIGHBOR_NONE) {
+      sculpt_vertex_neighbor_add(
+          iter,
+          BKE_pbvh_make_vref(ss->fake_neighbors.fake_neighbor_index[vertex.i]),
+          ss->fake_neighbors.fake_neighbor_index[vertex.i]);
     }
   }
 }
 
 static void sculpt_vertex_neighbors_get_grids(SculptSession *ss,
-                                              const int index,
+                                              const PBVHVertRef vertex,
                                               const bool include_duplicates,
                                               SculptVertexNeighborIter *iter)
 {
@@ -806,8 +829,8 @@ static void sculpt_vertex_neighbors_get_grids(SculptSession *ss,
    * maybe provide coordinate and mask pointers directly rather than converting
    * back and forth between #CCGElem and global index. */
   const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-  const int grid_index = index / key->grid_area;
-  const int vertex_index = index - grid_index * key->grid_area;
+  const int grid_index = vertex.i / key->grid_area;
+  const int vertex_index = vertex.i - grid_index * key->grid_area;
 
   SubdivCCGCoord coord = {.grid_index = grid_index,
                           .x = vertex_index % key->grid_size,
@@ -820,17 +843,20 @@ static void sculpt_vertex_neighbors_get_grids(SculptSession *ss,
   iter->num_duplicates = neighbors.num_duplicates;
   iter->capacity = SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY;
   iter->neighbors = iter->neighbors_fixed;
+  iter->neighbor_indices = iter->neighbor_indices_fixed;
 
   for (int i = 0; i < neighbors.size; i++) {
-    sculpt_vertex_neighbor_add(iter,
-                               neighbors.coords[i].grid_index * key->grid_area +
-                                   neighbors.coords[i].y * key->grid_size + neighbors.coords[i].x);
+    int v = neighbors.coords[i].grid_index * key->grid_area +
+            neighbors.coords[i].y * key->grid_size + neighbors.coords[i].x;
+
+    sculpt_vertex_neighbor_add(iter, BKE_pbvh_make_vref(v), v);
   }
 
   if (ss->fake_neighbors.use_fake_neighbors) {
     BLI_assert(ss->fake_neighbors.fake_neighbor_index != NULL);
-    if (ss->fake_neighbors.fake_neighbor_index[index] != FAKE_NEIGHBOR_NONE) {
-      sculpt_vertex_neighbor_add(iter, ss->fake_neighbors.fake_neighbor_index[index]);
+    if (ss->fake_neighbors.fake_neighbor_index[vertex.i] != FAKE_NEIGHBOR_NONE) {
+      int v = ss->fake_neighbors.fake_neighbor_index[vertex.i];
+      sculpt_vertex_neighbor_add(iter, BKE_pbvh_make_vref(v), v);
     }
   }
 
@@ -840,19 +866,19 @@ static void sculpt_vertex_neighbors_get_grids(SculptSession *ss,
 }
 
 void SCULPT_vertex_neighbors_get(SculptSession *ss,
-                                 const int index,
+                                 const PBVHVertRef vertex,
                                  const bool include_duplicates,
                                  SculptVertexNeighborIter *iter)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
-      sculpt_vertex_neighbors_get_faces(ss, index, iter);
+      sculpt_vertex_neighbors_get_faces(ss, vertex, iter);
       return;
     case PBVH_BMESH:
-      sculpt_vertex_neighbors_get_bmesh(ss, index, iter);
+      sculpt_vertex_neighbors_get_bmesh(vertex, iter);
       return;
     case PBVH_GRIDS:
-      sculpt_vertex_neighbors_get_grids(ss, index, include_duplicates, iter);
+      sculpt_vertex_neighbors_get_grids(ss, vertex, include_duplicates, iter);
       return;
   }
 }
@@ -863,24 +889,24 @@ static bool sculpt_check_boundary_vertex_in_base_mesh(const SculptSession *ss, c
   return BLI_BITMAP_TEST(ss->vertex_info.boundary, index);
 }
 
-bool SCULPT_vertex_is_boundary(const SculptSession *ss, const int index)
+bool SCULPT_vertex_is_boundary(const SculptSession *ss, const PBVHVertRef vertex)
 {
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES: {
-      if (!SCULPT_vertex_all_face_sets_visible_get(ss, index)) {
+      if (!SCULPT_vertex_all_faces_visible_get(ss, vertex)) {
         return true;
       }
-      return sculpt_check_boundary_vertex_in_base_mesh(ss, index);
+      return sculpt_check_boundary_vertex_in_base_mesh(ss, vertex.i);
     }
     case PBVH_BMESH: {
-      BMVert *v = BM_vert_at_index(ss->bm, index);
+      BMVert *v = (BMVert *)vertex.i;
       return BM_vert_is_boundary(v);
     }
 
     case PBVH_GRIDS: {
       const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
-      const int grid_index = index / key->grid_area;
-      const int vertex_index = index - grid_index * key->grid_area;
+      const int grid_index = vertex.i / key->grid_area;
+      const int vertex_index = vertex.i - grid_index * key->grid_area;
       const SubdivCCGCoord coord = {.grid_index = grid_index,
                                     .x = vertex_index % key->grid_size,
                                     .y = vertex_index / key->grid_size};
@@ -941,7 +967,7 @@ bool SCULPT_check_vertex_pivot_symmetry(const float vco[3], const float pco[3],
 }
 
 typedef struct NearestVertexTLSData {
-  int nearest_vertex_index;
+  PBVHVertRef nearest_vertex;
   float nearest_vertex_distance_squared;
 } NearestVertexTLSData;
 
@@ -958,7 +984,7 @@ static void do_nearest_vertex_get_task_cb(void *__restrict userdata,
     float distance_squared = len_squared_v3v3(vd.co, data->nearest_vertex_search_co);
     if (distance_squared < nvtd->nearest_vertex_distance_squared &&
         distance_squared < data->max_distance_squared) {
-      nvtd->nearest_vertex_index = vd.index;
+      nvtd->nearest_vertex = vd.vertex;
       nvtd->nearest_vertex_distance_squared = distance_squared;
     }
   }
@@ -971,17 +997,17 @@ static void nearest_vertex_get_reduce(const void *__restrict UNUSED(userdata),
 {
   NearestVertexTLSData *join = chunk_join;
   NearestVertexTLSData *nvtd = chunk;
-  if (join->nearest_vertex_index == -1) {
-    join->nearest_vertex_index = nvtd->nearest_vertex_index;
+  if (join->nearest_vertex.i == PBVH_REF_NONE) {
+    join->nearest_vertex = nvtd->nearest_vertex;
     join->nearest_vertex_distance_squared = nvtd->nearest_vertex_distance_squared;
   }
   else if (nvtd->nearest_vertex_distance_squared < join->nearest_vertex_distance_squared) {
-    join->nearest_vertex_index = nvtd->nearest_vertex_index;
+    join->nearest_vertex = nvtd->nearest_vertex;
     join->nearest_vertex_distance_squared = nvtd->nearest_vertex_distance_squared;
   }
 }
 
-int SCULPT_nearest_vertex_get(
+PBVHVertRef SCULPT_nearest_vertex_get(
     Sculpt *sd, Object *ob, const float co[3], float max_distance, bool use_original)
 {
   SculptSession *ss = ob->sculpt;
@@ -996,7 +1022,7 @@ int SCULPT_nearest_vertex_get(
   };
   BKE_pbvh_search_gather(ss->pbvh, SCULPT_search_sphere_cb, &data, &nodes, &totnode);
   if (totnode == 0) {
-    return -1;
+    return BKE_pbvh_make_vref(PBVH_REF_NONE);
   }
 
   SculptThreadedTaskData task_data = {
@@ -1008,7 +1034,7 @@ int SCULPT_nearest_vertex_get(
 
   copy_v3_v3(task_data.nearest_vertex_search_co, co);
   NearestVertexTLSData nvtd;
-  nvtd.nearest_vertex_index = -1;
+  nvtd.nearest_vertex.i = PBVH_REF_NONE;
   nvtd.nearest_vertex_distance_squared = FLT_MAX;
 
   TaskParallelSettings settings;
@@ -1020,7 +1046,7 @@ int SCULPT_nearest_vertex_get(
 
   MEM_SAFE_FREE(nodes);
 
-  return nvtd.nearest_vertex_index;
+  return nvtd.nearest_vertex;
 }
 
 bool SCULPT_is_symmetry_iteration_valid(char i, char symm)
@@ -1075,23 +1101,27 @@ void SCULPT_floodfill_init(SculptSession *ss, SculptFloodFill *flood)
   int vertex_count = SCULPT_vertex_count_get(ss);
   SCULPT_vertex_random_access_ensure(ss);
 
-  flood->queue = BLI_gsqueue_new(sizeof(int));
-  flood->visited_vertices = BLI_BITMAP_NEW(vertex_count, "visited vertices");
+  flood->queue = BLI_gsqueue_new(sizeof(intptr_t));
+  flood->visited_verts = BLI_BITMAP_NEW(vertex_count, "visited verts");
 }
 
-void SCULPT_floodfill_add_initial(SculptFloodFill *flood, int index)
+void SCULPT_floodfill_add_initial(SculptFloodFill *flood, PBVHVertRef vertex)
 {
-  BLI_gsqueue_push(flood->queue, &index);
+  BLI_gsqueue_push(flood->queue, &vertex);
 }
 
-void SCULPT_floodfill_add_and_skip_initial(SculptFloodFill *flood, int index)
+void SCULPT_floodfill_add_and_skip_initial(SculptFloodFill *flood, PBVHVertRef vertex)
 {
-  BLI_gsqueue_push(flood->queue, &index);
-  BLI_BITMAP_ENABLE(flood->visited_vertices, index);
+  BLI_gsqueue_push(flood->queue, &vertex);
+  BLI_BITMAP_ENABLE(flood->visited_verts, vertex.i);
 }
 
-void SCULPT_floodfill_add_initial_with_symmetry(
-    Sculpt *sd, Object *ob, SculptSession *ss, SculptFloodFill *flood, int index, float radius)
+void SCULPT_floodfill_add_initial_with_symmetry(Sculpt *sd,
+                                                Object *ob,
+                                                SculptSession *ss,
+                                                SculptFloodFill *flood,
+                                                PBVHVertRef vertex,
+                                                float radius)
 {
   /* Add active vertex and symmetric vertices to the queue. */
   const char symm = SCULPT_mesh_symmetry_xyz_get(ob);
@@ -1099,18 +1129,19 @@ void SCULPT_floodfill_add_initial_with_symmetry(
     if (!SCULPT_is_symmetry_iteration_valid(i, symm)) {
       continue;
     }
-    int v = -1;
+    PBVHVertRef v = {PBVH_REF_NONE};
+
     if (i == 0) {
-      v = index;
+      v = vertex;
     }
     else if (radius > 0.0f) {
       float radius_squared = (radius == FLT_MAX) ? FLT_MAX : radius * radius;
       float location[3];
-      flip_v3_v3(location, SCULPT_vertex_co_get(ss, index), i);
+      flip_v3_v3(location, SCULPT_vertex_co_get(ss, vertex), i);
       v = SCULPT_nearest_vertex_get(sd, ob, location, radius_squared, false);
     }
 
-    if (v != -1) {
+    if (v.i != PBVH_REF_NONE) {
       SCULPT_floodfill_add_initial(flood, v);
     }
   }
@@ -1125,7 +1156,9 @@ void SCULPT_floodfill_add_active(
     if (!SCULPT_is_symmetry_iteration_valid(i, symm)) {
       continue;
     }
-    int v = -1;
+
+    PBVHVertRef v = {PBVH_REF_NONE};
+
     if (i == 0) {
       v = SCULPT_active_vertex_get(ss);
     }
@@ -1135,26 +1168,31 @@ void SCULPT_floodfill_add_active(
       v = SCULPT_nearest_vertex_get(sd, ob, location, radius, false);
     }
 
-    if (v != -1) {
+    if (v.i != PBVH_REF_NONE) {
       SCULPT_floodfill_add_initial(flood, v);
     }
   }
 }
 
-void SCULPT_floodfill_execute(
-    SculptSession *ss,
-    SculptFloodFill *flood,
-    bool (*func)(SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata),
-    void *userdata)
+void SCULPT_floodfill_execute(SculptSession *ss,
+                              SculptFloodFill *flood,
+                              bool (*func)(SculptSession *ss,
+                                           PBVHVertRef from_v,
+                                           PBVHVertRef to_v,
+                                           bool is_duplicate,
+                                           void *userdata),
+                              void *userdata)
 {
   while (!BLI_gsqueue_is_empty(flood->queue)) {
-    int from_v;
+    PBVHVertRef from_v;
+
     BLI_gsqueue_pop(flood->queue, &from_v);
     SculptVertexNeighborIter ni;
     SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, from_v, ni) {
-      const int to_v = ni.index;
+      const PBVHVertRef to_v = ni.vertex;
+      int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
 
-      if (BLI_BITMAP_TEST(flood->visited_vertices, to_v)) {
+      if (BLI_BITMAP_TEST(flood->visited_verts, to_v_i)) {
         continue;
       }
 
@@ -1162,7 +1200,7 @@ void SCULPT_floodfill_execute(
         continue;
       }
 
-      BLI_BITMAP_ENABLE(flood->visited_vertices, to_v);
+      BLI_BITMAP_ENABLE(flood->visited_verts, BKE_pbvh_vertex_to_index(ss->pbvh, to_v));
 
       if (func(ss, from_v, to_v, ni.is_duplicate, userdata)) {
         BLI_gsqueue_push(flood->queue, &to_v);
@@ -1174,7 +1212,7 @@ void SCULPT_floodfill_execute(
 
 void SCULPT_floodfill_free(SculptFloodFill *flood)
 {
-  MEM_SAFE_FREE(flood->visited_vertices);
+  MEM_SAFE_FREE(flood->visited_verts);
   BLI_gsqueue_free(flood->queue);
   flood->queue = NULL;
 }
@@ -1368,16 +1406,13 @@ static void paint_mesh_restore_co_task_cb(void *__restrict userdata,
   switch (data->brush->sculpt_tool) {
     case SCULPT_TOOL_MASK:
       type = SCULPT_UNDO_MASK;
-      BKE_pbvh_node_mark_update_mask(data->nodes[n]);
       break;
     case SCULPT_TOOL_PAINT:
     case SCULPT_TOOL_SMEAR:
       type = SCULPT_UNDO_COLOR;
-      BKE_pbvh_node_mark_update_color(data->nodes[n]);
       break;
     default:
       type = SCULPT_UNDO_COORDS;
-      BKE_pbvh_node_mark_update(data->nodes[n]);
       break;
   }
 
@@ -1392,6 +1427,20 @@ static void paint_mesh_restore_co_task_cb(void *__restrict userdata,
     return;
   }
 
+  switch (type) {
+    case SCULPT_UNDO_MASK:
+      BKE_pbvh_node_mark_update_mask(data->nodes[n]);
+      break;
+    case SCULPT_UNDO_COLOR:
+      BKE_pbvh_node_mark_update_color(data->nodes[n]);
+      break;
+    case SCULPT_UNDO_COORDS:
+      BKE_pbvh_node_mark_update(data->nodes[n]);
+      break;
+    default:
+      break;
+  }
+
   PBVHVertexIter vd;
   SculptOrigVertData orig_data;
 
@@ -1408,16 +1457,15 @@ static void paint_mesh_restore_co_task_cb(void *__restrict userdata,
       else {
         copy_v3_v3(vd.fno, orig_data.no);
       }
+      if (vd.mvert) {
+        BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
+      }
     }
     else if (orig_data.unode->type == SCULPT_UNDO_MASK) {
       *vd.mask = orig_data.mask;
     }
     else if (orig_data.unode->type == SCULPT_UNDO_COLOR) {
-      SCULPT_vertex_color_set(ss, vd.index, orig_data.col);
-    }
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      SCULPT_vertex_color_set(ss, vd.vertex, orig_data.col);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2361,12 +2409,12 @@ static float brush_strength(const Sculpt *sd,
 float SCULPT_brush_strength_factor(SculptSession *ss,
                                    const Brush *br,
                                    const float brush_point[3],
-                                   const float len,
+                                   float len,
                                    const float vno[3],
                                    const float fno[3],
-                                   const float mask,
-                                   const int vertex_index,
-                                   const int thread_id)
+                                   float mask,
+                                   const PBVHVertRef vertex,
+                                   int thread_id)
 {
   StrokeCache *cache = ss->cache;
   const Scene *scene = cache->vc->scene;
@@ -2450,7 +2498,7 @@ float SCULPT_brush_strength_factor(SculptSession *ss,
   avg *= 1.0f - mask;
 
   /* Auto-masking. */
-  avg *= SCULPT_automasking_factor_get(cache->automasking, ss, vertex_index);
+  avg *= SCULPT_automasking_factor_get(cache->automasking, ss, vertex);
 
   return avg;
 }
@@ -2819,7 +2867,7 @@ typedef struct {
   float depth;
   bool original;
 
-  int active_vertex_index;
+  PBVHVertRef active_vertex;
   float *face_normal;
 
   int active_face_grid_index;
@@ -3039,13 +3087,13 @@ static void do_gravity_task_cb_ex(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     mul_v3_v3fl(proxy[vd.i], offset, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -3114,10 +3162,10 @@ void SCULPT_vertcos_to_key(Object *ob, KeyBlock *kb, const float (*vertCos)[3])
 
   /* Modifying of basis key should update mesh. */
   if (kb == me->key->refkey) {
-    MVert *mvert = me->mvert;
+    MVert *verts = BKE_mesh_verts_for_write(me);
 
-    for (a = 0; a < me->totvert; a++, mvert++) {
-      copy_v3_v3(mvert->co, vertCos[a]);
+    for (a = 0; a < me->totvert; a++) {
+      copy_v3_v3(verts[a].co, vertCos[a]);
     }
     BKE_mesh_tag_coords_changed(me);
   }
@@ -3362,7 +3410,7 @@ static void do_brush_action(Sculpt *sd,
   if (brush->deform_target == BRUSH_DEFORM_TARGET_CLOTH_SIM) {
     if (!ss->cache->cloth_sim) {
       ss->cache->cloth_sim = SCULPT_cloth_brush_simulation_create(
-          ss, 1.0f, 0.0f, 0.0f, false, true);
+          ob, 1.0f, 0.0f, 0.0f, false, true);
       SCULPT_cloth_brush_simulation_init(ss, ss->cache->cloth_sim);
     }
     SCULPT_cloth_brush_store_simulation_state(ss, ss->cache->cloth_sim);
@@ -3541,8 +3589,9 @@ static void sculpt_flush_pbvhvert_deform(Object *ob, PBVHVertexIter *vd)
   copy_v3_v3(ss->deform_cos[index], vd->co);
   copy_v3_v3(ss->orig_cos[index], newco);
 
+  MVert *verts = BKE_mesh_verts_for_write(me);
   if (!ss->shapekey_active) {
-    copy_v3_v3(me->mvert[index].co, newco);
+    copy_v3_v3(verts[index].co, newco);
   }
 }
 
@@ -4744,7 +4793,7 @@ static void sculpt_raycast_cb(PBVHNode *node, void *data_v, float *tmin)
                             srd->ray_normal,
                             &srd->isect_precalc,
                             &srd->depth,
-                            &srd->active_vertex_index,
+                            &srd->active_vertex,
                             &srd->active_face_grid_index,
                             srd->face_normal)) {
     srd->hit = true;
@@ -4878,7 +4927,7 @@ bool SCULPT_cursor_geometry_info_update(bContext *C,
   }
 
   /* Update the active vertex of the SculptSession. */
-  ss->active_vertex_index = srd.active_vertex_index;
+  ss->active_vertex = srd.active_vertex;
   SCULPT_vertex_random_access_ensure(ss);
   copy_v3_v3(out->active_vertex_co, SCULPT_active_vertex_co_get(ss));
 
@@ -4952,7 +5001,10 @@ bool SCULPT_cursor_geometry_info_update(bContext *C,
   return true;
 }
 
-bool SCULPT_stroke_get_location(bContext *C, float out[3], const float mval[2])
+bool SCULPT_stroke_get_location(bContext *C,
+                                float out[3],
+                                const float mval[2],
+                                bool force_original)
 {
   Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
   Object *ob;
@@ -4968,7 +5020,7 @@ bool SCULPT_stroke_get_location(bContext *C, float out[3], const float mval[2])
 
   ss = ob->sculpt;
   cache = ss->cache;
-  original = (cache) ? cache->original : false;
+  original = force_original || ((cache) ? cache->original : false);
 
   const Brush *brush = BKE_paint_brush(BKE_paint_get_active_from_context(C));
 
@@ -5263,6 +5315,8 @@ void SCULPT_flush_update_done(const bContext *C, Object *ob, SculptUpdateType up
     BKE_pbvh_update_vertex_data(ss->pbvh, PBVH_UpdateColor);
   }
 
+  BKE_sculpt_attributes_destroy_temporary_stroke(ob);
+
   if (BKE_pbvh_type(ss->pbvh) == PBVH_BMESH) {
     BKE_pbvh_bmesh_after_stroke(ss->pbvh);
   }
@@ -5284,7 +5338,7 @@ void SCULPT_flush_update_done(const bContext *C, Object *ob, SculptUpdateType up
 static bool over_mesh(bContext *C, struct wmOperator *UNUSED(op), const float mval[2])
 {
   float co_dummy[3];
-  return SCULPT_stroke_get_location(C, co_dummy, mval);
+  return SCULPT_stroke_get_location(C, co_dummy, mval, false);
 }
 
 bool SCULPT_handles_colors_report(SculptSession *ss, ReportList *reports)
@@ -5342,7 +5396,7 @@ static bool sculpt_stroke_test_start(bContext *C, struct wmOperator *op, const f
       ED_image_undo_push_begin(op->type->name, PAINT_MODE_SCULPT);
     }
     else {
-      SCULPT_undo_push_begin(ob, sculpt_tool_name(sd));
+      SCULPT_undo_push_begin_ex(ob, sculpt_tool_name(sd));
     }
 
     return true;
@@ -5352,7 +5406,7 @@ static bool sculpt_stroke_test_start(bContext *C, struct wmOperator *op, const f
 
 static void sculpt_stroke_update_step(bContext *C,
                                       wmOperator *UNUSED(op),
-                                      struct PaintStroke *UNUSED(stroke),
+                                      struct PaintStroke *stroke,
                                       PointerRNA *itemptr)
 {
   UnifiedPaintSettings *ups = &CTX_data_tool_settings(C)->unified_paint_settings;
@@ -5361,6 +5415,8 @@ static void sculpt_stroke_update_step(bContext *C,
   SculptSession *ss = ob->sculpt;
   const Brush *brush = BKE_paint_brush(&sd->paint);
   ToolSettings *tool_settings = CTX_data_tool_settings(C);
+  StrokeCache *cache = ss->cache;
+  cache->stroke_distance = paint_stroke_distance_get(stroke);
 
   SCULPT_stroke_modifiers_check(C, ob, brush);
   sculpt_update_cache_variants(C, sd, ob, itemptr);
@@ -5499,17 +5555,39 @@ static int sculpt_brush_stroke_invoke(bContext *C, wmOperator *op, const wmEvent
   struct PaintStroke *stroke;
   int ignore_background_click;
   int retval;
+  Object *ob = CTX_data_active_object(C);
+
+  /* Test that ob is visible; otherwise we won't be able to get evaluated data
+   * from the depsgraph. We do this here instead of SCULPT_mode_poll
+   * to avoid falling through to the translate operator in the
+   * global view3d keymap.
+   *
+   * NOTE: #BKE_object_is_visible_in_viewport is not working here (it returns false
+   * if the object is in local view); instead, test for OB_HIDE_VIEWPORT directly.
+   */
+
+  if (ob->visibility_flag & OB_HIDE_VIEWPORT) {
+    return OPERATOR_CANCELLED;
+  }
 
   sculpt_brush_stroke_init(C, op);
 
-  Object *ob = CTX_data_active_object(C);
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   Brush *brush = BKE_paint_brush(&sd->paint);
+  SculptSession *ss = ob->sculpt;
 
   if (SCULPT_tool_is_paint(brush->sculpt_tool) &&
       !SCULPT_handles_colors_report(ob->sculpt, op->reports)) {
     return OPERATOR_CANCELLED;
   }
+  if (SCULPT_tool_is_mask(brush->sculpt_tool)) {
+    MultiresModifierData *mmd = BKE_sculpt_multires_active(ss->scene, ob);
+    BKE_sculpt_mask_layers_ensure(ob, mmd);
+  }
+  if (SCULPT_tool_is_face_sets(brush->sculpt_tool)) {
+    Mesh *mesh = BKE_object_get_original_mesh(ob);
+    ss->face_sets = BKE_sculpt_face_sets_ensure(mesh);
+  }
 
   stroke = paint_stroke_new(C,
                             op,
@@ -5590,6 +5668,10 @@ static int sculpt_brush_stroke_modal(bContext *C, wmOperator *op, const wmEvent
   return paint_stroke_modal(C, op, event, (struct PaintStroke **)&op->customdata);
 }
 
+static void sculpt_redo_empty_ui(bContext *UNUSED(C), wmOperator *UNUSED(op))
+{
+}
+
 void SCULPT_OT_brush_stroke(wmOperatorType *ot)
 {
   /* Identifiers. */
@@ -5603,9 +5685,10 @@ void SCULPT_OT_brush_stroke(wmOperatorType *ot)
   ot->exec = sculpt_brush_stroke_exec;
   ot->poll = SCULPT_poll;
   ot->cancel = sculpt_brush_stroke_cancel;
+  ot->ui = sculpt_redo_empty_ui;
 
   /* Flags (sculpt does own undo? (ton)). */
-  ot->flag = OPTYPE_BLOCKING;
+  ot->flag = OPTYPE_BLOCKING | OPTYPE_REGISTER | OPTYPE_UNDO;
 
   /* Properties. */
 
@@ -5645,10 +5728,10 @@ enum {
   SCULPT_TOPOLOGY_ID_DEFAULT,
 };
 
-static int SCULPT_vertex_get_connected_component(SculptSession *ss, int index)
+static int SCULPT_vertex_get_connected_component(SculptSession *ss, PBVHVertRef vertex)
 {
   if (ss->vertex_info.connected_component) {
-    return ss->vertex_info.connected_component[index];
+    return ss->vertex_info.connected_component[vertex.i];
   }
   return SCULPT_TOPOLOGY_ID_DEFAULT;
 }
@@ -5665,8 +5748,11 @@ static void SCULPT_fake_neighbor_init(SculptSession *ss, const float max_dist)
   ss->fake_neighbors.current_max_distance = max_dist;
 }
 
-static void SCULPT_fake_neighbor_add(SculptSession *ss, int v_index_a, int v_index_b)
+static void SCULPT_fake_neighbor_add(SculptSession *ss, PBVHVertRef v_a, PBVHVertRef v_b)
 {
+  int v_index_a = BKE_pbvh_vertex_to_index(ss->pbvh, v_a);
+  int v_index_b = BKE_pbvh_vertex_to_index(ss->pbvh, v_b);
+
   if (ss->fake_neighbors.fake_neighbor_index[v_index_a] == FAKE_NEIGHBOR_NONE) {
     ss->fake_neighbors.fake_neighbor_index[v_index_a] = v_index_b;
     ss->fake_neighbors.fake_neighbor_index[v_index_b] = v_index_a;
@@ -5679,7 +5765,7 @@ static void sculpt_pose_fake_neighbors_free(SculptSession *ss)
 }
 
 typedef struct NearestVertexFakeNeighborTLSData {
-  int nearest_vertex_index;
+  PBVHVertRef nearest_vertex;
   float nearest_vertex_distance_squared;
   int current_topology_id;
 } NearestVertexFakeNeighborTLSData;
@@ -5694,13 +5780,13 @@ static void do_fake_neighbor_search_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    int vd_topology_id = SCULPT_vertex_get_connected_component(ss, vd.index);
+    int vd_topology_id = SCULPT_vertex_get_connected_component(ss, vd.vertex);
     if (vd_topology_id != nvtd->current_topology_id &&
         ss->fake_neighbors.fake_neighbor_index[vd.index] == FAKE_NEIGHBOR_NONE) {
       float distance_squared = len_squared_v3v3(vd.co, data->nearest_vertex_search_co);
       if (distance_squared < nvtd->nearest_vertex_distance_squared &&
           distance_squared < data->max_distance_squared) {
-        nvtd->nearest_vertex_index = vd.index;
+        nvtd->nearest_vertex = vd.vertex;
         nvtd->nearest_vertex_distance_squared = distance_squared;
       }
     }
@@ -5714,17 +5800,20 @@ static void fake_neighbor_search_reduce(const void *__restrict UNUSED(userdata),
 {
   NearestVertexFakeNeighborTLSData *join = chunk_join;
   NearestVertexFakeNeighborTLSData *nvtd = chunk;
-  if (join->nearest_vertex_index == -1) {
-    join->nearest_vertex_index = nvtd->nearest_vertex_index;
+  if (join->nearest_vertex.i == PBVH_REF_NONE) {
+    join->nearest_vertex = nvtd->nearest_vertex;
     join->nearest_vertex_distance_squared = nvtd->nearest_vertex_distance_squared;
   }
   else if (nvtd->nearest_vertex_distance_squared < join->nearest_vertex_distance_squared) {
-    join->nearest_vertex_index = nvtd->nearest_vertex_index;
+    join->nearest_vertex = nvtd->nearest_vertex;
     join->nearest_vertex_distance_squared = nvtd->nearest_vertex_distance_squared;
   }
 }
 
-static int SCULPT_fake_neighbor_search(Sculpt *sd, Object *ob, const int index, float max_distance)
+static PBVHVertRef SCULPT_fake_neighbor_search(Sculpt *sd,
+                                               Object *ob,
+                                               const PBVHVertRef vertex,
+                                               float max_distance)
 {
   SculptSession *ss = ob->sculpt;
   PBVHNode **nodes = NULL;
@@ -5734,12 +5823,12 @@ static int SCULPT_fake_neighbor_search(Sculpt *sd, Object *ob, const int index,
       .sd = sd,
       .radius_squared = max_distance * max_distance,
       .original = false,
-      .center = SCULPT_vertex_co_get(ss, index),
+      .center = SCULPT_vertex_co_get(ss, vertex),
   };
   BKE_pbvh_search_gather(ss->pbvh, SCULPT_search_sphere_cb, &data, &nodes, &totnode);
 
   if (totnode == 0) {
-    return -1;
+    return BKE_pbvh_make_vref(PBVH_REF_NONE);
   }
 
   SculptThreadedTaskData task_data = {
@@ -5749,12 +5838,12 @@ static int SCULPT_fake_neighbor_search(Sculpt *sd, Object *ob, const int index,
       .max_distance_squared = max_distance * max_distance,
   };
 
-  copy_v3_v3(task_data.nearest_vertex_search_co, SCULPT_vertex_co_get(ss, index));
+  copy_v3_v3(task_data.nearest_vertex_search_co, SCULPT_vertex_co_get(ss, vertex));
 
   NearestVertexFakeNeighborTLSData nvtd;
-  nvtd.nearest_vertex_index = -1;
+  nvtd.nearest_vertex.i = -1;
   nvtd.nearest_vertex_distance_squared = FLT_MAX;
-  nvtd.current_topology_id = SCULPT_vertex_get_connected_component(ss, index);
+  nvtd.current_topology_id = SCULPT_vertex_get_connected_component(ss, vertex);
 
   TaskParallelSettings settings;
   BKE_pbvh_parallel_range_settings(&settings, true, totnode);
@@ -5765,19 +5854,26 @@ static int SCULPT_fake_neighbor_search(Sculpt *sd, Object *ob, const int index,
 
   MEM_SAFE_FREE(nodes);
 
-  return nvtd.nearest_vertex_index;
+  return nvtd.nearest_vertex;
 }
 
 typedef struct SculptTopologyIDFloodFillData {
   int next_id;
 } SculptTopologyIDFloodFillData;
 
-static bool SCULPT_connected_components_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool UNUSED(is_duplicate), void *userdata)
+static bool SCULPT_connected_components_floodfill_cb(SculptSession *ss,
+                                                     PBVHVertRef from_v,
+                                                     PBVHVertRef to_v,
+                                                     bool UNUSED(is_duplicate),
+                                                     void *userdata)
 {
   SculptTopologyIDFloodFillData *data = userdata;
-  ss->vertex_info.connected_component[from_v] = data->next_id;
-  ss->vertex_info.connected_component[to_v] = data->next_id;
+
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
+  ss->vertex_info.connected_component[from_v_i] = data->next_id;
+  ss->vertex_info.connected_component[to_v_i] = data->next_id;
   return true;
 }
 
@@ -5801,10 +5897,12 @@ void SCULPT_connected_components_ensure(Object *ob)
 
   int next_id = 0;
   for (int i = 0; i < totvert; i++) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     if (ss->vertex_info.connected_component[i] == SCULPT_TOPOLOGY_ID_NONE) {
       SculptFloodFill flood;
       SCULPT_floodfill_init(ss, &flood);
-      SCULPT_floodfill_add_initial(&flood, i);
+      SCULPT_floodfill_add_initial(&flood, vertex);
       SculptTopologyIDFloodFillData data;
       data.next_id = next_id;
       SCULPT_floodfill_execute(ss, &flood, SCULPT_connected_components_floodfill_cb, &data);
@@ -5822,21 +5920,25 @@ void SCULPT_boundary_info_ensure(Object *object)
   }
 
   Mesh *base_mesh = BKE_mesh_from_object(object);
+  const MEdge *edges = BKE_mesh_edges(base_mesh);
+  const MPoly *polys = BKE_mesh_polys(base_mesh);
+  const MLoop *loops = BKE_mesh_loops(base_mesh);
+
   ss->vertex_info.boundary = BLI_BITMAP_NEW(base_mesh->totvert, "Boundary info");
   int *adjacent_faces_edge_count = MEM_calloc_arrayN(
       base_mesh->totedge, sizeof(int), "Adjacent face edge count");
 
   for (int p = 0; p < base_mesh->totpoly; p++) {
-    MPoly *poly = &base_mesh->mpoly[p];
+    const MPoly *poly = &polys[p];
     for (int l = 0; l < poly->totloop; l++) {
-      MLoop *loop = &base_mesh->mloop[l + poly->loopstart];
+      const MLoop *loop = &loops[l + poly->loopstart];
       adjacent_faces_edge_count[loop->e]++;
     }
   }
 
   for (int e = 0; e < base_mesh->totedge; e++) {
     if (adjacent_faces_edge_count[e] < 2) {
-      MEdge *edge = &base_mesh->medge[e];
+      const MEdge *edge = &edges[e];
       BLI_BITMAP_SET(ss->vertex_info.boundary, edge->v1, true);
       BLI_BITMAP_SET(ss->vertex_info.boundary, edge->v2, true);
     }
@@ -5862,12 +5964,12 @@ void SCULPT_fake_neighbors_ensure(Sculpt *sd, Object *ob, const float max_dist)
   SCULPT_fake_neighbor_init(ss, max_dist);
 
   for (int i = 0; i < totvert; i++) {
-    const int from_v = i;
+    const PBVHVertRef from_v = BKE_pbvh_index_to_vertex(ss->pbvh, i);
 
     /* This vertex does not have a fake neighbor yet, search one for it. */
-    if (ss->fake_neighbors.fake_neighbor_index[from_v] == FAKE_NEIGHBOR_NONE) {
-      const int to_v = SCULPT_fake_neighbor_search(sd, ob, from_v, max_dist);
-      if (to_v != -1) {
+    if (ss->fake_neighbors.fake_neighbor_index[i] == FAKE_NEIGHBOR_NONE) {
+      const PBVHVertRef to_v = SCULPT_fake_neighbor_search(sd, ob, from_v, max_dist);
+      if (to_v.i != PBVH_REF_NONE) {
         /* Add the fake neighbor if available. */
         SCULPT_fake_neighbor_add(ss, from_v, to_v);
       }
diff --git a/source/blender/editors/sculpt_paint/sculpt_automasking.cc b/source/blender/editors/sculpt_paint/sculpt_automasking.cc
index bb101717c9b..f4da70faad7 100644
--- a/source/blender/editors/sculpt_paint/sculpt_automasking.cc
+++ b/source/blender/editors/sculpt_paint/sculpt_automasking.cc
@@ -114,16 +114,19 @@ static bool SCULPT_automasking_needs_factors_cache(const Sculpt *sd, const Brush
   return false;
 }
 
-float SCULPT_automasking_factor_get(AutomaskingCache *automasking, SculptSession *ss, int vert)
+float SCULPT_automasking_factor_get(AutomaskingCache *automasking,
+                                    SculptSession *ss,
+                                    PBVHVertRef vert)
 {
   if (!automasking) {
     return 1.0f;
   }
+
   /* If the cache is initialized with valid info, use the cache. This is used when the
    * automasking information can't be computed in real time per vertex and needs to be
    * initialized for the whole mesh when the stroke starts. */
-  if (automasking->factor) {
-    return automasking->factor[vert];
+  if (ss->attrs.automasking_factor) {
+    return *(float *)SCULPT_vertex_attr_get(vert, ss->attrs.automasking_factor);
   }
 
   if (automasking->settings.flags & BRUSH_AUTOMASKING_FACE_SETS) {
@@ -153,7 +156,6 @@ void SCULPT_automasking_cache_free(AutomaskingCache *automasking)
     return;
   }
 
-  MEM_SAFE_FREE(automasking->factor);
   MEM_SAFE_FREE(automasking);
 }
 
@@ -171,38 +173,42 @@ static bool sculpt_automasking_is_constrained_by_radius(Brush *br)
 }
 
 struct AutomaskFloodFillData {
-  float *automask_factor;
   float radius;
   bool use_radius;
   float location[3];
   char symm;
 };
 
-static bool automask_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool UNUSED(is_duplicate), void *userdata)
+static bool automask_floodfill_cb(SculptSession *ss,
+                                  PBVHVertRef from_v,
+                                  PBVHVertRef to_v,
+                                  bool UNUSED(is_duplicate),
+                                  void *userdata)
 {
   AutomaskFloodFillData *data = (AutomaskFloodFillData *)userdata;
 
-  data->automask_factor[to_v] = 1.0f;
-  data->automask_factor[from_v] = 1.0f;
+  *(float *)SCULPT_vertex_attr_get(to_v, ss->attrs.automasking_factor) = 1.0f;
+  *(float *)SCULPT_vertex_attr_get(from_v, ss->attrs.automasking_factor) = 1.0f;
   return (!data->use_radius ||
           SCULPT_is_vertex_inside_brush_radius_symm(
               SCULPT_vertex_co_get(ss, to_v), data->location, data->radius, data->symm));
 }
 
-static float *SCULPT_topology_automasking_init(Sculpt *sd, Object *ob, float *automask_factor)
+static void SCULPT_topology_automasking_init(Sculpt *sd, Object *ob)
 {
   SculptSession *ss = ob->sculpt;
   Brush *brush = BKE_paint_brush(&sd->paint);
 
   if (BKE_pbvh_type(ss->pbvh) == PBVH_FACES && !ss->pmap) {
     BLI_assert_msg(0, "Topology masking: pmap missing");
-    return nullptr;
+    return;
   }
 
   const int totvert = SCULPT_vertex_count_get(ss);
   for (int i : IndexRange(totvert)) {
-    automask_factor[i] = 0.0f;
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    (*(float *)SCULPT_vertex_attr_get(vertex, ss->attrs.automasking_factor)) = 0.0f;
   }
 
   /* Flood fill automask to connected vertices. Limited to vertices inside
@@ -212,9 +218,8 @@ static float *SCULPT_topology_automasking_init(Sculpt *sd, Object *ob, float *au
   const float radius = ss->cache ? ss->cache->radius : FLT_MAX;
   SCULPT_floodfill_add_active(sd, ob, ss, &flood, radius);
 
-  AutomaskFloodFillData fdata = {nullptr};
+  AutomaskFloodFillData fdata = {0};
 
-  fdata.automask_factor = automask_factor;
   fdata.radius = radius;
   fdata.use_radius = ss->cache && sculpt_automasking_is_constrained_by_radius(brush);
   fdata.symm = SCULPT_mesh_symmetry_xyz_get(ob);
@@ -222,62 +227,61 @@ static float *SCULPT_topology_automasking_init(Sculpt *sd, Object *ob, float *au
   copy_v3_v3(fdata.location, SCULPT_active_vertex_co_get(ss));
   SCULPT_floodfill_execute(ss, &flood, automask_floodfill_cb, &fdata);
   SCULPT_floodfill_free(&flood);
-
-  return automask_factor;
 }
 
-static float *sculpt_face_sets_automasking_init(Sculpt *sd, Object *ob, float *automask_factor)
+static void sculpt_face_sets_automasking_init(Sculpt *sd, Object *ob)
 {
   SculptSession *ss = ob->sculpt;
   Brush *brush = BKE_paint_brush(&sd->paint);
 
   if (!SCULPT_is_automasking_enabled(sd, ss, brush)) {
-    return nullptr;
+    return;
   }
 
   if (BKE_pbvh_type(ss->pbvh) == PBVH_FACES && !ss->pmap) {
     BLI_assert_msg(0, "Face Sets automasking: pmap missing");
-    return nullptr;
+    return;
   }
 
   int tot_vert = SCULPT_vertex_count_get(ss);
   int active_face_set = SCULPT_active_face_set_get(ss);
   for (int i : IndexRange(tot_vert)) {
-    if (!SCULPT_vertex_has_face_set(ss, i, active_face_set)) {
-      automask_factor[i] *= 0.0f;
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    if (!SCULPT_vertex_has_face_set(ss, vertex, active_face_set)) {
+      *(float *)SCULPT_vertex_attr_get(vertex, ss->attrs.automasking_factor) = 0.0f;
     }
   }
-
-  return automask_factor;
 }
 
 #define EDGE_DISTANCE_INF -1
 
-float *SCULPT_boundary_automasking_init(Object *ob,
-                                        eBoundaryAutomaskMode mode,
-                                        int propagation_steps,
-                                        float *automask_factor)
+static void SCULPT_boundary_automasking_init(Object *ob,
+                                             eBoundaryAutomaskMode mode,
+                                             int propagation_steps)
 {
   SculptSession *ss = ob->sculpt;
 
   if (!ss->pmap) {
     BLI_assert_msg(0, "Boundary Edges masking: pmap missing");
-    return nullptr;
+    return;
   }
 
   const int totvert = SCULPT_vertex_count_get(ss);
   int *edge_distance = (int *)MEM_callocN(sizeof(int) * totvert, "automask_factor");
 
   for (int i : IndexRange(totvert)) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     edge_distance[i] = EDGE_DISTANCE_INF;
     switch (mode) {
       case AUTOMASK_INIT_BOUNDARY_EDGES:
-        if (SCULPT_vertex_is_boundary(ss, i)) {
+        if (SCULPT_vertex_is_boundary(ss, vertex)) {
           edge_distance[i] = 0;
         }
         break;
       case AUTOMASK_INIT_BOUNDARY_FACE_SETS:
-        if (!SCULPT_vertex_has_unique_face_set(ss, i)) {
+        if (!SCULPT_vertex_has_unique_face_set(ss, vertex)) {
           edge_distance[i] = 0;
         }
         break;
@@ -286,11 +290,13 @@ float *SCULPT_boundary_automasking_init(Object *ob,
 
   for (int propagation_it : IndexRange(propagation_steps)) {
     for (int i : IndexRange(totvert)) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
       if (edge_distance[i] != EDGE_DISTANCE_INF) {
         continue;
       }
       SculptVertexNeighborIter ni;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
         if (edge_distance[ni.index] == propagation_it) {
           edge_distance[i] = propagation_it + 1;
         }
@@ -300,16 +306,19 @@ float *SCULPT_boundary_automasking_init(Object *ob,
   }
 
   for (int i : IndexRange(totvert)) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     if (edge_distance[i] == EDGE_DISTANCE_INF) {
       continue;
     }
     const float p = 1.0f - ((float)edge_distance[i] / (float)propagation_steps);
     const float edge_boundary_automask = pow2f(p);
-    automask_factor[i] *= (1.0f - edge_boundary_automask);
+
+    *(float *)SCULPT_vertex_attr_get(
+        vertex, ss->attrs.automasking_factor) *= (1.0f - edge_boundary_automask);
   }
 
   MEM_SAFE_FREE(edge_distance);
-  return automask_factor;
 }
 
 static void SCULPT_automasking_cache_settings_update(AutomaskingCache *automasking,
@@ -339,9 +348,16 @@ AutomaskingCache *SCULPT_automasking_cache_init(Sculpt *sd, Brush *brush, Object
     return automasking;
   }
 
-  automasking->factor = (float *)MEM_malloc_arrayN(totvert, sizeof(float), "automask_factor");
+  SculptAttributeParams params = {0};
+  params.stroke_only = true;
+
+  ss->attrs.automasking_factor = BKE_sculpt_attribute_ensure(
+      ob, ATTR_DOMAIN_POINT, CD_PROP_FLOAT, SCULPT_ATTRIBUTE_NAME(automasking_factor), &params);
+
   for (int i : IndexRange(totvert)) {
-    automasking->factor[i] = 1.0f;
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    (*(float *)SCULPT_vertex_attr_get(vertex, ss->attrs.automasking_factor)) = 0.0f;
   }
 
   const int boundary_propagation_steps = brush ?
@@ -350,22 +366,21 @@ AutomaskingCache *SCULPT_automasking_cache_init(Sculpt *sd, Brush *brush, Object
 
   if (SCULPT_is_automasking_mode_enabled(sd, brush, BRUSH_AUTOMASKING_TOPOLOGY)) {
     SCULPT_vertex_random_access_ensure(ss);
-    SCULPT_topology_automasking_init(sd, ob, automasking->factor);
+    SCULPT_topology_automasking_init(sd, ob);
   }
   if (SCULPT_is_automasking_mode_enabled(sd, brush, BRUSH_AUTOMASKING_FACE_SETS)) {
     SCULPT_vertex_random_access_ensure(ss);
-    sculpt_face_sets_automasking_init(sd, ob, automasking->factor);
+    sculpt_face_sets_automasking_init(sd, ob);
   }
 
   if (SCULPT_is_automasking_mode_enabled(sd, brush, BRUSH_AUTOMASKING_BOUNDARY_EDGES)) {
     SCULPT_vertex_random_access_ensure(ss);
-    SCULPT_boundary_automasking_init(
-        ob, AUTOMASK_INIT_BOUNDARY_EDGES, boundary_propagation_steps, automasking->factor);
+    SCULPT_boundary_automasking_init(ob, AUTOMASK_INIT_BOUNDARY_EDGES, boundary_propagation_steps);
   }
   if (SCULPT_is_automasking_mode_enabled(sd, brush, BRUSH_AUTOMASKING_BOUNDARY_FACE_SETS)) {
     SCULPT_vertex_random_access_ensure(ss);
     SCULPT_boundary_automasking_init(
-        ob, AUTOMASK_INIT_BOUNDARY_FACE_SETS, boundary_propagation_steps, automasking->factor);
+        ob, AUTOMASK_INIT_BOUNDARY_FACE_SETS, boundary_propagation_steps);
   }
 
   return automasking;
diff --git a/source/blender/editors/sculpt_paint/sculpt_boundary.c b/source/blender/editors/sculpt_paint/sculpt_boundary.c
index 44e2dfae480..005892b88a0 100644
--- a/source/blender/editors/sculpt_paint/sculpt_boundary.c
+++ b/source/blender/editors/sculpt_paint/sculpt_boundary.c
@@ -46,32 +46,38 @@
 #define BOUNDARY_STEPS_NONE -1
 
 typedef struct BoundaryInitialVertexFloodFillData {
-  int initial_vertex;
+  PBVHVertRef initial_vertex;
+  int initial_vertex_i;
   int boundary_initial_vertex_steps;
-  int boundary_initial_vertex;
+  PBVHVertRef boundary_initial_vertex;
+  int boundary_initial_vertex_i;
   int *floodfill_steps;
   float radius_sq;
 } BoundaryInitialVertexFloodFillData;
 
 static bool boundary_initial_vertex_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
   BoundaryInitialVertexFloodFillData *data = userdata;
 
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   if (!SCULPT_vertex_visible_get(ss, to_v)) {
     return false;
   }
 
   if (!is_duplicate) {
-    data->floodfill_steps[to_v] = data->floodfill_steps[from_v] + 1;
+    data->floodfill_steps[to_v_i] = data->floodfill_steps[from_v_i] + 1;
   }
   else {
-    data->floodfill_steps[to_v] = data->floodfill_steps[from_v];
+    data->floodfill_steps[to_v_i] = data->floodfill_steps[from_v_i];
   }
 
   if (SCULPT_vertex_is_boundary(ss, to_v)) {
-    if (data->floodfill_steps[to_v] < data->boundary_initial_vertex_steps) {
-      data->boundary_initial_vertex_steps = data->floodfill_steps[to_v];
+    if (data->floodfill_steps[to_v_i] < data->boundary_initial_vertex_steps) {
+      data->boundary_initial_vertex_steps = data->floodfill_steps[to_v_i];
+      data->boundary_initial_vertex_i = to_v_i;
       data->boundary_initial_vertex = to_v;
     }
   }
@@ -83,9 +89,9 @@ static bool boundary_initial_vertex_floodfill_cb(
 
 /* From a vertex index anywhere in the mesh, returns the closest vertex in a mesh boundary inside
  * the given radius, if it exists. */
-static int sculpt_boundary_get_closest_boundary_vertex(SculptSession *ss,
-                                                       const int initial_vertex,
-                                                       const float radius)
+static PBVHVertRef sculpt_boundary_get_closest_boundary_vertex(SculptSession *ss,
+                                                               const PBVHVertRef initial_vertex,
+                                                               const float radius)
 {
 
   if (SCULPT_vertex_is_boundary(ss, initial_vertex)) {
@@ -98,7 +104,7 @@ static int sculpt_boundary_get_closest_boundary_vertex(SculptSession *ss,
 
   BoundaryInitialVertexFloodFillData fdata = {
       .initial_vertex = initial_vertex,
-      .boundary_initial_vertex = BOUNDARY_VERTEX_NONE,
+      .boundary_initial_vertex = {BOUNDARY_VERTEX_NONE},
       .boundary_initial_vertex_steps = INT_MAX,
       .radius_sq = radius * radius,
   };
@@ -119,34 +125,38 @@ static int sculpt_boundary_get_closest_boundary_vertex(SculptSession *ss,
 static int BOUNDARY_INDICES_BLOCK_SIZE = 300;
 
 static void sculpt_boundary_index_add(SculptBoundary *boundary,
+                                      const PBVHVertRef new_vertex,
                                       const int new_index,
                                       const float distance,
-                                      GSet *included_vertices)
+                                      GSet *included_verts)
 {
 
-  boundary->vertices[boundary->num_vertices] = new_index;
+  boundary->verts[boundary->verts_num] = new_vertex;
+
   if (boundary->distance) {
     boundary->distance[new_index] = distance;
   }
-  if (included_vertices) {
-    BLI_gset_add(included_vertices, POINTER_FROM_INT(new_index));
+  if (included_verts) {
+    BLI_gset_add(included_verts, POINTER_FROM_INT(new_index));
   }
-  boundary->num_vertices++;
-  if (boundary->num_vertices >= boundary->vertices_capacity) {
-    boundary->vertices_capacity += BOUNDARY_INDICES_BLOCK_SIZE;
-    boundary->vertices = MEM_reallocN_id(
-        boundary->vertices, boundary->vertices_capacity * sizeof(int), "boundary indices");
+  boundary->verts_num++;
+  if (boundary->verts_num >= boundary->verts_capacity) {
+    boundary->verts_capacity += BOUNDARY_INDICES_BLOCK_SIZE;
+    boundary->verts = MEM_reallocN_id(
+        boundary->verts, boundary->verts_capacity * sizeof(PBVHVertRef), "boundary indices");
   }
 };
 
-static void sculpt_boundary_preview_edge_add(SculptBoundary *boundary, const int v1, const int v2)
+static void sculpt_boundary_preview_edge_add(SculptBoundary *boundary,
+                                             const PBVHVertRef v1,
+                                             const PBVHVertRef v2)
 {
 
-  boundary->edges[boundary->num_edges].v1 = v1;
-  boundary->edges[boundary->num_edges].v2 = v2;
-  boundary->num_edges++;
+  boundary->edges[boundary->edges_num].v1 = v1;
+  boundary->edges[boundary->edges_num].v2 = v2;
+  boundary->edges_num++;
 
-  if (boundary->num_edges >= boundary->edges_capacity) {
+  if (boundary->edges_num >= boundary->edges_capacity) {
     boundary->edges_capacity += BOUNDARY_INDICES_BLOCK_SIZE;
     boundary->edges = MEM_reallocN_id(boundary->edges,
                                       boundary->edges_capacity * sizeof(SculptBoundaryPreviewEdge),
@@ -159,7 +169,7 @@ static void sculpt_boundary_preview_edge_add(SculptBoundary *boundary, const int
  * as well as to check if the initial vertex is valid.
  */
 static bool sculpt_boundary_is_vertex_in_editable_boundary(SculptSession *ss,
-                                                           const int initial_vertex)
+                                                           const PBVHVertRef initial_vertex)
 {
 
   if (!SCULPT_vertex_visible_get(ss, initial_vertex)) {
@@ -170,9 +180,9 @@ static bool sculpt_boundary_is_vertex_in_editable_boundary(SculptSession *ss,
   int boundary_vertex_count = 0;
   SculptVertexNeighborIter ni;
   SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, initial_vertex, ni) {
-    if (SCULPT_vertex_visible_get(ss, ni.index)) {
+    if (SCULPT_vertex_visible_get(ss, ni.vertex)) {
       neighbor_count++;
-      if (SCULPT_vertex_is_boundary(ss, ni.index)) {
+      if (SCULPT_vertex_is_boundary(ss, ni.vertex)) {
         boundary_vertex_count++;
       }
     }
@@ -199,16 +209,19 @@ static bool sculpt_boundary_is_vertex_in_editable_boundary(SculptSession *ss,
 
 typedef struct BoundaryFloodFillData {
   SculptBoundary *boundary;
-  GSet *included_vertices;
+  GSet *included_verts;
   EdgeSet *preview_edges;
 
-  int last_visited_vertex;
+  PBVHVertRef last_visited_vertex;
 
 } BoundaryFloodFillData;
 
 static bool boundary_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   BoundaryFloodFillData *data = userdata;
   SculptBoundary *boundary = data->boundary;
   if (!SCULPT_vertex_is_boundary(ss, to_v)) {
@@ -217,9 +230,10 @@ static bool boundary_floodfill_cb(
   const float edge_len = len_v3v3(SCULPT_vertex_co_get(ss, from_v),
                                   SCULPT_vertex_co_get(ss, to_v));
   const float distance_boundary_to_dst = boundary->distance ?
-                                             boundary->distance[from_v] + edge_len :
+                                             boundary->distance[from_v_i] + edge_len :
                                              0.0f;
-  sculpt_boundary_index_add(boundary, to_v, distance_boundary_to_dst, data->included_vertices);
+  sculpt_boundary_index_add(
+      boundary, to_v, to_v_i, distance_boundary_to_dst, data->included_verts);
   if (!is_duplicate) {
     sculpt_boundary_preview_edge_add(boundary, from_v, to_v);
   }
@@ -229,32 +243,38 @@ static bool boundary_floodfill_cb(
 static void sculpt_boundary_indices_init(SculptSession *ss,
                                          SculptBoundary *boundary,
                                          const bool init_boundary_distances,
-                                         const int initial_boundary_index)
+                                         const PBVHVertRef initial_boundary_vertex)
 {
 
   const int totvert = SCULPT_vertex_count_get(ss);
-  boundary->vertices = MEM_malloc_arrayN(
-      BOUNDARY_INDICES_BLOCK_SIZE, sizeof(int), "boundary indices");
+  boundary->verts = MEM_malloc_arrayN(
+      BOUNDARY_INDICES_BLOCK_SIZE, sizeof(PBVHVertRef), "boundary indices");
+
   if (init_boundary_distances) {
     boundary->distance = MEM_calloc_arrayN(totvert, sizeof(float), "boundary distances");
   }
   boundary->edges = MEM_malloc_arrayN(
       BOUNDARY_INDICES_BLOCK_SIZE, sizeof(SculptBoundaryPreviewEdge), "boundary edges");
 
-  GSet *included_vertices = BLI_gset_int_new_ex("included vertices", BOUNDARY_INDICES_BLOCK_SIZE);
+  GSet *included_verts = BLI_gset_int_new_ex("included verts", BOUNDARY_INDICES_BLOCK_SIZE);
   SculptFloodFill flood;
   SCULPT_floodfill_init(ss, &flood);
 
-  boundary->initial_vertex = initial_boundary_index;
+  int initial_boundary_index = BKE_pbvh_vertex_to_index(ss->pbvh, initial_boundary_vertex);
+
+  boundary->initial_vertex = initial_boundary_vertex;
+  boundary->initial_vertex_i = initial_boundary_index;
+
   copy_v3_v3(boundary->initial_vertex_position,
              SCULPT_vertex_co_get(ss, boundary->initial_vertex));
-  sculpt_boundary_index_add(boundary, initial_boundary_index, 0.0f, included_vertices);
-  SCULPT_floodfill_add_initial(&flood, initial_boundary_index);
+  sculpt_boundary_index_add(
+      boundary, initial_boundary_vertex, initial_boundary_index, 0.0f, included_verts);
+  SCULPT_floodfill_add_initial(&flood, boundary->initial_vertex);
 
   BoundaryFloodFillData fdata = {
       .boundary = boundary,
-      .included_vertices = included_vertices,
-      .last_visited_vertex = BOUNDARY_VERTEX_NONE,
+      .included_verts = included_verts,
+      .last_visited_vertex = {BOUNDARY_VERTEX_NONE},
 
   };
 
@@ -262,20 +282,20 @@ static void sculpt_boundary_indices_init(SculptSession *ss,
   SCULPT_floodfill_free(&flood);
 
   /* Check if the boundary loops into itself and add the extra preview edge to close the loop. */
-  if (fdata.last_visited_vertex != BOUNDARY_VERTEX_NONE &&
+  if (fdata.last_visited_vertex.i != BOUNDARY_VERTEX_NONE &&
       sculpt_boundary_is_vertex_in_editable_boundary(ss, fdata.last_visited_vertex)) {
     SculptVertexNeighborIter ni;
     SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, fdata.last_visited_vertex, ni) {
-      if (BLI_gset_haskey(included_vertices, POINTER_FROM_INT(ni.index)) &&
-          sculpt_boundary_is_vertex_in_editable_boundary(ss, ni.index)) {
-        sculpt_boundary_preview_edge_add(boundary, fdata.last_visited_vertex, ni.index);
+      if (BLI_gset_haskey(included_verts, POINTER_FROM_INT(ni.index)) &&
+          sculpt_boundary_is_vertex_in_editable_boundary(ss, ni.vertex)) {
+        sculpt_boundary_preview_edge_add(boundary, fdata.last_visited_vertex, ni.vertex);
         boundary->forms_loop = true;
       }
     }
     SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
   }
 
-  BLI_gset_free(included_vertices, NULL);
+  BLI_gset_free(included_verts, NULL);
 }
 
 /**
@@ -286,7 +306,7 @@ static void sculpt_boundary_indices_init(SculptSession *ss,
  */
 static void sculpt_boundary_edit_data_init(SculptSession *ss,
                                            SculptBoundary *boundary,
-                                           const int initial_vertex,
+                                           const PBVHVertRef initial_vertex,
                                            const float radius)
 {
   const int totvert = SCULPT_vertex_count_get(ss);
@@ -297,72 +317,78 @@ static void sculpt_boundary_edit_data_init(SculptSession *ss,
       totvert, sizeof(SculptBoundaryEditInfo), "Boundary edit info");
 
   for (int i = 0; i < totvert; i++) {
-    boundary->edit_info[i].original_vertex = BOUNDARY_VERTEX_NONE;
-    boundary->edit_info[i].num_propagation_steps = BOUNDARY_STEPS_NONE;
+    boundary->edit_info[i].original_vertex_i = BOUNDARY_VERTEX_NONE;
+    boundary->edit_info[i].propagation_steps_num = BOUNDARY_STEPS_NONE;
   }
 
-  GSQueue *current_iteration = BLI_gsqueue_new(sizeof(int));
-  GSQueue *next_iteration = BLI_gsqueue_new(sizeof(int));
+  GSQueue *current_iteration = BLI_gsqueue_new(sizeof(PBVHVertRef));
+  GSQueue *next_iteration = BLI_gsqueue_new(sizeof(PBVHVertRef));
 
   /* Initialized the first iteration with the vertices already in the boundary. This is propagation
    * step 0. */
-  BLI_bitmap *visited_vertices = BLI_BITMAP_NEW(SCULPT_vertex_count_get(ss), "visited_vertices");
-  for (int i = 0; i < boundary->num_vertices; i++) {
-    boundary->edit_info[boundary->vertices[i]].original_vertex = boundary->vertices[i];
-    boundary->edit_info[boundary->vertices[i]].num_propagation_steps = 0;
+  BLI_bitmap *visited_verts = BLI_BITMAP_NEW(SCULPT_vertex_count_get(ss), "visited_verts");
+  for (int i = 0; i < boundary->verts_num; i++) {
+    int index = BKE_pbvh_vertex_to_index(ss->pbvh, boundary->verts[i]);
+
+    boundary->edit_info[index].original_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh,
+                                                                            boundary->verts[i]);
+    boundary->edit_info[index].propagation_steps_num = 0;
 
     /* This ensures that all duplicate vertices in the boundary have the same original_vertex
      * index, so the deformation for them will be the same. */
     if (has_duplicates) {
       SculptVertexNeighborIter ni_duplis;
-      SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, boundary->vertices[i], ni_duplis) {
+      SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, boundary->verts[i], ni_duplis) {
         if (ni_duplis.is_duplicate) {
-          boundary->edit_info[ni_duplis.index].original_vertex = boundary->vertices[i];
+          boundary->edit_info[ni_duplis.index].original_vertex_i = BKE_pbvh_vertex_to_index(
+              ss->pbvh, boundary->verts[i]);
         }
       }
       SCULPT_VERTEX_NEIGHBORS_ITER_END(ni_duplis);
     }
 
-    BLI_gsqueue_push(current_iteration, &boundary->vertices[i]);
+    BLI_gsqueue_push(current_iteration, &boundary->verts[i]);
   }
 
-  int num_propagation_steps = 0;
+  int propagation_steps_num = 0;
   float accum_distance = 0.0f;
 
   while (true) {
     /* Stop adding steps to edit info. This happens when a steps is further away from the boundary
      * than the brush radius or when the entire mesh was already processed. */
     if (accum_distance > radius || BLI_gsqueue_is_empty(current_iteration)) {
-      boundary->max_propagation_steps = num_propagation_steps;
+      boundary->max_propagation_steps = propagation_steps_num;
       break;
     }
 
     while (!BLI_gsqueue_is_empty(current_iteration)) {
-      int from_v;
+      PBVHVertRef from_v;
       BLI_gsqueue_pop(current_iteration, &from_v);
 
+      int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+
       SculptVertexNeighborIter ni;
       SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, from_v, ni) {
-        const bool is_visible = SCULPT_vertex_visible_get(ss, ni.index);
+        const bool is_visible = SCULPT_vertex_visible_get(ss, ni.vertex);
         if (!is_visible ||
-            boundary->edit_info[ni.index].num_propagation_steps != BOUNDARY_STEPS_NONE) {
+            boundary->edit_info[ni.index].propagation_steps_num != BOUNDARY_STEPS_NONE) {
           continue;
         }
-        boundary->edit_info[ni.index].original_vertex =
-            boundary->edit_info[from_v].original_vertex;
+        boundary->edit_info[ni.index].original_vertex_i =
+            boundary->edit_info[from_v_i].original_vertex_i;
 
-        BLI_BITMAP_ENABLE(visited_vertices, ni.index);
+        BLI_BITMAP_ENABLE(visited_verts, ni.index);
 
         if (ni.is_duplicate) {
           /* Grids duplicates handling. */
-          boundary->edit_info[ni.index].num_propagation_steps =
-              boundary->edit_info[from_v].num_propagation_steps;
+          boundary->edit_info[ni.index].propagation_steps_num =
+              boundary->edit_info[from_v_i].propagation_steps_num;
         }
         else {
-          boundary->edit_info[ni.index].num_propagation_steps =
-              boundary->edit_info[from_v].num_propagation_steps + 1;
+          boundary->edit_info[ni.index].propagation_steps_num =
+              boundary->edit_info[from_v_i].propagation_steps_num + 1;
 
-          BLI_gsqueue_push(next_iteration, &ni.index);
+          BLI_gsqueue_push(next_iteration, &ni.vertex);
 
           /* When copying the data to the neighbor for the next iteration, it has to be copied to
            * all its duplicates too. This is because it is not possible to know if the updated
@@ -370,12 +396,12 @@ static void sculpt_boundary_edit_data_init(SculptSession *ss,
            * copy the data in the from_v neighbor iterator. */
           if (has_duplicates) {
             SculptVertexNeighborIter ni_duplis;
-            SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, ni.index, ni_duplis) {
+            SCULPT_VERTEX_DUPLICATES_AND_NEIGHBORS_ITER_BEGIN (ss, ni.vertex, ni_duplis) {
               if (ni_duplis.is_duplicate) {
-                boundary->edit_info[ni_duplis.index].original_vertex =
-                    boundary->edit_info[from_v].original_vertex;
-                boundary->edit_info[ni_duplis.index].num_propagation_steps =
-                    boundary->edit_info[from_v].num_propagation_steps + 1;
+                boundary->edit_info[ni_duplis.index].original_vertex_i =
+                    boundary->edit_info[from_v_i].original_vertex_i;
+                boundary->edit_info[ni_duplis.index].propagation_steps_num =
+                    boundary->edit_info[from_v_i].propagation_steps_num + 1;
               }
             }
             SCULPT_VERTEX_NEIGHBORS_ITER_END(ni_duplis);
@@ -383,11 +409,12 @@ static void sculpt_boundary_edit_data_init(SculptSession *ss,
 
           /* Check the distance using the vertex that was propagated from the initial vertex that
            * was used to initialize the boundary. */
-          if (boundary->edit_info[from_v].original_vertex == initial_vertex) {
-            boundary->pivot_vertex = ni.index;
-            copy_v3_v3(boundary->initial_pivot_position, SCULPT_vertex_co_get(ss, ni.index));
+          if (boundary->edit_info[from_v_i].original_vertex_i ==
+              BKE_pbvh_vertex_to_index(ss->pbvh, initial_vertex)) {
+            boundary->pivot_vertex = ni.vertex;
+            copy_v3_v3(boundary->initial_pivot_position, SCULPT_vertex_co_get(ss, ni.vertex));
             accum_distance += len_v3v3(SCULPT_vertex_co_get(ss, from_v),
-                                       SCULPT_vertex_co_get(ss, ni.index));
+                                       SCULPT_vertex_co_get(ss, ni.vertex));
           }
         }
       }
@@ -396,15 +423,15 @@ static void sculpt_boundary_edit_data_init(SculptSession *ss,
 
     /* Copy the new vertices to the queue to be processed in the next iteration. */
     while (!BLI_gsqueue_is_empty(next_iteration)) {
-      int next_v;
+      PBVHVertRef next_v;
       BLI_gsqueue_pop(next_iteration, &next_v);
       BLI_gsqueue_push(current_iteration, &next_v);
     }
 
-    num_propagation_steps++;
+    propagation_steps_num++;
   }
 
-  MEM_SAFE_FREE(visited_vertices);
+  MEM_SAFE_FREE(visited_verts);
 
   BLI_gsqueue_free(current_iteration);
   BLI_gsqueue_free(next_iteration);
@@ -422,12 +449,13 @@ static void sculpt_boundary_falloff_factor_init(SculptSession *ss,
   BKE_curvemapping_init(brush->curve);
 
   for (int i = 0; i < totvert; i++) {
-    if (boundary->edit_info[i].num_propagation_steps != -1) {
+    if (boundary->edit_info[i].propagation_steps_num != -1) {
       boundary->edit_info[i].strength_factor = BKE_brush_curve_strength(
-          brush, boundary->edit_info[i].num_propagation_steps, boundary->max_propagation_steps);
+          brush, boundary->edit_info[i].propagation_steps_num, boundary->max_propagation_steps);
     }
 
-    if (boundary->edit_info[i].original_vertex == boundary->initial_vertex) {
+    if (boundary->edit_info[i].original_vertex_i ==
+        BKE_pbvh_vertex_to_index(ss->pbvh, boundary->initial_vertex)) {
       /* All vertices that are propagated from the original vertex won't be affected by the
        * boundary falloff, so there is no need to calculate anything else. */
       continue;
@@ -439,7 +467,7 @@ static void sculpt_boundary_falloff_factor_init(SculptSession *ss,
       continue;
     }
 
-    const float boundary_distance = boundary->distance[boundary->edit_info[i].original_vertex];
+    const float boundary_distance = boundary->distance[boundary->edit_info[i].original_vertex_i];
     float falloff_distance = 0.0f;
     float direction = 1.0f;
 
@@ -473,22 +501,22 @@ static void sculpt_boundary_falloff_factor_init(SculptSession *ss,
 
 SculptBoundary *SCULPT_boundary_data_init(Object *object,
                                           Brush *brush,
-                                          const int initial_vertex,
+                                          const PBVHVertRef initial_vertex,
                                           const float radius)
 {
   SculptSession *ss = object->sculpt;
 
-  if (initial_vertex == BOUNDARY_VERTEX_NONE) {
+  if (initial_vertex.i == PBVH_REF_NONE) {
     return NULL;
   }
 
   SCULPT_vertex_random_access_ensure(ss);
   SCULPT_boundary_info_ensure(object);
 
-  const int boundary_initial_vertex = sculpt_boundary_get_closest_boundary_vertex(
+  const PBVHVertRef boundary_initial_vertex = sculpt_boundary_get_closest_boundary_vertex(
       ss, initial_vertex, radius);
 
-  if (boundary_initial_vertex == BOUNDARY_VERTEX_NONE) {
+  if (boundary_initial_vertex.i == BOUNDARY_VERTEX_NONE) {
     return NULL;
   }
 
@@ -514,7 +542,7 @@ SculptBoundary *SCULPT_boundary_data_init(Object *object,
 
 void SCULPT_boundary_data_free(SculptBoundary *boundary)
 {
-  MEM_SAFE_FREE(boundary->vertices);
+  MEM_SAFE_FREE(boundary->verts);
   MEM_SAFE_FREE(boundary->edges);
   MEM_SAFE_FREE(boundary->distance);
   MEM_SAFE_FREE(boundary->edit_info);
@@ -536,30 +564,35 @@ static void sculpt_boundary_bend_data_init(SculptSession *ss, SculptBoundary *bo
   boundary->bend.pivot_positions = MEM_calloc_arrayN(totvert, sizeof(float[3]), "pivot positions");
 
   for (int i = 0; i < totvert; i++) {
-    if (boundary->edit_info[i].num_propagation_steps != boundary->max_propagation_steps) {
+    if (boundary->edit_info[i].propagation_steps_num != boundary->max_propagation_steps) {
       continue;
     }
+
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     float dir[3];
     float normal[3];
-    SCULPT_vertex_normal_get(ss, i, normal);
-    sub_v3_v3v3(dir,
-                SCULPT_vertex_co_get(ss, boundary->edit_info[i].original_vertex),
-                SCULPT_vertex_co_get(ss, i));
+    SCULPT_vertex_normal_get(ss, vertex, normal);
+    sub_v3_v3v3(
+        dir,
+        SCULPT_vertex_co_get(
+            ss, BKE_pbvh_index_to_vertex(ss->pbvh, boundary->edit_info[i].original_vertex_i)),
+        SCULPT_vertex_co_get(ss, vertex));
     cross_v3_v3v3(
-        boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex], dir, normal);
-    normalize_v3(boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex]);
-    copy_v3_v3(boundary->bend.pivot_positions[boundary->edit_info[i].original_vertex],
-               SCULPT_vertex_co_get(ss, i));
+        boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex_i], dir, normal);
+    normalize_v3(boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex_i]);
+    copy_v3_v3(boundary->bend.pivot_positions[boundary->edit_info[i].original_vertex_i],
+               SCULPT_vertex_co_get(ss, vertex));
   }
 
   for (int i = 0; i < totvert; i++) {
-    if (boundary->edit_info[i].num_propagation_steps == BOUNDARY_STEPS_NONE) {
+    if (boundary->edit_info[i].propagation_steps_num == BOUNDARY_STEPS_NONE) {
       continue;
     }
     copy_v3_v3(boundary->bend.pivot_positions[i],
-               boundary->bend.pivot_positions[boundary->edit_info[i].original_vertex]);
+               boundary->bend.pivot_positions[boundary->edit_info[i].original_vertex_i]);
     copy_v3_v3(boundary->bend.pivot_rotation_axis[i],
-               boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex]);
+               boundary->bend.pivot_rotation_axis[boundary->edit_info[i].original_vertex_i]);
   }
 }
 
@@ -569,36 +602,37 @@ static void sculpt_boundary_slide_data_init(SculptSession *ss, SculptBoundary *b
   boundary->slide.directions = MEM_calloc_arrayN(totvert, sizeof(float[3]), "slide directions");
 
   for (int i = 0; i < totvert; i++) {
-    if (boundary->edit_info[i].num_propagation_steps != boundary->max_propagation_steps) {
+    if (boundary->edit_info[i].propagation_steps_num != boundary->max_propagation_steps) {
       continue;
     }
-    sub_v3_v3v3(boundary->slide.directions[boundary->edit_info[i].original_vertex],
-                SCULPT_vertex_co_get(ss, boundary->edit_info[i].original_vertex),
-                SCULPT_vertex_co_get(ss, i));
-    normalize_v3(boundary->slide.directions[boundary->edit_info[i].original_vertex]);
+    sub_v3_v3v3(
+        boundary->slide.directions[boundary->edit_info[i].original_vertex_i],
+        SCULPT_vertex_co_get(
+            ss, BKE_pbvh_index_to_vertex(ss->pbvh, boundary->edit_info[i].original_vertex_i)),
+        SCULPT_vertex_co_get(ss, BKE_pbvh_index_to_vertex(ss->pbvh, i)));
+    normalize_v3(boundary->slide.directions[boundary->edit_info[i].original_vertex_i]);
   }
 
   for (int i = 0; i < totvert; i++) {
-    if (boundary->edit_info[i].num_propagation_steps == BOUNDARY_STEPS_NONE) {
+    if (boundary->edit_info[i].propagation_steps_num == BOUNDARY_STEPS_NONE) {
       continue;
     }
     copy_v3_v3(boundary->slide.directions[i],
-               boundary->slide.directions[boundary->edit_info[i].original_vertex]);
+               boundary->slide.directions[boundary->edit_info[i].original_vertex_i]);
   }
 }
 
 static void sculpt_boundary_twist_data_init(SculptSession *ss, SculptBoundary *boundary)
 {
   zero_v3(boundary->twist.pivot_position);
-  float(*poly_verts)[3] = MEM_malloc_arrayN(
-      boundary->num_vertices, sizeof(float[3]), "poly verts");
-  for (int i = 0; i < boundary->num_vertices; i++) {
-    add_v3_v3(boundary->twist.pivot_position, SCULPT_vertex_co_get(ss, boundary->vertices[i]));
-    copy_v3_v3(poly_verts[i], SCULPT_vertex_co_get(ss, boundary->vertices[i]));
+  float(*poly_verts)[3] = MEM_malloc_arrayN(boundary->verts_num, sizeof(float[3]), "poly verts");
+  for (int i = 0; i < boundary->verts_num; i++) {
+    add_v3_v3(boundary->twist.pivot_position, SCULPT_vertex_co_get(ss, boundary->verts[i]));
+    copy_v3_v3(poly_verts[i], SCULPT_vertex_co_get(ss, boundary->verts[i]));
   }
-  mul_v3_fl(boundary->twist.pivot_position, 1.0f / boundary->num_vertices);
+  mul_v3_fl(boundary->twist.pivot_position, 1.0f / boundary->verts_num);
   if (boundary->forms_loop) {
-    normal_poly_v3(boundary->twist.rotation_axis, poly_verts, boundary->num_vertices);
+    normal_poly_v3(boundary->twist.rotation_axis, poly_verts, boundary->verts_num);
   }
   else {
     sub_v3_v3v3(boundary->twist.rotation_axis,
@@ -649,7 +683,7 @@ static void do_boundary_brush_bend_task_cb_ex(void *__restrict userdata,
   const float angle = angle_factor * M_PI;
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -660,7 +694,7 @@ static void do_boundary_brush_bend_task_cb_ex(void *__restrict userdata,
     }
 
     const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
     float t_orig_co[3];
     float *target_co = SCULPT_brush_deform_target_vertex_co_get(ss, brush->deform_target, &vd);
     sub_v3_v3v3(t_orig_co, orig_data.co, boundary->bend.pivot_positions[vd.index]);
@@ -671,7 +705,7 @@ static void do_boundary_brush_bend_task_cb_ex(void *__restrict userdata,
     add_v3_v3(target_co, boundary->bend.pivot_positions[vd.index]);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -697,7 +731,7 @@ static void do_boundary_brush_slide_task_cb_ex(void *__restrict userdata,
   const float disp = sculpt_boundary_displacement_from_grab_delta_get(ss, boundary);
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -708,7 +742,7 @@ static void do_boundary_brush_slide_task_cb_ex(void *__restrict userdata,
     }
 
     const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
     float *target_co = SCULPT_brush_deform_target_vertex_co_get(ss, brush->deform_target, &vd);
     madd_v3_v3v3fl(target_co,
                    orig_data.co,
@@ -717,7 +751,7 @@ static void do_boundary_brush_slide_task_cb_ex(void *__restrict userdata,
                        strength);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -743,7 +777,7 @@ static void do_boundary_brush_inflate_task_cb_ex(void *__restrict userdata,
   const float disp = sculpt_boundary_displacement_from_grab_delta_get(ss, boundary);
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -754,7 +788,7 @@ static void do_boundary_brush_inflate_task_cb_ex(void *__restrict userdata,
     }
 
     const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
     float *target_co = SCULPT_brush_deform_target_vertex_co_get(ss, brush->deform_target, &vd);
     madd_v3_v3v3fl(target_co,
                    orig_data.co,
@@ -763,7 +797,7 @@ static void do_boundary_brush_inflate_task_cb_ex(void *__restrict userdata,
                        strength);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -787,7 +821,7 @@ static void do_boundary_brush_grab_task_cb_ex(void *__restrict userdata,
   SCULPT_orig_vert_data_init(&orig_data, data->ob, data->nodes[n], SCULPT_UNDO_COORDS);
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -798,7 +832,7 @@ static void do_boundary_brush_grab_task_cb_ex(void *__restrict userdata,
     }
 
     const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
     float *target_co = SCULPT_brush_deform_target_vertex_co_get(ss, brush->deform_target, &vd);
     madd_v3_v3v3fl(target_co,
                    orig_data.co,
@@ -806,7 +840,7 @@ static void do_boundary_brush_grab_task_cb_ex(void *__restrict userdata,
                    boundary->edit_info[vd.index].strength_factor * mask * automask * strength);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -838,7 +872,7 @@ static void do_boundary_brush_twist_task_cb_ex(void *__restrict userdata,
   const float angle = angle_factor * M_PI;
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -849,7 +883,7 @@ static void do_boundary_brush_twist_task_cb_ex(void *__restrict userdata,
     }
 
     const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+    const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
     float t_orig_co[3];
     float *target_co = SCULPT_brush_deform_target_vertex_co_get(ss, brush->deform_target, &vd);
     sub_v3_v3v3(t_orig_co, orig_data.co, boundary->twist.pivot_position);
@@ -860,7 +894,7 @@ static void do_boundary_brush_twist_task_cb_ex(void *__restrict userdata,
     add_v3_v3(target_co, boundary->twist.pivot_position);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -884,7 +918,7 @@ static void do_boundary_brush_smooth_task_cb_ex(void *__restrict userdata,
   SCULPT_orig_vert_data_init(&orig_data, data->ob, data->nodes[n], SCULPT_UNDO_COORDS);
 
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    if (boundary->edit_info[vd.index].num_propagation_steps == -1) {
+    if (boundary->edit_info[vd.index].propagation_steps_num == -1) {
       continue;
     }
 
@@ -896,11 +930,11 @@ static void do_boundary_brush_smooth_task_cb_ex(void *__restrict userdata,
 
     float coord_accum[3] = {0.0f, 0.0f, 0.0f};
     int total_neighbors = 0;
-    const int current_propagation_steps = boundary->edit_info[vd.index].num_propagation_steps;
+    const int current_propagation_steps = boundary->edit_info[vd.index].propagation_steps_num;
     SculptVertexNeighborIter ni;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
-      if (current_propagation_steps == boundary->edit_info[ni.index].num_propagation_steps) {
-        add_v3_v3(coord_accum, SCULPT_vertex_co_get(ss, ni.index));
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
+      if (current_propagation_steps == boundary->edit_info[ni.index].propagation_steps_num) {
+        add_v3_v3(coord_accum, SCULPT_vertex_co_get(ss, ni.vertex));
         total_neighbors++;
       }
     }
@@ -919,7 +953,7 @@ static void do_boundary_brush_smooth_task_cb_ex(void *__restrict userdata,
         target_co, vd.co, disp, boundary->edit_info[vd.index].strength_factor * mask * strength);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -933,7 +967,8 @@ void SCULPT_do_boundary_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totn
   const int symm_area = ss->cache->mirror_symmetry_pass;
   if (SCULPT_stroke_is_first_brush_step_of_symmetry_pass(ss->cache)) {
 
-    int initial_vertex;
+    PBVHVertRef initial_vertex;
+
     if (ss->cache->mirror_symmetry_pass == 0) {
       initial_vertex = SCULPT_active_vertex_get(ss);
     }
@@ -1017,8 +1052,8 @@ void SCULPT_boundary_edges_preview_draw(const uint gpuattr,
   }
   immUniformColor3fvAlpha(outline_col, outline_alpha);
   GPU_line_width(2.0f);
-  immBegin(GPU_PRIM_LINES, ss->boundary_preview->num_edges * 2);
-  for (int i = 0; i < ss->boundary_preview->num_edges; i++) {
+  immBegin(GPU_PRIM_LINES, ss->boundary_preview->edges_num * 2);
+  for (int i = 0; i < ss->boundary_preview->edges_num; i++) {
     immVertex3fv(gpuattr, SCULPT_vertex_co_get(ss, ss->boundary_preview->edges[i].v1));
     immVertex3fv(gpuattr, SCULPT_vertex_co_get(ss, ss->boundary_preview->edges[i].v2));
   }
diff --git a/source/blender/editors/sculpt_paint/sculpt_brush_types.c b/source/blender/editors/sculpt_paint/sculpt_brush_types.c
index cba97f9b968..00ad77e48cf 100644
--- a/source/blender/editors/sculpt_paint/sculpt_brush_types.c
+++ b/source/blender/editors/sculpt_paint/sculpt_brush_types.c
@@ -314,13 +314,13 @@ static void do_draw_brush_task_cb_ex(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     mul_v3_v3fl(proxy[vd.i], offset, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -412,13 +412,13 @@ static void do_fill_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -510,13 +510,13 @@ static void do_scrape_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -628,13 +628,13 @@ static void do_clay_thumb_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -783,13 +783,13 @@ static void do_flatten_brush_task_cb_ex(void *__restrict userdata,
                                                                   vd.no,
                                                                   vd.fno,
                                                                   vd.mask ? *vd.mask : 0.0f,
-                                                                  vd.index,
+                                                                  vd.vertex,
                                                                   thread_id);
 
       mul_v3_v3fl(proxy[vd.i], val, fade);
 
       if (vd.mvert) {
-        BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+        BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
       }
     }
   }
@@ -940,13 +940,13 @@ static void do_clay_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1066,13 +1066,13 @@ static void do_clay_strips_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1219,7 +1219,7 @@ static void do_snake_hook_brush_task_cb_ex(void *__restrict userdata,
                                                       vd.no,
                                                       vd.fno,
                                                       vd.mask ? *vd.mask : 0.0f,
-                                                      vd.index,
+                                                      vd.vertex,
                                                       thread_id);
     }
 
@@ -1267,12 +1267,12 @@ static void do_snake_hook_brush_task_cb_ex(void *__restrict userdata,
       if (vd.mask) {
         mul_v3_fl(disp, 1.0f - *vd.mask);
       }
-      mul_v3_fl(disp, SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index));
+      mul_v3_fl(disp, SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex));
       copy_v3_v3(proxy[vd.i], disp);
     }
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1352,13 +1352,13 @@ static void do_thumb_brush_task_cb_ex(void *__restrict userdata,
                                                                 orig_data.no,
                                                                 NULL,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], cono, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1426,7 +1426,7 @@ static void do_rotate_brush_task_cb_ex(void *__restrict userdata,
                                                                 orig_data.no,
                                                                 NULL,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     sub_v3_v3v3(vec, orig_data.co, ss->cache->location);
@@ -1436,7 +1436,7 @@ static void do_rotate_brush_task_cb_ex(void *__restrict userdata,
     sub_v3_v3(proxy[vd.i], orig_data.co);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1472,7 +1472,8 @@ static void do_layer_brush_task_cb_ex(void *__restrict userdata,
   Sculpt *sd = data->sd;
   const Brush *brush = data->brush;
 
-  const bool use_persistent_base = ss->persistent_base && brush->flag & BRUSH_PERSISTENT;
+  const bool use_persistent_base = !ss->bm && ss->attrs.persistent_co &&
+                                   brush->flag & BRUSH_PERSISTENT;
 
   PBVHVertexIter vd;
   SculptOrigVertData orig_data;
@@ -1497,13 +1498,13 @@ static void do_layer_brush_task_cb_ex(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     const int vi = vd.index;
     float *disp_factor;
     if (use_persistent_base) {
-      disp_factor = &ss->persistent_base[vi].disp;
+      disp_factor = (float *)SCULPT_vertex_attr_get(vd.vertex, ss->attrs.persistent_disp);
     }
     else {
       disp_factor = &ss->cache->layer_displacement_factor[vi];
@@ -1533,9 +1534,10 @@ static void do_layer_brush_task_cb_ex(void *__restrict userdata,
     float normal[3];
 
     if (use_persistent_base) {
-      SCULPT_vertex_persistent_normal_get(ss, vi, normal);
+      SCULPT_vertex_persistent_normal_get(ss, vd.vertex, normal);
       mul_v3_fl(normal, brush->height);
-      madd_v3_v3v3fl(final_co, SCULPT_vertex_persistent_co_get(ss, vi), normal, *disp_factor);
+      madd_v3_v3v3fl(
+          final_co, SCULPT_vertex_persistent_co_get(ss, vd.vertex), normal, *disp_factor);
     }
     else {
       copy_v3_v3(normal, orig_data.no);
@@ -1551,7 +1553,7 @@ static void do_layer_brush_task_cb_ex(void *__restrict userdata,
     SCULPT_clip(sd, ss, vd.co, final_co);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1609,7 +1611,7 @@ static void do_inflate_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
     float val[3];
 
@@ -1624,7 +1626,7 @@ static void do_inflate_brush_task_cb_ex(void *__restrict userdata,
     mul_v3_v3v3(proxy[vd.i], val, ss->cache->scale);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1677,13 +1679,13 @@ static void do_nudge_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], cono, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1756,7 +1758,7 @@ static void do_crease_brush_task_cb_ex(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
     float val1[3];
     float val2[3];
@@ -1777,7 +1779,7 @@ static void do_crease_brush_task_cb_ex(void *__restrict userdata,
     add_v3_v3v3(proxy[vd.i], val1, val2);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1872,7 +1874,7 @@ static void do_pinch_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
     float disp_center[3];
     float x_disp[3];
@@ -1896,7 +1898,7 @@ static void do_pinch_brush_task_cb_ex(void *__restrict userdata,
     mul_v3_v3fl(proxy[vd.i], disp_center, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -1988,7 +1990,7 @@ static void do_grab_brush_task_cb_ex(void *__restrict userdata,
                                                           orig_data.no,
                                                           NULL,
                                                           vd.mask ? *vd.mask : 0.0f,
-                                                          vd.index,
+                                                          vd.vertex,
                                                           thread_id);
 
     if (grab_silhouette) {
@@ -2005,7 +2007,7 @@ static void do_grab_brush_task_cb_ex(void *__restrict userdata,
     mul_v3_v3fl(proxy[vd.i], grab_delta, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2108,12 +2110,12 @@ static void do_elastic_deform_brush_task_cb_ex(void *__restrict userdata,
       mul_v3_fl(final_disp, 1.0f - *vd.mask);
     }
 
-    mul_v3_fl(final_disp, SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index));
+    mul_v3_fl(final_disp, SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex));
 
     copy_v3_v3(proxy[vd.i], final_disp);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2185,13 +2187,13 @@ static void do_draw_sharp_brush_task_cb_ex(void *__restrict userdata,
                                                     orig_data.no,
                                                     NULL,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     mul_v3_v3fl(proxy[vd.i], offset, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2268,7 +2270,7 @@ static void do_topology_slide_task_cb_ex(void *__restrict userdata,
                                                     orig_data.no,
                                                     NULL,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
     float current_disp[3];
     float current_disp_norm[3];
@@ -2290,10 +2292,10 @@ static void do_topology_slide_task_cb_ex(void *__restrict userdata,
     mul_v3_v3fl(current_disp, current_disp_norm, ss->cache->bstrength);
 
     SculptVertexNeighborIter ni;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
       float vertex_disp[3];
       float vertex_disp_norm[3];
-      sub_v3_v3v3(vertex_disp, SCULPT_vertex_co_get(ss, ni.index), vd.co);
+      sub_v3_v3v3(vertex_disp, SCULPT_vertex_co_get(ss, ni.vertex), vd.co);
       normalize_v3_v3(vertex_disp_norm, vertex_disp);
       if (dot_v3v3(current_disp_norm, vertex_disp_norm) > 0.0f) {
         madd_v3_v3fl(final_disp, vertex_disp_norm, dot_v3v3(current_disp, vertex_disp));
@@ -2304,7 +2306,7 @@ static void do_topology_slide_task_cb_ex(void *__restrict userdata,
     mul_v3_v3fl(proxy[vd.i], final_disp, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2323,31 +2325,31 @@ void SCULPT_relax_vertex(SculptSession *ss,
   int neighbor_count = 0;
   zero_v3(smooth_pos);
   zero_v3(boundary_normal);
-  const bool is_boundary = SCULPT_vertex_is_boundary(ss, vd->index);
+  const bool is_boundary = SCULPT_vertex_is_boundary(ss, vd->vertex);
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd->index, ni) {
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd->vertex, ni) {
     neighbor_count++;
     if (!filter_boundary_face_sets ||
-        (filter_boundary_face_sets && !SCULPT_vertex_has_unique_face_set(ss, ni.index))) {
+        (filter_boundary_face_sets && !SCULPT_vertex_has_unique_face_set(ss, ni.vertex))) {
 
       /* When the vertex to relax is boundary, use only connected boundary vertices for the average
        * position. */
       if (is_boundary) {
-        if (!SCULPT_vertex_is_boundary(ss, ni.index)) {
+        if (!SCULPT_vertex_is_boundary(ss, ni.vertex)) {
           continue;
         }
-        add_v3_v3(smooth_pos, SCULPT_vertex_co_get(ss, ni.index));
+        add_v3_v3(smooth_pos, SCULPT_vertex_co_get(ss, ni.vertex));
         avg_count++;
 
         /* Calculate a normal for the constraint plane using the edges of the boundary. */
         float to_neighbor[3];
-        sub_v3_v3v3(to_neighbor, SCULPT_vertex_co_get(ss, ni.index), vd->co);
+        sub_v3_v3v3(to_neighbor, SCULPT_vertex_co_get(ss, ni.vertex), vd->co);
         normalize_v3(to_neighbor);
         add_v3_v3(boundary_normal, to_neighbor);
       }
       else {
-        add_v3_v3(smooth_pos, SCULPT_vertex_co_get(ss, ni.index));
+        add_v3_v3(smooth_pos, SCULPT_vertex_co_get(ss, ni.vertex));
         avg_count++;
       }
     }
@@ -2376,7 +2378,7 @@ void SCULPT_relax_vertex(SculptSession *ss,
     normalize_v3_v3(vno, boundary_normal);
   }
   else {
-    SCULPT_vertex_normal_get(ss, vd->index, vno);
+    SCULPT_vertex_normal_get(ss, vd->vertex, vno);
   }
 
   if (is_zero_v3(vno)) {
@@ -2425,12 +2427,12 @@ static void do_topology_relax_task_cb_ex(void *__restrict userdata,
                                                     orig_data.no,
                                                     NULL,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     SCULPT_relax_vertex(ss, &vd, fade * bstrength, false, vd.co);
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2501,17 +2503,17 @@ static void do_displacement_eraser_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float limit_co[3];
     float disp[3];
-    SCULPT_vertex_limit_surface_get(ss, vd.index, limit_co);
+    SCULPT_vertex_limit_surface_get(ss, vd.vertex, limit_co);
     sub_v3_v3v3(disp, limit_co, vd.co);
     mul_v3_v3fl(proxy[vd.i], disp, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2567,7 +2569,7 @@ static void do_displacement_smear_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float current_disp[3];
@@ -2594,11 +2596,11 @@ static void do_displacement_smear_brush_task_cb_ex(void *__restrict userdata,
     float weights_accum = 1.0f;
 
     SculptVertexNeighborIter ni;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
       float vertex_disp[3];
       float vertex_disp_norm[3];
       float neighbor_limit_co[3];
-      SCULPT_vertex_limit_surface_get(ss, ni.index, neighbor_limit_co);
+      SCULPT_vertex_limit_surface_get(ss, ni.vertex, neighbor_limit_co);
       sub_v3_v3v3(vertex_disp,
                   ss->cache->limit_surface_co[ni.index],
                   ss->cache->limit_surface_co[vd.index]);
@@ -2623,7 +2625,7 @@ static void do_displacement_smear_brush_task_cb_ex(void *__restrict userdata,
     interp_v3_v3v3(vd.co, vd.co, new_co, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2638,7 +2640,7 @@ static void do_displacement_smear_store_prev_disp_task_cb_ex(
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
     sub_v3_v3v3(ss->cache->prev_displacement[vd.index],
-                SCULPT_vertex_co_get(ss, vd.index),
+                SCULPT_vertex_co_get(ss, vd.vertex),
                 ss->cache->limit_surface_co[vd.index]);
   }
   BKE_pbvh_vertex_iter_end;
@@ -2657,9 +2659,11 @@ void SCULPT_do_displacement_smear_brush(Sculpt *sd, Object *ob, PBVHNode **nodes
         totvert, sizeof(float[3]), "prev displacement");
     ss->cache->limit_surface_co = MEM_malloc_arrayN(totvert, sizeof(float[3]), "limit surface co");
     for (int i = 0; i < totvert; i++) {
-      SCULPT_vertex_limit_surface_get(ss, i, ss->cache->limit_surface_co[i]);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      SCULPT_vertex_limit_surface_get(ss, vertex, ss->cache->limit_surface_co[i]);
       sub_v3_v3v3(ss->cache->prev_displacement[i],
-                  SCULPT_vertex_co_get(ss, i),
+                  SCULPT_vertex_co_get(ss, vertex),
                   ss->cache->limit_surface_co[i]);
     }
   }
@@ -2722,7 +2726,7 @@ static void do_topology_rake_bmesh_task_cb_ex(void *__restrict userdata,
     const float fade =
         bstrength *
         SCULPT_brush_strength_factor(
-            ss, brush, vd.co, sqrtf(test.dist), vd.no, vd.fno, *vd.mask, vd.index, thread_id) *
+            ss, brush, vd.co, sqrtf(test.dist), vd.no, vd.fno, *vd.mask, vd.vertex, thread_id) *
         ss->cache->pressure;
 
     float avg[3], val[3];
@@ -2736,7 +2740,7 @@ static void do_topology_rake_bmesh_task_cb_ex(void *__restrict userdata,
     SCULPT_clip(sd, ss, vd.co, val);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -2799,7 +2803,7 @@ static void do_mask_brush_draw_task_cb_ex(void *__restrict userdata,
     }
 
     const float fade = SCULPT_brush_strength_factor(
-        ss, brush, vd.co, sqrtf(test.dist), vd.no, vd.fno, 0.0f, vd.index, thread_id);
+        ss, brush, vd.co, sqrtf(test.dist), vd.no, vd.fno, 0.0f, vd.vertex, thread_id);
 
     if (bstrength > 0.0f) {
       (*vd.mask) += fade * bstrength * (1.0f - *vd.mask);
@@ -2808,12 +2812,8 @@ static void do_mask_brush_draw_task_cb_ex(void *__restrict userdata,
       (*vd.mask) += fade * bstrength * (*vd.mask);
     }
     *vd.mask = clamp_f(*vd.mask, 0.0f, 1.0f);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
-    BKE_pbvh_vertex_iter_end;
   }
+  BKE_pbvh_vertex_iter_end;
 }
 
 void SCULPT_do_mask_brush_draw(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode)
diff --git a/source/blender/editors/sculpt_paint/sculpt_cloth.c b/source/blender/editors/sculpt_paint/sculpt_cloth.c
index 9d231f2ccd2..691dfa21851 100644
--- a/source/blender/editors/sculpt_paint/sculpt_cloth.c
+++ b/source/blender/editors/sculpt_paint/sculpt_cloth.c
@@ -220,13 +220,16 @@ static void cloth_brush_add_length_constraint(SculptSession *ss,
 
   length_constraint->type = SCULPT_CLOTH_CONSTRAINT_STRUCTURAL;
 
+  PBVHVertRef vertex1 = BKE_pbvh_index_to_vertex(ss->pbvh, v1);
+  PBVHVertRef vertex2 = BKE_pbvh_index_to_vertex(ss->pbvh, v2);
+
   if (use_persistent) {
-    length_constraint->length = len_v3v3(SCULPT_vertex_persistent_co_get(ss, v1),
-                                         SCULPT_vertex_persistent_co_get(ss, v2));
+    length_constraint->length = len_v3v3(SCULPT_vertex_persistent_co_get(ss, vertex1),
+                                         SCULPT_vertex_persistent_co_get(ss, vertex2));
   }
   else {
-    length_constraint->length = len_v3v3(SCULPT_vertex_co_get(ss, v1),
-                                         SCULPT_vertex_co_get(ss, v2));
+    length_constraint->length = len_v3v3(SCULPT_vertex_co_get(ss, vertex1),
+                                         SCULPT_vertex_co_get(ss, vertex2));
   }
   length_constraint->strength = 1.0f;
 
@@ -370,7 +373,7 @@ static void do_cloth_brush_build_constraints_task_cb_ex(
       int tot_indices = 0;
       build_indices[tot_indices] = vd.index;
       tot_indices++;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
         build_indices[tot_indices] = ni.index;
         tot_indices++;
       }
@@ -540,7 +543,7 @@ static void do_cloth_brush_apply_forces_task_cb_ex(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     float brush_disp[3];
@@ -611,13 +614,17 @@ static void do_cloth_brush_apply_forces_task_cb_ex(void *__restrict userdata,
   BKE_pbvh_vertex_iter_end;
 }
 
-static ListBase *cloth_brush_collider_cache_create(Depsgraph *depsgraph)
+static ListBase *cloth_brush_collider_cache_create(Object *object, Depsgraph *depsgraph)
 {
   ListBase *cache = NULL;
   DEG_OBJECT_ITER_BEGIN (depsgraph,
                          ob,
                          DEG_ITER_OBJECT_FLAG_LINKED_DIRECTLY | DEG_ITER_OBJECT_FLAG_VISIBLE |
                              DEG_ITER_OBJECT_FLAG_DUPLI) {
+    if (STREQ(object->id.name, ob->id.name)) {
+      continue;
+    }
+
     CollisionModifierData *cmd = (CollisionModifierData *)BKE_modifiers_findby_type(
         ob, eModifierType_Collision);
     if (!cmd) {
@@ -780,7 +787,7 @@ static void do_cloth_brush_solve_simulation_task_cb_ex(
     mul_v3_fl(pos_diff, (1.0f - cloth_sim->damping) * sim_factor);
 
     const float mask_v = (1.0f - (vd.mask ? *vd.mask : 0.0f)) *
-                         SCULPT_automasking_factor_get(automasking, ss, vd.index);
+                         SCULPT_automasking_factor_get(automasking, ss, vd.vertex);
 
     madd_v3_v3fl(cloth_sim->pos[i], pos_diff, mask_v);
     madd_v3_v3fl(cloth_sim->pos[i], cloth_sim->acceleration[i], mask_v);
@@ -798,7 +805,7 @@ static void do_cloth_brush_solve_simulation_task_cb_ex(
     copy_v3_v3(vd.co, cloth_sim->pos[vd.index]);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -848,10 +855,13 @@ static void cloth_brush_satisfy_constraints(SculptSession *ss,
 
       mul_v3_v3fl(correction_vector_half, correction_vector, 0.5f);
 
-      const float mask_v1 = (1.0f - SCULPT_vertex_mask_get(ss, v1)) *
-                            SCULPT_automasking_factor_get(automasking, ss, v1);
-      const float mask_v2 = (1.0f - SCULPT_vertex_mask_get(ss, v2)) *
-                            SCULPT_automasking_factor_get(automasking, ss, v2);
+      PBVHVertRef vertex1 = BKE_pbvh_index_to_vertex(ss->pbvh, v1);
+      PBVHVertRef vertex2 = BKE_pbvh_index_to_vertex(ss->pbvh, v2);
+
+      const float mask_v1 = (1.0f - SCULPT_vertex_mask_get(ss, vertex1)) *
+                            SCULPT_automasking_factor_get(automasking, ss, vertex1);
+      const float mask_v2 = (1.0f - SCULPT_vertex_mask_get(ss, vertex2)) *
+                            SCULPT_automasking_factor_get(automasking, ss, vertex2);
 
       float sim_location[3];
       cloth_brush_simulation_location_get(ss, brush, sim_location);
@@ -1029,13 +1039,14 @@ static void cloth_sim_initialize_default_node_state(SculptSession *ss,
   MEM_SAFE_FREE(nodes);
 }
 
-SculptClothSimulation *SCULPT_cloth_brush_simulation_create(SculptSession *ss,
+SculptClothSimulation *SCULPT_cloth_brush_simulation_create(Object *ob,
                                                             const float cloth_mass,
                                                             const float cloth_damping,
                                                             const float cloth_softbody_strength,
                                                             const bool use_collisions,
                                                             const bool needs_deform_coords)
 {
+  SculptSession *ss = ob->sculpt;
   const int totverts = SCULPT_vertex_count_get(ss);
   SculptClothSimulation *cloth_sim;
 
@@ -1073,7 +1084,7 @@ SculptClothSimulation *SCULPT_cloth_brush_simulation_create(SculptSession *ss,
   cloth_sim->softbody_strength = cloth_softbody_strength;
 
   if (use_collisions) {
-    cloth_sim->collider_list = cloth_brush_collider_cache_create(ss->depsgraph);
+    cloth_sim->collider_list = cloth_brush_collider_cache_create(ob, ss->depsgraph);
   }
 
   cloth_sim_initialize_default_node_state(ss, cloth_sim);
@@ -1124,15 +1135,17 @@ void SCULPT_cloth_brush_simulation_init(SculptSession *ss, SculptClothSimulation
   const bool has_deformation_pos = cloth_sim->deformation_pos != NULL;
   const bool has_softbody_pos = cloth_sim->softbody_pos != NULL;
   for (int i = 0; i < totverts; i++) {
-    copy_v3_v3(cloth_sim->last_iteration_pos[i], SCULPT_vertex_co_get(ss, i));
-    copy_v3_v3(cloth_sim->init_pos[i], SCULPT_vertex_co_get(ss, i));
-    copy_v3_v3(cloth_sim->prev_pos[i], SCULPT_vertex_co_get(ss, i));
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    copy_v3_v3(cloth_sim->last_iteration_pos[i], SCULPT_vertex_co_get(ss, vertex));
+    copy_v3_v3(cloth_sim->init_pos[i], SCULPT_vertex_co_get(ss, vertex));
+    copy_v3_v3(cloth_sim->prev_pos[i], SCULPT_vertex_co_get(ss, vertex));
     if (has_deformation_pos) {
-      copy_v3_v3(cloth_sim->deformation_pos[i], SCULPT_vertex_co_get(ss, i));
+      copy_v3_v3(cloth_sim->deformation_pos[i], SCULPT_vertex_co_get(ss, vertex));
       cloth_sim->deformation_strength[i] = 1.0f;
     }
     if (has_softbody_pos) {
-      copy_v3_v3(cloth_sim->softbody_pos[i], SCULPT_vertex_co_get(ss, i));
+      copy_v3_v3(cloth_sim->softbody_pos[i], SCULPT_vertex_co_get(ss, vertex));
     }
   }
 }
@@ -1141,7 +1154,9 @@ void SCULPT_cloth_brush_store_simulation_state(SculptSession *ss, SculptClothSim
 {
   const int totverts = SCULPT_vertex_count_get(ss);
   for (int i = 0; i < totverts; i++) {
-    copy_v3_v3(cloth_sim->pos[i], SCULPT_vertex_co_get(ss, i));
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    copy_v3_v3(cloth_sim->pos[i], SCULPT_vertex_co_get(ss, vertex));
   }
 }
 
@@ -1184,7 +1199,7 @@ void SCULPT_do_cloth_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode
     /* The simulation structure only needs to be created on the first symmetry pass. */
     if (SCULPT_stroke_is_first_brush_step(ss->cache) || !ss->cache->cloth_sim) {
       ss->cache->cloth_sim = SCULPT_cloth_brush_simulation_create(
-          ss,
+          ob,
           brush->cloth_mass,
           brush->cloth_damping,
           brush->cloth_constraint_softbody_strength,
@@ -1422,13 +1437,13 @@ static void cloth_filter_apply_forces_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, node, vd, PBVH_ITER_UNIQUE) {
     float fade = vd.mask ? *vd.mask : 0.0f;
-    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.index);
+    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.vertex);
     fade = 1.0f - fade;
     float force[3] = {0.0f, 0.0f, 0.0f};
     float disp[3], temp[3], transform[3][3];
 
     if (ss->filter_cache->active_face_set != SCULPT_FACE_SET_NONE) {
-      if (!SCULPT_vertex_has_face_set(ss, vd.index, ss->filter_cache->active_face_set)) {
+      if (!SCULPT_vertex_has_face_set(ss, vd.vertex, ss->filter_cache->active_face_set)) {
         continue;
       }
     }
@@ -1447,7 +1462,7 @@ static void cloth_filter_apply_forces_task_cb(void *__restrict userdata,
         break;
       case CLOTH_FILTER_INFLATE: {
         float normal[3];
-        SCULPT_vertex_normal_get(ss, vd.index, normal);
+        SCULPT_vertex_normal_get(ss, vd.vertex, normal);
         mul_v3_v3fl(force, normal, fade * data->filter_strength);
       } break;
       case CLOTH_FILTER_EXPAND:
@@ -1512,7 +1527,9 @@ static int sculpt_cloth_filter_modal(bContext *C, wmOperator *op, const wmEvent
   const int totverts = SCULPT_vertex_count_get(ss);
 
   for (int i = 0; i < totverts; i++) {
-    copy_v3_v3(ss->filter_cache->cloth_sim->pos[i], SCULPT_vertex_co_get(ss, i));
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    copy_v3_v3(ss->filter_cache->cloth_sim->pos[i], SCULPT_vertex_co_get(ss, vertex));
   }
 
   SculptThreadedTaskData data = {
@@ -1562,7 +1579,7 @@ static int sculpt_cloth_filter_invoke(bContext *C, wmOperator *op, const wmEvent
   /* Needs mask data to be available as it is used when solving the constraints. */
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, true, false);
 
-  SCULPT_undo_push_begin(ob, "Cloth filter");
+  SCULPT_undo_push_begin(ob, op);
   SCULPT_filter_cache_init(C, ob, sd, SCULPT_UNDO_COORDS);
 
   ss->filter_cache->automasking = SCULPT_automasking_cache_init(sd, NULL, ob);
@@ -1571,7 +1588,7 @@ static int sculpt_cloth_filter_invoke(bContext *C, wmOperator *op, const wmEvent
   const float cloth_damping = RNA_float_get(op->ptr, "cloth_damping");
   const bool use_collisions = RNA_boolean_get(op->ptr, "use_collisions");
   ss->filter_cache->cloth_sim = SCULPT_cloth_brush_simulation_create(
-      ss,
+      ob,
       cloth_mass,
       cloth_damping,
       0.0f,
diff --git a/source/blender/editors/sculpt_paint/sculpt_detail.c b/source/blender/editors/sculpt_paint/sculpt_detail.c
index 00503087e39..8f87cd1b6ed 100644
--- a/source/blender/editors/sculpt_paint/sculpt_detail.c
+++ b/source/blender/editors/sculpt_paint/sculpt_detail.c
@@ -76,7 +76,7 @@ static bool sculpt_and_dynamic_topology_poll(bContext *C)
 /** \name Detail Flood Fill
  * \{ */
 
-static int sculpt_detail_flood_fill_exec(bContext *C, wmOperator *UNUSED(op))
+static int sculpt_detail_flood_fill_exec(bContext *C, wmOperator *op)
 {
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   Object *ob = CTX_data_active_object(C);
@@ -106,7 +106,7 @@ static int sculpt_detail_flood_fill_exec(bContext *C, wmOperator *UNUSED(op))
   float object_space_constant_detail = 1.0f / (sd->constant_detail * mat4_to_scale(ob->obmat));
   BKE_pbvh_bmesh_detail_size_set(ss->pbvh, object_space_constant_detail);
 
-  SCULPT_undo_push_begin(ob, "Dynamic topology flood fill");
+  SCULPT_undo_push_begin(ob, op);
   SCULPT_undo_push_node(ob, NULL, SCULPT_UNDO_COORDS);
 
   while (BKE_pbvh_bmesh_update_topology(
@@ -174,13 +174,13 @@ static void sample_detail_voxel(bContext *C, ViewContext *vc, const int mval[2])
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, false, false);
 
   /* Average the edge length of the connected edges to the active vertex. */
-  int active_vertex = SCULPT_active_vertex_get(ss);
+  PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
   const float *active_vertex_co = SCULPT_active_vertex_co_get(ss);
   float edge_length = 0.0f;
   int tot = 0;
   SculptVertexNeighborIter ni;
   SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, active_vertex, ni) {
-    edge_length += len_v3v3(active_vertex_co, SCULPT_vertex_co_get(ss, ni.index));
+    edge_length += len_v3v3(active_vertex_co, SCULPT_vertex_co_get(ss, ni.vertex));
     tot += 1;
   }
   SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
@@ -578,14 +578,14 @@ static void dyntopo_detail_size_sample_from_surface(Object *ob,
                                                     DyntopoDetailSizeEditCustomData *cd)
 {
   SculptSession *ss = ob->sculpt;
-  const int active_vertex = SCULPT_active_vertex_get(ss);
+  const PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
 
   float len_accum = 0;
   int num_neighbors = 0;
   SculptVertexNeighborIter ni;
   SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, active_vertex, ni) {
     len_accum += len_v3v3(SCULPT_vertex_co_get(ss, active_vertex),
-                          SCULPT_vertex_co_get(ss, ni.index));
+                          SCULPT_vertex_co_get(ss, ni.vertex));
     num_neighbors++;
   }
   SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
diff --git a/source/blender/editors/sculpt_paint/sculpt_dyntopo.c b/source/blender/editors/sculpt_paint/sculpt_dyntopo.c
index 4f884420401..d69633bd05c 100644
--- a/source/blender/editors/sculpt_paint/sculpt_dyntopo.c
+++ b/source/blender/editors/sculpt_paint/sculpt_dyntopo.c
@@ -88,41 +88,6 @@ void SCULPT_pbvh_clear(Object *ob)
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
 }
 
-void SCULPT_dyntopo_node_layers_add(SculptSession *ss)
-{
-  int cd_node_layer_index;
-
-  char layer_id[] = "_dyntopo_node_id";
-
-  cd_node_layer_index = CustomData_get_named_layer_index(&ss->bm->vdata, CD_PROP_INT32, layer_id);
-  if (cd_node_layer_index == -1) {
-    BM_data_layer_add_named(ss->bm, &ss->bm->vdata, CD_PROP_INT32, layer_id);
-    cd_node_layer_index = CustomData_get_named_layer_index(
-        &ss->bm->vdata, CD_PROP_INT32, layer_id);
-  }
-
-  ss->cd_vert_node_offset = CustomData_get_n_offset(
-      &ss->bm->vdata,
-      CD_PROP_INT32,
-      cd_node_layer_index - CustomData_get_layer_index(&ss->bm->vdata, CD_PROP_INT32));
-
-  ss->bm->vdata.layers[cd_node_layer_index].flag |= CD_FLAG_TEMPORARY;
-
-  cd_node_layer_index = CustomData_get_named_layer_index(&ss->bm->pdata, CD_PROP_INT32, layer_id);
-  if (cd_node_layer_index == -1) {
-    BM_data_layer_add_named(ss->bm, &ss->bm->pdata, CD_PROP_INT32, layer_id);
-    cd_node_layer_index = CustomData_get_named_layer_index(
-        &ss->bm->pdata, CD_PROP_INT32, layer_id);
-  }
-
-  ss->cd_face_node_offset = CustomData_get_n_offset(
-      &ss->bm->pdata,
-      CD_PROP_INT32,
-      cd_node_layer_index - CustomData_get_layer_index(&ss->bm->pdata, CD_PROP_INT32));
-
-  ss->bm->pdata.layers[cd_node_layer_index].flag |= CD_FLAG_TEMPORARY;
-}
-
 void SCULPT_dynamic_topology_enable_ex(Main *bmain, Depsgraph *depsgraph, Scene *scene, Object *ob)
 {
   SculptSession *ss = ob->sculpt;
@@ -152,8 +117,9 @@ void SCULPT_dynamic_topology_enable_ex(Main *bmain, Depsgraph *depsgraph, Scene
                          .active_shapekey = ob->shapenr,
                      }));
   SCULPT_dynamic_topology_triangulate(ss->bm);
+
   BM_data_layer_add(ss->bm, &ss->bm->vdata, CD_PAINT_MASK);
-  SCULPT_dyntopo_node_layers_add(ss);
+
   /* Make sure the data for existing faces are initialized. */
   if (me->totpoly != ss->bm->totface) {
     BM_mesh_normals_update(ss->bm);
@@ -181,6 +147,9 @@ static void SCULPT_dynamic_topology_disable_ex(
   SculptSession *ss = ob->sculpt;
   Mesh *me = ob->data;
 
+  BKE_sculpt_attribute_destroy(ob, ss->attrs.dyntopo_node_id_vertex);
+  BKE_sculpt_attribute_destroy(ob, ss->attrs.dyntopo_node_id_face);
+
   SCULPT_pbvh_clear(ob);
 
   if (unode) {
@@ -206,25 +175,18 @@ static void SCULPT_dynamic_topology_disable_ex(
         &geometry->ldata, &me->ldata, CD_MASK_MESH.lmask, CD_DUPLICATE, geometry->totloop);
     CustomData_copy(
         &geometry->pdata, &me->pdata, CD_MASK_MESH.pmask, CD_DUPLICATE, geometry->totpoly);
-
-    BKE_mesh_update_customdata_pointers(me, false);
   }
   else {
     BKE_sculptsession_bm_to_me(ob, true);
 
     /* Reset Face Sets as they are no longer valid. */
-    if (!CustomData_has_layer(&me->pdata, CD_SCULPT_FACE_SETS)) {
-      CustomData_add_layer(&me->pdata, CD_SCULPT_FACE_SETS, CD_CALLOC, NULL, me->totpoly);
-    }
-    ss->face_sets = CustomData_get_layer(&me->pdata, CD_SCULPT_FACE_SETS);
-    for (int i = 0; i < me->totpoly; i++) {
-      ss->face_sets[i] = 1;
-    }
+    CustomData_free_layers(&me->pdata, CD_SCULPT_FACE_SETS, me->totpoly);
     me->face_sets_color_default = 1;
 
     /* Sync the visibility to vertices manually as the pmap is still not initialized. */
-    for (int i = 0; i < me->totvert; i++) {
-      me->mvert[i].flag &= ~ME_HIDE;
+    bool *hide_vert = (bool *)CustomData_get_layer_named(&me->vdata, CD_PROP_BOOL, ".hide_vert");
+    if (hide_vert != NULL) {
+      memset(hide_vert, 0, sizeof(bool) * me->totvert);
     }
   }
 
@@ -269,7 +231,7 @@ void sculpt_dynamic_topology_disable_with_undo(Main *bmain,
     /* May be false in background mode. */
     const bool use_undo = G.background ? (ED_undo_stack_get() != NULL) : true;
     if (use_undo) {
-      SCULPT_undo_push_begin(ob, "Dynamic topology disable");
+      SCULPT_undo_push_begin_ex(ob, "Dynamic topology disable");
       SCULPT_undo_push_node(ob, NULL, SCULPT_UNDO_DYNTOPO_END);
     }
     SCULPT_dynamic_topology_disable_ex(bmain, depsgraph, scene, ob, NULL);
@@ -289,7 +251,7 @@ static void sculpt_dynamic_topology_enable_with_undo(Main *bmain,
     /* May be false in background mode. */
     const bool use_undo = G.background ? (ED_undo_stack_get() != NULL) : true;
     if (use_undo) {
-      SCULPT_undo_push_begin(ob, "Dynamic topology enable");
+      SCULPT_undo_push_begin_ex(ob, "Dynamic topology enable");
     }
     SCULPT_dynamic_topology_enable_ex(bmain, depsgraph, scene, ob);
     if (use_undo) {
diff --git a/source/blender/editors/sculpt_paint/sculpt_expand.c b/source/blender/editors/sculpt_paint/sculpt_expand.c
index 9648f558049..72b0b3a97fe 100644
--- a/source/blender/editors/sculpt_paint/sculpt_expand.c
+++ b/source/blender/editors/sculpt_paint/sculpt_expand.c
@@ -17,6 +17,7 @@
 #include "DNA_brush_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_meshdata_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_object_types.h"
 
 #include "BKE_brush.h"
@@ -140,10 +141,12 @@ enum {
  */
 static bool sculpt_expand_is_vert_in_active_component(SculptSession *ss,
                                                       ExpandCache *expand_cache,
-                                                      const int v)
+                                                      const PBVHVertRef v)
 {
+  int v_i = BKE_pbvh_vertex_to_index(ss->pbvh, v);
+
   for (int i = 0; i < EXPAND_SYMM_AREAS; i++) {
-    if (ss->vertex_info.connected_component[v] == expand_cache->active_connected_components[i]) {
+    if (ss->vertex_info.connected_component[v_i] == expand_cache->active_connected_components[i]) {
       return true;
     }
   }
@@ -158,7 +161,7 @@ static bool sculpt_expand_is_face_in_active_component(SculptSession *ss,
                                                       const int f)
 {
   const MLoop *loop = &ss->mloop[ss->mpoly[f].loopstart];
-  return sculpt_expand_is_vert_in_active_component(ss, expand_cache, loop->v);
+  return sculpt_expand_is_vert_in_active_component(ss, expand_cache, BKE_pbvh_make_vref(loop->v));
 }
 
 /**
@@ -167,14 +170,16 @@ static bool sculpt_expand_is_face_in_active_component(SculptSession *ss,
  */
 static float sculpt_expand_falloff_value_vertex_get(SculptSession *ss,
                                                     ExpandCache *expand_cache,
-                                                    const int v)
+                                                    const PBVHVertRef v)
 {
+  int v_i = BKE_pbvh_vertex_to_index(ss->pbvh, v);
+
   if (expand_cache->texture_distortion_strength == 0.0f) {
-    return expand_cache->vert_falloff[v];
+    return expand_cache->vert_falloff[v_i];
   }
 
   if (!expand_cache->brush->mtex.tex) {
-    return expand_cache->vert_falloff[v];
+    return expand_cache->vert_falloff[v_i];
   }
 
   float rgba[4];
@@ -184,7 +189,7 @@ static float sculpt_expand_falloff_value_vertex_get(SculptSession *ss,
 
   const float distortion = (avg - 0.5f) * expand_cache->texture_distortion_strength *
                            expand_cache->max_vert_falloff;
-  return expand_cache->vert_falloff[v] + distortion;
+  return expand_cache->vert_falloff[v_i] + distortion;
 }
 
 /**
@@ -209,7 +214,9 @@ static float sculpt_expand_max_vertex_falloff_get(ExpandCache *expand_cache)
  * Main function to get the state of a vertex for the current state and settings of a #ExpandCache.
  * Returns true when the target data should be modified by expand.
  */
-static bool sculpt_expand_state_get(SculptSession *ss, ExpandCache *expand_cache, const int v)
+static bool sculpt_expand_state_get(SculptSession *ss,
+                                    ExpandCache *expand_cache,
+                                    const PBVHVertRef v)
 {
   if (!SCULPT_vertex_visible_get(ss, v)) {
     return false;
@@ -303,7 +310,7 @@ static bool sculpt_expand_face_state_get(SculptSession *ss, ExpandCache *expand_
  */
 static float sculpt_expand_gradient_value_get(SculptSession *ss,
                                               ExpandCache *expand_cache,
-                                              const int v)
+                                              const PBVHVertRef v)
 {
   if (!expand_cache->falloff_gradient) {
     return 1.0f;
@@ -345,12 +352,13 @@ static float sculpt_expand_gradient_value_get(SculptSession *ss,
 static BLI_bitmap *sculpt_expand_bitmap_from_enabled(SculptSession *ss, ExpandCache *expand_cache)
 {
   const int totvert = SCULPT_vertex_count_get(ss);
-  BLI_bitmap *enabled_vertices = BLI_BITMAP_NEW(totvert, "enabled vertices");
+  BLI_bitmap *enabled_verts = BLI_BITMAP_NEW(totvert, "enabled verts");
   for (int i = 0; i < totvert; i++) {
-    const bool enabled = sculpt_expand_state_get(ss, expand_cache, i);
-    BLI_BITMAP_SET(enabled_vertices, i, enabled);
+    const bool enabled = sculpt_expand_state_get(
+        ss, expand_cache, BKE_pbvh_index_to_vertex(ss->pbvh, i));
+    BLI_BITMAP_SET(enabled_verts, i, enabled);
   }
-  return enabled_vertices;
+  return enabled_verts;
 }
 
 /**
@@ -359,33 +367,35 @@ static BLI_bitmap *sculpt_expand_bitmap_from_enabled(SculptSession *ss, ExpandCa
  * vertex that is not enabled.
  */
 static BLI_bitmap *sculpt_expand_boundary_from_enabled(SculptSession *ss,
-                                                       const BLI_bitmap *enabled_vertices,
+                                                       const BLI_bitmap *enabled_verts,
                                                        const bool use_mesh_boundary)
 {
   const int totvert = SCULPT_vertex_count_get(ss);
-  BLI_bitmap *boundary_vertices = BLI_BITMAP_NEW(totvert, "boundary vertices");
+  BLI_bitmap *boundary_verts = BLI_BITMAP_NEW(totvert, "boundary verts");
   for (int i = 0; i < totvert; i++) {
-    if (!BLI_BITMAP_TEST(enabled_vertices, i)) {
+    if (!BLI_BITMAP_TEST(enabled_verts, i)) {
       continue;
     }
 
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     bool is_expand_boundary = false;
     SculptVertexNeighborIter ni;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
-      if (!BLI_BITMAP_TEST(enabled_vertices, ni.index)) {
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
+      if (!BLI_BITMAP_TEST(enabled_verts, ni.index)) {
         is_expand_boundary = true;
       }
     }
     SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
 
-    if (use_mesh_boundary && SCULPT_vertex_is_boundary(ss, i)) {
+    if (use_mesh_boundary && SCULPT_vertex_is_boundary(ss, vertex)) {
       is_expand_boundary = true;
     }
 
-    BLI_BITMAP_SET(boundary_vertices, i, is_expand_boundary);
+    BLI_BITMAP_SET(boundary_verts, i, is_expand_boundary);
   }
 
-  return boundary_vertices;
+  return boundary_verts;
 }
 
 /* Functions implementing different algorithms for initializing falloff values. */
@@ -394,12 +404,12 @@ static BLI_bitmap *sculpt_expand_boundary_from_enabled(SculptSession *ss,
  * Utility function to get the closet vertex after flipping an original vertex position based on
  * an symmetry pass iteration index.
  */
-static int sculpt_expand_get_vertex_index_for_symmetry_pass(Object *ob,
-                                                            const char symm_it,
-                                                            const int original_vertex)
+static PBVHVertRef sculpt_expand_get_vertex_index_for_symmetry_pass(
+    Object *ob, const char symm_it, const PBVHVertRef original_vertex)
 {
   SculptSession *ss = ob->sculpt;
-  int symm_vertex = SCULPT_EXPAND_VERTEX_NONE;
+  PBVHVertRef symm_vertex = {SCULPT_EXPAND_VERTEX_NONE};
+
   if (symm_it == 0) {
     symm_vertex = original_vertex;
   }
@@ -415,7 +425,7 @@ static int sculpt_expand_get_vertex_index_for_symmetry_pass(Object *ob,
  * Geodesic: Initializes the falloff with geodesic distances from the given active vertex, taking
  * symmetry into account.
  */
-static float *sculpt_expand_geodesic_falloff_create(Sculpt *sd, Object *ob, const int v)
+static float *sculpt_expand_geodesic_falloff_create(Sculpt *sd, Object *ob, const PBVHVertRef v)
 {
   return SCULPT_geodesic_from_vertex_and_symm(sd, ob, v, FLT_MAX);
 }
@@ -432,20 +442,23 @@ typedef struct ExpandFloodFillData {
 } ExpandFloodFillData;
 
 static bool expand_topology_floodfill_cb(
-    SculptSession *UNUSED(ss), int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   ExpandFloodFillData *data = userdata;
   if (!is_duplicate) {
-    const float to_it = data->dists[from_v] + 1.0f;
-    data->dists[to_v] = to_it;
+    const float to_it = data->dists[from_v_i] + 1.0f;
+    data->dists[to_v_i] = to_it;
   }
   else {
-    data->dists[to_v] = data->dists[from_v];
+    data->dists[to_v_i] = data->dists[from_v_i];
   }
   return true;
 }
 
-static float *sculpt_expand_topology_falloff_create(Sculpt *sd, Object *ob, const int v)
+static float *sculpt_expand_topology_falloff_create(Sculpt *sd, Object *ob, const PBVHVertRef v)
 {
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
@@ -470,23 +483,26 @@ static float *sculpt_expand_topology_falloff_create(Sculpt *sd, Object *ob, cons
  * This creates falloff patterns that follow and snap to the hard edges of the object.
  */
 static bool mask_expand_normal_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   ExpandFloodFillData *data = userdata;
   if (!is_duplicate) {
     float current_normal[3], prev_normal[3];
     SCULPT_vertex_normal_get(ss, to_v, current_normal);
     SCULPT_vertex_normal_get(ss, from_v, prev_normal);
-    const float from_edge_factor = data->edge_factor[from_v];
-    data->edge_factor[to_v] = dot_v3v3(current_normal, prev_normal) * from_edge_factor;
-    data->dists[to_v] = dot_v3v3(data->original_normal, current_normal) *
-                        powf(from_edge_factor, data->edge_sensitivity);
-    CLAMP(data->dists[to_v], 0.0f, 1.0f);
+    const float from_edge_factor = data->edge_factor[from_v_i];
+    data->edge_factor[to_v_i] = dot_v3v3(current_normal, prev_normal) * from_edge_factor;
+    data->dists[to_v_i] = dot_v3v3(data->original_normal, current_normal) *
+                          powf(from_edge_factor, data->edge_sensitivity);
+    CLAMP(data->dists[to_v_i], 0.0f, 1.0f);
   }
   else {
     /* PBVH_GRIDS duplicate handling. */
-    data->edge_factor[to_v] = data->edge_factor[from_v];
-    data->dists[to_v] = data->dists[from_v];
+    data->edge_factor[to_v_i] = data->edge_factor[from_v_i];
+    data->dists[to_v_i] = data->dists[from_v_i];
   }
 
   return true;
@@ -494,7 +510,7 @@ static bool mask_expand_normal_floodfill_cb(
 
 static float *sculpt_expand_normal_falloff_create(Sculpt *sd,
                                                   Object *ob,
-                                                  const int v,
+                                                  const PBVHVertRef v,
                                                   const float edge_sensitivity)
 {
   SculptSession *ss = ob->sculpt;
@@ -520,9 +536,11 @@ static float *sculpt_expand_normal_falloff_create(Sculpt *sd,
 
   for (int repeat = 0; repeat < 2; repeat++) {
     for (int i = 0; i < totvert; i++) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
       float avg = 0.0f;
       SculptVertexNeighborIter ni;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
         avg += dists[ni.index];
       }
       SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
@@ -539,7 +557,7 @@ static float *sculpt_expand_normal_falloff_create(Sculpt *sd,
  * Spherical: Initializes the falloff based on the distance from a vertex, taking symmetry into
  * account.
  */
-static float *sculpt_expand_spherical_falloff_create(Object *ob, const int v)
+static float *sculpt_expand_spherical_falloff_create(Object *ob, const PBVHVertRef v)
 {
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
@@ -554,11 +572,14 @@ static float *sculpt_expand_spherical_falloff_create(Object *ob, const int v)
     if (!SCULPT_is_symmetry_iteration_valid(symm_it, symm)) {
       continue;
     }
-    const int symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(ob, symm_it, v);
-    if (symm_vertex != -1) {
+    const PBVHVertRef symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(
+        ob, symm_it, v);
+    if (symm_vertex.i != SCULPT_EXPAND_VERTEX_NONE) {
       const float *co = SCULPT_vertex_co_get(ss, symm_vertex);
       for (int i = 0; i < totvert; i++) {
-        dists[i] = min_ff(dists[i], len_v3v3(co, SCULPT_vertex_co_get(ss, i)));
+        PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+        dists[i] = min_ff(dists[i], len_v3v3(co, SCULPT_vertex_co_get(ss, vertex)));
       }
     }
   }
@@ -571,13 +592,13 @@ static float *sculpt_expand_spherical_falloff_create(Object *ob, const int v)
  * boundary to a falloff value of 0. Then, it propagates that falloff to the rest of the mesh so it
  * stays parallel to the boundary, increasing the falloff value by 1 on each step.
  */
-static float *sculpt_expand_boundary_topology_falloff_create(Object *ob, const int v)
+static float *sculpt_expand_boundary_topology_falloff_create(Object *ob, const PBVHVertRef v)
 {
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
   float *dists = MEM_calloc_arrayN(totvert, sizeof(float), "spherical dist");
-  BLI_bitmap *visited_vertices = BLI_BITMAP_NEW(totvert, "visited vertices");
-  GSQueue *queue = BLI_gsqueue_new(sizeof(int));
+  BLI_bitmap *visited_verts = BLI_BITMAP_NEW(totvert, "visited verts");
+  GSQueue *queue = BLI_gsqueue_new(sizeof(PBVHVertRef));
 
   /* Search and initialize a boundary per symmetry pass, then mark those vertices as visited. */
   const char symm = SCULPT_mesh_symmetry_xyz_get(ob);
@@ -586,16 +607,17 @@ static float *sculpt_expand_boundary_topology_falloff_create(Object *ob, const i
       continue;
     }
 
-    const int symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(ob, symm_it, v);
+    const PBVHVertRef symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(
+        ob, symm_it, v);
 
     SculptBoundary *boundary = SCULPT_boundary_data_init(ob, NULL, symm_vertex, FLT_MAX);
     if (!boundary) {
       continue;
     }
 
-    for (int i = 0; i < boundary->num_vertices; i++) {
-      BLI_gsqueue_push(queue, &boundary->vertices[i]);
-      BLI_BITMAP_ENABLE(visited_vertices, boundary->vertices[i]);
+    for (int i = 0; i < boundary->verts_num; i++) {
+      BLI_gsqueue_push(queue, &boundary->verts[i]);
+      BLI_BITMAP_ENABLE(visited_verts, BKE_pbvh_vertex_to_index(ss->pbvh, boundary->verts[i]));
     }
     SCULPT_boundary_data_free(boundary);
   }
@@ -607,23 +629,25 @@ static float *sculpt_expand_boundary_topology_falloff_create(Object *ob, const i
 
   /* Propagate the values from the boundaries to the rest of the mesh. */
   while (!BLI_gsqueue_is_empty(queue)) {
-    int v_next;
+    PBVHVertRef v_next;
+
     BLI_gsqueue_pop(queue, &v_next);
+    int v_next_i = BKE_pbvh_vertex_to_index(ss->pbvh, v_next);
 
     SculptVertexNeighborIter ni;
     SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, v_next, ni) {
-      if (BLI_BITMAP_TEST(visited_vertices, ni.index)) {
+      if (BLI_BITMAP_TEST(visited_verts, ni.index)) {
         continue;
       }
-      dists[ni.index] = dists[v_next] + 1.0f;
-      BLI_BITMAP_ENABLE(visited_vertices, ni.index);
-      BLI_gsqueue_push(queue, &ni.index);
+      dists[ni.index] = dists[v_next_i] + 1.0f;
+      BLI_BITMAP_ENABLE(visited_verts, ni.index);
+      BLI_gsqueue_push(queue, &ni.vertex);
     }
     SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
   }
 
   BLI_gsqueue_free(queue);
-  MEM_freeN(visited_vertices);
+  MEM_freeN(visited_verts);
   return dists;
 }
 
@@ -632,7 +656,7 @@ static float *sculpt_expand_boundary_topology_falloff_create(Object *ob, const i
  * the base mesh faces when checking a vertex neighbor. For this reason, this is not implement
  * using the general flood-fill and sculpt neighbors accessors.
  */
-static float *sculpt_expand_diagonals_falloff_create(Object *ob, const int v)
+static float *sculpt_expand_diagonals_falloff_create(Object *ob, const PBVHVertRef v)
 {
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
@@ -646,18 +670,20 @@ static float *sculpt_expand_diagonals_falloff_create(Object *ob, const int v)
   }
 
   /* Search and mask as visited the initial vertices using the enabled symmetry passes. */
-  BLI_bitmap *visited_vertices = BLI_BITMAP_NEW(totvert, "visited vertices");
-  GSQueue *queue = BLI_gsqueue_new(sizeof(int));
+  BLI_bitmap *visited_verts = BLI_BITMAP_NEW(totvert, "visited verts");
+  GSQueue *queue = BLI_gsqueue_new(sizeof(PBVHVertRef));
   const char symm = SCULPT_mesh_symmetry_xyz_get(ob);
   for (char symm_it = 0; symm_it <= symm; symm_it++) {
     if (!SCULPT_is_symmetry_iteration_valid(symm_it, symm)) {
       continue;
     }
 
-    const int symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(ob, symm_it, v);
+    const PBVHVertRef symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(
+        ob, symm_it, v);
+    int symm_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, symm_vertex);
 
     BLI_gsqueue_push(queue, &symm_vertex);
-    BLI_BITMAP_ENABLE(visited_vertices, symm_vertex);
+    BLI_BITMAP_ENABLE(visited_verts, symm_vertex_i);
   }
 
   if (BLI_gsqueue_is_empty(queue)) {
@@ -665,26 +691,28 @@ static float *sculpt_expand_diagonals_falloff_create(Object *ob, const int v)
   }
 
   /* Propagate the falloff increasing the value by 1 each time a new vertex is visited. */
-  Mesh *mesh = ob->data;
   while (!BLI_gsqueue_is_empty(queue)) {
-    int v_next;
+    PBVHVertRef v_next;
     BLI_gsqueue_pop(queue, &v_next);
-    for (int j = 0; j < ss->pmap[v_next].count; j++) {
-      MPoly *p = &ss->mpoly[ss->pmap[v_next].indices[j]];
+
+    int v_next_i = BKE_pbvh_vertex_to_index(ss->pbvh, v_next);
+
+    for (int j = 0; j < ss->pmap[v_next_i].count; j++) {
+      const MPoly *p = &ss->mpoly[ss->pmap[v_next_i].indices[j]];
       for (int l = 0; l < p->totloop; l++) {
-        const int neighbor_v = mesh->mloop[p->loopstart + l].v;
-        if (BLI_BITMAP_TEST(visited_vertices, neighbor_v)) {
+        const PBVHVertRef neighbor_v = BKE_pbvh_make_vref(ss->mloop[p->loopstart + l].v);
+        if (BLI_BITMAP_TEST(visited_verts, neighbor_v.i)) {
           continue;
         }
-        dists[neighbor_v] = dists[v_next] + 1.0f;
-        BLI_BITMAP_ENABLE(visited_vertices, neighbor_v);
+        dists[neighbor_v.i] = dists[v_next_i] + 1.0f;
+        BLI_BITMAP_ENABLE(visited_verts, neighbor_v.i);
         BLI_gsqueue_push(queue, &neighbor_v);
       }
     }
   }
 
   BLI_gsqueue_free(queue);
-  MEM_freeN(visited_vertices);
+  MEM_freeN(visited_verts);
   return dists;
 }
 
@@ -701,11 +729,13 @@ static void sculpt_expand_update_max_vert_falloff_value(SculptSession *ss,
   const int totvert = SCULPT_vertex_count_get(ss);
   expand_cache->max_vert_falloff = -FLT_MAX;
   for (int i = 0; i < totvert; i++) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     if (expand_cache->vert_falloff[i] == FLT_MAX) {
       continue;
     }
 
-    if (!sculpt_expand_is_vert_in_active_component(ss, expand_cache, i)) {
+    if (!sculpt_expand_is_vert_in_active_component(ss, expand_cache, vertex)) {
       continue;
     }
 
@@ -747,11 +777,11 @@ static void sculpt_expand_grids_to_faces_falloff(SculptSession *ss,
                                                  Mesh *mesh,
                                                  ExpandCache *expand_cache)
 {
-
+  const MPoly *polys = BKE_mesh_polys(mesh);
   const CCGKey *key = BKE_pbvh_get_grid_key(ss->pbvh);
 
   for (int p = 0; p < mesh->totpoly; p++) {
-    MPoly *poly = &mesh->mpoly[p];
+    const MPoly *poly = &polys[p];
     float accum = 0.0f;
     for (int l = 0; l < poly->totloop; l++) {
       const int grid_loop_index = (poly->loopstart + l) * key->grid_area;
@@ -765,11 +795,14 @@ static void sculpt_expand_grids_to_faces_falloff(SculptSession *ss,
 
 static void sculpt_expand_vertex_to_faces_falloff(Mesh *mesh, ExpandCache *expand_cache)
 {
+  const MPoly *polys = BKE_mesh_polys(mesh);
+  const MLoop *loops = BKE_mesh_loops(mesh);
+
   for (int p = 0; p < mesh->totpoly; p++) {
-    MPoly *poly = &mesh->mpoly[p];
+    const MPoly *poly = &polys[p];
     float accum = 0.0f;
     for (int l = 0; l < poly->totloop; l++) {
-      MLoop *loop = &mesh->mloop[l + poly->loopstart];
+      const MLoop *loop = &loops[l + poly->loopstart];
       accum += expand_cache->vert_falloff[loop->v];
     }
     expand_cache->face_falloff[p] = accum / poly->totloop;
@@ -810,27 +843,27 @@ static void sculpt_expand_mesh_face_falloff_from_vertex_falloff(SculptSession *s
  */
 static void sculpt_expand_geodesics_from_state_boundary(Object *ob,
                                                         ExpandCache *expand_cache,
-                                                        BLI_bitmap *enabled_vertices)
+                                                        BLI_bitmap *enabled_verts)
 {
   SculptSession *ss = ob->sculpt;
   BLI_assert(BKE_pbvh_type(ss->pbvh) == PBVH_FACES);
 
-  GSet *initial_vertices = BLI_gset_int_new("initial_vertices");
-  BLI_bitmap *boundary_vertices = sculpt_expand_boundary_from_enabled(ss, enabled_vertices, false);
+  GSet *initial_verts = BLI_gset_int_new("initial_verts");
+  BLI_bitmap *boundary_verts = sculpt_expand_boundary_from_enabled(ss, enabled_verts, false);
   const int totvert = SCULPT_vertex_count_get(ss);
   for (int i = 0; i < totvert; i++) {
-    if (!BLI_BITMAP_TEST(boundary_vertices, i)) {
+    if (!BLI_BITMAP_TEST(boundary_verts, i)) {
       continue;
     }
-    BLI_gset_add(initial_vertices, POINTER_FROM_INT(i));
+    BLI_gset_add(initial_verts, POINTER_FROM_INT(i));
   }
-  MEM_freeN(boundary_vertices);
+  MEM_freeN(boundary_verts);
 
   MEM_SAFE_FREE(expand_cache->vert_falloff);
   MEM_SAFE_FREE(expand_cache->face_falloff);
 
-  expand_cache->vert_falloff = SCULPT_geodesic_distances_create(ob, initial_vertices, FLT_MAX);
-  BLI_gset_free(initial_vertices, NULL);
+  expand_cache->vert_falloff = SCULPT_geodesic_distances_create(ob, initial_verts, FLT_MAX);
+  BLI_gset_free(initial_verts, NULL);
 }
 
 /**
@@ -839,7 +872,7 @@ static void sculpt_expand_geodesics_from_state_boundary(Object *ob,
  */
 static void sculpt_expand_topology_from_state_boundary(Object *ob,
                                                        ExpandCache *expand_cache,
-                                                       BLI_bitmap *enabled_vertices)
+                                                       BLI_bitmap *enabled_verts)
 {
   MEM_SAFE_FREE(expand_cache->vert_falloff);
   MEM_SAFE_FREE(expand_cache->face_falloff);
@@ -848,17 +881,19 @@ static void sculpt_expand_topology_from_state_boundary(Object *ob,
   const int totvert = SCULPT_vertex_count_get(ss);
 
   float *dists = MEM_calloc_arrayN(totvert, sizeof(float), "topology dist");
-  BLI_bitmap *boundary_vertices = sculpt_expand_boundary_from_enabled(ss, enabled_vertices, false);
+  BLI_bitmap *boundary_verts = sculpt_expand_boundary_from_enabled(ss, enabled_verts, false);
 
   SculptFloodFill flood;
   SCULPT_floodfill_init(ss, &flood);
   for (int i = 0; i < totvert; i++) {
-    if (!BLI_BITMAP_TEST(boundary_vertices, i)) {
+    if (!BLI_BITMAP_TEST(boundary_verts, i)) {
       continue;
     }
-    SCULPT_floodfill_add_and_skip_initial(&flood, i);
+
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+    SCULPT_floodfill_add_and_skip_initial(&flood, vertex);
   }
-  MEM_freeN(boundary_vertices);
+  MEM_freeN(boundary_verts);
 
   ExpandFloodFillData fdata;
   fdata.dists = dists;
@@ -880,7 +915,7 @@ static void sculpt_expand_resursion_step_add(Object *ob,
     return;
   }
 
-  BLI_bitmap *enabled_vertices = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
+  BLI_bitmap *enabled_verts = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
 
   /* Each time a new recursion step is created, reset the distortion strength. This is the expected
    * result from the recursion, as otherwise the new falloff will render with undesired distortion
@@ -889,10 +924,10 @@ static void sculpt_expand_resursion_step_add(Object *ob,
 
   switch (recursion_type) {
     case SCULPT_EXPAND_RECURSION_GEODESICS:
-      sculpt_expand_geodesics_from_state_boundary(ob, expand_cache, enabled_vertices);
+      sculpt_expand_geodesics_from_state_boundary(ob, expand_cache, enabled_verts);
       break;
     case SCULPT_EXPAND_RECURSION_TOPOLOGY:
-      sculpt_expand_topology_from_state_boundary(ob, expand_cache, enabled_vertices);
+      sculpt_expand_topology_from_state_boundary(ob, expand_cache, enabled_verts);
       break;
   }
 
@@ -902,7 +937,7 @@ static void sculpt_expand_resursion_step_add(Object *ob,
     sculpt_expand_update_max_face_falloff_factor(ss, expand_cache);
   }
 
-  MEM_freeN(enabled_vertices);
+  MEM_freeN(enabled_verts);
 }
 
 /* Face Set Boundary falloff. */
@@ -919,30 +954,34 @@ static void sculpt_expand_initialize_from_face_set_boundary(Object *ob,
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
 
-  BLI_bitmap *enabled_vertices = BLI_BITMAP_NEW(totvert, "enabled vertices");
+  BLI_bitmap *enabled_verts = BLI_BITMAP_NEW(totvert, "enabled verts");
   for (int i = 0; i < totvert; i++) {
-    if (!SCULPT_vertex_has_unique_face_set(ss, i)) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    if (!SCULPT_vertex_has_unique_face_set(ss, vertex)) {
       continue;
     }
-    if (!SCULPT_vertex_has_face_set(ss, i, active_face_set)) {
+    if (!SCULPT_vertex_has_face_set(ss, vertex, active_face_set)) {
       continue;
     }
-    BLI_BITMAP_ENABLE(enabled_vertices, i);
+    BLI_BITMAP_ENABLE(enabled_verts, i);
   }
 
   if (BKE_pbvh_type(ss->pbvh) == PBVH_FACES) {
-    sculpt_expand_geodesics_from_state_boundary(ob, expand_cache, enabled_vertices);
+    sculpt_expand_geodesics_from_state_boundary(ob, expand_cache, enabled_verts);
   }
   else {
-    sculpt_expand_topology_from_state_boundary(ob, expand_cache, enabled_vertices);
+    sculpt_expand_topology_from_state_boundary(ob, expand_cache, enabled_verts);
   }
 
-  MEM_freeN(enabled_vertices);
+  MEM_freeN(enabled_verts);
 
   if (internal_falloff) {
     for (int i = 0; i < totvert; i++) {
-      if (!(SCULPT_vertex_has_face_set(ss, i, active_face_set) &&
-            SCULPT_vertex_has_unique_face_set(ss, i))) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      if (!(SCULPT_vertex_has_face_set(ss, vertex, active_face_set) &&
+            SCULPT_vertex_has_unique_face_set(ss, vertex))) {
         continue;
       }
       expand_cache->vert_falloff[i] *= -1.0f;
@@ -960,7 +999,9 @@ static void sculpt_expand_initialize_from_face_set_boundary(Object *ob,
   }
   else {
     for (int i = 0; i < totvert; i++) {
-      if (!SCULPT_vertex_has_face_set(ss, i, active_face_set)) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      if (!SCULPT_vertex_has_face_set(ss, vertex, active_face_set)) {
         continue;
       }
       expand_cache->vert_falloff[i] = 0.0f;
@@ -976,7 +1017,7 @@ static void sculpt_expand_falloff_factors_from_vertex_and_symm_create(
     ExpandCache *expand_cache,
     Sculpt *sd,
     Object *ob,
-    const int v,
+    const PBVHVertRef v,
     eSculptExpandFalloffType falloff_type)
 {
   MEM_SAFE_FREE(expand_cache->vert_falloff);
@@ -1046,7 +1087,7 @@ static void sculpt_expand_snap_initialize_from_enabled(SculptSession *ss,
   expand_cache->snap = false;
   expand_cache->invert = false;
 
-  BLI_bitmap *enabled_vertices = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
+  BLI_bitmap *enabled_verts = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
 
   const int totface = ss->totfaces;
   for (int i = 0; i < totface; i++) {
@@ -1055,11 +1096,11 @@ static void sculpt_expand_snap_initialize_from_enabled(SculptSession *ss,
   }
 
   for (int p = 0; p < totface; p++) {
-    MPoly *poly = &ss->mpoly[p];
+    const MPoly *poly = &ss->mpoly[p];
     bool any_disabled = false;
     for (int l = 0; l < poly->totloop; l++) {
-      MLoop *loop = &ss->mloop[l + poly->loopstart];
-      if (!BLI_BITMAP_TEST(enabled_vertices, loop->v)) {
+      const MLoop *loop = &ss->mloop[l + poly->loopstart];
+      if (!BLI_BITMAP_TEST(enabled_verts, loop->v)) {
         any_disabled = true;
         break;
       }
@@ -1070,7 +1111,7 @@ static void sculpt_expand_snap_initialize_from_enabled(SculptSession *ss,
     }
   }
 
-  MEM_freeN(enabled_vertices);
+  MEM_freeN(enabled_verts);
   expand_cache->snap = prev_snap_state;
   expand_cache->invert = prev_invert_state;
 }
@@ -1128,7 +1169,7 @@ static void sculpt_expand_restore_color_data(SculptSession *ss, ExpandCache *exp
     PBVHNode *node = nodes[n];
     PBVHVertexIter vd;
     BKE_pbvh_vertex_iter_begin (ss->pbvh, node, vd, PBVH_ITER_UNIQUE) {
-      SCULPT_vertex_color_set(ss, vd.index, expand_cache->original_colors[vd.index]);
+      SCULPT_vertex_color_set(ss, vd.vertex, expand_cache->original_colors[vd.index]);
     }
     BKE_pbvh_vertex_iter_end;
     BKE_pbvh_node_mark_redraw(node);
@@ -1215,12 +1256,12 @@ static void sculpt_expand_mask_update_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, node, vd, PBVH_ITER_ALL) {
     const float initial_mask = *vd.mask;
-    const bool enabled = sculpt_expand_state_get(ss, expand_cache, vd.index);
+    const bool enabled = sculpt_expand_state_get(ss, expand_cache, vd.vertex);
 
     float new_mask;
 
     if (enabled) {
-      new_mask = sculpt_expand_gradient_value_get(ss, expand_cache, vd.index);
+      new_mask = sculpt_expand_gradient_value_get(ss, expand_cache, vd.vertex);
     }
     else {
       new_mask = 0.0f;
@@ -1236,9 +1277,6 @@ static void sculpt_expand_mask_update_task_cb(void *__restrict userdata,
 
     *vd.mask = clamp_f(new_mask, 0.0f, 1.0f);
     any_changed = true;
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
   if (any_changed) {
@@ -1287,13 +1325,13 @@ static void sculpt_expand_colors_update_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, node, vd, PBVH_ITER_ALL) {
     float initial_color[4];
-    SCULPT_vertex_color_get(ss, vd.index, initial_color);
+    SCULPT_vertex_color_get(ss, vd.vertex, initial_color);
 
-    const bool enabled = sculpt_expand_state_get(ss, expand_cache, vd.index);
+    const bool enabled = sculpt_expand_state_get(ss, expand_cache, vd.vertex);
     float fade;
 
     if (enabled) {
-      fade = sculpt_expand_gradient_value_get(ss, expand_cache, vd.index);
+      fade = sculpt_expand_gradient_value_get(ss, expand_cache, vd.vertex);
     }
     else {
       fade = 0.0f;
@@ -1314,12 +1352,9 @@ static void sculpt_expand_colors_update_task_cb(void *__restrict userdata,
       continue;
     }
 
-    SCULPT_vertex_color_set(ss, vd.index, final_color);
+    SCULPT_vertex_color_set(ss, vd.vertex, final_color);
 
     any_changed = true;
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
   if (any_changed) {
@@ -1356,22 +1391,32 @@ static void sculpt_expand_original_state_store(Object *ob, ExpandCache *expand_c
   /* Face Sets are always stored as they are needed for snapping. */
   expand_cache->initial_face_sets = MEM_malloc_arrayN(totface, sizeof(int), "initial face set");
   expand_cache->original_face_sets = MEM_malloc_arrayN(totface, sizeof(int), "original face set");
-  for (int i = 0; i < totface; i++) {
-    expand_cache->initial_face_sets[i] = ss->face_sets[i];
-    expand_cache->original_face_sets[i] = ss->face_sets[i];
+  if (ss->face_sets) {
+    for (int i = 0; i < totface; i++) {
+      expand_cache->initial_face_sets[i] = ss->face_sets[i];
+      expand_cache->original_face_sets[i] = ss->face_sets[i];
+    }
+  }
+  else {
+    memset(expand_cache->initial_face_sets, SCULPT_FACE_SET_NONE, sizeof(int) * totface);
+    memset(expand_cache->original_face_sets, SCULPT_FACE_SET_NONE, sizeof(int) * totface);
   }
 
   if (expand_cache->target == SCULPT_EXPAND_TARGET_MASK) {
     expand_cache->original_mask = MEM_malloc_arrayN(totvert, sizeof(float), "initial mask");
     for (int i = 0; i < totvert; i++) {
-      expand_cache->original_mask[i] = SCULPT_vertex_mask_get(ss, i);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      expand_cache->original_mask[i] = SCULPT_vertex_mask_get(ss, vertex);
     }
   }
 
   if (expand_cache->target == SCULPT_EXPAND_TARGET_COLORS) {
     expand_cache->original_colors = MEM_malloc_arrayN(totvert, sizeof(float[4]), "initial colors");
     for (int i = 0; i < totvert; i++) {
-      SCULPT_vertex_color_get(ss, i, expand_cache->original_colors[i]);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      SCULPT_vertex_color_get(ss, vertex, expand_cache->original_colors[i]);
     }
   }
 }
@@ -1394,14 +1439,16 @@ static void sculpt_expand_face_sets_restore(SculptSession *ss, ExpandCache *expa
   }
 }
 
-static void sculpt_expand_update_for_vertex(bContext *C, Object *ob, const int vertex)
+static void sculpt_expand_update_for_vertex(bContext *C, Object *ob, const PBVHVertRef vertex)
 {
   SculptSession *ss = ob->sculpt;
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   ExpandCache *expand_cache = ss->expand_cache;
 
+  int vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, vertex);
+
   /* Update the active factor in the cache. */
-  if (vertex == SCULPT_EXPAND_VERTEX_NONE) {
+  if (vertex.i == SCULPT_EXPAND_VERTEX_NONE) {
     /* This means that the cursor is not over the mesh, so a valid active falloff can't be
      * determined. In this situations, don't evaluate enabled states and default all vertices in
      * connected components to enabled. */
@@ -1409,7 +1456,7 @@ static void sculpt_expand_update_for_vertex(bContext *C, Object *ob, const int v
     expand_cache->all_enabled = true;
   }
   else {
-    expand_cache->active_falloff = expand_cache->vert_falloff[vertex];
+    expand_cache->active_falloff = expand_cache->vert_falloff[vertex_i];
     expand_cache->all_enabled = false;
   }
 
@@ -1450,14 +1497,16 @@ static void sculpt_expand_update_for_vertex(bContext *C, Object *ob, const int v
  * Updates the #SculptSession cursor data and gets the active vertex
  * if the cursor is over the mesh.
  */
-static int sculpt_expand_target_vertex_update_and_get(bContext *C, Object *ob, const float mval[2])
+static PBVHVertRef sculpt_expand_target_vertex_update_and_get(bContext *C,
+                                                              Object *ob,
+                                                              const float mval[2])
 {
   SculptSession *ss = ob->sculpt;
   SculptCursorGeometryInfo sgi;
   if (SCULPT_cursor_geometry_info_update(C, &sgi, mval, false)) {
     return SCULPT_active_vertex_get(ss);
   }
-  return SCULPT_EXPAND_VERTEX_NONE;
+  return BKE_pbvh_make_vref(SCULPT_EXPAND_VERTEX_NONE);
 }
 
 /**
@@ -1472,7 +1521,7 @@ static void sculpt_expand_reposition_pivot(bContext *C, Object *ob, ExpandCache
 
   const bool initial_invert_state = expand_cache->invert;
   expand_cache->invert = false;
-  BLI_bitmap *enabled_vertices = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
+  BLI_bitmap *enabled_verts = sculpt_expand_bitmap_from_enabled(ss, expand_cache);
 
   /* For boundary topology, position the pivot using only the boundary of the enabled vertices,
    * without taking mesh boundary into account. This allows to create deformations like bending the
@@ -1480,8 +1529,8 @@ static void sculpt_expand_reposition_pivot(bContext *C, Object *ob, ExpandCache
   const float use_mesh_boundary = expand_cache->falloff_type !=
                                   SCULPT_EXPAND_FALLOFF_BOUNDARY_TOPOLOGY;
 
-  BLI_bitmap *boundary_vertices = sculpt_expand_boundary_from_enabled(
-      ss, enabled_vertices, use_mesh_boundary);
+  BLI_bitmap *boundary_verts = sculpt_expand_boundary_from_enabled(
+      ss, enabled_verts, use_mesh_boundary);
 
   /* Ignore invert state, as this is the expected behavior in most cases and mask are created in
    * inverted state by default. */
@@ -1493,15 +1542,17 @@ static void sculpt_expand_reposition_pivot(bContext *C, Object *ob, ExpandCache
   const float *expand_init_co = SCULPT_vertex_co_get(ss, expand_cache->initial_active_vertex);
 
   for (int i = 0; i < totvert; i++) {
-    if (!BLI_BITMAP_TEST(boundary_vertices, i)) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    if (!BLI_BITMAP_TEST(boundary_verts, i)) {
       continue;
     }
 
-    if (!sculpt_expand_is_vert_in_active_component(ss, expand_cache, i)) {
+    if (!sculpt_expand_is_vert_in_active_component(ss, expand_cache, vertex)) {
       continue;
     }
 
-    const float *vertex_co = SCULPT_vertex_co_get(ss, i);
+    const float *vertex_co = SCULPT_vertex_co_get(ss, vertex);
 
     if (!SCULPT_check_vertex_pivot_symmetry(vertex_co, expand_init_co, symm)) {
       continue;
@@ -1511,8 +1562,8 @@ static void sculpt_expand_reposition_pivot(bContext *C, Object *ob, ExpandCache
     total++;
   }
 
-  MEM_freeN(enabled_vertices);
-  MEM_freeN(boundary_vertices);
+  MEM_freeN(enabled_verts);
+  MEM_freeN(boundary_verts);
 
   if (total > 0) {
     mul_v3_v3fl(ss->pivot_pos, avg, 1.0f / total);
@@ -1556,9 +1607,8 @@ static void sculpt_expand_finish(bContext *C)
  * Finds and stores in the #ExpandCache the sculpt connected component index for each symmetry pass
  * needed for expand.
  */
-static void sculpt_expand_find_active_connected_components_from_vert(Object *ob,
-                                                                     ExpandCache *expand_cache,
-                                                                     const int initial_vertex)
+static void sculpt_expand_find_active_connected_components_from_vert(
+    Object *ob, ExpandCache *expand_cache, const PBVHVertRef initial_vertex)
 {
   SculptSession *ss = ob->sculpt;
   for (int i = 0; i < EXPAND_SYMM_AREAS; i++) {
@@ -1571,11 +1621,13 @@ static void sculpt_expand_find_active_connected_components_from_vert(Object *ob,
       continue;
     }
 
-    const int symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(
+    const PBVHVertRef symm_vertex = sculpt_expand_get_vertex_index_for_symmetry_pass(
         ob, symm_it, initial_vertex);
 
+    int symm_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, symm_vertex);
+
     expand_cache->active_connected_components[(int)symm_it] =
-        ss->vertex_info.connected_component[symm_vertex];
+        ss->vertex_info.connected_component[symm_vertex_i];
   }
 }
 
@@ -1589,14 +1641,20 @@ static void sculpt_expand_set_initial_components_for_mouse(bContext *C,
                                                            const float mval[2])
 {
   SculptSession *ss = ob->sculpt;
-  int initial_vertex = sculpt_expand_target_vertex_update_and_get(C, ob, mval);
-  if (initial_vertex == SCULPT_EXPAND_VERTEX_NONE) {
+
+  PBVHVertRef initial_vertex = sculpt_expand_target_vertex_update_and_get(C, ob, mval);
+
+  if (initial_vertex.i == SCULPT_EXPAND_VERTEX_NONE) {
     /* Cursor not over the mesh, for creating valid initial falloffs, fallback to the last active
      * vertex in the sculpt session. */
     initial_vertex = SCULPT_active_vertex_get(ss);
   }
+
+  int initial_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, initial_vertex);
+
   copy_v2_v2(ss->expand_cache->initial_mouse, mval);
   expand_cache->initial_active_vertex = initial_vertex;
+  expand_cache->initial_active_vertex_i = initial_vertex_i;
   expand_cache->initial_active_face_set = SCULPT_active_face_set_get(ss);
 
   if (expand_cache->next_face_set == SCULPT_FACE_SET_NONE) {
@@ -1696,7 +1754,8 @@ static int sculpt_expand_modal(bContext *C, wmOperator *op, const wmEvent *event
 
   /* Update and get the active vertex (and face) from the cursor. */
   const float mval_fl[2] = {UNPACK2(event->mval)};
-  const int target_expand_vertex = sculpt_expand_target_vertex_update_and_get(C, ob, mval_fl);
+  const PBVHVertRef target_expand_vertex = sculpt_expand_target_vertex_update_and_get(
+      C, ob, mval_fl);
 
   /* Handle the modal keymap state changes. */
   ExpandCache *expand_cache = ss->expand_cache;
@@ -1888,6 +1947,8 @@ static void sculpt_expand_delete_face_set_id(int *r_face_sets,
 {
   const int totface = ss->totfaces;
   MeshElemMap *pmap = ss->pmap;
+  const MPoly *polys = BKE_mesh_polys(mesh);
+  const MLoop *loops = BKE_mesh_loops(mesh);
 
   /* Check that all the face sets IDs in the mesh are not equal to `delete_id`
    * before attempting to delete it. */
@@ -1922,9 +1983,9 @@ static void sculpt_expand_delete_face_set_id(int *r_face_sets,
     while (BLI_LINKSTACK_SIZE(queue)) {
       const int f_index = POINTER_AS_INT(BLI_LINKSTACK_POP(queue));
       int other_id = delete_id;
-      const MPoly *c_poly = &mesh->mpoly[f_index];
+      const MPoly *c_poly = &polys[f_index];
       for (int l = 0; l < c_poly->totloop; l++) {
-        const MLoop *c_loop = &mesh->mloop[c_poly->loopstart + l];
+        const MLoop *c_loop = &loops[c_poly->loopstart + l];
         const MeshElemMap *vert_map = &pmap[c_loop->v];
         for (int i = 0; i < vert_map->count; i++) {
 
@@ -2064,6 +2125,16 @@ static int sculpt_expand_invoke(bContext *C, wmOperator *op, const wmEvent *even
     return OPERATOR_CANCELLED;
   }
 
+  if (ss->expand_cache->target == SCULPT_EXPAND_TARGET_FACE_SETS) {
+    Mesh *mesh = ob->data;
+    ss->face_sets = BKE_sculpt_face_sets_ensure(mesh);
+  }
+
+  if (ss->expand_cache->target == SCULPT_EXPAND_TARGET_MASK) {
+    MultiresModifierData *mmd = BKE_sculpt_multires_active(ss->scene, ob);
+    BKE_sculpt_mask_layers_ensure(ob, mmd);
+  }
+
   /* Face Set operations are not supported in dyntopo. */
   if (ss->expand_cache->target == SCULPT_EXPAND_TARGET_FACE_SETS &&
       BKE_pbvh_type(ss->pbvh) == PBVH_BMESH) {
@@ -2074,7 +2145,7 @@ static int sculpt_expand_invoke(bContext *C, wmOperator *op, const wmEvent *even
   sculpt_expand_ensure_sculptsession_data(ob);
 
   /* Initialize undo. */
-  SCULPT_undo_push_begin(ob, "expand");
+  SCULPT_undo_push_begin(ob, op);
   sculpt_expand_undo_push(ob, ss->expand_cache);
 
   /* Set the initial element for expand from the event position. */
@@ -2173,7 +2244,7 @@ void sculpt_expand_modal_keymap(wmKeyConfig *keyconf)
   static const char *name = "Sculpt Expand Modal";
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, name);
 
-  /* This function is called for each spacetype, only needs to add map once. */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
diff --git a/source/blender/editors/sculpt_paint/sculpt_face_set.c b/source/blender/editors/sculpt_paint/sculpt_face_set.cc
index ce704e619ea..485375a5cb1 100644
--- a/source/blender/editors/sculpt_paint/sculpt_face_set.c
+++ b/source/blender/editors/sculpt_paint/sculpt_face_set.cc
@@ -5,11 +5,18 @@
  * \ingroup edsculpt
  */
 
+#include <cmath>
+#include <cstdlib>
+#include <queue>
+
 #include "MEM_guardedalloc.h"
 
-#include "BLI_blenlib.h"
+#include "BLI_bit_vector.hh"
+#include "BLI_function_ref.hh"
 #include "BLI_hash.h"
 #include "BLI_math.h"
+#include "BLI_math_vector.hh"
+#include "BLI_span.hh"
 #include "BLI_task.h"
 
 #include "DNA_brush_types.h"
@@ -19,6 +26,7 @@
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 
+#include "BKE_attribute.hh"
 #include "BKE_brush.h"
 #include "BKE_ccg.h"
 #include "BKE_colortools.h"
@@ -53,21 +61,19 @@
 
 #include "bmesh.h"
 
-#include <math.h>
-#include <stdlib.h>
-
 /* Utils. */
 
 int ED_sculpt_face_sets_find_next_available_id(struct Mesh *mesh)
 {
-  const int *face_sets = CustomData_get_layer(&mesh->pdata, CD_SCULPT_FACE_SETS);
+  const int *face_sets = static_cast<const int *>(
+      CustomData_get_layer(&mesh->pdata, CD_SCULPT_FACE_SETS));
   if (!face_sets) {
     return SCULPT_FACE_SET_NONE;
   }
 
   int next_face_set_id = 0;
   for (int i = 0; i < mesh->totpoly; i++) {
-    next_face_set_id = max_ii(next_face_set_id, abs(face_sets[i]));
+    next_face_set_id = max_ii(next_face_set_id, face_sets[i]);
   }
   next_face_set_id++;
 
@@ -76,7 +82,7 @@ int ED_sculpt_face_sets_find_next_available_id(struct Mesh *mesh)
 
 void ED_sculpt_face_sets_initialize_none_to_id(struct Mesh *mesh, const int new_id)
 {
-  int *face_sets = CustomData_get_layer(&mesh->pdata, CD_SCULPT_FACE_SETS);
+  int *face_sets = static_cast<int *>(CustomData_get_layer(&mesh->pdata, CD_SCULPT_FACE_SETS));
   if (!face_sets) {
     return;
   }
@@ -109,7 +115,7 @@ static void do_draw_face_sets_brush_task_cb_ex(void *__restrict userdata,
                                                const int n,
                                                const TaskParallelTLS *__restrict tls)
 {
-  SculptThreadedTaskData *data = userdata;
+  SculptThreadedTaskData *data = static_cast<SculptThreadedTaskData *>(userdata);
   SculptSession *ss = data->ob->sculpt;
   const Brush *brush = data->brush;
   const float bstrength = ss->cache->bstrength;
@@ -135,6 +141,10 @@ static void do_draw_face_sets_brush_task_cb_ex(void *__restrict userdata,
         if (!sculpt_brush_test_sq_fn(&test, poly_center)) {
           continue;
         }
+        const bool face_hidden = ss->hide_poly && ss->hide_poly[vert_map->indices[j]];
+        if (face_hidden) {
+          continue;
+        }
         const float fade = bstrength * SCULPT_brush_strength_factor(ss,
                                                                     brush,
                                                                     vd.co,
@@ -142,11 +152,11 @@ static void do_draw_face_sets_brush_task_cb_ex(void *__restrict userdata,
                                                                     vd.no,
                                                                     vd.fno,
                                                                     vd.mask ? *vd.mask : 0.0f,
-                                                                    vd.index,
+                                                                    vd.vertex,
                                                                     thread_id);
 
-        if (fade > 0.05f && ss->face_sets[vert_map->indices[j]] > 0) {
-          ss->face_sets[vert_map->indices[j]] = abs(ss->cache->paint_face_set);
+        if (fade > 0.05f) {
+          ss->face_sets[vert_map->indices[j]] = ss->cache->paint_face_set;
         }
       }
     }
@@ -161,11 +171,11 @@ static void do_draw_face_sets_brush_task_cb_ex(void *__restrict userdata,
                                                                   vd.no,
                                                                   vd.fno,
                                                                   vd.mask ? *vd.mask : 0.0f,
-                                                                  vd.index,
+                                                                  vd.vertex,
                                                                   thread_id);
 
       if (fade > 0.05f) {
-        SCULPT_vertex_face_set_set(ss, vd.index, ss->cache->paint_face_set);
+        SCULPT_vertex_face_set_set(ss, vd.vertex, ss->cache->paint_face_set);
       }
     }
   }
@@ -176,7 +186,7 @@ static void do_relax_face_sets_brush_task_cb_ex(void *__restrict userdata,
                                                 const int n,
                                                 const TaskParallelTLS *__restrict tls)
 {
-  SculptThreadedTaskData *data = userdata;
+  SculptThreadedTaskData *data = static_cast<SculptThreadedTaskData *>(userdata);
   SculptSession *ss = data->ob->sculpt;
   const Brush *brush = data->brush;
   float bstrength = ss->cache->bstrength;
@@ -199,7 +209,7 @@ static void do_relax_face_sets_brush_task_cb_ex(void *__restrict userdata,
     if (!sculpt_brush_test_sq_fn(&test, vd.co)) {
       continue;
     }
-    if (relax_face_sets == SCULPT_vertex_has_unique_face_set(ss, vd.index)) {
+    if (relax_face_sets == SCULPT_vertex_has_unique_face_set(ss, vd.vertex)) {
       continue;
     }
 
@@ -210,12 +220,12 @@ static void do_relax_face_sets_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     SCULPT_relax_vertex(ss, &vd, fade * bstrength, relax_face_sets, vd.co);
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -229,12 +239,11 @@ void SCULPT_do_draw_face_sets_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, in
   BKE_curvemapping_init(brush->curve);
 
   /* Threaded loop over nodes. */
-  SculptThreadedTaskData data = {
-      .sd = sd,
-      .ob = ob,
-      .brush = brush,
-      .nodes = nodes,
-  };
+  SculptThreadedTaskData data{};
+  data.sd = sd;
+  data.ob = ob;
+  data.brush = brush;
+  data.nodes = nodes;
 
   TaskParallelSettings settings;
   BKE_pbvh_parallel_range_settings(&settings, true, totnode);
@@ -287,7 +296,7 @@ static EnumPropertyItem prop_sculpt_face_set_create_types[] = {
         "Face Set from Edit Mode Selection",
         "Create an Face Set corresponding to the Edit Mode face selection",
     },
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 static int sculpt_face_set_create_exec(bContext *C, wmOperator *op)
@@ -303,6 +312,9 @@ static int sculpt_face_set_create_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
+  ss->face_sets = BKE_sculpt_face_sets_ensure(mesh);
+
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, mode == SCULPT_FACE_SET_MASKED, false);
 
   const int tot_vert = SCULPT_vertex_count_get(ss);
@@ -311,21 +323,24 @@ static int sculpt_face_set_create_exec(bContext *C, wmOperator *op)
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode **nodes;
   int totnode;
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
 
   if (!nodes) {
     return OPERATOR_CANCELLED;
   }
 
-  SCULPT_undo_push_begin(ob, "face set change");
+  SCULPT_undo_push_begin(ob, op);
   SCULPT_undo_push_node(ob, nodes[0], SCULPT_UNDO_FACE_SETS);
 
   const int next_face_set = SCULPT_face_set_next_available_get(ss);
 
   if (mode == SCULPT_FACE_SET_MASKED) {
     for (int i = 0; i < tot_vert; i++) {
-      if (SCULPT_vertex_mask_get(ss, i) >= threshold && SCULPT_vertex_visible_get(ss, i)) {
-        SCULPT_vertex_face_set_set(ss, i, next_face_set);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      if (SCULPT_vertex_mask_get(ss, vertex) >= threshold &&
+          SCULPT_vertex_visible_get(ss, vertex)) {
+        SCULPT_vertex_face_set_set(ss, vertex, next_face_set);
       }
     }
   }
@@ -337,47 +352,48 @@ static int sculpt_face_set_create_exec(bContext *C, wmOperator *op)
      * sets and the performance hit of rendering the overlay. */
     bool all_visible = true;
     for (int i = 0; i < tot_vert; i++) {
-      if (!SCULPT_vertex_visible_get(ss, i)) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      if (!SCULPT_vertex_visible_get(ss, vertex)) {
         all_visible = false;
         break;
       }
     }
 
     if (all_visible) {
-      Mesh *mesh = ob->data;
       mesh->face_sets_color_default = next_face_set;
       BKE_pbvh_face_sets_color_set(
           ss->pbvh, mesh->face_sets_color_seed, mesh->face_sets_color_default);
     }
 
     for (int i = 0; i < tot_vert; i++) {
-      if (SCULPT_vertex_visible_get(ss, i)) {
-        SCULPT_vertex_face_set_set(ss, i, next_face_set);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      if (SCULPT_vertex_visible_get(ss, vertex)) {
+        SCULPT_vertex_face_set_set(ss, vertex, next_face_set);
       }
     }
   }
 
   if (mode == SCULPT_FACE_SET_ALL) {
     for (int i = 0; i < tot_vert; i++) {
-      SCULPT_vertex_face_set_set(ss, i, next_face_set);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      SCULPT_vertex_face_set_set(ss, vertex, next_face_set);
     }
   }
 
   if (mode == SCULPT_FACE_SET_SELECTION) {
-    Mesh *mesh = ob->data;
     BMesh *bm;
     const BMAllocTemplate allocsize = BMALLOC_TEMPLATE_FROM_ME(mesh);
-    bm = BM_mesh_create(&allocsize,
-                        &((struct BMeshCreateParams){
-                            .use_toolflags = true,
-                        }));
-
-    BM_mesh_bm_from_me(bm,
-                       mesh,
-                       (&(struct BMeshFromMeshParams){
-                           .calc_face_normal = true,
-                           .calc_vert_normal = true,
-                       }));
+    BMeshCreateParams create_params{};
+    create_params.use_toolflags = true;
+    bm = BM_mesh_create(&allocsize, &create_params);
+
+    BMeshFromMeshParams convert_params{};
+    convert_params.calc_vert_normal = true;
+    convert_params.calc_face_normal = true;
+    BM_mesh_bm_from_me(bm, mesh, &convert_params);
 
     BMIter iter;
     BMFace *f;
@@ -496,186 +512,103 @@ static EnumPropertyItem prop_sculpt_face_sets_init_types[] = {
         "Create a Face Set per isolated Face Set",
     },
 
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
-typedef bool (*face_sets_flood_fill_test)(
-    BMesh *bm, BMFace *from_f, BMEdge *from_e, BMFace *to_f, const float threshold);
+using FaceSetsFloodFillFn = blender::FunctionRef<bool(int from_face, int edge, int to_face)>;
 
-static bool sculpt_face_sets_init_loose_parts_test(BMesh *UNUSED(bm),
-                                                   BMFace *UNUSED(from_f),
-                                                   BMEdge *UNUSED(from_e),
-                                                   BMFace *UNUSED(to_f),
-                                                   const float UNUSED(threshold))
-{
-  return true;
-}
-
-static bool sculpt_face_sets_init_normals_test(
-    BMesh *UNUSED(bm), BMFace *from_f, BMEdge *UNUSED(from_e), BMFace *to_f, const float threshold)
-{
-  return fabsf(dot_v3v3(from_f->no, to_f->no)) > threshold;
-}
-
-static bool sculpt_face_sets_init_uv_seams_test(BMesh *UNUSED(bm),
-                                                BMFace *UNUSED(from_f),
-                                                BMEdge *from_e,
-                                                BMFace *UNUSED(to_f),
-                                                const float UNUSED(threshold))
-{
-  return !BM_elem_flag_test(from_e, BM_ELEM_SEAM);
-}
-
-static bool sculpt_face_sets_init_crease_test(
-    BMesh *bm, BMFace *UNUSED(from_f), BMEdge *from_e, BMFace *UNUSED(to_f), const float threshold)
-{
-  return BM_elem_float_data_get(&bm->edata, from_e, CD_CREASE) < threshold;
-}
-
-static bool sculpt_face_sets_init_bevel_weight_test(
-    BMesh *bm, BMFace *UNUSED(from_f), BMEdge *from_e, BMFace *UNUSED(to_f), const float threshold)
-{
-  return BM_elem_float_data_get(&bm->edata, from_e, CD_BWEIGHT) < threshold;
-}
-
-static bool sculpt_face_sets_init_sharp_edges_test(BMesh *UNUSED(bm),
-                                                   BMFace *UNUSED(from_f),
-                                                   BMEdge *from_e,
-                                                   BMFace *UNUSED(to_f),
-                                                   const float UNUSED(threshold))
-{
-  return BM_elem_flag_test(from_e, BM_ELEM_SMOOTH);
-}
-
-static bool sculpt_face_sets_init_face_set_boundary_test(
-    BMesh *bm, BMFace *from_f, BMEdge *UNUSED(from_e), BMFace *to_f, const float UNUSED(threshold))
-{
-  const int cd_face_sets_offset = CustomData_get_offset(&bm->pdata, CD_SCULPT_FACE_SETS);
-  return BM_ELEM_CD_GET_INT(from_f, cd_face_sets_offset) ==
-         BM_ELEM_CD_GET_INT(to_f, cd_face_sets_offset);
-}
-
-static void sculpt_face_sets_init_flood_fill(Object *ob,
-                                             face_sets_flood_fill_test test,
-                                             const float threshold)
+static void sculpt_face_sets_init_flood_fill(Object *ob, const FaceSetsFloodFillFn &test_fn)
 {
+  using namespace blender;
   SculptSession *ss = ob->sculpt;
-  Mesh *mesh = ob->data;
-  BMesh *bm;
-  const BMAllocTemplate allocsize = BMALLOC_TEMPLATE_FROM_ME(mesh);
-  bm = BM_mesh_create(&allocsize,
-                      &((struct BMeshCreateParams){
-                          .use_toolflags = true,
-                      }));
-
-  BM_mesh_bm_from_me(bm,
-                     mesh,
-                     (&(struct BMeshFromMeshParams){
-                         .calc_face_normal = true,
-                         .calc_vert_normal = true,
-                     }));
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
 
-  BLI_bitmap *visited_faces = BLI_BITMAP_NEW(mesh->totpoly, "visited faces");
-  const int totfaces = mesh->totpoly;
+  BitVector<> visited_faces(mesh->totpoly, false);
 
   int *face_sets = ss->face_sets;
 
-  BM_mesh_elem_table_init(bm, BM_FACE);
-  BM_mesh_elem_table_ensure(bm, BM_FACE);
+  const Span<MEdge> edges = mesh->edges();
+  const Span<MPoly> polys = mesh->polys();
+  const Span<MLoop> loops = mesh->loops();
+
+  if (!ss->epmap) {
+    BKE_mesh_edge_poly_map_create(&ss->epmap,
+                                  &ss->epmap_mem,
+                                  edges.data(),
+                                  edges.size(),
+                                  polys.data(),
+                                  polys.size(),
+                                  loops.data(),
+                                  loops.size());
+  }
 
   int next_face_set = 1;
 
-  for (int i = 0; i < totfaces; i++) {
-    if (BLI_BITMAP_TEST(visited_faces, i)) {
+  for (const int i : polys.index_range()) {
+    if (visited_faces[i]) {
       continue;
     }
-    GSQueue *queue;
-    queue = BLI_gsqueue_new(sizeof(int));
+    std::queue<int> queue;
 
     face_sets[i] = next_face_set;
-    BLI_BITMAP_ENABLE(visited_faces, i);
-    BLI_gsqueue_push(queue, &i);
-
-    while (!BLI_gsqueue_is_empty(queue)) {
-      int from_f;
-      BLI_gsqueue_pop(queue, &from_f);
-
-      BMFace *f, *f_neighbor;
-      BMEdge *ed;
-      BMIter iter_a, iter_b;
-
-      f = BM_face_at_index(bm, from_f);
-
-      BM_ITER_ELEM (ed, &iter_a, f, BM_EDGES_OF_FACE) {
-        BM_ITER_ELEM (f_neighbor, &iter_b, ed, BM_FACES_OF_EDGE) {
-          if (f_neighbor == f) {
+    visited_faces[i].set(true);
+    queue.push(i);
+
+    while (!queue.empty()) {
+      const int poly_i = queue.front();
+      const MPoly &poly = polys[poly_i];
+      queue.pop();
+
+      for (const MLoop &loop : loops.slice(poly.loopstart, poly.totloop)) {
+        const int edge_i = loop.e;
+        const Span<int> neighbor_polys(ss->epmap[edge_i].indices, ss->epmap[edge_i].count);
+        for (const int neighbor_i : neighbor_polys) {
+          if (neighbor_i == poly_i) {
             continue;
           }
-          int neighbor_face_index = BM_elem_index_get(f_neighbor);
-          if (BLI_BITMAP_TEST(visited_faces, neighbor_face_index)) {
+          if (visited_faces[neighbor_i]) {
             continue;
           }
-          if (!test(bm, f, ed, f_neighbor, threshold)) {
+          if (!test_fn(poly_i, edge_i, neighbor_i)) {
             continue;
           }
 
-          face_sets[neighbor_face_index] = next_face_set;
-          BLI_BITMAP_ENABLE(visited_faces, neighbor_face_index);
-          BLI_gsqueue_push(queue, &neighbor_face_index);
+          face_sets[neighbor_i] = next_face_set;
+          visited_faces[neighbor_i].set(true);
+          queue.push(neighbor_i);
         }
       }
     }
 
     next_face_set += 1;
-
-    BLI_gsqueue_free(queue);
   }
-
-  MEM_SAFE_FREE(visited_faces);
-
-  BM_mesh_free(bm);
 }
 
 static void sculpt_face_sets_init_loop(Object *ob, const int mode)
 {
-  Mesh *mesh = ob->data;
+  using namespace blender;
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
   SculptSession *ss = ob->sculpt;
-  BMesh *bm;
-  const BMAllocTemplate allocsize = BMALLOC_TEMPLATE_FROM_ME(mesh);
-  bm = BM_mesh_create(&allocsize,
-                      &((struct BMeshCreateParams){
-                          .use_toolflags = true,
-                      }));
-
-  BM_mesh_bm_from_me(bm,
-                     mesh,
-                     (&(struct BMeshFromMeshParams){
-                         .calc_face_normal = true,
-                         .calc_vert_normal = true,
-                     }));
-  BMIter iter;
-  BMFace *f;
-
-  const int cd_fmaps_offset = CustomData_get_offset(&bm->pdata, CD_FACEMAP);
 
-  BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) {
-    if (mode == SCULPT_FACE_SETS_FROM_MATERIALS) {
-      ss->face_sets[BM_elem_index_get(f)] = (int)(f->mat_nr + 1);
+  if (mode == SCULPT_FACE_SETS_FROM_MATERIALS) {
+    const bke::AttributeAccessor attributes = mesh->attributes();
+    const VArraySpan<int> material_indices = attributes.lookup_or_default<int>(
+        "material_index", ATTR_DOMAIN_FACE, 0);
+    for (const int i : IndexRange(mesh->totpoly)) {
+      ss->face_sets[i] = material_indices[i] + 1;
     }
-    else if (mode == SCULPT_FACE_SETS_FROM_FACE_MAPS) {
-      if (cd_fmaps_offset != -1) {
-        ss->face_sets[BM_elem_index_get(f)] = BM_ELEM_CD_GET_INT(f, cd_fmaps_offset) + 2;
-      }
-      else {
-        ss->face_sets[BM_elem_index_get(f)] = 1;
-      }
+  }
+  else if (mode == SCULPT_FACE_SETS_FROM_FACE_MAPS) {
+    const int *face_maps = static_cast<int *>(CustomData_get_layer(&mesh->pdata, CD_FACEMAP));
+    for (const int i : IndexRange(mesh->totpoly)) {
+      ss->face_sets[i] = face_maps ? face_maps[i] : 1;
     }
   }
-  BM_mesh_free(bm);
 }
 
 static int sculpt_face_set_init_exec(bContext *C, wmOperator *op)
 {
+  using namespace blender;
   Object *ob = CTX_data_active_object(C);
   SculptSession *ss = ob->sculpt;
   Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
@@ -692,52 +625,95 @@ static int sculpt_face_set_init_exec(bContext *C, wmOperator *op)
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode **nodes;
   int totnode;
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
 
   if (!nodes) {
     return OPERATOR_CANCELLED;
   }
 
-  SCULPT_undo_push_begin(ob, "face set change");
+  SCULPT_undo_push_begin(ob, op);
   SCULPT_undo_push_node(ob, nodes[0], SCULPT_UNDO_FACE_SETS);
 
   const float threshold = RNA_float_get(op->ptr, "threshold");
 
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
+  ss->face_sets = BKE_sculpt_face_sets_ensure(mesh);
+  const bke::AttributeAccessor attributes = mesh->attributes();
+
   switch (mode) {
-    case SCULPT_FACE_SETS_FROM_LOOSE_PARTS:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_loose_parts_test, threshold);
+    case SCULPT_FACE_SETS_FROM_LOOSE_PARTS: {
+      const VArray<bool> hide_poly = attributes.lookup_or_default<bool>(
+          ".hide_poly", ATTR_DOMAIN_FACE, false);
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int from_face, const int /*edge*/, const int to_face) {
+            return hide_poly[from_face] == hide_poly[to_face];
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_MATERIALS:
+    }
+    case SCULPT_FACE_SETS_FROM_MATERIALS: {
       sculpt_face_sets_init_loop(ob, SCULPT_FACE_SETS_FROM_MATERIALS);
       break;
-    case SCULPT_FACE_SETS_FROM_NORMALS:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_normals_test, threshold);
+    }
+    case SCULPT_FACE_SETS_FROM_NORMALS: {
+      const Span<float3> poly_normals(
+          reinterpret_cast<const float3 *>(BKE_mesh_poly_normals_ensure(mesh)), mesh->totpoly);
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int from_face, const int /*edge*/, const int to_face) -> bool {
+            return std::abs(math::dot(poly_normals[from_face], poly_normals[to_face])) > threshold;
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_UV_SEAMS:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_uv_seams_test, threshold);
+    }
+    case SCULPT_FACE_SETS_FROM_UV_SEAMS: {
+      const Span<MEdge> edges = mesh->edges();
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int /*from_face*/, const int edge, const int /*to_face*/) -> bool {
+            return (edges[edge].flag & ME_SEAM) == 0;
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_CREASES:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_crease_test, threshold);
+    }
+    case SCULPT_FACE_SETS_FROM_CREASES: {
+      const Span<MEdge> edges = mesh->edges();
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int /*from_face*/, const int edge, const int /*to_face*/) -> bool {
+            return edges[edge].crease / 255.0f < threshold;
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_SHARP_EDGES:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_sharp_edges_test, threshold);
+    }
+    case SCULPT_FACE_SETS_FROM_SHARP_EDGES: {
+      const Span<MEdge> edges = mesh->edges();
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int /*from_face*/, const int edge, const int /*to_face*/) -> bool {
+            return (edges[edge].flag & ME_SHARP) == 0;
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_BEVEL_WEIGHT:
-      sculpt_face_sets_init_flood_fill(ob, sculpt_face_sets_init_bevel_weight_test, threshold);
+    }
+    case SCULPT_FACE_SETS_FROM_BEVEL_WEIGHT: {
+      const float *bevel_weights = static_cast<const float *>(
+          CustomData_get_layer(&mesh->edata, CD_BWEIGHT));
+      sculpt_face_sets_init_flood_fill(
+          ob, [&](const int /*from_face*/, const int edge, const int /*to_face*/) -> bool {
+            return bevel_weights ? bevel_weights[edge] / 255.0f < threshold : true;
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_FACE_SET_BOUNDARIES:
+    }
+    case SCULPT_FACE_SETS_FROM_FACE_SET_BOUNDARIES: {
+      Array<int> face_sets_copy(Span<int>(ss->face_sets, mesh->totpoly));
       sculpt_face_sets_init_flood_fill(
-          ob, sculpt_face_sets_init_face_set_boundary_test, threshold);
+          ob, [&](const int from_face, const int /*edge*/, const int to_face) -> bool {
+            return face_sets_copy[from_face] == face_sets_copy[to_face];
+          });
       break;
-    case SCULPT_FACE_SETS_FROM_FACE_MAPS:
+    }
+    case SCULPT_FACE_SETS_FROM_FACE_MAPS: {
       sculpt_face_sets_init_loop(ob, SCULPT_FACE_SETS_FROM_FACE_MAPS);
       break;
+    }
   }
 
   SCULPT_undo_push_end(ob);
 
   /* Sync face sets visibility and vertex visibility as now all Face Sets are visible. */
-  SCULPT_visibility_sync_all_face_sets_to_vertices(ob);
+  SCULPT_visibility_sync_all_from_faces(ob);
 
   for (int i = 0; i < totnode; i++) {
     BKE_pbvh_node_mark_update_visibility(nodes[i]);
@@ -748,7 +724,7 @@ static int sculpt_face_set_init_exec(bContext *C, wmOperator *op)
   MEM_SAFE_FREE(nodes);
 
   if (BKE_pbvh_type(pbvh) == PBVH_FACES) {
-    BKE_mesh_flush_hidden_from_verts(ob->data);
+    BKE_mesh_flush_hidden_from_verts(mesh);
   }
 
   SCULPT_tag_update_overlays(C);
@@ -827,7 +803,7 @@ static EnumPropertyItem prop_sculpt_face_sets_change_visibility_types[] = {
         "Show All Face Sets",
         "Show All Face Sets",
     },
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 static int sculpt_face_sets_change_visibility_exec(bContext *C, wmOperator *op)
@@ -841,19 +817,25 @@ static int sculpt_face_sets_change_visibility_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
+  if (!ss->face_sets) {
+    return OPERATOR_CANCELLED;
+  }
+
+  Mesh *mesh = BKE_object_get_original_mesh(ob);
+
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, true, false);
 
   const int tot_vert = SCULPT_vertex_count_get(ss);
   const int mode = RNA_enum_get(op->ptr, "mode");
   const int active_face_set = SCULPT_active_face_set_get(ss);
 
-  SCULPT_undo_push_begin(ob, "Hide area");
+  SCULPT_undo_push_begin(ob, op);
 
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode **nodes;
   int totnode;
 
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
 
   if (totnode == 0) {
     MEM_SAFE_FREE(nodes);
@@ -869,44 +851,58 @@ static int sculpt_face_sets_change_visibility_exec(bContext *C, wmOperator *op)
      * be synced from face sets to non-manifold vertices. */
     if (BKE_pbvh_type(ss->pbvh) == PBVH_GRIDS) {
       for (int i = 0; i < tot_vert; i++) {
-        if (!SCULPT_vertex_visible_get(ss, i)) {
+        PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+        if (!SCULPT_vertex_visible_get(ss, vertex)) {
           hidden_vertex = true;
           break;
         }
       }
     }
 
-    for (int i = 0; i < ss->totfaces; i++) {
-      if (ss->face_sets[i] <= 0) {
-        hidden_vertex = true;
-        break;
+    if (ss->hide_poly) {
+      for (int i = 0; i < ss->totfaces; i++) {
+        if (ss->hide_poly[i]) {
+          hidden_vertex = true;
+          break;
+        }
       }
     }
 
+    ss->hide_poly = BKE_sculpt_hide_poly_ensure(mesh);
+
     if (hidden_vertex) {
-      SCULPT_face_sets_visibility_all_set(ss, true);
+      SCULPT_face_visibility_all_set(ss, true);
     }
     else {
-      SCULPT_face_sets_visibility_all_set(ss, false);
+      SCULPT_face_visibility_all_set(ss, false);
       SCULPT_face_set_visibility_set(ss, active_face_set, true);
     }
   }
 
   if (mode == SCULPT_FACE_SET_VISIBILITY_SHOW_ALL) {
-    SCULPT_face_sets_visibility_all_set(ss, true);
+    /* As an optimization, free the hide attribute when making all geometry visible. This allows
+     * reduced memory usage without manually clearing it later, and allows sculpt operations to
+     * avoid checking element's hide status. */
+    CustomData_free_layer_named(&mesh->pdata, ".hide_poly", mesh->totpoly);
+    ss->hide_poly = nullptr;
+    BKE_pbvh_update_hide_attributes_from_mesh(pbvh);
   }
 
   if (mode == SCULPT_FACE_SET_VISIBILITY_SHOW_ACTIVE) {
-    SCULPT_face_sets_visibility_all_set(ss, false);
+    ss->hide_poly = BKE_sculpt_hide_poly_ensure(mesh);
+    SCULPT_face_visibility_all_set(ss, false);
     SCULPT_face_set_visibility_set(ss, active_face_set, true);
   }
 
   if (mode == SCULPT_FACE_SET_VISIBILITY_HIDE_ACTIVE) {
+    ss->hide_poly = BKE_sculpt_hide_poly_ensure(mesh);
     SCULPT_face_set_visibility_set(ss, active_face_set, false);
   }
 
   if (mode == SCULPT_FACE_SET_VISIBILITY_INVERT) {
-    SCULPT_face_sets_visibility_invert(ss);
+    ss->hide_poly = BKE_sculpt_hide_poly_ensure(mesh);
+    SCULPT_face_visibility_all_invert(ss);
   }
 
   /* For modes that use the cursor active vertex, update the rotation origin for viewport
@@ -922,7 +918,7 @@ static int sculpt_face_sets_change_visibility_exec(bContext *C, wmOperator *op)
   }
 
   /* Sync face sets visibility and vertex visibility. */
-  SCULPT_visibility_sync_all_face_sets_to_vertices(ob);
+  SCULPT_visibility_sync_all_from_faces(ob);
 
   SCULPT_undo_push_end(ob);
 
@@ -949,7 +945,7 @@ static int sculpt_face_sets_change_visibility_invoke(bContext *C,
   /* Update the active vertex and Face Set using the cursor position to avoid relying on the paint
    * cursor updates. */
   SculptCursorGeometryInfo sgi;
-  const float mval_fl[2] = {UNPACK2(event->mval)};
+  const float mval_fl[2] = {(float)event->mval[0], (float)event->mval[1]};
   SCULPT_vertex_random_access_ensure(ss);
   SCULPT_cursor_geometry_info_update(C, &sgi, mval_fl, false);
 
@@ -989,10 +985,14 @@ static int sculpt_face_sets_randomize_colors_exec(bContext *C, wmOperator *UNUSE
     return OPERATOR_CANCELLED;
   }
 
+  if (!ss->face_sets) {
+    return OPERATOR_CANCELLED;
+  }
+
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode **nodes;
   int totnode;
-  Mesh *mesh = ob->data;
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
 
   mesh->face_sets_color_seed += 1;
   if (ss->face_sets) {
@@ -1003,7 +1003,7 @@ static int sculpt_face_sets_randomize_colors_exec(bContext *C, wmOperator *UNUSE
   }
   BKE_pbvh_face_sets_color_set(pbvh, mesh->face_sets_color_seed, mesh->face_sets_color_default);
 
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
   for (int i = 0; i < totnode; i++) {
     BKE_pbvh_node_mark_redraw(nodes[i]);
   }
@@ -1075,7 +1075,7 @@ static EnumPropertyItem prop_sculpt_face_sets_edit_types[] = {
         "Creates a smooth as possible geometry patch from the Face Set minimizing changes in "
         "vertex tangents",
     },
-    {0, NULL, 0, NULL, NULL},
+    {0, nullptr, 0, nullptr, nullptr},
 };
 
 static void sculpt_face_set_grow(Object *ob,
@@ -1085,13 +1085,16 @@ static void sculpt_face_set_grow(Object *ob,
                                  const bool modify_hidden)
 {
   Mesh *mesh = BKE_mesh_from_object(ob);
+  const MPoly *polys = BKE_mesh_polys(mesh);
+  const MLoop *loops = BKE_mesh_loops(mesh);
+
   for (int p = 0; p < mesh->totpoly; p++) {
     if (!modify_hidden && prev_face_sets[p] <= 0) {
       continue;
     }
-    const MPoly *c_poly = &mesh->mpoly[p];
+    const MPoly *c_poly = &polys[p];
     for (int l = 0; l < c_poly->totloop; l++) {
-      const MLoop *c_loop = &mesh->mloop[c_poly->loopstart + l];
+      const MLoop *c_loop = &loops[c_poly->loopstart + l];
       const MeshElemMap *vert_map = &ss->pmap[c_loop->v];
       for (int i = 0; i < vert_map->count; i++) {
         const int neighbor_face_index = vert_map->indices[i];
@@ -1113,14 +1116,16 @@ static void sculpt_face_set_shrink(Object *ob,
                                    const bool modify_hidden)
 {
   Mesh *mesh = BKE_mesh_from_object(ob);
+  const MPoly *polys = BKE_mesh_polys(mesh);
+  const MLoop *loops = BKE_mesh_loops(mesh);
   for (int p = 0; p < mesh->totpoly; p++) {
     if (!modify_hidden && prev_face_sets[p] <= 0) {
       continue;
     }
     if (abs(prev_face_sets[p]) == active_face_set_id) {
-      const MPoly *c_poly = &mesh->mpoly[p];
+      const MPoly *c_poly = &polys[p];
       for (int l = 0; l < c_poly->totloop; l++) {
-        const MLoop *c_loop = &mesh->mloop[c_poly->loopstart + l];
+        const MLoop *c_loop = &loops[c_poly->loopstart + l];
         const MeshElemMap *vert_map = &ss->pmap[c_loop->v];
         for (int i = 0; i < vert_map->count; i++) {
           const int neighbor_face_index = vert_map->indices[i];
@@ -1138,18 +1143,21 @@ static void sculpt_face_set_shrink(Object *ob,
 
 static bool check_single_face_set(SculptSession *ss, int *face_sets, const bool check_visible_only)
 {
-
+  if (face_sets == nullptr) {
+    return true;
+  }
   int first_face_set = SCULPT_FACE_SET_NONE;
   if (check_visible_only) {
     for (int f = 0; f < ss->totfaces; f++) {
-      if (face_sets[f] > 0) {
-        first_face_set = face_sets[f];
-        break;
+      if (ss->hide_poly && ss->hide_poly[f]) {
+        continue;
       }
+      first_face_set = face_sets[f];
+      break;
     }
   }
   else {
-    first_face_set = abs(face_sets[0]);
+    first_face_set = face_sets[0];
   }
 
   if (first_face_set == SCULPT_FACE_SET_NONE) {
@@ -1157,8 +1165,10 @@ static bool check_single_face_set(SculptSession *ss, int *face_sets, const bool
   }
 
   for (int f = 0; f < ss->totfaces; f++) {
-    const int face_set_id = check_visible_only ? face_sets[f] : abs(face_sets[f]);
-    if (face_set_id != first_face_set) {
+    if (check_visible_only && ss->hide_poly && ss->hide_poly[f]) {
+      continue;
+    }
+    if (face_sets[f] != first_face_set) {
       return false;
     }
   }
@@ -1171,19 +1181,16 @@ static void sculpt_face_set_delete_geometry(Object *ob,
                                             const bool modify_hidden)
 {
 
-  Mesh *mesh = ob->data;
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
   const BMAllocTemplate allocsize = BMALLOC_TEMPLATE_FROM_ME(mesh);
-  BMesh *bm = BM_mesh_create(&allocsize,
-                             &((struct BMeshCreateParams){
-                                 .use_toolflags = true,
-                             }));
-
-  BM_mesh_bm_from_me(bm,
-                     mesh,
-                     (&(struct BMeshFromMeshParams){
-                         .calc_face_normal = true,
-                         .calc_vert_normal = true,
-                     }));
+  BMeshCreateParams create_params{};
+  create_params.use_toolflags = true;
+  BMesh *bm = BM_mesh_create(&allocsize, &create_params);
+
+  BMeshFromMeshParams convert_params{};
+  convert_params.calc_vert_normal = true;
+  convert_params.calc_face_normal = true;
+  BM_mesh_bm_from_me(bm, mesh, &convert_params);
 
   BM_mesh_elem_table_init(bm, BM_FACE);
   BM_mesh_elem_table_ensure(bm, BM_FACE);
@@ -1192,44 +1199,45 @@ static void sculpt_face_set_delete_geometry(Object *ob,
   BMFace *f;
   BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) {
     const int face_index = BM_elem_index_get(f);
-    const int face_set_id = modify_hidden ? abs(ss->face_sets[face_index]) :
-                                            ss->face_sets[face_index];
-    BM_elem_flag_set(f, BM_ELEM_TAG, face_set_id == active_face_set_id);
+    if (!modify_hidden && ss->hide_poly && ss->hide_poly[face_index]) {
+      continue;
+    }
+    BM_elem_flag_set(f, BM_ELEM_TAG, ss->face_sets[face_index] == active_face_set_id);
   }
   BM_mesh_delete_hflag_context(bm, BM_ELEM_TAG, DEL_FACES);
   BM_mesh_elem_hflag_disable_all(bm, BM_VERT | BM_EDGE | BM_FACE, BM_ELEM_TAG, false);
 
-  BM_mesh_bm_to_me(NULL,
-                   bm,
-                   ob->data,
-                   (&(struct BMeshToMeshParams){
-                       .calc_object_remap = false,
-                   }));
+  BMeshToMeshParams bmesh_to_mesh_params{};
+  bmesh_to_mesh_params.calc_object_remap = false;
+  BM_mesh_bm_to_me(nullptr, bm, mesh, &bmesh_to_mesh_params);
 
   BM_mesh_free(bm);
 }
 
 static void sculpt_face_set_edit_fair_face_set(Object *ob,
                                                const int active_face_set_id,
-                                               const int fair_order)
+                                               const eMeshFairingDepth fair_order)
 {
   SculptSession *ss = ob->sculpt;
   const int totvert = SCULPT_vertex_count_get(ss);
 
-  Mesh *mesh = ob->data;
-  bool *fair_vertices = MEM_malloc_arrayN(totvert, sizeof(bool), "fair vertices");
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
+  bool *fair_verts = static_cast<bool *>(
+      MEM_malloc_arrayN(totvert, sizeof(bool), "fair vertices"));
 
   SCULPT_boundary_info_ensure(ob);
 
   for (int i = 0; i < totvert; i++) {
-    fair_vertices[i] = !SCULPT_vertex_is_boundary(ss, i) &&
-                       SCULPT_vertex_has_face_set(ss, i, active_face_set_id) &&
-                       SCULPT_vertex_has_unique_face_set(ss, i);
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    fair_verts[i] = !SCULPT_vertex_is_boundary(ss, vertex) &&
+                    SCULPT_vertex_has_face_set(ss, vertex, active_face_set_id) &&
+                    SCULPT_vertex_has_unique_face_set(ss, vertex);
   }
 
   MVert *mvert = SCULPT_mesh_deformed_mverts_get(ss);
-  BKE_mesh_prefair_and_fair_vertices(mesh, mvert, fair_vertices, fair_order);
-  MEM_freeN(fair_vertices);
+  BKE_mesh_prefair_and_fair_verts(mesh, mvert, fair_verts, fair_order);
+  MEM_freeN(fair_verts);
 }
 
 static void sculpt_face_set_apply_edit(Object *ob,
@@ -1241,13 +1249,13 @@ static void sculpt_face_set_apply_edit(Object *ob,
 
   switch (mode) {
     case SCULPT_FACE_SET_EDIT_GROW: {
-      int *prev_face_sets = MEM_dupallocN(ss->face_sets);
+      int *prev_face_sets = static_cast<int *>(MEM_dupallocN(ss->face_sets));
       sculpt_face_set_grow(ob, ss, prev_face_sets, active_face_set_id, modify_hidden);
       MEM_SAFE_FREE(prev_face_sets);
       break;
     }
     case SCULPT_FACE_SET_EDIT_SHRINK: {
-      int *prev_face_sets = MEM_dupallocN(ss->face_sets);
+      int *prev_face_sets = static_cast<int *>(MEM_dupallocN(ss->face_sets));
       sculpt_face_set_shrink(ob, ss, prev_face_sets, active_face_set_id, modify_hidden);
       MEM_SAFE_FREE(prev_face_sets);
       break;
@@ -1304,23 +1312,26 @@ static void sculpt_face_set_edit_modify_geometry(bContext *C,
                                                  Object *ob,
                                                  const int active_face_set,
                                                  const eSculptFaceSetEditMode mode,
-                                                 const bool modify_hidden)
+                                                 const bool modify_hidden,
+                                                 wmOperator *op)
 {
-  ED_sculpt_undo_geometry_begin(ob, "edit face set delete geometry");
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
+  ED_sculpt_undo_geometry_begin(ob, op);
   sculpt_face_set_apply_edit(ob, abs(active_face_set), mode, modify_hidden);
   ED_sculpt_undo_geometry_end(ob);
-  BKE_mesh_batch_cache_dirty_tag(ob->data, BKE_MESH_BATCH_DIRTY_ALL);
+  BKE_mesh_batch_cache_dirty_tag(mesh, BKE_MESH_BATCH_DIRTY_ALL);
   DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
-  WM_event_add_notifier(C, NC_GEOM | ND_DATA, ob->data);
+  WM_event_add_notifier(C, NC_GEOM | ND_DATA, mesh);
 }
 
 static void face_set_edit_do_post_visibility_updates(Object *ob, PBVHNode **nodes, int totnode)
 {
   SculptSession *ss = ob->sculpt;
   PBVH *pbvh = ss->pbvh;
+  Mesh *mesh = static_cast<Mesh *>(ob->data);
 
   /* Sync face sets visibility and vertex visibility as now all Face Sets are visible. */
-  SCULPT_visibility_sync_all_face_sets_to_vertices(ob);
+  SCULPT_visibility_sync_all_from_faces(ob);
 
   for (int i = 0; i < totnode; i++) {
     BKE_pbvh_node_mark_update_visibility(nodes[i]);
@@ -1329,24 +1340,25 @@ static void face_set_edit_do_post_visibility_updates(Object *ob, PBVHNode **node
   BKE_pbvh_update_vertex_data(ss->pbvh, PBVH_UpdateVisibility);
 
   if (BKE_pbvh_type(pbvh) == PBVH_FACES) {
-    BKE_mesh_flush_hidden_from_verts(ob->data);
+    BKE_mesh_flush_hidden_from_verts(mesh);
   }
 }
 
 static void sculpt_face_set_edit_modify_face_sets(Object *ob,
                                                   const int active_face_set,
                                                   const eSculptFaceSetEditMode mode,
-                                                  const bool modify_hidden)
+                                                  const bool modify_hidden,
+                                                  wmOperator *op)
 {
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode **nodes;
   int totnode;
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
 
   if (!nodes) {
     return;
   }
-  SCULPT_undo_push_begin(ob, "face set edit");
+  SCULPT_undo_push_begin(ob, op);
   SCULPT_undo_push_node(ob, nodes[0], SCULPT_UNDO_FACE_SETS);
   sculpt_face_set_apply_edit(ob, abs(active_face_set), mode, modify_hidden);
   SCULPT_undo_push_end(ob);
@@ -1357,15 +1369,16 @@ static void sculpt_face_set_edit_modify_face_sets(Object *ob,
 static void sculpt_face_set_edit_modify_coordinates(bContext *C,
                                                     Object *ob,
                                                     const int active_face_set,
-                                                    const eSculptFaceSetEditMode mode)
+                                                    const eSculptFaceSetEditMode mode,
+                                                    wmOperator *op)
 {
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   SculptSession *ss = ob->sculpt;
   PBVH *pbvh = ss->pbvh;
   PBVHNode **nodes;
   int totnode;
-  BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
-  SCULPT_undo_push_begin(ob, "face set edit");
+  BKE_pbvh_search_gather(pbvh, nullptr, nullptr, &nodes, &totnode);
+  SCULPT_undo_push_begin(ob, op);
   for (int i = 0; i < totnode; i++) {
     BKE_pbvh_node_mark_update(nodes[i]);
     SCULPT_undo_push_node(ob, nodes[i], SCULPT_UNDO_COORDS);
@@ -1387,19 +1400,21 @@ static int sculpt_face_set_edit_invoke(bContext *C, wmOperator *op, const wmEven
   SculptSession *ss = ob->sculpt;
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
 
-  const int mode = RNA_enum_get(op->ptr, "mode");
+  const eSculptFaceSetEditMode mode = static_cast<eSculptFaceSetEditMode>(
+      RNA_enum_get(op->ptr, "mode"));
   const bool modify_hidden = RNA_boolean_get(op->ptr, "modify_hidden");
 
   if (!sculpt_face_set_edit_is_operation_valid(ss, mode, modify_hidden)) {
     return OPERATOR_CANCELLED;
   }
 
+  ss->face_sets = BKE_sculpt_face_sets_ensure(BKE_mesh_from_object(ob));
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, false, false);
 
   /* Update the current active Face Set and Vertex as the operator can be used directly from the
    * tool without brush cursor. */
   SculptCursorGeometryInfo sgi;
-  const float mval_fl[2] = {UNPACK2(event->mval)};
+  const float mval_fl[2] = {(float)event->mval[0], (float)event->mval[1]};
   if (!SCULPT_cursor_geometry_info_update(C, &sgi, mval_fl, false)) {
     /* The cursor is not over the mesh. Cancel to avoid editing the last updated Face Set ID. */
     return OPERATOR_CANCELLED;
@@ -1408,15 +1423,15 @@ static int sculpt_face_set_edit_invoke(bContext *C, wmOperator *op, const wmEven
 
   switch (mode) {
     case SCULPT_FACE_SET_EDIT_DELETE_GEOMETRY:
-      sculpt_face_set_edit_modify_geometry(C, ob, active_face_set, mode, modify_hidden);
+      sculpt_face_set_edit_modify_geometry(C, ob, active_face_set, mode, modify_hidden, op);
       break;
     case SCULPT_FACE_SET_EDIT_GROW:
     case SCULPT_FACE_SET_EDIT_SHRINK:
-      sculpt_face_set_edit_modify_face_sets(ob, active_face_set, mode, modify_hidden);
+      sculpt_face_set_edit_modify_face_sets(ob, active_face_set, mode, modify_hidden, op);
       break;
     case SCULPT_FACE_SET_EDIT_FAIR_POSITIONS:
     case SCULPT_FACE_SET_EDIT_FAIR_TANGENCY:
-      sculpt_face_set_edit_modify_coordinates(C, ob, active_face_set, mode);
+      sculpt_face_set_edit_modify_coordinates(C, ob, active_face_set, mode, op);
       break;
   }
 
diff --git a/source/blender/editors/sculpt_paint/sculpt_filter_color.c b/source/blender/editors/sculpt_paint/sculpt_filter_color.c
index a5d9f5306e2..161fc563950 100644
--- a/source/blender/editors/sculpt_paint/sculpt_filter_color.c
+++ b/source/blender/editors/sculpt_paint/sculpt_filter_color.c
@@ -93,7 +93,7 @@ static void color_filter_task_cb(void *__restrict userdata,
   const int mode = data->filter_type;
 
   SculptOrigVertData orig_data;
-  SCULPT_orig_vert_data_init(&orig_data, data->ob, data->nodes[n], SCULPT_UNDO_COORDS);
+  SCULPT_orig_vert_data_init(&orig_data, data->ob, data->nodes[n], SCULPT_UNDO_COLOR);
 
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
@@ -104,7 +104,7 @@ static void color_filter_task_cb(void *__restrict userdata,
     float fade = vd.mask ? *vd.mask : 0.0f;
     fade = 1.0f - fade;
     fade *= data->filter_strength;
-    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.index);
+    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.vertex);
     if (fade == 0.0f) {
       continue;
     }
@@ -189,10 +189,10 @@ static void color_filter_task_cb(void *__restrict userdata,
       case COLOR_FILTER_SMOOTH: {
         fade = clamp_f(fade, -1.0f, 1.0f);
         float smooth_color[4];
-        SCULPT_neighbor_color_average(ss, smooth_color, vd.index);
+        SCULPT_neighbor_color_average(ss, smooth_color, vd.vertex);
 
         float col[4];
-        SCULPT_vertex_color_get(ss, vd.index, col);
+        SCULPT_vertex_color_get(ss, vd.vertex, col);
 
         if (fade < 0.0f) {
           interp_v4_v4v4(smooth_color, smooth_color, col, 0.5f);
@@ -224,11 +224,7 @@ static void color_filter_task_cb(void *__restrict userdata,
       }
     }
 
-    SCULPT_vertex_color_set(ss, vd.index, final_color);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
+    SCULPT_vertex_color_set(ss, vd.vertex, final_color);
   }
   BKE_pbvh_vertex_iter_end;
   BKE_pbvh_node_mark_update_color(data->nodes[n]);
@@ -244,7 +240,8 @@ static void sculpt_color_presmooth_init(SculptSession *ss)
   }
 
   for (int i = 0; i < totvert; i++) {
-    SCULPT_vertex_color_get(ss, i, ss->filter_cache->pre_smoothed_color[i]);
+    SCULPT_vertex_color_get(
+        ss, BKE_pbvh_index_to_vertex(ss->pbvh, i), ss->filter_cache->pre_smoothed_color[i]);
   }
 
   for (int iteration = 0; iteration < 2; iteration++) {
@@ -253,7 +250,7 @@ static void sculpt_color_presmooth_init(SculptSession *ss)
       int total = 0;
 
       SculptVertexNeighborIter ni;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, BKE_pbvh_index_to_vertex(ss->pbvh, i), ni) {
         float col[4] = {0};
 
         copy_v4_v4(col, ss->filter_cache->pre_smoothed_color[ni.index]);
@@ -349,7 +346,7 @@ static int sculpt_color_filter_invoke(bContext *C, wmOperator *op, const wmEvent
     return OPERATOR_CANCELLED;
   }
 
-  SCULPT_undo_push_begin(ob, "color filter");
+  SCULPT_undo_push_begin(ob, op);
   BKE_sculpt_color_layer_create_if_needed(ob);
 
   /* CTX_data_ensure_evaluated_depsgraph should be used at the end to include the updates of
diff --git a/source/blender/editors/sculpt_paint/sculpt_filter_mask.c b/source/blender/editors/sculpt_paint/sculpt_filter_mask.c
index ea3f56d0859..bb27e4f1e9e 100644
--- a/source/blender/editors/sculpt_paint/sculpt_filter_mask.c
+++ b/source/blender/editors/sculpt_paint/sculpt_filter_mask.c
@@ -14,6 +14,7 @@
 
 #include "DNA_mesh_types.h"
 #include "DNA_meshdata_types.h"
+#include "DNA_modifier_types.h"
 
 #include "BKE_brush.h"
 #include "BKE_context.h"
@@ -103,7 +104,7 @@ static void mask_filter_task_cb(void *__restrict userdata,
     switch (mode) {
       case MASK_FILTER_SMOOTH:
       case MASK_FILTER_SHARPEN: {
-        float val = SCULPT_neighbor_mask_average(ss, vd.index);
+        float val = SCULPT_neighbor_mask_average(ss, vd.vertex);
 
         val -= *vd.mask;
 
@@ -123,7 +124,7 @@ static void mask_filter_task_cb(void *__restrict userdata,
       }
       case MASK_FILTER_GROW:
         max = 0.0f;
-        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
           float vmask_f = data->prev_mask[ni.index];
           if (vmask_f > max) {
             max = vmask_f;
@@ -134,7 +135,7 @@ static void mask_filter_task_cb(void *__restrict userdata,
         break;
       case MASK_FILTER_SHRINK:
         min = 1.0f;
-        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
           float vmask_f = data->prev_mask[ni.index];
           if (vmask_f < min) {
             min = vmask_f;
@@ -162,9 +163,6 @@ static void mask_filter_task_cb(void *__restrict userdata,
     if (*vd.mask != prev_val) {
       update = true;
     }
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
 
@@ -177,11 +175,15 @@ static int sculpt_mask_filter_exec(bContext *C, wmOperator *op)
 {
   Object *ob = CTX_data_active_object(C);
   Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
+  const Scene *scene = CTX_data_scene(C);
   PBVHNode **nodes;
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   int totnode;
   int filter_type = RNA_enum_get(op->ptr, "filter_type");
 
+  MultiresModifierData *mmd = BKE_sculpt_multires_active(scene, ob);
+  BKE_sculpt_mask_layers_ensure(ob, mmd);
+
   BKE_sculpt_update_object_for_edit(depsgraph, ob, true, true, false);
 
   SculptSession *ss = ob->sculpt;
@@ -196,7 +198,7 @@ static int sculpt_mask_filter_exec(bContext *C, wmOperator *op)
   int num_verts = SCULPT_vertex_count_get(ss);
 
   BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
-  SCULPT_undo_push_begin(ob, "Mask Filter");
+  SCULPT_undo_push_begin(ob, op);
 
   for (int i = 0; i < totnode; i++) {
     SCULPT_undo_push_node(ob, nodes[i], SCULPT_UNDO_MASK);
@@ -217,7 +219,8 @@ static int sculpt_mask_filter_exec(bContext *C, wmOperator *op)
     if (ELEM(filter_type, MASK_FILTER_GROW, MASK_FILTER_SHRINK)) {
       prev_mask = MEM_mallocN(num_verts * sizeof(float), "prevmask");
       for (int j = 0; j < num_verts; j++) {
-        prev_mask[j] = SCULPT_vertex_mask_get(ss, j);
+        PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, j);
+        prev_mask[j] = SCULPT_vertex_mask_get(ss, vertex);
       }
     }
 
@@ -308,9 +311,9 @@ static float neighbor_dirty_mask(SculptSession *ss, PBVHVertexIter *vd)
   zero_v3(avg);
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd->index, ni) {
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd->vertex, ni) {
     float normalized[3];
-    sub_v3_v3v3(normalized, SCULPT_vertex_co_get(ss, ni.index), vd->co);
+    sub_v3_v3v3(normalized, SCULPT_vertex_co_get(ss, ni.vertex), vd->co);
     normalize_v3(normalized);
     add_v3_v3(avg, normalized);
     total++;
@@ -386,10 +389,6 @@ static void dirty_mask_apply_task_cb(void *__restrict userdata,
       mask = fminf(mask, 0.5f) * 2.0f;
     }
     *vd.mask = CLAMPIS(mask, 0.0f, 1.0f);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
   BKE_pbvh_node_mark_update_mask(node);
@@ -415,7 +414,7 @@ static int sculpt_dirty_mask_exec(bContext *C, wmOperator *op)
   }
 
   BKE_pbvh_search_gather(pbvh, NULL, NULL, &nodes, &totnode);
-  SCULPT_undo_push_begin(ob, "Dirty Mask");
+  SCULPT_undo_push_begin(ob, op);
 
   for (int i = 0; i < totnode; i++) {
     SCULPT_undo_push_node(ob, nodes[i], SCULPT_UNDO_MASK);
diff --git a/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c b/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
index c0adf5aef20..e576cfda3af 100644
--- a/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
+++ b/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
@@ -296,7 +296,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
     float fade = vd.mask ? *vd.mask : 0.0f;
     fade = 1.0f - fade;
     fade *= data->filter_strength;
-    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.index);
+    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.vertex);
 
     if (fade == 0.0f && filter_type != MESH_FILTER_SURFACE_SMOOTH) {
       /* Surface Smooth can't skip the loop for this vertex as it needs to calculate its
@@ -314,7 +314,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
     }
 
     if (filter_type == MESH_FILTER_RELAX_FACE_SETS) {
-      if (relax_face_sets == SCULPT_vertex_has_unique_face_set(ss, vd.index)) {
+      if (relax_face_sets == SCULPT_vertex_has_unique_face_set(ss, vd.vertex)) {
         continue;
       }
     }
@@ -322,7 +322,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
     switch (filter_type) {
       case MESH_FILTER_SMOOTH:
         fade = clamp_f(fade, -1.0f, 1.0f);
-        SCULPT_neighbor_coords_average_interior(ss, avg, vd.index);
+        SCULPT_neighbor_coords_average_interior(ss, avg, vd.vertex);
         sub_v3_v3v3(val, avg, orig_co);
         madd_v3_v3v3fl(val, orig_co, val, fade);
         sub_v3_v3v3(disp, val, orig_co);
@@ -385,7 +385,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
                                              disp,
                                              vd.co,
                                              ss->filter_cache->surface_smooth_laplacian_disp,
-                                             vd.index,
+                                             vd.vertex,
                                              orig_data.co,
                                              ss->filter_cache->surface_smooth_shape_preservation);
         break;
@@ -399,10 +399,10 @@ static void mesh_filter_task_cb(void *__restrict userdata,
         float disp_sharpen[3] = {0.0f, 0.0f, 0.0f};
 
         SculptVertexNeighborIter ni;
-        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
           float disp_n[3];
           sub_v3_v3v3(
-              disp_n, SCULPT_vertex_co_get(ss, ni.index), SCULPT_vertex_co_get(ss, vd.index));
+              disp_n, SCULPT_vertex_co_get(ss, ni.vertex), SCULPT_vertex_co_get(ss, vd.vertex));
           mul_v3_fl(disp_n, ss->filter_cache->sharpen_factor[ni.index]);
           add_v3_v3(disp_sharpen, disp_n);
         }
@@ -412,7 +412,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
 
         float disp_avg[3];
         float avg_co[3];
-        SCULPT_neighbor_coords_average(ss, avg_co, vd.index);
+        SCULPT_neighbor_coords_average(ss, avg_co, vd.vertex);
         sub_v3_v3v3(disp_avg, avg_co, vd.co);
         mul_v3_v3fl(
             disp_avg, disp_avg, smooth_ratio * pow2f(ss->filter_cache->sharpen_factor[vd.index]));
@@ -457,7 +457,7 @@ static void mesh_filter_task_cb(void *__restrict userdata,
     }
     copy_v3_v3(vd.co, final_pos);
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -473,9 +473,11 @@ static void mesh_filter_enhance_details_init_directions(SculptSession *ss)
   filter_cache->detail_directions = MEM_malloc_arrayN(
       totvert, sizeof(float[3]), "detail directions");
   for (int i = 0; i < totvert; i++) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     float avg[3];
-    SCULPT_neighbor_coords_average(ss, avg, i);
-    sub_v3_v3v3(filter_cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, i));
+    SCULPT_neighbor_coords_average(ss, avg, vertex);
+    sub_v3_v3v3(filter_cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, vertex));
   }
 }
 
@@ -500,7 +502,9 @@ static void mesh_filter_init_limit_surface_co(SculptSession *ss)
   filter_cache->limit_surface_co = MEM_malloc_arrayN(
       totvert, sizeof(float[3]), "limit surface co");
   for (int i = 0; i < totvert; i++) {
-    SCULPT_vertex_limit_surface_get(ss, i, filter_cache->limit_surface_co[i]);
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    SCULPT_vertex_limit_surface_get(ss, vertex, filter_cache->limit_surface_co[i]);
   }
 }
 
@@ -520,9 +524,11 @@ static void mesh_filter_sharpen_init(SculptSession *ss,
       totvert, sizeof(float[3]), "sharpen detail direction");
 
   for (int i = 0; i < totvert; i++) {
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
     float avg[3];
-    SCULPT_neighbor_coords_average(ss, avg, i);
-    sub_v3_v3v3(filter_cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, i));
+    SCULPT_neighbor_coords_average(ss, avg, vertex);
+    sub_v3_v3v3(filter_cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, vertex));
     filter_cache->sharpen_factor[i] = len_v3(filter_cache->detail_directions[i]);
   }
 
@@ -544,12 +550,14 @@ static void mesh_filter_sharpen_init(SculptSession *ss,
        smooth_iterations < filter_cache->sharpen_curvature_smooth_iterations;
        smooth_iterations++) {
     for (int i = 0; i < totvert; i++) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
       float direction_avg[3] = {0.0f, 0.0f, 0.0f};
       float sharpen_avg = 0;
       int total = 0;
 
       SculptVertexNeighborIter ni;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
         add_v3_v3(direction_avg, filter_cache->detail_directions[ni.index]);
         sharpen_avg += filter_cache->sharpen_factor[ni.index];
         total++;
@@ -576,7 +584,7 @@ static void mesh_filter_surface_smooth_displace_task_cb(
     float fade = vd.mask ? *vd.mask : 0.0f;
     fade = 1.0f - fade;
     fade *= data->filter_strength;
-    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.index);
+    fade *= SCULPT_automasking_factor_get(ss->filter_cache->automasking, ss, vd.vertex);
     if (fade == 0.0f) {
       continue;
     }
@@ -584,7 +592,7 @@ static void mesh_filter_surface_smooth_displace_task_cb(
     SCULPT_surface_smooth_displace_step(ss,
                                         vd.co,
                                         ss->filter_cache->surface_smooth_laplacian_disp,
-                                        vd.index,
+                                        vd.vertex,
                                         ss->filter_cache->surface_smooth_current_vertex,
                                         clamp_f(fade, 0.0f, 1.0f));
   }
@@ -686,7 +694,7 @@ static int sculpt_mesh_filter_invoke(bContext *C, wmOperator *op, const wmEvent
     SCULPT_boundary_info_ensure(ob);
   }
 
-  SCULPT_undo_push_begin(ob, "Mesh Filter");
+  SCULPT_undo_push_begin(ob, op);
 
   SCULPT_filter_cache_init(C, ob, sd, SCULPT_UNDO_COORDS);
 
diff --git a/source/blender/editors/sculpt_paint/sculpt_geodesic.c b/source/blender/editors/sculpt_paint/sculpt_geodesic.c
index 1beb5d48961..5dd602bc36d 100644
--- a/source/blender/editors/sculpt_paint/sculpt_geodesic.c
+++ b/source/blender/editors/sculpt_paint/sculpt_geodesic.c
@@ -37,7 +37,6 @@
 #include "DEG_depsgraph.h"
 
 #include "WM_api.h"
-#include "WM_message.h"
 #include "WM_toolsystem.h"
 #include "WM_types.h"
 
@@ -62,9 +61,9 @@
 
 /* Propagate distance from v1 and v2 to v0. */
 static bool sculpt_geodesic_mesh_test_dist_add(
-    MVert *mvert, const int v0, const int v1, const int v2, float *dists, GSet *initial_vertices)
+    MVert *mvert, const int v0, const int v1, const int v2, float *dists, GSet *initial_verts)
 {
-  if (BLI_gset_haskey(initial_vertices, POINTER_FROM_INT(v0))) {
+  if (BLI_gset_haskey(initial_verts, POINTER_FROM_INT(v0))) {
     return false;
   }
 
@@ -97,7 +96,7 @@ static bool sculpt_geodesic_mesh_test_dist_add(
 }
 
 static float *SCULPT_geodesic_mesh_create(Object *ob,
-                                          GSet *initial_vertices,
+                                          GSet *initial_verts,
                                           const float limit_radius)
 {
   SculptSession *ss = ob->sculpt;
@@ -108,8 +107,10 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
 
   const float limit_radius_sq = limit_radius * limit_radius;
 
-  MEdge *edges = mesh->medge;
   MVert *verts = SCULPT_mesh_deformed_mverts_get(ss);
+  const MEdge *edges = BKE_mesh_edges(mesh);
+  const MPoly *polys = BKE_mesh_polys(mesh);
+  const MLoop *loops = BKE_mesh_loops(mesh);
 
   float *dists = MEM_malloc_arrayN(totvert, sizeof(float), "distances");
   BLI_bitmap *edge_tag = BLI_BITMAP_NEW(totedge, "edge tag");
@@ -117,16 +118,15 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
   if (!ss->epmap) {
     BKE_mesh_edge_poly_map_create(&ss->epmap,
                                   &ss->epmap_mem,
-                                  mesh->medge,
+                                  edges,
                                   mesh->totedge,
-                                  mesh->mpoly,
+                                  polys,
                                   mesh->totpoly,
-                                  mesh->mloop,
+                                  loops,
                                   mesh->totloop);
   }
   if (!ss->vemap) {
-    BKE_mesh_vert_edge_map_create(
-        &ss->vemap, &ss->vemap_mem, mesh->medge, mesh->totvert, mesh->totedge);
+    BKE_mesh_vert_edge_map_create(&ss->vemap, &ss->vemap_mem, edges, mesh->totvert, mesh->totedge);
   }
 
   /* Both contain edge indices encoded as *void. */
@@ -137,7 +137,7 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
   BLI_LINKSTACK_INIT(queue_next);
 
   for (int i = 0; i < totvert; i++) {
-    if (BLI_gset_haskey(initial_vertices, POINTER_FROM_INT(i))) {
+    if (BLI_gset_haskey(initial_verts, POINTER_FROM_INT(i))) {
       dists[i] = 0.0f;
     }
     else {
@@ -159,7 +159,7 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
     /* This is an O(n^2) loop used to limit the geodesic distance calculation to a radius. When
      * this optimization is needed, it is expected for the tool to request the distance to a low
      * number of vertices (usually just 1 or 2). */
-    GSET_ITER (gs_iter, initial_vertices) {
+    GSET_ITER (gs_iter, initial_verts) {
       const int v = POINTER_AS_INT(BLI_gsetIterator_getKey(&gs_iter));
       float *v_co = verts[v].co;
       for (int i = 0; i < totvert; i++) {
@@ -193,25 +193,24 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
           SWAP(int, v1, v2);
         }
         sculpt_geodesic_mesh_test_dist_add(
-            verts, v2, v1, SCULPT_GEODESIC_VERTEX_NONE, dists, initial_vertices);
+            verts, v2, v1, SCULPT_GEODESIC_VERTEX_NONE, dists, initial_verts);
       }
 
       if (ss->epmap[e].count != 0) {
         for (int poly_map_index = 0; poly_map_index < ss->epmap[e].count; poly_map_index++) {
           const int poly = ss->epmap[e].indices[poly_map_index];
-          if (ss->face_sets[poly] <= 0) {
+          if (ss->hide_poly && ss->hide_poly[poly]) {
             continue;
           }
-          const MPoly *mpoly = &mesh->mpoly[poly];
+          const MPoly *mpoly = &polys[poly];
 
           for (int loop_index = 0; loop_index < mpoly->totloop; loop_index++) {
-            const MLoop *mloop = &mesh->mloop[loop_index + mpoly->loopstart];
+            const MLoop *mloop = &loops[loop_index + mpoly->loopstart];
             const int v_other = mloop->v;
             if (ELEM(v_other, v1, v2)) {
               continue;
             }
-            if (sculpt_geodesic_mesh_test_dist_add(
-                    verts, v_other, v1, v2, dists, initial_vertices)) {
+            if (sculpt_geodesic_mesh_test_dist_add(verts, v_other, v1, v2, dists, initial_verts)) {
               for (int edge_map_index = 0; edge_map_index < ss->vemap[v_other].count;
                    edge_map_index++) {
                 const int e_other = ss->vemap[v_other].indices[edge_map_index];
@@ -258,7 +257,7 @@ static float *SCULPT_geodesic_mesh_create(Object *ob,
 /* For sculpt mesh data that does not support a geodesic distances algorithm, fallback to the
  * distance to each vertex. In this case, only one of the initial vertices will be used to
  * calculate the distance. */
-static float *SCULPT_geodesic_fallback_create(Object *ob, GSet *initial_vertices)
+static float *SCULPT_geodesic_fallback_create(Object *ob, GSet *initial_verts)
 {
 
   SculptSession *ss = ob->sculpt;
@@ -267,7 +266,7 @@ static float *SCULPT_geodesic_fallback_create(Object *ob, GSet *initial_vertices
   float *dists = MEM_malloc_arrayN(totvert, sizeof(float), "distances");
   int first_affected = SCULPT_GEODESIC_VERTEX_NONE;
   GSetIterator gs_iter;
-  GSET_ITER (gs_iter, initial_vertices) {
+  GSET_ITER (gs_iter, initial_verts) {
     first_affected = POINTER_AS_INT(BLI_gsetIterator_getKey(&gs_iter));
     break;
   }
@@ -279,25 +278,26 @@ static float *SCULPT_geodesic_fallback_create(Object *ob, GSet *initial_vertices
     return dists;
   }
 
-  const float *first_affected_co = SCULPT_vertex_co_get(ss, first_affected);
+  const float *first_affected_co = SCULPT_vertex_co_get(
+      ss, BKE_pbvh_index_to_vertex(ss->pbvh, first_affected));
   for (int i = 0; i < totvert; i++) {
-    dists[i] = len_v3v3(first_affected_co, SCULPT_vertex_co_get(ss, i));
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    dists[i] = len_v3v3(first_affected_co, SCULPT_vertex_co_get(ss, vertex));
   }
 
   return dists;
 }
 
-float *SCULPT_geodesic_distances_create(Object *ob,
-                                        GSet *initial_vertices,
-                                        const float limit_radius)
+float *SCULPT_geodesic_distances_create(Object *ob, GSet *initial_verts, const float limit_radius)
 {
   SculptSession *ss = ob->sculpt;
   switch (BKE_pbvh_type(ss->pbvh)) {
     case PBVH_FACES:
-      return SCULPT_geodesic_mesh_create(ob, initial_vertices, limit_radius);
+      return SCULPT_geodesic_mesh_create(ob, initial_verts, limit_radius);
     case PBVH_BMESH:
     case PBVH_GRIDS:
-      return SCULPT_geodesic_fallback_create(ob, initial_vertices);
+      return SCULPT_geodesic_fallback_create(ob, initial_verts);
   }
   BLI_assert(false);
   return NULL;
@@ -305,16 +305,17 @@ float *SCULPT_geodesic_distances_create(Object *ob,
 
 float *SCULPT_geodesic_from_vertex_and_symm(Sculpt *sd,
                                             Object *ob,
-                                            const int vertex,
+                                            const PBVHVertRef vertex,
                                             const float limit_radius)
 {
   SculptSession *ss = ob->sculpt;
-  GSet *initial_vertices = BLI_gset_int_new("initial_vertices");
+  GSet *initial_verts = BLI_gset_int_new("initial_verts");
 
   const char symm = SCULPT_mesh_symmetry_xyz_get(ob);
   for (char i = 0; i <= symm; ++i) {
     if (SCULPT_is_symmetry_iteration_valid(i, symm)) {
-      int v = -1;
+      PBVHVertRef v = {PBVH_REF_NONE};
+
       if (i == 0) {
         v = vertex;
       }
@@ -323,22 +324,23 @@ float *SCULPT_geodesic_from_vertex_and_symm(Sculpt *sd,
         flip_v3_v3(location, SCULPT_vertex_co_get(ss, vertex), i);
         v = SCULPT_nearest_vertex_get(sd, ob, location, FLT_MAX, false);
       }
-      if (v != -1) {
-        BLI_gset_add(initial_vertices, POINTER_FROM_INT(v));
+      if (v.i != PBVH_REF_NONE) {
+        BLI_gset_add(initial_verts, POINTER_FROM_INT(BKE_pbvh_vertex_to_index(ss->pbvh, v)));
       }
     }
   }
 
-  float *dists = SCULPT_geodesic_distances_create(ob, initial_vertices, limit_radius);
-  BLI_gset_free(initial_vertices, NULL);
+  float *dists = SCULPT_geodesic_distances_create(ob, initial_verts, limit_radius);
+  BLI_gset_free(initial_verts, NULL);
   return dists;
 }
 
-float *SCULPT_geodesic_from_vertex(Object *ob, const int vertex, const float limit_radius)
+float *SCULPT_geodesic_from_vertex(Object *ob, const PBVHVertRef vertex, const float limit_radius)
 {
-  GSet *initial_vertices = BLI_gset_int_new("initial_vertices");
-  BLI_gset_add(initial_vertices, POINTER_FROM_INT(vertex));
-  float *dists = SCULPT_geodesic_distances_create(ob, initial_vertices, limit_radius);
-  BLI_gset_free(initial_vertices, NULL);
+  GSet *initial_verts = BLI_gset_int_new("initial_verts");
+  BLI_gset_add(initial_verts,
+               POINTER_FROM_INT(BKE_pbvh_vertex_to_index(ob->sculpt->pbvh, vertex)));
+  float *dists = SCULPT_geodesic_distances_create(ob, initial_verts, limit_radius);
+  BLI_gset_free(initial_verts, NULL);
   return dists;
 }
diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index 8485c7fcbf9..cdfa9c2586f 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -59,10 +59,13 @@ typedef struct SculptCursorGeometryInfo {
 
 typedef struct SculptVertexNeighborIter {
   /* Storage */
-  int *neighbors;
+  PBVHVertRef *neighbors;
+  int *neighbor_indices;
   int size;
   int capacity;
-  int neighbors_fixed[SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY];
+
+  PBVHVertRef neighbors_fixed[SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY];
+  int neighbor_indices_fixed[SCULPT_VERTEX_NEIGHBOR_FIXED_CAPACITY];
 
   /* Internal iterator. */
   int num_duplicates;
@@ -70,6 +73,7 @@ typedef struct SculptVertexNeighborIter {
 
   /* Public */
   int index;
+  PBVHVertRef vertex;
   bool is_duplicate;
 } SculptVertexNeighborIter;
 
@@ -93,7 +97,7 @@ typedef struct {
 /* Flood Fill. */
 typedef struct {
   GSQueue *queue;
-  BLI_bitmap *visited_vertices;
+  BLI_bitmap *visited_verts;
 } SculptFloodFill;
 
 typedef enum eBoundaryAutomaskMode {
@@ -318,7 +322,7 @@ typedef struct SculptThreadedTaskData {
   bool mask_by_color_preserve_mask;
 
   /* Index of the vertex that is going to be used as a reference for the colors. */
-  int mask_by_color_vertex;
+  PBVHVertRef mask_by_color_vertex;
   float *mask_by_color_floodfill;
 
   int face_set;
@@ -398,9 +402,6 @@ typedef struct AutomaskingSettings {
 
 typedef struct AutomaskingCache {
   AutomaskingSettings settings;
-  /* Precomputed auto-mask factor indexed by vertex, owned by the auto-masking system and
-   * initialized in #SCULPT_automasking_cache_init when needed. */
-  float *factor;
 } AutomaskingCache;
 
 typedef struct FilterCache {
@@ -485,6 +486,7 @@ typedef struct StrokeCache {
   float true_last_location[3];
   float location[3];
   float last_location[3];
+  float stroke_distance;
 
   /* Used for alternating between deformation in brushes that need to apply different ones to
    * achieve certain effects. */
@@ -690,7 +692,8 @@ typedef struct ExpandCache {
    * during the execution of Expand by moving the origin. */
   float initial_mouse_move[2];
   float initial_mouse[2];
-  int initial_active_vertex;
+  PBVHVertRef initial_active_vertex;
+  int initial_active_vertex_i;
   int initial_active_face_set;
 
   /* Maximum number of vertices allowed in the SculptSession for previewing the falloff using
@@ -845,7 +848,10 @@ void SCULPT_tag_update_overlays(bContext *C);
  * (This allows us to ignore the GL depth buffer)
  * Returns 0 if the ray doesn't hit the mesh, non-zero otherwise.
  */
-bool SCULPT_stroke_get_location(struct bContext *C, float out[3], const float mouse[2]);
+bool SCULPT_stroke_get_location(struct bContext *C,
+                                float out[3],
+                                const float mouse[2],
+                                bool force_original);
 /**
  * Gets the normal, location and active vertex location of the geometry under the cursor. This also
  * updates the active vertex and cursor related data of the SculptSession using the mouse position
@@ -895,14 +901,14 @@ bool SCULPT_stroke_is_first_brush_step_of_symmetry_pass(struct StrokeCache *cach
 void SCULPT_vertex_random_access_ensure(struct SculptSession *ss);
 
 int SCULPT_vertex_count_get(struct SculptSession *ss);
-const float *SCULPT_vertex_co_get(struct SculptSession *ss, int index);
+const float *SCULPT_vertex_co_get(struct SculptSession *ss, PBVHVertRef vertex);
 
 /** Get the normal for a given sculpt vertex; do not modify the result */
-void SCULPT_vertex_normal_get(SculptSession *ss, int index, float no[3]);
+void SCULPT_vertex_normal_get(SculptSession *ss, PBVHVertRef vertex, float no[3]);
 
-float SCULPT_vertex_mask_get(struct SculptSession *ss, int index);
-void SCULPT_vertex_color_get(const SculptSession *ss, int index, float r_color[4]);
-void SCULPT_vertex_color_set(SculptSession *ss, int index, const float color[4]);
+float SCULPT_vertex_mask_get(struct SculptSession *ss, PBVHVertRef vertex);
+void SCULPT_vertex_color_get(const SculptSession *ss, PBVHVertRef vertex, float r_color[4]);
+void SCULPT_vertex_color_set(SculptSession *ss, PBVHVertRef vertex, const float color[4]);
 
 /** Returns true if a color attribute exists in the current sculpt session. */
 bool SCULPT_has_colors(const SculptSession *ss);
@@ -910,19 +916,19 @@ bool SCULPT_has_colors(const SculptSession *ss);
 /** Returns true if the active color attribute is on loop (ATTR_DOMAIN_CORNER) domain. */
 bool SCULPT_has_loop_colors(const struct Object *ob);
 
-const float *SCULPT_vertex_persistent_co_get(SculptSession *ss, int index);
-void SCULPT_vertex_persistent_normal_get(SculptSession *ss, int index, float no[3]);
+const float *SCULPT_vertex_persistent_co_get(SculptSession *ss, PBVHVertRef vertex);
+void SCULPT_vertex_persistent_normal_get(SculptSession *ss, PBVHVertRef vertex, float no[3]);
 
 /**
  * Coordinates used for manipulating the base mesh when Grab Active Vertex is enabled.
  */
-const float *SCULPT_vertex_co_for_grab_active_get(SculptSession *ss, int index);
+const float *SCULPT_vertex_co_for_grab_active_get(SculptSession *ss, PBVHVertRef vertex);
 
 /**
  * Returns the info of the limit surface when multi-res is available,
  * otherwise it returns the current coordinate of the vertex.
  */
-void SCULPT_vertex_limit_surface_get(SculptSession *ss, int index, float r_co[3]);
+void SCULPT_vertex_limit_surface_get(SculptSession *ss, PBVHVertRef vertex, float r_co[3]);
 
 /**
  * Returns the pointer to the coordinates that should be edited from a brush tool iterator
@@ -933,7 +939,7 @@ float *SCULPT_brush_deform_target_vertex_co_get(SculptSession *ss,
                                                 PBVHVertexIter *iter);
 
 void SCULPT_vertex_neighbors_get(struct SculptSession *ss,
-                                 int index,
+                                 PBVHVertRef vertex,
                                  bool include_duplicates,
                                  SculptVertexNeighborIter *iter);
 
@@ -942,7 +948,8 @@ void SCULPT_vertex_neighbors_get(struct SculptSession *ss,
   SCULPT_vertex_neighbors_get(ss, v_index, false, &neighbor_iterator); \
   for (neighbor_iterator.i = 0; neighbor_iterator.i < neighbor_iterator.size; \
        neighbor_iterator.i++) { \
-    neighbor_iterator.index = neighbor_iterator.neighbors[neighbor_iterator.i];
+    neighbor_iterator.vertex = neighbor_iterator.neighbors[neighbor_iterator.i]; \
+    neighbor_iterator.index = neighbor_iterator.neighbor_indices[neighbor_iterator.i];
 
 /** Iterate over neighboring and duplicate vertices (for PBVH_GRIDS). Duplicates come
  * first since they are nearest for floodfill. */
@@ -950,7 +957,8 @@ void SCULPT_vertex_neighbors_get(struct SculptSession *ss,
   SCULPT_vertex_neighbors_get(ss, v_index, true, &neighbor_iterator); \
   for (neighbor_iterator.i = neighbor_iterator.size - 1; neighbor_iterator.i >= 0; \
        neighbor_iterator.i--) { \
-    neighbor_iterator.index = neighbor_iterator.neighbors[neighbor_iterator.i]; \
+    neighbor_iterator.vertex = neighbor_iterator.neighbors[neighbor_iterator.i]; \
+    neighbor_iterator.index = neighbor_iterator.neighbor_indices[neighbor_iterator.i]; \
     neighbor_iterator.is_duplicate = (neighbor_iterator.i >= \
                                       neighbor_iterator.size - neighbor_iterator.num_duplicates);
 
@@ -961,7 +969,7 @@ void SCULPT_vertex_neighbors_get(struct SculptSession *ss,
   } \
   ((void)0)
 
-int SCULPT_active_vertex_get(SculptSession *ss);
+PBVHVertRef SCULPT_active_vertex_get(SculptSession *ss);
 const float *SCULPT_active_vertex_co_get(SculptSession *ss);
 void SCULPT_active_vertex_normal_get(SculptSession *ss, float normal[3]);
 
@@ -981,7 +989,7 @@ void SCULPT_fake_neighbors_free(struct Object *ob);
 /* Vertex Info. */
 void SCULPT_boundary_info_ensure(Object *object);
 /* Boundary Info needs to be initialized in order to use this function. */
-bool SCULPT_vertex_is_boundary(const SculptSession *ss, int index);
+bool SCULPT_vertex_is_boundary(const SculptSession *ss, PBVHVertRef vertex);
 
 void SCULPT_connected_components_ensure(Object *ob);
 
@@ -991,11 +999,15 @@ void SCULPT_connected_components_ensure(Object *ob);
 /** \name Sculpt Visibility API
  * \{ */
 
-void SCULPT_vertex_visible_set(SculptSession *ss, int index, bool visible);
-bool SCULPT_vertex_visible_get(SculptSession *ss, int index);
+void SCULPT_vertex_visible_set(SculptSession *ss, PBVHVertRef vertex, bool visible);
+bool SCULPT_vertex_visible_get(SculptSession *ss, PBVHVertRef vertex);
+bool SCULPT_vertex_all_faces_visible_get(const SculptSession *ss, PBVHVertRef vertex);
+bool SCULPT_vertex_any_face_visible_get(SculptSession *ss, PBVHVertRef vertex);
+
+void SCULPT_face_visibility_all_invert(SculptSession *ss);
+void SCULPT_face_visibility_all_set(SculptSession *ss, bool visible);
 
-void SCULPT_visibility_sync_all_face_sets_to_vertices(struct Object *ob);
-void SCULPT_visibility_sync_all_vertex_to_face_sets(struct SculptSession *ss);
+void SCULPT_visibility_sync_all_from_faces(struct Object *ob);
 
 /** \} */
 
@@ -1004,20 +1016,15 @@ void SCULPT_visibility_sync_all_vertex_to_face_sets(struct SculptSession *ss);
  * \{ */
 
 int SCULPT_active_face_set_get(SculptSession *ss);
-int SCULPT_vertex_face_set_get(SculptSession *ss, int index);
-void SCULPT_vertex_face_set_set(SculptSession *ss, int index, int face_set);
+int SCULPT_vertex_face_set_get(SculptSession *ss, PBVHVertRef vertex);
+void SCULPT_vertex_face_set_set(SculptSession *ss, PBVHVertRef vertex, int face_set);
 
-bool SCULPT_vertex_has_face_set(SculptSession *ss, int index, int face_set);
-bool SCULPT_vertex_has_unique_face_set(SculptSession *ss, int index);
+bool SCULPT_vertex_has_face_set(SculptSession *ss, PBVHVertRef vertex, int face_set);
+bool SCULPT_vertex_has_unique_face_set(SculptSession *ss, PBVHVertRef vertex);
 
 int SCULPT_face_set_next_available_get(SculptSession *ss);
 
 void SCULPT_face_set_visibility_set(SculptSession *ss, int face_set, bool visible);
-bool SCULPT_vertex_all_face_sets_visible_get(const SculptSession *ss, int index);
-bool SCULPT_vertex_any_face_set_visible_get(SculptSession *ss, int index);
-
-void SCULPT_face_sets_visibility_invert(SculptSession *ss);
-void SCULPT_face_sets_visibility_all_set(SculptSession *ss, bool visible);
 
 /** \} */
 
@@ -1100,11 +1107,11 @@ void SCULPT_calc_area_normal_and_center(
 void SCULPT_calc_area_center(
     Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode, float r_area_co[3]);
 
-int SCULPT_nearest_vertex_get(struct Sculpt *sd,
-                              struct Object *ob,
-                              const float co[3],
-                              float max_distance,
-                              bool use_original);
+PBVHVertRef SCULPT_nearest_vertex_get(struct Sculpt *sd,
+                                      struct Object *ob,
+                                      const float co[3],
+                                      float max_distance,
+                                      bool use_original);
 
 int SCULPT_plane_point_side(const float co[3], const float plane[4]);
 int SCULPT_plane_trim(const struct StrokeCache *cache,
@@ -1183,7 +1190,7 @@ float SCULPT_brush_strength_factor(struct SculptSession *ss,
                                    const float vno[3],
                                    const float fno[3],
                                    float mask,
-                                   int vertex_index,
+                                   const PBVHVertRef vertex,
                                    int thread_id);
 
 /**
@@ -1214,15 +1221,18 @@ void SCULPT_floodfill_add_initial_with_symmetry(struct Sculpt *sd,
                                                 struct Object *ob,
                                                 struct SculptSession *ss,
                                                 SculptFloodFill *flood,
-                                                int index,
+                                                PBVHVertRef vertex,
                                                 float radius);
-void SCULPT_floodfill_add_initial(SculptFloodFill *flood, int index);
-void SCULPT_floodfill_add_and_skip_initial(SculptFloodFill *flood, int index);
-void SCULPT_floodfill_execute(
-    struct SculptSession *ss,
-    SculptFloodFill *flood,
-    bool (*func)(SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata),
-    void *userdata);
+void SCULPT_floodfill_add_initial(SculptFloodFill *flood, PBVHVertRef vertex);
+void SCULPT_floodfill_add_and_skip_initial(SculptFloodFill *flood, PBVHVertRef vertex);
+void SCULPT_floodfill_execute(struct SculptSession *ss,
+                              SculptFloodFill *flood,
+                              bool (*func)(SculptSession *ss,
+                                           PBVHVertRef from_v,
+                                           PBVHVertRef to_v,
+                                           bool is_duplicate,
+                                           void *userdata),
+                              void *userdata);
 void SCULPT_floodfill_free(SculptFloodFill *flood);
 
 /** \} */
@@ -1260,7 +1270,6 @@ void sculpt_dynamic_topology_disable_with_undo(struct Main *bmain,
 bool SCULPT_stroke_is_dynamic_topology(const SculptSession *ss, const Brush *brush);
 
 void SCULPT_dynamic_topology_triangulate(struct BMesh *bm);
-void SCULPT_dyntopo_node_layers_add(struct SculptSession *ss);
 
 enum eDynTopoWarnFlag SCULPT_dynamic_topology_check(Scene *scene, Object *ob);
 
@@ -1272,7 +1281,7 @@ enum eDynTopoWarnFlag SCULPT_dynamic_topology_check(Scene *scene, Object *ob);
 
 float SCULPT_automasking_factor_get(struct AutomaskingCache *automasking,
                                     SculptSession *ss,
-                                    int vert);
+                                    PBVHVertRef vertex);
 
 /* Returns the automasking cache depending on the active tool. Used for code that can run both for
  * brushes and filter. */
@@ -1305,9 +1314,9 @@ float *SCULPT_geodesic_distances_create(struct Object *ob,
                                         float limit_radius);
 float *SCULPT_geodesic_from_vertex_and_symm(struct Sculpt *sd,
                                             struct Object *ob,
-                                            int vertex,
+                                            PBVHVertRef vertex,
                                             float limit_radius);
-float *SCULPT_geodesic_from_vertex(Object *ob, int vertex, float limit_radius);
+float *SCULPT_geodesic_from_vertex(Object *ob, PBVHVertRef vertex, float limit_radius);
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -1341,7 +1350,7 @@ void SCULPT_cloth_simulation_free(struct SculptClothSimulation *cloth_sim);
 
 /* Public functions. */
 
-struct SculptClothSimulation *SCULPT_cloth_brush_simulation_create(struct SculptSession *ss,
+struct SculptClothSimulation *SCULPT_cloth_brush_simulation_create(struct Object *ob,
                                                                    float cloth_mass,
                                                                    float cloth_damping,
                                                                    float cloth_softbody_strength,
@@ -1413,14 +1422,16 @@ BLI_INLINE bool SCULPT_is_cloth_deform_brush(const Brush *brush)
  */
 void SCULPT_bmesh_four_neighbor_average(float avg[3], float direction[3], struct BMVert *v);
 
-void SCULPT_neighbor_coords_average(SculptSession *ss, float result[3], int index);
-float SCULPT_neighbor_mask_average(SculptSession *ss, int index);
-void SCULPT_neighbor_color_average(SculptSession *ss, float result[4], int index);
+void SCULPT_neighbor_coords_average(SculptSession *ss, float result[3], PBVHVertRef vertex);
+float SCULPT_neighbor_mask_average(SculptSession *ss, PBVHVertRef vertex);
+void SCULPT_neighbor_color_average(SculptSession *ss, float result[4], PBVHVertRef vertex);
 
 /**
  * Mask the mesh boundaries smoothing only the mesh surface without using auto-masking.
  */
-void SCULPT_neighbor_coords_average_interior(SculptSession *ss, float result[3], int index);
+void SCULPT_neighbor_coords_average_interior(SculptSession *ss,
+                                             float result[3],
+                                             PBVHVertRef vertex);
 
 void SCULPT_smooth(
     Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode, float bstrength, bool smooth_mask);
@@ -1432,11 +1443,15 @@ void SCULPT_surface_smooth_laplacian_step(SculptSession *ss,
                                           float *disp,
                                           const float co[3],
                                           float (*laplacian_disp)[3],
-                                          int v_index,
+                                          PBVHVertRef vertex,
                                           const float origco[3],
                                           float alpha);
-void SCULPT_surface_smooth_displace_step(
-    SculptSession *ss, float *co, float (*laplacian_disp)[3], int v_index, float beta, float fade);
+void SCULPT_surface_smooth_displace_step(SculptSession *ss,
+                                         float *co,
+                                         float (*laplacian_disp)[3],
+                                         PBVHVertRef vertex,
+                                         float beta,
+                                         float fade);
 void SCULPT_do_surface_smooth_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode);
 
 /* Slide/Relax */
@@ -1474,10 +1489,17 @@ SculptUndoNode *SCULPT_undo_get_node(PBVHNode *node, SculptUndoType type);
 SculptUndoNode *SCULPT_undo_get_first_node(void);
 
 /**
- * NOTE: `name` must match operator name for
- * redo panels to work.
+ * Pushes an undo step using the operator name. This is necessary for
+ * redo panels to work; operators that do not support that may use
+ * #SCULPT_undo_push_begin_ex instead if so desired.
  */
-void SCULPT_undo_push_begin(struct Object *ob, const char *name);
+void SCULPT_undo_push_begin(struct Object *ob, const struct wmOperator *op);
+
+/**
+ * NOTE: #SCULPT_undo_push_begin is preferred since `name`
+ * must match operator name for redo panels to work.
+ */
+void SCULPT_undo_push_begin_ex(struct Object *ob, const char *name);
 void SCULPT_undo_push_end(struct Object *ob);
 void SCULPT_undo_push_end_ex(struct Object *ob, const bool use_nested_undo);
 
@@ -1642,7 +1664,7 @@ void SCULPT_pose_ik_chain_free(struct SculptPoseIKChain *ik_chain);
  */
 struct SculptBoundary *SCULPT_boundary_data_init(Object *object,
                                                  Brush *brush,
-                                                 int initial_vertex,
+                                                 PBVHVertRef initial_vertex,
                                                  float radius);
 void SCULPT_boundary_data_free(struct SculptBoundary *boundary);
 /* Main Brush Function. */
@@ -1810,6 +1832,21 @@ BLI_INLINE bool SCULPT_tool_is_paint(int tool)
   return ELEM(tool, SCULPT_TOOL_PAINT, SCULPT_TOOL_SMEAR);
 }
 
+BLI_INLINE bool SCULPT_tool_is_mask(int tool)
+{
+  return ELEM(tool, SCULPT_TOOL_MASK);
+}
+
+BLI_INLINE bool SCULPT_tool_is_face_sets(int tool)
+{
+  return ELEM(tool, SCULPT_TOOL_DRAW_FACE_SETS);
+}
+
 #ifdef __cplusplus
 }
 #endif
+
+/* Make SCULPT_ alias to a few blenkernel sculpt methods. */
+
+#define SCULPT_vertex_attr_get BKE_sculpt_vertex_attr_get
+#define SCULPT_face_attr_get BKE_sculpt_face_attr_get
diff --git a/source/blender/editors/sculpt_paint/sculpt_mask_expand.c b/source/blender/editors/sculpt_paint/sculpt_mask_expand.c
index 4593c6a8b60..ec246cd3788 100644
--- a/source/blender/editors/sculpt_paint/sculpt_mask_expand.c
+++ b/source/blender/editors/sculpt_paint/sculpt_mask_expand.c
@@ -97,11 +97,14 @@ static void sculpt_expand_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
   int update_it = data->mask_expand_update_it;
 
+  PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
+  int active_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, active_vertex);
+
   BKE_pbvh_vertex_iter_begin (ss->pbvh, node, vd, PBVH_ITER_ALL) {
     int vi = vd.index;
     float final_mask = *vd.mask;
     if (data->mask_expand_use_normals) {
-      if (ss->filter_cache->normal_factor[SCULPT_active_vertex_get(ss)] <
+      if (ss->filter_cache->normal_factor[active_vertex_i] <
           ss->filter_cache->normal_factor[vd.index]) {
         final_mask = 1.0f;
       }
@@ -121,7 +124,7 @@ static void sculpt_expand_task_cb(void *__restrict userdata,
 
     if (data->mask_expand_create_face_set) {
       if (final_mask == 1.0f) {
-        SCULPT_vertex_face_set_set(ss, vd.index, ss->filter_cache->new_face_set);
+        SCULPT_vertex_face_set_set(ss, vd.vertex, ss->filter_cache->new_face_set);
       }
       BKE_pbvh_node_mark_redraw(node);
     }
@@ -136,9 +139,6 @@ static void sculpt_expand_task_cb(void *__restrict userdata,
       }
 
       if (*vd.mask != final_mask) {
-        if (vd.mvert) {
-          BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-        }
         *vd.mask = final_mask;
         BKE_pbvh_node_mark_update_mask(node);
       }
@@ -167,10 +167,13 @@ static int sculpt_mask_expand_modal(bContext *C, wmOperator *op, const wmEvent *
 
   if (RNA_boolean_get(op->ptr, "use_cursor")) {
     SculptCursorGeometryInfo sgi;
+
     const float mval_fl[2] = {UNPACK2(event->mval)};
     if (SCULPT_cursor_geometry_info_update(C, &sgi, mval_fl, false)) {
+      int active_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, SCULPT_active_vertex_get(ss));
+
       /* The cursor is over the mesh, get the update iteration from the updated active vertex. */
-      mask_expand_update_it = ss->filter_cache->mask_update_it[(int)SCULPT_active_vertex_get(ss)];
+      mask_expand_update_it = ss->filter_cache->mask_update_it[active_vertex_i];
     }
     else {
       /* When the cursor is outside the mesh, affect the entire connected component. */
@@ -291,13 +294,16 @@ typedef struct MaskExpandFloodFillData {
 } MaskExpandFloodFillData;
 
 static bool mask_expand_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
   MaskExpandFloodFillData *data = userdata;
 
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   if (!is_duplicate) {
-    int to_it = ss->filter_cache->mask_update_it[from_v] + 1;
-    ss->filter_cache->mask_update_it[to_v] = to_it;
+    int to_it = ss->filter_cache->mask_update_it[from_v_i] + 1;
+    ss->filter_cache->mask_update_it[to_v_i] = to_it;
     if (to_it > ss->filter_cache->mask_update_last_it) {
       ss->filter_cache->mask_update_last_it = to_it;
     }
@@ -306,20 +312,20 @@ static bool mask_expand_floodfill_cb(
       float current_normal[3], prev_normal[3];
       SCULPT_vertex_normal_get(ss, to_v, current_normal);
       SCULPT_vertex_normal_get(ss, from_v, prev_normal);
-      const float from_edge_factor = ss->filter_cache->edge_factor[from_v];
-      ss->filter_cache->edge_factor[to_v] = dot_v3v3(current_normal, prev_normal) *
-                                            from_edge_factor;
-      ss->filter_cache->normal_factor[to_v] = dot_v3v3(data->original_normal, current_normal) *
-                                              powf(from_edge_factor, data->edge_sensitivity);
-      CLAMP(ss->filter_cache->normal_factor[to_v], 0.0f, 1.0f);
+      const float from_edge_factor = ss->filter_cache->edge_factor[from_v_i];
+      ss->filter_cache->edge_factor[to_v_i] = dot_v3v3(current_normal, prev_normal) *
+                                              from_edge_factor;
+      ss->filter_cache->normal_factor[to_v_i] = dot_v3v3(data->original_normal, current_normal) *
+                                                powf(from_edge_factor, data->edge_sensitivity);
+      CLAMP(ss->filter_cache->normal_factor[to_v_i], 0.0f, 1.0f);
     }
   }
   else {
     /* PBVH_GRIDS duplicate handling. */
-    ss->filter_cache->mask_update_it[to_v] = ss->filter_cache->mask_update_it[from_v];
+    ss->filter_cache->mask_update_it[to_v_i] = ss->filter_cache->mask_update_it[from_v_i];
     if (data->use_normals) {
-      ss->filter_cache->edge_factor[to_v] = ss->filter_cache->edge_factor[from_v];
-      ss->filter_cache->normal_factor[to_v] = ss->filter_cache->normal_factor[from_v];
+      ss->filter_cache->edge_factor[to_v_i] = ss->filter_cache->edge_factor[from_v_i];
+      ss->filter_cache->normal_factor[to_v_i] = ss->filter_cache->normal_factor[from_v_i];
     }
   }
 
@@ -355,7 +361,7 @@ static int sculpt_mask_expand_invoke(bContext *C, wmOperator *op, const wmEvent
 
   BKE_pbvh_search_gather(pbvh, NULL, NULL, &ss->filter_cache->nodes, &ss->filter_cache->totnode);
 
-  SCULPT_undo_push_begin(ob, "Mask Expand");
+  SCULPT_undo_push_begin(ob, op);
 
   if (create_face_set) {
     SCULPT_undo_push_node(ob, ss->filter_cache->nodes[0], SCULPT_UNDO_FACE_SETS);
@@ -385,20 +391,24 @@ static int sculpt_mask_expand_invoke(bContext *C, wmOperator *op, const wmEvent
   if (create_face_set) {
     ss->filter_cache->prev_face_set = MEM_callocN(sizeof(float) * ss->totfaces, "prev face mask");
     for (int i = 0; i < ss->totfaces; i++) {
-      ss->filter_cache->prev_face_set[i] = ss->face_sets[i];
+      ss->filter_cache->prev_face_set[i] = ss->face_sets ? ss->face_sets[i] : 0;
     }
     ss->filter_cache->new_face_set = SCULPT_face_set_next_available_get(ss);
   }
   else {
     ss->filter_cache->prev_mask = MEM_callocN(sizeof(float) * vertex_count, "prev mask");
     for (int i = 0; i < vertex_count; i++) {
-      ss->filter_cache->prev_mask[i] = SCULPT_vertex_mask_get(ss, i);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      ss->filter_cache->prev_mask[i] = SCULPT_vertex_mask_get(ss, vertex);
     }
   }
 
+  int active_vertex_i = BKE_pbvh_vertex_to_index(ss->pbvh, SCULPT_active_vertex_get(ss));
+
   ss->filter_cache->mask_update_last_it = 1;
   ss->filter_cache->mask_update_current_it = 1;
-  ss->filter_cache->mask_update_it[SCULPT_active_vertex_get(ss)] = 0;
+  ss->filter_cache->mask_update_it[active_vertex_i] = 0;
 
   copy_v3_v3(ss->filter_cache->mask_expand_initial_co, SCULPT_active_vertex_co_get(ss));
 
@@ -417,9 +427,11 @@ static int sculpt_mask_expand_invoke(bContext *C, wmOperator *op, const wmEvent
   if (use_normals) {
     for (int repeat = 0; repeat < 2; repeat++) {
       for (int i = 0; i < vertex_count; i++) {
+        PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
         float avg = 0.0f;
         SculptVertexNeighborIter ni;
-        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, i, ni) {
+        SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
           avg += ss->filter_cache->normal_factor[ni.index];
         }
         SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
diff --git a/source/blender/editors/sculpt_paint/sculpt_mask_init.c b/source/blender/editors/sculpt_paint/sculpt_mask_init.c
index 025f34ab2d7..b9b889ab2ce 100644
--- a/source/blender/editors/sculpt_paint/sculpt_mask_init.c
+++ b/source/blender/editors/sculpt_paint/sculpt_mask_init.c
@@ -99,7 +99,7 @@ static void mask_init_task_cb(void *__restrict userdata,
         *vd.mask = BLI_hash_int_01(vd.index + seed);
         break;
       case SCULPT_MASK_INIT_RANDOM_PER_FACE_SET: {
-        const int face_set = SCULPT_vertex_face_set_get(ss, vd.index);
+        const int face_set = SCULPT_vertex_face_set_get(ss, vd.vertex);
         *vd.mask = BLI_hash_int_01(face_set + seed);
         break;
       }
@@ -131,7 +131,7 @@ static int sculpt_mask_init_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  SCULPT_undo_push_begin(ob, "init mask");
+  SCULPT_undo_push_begin(ob, op);
 
   if (mode == SCULPT_MASK_INIT_RANDOM_PER_LOOSE_PART) {
     SCULPT_connected_components_ensure(ob);
diff --git a/source/blender/editors/sculpt_paint/sculpt_multiplane_scrape.c b/source/blender/editors/sculpt_paint/sculpt_multiplane_scrape.c
index ddc1a0e1db0..1e8731e54c0 100644
--- a/source/blender/editors/sculpt_paint/sculpt_multiplane_scrape.c
+++ b/source/blender/editors/sculpt_paint/sculpt_multiplane_scrape.c
@@ -86,7 +86,7 @@ static void calc_multiplane_scrape_surface_task_cb(void *__restrict userdata,
                                                     vd.no,
                                                     vd.fno,
                                                     vd.mask ? *vd.mask : 0.0f,
-                                                    vd.index,
+                                                    vd.vertex,
                                                     thread_id);
 
     /* Sample the normal and area of the +X and -X axis individually. */
@@ -194,13 +194,13 @@ static void do_multiplane_scrape_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     mul_v3_v3fl(proxy[vd.i], val, fade);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
diff --git a/source/blender/editors/sculpt_paint/sculpt_ops.c b/source/blender/editors/sculpt_paint/sculpt_ops.c
index f16763be735..52bfa61cd95 100644
--- a/source/blender/editors/sculpt_paint/sculpt_ops.c
+++ b/source/blender/editors/sculpt_paint/sculpt_ops.c
@@ -47,6 +47,7 @@
 #include "BKE_image.h"
 #include "BKE_kelvinlet.h"
 #include "BKE_key.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_mesh.h"
@@ -116,22 +117,33 @@ static int sculpt_set_persistent_base_exec(bContext *C, wmOperator *UNUSED(op))
   Object *ob = CTX_data_active_object(C);
   SculptSession *ss = ob->sculpt;
 
-  if (!ss) {
+  /* Do not allow in DynTopo just yet. */
+  if (!ss || (ss && ss->bm)) {
     return OPERATOR_FINISHED;
   }
   SCULPT_vertex_random_access_ensure(ss);
   BKE_sculpt_update_object_for_edit(depsgraph, ob, false, false, false);
 
-  MEM_SAFE_FREE(ss->persistent_base);
+  SculptAttributeParams params = {0};
+  params.permanent = true;
+
+  ss->attrs.persistent_co = BKE_sculpt_attribute_ensure(
+      ob, ATTR_DOMAIN_POINT, CD_PROP_FLOAT3, SCULPT_ATTRIBUTE_NAME(persistent_co), &params);
+  ss->attrs.persistent_no = BKE_sculpt_attribute_ensure(
+      ob, ATTR_DOMAIN_POINT, CD_PROP_FLOAT3, SCULPT_ATTRIBUTE_NAME(persistent_no), &params);
+  ss->attrs.persistent_disp = BKE_sculpt_attribute_ensure(
+      ob, ATTR_DOMAIN_POINT, CD_PROP_FLOAT, SCULPT_ATTRIBUTE_NAME(persistent_disp), &params);
 
   const int totvert = SCULPT_vertex_count_get(ss);
-  ss->persistent_base = MEM_mallocN(sizeof(SculptPersistentBase) * totvert,
-                                    "layer persistent base");
 
   for (int i = 0; i < totvert; i++) {
-    copy_v3_v3(ss->persistent_base[i].co, SCULPT_vertex_co_get(ss, i));
-    SCULPT_vertex_normal_get(ss, i, ss->persistent_base[i].no);
-    ss->persistent_base[i].disp = 0.0f;
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    copy_v3_v3((float *)SCULPT_vertex_attr_get(vertex, ss->attrs.persistent_co),
+               SCULPT_vertex_co_get(ss, vertex));
+    SCULPT_vertex_normal_get(
+        ss, vertex, (float *)SCULPT_vertex_attr_get(vertex, ss->attrs.persistent_no));
+    (*(float *)SCULPT_vertex_attr_get(vertex, ss->attrs.persistent_disp)) = 0.0f;
   }
 
   return OPERATOR_FINISHED;
@@ -213,7 +225,7 @@ static int sculpt_symmetrize_exec(bContext *C, wmOperator *op)
        * as deleted, then after symmetrize operation all BMesh elements
        * are logged as added (as opposed to attempting to store just the
        * parts that symmetrize modifies). */
-      SCULPT_undo_push_begin(ob, "Dynamic topology symmetrize");
+      SCULPT_undo_push_begin(ob, op);
       SCULPT_undo_push_node(ob, NULL, SCULPT_UNDO_DYNTOPO_SYMMETRIZE);
       BM_log_before_all_removed(ss->bm, ss->bm_log);
 
@@ -240,7 +252,7 @@ static int sculpt_symmetrize_exec(bContext *C, wmOperator *op)
       break;
     case PBVH_FACES:
       /* Mesh Symmetrize. */
-      ED_sculpt_undo_geometry_begin(ob, "mesh symmetrize");
+      ED_sculpt_undo_geometry_begin(ob, op);
       Mesh *mesh = ob->data;
 
       BKE_mesh_mirror_apply_mirror_on_axis(bmain, mesh, sd->symmetrize_direction, dist);
@@ -297,28 +309,34 @@ static void sculpt_init_session(Main *bmain, Depsgraph *depsgraph, Scene *scene,
   ob->sculpt = MEM_callocN(sizeof(SculptSession), "sculpt session");
   ob->sculpt->mode_type = OB_MODE_SCULPT;
 
-  BKE_sculpt_ensure_orig_mesh_data(scene, ob);
+  /* Trigger evaluation of modifier stack to ensure
+   * multires modifier sets .runtime.ccg in
+   * the evaluated mesh.
+   */
+  DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
 
   BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
 
   /* This function expects a fully evaluated depsgraph. */
   BKE_sculpt_update_object_for_edit(depsgraph, ob, false, false, false);
 
-  /* Here we can detect geometry that was just added to Sculpt Mode as it has the
-   * SCULPT_FACE_SET_NONE assigned, so we can create a new Face Set for it. */
-  /* In sculpt mode all geometry that is assigned to SCULPT_FACE_SET_NONE is considered as not
-   * initialized, which is used is some operators that modify the mesh topology to perform certain
-   * actions in the new polys. After these operations are finished, all polys should have a valid
-   * face set ID assigned (different from SCULPT_FACE_SET_NONE) to manage their visibility
-   * correctly. */
-  /* TODO(pablodp606): Based on this we can improve the UX in future tools for creating new
-   * objects, like moving the transform pivot position to the new area or masking existing
-   * geometry. */
   SculptSession *ss = ob->sculpt;
-  const int new_face_set = SCULPT_face_set_next_available_get(ss);
-  for (int i = 0; i < ss->totfaces; i++) {
-    if (ss->face_sets[i] == SCULPT_FACE_SET_NONE) {
-      ss->face_sets[i] = new_face_set;
+  if (ss->face_sets) {
+    /* Here we can detect geometry that was just added to Sculpt Mode as it has the
+     * SCULPT_FACE_SET_NONE assigned, so we can create a new Face Set for it. */
+    /* In sculpt mode all geometry that is assigned to SCULPT_FACE_SET_NONE is considered as not
+     * initialized, which is used is some operators that modify the mesh topology to perform
+     * certain actions in the new polys. After these operations are finished, all polys should have
+     * a valid face set ID assigned (different from SCULPT_FACE_SET_NONE) to manage their
+     * visibility correctly. */
+    /* TODO(pablodp606): Based on this we can improve the UX in future tools for creating new
+     * objects, like moving the transform pivot position to the new area or masking existing
+     * geometry. */
+    const int new_face_set = SCULPT_face_set_next_available_get(ss);
+    for (int i = 0; i < ss->totfaces; i++) {
+      if (ss->face_sets[i] == SCULPT_FACE_SET_NONE) {
+        ss->face_sets[i] = new_face_set;
+      }
     }
   }
 }
@@ -392,7 +410,7 @@ void ED_object_sculptmode_enter_ex(Main *bmain,
       bool has_undo = wm->undo_stack != NULL;
       /* Undo push is needed to prevent memory leak. */
       if (has_undo) {
-        SCULPT_undo_push_begin(ob, "Dynamic topology enable");
+        SCULPT_undo_push_begin_ex(ob, "Dynamic topology enable");
       }
       SCULPT_dynamic_topology_enable_ex(bmain, depsgraph, scene, ob);
       if (has_undo) {
@@ -416,7 +434,8 @@ void ED_object_sculptmode_enter(struct bContext *C, Depsgraph *depsgraph, Report
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   ED_object_sculptmode_enter_ex(bmain, depsgraph, scene, ob, false, reports);
 }
 
@@ -468,7 +487,8 @@ void ED_object_sculptmode_exit(bContext *C, Depsgraph *depsgraph)
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   ED_object_sculptmode_exit_ex(bmain, depsgraph, scene, ob);
 }
 
@@ -480,7 +500,8 @@ static int sculpt_mode_toggle_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   ToolSettings *ts = scene->toolsettings;
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   const int mode_flag = OB_MODE_SCULPT;
   const bool is_mode_set = (ob->mode & mode_flag) != 0;
 
@@ -508,7 +529,7 @@ static int sculpt_mode_toggle_exec(bContext *C, wmOperator *op)
          * while it works it causes lag when undoing the first undo step, see T71564. */
         wmWindowManager *wm = CTX_wm_manager(C);
         if (wm->op_undo_depth <= 1) {
-          SCULPT_undo_push_begin(ob, op->type->name);
+          SCULPT_undo_push_begin(ob, op);
           SCULPT_undo_push_end(ob);
         }
       }
@@ -543,7 +564,7 @@ void SCULPT_geometry_preview_lines_update(bContext *C, SculptSession *ss, float
   Depsgraph *depsgraph = CTX_data_depsgraph_pointer(C);
   Object *ob = CTX_data_active_object(C);
 
-  ss->preview_vert_index_count = 0;
+  ss->preview_vert_count = 0;
   int totpoints = 0;
 
   /* This function is called from the cursor drawing code, so the PBVH may not be build yet. */
@@ -568,193 +589,50 @@ void SCULPT_geometry_preview_lines_update(bContext *C, SculptSession *ss, float
   float brush_co[3];
   copy_v3_v3(brush_co, SCULPT_active_vertex_co_get(ss));
 
-  BLI_bitmap *visited_vertices = BLI_BITMAP_NEW(SCULPT_vertex_count_get(ss), "visited_vertices");
+  BLI_bitmap *visited_verts = BLI_BITMAP_NEW(SCULPT_vertex_count_get(ss), "visited_verts");
 
   /* Assuming an average of 6 edges per vertex in a triangulated mesh. */
-  const int max_preview_vertices = SCULPT_vertex_count_get(ss) * 3 * 2;
+  const int max_preview_verts = SCULPT_vertex_count_get(ss) * 3 * 2;
 
-  if (ss->preview_vert_index_list == NULL) {
-    ss->preview_vert_index_list = MEM_callocN(max_preview_vertices * sizeof(int), "preview lines");
+  if (ss->preview_vert_list == NULL) {
+    ss->preview_vert_list = MEM_callocN(max_preview_verts * sizeof(PBVHVertRef), "preview lines");
   }
 
-  GSQueue *not_visited_vertices = BLI_gsqueue_new(sizeof(int));
-  int active_v = SCULPT_active_vertex_get(ss);
-  BLI_gsqueue_push(not_visited_vertices, &active_v);
+  GSQueue *non_visited_verts = BLI_gsqueue_new(sizeof(PBVHVertRef));
+  PBVHVertRef active_v = SCULPT_active_vertex_get(ss);
+  BLI_gsqueue_push(non_visited_verts, &active_v);
+
+  while (!BLI_gsqueue_is_empty(non_visited_verts)) {
+    PBVHVertRef from_v;
 
-  while (!BLI_gsqueue_is_empty(not_visited_vertices)) {
-    int from_v;
-    BLI_gsqueue_pop(not_visited_vertices, &from_v);
+    BLI_gsqueue_pop(non_visited_verts, &from_v);
     SculptVertexNeighborIter ni;
     SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, from_v, ni) {
-      if (totpoints + (ni.size * 2) < max_preview_vertices) {
-        int to_v = ni.index;
-        ss->preview_vert_index_list[totpoints] = from_v;
+      if (totpoints + (ni.size * 2) < max_preview_verts) {
+        PBVHVertRef to_v = ni.vertex;
+        int to_v_i = ni.index;
+        ss->preview_vert_list[totpoints] = from_v;
         totpoints++;
-        ss->preview_vert_index_list[totpoints] = to_v;
+        ss->preview_vert_list[totpoints] = to_v;
         totpoints++;
-        if (BLI_BITMAP_TEST(visited_vertices, to_v)) {
+        if (BLI_BITMAP_TEST(visited_verts, to_v_i)) {
           continue;
         }
-        BLI_BITMAP_ENABLE(visited_vertices, to_v);
+        BLI_BITMAP_ENABLE(visited_verts, to_v_i);
         const float *co = SCULPT_vertex_co_for_grab_active_get(ss, to_v);
         if (len_squared_v3v3(brush_co, co) < radius * radius) {
-          BLI_gsqueue_push(not_visited_vertices, &to_v);
+          BLI_gsqueue_push(non_visited_verts, &to_v);
         }
       }
     }
     SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
   }
 
-  BLI_gsqueue_free(not_visited_vertices);
-
-  MEM_freeN(visited_vertices);
-
-  ss->preview_vert_index_count = totpoints;
-}
-
-static int vertex_to_loop_colors_exec(bContext *C, wmOperator *UNUSED(op))
-{
-  Object *ob = CTX_data_active_object(C);
-
-  ID *data;
-  data = ob->data;
-  if (data == NULL || ID_IS_LINKED(data) || ID_IS_OVERRIDE_LIBRARY(data)) {
-    return OPERATOR_CANCELLED;
-  }
-
-  if (ob->type != OB_MESH) {
-    return OPERATOR_CANCELLED;
-  }
-
-  Mesh *mesh = ob->data;
-
-  const int mloopcol_layer_n = CustomData_get_active_layer(&mesh->ldata, CD_PROP_BYTE_COLOR);
-  if (mloopcol_layer_n == -1) {
-    return OPERATOR_CANCELLED;
-  }
-  MLoopCol *loopcols = CustomData_get_layer_n(&mesh->ldata, CD_PROP_BYTE_COLOR, mloopcol_layer_n);
-
-  const int MPropCol_layer_n = CustomData_get_active_layer(&mesh->vdata, CD_PROP_COLOR);
-  if (MPropCol_layer_n == -1) {
-    return OPERATOR_CANCELLED;
-  }
-  const MPropCol *vertcols = CustomData_get_layer_n(&mesh->vdata, CD_PROP_COLOR, MPropCol_layer_n);
-
-  const MLoop *loops = CustomData_get_layer(&mesh->ldata, CD_MLOOP);
-  const MPoly *polys = CustomData_get_layer(&mesh->pdata, CD_MPOLY);
-
-  for (int i = 0; i < mesh->totpoly; i++) {
-    const MPoly *c_poly = &polys[i];
-    for (int j = 0; j < c_poly->totloop; j++) {
-      int loop_index = c_poly->loopstart + j;
-      const MLoop *c_loop = &loops[c_poly->loopstart + j];
-      float srgb_color[4];
-      linearrgb_to_srgb_v4(srgb_color, vertcols[c_loop->v].color);
-      loopcols[loop_index].r = (char)(srgb_color[0] * 255);
-      loopcols[loop_index].g = (char)(srgb_color[1] * 255);
-      loopcols[loop_index].b = (char)(srgb_color[2] * 255);
-      loopcols[loop_index].a = (char)(srgb_color[3] * 255);
-    }
-  }
-
-  DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
-  WM_event_add_notifier(C, NC_GEOM | ND_DATA, ob->data);
-
-  return OPERATOR_FINISHED;
-}
-
-static bool sculpt_colors_poll(bContext *C)
-{
-  if (!SCULPT_mode_poll(C)) {
-    return false;
-  }
-
-  Object *ob = CTX_data_active_object(C);
-
-  if (!ob->sculpt || !ob->sculpt->pbvh || BKE_pbvh_type(ob->sculpt->pbvh) != PBVH_FACES) {
-    return false;
-  }
-
-  return SCULPT_has_colors(ob->sculpt);
-}
-
-static void SCULPT_OT_vertex_to_loop_colors(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Sculpt Vertex Color to Vertex Color";
-  ot->description = "Copy the Sculpt Vertex Color to a regular color layer";
-  ot->idname = "SCULPT_OT_vertex_to_loop_colors";
-
-  /* api callbacks */
-  ot->poll = sculpt_colors_poll;
-  ot->exec = vertex_to_loop_colors_exec;
-
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
-}
-
-static int loop_to_vertex_colors_exec(bContext *C, wmOperator *UNUSED(op))
-{
-  Object *ob = CTX_data_active_object(C);
-
-  ID *data;
-  data = ob->data;
-  if (data == NULL || ID_IS_LINKED(data) || ID_IS_OVERRIDE_LIBRARY(data)) {
-    return OPERATOR_CANCELLED;
-  }
-
-  if (ob->type != OB_MESH) {
-    return OPERATOR_CANCELLED;
-  }
-
-  Mesh *mesh = ob->data;
-
-  const int mloopcol_layer_n = CustomData_get_active_layer(&mesh->ldata, CD_PROP_BYTE_COLOR);
-  if (mloopcol_layer_n == -1) {
-    return OPERATOR_CANCELLED;
-  }
-  const MLoopCol *loopcols = CustomData_get_layer_n(
-      &mesh->ldata, CD_PROP_BYTE_COLOR, mloopcol_layer_n);
-
-  const int MPropCol_layer_n = CustomData_get_active_layer(&mesh->vdata, CD_PROP_COLOR);
-  if (MPropCol_layer_n == -1) {
-    return OPERATOR_CANCELLED;
-  }
-  MPropCol *vertcols = CustomData_get_layer_n(&mesh->vdata, CD_PROP_COLOR, MPropCol_layer_n);
-
-  const MLoop *loops = CustomData_get_layer(&mesh->ldata, CD_MLOOP);
-  const MPoly *polys = CustomData_get_layer(&mesh->pdata, CD_MPOLY);
-
-  for (int i = 0; i < mesh->totpoly; i++) {
-    const MPoly *c_poly = &polys[i];
-    for (int j = 0; j < c_poly->totloop; j++) {
-      int loop_index = c_poly->loopstart + j;
-      const MLoop *c_loop = &loops[c_poly->loopstart + j];
-      vertcols[c_loop->v].color[0] = (loopcols[loop_index].r / 255.0f);
-      vertcols[c_loop->v].color[1] = (loopcols[loop_index].g / 255.0f);
-      vertcols[c_loop->v].color[2] = (loopcols[loop_index].b / 255.0f);
-      vertcols[c_loop->v].color[3] = (loopcols[loop_index].a / 255.0f);
-      srgb_to_linearrgb_v4(vertcols[c_loop->v].color, vertcols[c_loop->v].color);
-    }
-  }
-
-  DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
-  WM_event_add_notifier(C, NC_GEOM | ND_DATA, ob->data);
-
-  return OPERATOR_FINISHED;
-}
-
-static void SCULPT_OT_loop_to_vertex_colors(wmOperatorType *ot)
-{
-  /* identifiers */
-  ot->name = "Vertex Color to Sculpt Vertex Color";
-  ot->description = "Copy the active loop color layer to the vertex color";
-  ot->idname = "SCULPT_OT_loop_to_vertex_colors";
+  BLI_gsqueue_free(non_visited_verts);
 
-  /* api callbacks */
-  ot->poll = sculpt_colors_poll;
-  ot->exec = loop_to_vertex_colors_exec;
+  MEM_freeN(visited_verts);
 
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ss->preview_vert_count = totpoints;
 }
 
 static int sculpt_sample_color_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(e))
@@ -764,7 +642,7 @@ static int sculpt_sample_color_invoke(bContext *C, wmOperator *op, const wmEvent
   Object *ob = CTX_data_active_object(C);
   Brush *brush = BKE_paint_brush(&sd->paint);
   SculptSession *ss = ob->sculpt;
-  int active_vertex = SCULPT_active_vertex_get(ss);
+  PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
   float active_vertex_color[4];
 
   if (!SCULPT_handles_colors_report(ss, op->reports)) {
@@ -882,9 +760,6 @@ static void do_mask_by_color_contiguous_update_nodes_cb(
       continue;
     }
     update_node = true;
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
   if (update_node) {
@@ -893,8 +768,11 @@ static void do_mask_by_color_contiguous_update_nodes_cb(
 }
 
 static bool sculpt_mask_by_color_contiguous_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   MaskByColorContiguousFloodFillData *data = userdata;
   float current_color[4];
 
@@ -902,10 +780,10 @@ static bool sculpt_mask_by_color_contiguous_floodfill_cb(
 
   float new_vertex_mask = sculpt_mask_by_color_delta_get(
       current_color, data->initial_color, data->threshold, data->invert);
-  data->new_mask[to_v] = new_vertex_mask;
+  data->new_mask[to_v_i] = new_vertex_mask;
 
   if (is_duplicate) {
-    data->new_mask[to_v] = data->new_mask[from_v];
+    data->new_mask[to_v_i] = data->new_mask[from_v_i];
   }
 
   float len = len_v3v3(current_color, data->initial_color);
@@ -914,7 +792,7 @@ static bool sculpt_mask_by_color_contiguous_floodfill_cb(
 }
 
 static void sculpt_mask_by_color_contiguous(Object *object,
-                                            const int vertex,
+                                            const PBVHVertRef vertex,
                                             const float threshold,
                                             const bool invert,
                                             const bool preserve_mask)
@@ -991,7 +869,7 @@ static void do_mask_by_color_task_cb(void *__restrict userdata,
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
     float col[4];
-    SCULPT_vertex_color_get(ss, vd.index, col);
+    SCULPT_vertex_color_get(ss, vd.vertex, col);
 
     const float current_mask = *vd.mask;
     const float new_mask = sculpt_mask_by_color_delta_get(active_color, col, threshold, invert);
@@ -1001,18 +879,15 @@ static void do_mask_by_color_task_cb(void *__restrict userdata,
       continue;
     }
     update_node = true;
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
   }
   BKE_pbvh_vertex_iter_end;
   if (update_node) {
-    BKE_pbvh_node_mark_redraw(data->nodes[n]);
+    BKE_pbvh_node_mark_update_mask(data->nodes[n]);
   }
 }
 
 static void sculpt_mask_by_color_full_mesh(Object *object,
-                                           const int vertex,
+                                           const PBVHVertRef vertex,
                                            const float threshold,
                                            const bool invert,
                                            const bool preserve_mask)
@@ -1064,10 +939,10 @@ static int sculpt_mask_by_color_invoke(bContext *C, wmOperator *op, const wmEven
   const float mval_fl[2] = {UNPACK2(event->mval)};
   SCULPT_cursor_geometry_info_update(C, &sgi, mval_fl, false);
 
-  SCULPT_undo_push_begin(ob, "Mask by color");
+  SCULPT_undo_push_begin(ob, op);
   BKE_sculpt_color_layer_create_if_needed(ob);
 
-  const int active_vertex = SCULPT_active_vertex_get(ss);
+  const PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
   const float threshold = RNA_float_get(op->ptr, "threshold");
   const bool invert = RNA_boolean_get(op->ptr, "invert");
   const bool preserve_mask = RNA_boolean_get(op->ptr, "preserve_previous_mask");
@@ -1156,8 +1031,6 @@ void ED_operatortypes_sculpt(void)
   WM_operatortype_append(SCULPT_OT_project_line_gesture);
 
   WM_operatortype_append(SCULPT_OT_sample_color);
-  WM_operatortype_append(SCULPT_OT_loop_to_vertex_colors);
-  WM_operatortype_append(SCULPT_OT_vertex_to_loop_colors);
   WM_operatortype_append(SCULPT_OT_color_filter);
   WM_operatortype_append(SCULPT_OT_mask_by_color);
   WM_operatortype_append(SCULPT_OT_dyntopo_detail_size_edit);
diff --git a/source/blender/editors/sculpt_paint/sculpt_paint_color.c b/source/blender/editors/sculpt_paint/sculpt_paint_color.c
index 7e813590e21..c494c71f1eb 100644
--- a/source/blender/editors/sculpt_paint/sculpt_paint_color.c
+++ b/source/blender/editors/sculpt_paint/sculpt_paint_color.c
@@ -17,6 +17,7 @@
 #include "DNA_meshdata_types.h"
 
 #include "BKE_brush.h"
+#include "BKE_colorband.h"
 #include "BKE_colortools.h"
 #include "BKE_context.h"
 #include "BKE_mesh.h"
@@ -80,20 +81,16 @@ static void do_color_smooth_task_cb_exec(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float smooth_color[4];
-    SCULPT_neighbor_color_average(ss, smooth_color, vd.index);
+    SCULPT_neighbor_color_average(ss, smooth_color, vd.vertex);
     float col[4];
 
-    SCULPT_vertex_color_get(ss, vd.index, col);
+    SCULPT_vertex_color_get(ss, vd.vertex, col);
     blend_color_interpolate_float(col, col, smooth_color, fade);
-    SCULPT_vertex_color_set(ss, vd.index, col);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
+    SCULPT_vertex_color_set(ss, vd.vertex, col);
   }
   BKE_pbvh_vertex_iter_end;
 }
@@ -121,11 +118,31 @@ static void do_paint_brush_task_cb_ex(void *__restrict userdata,
   const int thread_id = BLI_task_parallel_thread_id(tls);
 
   float brush_color[4] = {0.0f, 0.0f, 0.0f, 1.0f};
+
   copy_v3_v3(brush_color,
              ss->cache->invert ? BKE_brush_secondary_color_get(ss->scene, brush) :
                                  BKE_brush_color_get(ss->scene, brush));
+
   IMB_colormanagement_srgb_to_scene_linear_v3(brush_color, brush_color);
 
+  if (brush->flag & BRUSH_USE_GRADIENT) {
+    switch (brush->gradient_stroke_mode) {
+      case BRUSH_GRADIENT_PRESSURE:
+        BKE_colorband_evaluate(brush->gradient, ss->cache->pressure, brush_color);
+        break;
+      case BRUSH_GRADIENT_SPACING_REPEAT: {
+        float coord = fmod(ss->cache->stroke_distance / brush->gradient_spacing, 1.0);
+        BKE_colorband_evaluate(brush->gradient, coord, brush_color);
+        break;
+      }
+      case BRUSH_GRADIENT_SPACING_CLAMP: {
+        BKE_colorband_evaluate(
+            brush->gradient, ss->cache->stroke_distance / brush->gradient_spacing, brush_color);
+        break;
+      }
+    }
+  }
+
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
     SCULPT_orig_vert_data_update(&orig_data, &vd);
 
@@ -151,7 +168,7 @@ static void do_paint_brush_task_cb_ex(void *__restrict userdata,
                                                           vd.no,
                                                           vd.fno,
                                                           vd.mask ? *vd.mask : 0.0f,
-                                                          vd.index,
+                                                          vd.vertex,
                                                           thread_id);
 
     /* Density. */
@@ -182,14 +199,10 @@ static void do_paint_brush_task_cb_ex(void *__restrict userdata,
     mul_v4_v4fl(buffer_color, color_buffer->color[vd.i], brush->alpha);
 
     float col[4];
-    SCULPT_vertex_color_get(ss, vd.index, col);
+    SCULPT_vertex_color_get(ss, vd.vertex, col);
     IMB_blend_color_float(col, orig_data.col, buffer_color, brush->blend);
     CLAMP4(col, 0.0f, 1.0f);
-    SCULPT_vertex_color_set(ss, vd.index, col);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
+    SCULPT_vertex_color_set(ss, vd.vertex, col);
   }
   BKE_pbvh_vertex_iter_end;
 }
@@ -221,7 +234,7 @@ static void do_sample_wet_paint_task_cb(void *__restrict userdata,
     }
 
     float col[4];
-    SCULPT_vertex_color_get(ss, vd.index, col);
+    SCULPT_vertex_color_get(ss, vd.vertex, col);
 
     add_v4_v4(swptd->color, col);
     swptd->tot_samples++;
@@ -400,7 +413,7 @@ static void do_smear_brush_task_cb_exec(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float current_disp[3];
@@ -409,7 +422,7 @@ static void do_smear_brush_task_cb_exec(void *__restrict userdata,
     copy_v4_v4(interp_color, ss->cache->prev_colors[vd.index]);
 
     float no[3];
-    SCULPT_vertex_normal_get(ss, vd.index, no);
+    SCULPT_vertex_normal_get(ss, vd.vertex, no);
 
     switch (brush->smear_deform_type) {
       case BRUSH_SMEAR_DEFORM_DRAG:
@@ -442,11 +455,11 @@ static void do_smear_brush_task_cb_exec(void *__restrict userdata,
      */
 
     SculptVertexNeighborIter ni2;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni2) {
-      const float *nco = SCULPT_vertex_co_get(ss, ni2.index);
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni2) {
+      const float *nco = SCULPT_vertex_co_get(ss, ni2.vertex);
 
       SculptVertexNeighborIter ni;
-      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, ni2.index, ni) {
+      SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, ni2.vertex, ni) {
         if (ni.index == vd.index) {
           continue;
         }
@@ -454,13 +467,13 @@ static void do_smear_brush_task_cb_exec(void *__restrict userdata,
         float vertex_disp[3];
         float vertex_disp_norm[3];
 
-        sub_v3_v3v3(vertex_disp, SCULPT_vertex_co_get(ss, ni.index), vd.co);
+        sub_v3_v3v3(vertex_disp, SCULPT_vertex_co_get(ss, ni.vertex), vd.co);
 
         /* Weight by how close we are to our target distance from vd.co. */
         float w = (1.0f + fabsf(len_v3(vertex_disp) / bstrength - 1.0f));
 
         /* TODO: use cotangents (or at least face areas) here. */
-        float len = len_v3v3(SCULPT_vertex_co_get(ss, ni.index), nco);
+        float len = len_v3v3(SCULPT_vertex_co_get(ss, ni.vertex), nco);
         if (len > 0.0f) {
           len = bstrength / len;
         }
@@ -502,13 +515,9 @@ static void do_smear_brush_task_cb_exec(void *__restrict userdata,
     blend_color_mix_float(interp_color, interp_color, accum);
 
     float col[4];
-    SCULPT_vertex_color_get(ss, vd.index, col);
+    SCULPT_vertex_color_get(ss, vd.vertex, col);
     blend_color_interpolate_float(col, ss->cache->prev_colors[vd.index], interp_color, fade);
-    SCULPT_vertex_color_set(ss, vd.index, col);
-
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
-    }
+    SCULPT_vertex_color_set(ss, vd.vertex, col);
   }
   BKE_pbvh_vertex_iter_end;
 }
@@ -522,7 +531,7 @@ static void do_smear_store_prev_colors_task_cb_exec(void *__restrict userdata,
 
   PBVHVertexIter vd;
   BKE_pbvh_vertex_iter_begin (ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE) {
-    SCULPT_vertex_color_get(ss, vd.index, ss->cache->prev_colors[vd.index]);
+    SCULPT_vertex_color_get(ss, vd.vertex, ss->cache->prev_colors[vd.index]);
   }
   BKE_pbvh_vertex_iter_end;
 }
@@ -541,7 +550,9 @@ void SCULPT_do_smear_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode
   if (!ss->cache->prev_colors) {
     ss->cache->prev_colors = MEM_callocN(sizeof(float[4]) * totvert, "prev colors");
     for (int i = 0; i < totvert; i++) {
-      SCULPT_vertex_color_get(ss, i, ss->cache->prev_colors[i]);
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+      SCULPT_vertex_color_get(ss, vertex, ss->cache->prev_colors[i]);
     }
   }
 
diff --git a/source/blender/editors/sculpt_paint/sculpt_paint_image.cc b/source/blender/editors/sculpt_paint/sculpt_paint_image.cc
index 975a8f21aaf..8a3a3fe7adc 100644
--- a/source/blender/editors/sculpt_paint/sculpt_paint_image.cc
+++ b/source/blender/editors/sculpt_paint/sculpt_paint_image.cc
@@ -172,7 +172,15 @@ template<typename ImageBuffer> class PaintingKernel {
       const float3 face_normal(0.0f, 0.0f, 0.0f);
       const float mask = 0.0f;
       const float falloff_strength = SCULPT_brush_strength_factor(
-          ss, brush, pixel_pos, sqrtf(test.dist), normal, face_normal, mask, 0, thread_id);
+          ss,
+          brush,
+          pixel_pos,
+          sqrtf(test.dist),
+          normal,
+          face_normal,
+          mask,
+          BKE_pbvh_make_vref(PBVH_REF_NONE),
+          thread_id);
       float4 paint_color = brush_color * falloff_strength * brush_strength;
       float4 buffer_color;
       blend_color_mix_float(buffer_color, color, paint_color);
@@ -383,7 +391,7 @@ static void push_undo(const NodeData &node_data,
       continue;
     }
     int tilex, tiley, tilew, tileh;
-    ListBase *undo_tiles = ED_image_paint_tile_list_get();
+    PaintTileMap *undo_tiles = ED_image_paint_tile_map_get();
     undo_region_tiles(&image_buffer,
                       tile_undo.region.xmin,
                       tile_undo.region.ymin,
diff --git a/source/blender/editors/sculpt_paint/sculpt_pose.c b/source/blender/editors/sculpt_paint/sculpt_pose.c
index 479ed43c6bf..d1418c8dc35 100644
--- a/source/blender/editors/sculpt_paint/sculpt_pose.c
+++ b/source/blender/editors/sculpt_paint/sculpt_pose.c
@@ -182,7 +182,7 @@ static void do_pose_brush_task_cb_ex(void *__restrict userdata,
 
       /* Apply the vertex mask to the displacement. */
       const float mask = vd.mask ? 1.0f - *vd.mask : 1.0f;
-      const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.index);
+      const float automask = SCULPT_automasking_factor_get(ss->cache->automasking, ss, vd.vertex);
       mul_v3_fl(disp, mask * automask);
 
       /* Accumulate the displacement. */
@@ -196,7 +196,7 @@ static void do_pose_brush_task_cb_ex(void *__restrict userdata,
     copy_v3_v3(target_co, final_pos);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -221,7 +221,7 @@ static void pose_brush_grow_factor_task_cb_ex(void *__restrict userdata,
     float max = 0.0f;
 
     /* Grow the factor. */
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
       float vmask_f = data->prev_mask[ni.index];
       max = MAX2(vmask_f, max);
     }
@@ -367,7 +367,7 @@ typedef struct PoseFloodFillData {
   int current_face_set;
   int next_face_set;
   int prev_face_set;
-  int next_vertex;
+  PBVHVertRef next_vertex;
 
   bool next_face_set_found;
 
@@ -397,14 +397,19 @@ typedef struct PoseFloodFillData {
   int target_face_set;
 } PoseFloodFillData;
 
-static bool pose_topology_floodfill_cb(
-    SculptSession *ss, int UNUSED(from_v), int to_v, bool is_duplicate, void *userdata)
+static bool pose_topology_floodfill_cb(SculptSession *ss,
+                                       PBVHVertRef UNUSED(from_v),
+                                       PBVHVertRef to_v,
+                                       bool is_duplicate,
+                                       void *userdata)
 {
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   PoseFloodFillData *data = userdata;
   const float *co = SCULPT_vertex_co_get(ss, to_v);
 
   if (data->pose_factor) {
-    data->pose_factor[to_v] = 1.0f;
+    data->pose_factor[to_v_i] = 1.0f;
   }
 
   if (len_squared_v3v3(data->pose_initial_co, data->fallback_floodfill_origin) <
@@ -426,15 +431,19 @@ static bool pose_topology_floodfill_cb(
   return false;
 }
 
-static bool pose_face_sets_floodfill_cb(
-    SculptSession *ss, int UNUSED(from_v), int to_v, bool is_duplicate, void *userdata)
+static bool pose_face_sets_floodfill_cb(SculptSession *ss,
+                                        PBVHVertRef UNUSED(from_v),
+                                        PBVHVertRef to_v,
+                                        bool is_duplicate,
+                                        void *userdata)
 {
   PoseFloodFillData *data = userdata;
 
-  const int index = to_v;
+  const int index = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+  const PBVHVertRef vertex = to_v;
   bool visit_next = false;
 
-  const float *co = SCULPT_vertex_co_get(ss, index);
+  const float *co = SCULPT_vertex_co_get(ss, vertex);
   const bool symmetry_check = SCULPT_check_vertex_pivot_symmetry(
                                   co, data->pose_initial_co, data->symm) &&
                               !is_duplicate;
@@ -448,11 +457,11 @@ static bool pose_face_sets_floodfill_cb(
 
     if (sculpt_pose_brush_is_vertex_inside_brush_radius(
             co, data->pose_initial_co, data->radius, data->symm)) {
-      const int visited_face_set = SCULPT_vertex_face_set_get(ss, index);
+      const int visited_face_set = SCULPT_vertex_face_set_get(ss, vertex);
       BLI_gset_add(data->visited_face_sets, POINTER_FROM_INT(visited_face_set));
     }
     else if (symmetry_check) {
-      data->current_face_set = SCULPT_vertex_face_set_get(ss, index);
+      data->current_face_set = SCULPT_vertex_face_set_get(ss, vertex);
       BLI_gset_add(data->visited_face_sets, POINTER_FROM_INT(data->current_face_set));
     }
     return true;
@@ -466,11 +475,11 @@ static bool pose_face_sets_floodfill_cb(
     GSetIterator gs_iter;
     GSET_ITER (gs_iter, data->visited_face_sets) {
       const int visited_face_set = POINTER_AS_INT(BLI_gsetIterator_getKey(&gs_iter));
-      is_vertex_valid |= SCULPT_vertex_has_face_set(ss, index, visited_face_set);
+      is_vertex_valid |= SCULPT_vertex_has_face_set(ss, vertex, visited_face_set);
     }
   }
   else {
-    is_vertex_valid = SCULPT_vertex_has_face_set(ss, index, data->current_face_set);
+    is_vertex_valid = SCULPT_vertex_has_face_set(ss, vertex, data->current_face_set);
   }
 
   if (!is_vertex_valid) {
@@ -485,11 +494,11 @@ static bool pose_face_sets_floodfill_cb(
 
   /* Fallback origin accumulation. */
   if (symmetry_check) {
-    add_v3_v3(data->fallback_origin, SCULPT_vertex_co_get(ss, index));
+    add_v3_v3(data->fallback_origin, SCULPT_vertex_co_get(ss, vertex));
     data->fallback_count++;
   }
 
-  if (!symmetry_check || SCULPT_vertex_has_unique_face_set(ss, index)) {
+  if (!symmetry_check || SCULPT_vertex_has_unique_face_set(ss, vertex)) {
     return visit_next;
   }
 
@@ -498,15 +507,15 @@ static bool pose_face_sets_floodfill_cb(
   bool count_as_boundary = false;
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, index, ni) {
-    int next_face_set_candidate = SCULPT_vertex_face_set_get(ss, ni.index);
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
+    int next_face_set_candidate = SCULPT_vertex_face_set_get(ss, ni.vertex);
 
     /* Check if we can get a valid face set for the next iteration from this neighbor. */
-    if (SCULPT_vertex_has_unique_face_set(ss, ni.index) &&
+    if (SCULPT_vertex_has_unique_face_set(ss, ni.vertex) &&
         !BLI_gset_haskey(data->visited_face_sets, POINTER_FROM_INT(next_face_set_candidate))) {
       if (!data->next_face_set_found) {
         data->next_face_set = next_face_set_candidate;
-        data->next_vertex = ni.index;
+        data->next_vertex = ni.vertex;
         data->next_face_set_found = true;
       }
       count_as_boundary = true;
@@ -516,7 +525,7 @@ static bool pose_face_sets_floodfill_cb(
 
   /* Origin accumulation. */
   if (count_as_boundary) {
-    add_v3_v3(data->pose_origin, SCULPT_vertex_co_get(ss, index));
+    add_v3_v3(data->pose_origin, SCULPT_vertex_co_get(ss, vertex));
     data->tot_co++;
   }
   return visit_next;
@@ -585,7 +594,7 @@ static void pose_brush_init_task_cb_ex(void *__restrict userdata,
     SculptVertexNeighborIter ni;
     float avg = 0.0f;
     int total = 0;
-    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.index, ni) {
+    SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vd.vertex, ni) {
       avg += data->pose_factor[ni.index];
       total++;
     }
@@ -660,7 +669,8 @@ static SculptPoseIKChain *pose_ik_chain_init_topology(Sculpt *sd,
   float next_chain_segment_target[3];
 
   int totvert = SCULPT_vertex_count_get(ss);
-  int nearest_vertex_index = SCULPT_nearest_vertex_get(sd, ob, initial_location, FLT_MAX, true);
+  PBVHVertRef nearest_vertex = SCULPT_nearest_vertex_get(sd, ob, initial_location, FLT_MAX, true);
+  int nearest_vertex_index = BKE_pbvh_vertex_to_index(ss->pbvh, nearest_vertex);
 
   /* Init the buffers used to keep track of the changes in the pose factors as more segments are
    * added to the IK chain. */
@@ -745,7 +755,7 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets(
   int current_face_set = SCULPT_FACE_SET_NONE;
   int prev_face_set = SCULPT_FACE_SET_NONE;
 
-  int current_vertex = SCULPT_active_vertex_get(ss);
+  PBVHVertRef current_vertex = SCULPT_active_vertex_get(ss);
 
   for (int s = 0; s < ik_chain->tot_segments; s++) {
 
@@ -801,15 +811,18 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets(
 }
 
 static bool pose_face_sets_fk_find_masked_floodfill_cb(
-    SculptSession *ss, int from_v, int to_v, bool is_duplicate, void *userdata)
+    SculptSession *ss, PBVHVertRef from_v, PBVHVertRef to_v, bool is_duplicate, void *userdata)
 {
   PoseFloodFillData *data = userdata;
 
+  int from_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, from_v);
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
   if (!is_duplicate) {
-    data->floodfill_it[to_v] = data->floodfill_it[from_v] + 1;
+    data->floodfill_it[to_v_i] = data->floodfill_it[from_v_i] + 1;
   }
   else {
-    data->floodfill_it[to_v] = data->floodfill_it[from_v];
+    data->floodfill_it[to_v_i] = data->floodfill_it[from_v_i];
   }
 
   const int to_face_set = SCULPT_vertex_face_set_get(ss, to_v);
@@ -820,9 +833,9 @@ static bool pose_face_sets_fk_find_masked_floodfill_cb(
 
       BLI_gset_add(data->visited_face_sets, POINTER_FROM_INT(to_face_set));
 
-      if (data->floodfill_it[to_v] >= data->masked_face_set_it) {
+      if (data->floodfill_it[to_v_i] >= data->masked_face_set_it) {
         data->masked_face_set = to_face_set;
-        data->masked_face_set_it = data->floodfill_it[to_v];
+        data->masked_face_set_it = data->floodfill_it[to_v_i];
       }
 
       if (data->target_face_set == SCULPT_FACE_SET_NONE) {
@@ -834,11 +847,17 @@ static bool pose_face_sets_fk_find_masked_floodfill_cb(
   return SCULPT_vertex_has_face_set(ss, to_v, data->initial_face_set);
 }
 
-static bool pose_face_sets_fk_set_weights_floodfill_cb(
-    SculptSession *ss, int UNUSED(from_v), int to_v, bool UNUSED(is_duplicate), void *userdata)
+static bool pose_face_sets_fk_set_weights_floodfill_cb(SculptSession *ss,
+                                                       PBVHVertRef UNUSED(from_v),
+                                                       PBVHVertRef to_v,
+                                                       bool UNUSED(is_duplicate),
+                                                       void *userdata)
 {
   PoseFloodFillData *data = userdata;
-  data->fk_weights[to_v] = 1.0f;
+
+  int to_v_i = BKE_pbvh_vertex_to_index(ss->pbvh, to_v);
+
+  data->fk_weights[to_v_i] = 1.0f;
   return !SCULPT_vertex_has_face_set(ss, to_v, data->masked_face_set);
 }
 
@@ -849,7 +868,9 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets_fk(
 
   SculptPoseIKChain *ik_chain = pose_ik_chain_new(1, totvert);
 
-  const int active_vertex = SCULPT_active_vertex_get(ss);
+  const PBVHVertRef active_vertex = SCULPT_active_vertex_get(ss);
+  int active_vertex_index = BKE_pbvh_vertex_to_index(ss->pbvh, active_vertex);
+
   const int active_face_set = SCULPT_active_face_set_get(ss);
 
   SculptFloodFill flood;
@@ -857,7 +878,7 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets_fk(
   SCULPT_floodfill_add_initial(&flood, active_vertex);
   PoseFloodFillData fdata;
   fdata.floodfill_it = MEM_calloc_arrayN(totvert, sizeof(int), "floodfill iteration");
-  fdata.floodfill_it[active_vertex] = 1;
+  fdata.floodfill_it[active_vertex_index] = 1;
   fdata.initial_face_set = active_face_set;
   fdata.masked_face_set = SCULPT_FACE_SET_NONE;
   fdata.target_face_set = SCULPT_FACE_SET_NONE;
@@ -870,9 +891,12 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets_fk(
   int origin_count = 0;
   float origin_acc[3] = {0.0f};
   for (int i = 0; i < totvert; i++) {
-    if (fdata.floodfill_it[i] != 0 && SCULPT_vertex_has_face_set(ss, i, fdata.initial_face_set) &&
-        SCULPT_vertex_has_face_set(ss, i, fdata.masked_face_set)) {
-      add_v3_v3(origin_acc, SCULPT_vertex_co_get(ss, i));
+    PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
+    if (fdata.floodfill_it[i] != 0 &&
+        SCULPT_vertex_has_face_set(ss, vertex, fdata.initial_face_set) &&
+        SCULPT_vertex_has_face_set(ss, vertex, fdata.masked_face_set)) {
+      add_v3_v3(origin_acc, SCULPT_vertex_co_get(ss, vertex));
       origin_count++;
     }
   }
@@ -881,10 +905,12 @@ static SculptPoseIKChain *pose_ik_chain_init_face_sets_fk(
   float target_acc[3] = {0.0f};
   if (fdata.target_face_set != fdata.masked_face_set) {
     for (int i = 0; i < totvert; i++) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
       if (fdata.floodfill_it[i] != 0 &&
-          SCULPT_vertex_has_face_set(ss, i, fdata.initial_face_set) &&
-          SCULPT_vertex_has_face_set(ss, i, fdata.target_face_set)) {
-        add_v3_v3(target_acc, SCULPT_vertex_co_get(ss, i));
+          SCULPT_vertex_has_face_set(ss, vertex, fdata.initial_face_set) &&
+          SCULPT_vertex_has_face_set(ss, vertex, fdata.target_face_set)) {
+        add_v3_v3(target_acc, SCULPT_vertex_co_get(ss, vertex));
         target_count++;
       }
     }
diff --git a/source/blender/editors/sculpt_paint/sculpt_smooth.c b/source/blender/editors/sculpt_paint/sculpt_smooth.c
index c31863d892f..2ef3c28ba0c 100644
--- a/source/blender/editors/sculpt_paint/sculpt_smooth.c
+++ b/source/blender/editors/sculpt_paint/sculpt_smooth.c
@@ -46,26 +46,28 @@
 #include <math.h>
 #include <stdlib.h>
 
-void SCULPT_neighbor_coords_average_interior(SculptSession *ss, float result[3], int index)
+void SCULPT_neighbor_coords_average_interior(SculptSession *ss,
+                                             float result[3],
+                                             PBVHVertRef vertex)
 {
   float avg[3] = {0.0f, 0.0f, 0.0f};
   int total = 0;
   int neighbor_count = 0;
-  const bool is_boundary = SCULPT_vertex_is_boundary(ss, index);
+  const bool is_boundary = SCULPT_vertex_is_boundary(ss, vertex);
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, index, ni) {
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
     neighbor_count++;
     if (is_boundary) {
       /* Boundary vertices use only other boundary vertices. */
-      if (SCULPT_vertex_is_boundary(ss, ni.index)) {
-        add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.index));
+      if (SCULPT_vertex_is_boundary(ss, ni.vertex)) {
+        add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.vertex));
         total++;
       }
     }
     else {
       /* Interior vertices use all neighbors. */
-      add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.index));
+      add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.vertex));
       total++;
     }
   }
@@ -73,13 +75,13 @@ void SCULPT_neighbor_coords_average_interior(SculptSession *ss, float result[3],
 
   /* Do not modify corner vertices. */
   if (neighbor_count <= 2 && is_boundary) {
-    copy_v3_v3(result, SCULPT_vertex_co_get(ss, index));
+    copy_v3_v3(result, SCULPT_vertex_co_get(ss, vertex));
     return;
   }
 
   /* Avoid division by 0 when there are no neighbors. */
   if (total == 0) {
-    copy_v3_v3(result, SCULPT_vertex_co_get(ss, index));
+    copy_v3_v3(result, SCULPT_vertex_co_get(ss, vertex));
     return;
   }
 
@@ -134,14 +136,14 @@ void SCULPT_bmesh_four_neighbor_average(float avg[3], float direction[3], BMVert
 /* Generic functions for laplacian smoothing. These functions do not take boundary vertices into
  * account. */
 
-void SCULPT_neighbor_coords_average(SculptSession *ss, float result[3], int index)
+void SCULPT_neighbor_coords_average(SculptSession *ss, float result[3], PBVHVertRef vertex)
 {
   float avg[3] = {0.0f, 0.0f, 0.0f};
   int total = 0;
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, index, ni) {
-    add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.index));
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
+    add_v3_v3(avg, SCULPT_vertex_co_get(ss, ni.vertex));
     total++;
   }
   SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
@@ -150,18 +152,18 @@ void SCULPT_neighbor_coords_average(SculptSession *ss, float result[3], int inde
     mul_v3_v3fl(result, avg, 1.0f / total);
   }
   else {
-    copy_v3_v3(result, SCULPT_vertex_co_get(ss, index));
+    copy_v3_v3(result, SCULPT_vertex_co_get(ss, vertex));
   }
 }
 
-float SCULPT_neighbor_mask_average(SculptSession *ss, int index)
+float SCULPT_neighbor_mask_average(SculptSession *ss, PBVHVertRef vertex)
 {
   float avg = 0.0f;
   int total = 0;
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, index, ni) {
-    avg += SCULPT_vertex_mask_get(ss, ni.index);
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
+    avg += SCULPT_vertex_mask_get(ss, ni.vertex);
     total++;
   }
   SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
@@ -169,19 +171,19 @@ float SCULPT_neighbor_mask_average(SculptSession *ss, int index)
   if (total > 0) {
     return avg / total;
   }
-  return SCULPT_vertex_mask_get(ss, index);
+  return SCULPT_vertex_mask_get(ss, vertex);
 }
 
-void SCULPT_neighbor_color_average(SculptSession *ss, float result[4], int index)
+void SCULPT_neighbor_color_average(SculptSession *ss, float result[4], PBVHVertRef vertex)
 {
   float avg[4] = {0.0f, 0.0f, 0.0f, 0.0f};
   int total = 0;
 
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, index, ni) {
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
     float tmp[4] = {0};
 
-    SCULPT_vertex_color_get(ss, ni.index, tmp);
+    SCULPT_vertex_color_get(ss, ni.vertex, tmp);
 
     add_v4_v4(avg, tmp);
     total++;
@@ -192,7 +194,7 @@ void SCULPT_neighbor_color_average(SculptSession *ss, float result[4], int index
     mul_v4_v4fl(result, avg, 1.0f / total);
   }
   else {
-    SCULPT_vertex_color_get(ss, index, result);
+    SCULPT_vertex_color_get(ss, vertex, result);
   }
 }
 
@@ -227,7 +229,7 @@ static void do_enhance_details_brush_task_cb_ex(void *__restrict userdata,
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float disp[3];
@@ -235,7 +237,7 @@ static void do_enhance_details_brush_task_cb_ex(void *__restrict userdata,
     SCULPT_clip(sd, ss, vd.co, disp);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -258,9 +260,11 @@ static void SCULPT_enhance_details_brush(Sculpt *sd,
         totvert, sizeof(float[3]), "details directions");
 
     for (int i = 0; i < totvert; i++) {
+      PBVHVertRef vertex = BKE_pbvh_index_to_vertex(ss->pbvh, i);
+
       float avg[3];
-      SCULPT_neighbor_coords_average(ss, avg, i);
-      sub_v3_v3v3(ss->cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, i));
+      SCULPT_neighbor_coords_average(ss, avg, vertex);
+      sub_v3_v3v3(ss->cache->detail_directions[i], avg, SCULPT_vertex_co_get(ss, vertex));
     }
   }
 
@@ -309,23 +313,23 @@ static void do_smooth_brush_task_cb_ex(void *__restrict userdata,
                                        vd.no,
                                        vd.fno,
                                        smooth_mask ? 0.0f : (vd.mask ? *vd.mask : 0.0f),
-                                       vd.index,
+                                       vd.vertex,
                                        thread_id);
     if (smooth_mask) {
-      float val = SCULPT_neighbor_mask_average(ss, vd.index) - *vd.mask;
+      float val = SCULPT_neighbor_mask_average(ss, vd.vertex) - *vd.mask;
       val *= fade * bstrength;
       *vd.mask += val;
       CLAMP(*vd.mask, 0.0f, 1.0f);
     }
     else {
       float avg[3], val[3];
-      SCULPT_neighbor_coords_average_interior(ss, avg, vd.index);
+      SCULPT_neighbor_coords_average_interior(ss, avg, vd.vertex);
       sub_v3_v3v3(val, avg, vd.co);
       madd_v3_v3v3fl(val, vd.co, val, fade);
       SCULPT_clip(sd, ss, vd.co, val);
-    }
-    if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      if (vd.mvert) {
+        BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
+      }
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -403,13 +407,15 @@ void SCULPT_surface_smooth_laplacian_step(SculptSession *ss,
                                           float *disp,
                                           const float co[3],
                                           float (*laplacian_disp)[3],
-                                          const int v_index,
+                                          const PBVHVertRef vertex,
                                           const float origco[3],
                                           const float alpha)
 {
   float laplacian_smooth_co[3];
   float weigthed_o[3], weigthed_q[3], d[3];
-  SCULPT_neighbor_coords_average(ss, laplacian_smooth_co, v_index);
+  int v_index = BKE_pbvh_vertex_to_index(ss->pbvh, vertex);
+
+  SCULPT_neighbor_coords_average(ss, laplacian_smooth_co, vertex);
 
   mul_v3_v3fl(weigthed_o, origco, alpha);
   mul_v3_v3fl(weigthed_q, co, 1.0f - alpha);
@@ -422,7 +428,7 @@ void SCULPT_surface_smooth_laplacian_step(SculptSession *ss,
 void SCULPT_surface_smooth_displace_step(SculptSession *ss,
                                          float *co,
                                          float (*laplacian_disp)[3],
-                                         const int v_index,
+                                         const PBVHVertRef vertex,
                                          const float beta,
                                          const float fade)
 {
@@ -430,12 +436,15 @@ void SCULPT_surface_smooth_displace_step(SculptSession *ss,
   float b_current_vertex[3];
   int total = 0;
   SculptVertexNeighborIter ni;
-  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, v_index, ni) {
+  SCULPT_VERTEX_NEIGHBORS_ITER_BEGIN (ss, vertex, ni) {
     add_v3_v3(b_avg, laplacian_disp[ni.index]);
     total++;
   }
+
   SCULPT_VERTEX_NEIGHBORS_ITER_END(ni);
   if (total > 0) {
+    int v_index = BKE_pbvh_vertex_to_index(ss->pbvh, vertex);
+
     mul_v3_v3fl(b_current_vertex, b_avg, (1.0f - beta) / total);
     madd_v3_v3fl(b_current_vertex, laplacian_disp[v_index], beta);
     mul_v3_fl(b_current_vertex, clamp_f(fade, 0.0f, 1.0f));
@@ -474,15 +483,15 @@ static void SCULPT_do_surface_smooth_brush_laplacian_task_cb_ex(
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
 
     float disp[3];
     SCULPT_surface_smooth_laplacian_step(
-        ss, disp, vd.co, ss->cache->surface_smooth_laplacian_disp, vd.index, orig_data.co, alpha);
+        ss, disp, vd.co, ss->cache->surface_smooth_laplacian_disp, vd.vertex, orig_data.co, alpha);
     madd_v3_v3fl(vd.co, disp, clamp_f(fade, 0.0f, 1.0f));
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -515,10 +524,10 @@ static void SCULPT_do_surface_smooth_brush_displace_task_cb_ex(
                                                                 vd.no,
                                                                 vd.fno,
                                                                 vd.mask ? *vd.mask : 0.0f,
-                                                                vd.index,
+                                                                vd.vertex,
                                                                 thread_id);
     SCULPT_surface_smooth_displace_step(
-        ss, vd.co, ss->cache->surface_smooth_laplacian_disp, vd.index, beta, fade);
+        ss, vd.co, ss->cache->surface_smooth_laplacian_disp, vd.vertex, beta, fade);
   }
   BKE_pbvh_vertex_iter_end;
 }
diff --git a/source/blender/editors/sculpt_paint/sculpt_transform.c b/source/blender/editors/sculpt_paint/sculpt_transform.c
index 365000ab163..dfaa0bd4daa 100644
--- a/source/blender/editors/sculpt_paint/sculpt_transform.c
+++ b/source/blender/editors/sculpt_paint/sculpt_transform.c
@@ -46,7 +46,7 @@
 #include <math.h>
 #include <stdlib.h>
 
-void ED_sculpt_init_transform(struct bContext *C, Object *ob)
+void ED_sculpt_init_transform(struct bContext *C, Object *ob, const char *undo_name)
 {
   Sculpt *sd = CTX_data_tool_settings(C)->sculpt;
   SculptSession *ss = ob->sculpt;
@@ -60,7 +60,7 @@ void ED_sculpt_init_transform(struct bContext *C, Object *ob)
   copy_v4_v4(ss->prev_pivot_rot, ss->pivot_rot);
   copy_v3_v3(ss->prev_pivot_scale, ss->pivot_scale);
 
-  SCULPT_undo_push_begin(ob, "Transform");
+  SCULPT_undo_push_begin_ex(ob, undo_name);
   BKE_sculpt_update_object_for_edit(depsgraph, ob, false, false, false);
 
   ss->pivot_rot[3] = 1.0f;
@@ -179,7 +179,7 @@ static void sculpt_transform_task_cb(void *__restrict userdata,
     add_v3_v3v3(vd.co, start_co, disp);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -253,7 +253,7 @@ static void sculpt_elastic_transform_task_cb(void *__restrict userdata,
     copy_v3_v3(proxy[vd.i], final_disp);
 
     if (vd.mvert) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, vd.index);
+      BKE_pbvh_vert_tag_update_normal(ss->pbvh, vd.vertex);
     }
   }
   BKE_pbvh_vertex_iter_end;
@@ -289,9 +289,6 @@ static void sculpt_transform_radius_elastic(Sculpt *sd, Object *ob, const float
       flip_v3_v3(data.elastic_transform_pivot, ss->pivot_pos, symmpass);
       flip_v3_v3(data.elastic_transform_pivot_init, ss->init_pivot_pos, symmpass);
 
-      printf(
-          "%.2f %.2f %.2f\n", ss->init_pivot_pos[0], ss->init_pivot_pos[1], ss->init_pivot_pos[2]);
-
       const int symm_area = SCULPT_get_vertex_symm_area(data.elastic_transform_pivot);
       copy_m4_m4(data.elastic_transform_mat, data.transform_mats[symm_area]);
       BLI_task_parallel_range(
@@ -354,11 +351,6 @@ void ED_sculpt_end_transform(struct bContext *C, Object *ob)
   if (ss->filter_cache) {
     SCULPT_filter_cache_free(ss);
   }
-  /* Force undo push to happen even inside transform operator, since the sculpt
-   * undo system works separate from regular undo and this is require to properly
-   * finish an undo step also when canceling. */
-  const bool use_nested_undo = true;
-  SCULPT_undo_push_end_ex(ob, use_nested_undo);
   SCULPT_flush_update_done(C, ob, SCULPT_UPDATE_COORDS);
 }
 
@@ -426,7 +418,7 @@ static int sculpt_set_pivot_position_exec(bContext *C, wmOperator *op)
         RNA_float_get(op->ptr, "mouse_x"),
         RNA_float_get(op->ptr, "mouse_y"),
     };
-    if (SCULPT_stroke_get_location(C, stroke_location, mval)) {
+    if (SCULPT_stroke_get_location(C, stroke_location, mval, false)) {
       copy_v3_v3(ss->pivot_pos, stroke_location);
     }
   }
diff --git a/source/blender/editors/sculpt_paint/sculpt_undo.c b/source/blender/editors/sculpt_paint/sculpt_undo.c
index 1e050fedf8e..19e4120db41 100644
--- a/source/blender/editors/sculpt_paint/sculpt_undo.c
+++ b/source/blender/editors/sculpt_paint/sculpt_undo.c
@@ -4,6 +4,29 @@
 /** \file
  * \ingroup edsculpt
  * Implements the Sculpt Mode tools.
+ *
+ * Usage Guide
+ * ===========
+ *
+ * The sculpt undo system is a delta-based system. Each undo step stores
+ * the difference with the prior one.
+ *
+ * To use the sculpt undo system, you must call SCULPT_undo_push_begin
+ * inside an operator exec or invoke callback (ED_sculpt_undo_geometry_begin
+ * may be called if you wish to save a non-delta copy of the entire mesh).
+ * This will initialize the sculpt undo stack and set up an undo step.
+ *
+ * At the end of the operator you should call SCULPT_undo_push_end.
+ *
+ * SCULPT_undo_push_end and ED_sculpt_undo_geometry_begin both take a
+ * #wmOperatorType as an argument. There are _ex versions that allow a custom
+ * name; try to avoid using them. These can break the redo panel since it requires
+ * the undo push have the same name as the calling operator.
+ *
+ * NOTE: Sculpt undo steps are not appended to the global undo stack until
+ * the operator finishes.  We use BKE_undosys_step_push_init_with_type to build
+ * a tentative undo step with is appended later when the operator ends.
+ * Operators must have the OPTYPE_UNDO flag set for this to work properly.
  */
 
 #include <stddef.h>
@@ -30,6 +53,7 @@
 #include "BKE_customdata.h"
 #include "BKE_global.h"
 #include "BKE_key.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_mesh.h"
 #include "BKE_mesh_mapping.h"
@@ -144,6 +168,9 @@ struct PartialUpdateData {
   PBVH *pbvh;
   bool rebuild;
   char *modified_grids;
+  bool *modified_hidden_verts;
+  bool *modified_mask_verts;
+  bool *modified_color_verts;
 };
 
 /**
@@ -167,8 +194,39 @@ static void update_cb_partial(PBVHNode *node, void *userdata)
     }
   }
   else {
-    if (BKE_pbvh_node_vert_update_check_any(data->pbvh, node)) {
-      update_cb(node, &(data->rebuild));
+    if (BKE_pbvh_node_has_vert_with_normal_update_tag(data->pbvh, node)) {
+      BKE_pbvh_node_mark_update(node);
+    }
+    int verts_num;
+    const int *vert_indices;
+    BKE_pbvh_node_num_verts(data->pbvh, node, NULL, &verts_num);
+    BKE_pbvh_node_get_verts(data->pbvh, node, &vert_indices, NULL);
+    if (data->modified_mask_verts != NULL) {
+      for (int i = 0; i < verts_num; i++) {
+        if (data->modified_mask_verts[vert_indices[i]]) {
+          BKE_pbvh_node_mark_update_mask(node);
+          break;
+        }
+      }
+    }
+    if (data->modified_color_verts != NULL) {
+      for (int i = 0; i < verts_num; i++) {
+        if (data->modified_color_verts[vert_indices[i]]) {
+          BKE_pbvh_node_mark_update_color(node);
+          break;
+        }
+      }
+    }
+    if (data->modified_hidden_verts != NULL) {
+      for (int i = 0; i < verts_num; i++) {
+        if (data->modified_hidden_verts[vert_indices[i]]) {
+          if (data->rebuild) {
+            BKE_pbvh_node_mark_update_visibility(node);
+          }
+          BKE_pbvh_node_fully_hidden_set(node, 0);
+          break;
+        }
+      }
     }
   }
 }
@@ -195,8 +253,10 @@ static bool sculpt_undo_restore_deformed(
 
 static bool sculpt_undo_restore_coords(bContext *C, Depsgraph *depsgraph, SculptUndoNode *unode)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptSession *ss = ob->sculpt;
   SubdivCCG *subdiv_ccg = ss->subdiv_ccg;
   MVert *mvert;
@@ -263,20 +323,20 @@ static bool sculpt_undo_restore_coords(bContext *C, Depsgraph *depsgraph, Sculpt
         if (ss->deform_modifiers_active) {
           for (int i = 0; i < unode->totvert; i++) {
             sculpt_undo_restore_deformed(ss, unode, i, index[i], mvert[index[i]].co);
-            BKE_pbvh_vert_mark_update(ss->pbvh, index[i]);
+            BKE_pbvh_vert_tag_update_normal(ss->pbvh, BKE_pbvh_make_vref(index[i]));
           }
         }
         else {
           for (int i = 0; i < unode->totvert; i++) {
             swap_v3_v3(mvert[index[i]].co, unode->orig_co[i]);
-            BKE_pbvh_vert_mark_update(ss->pbvh, index[i]);
+            BKE_pbvh_vert_tag_update_normal(ss->pbvh, BKE_pbvh_make_vref(index[i]));
           }
         }
       }
       else {
         for (int i = 0; i < unode->totvert; i++) {
           swap_v3_v3(mvert[index[i]].co, unode->co[i]);
-          BKE_pbvh_vert_mark_update(ss->pbvh, index[i]);
+          BKE_pbvh_vert_tag_update_normal(ss->pbvh, BKE_pbvh_make_vref(index[i]));
         }
       }
     }
@@ -305,22 +365,24 @@ static bool sculpt_undo_restore_coords(bContext *C, Depsgraph *depsgraph, Sculpt
   return true;
 }
 
-static bool sculpt_undo_restore_hidden(bContext *C, SculptUndoNode *unode)
+static bool sculpt_undo_restore_hidden(bContext *C, SculptUndoNode *unode, bool *modified_vertices)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptSession *ss = ob->sculpt;
   SubdivCCG *subdiv_ccg = ss->subdiv_ccg;
 
-  if (unode->maxvert) {
-    MVert *mvert = ss->mvert;
+  bool *hide_vert = BKE_pbvh_get_vert_hide_for_write(ss->pbvh);
 
+  if (unode->maxvert) {
     for (int i = 0; i < unode->totvert; i++) {
-      MVert *v = &mvert[unode->index[i]];
-      if ((BLI_BITMAP_TEST(unode->vert_hidden, i) != 0) != ((v->flag & ME_HIDE) != 0)) {
+      const int vert_index = unode->index[i];
+      if ((BLI_BITMAP_TEST(unode->vert_hidden, i) != 0) != hide_vert[vert_index]) {
         BLI_BITMAP_FLIP(unode->vert_hidden, i);
-        v->flag ^= ME_HIDE;
-        BKE_pbvh_vert_mark_update(ss->pbvh, unode->index[i]);
+        hide_vert[vert_index] = !hide_vert[vert_index];
+        modified_vertices[vert_index] = true;
       }
     }
   }
@@ -335,10 +397,12 @@ static bool sculpt_undo_restore_hidden(bContext *C, SculptUndoNode *unode)
   return true;
 }
 
-static bool sculpt_undo_restore_color(bContext *C, SculptUndoNode *unode)
+static bool sculpt_undo_restore_color(bContext *C, SculptUndoNode *unode, bool *modified_vertices)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptSession *ss = ob->sculpt;
 
   bool modified = false;
@@ -360,17 +424,19 @@ static bool sculpt_undo_restore_color(bContext *C, SculptUndoNode *unode)
 
   if (modified) {
     for (int i = 0; i < unode->totvert; i++) {
-      BKE_pbvh_vert_mark_update(ss->pbvh, unode->index[i]);
+      modified_vertices[unode->index[i]] = true;
     }
   }
 
   return modified;
 }
 
-static bool sculpt_undo_restore_mask(bContext *C, SculptUndoNode *unode)
+static bool sculpt_undo_restore_mask(bContext *C, SculptUndoNode *unode, bool *modified_vertices)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptSession *ss = ob->sculpt;
   SubdivCCG *subdiv_ccg = ss->subdiv_ccg;
   float *vmask;
@@ -385,7 +451,7 @@ static bool sculpt_undo_restore_mask(bContext *C, SculptUndoNode *unode)
     for (int i = 0; i < unode->totvert; i++) {
       if (vmask[index[i]] != unode->mask[i]) {
         SWAP(float, vmask[index[i]], unode->mask[i]);
-        BKE_pbvh_vert_mark_update(ss->pbvh, index[i]);
+        modified_vertices[index[i]] = true;
       }
     }
   }
@@ -415,12 +481,15 @@ static bool sculpt_undo_restore_mask(bContext *C, SculptUndoNode *unode)
 
 static bool sculpt_undo_restore_face_sets(bContext *C, SculptUndoNode *unode)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Mesh *me = BKE_object_get_original_mesh(ob);
-  int *face_sets = CustomData_get_layer(&me->pdata, CD_SCULPT_FACE_SETS);
+  int *face_sets = CustomData_add_layer(
+      &me->pdata, CD_SCULPT_FACE_SETS, CD_CONSTRUCT, NULL, me->totpoly);
   for (int i = 0; i < me->totpoly; i++) {
-    face_sets[i] = unode->face_sets[i];
+    SWAP(int, face_sets[i], unode->face_sets[i]);
   }
   return false;
 }
@@ -478,7 +547,7 @@ static void sculpt_undo_bmesh_enable(Object *ob, SculptUndoNode *unode)
                               .use_toolflags = false,
                           }));
   BM_data_layer_add(ss->bm, &ss->bm->vdata, CD_PAINT_MASK);
-  SCULPT_dyntopo_node_layers_add(ss);
+
   me->flag |= ME_SCULPT_DYNAMIC_TOPOLOGY;
 
   /* Restore the BMLog using saved entries. */
@@ -569,8 +638,6 @@ static void sculpt_undo_geometry_restore_data(SculptUndoNodeGeometry *geometry,
   CustomData_copy(
       &geometry->pdata, &mesh->pdata, CD_MASK_MESH.pmask, CD_DUPLICATE, geometry->totpoly);
 
-  BKE_mesh_update_customdata_pointers(mesh, false);
-
   BKE_mesh_runtime_clear_cache(mesh);
 }
 
@@ -665,7 +732,8 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptSession *ss = ob->sculpt;
   SubdivCCG *subdiv_ccg = ss->subdiv_ccg;
   SculptUndoNode *unode;
@@ -699,7 +767,7 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
 
       BKE_sculpt_update_object_for_edit(depsgraph, ob, true, need_mask, false);
 
-      SCULPT_visibility_sync_all_face_sets_to_vertices(ob);
+      SCULPT_visibility_sync_all_from_faces(ob);
 
       BKE_pbvh_update_vertex_data(ss->pbvh, PBVH_UpdateVisibility);
 
@@ -731,6 +799,12 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
     }
   }
 
+  /* The PBVH already keeps track of which vertices need updated normals, but it doesn't keep track
+   * of other updated. In order to tell the corresponding PBVH nodes to update, keep track of which
+   * elements were updated for specific layers. */
+  bool *modified_hidden_verts = NULL;
+  bool *modified_mask_verts = NULL;
+  bool *modified_color_verts = NULL;
   char *undo_modified_grids = NULL;
   bool use_multires_undo = false;
 
@@ -763,13 +837,19 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
         }
         break;
       case SCULPT_UNDO_HIDDEN:
-        if (sculpt_undo_restore_hidden(C, unode)) {
+        if (modified_hidden_verts == NULL) {
+          modified_hidden_verts = MEM_calloc_arrayN(ss->totvert, sizeof(bool), __func__);
+        }
+        if (sculpt_undo_restore_hidden(C, unode, modified_hidden_verts)) {
           rebuild = true;
           update_visibility = true;
         }
         break;
       case SCULPT_UNDO_MASK:
-        if (sculpt_undo_restore_mask(C, unode)) {
+        if (modified_mask_verts == NULL) {
+          modified_mask_verts = MEM_calloc_arrayN(ss->totvert, sizeof(bool), __func__);
+        }
+        if (sculpt_undo_restore_mask(C, unode, modified_mask_verts)) {
           update = true;
           update_mask = true;
         }
@@ -777,7 +857,10 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
       case SCULPT_UNDO_FACE_SETS:
         break;
       case SCULPT_UNDO_COLOR:
-        if (sculpt_undo_restore_color(C, unode)) {
+        if (modified_color_verts == NULL) {
+          modified_color_verts = MEM_calloc_arrayN(ss->totvert, sizeof(bool), __func__);
+        }
+        if (sculpt_undo_restore_color(C, unode, modified_color_verts)) {
           update = true;
         }
 
@@ -828,6 +911,9 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
         .rebuild = rebuild,
         .pbvh = ss->pbvh,
         .modified_grids = undo_modified_grids,
+        .modified_hidden_verts = modified_hidden_verts,
+        .modified_mask_verts = modified_mask_verts,
+        .modified_color_verts = modified_color_verts,
     };
     BKE_pbvh_search_callback(ss->pbvh, NULL, NULL, update_cb_partial, &data);
     BKE_pbvh_update_bounds(ss->pbvh, PBVH_UpdateBB | PBVH_UpdateOriginalBB | PBVH_UpdateRedraw);
@@ -837,7 +923,6 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
     }
 
     if (update_visibility) {
-      SCULPT_visibility_sync_all_vertex_to_face_sets(ss);
       BKE_pbvh_update_visibility(ss->pbvh);
     }
 
@@ -873,6 +958,9 @@ static void sculpt_undo_restore_list(bContext *C, Depsgraph *depsgraph, ListBase
     }
   }
 
+  MEM_SAFE_FREE(modified_hidden_verts);
+  MEM_SAFE_FREE(modified_mask_verts);
+  MEM_SAFE_FREE(modified_color_verts);
   MEM_SAFE_FREE(undo_modified_grids);
 }
 
@@ -944,7 +1032,7 @@ static bool sculpt_undo_cleanup(bContext *C, ListBase *lb)
 {
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   SculptUndoNode *unode;
 
   unode = lb->first;
@@ -1087,8 +1175,7 @@ static SculptUndoNode *sculpt_undo_alloc_node(Object *ob, PBVHNode *node, Sculpt
       unode->co = MEM_callocN(alloc_size, "SculptUndoNode.co");
       usculpt->undo_size += alloc_size;
 
-      /* FIXME: Should explain why this is allocated here, to be freed in
-       * `SCULPT_undo_push_end_ex()`? */
+      /* Needed for original data lookup. */
       alloc_size = sizeof(*unode->no) * (size_t)allvert;
       unode->no = MEM_callocN(alloc_size, "SculptUndoNode.no");
       usculpt->undo_size += alloc_size;
@@ -1191,6 +1278,11 @@ static void sculpt_undo_store_hidden(Object *ob, SculptUndoNode *unode)
   PBVH *pbvh = ob->sculpt->pbvh;
   PBVHNode *node = unode->node;
 
+  const bool *hide_vert = BKE_pbvh_get_vert_hide(pbvh);
+  if (hide_vert == NULL) {
+    return;
+  }
+
   if (unode->grids) {
     /* Already stored during allocation. */
   }
@@ -1202,7 +1294,7 @@ static void sculpt_undo_store_hidden(Object *ob, SculptUndoNode *unode)
     BKE_pbvh_node_num_verts(pbvh, node, NULL, &allvert);
     BKE_pbvh_node_get_verts(pbvh, node, &vert_indices, &mvert);
     for (int i = 0; i < allvert; i++) {
-      BLI_BITMAP_SET(unode->vert_hidden, i, mvert[vert_indices[i]].flag & ME_HIDE);
+      BLI_BITMAP_SET(unode->vert_hidden, i, hide_vert[vert_indices[i]]);
     }
   }
 }
@@ -1273,8 +1365,13 @@ static SculptUndoNode *sculpt_undo_face_sets_push(Object *ob, SculptUndoType typ
   unode->face_sets = MEM_callocN(me->totpoly * sizeof(int), "sculpt face sets");
 
   const int *face_sets = CustomData_get_layer(&me->pdata, CD_SCULPT_FACE_SETS);
-  for (int i = 0; i < me->totpoly; i++) {
-    unode->face_sets[i] = face_sets[i];
+  if (face_sets) {
+    for (int i = 0; i < me->totpoly; i++) {
+      unode->face_sets[i] = face_sets[i];
+    }
+  }
+  else {
+    memset(unode->face_sets, SCULPT_FACE_SET_NONE, sizeof(int) * me->totpoly);
   }
 
   BLI_addtail(&usculpt->nodes, unode);
@@ -1432,7 +1529,9 @@ SculptUndoNode *SCULPT_undo_push_node(Object *ob, PBVHNode *node, SculptUndoType
       sculpt_undo_store_hidden(ob, unode);
       break;
     case SCULPT_UNDO_MASK:
-      sculpt_undo_store_mask(ob, unode);
+      if (pbvh_has_mask(ss->pbvh)) {
+        sculpt_undo_store_mask(ob, unode);
+      }
       break;
     case SCULPT_UNDO_COLOR:
       sculpt_undo_store_color(ob, unode);
@@ -1486,7 +1585,12 @@ static void sculpt_save_active_attribute(Object *ob, SculptAttrRef *attr)
   attr->was_set = true;
 }
 
-void SCULPT_undo_push_begin(Object *ob, const char *name)
+void SCULPT_undo_push_begin(Object *ob, const wmOperator *op)
+{
+  SCULPT_undo_push_begin_ex(ob, op->type->name);
+}
+
+void SCULPT_undo_push_begin_ex(Object *ob, const char *name)
 {
   UndoStack *ustack = ED_undo_stack_get();
 
@@ -1582,11 +1686,12 @@ static void sculpt_undo_set_active_layer(struct bContext *C, SculptAttrRef *attr
    */
   if (!layer) {
     layer = BKE_id_attribute_search(&me->id, attr->name, CD_MASK_PROP_ALL, ATTR_DOMAIN_MASK_ALL);
-    eAttrDomain domain = layer ? BKE_id_attribute_domain(&me->id, layer) : ATTR_DOMAIN_NUM;
-
-    if (layer && ED_geometry_attribute_convert(
-                     me, attr->name, layer->type, domain, attr->type, attr->domain)) {
-      layer = BKE_id_attribute_find(&me->id, attr->name, attr->type, attr->domain);
+    if (layer) {
+      const eAttrDomain domain = BKE_id_attribute_domain(&me->id, layer);
+      if (ED_geometry_attribute_convert(
+              me, attr->name, layer->type, domain, attr->type, attr->domain)) {
+        layer = BKE_id_attribute_find(&me->id, attr->name, attr->type, attr->domain);
+      }
     }
   }
 
@@ -1595,7 +1700,7 @@ static void sculpt_undo_set_active_layer(struct bContext *C, SculptAttrRef *attr
     CustomData *cdata = attr->domain == ATTR_DOMAIN_POINT ? &me->vdata : &me->ldata;
     int totelem = attr->domain == ATTR_DOMAIN_POINT ? me->totvert : me->totloop;
 
-    CustomData_add_layer_named(cdata, attr->type, CD_DEFAULT, NULL, totelem, attr->name);
+    CustomData_add_layer_named(cdata, attr->type, CD_SET_DEFAULT, NULL, totelem, attr->name);
     layer = BKE_id_attribute_find(&me->id, attr->name, attr->type, attr->domain);
   }
 
@@ -1728,7 +1833,8 @@ static void sculpt_undosys_step_decode(
   {
     Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
     if (ob && (ob->type == OB_MESH)) {
       if (ob->mode & (OB_MODE_SCULPT | OB_MODE_VERTEX_PAINT)) {
         /* Pass. */
@@ -1774,9 +1880,15 @@ static void sculpt_undosys_step_free(UndoStep *us_p)
   sculpt_undo_free_list(&us->data.nodes);
 }
 
-void ED_sculpt_undo_geometry_begin(struct Object *ob, const char *name)
+void ED_sculpt_undo_geometry_begin(struct Object *ob, const wmOperator *op)
+{
+  SCULPT_undo_push_begin(ob, op);
+  SCULPT_undo_push_node(ob, NULL, SCULPT_UNDO_GEOMETRY);
+}
+
+void ED_sculpt_undo_geometry_begin_ex(struct Object *ob, const char *name)
 {
-  SCULPT_undo_push_begin(ob, name);
+  SCULPT_undo_push_begin_ex(ob, name);
   SCULPT_undo_push_node(ob, NULL, SCULPT_UNDO_GEOMETRY);
 }
 
@@ -1889,7 +2001,7 @@ void ED_sculpt_undo_push_multires_mesh_begin(bContext *C, const char *str)
 
   Object *object = CTX_data_active_object(C);
 
-  SCULPT_undo_push_begin(object, str);
+  SCULPT_undo_push_begin_ex(object, str);
 
   SculptUndoNode *geometry_unode = SCULPT_undo_push_node(object, NULL, SCULPT_UNDO_GEOMETRY);
   geometry_unode->geometry_clear_pbvh = false;
diff --git a/source/blender/editors/sculpt_paint/sculpt_uv.c b/source/blender/editors/sculpt_paint/sculpt_uv.c
index 8e1f4f4d495..4739fa52674 100644
--- a/source/blender/editors/sculpt_paint/sculpt_uv.c
+++ b/source/blender/editors/sculpt_paint/sculpt_uv.c
@@ -9,7 +9,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "BLI_ghash.h"
-#include "BLI_math.h"
+#include "BLI_math_base_safe.h"
 #include "BLI_utildefines.h"
 
 #include "DNA_brush_types.h"
@@ -22,6 +22,7 @@
 #include "BKE_context.h"
 #include "BKE_customdata.h"
 #include "BKE_editmesh.h"
+#include "BKE_image.h"
 #include "BKE_mesh_mapping.h"
 #include "BKE_paint.h"
 
@@ -30,6 +31,7 @@
 #include "ED_image.h"
 #include "ED_mesh.h"
 #include "ED_screen.h"
+#include "ED_uvedit.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -42,6 +44,9 @@
 
 #include "UI_view2d.h"
 
+/* When set, the UV element is on the boundary of the graph.
+ * i.e. Instead of a 2-dimensional laplace operator, use a 1-dimensional version.
+ * Visually, UV elements on the graph boundary appear as borders of the UV Island. */
 #define MARK_BOUNDARY 1
 
 typedef struct UvAdjacencyElement {
@@ -49,16 +54,17 @@ typedef struct UvAdjacencyElement {
   UvElement *element;
   /* uv pointer for convenience. Caution, this points to the original UVs! */
   float *uv;
-  /* general use flag (Used to check if Element is boundary here) */
-  char flag;
+  /* Are we on locked in place? */
+  bool is_locked;
+  /* Are we on the boundary? */
+  bool is_boundary;
 } UvAdjacencyElement;
 
 typedef struct UvEdge {
   uint uv1;
   uint uv2;
-  /* general use flag
-   * (Used to check if edge is boundary here, and propagates to adjacency elements) */
-  char flag;
+  /* Are we in the interior? */
+  bool is_interior;
 } UvEdge;
 
 typedef struct UVInitialStrokeElement {
@@ -90,13 +96,13 @@ typedef struct UvSculptData {
    * to their coincident UV's */
   UvAdjacencyElement *uv;
 
-  /* ...Is what it says */
+  /* Total number of unique UVs. */
   int totalUniqueUvs;
 
   /* Edges used for adjacency info, used with laplacian smoothing */
   UvEdge *uvedges;
 
-  /* need I say more? */
+  /* Total number of #UvEdge. */
   int totalUvEdges;
 
   /* data for initial stroke, used by tools like grab */
@@ -116,8 +122,25 @@ typedef struct UvSculptData {
 
   /* store invert flag here */
   char invert;
+
+  /* Is constrain to image bounds active? */
+  bool constrain_to_bounds;
+
+  /* Base for constrain_to_bounds. */
+  float uv_base_offset[2];
 } UvSculptData;
 
+static void apply_sculpt_data_constraints(UvSculptData *sculptdata, float uv[2])
+{
+  if (!sculptdata->constrain_to_bounds) {
+    return;
+  }
+  float u = sculptdata->uv_base_offset[0];
+  float v = sculptdata->uv_base_offset[1];
+  uv[0] = clamp_f(uv[0], u, u + 1.0f);
+  uv[1] = clamp_f(uv[1], v, v + 1.0f);
+}
+
 /*********** Improved Laplacian Relaxation Operator ************************/
 /* original code by Raul Fernandez Hernandez "farsthary"                   *
  * adapted to uv smoothing by Antony Riakiatakis                           *
@@ -170,17 +193,14 @@ static void HC_relaxation_iteration_uv(BMEditMesh *em,
   }
 
   for (i = 0; i < sculptdata->totalUniqueUvs; i++) {
-    float dist;
-    /* This is supposed to happen only if "Pin Edges" is on,
-     * since we have initialization on stroke start.
-     * If ever uv brushes get their own mode we should check for toolsettings option too. */
-    if (sculptdata->uv[i].flag & MARK_BOUNDARY) {
+    if (sculptdata->uv[i].is_locked) {
       continue;
     }
 
     sub_v2_v2v2(diff, sculptdata->uv[i].uv, mouse_coord);
     diff[1] /= aspectRatio;
-    if ((dist = dot_v2v2(diff, diff)) <= radius) {
+    float dist = dot_v2v2(diff, diff);
+    if (dist <= radius) {
       UvElement *element;
       float strength;
       strength = alpha * BKE_brush_curve_strength_clamped(brush, sqrtf(dist), radius_root);
@@ -196,6 +216,8 @@ static void HC_relaxation_iteration_uv(BMEditMesh *em,
                                      0.5f * (tmp_uvdata[i].b[1] +
                                              tmp_uvdata[i].sum_b[1] / tmp_uvdata[i].ncounter));
 
+      apply_sculpt_data_constraints(sculptdata, sculptdata->uv[i].uv);
+
       for (element = sculptdata->uv[i].element; element; element = element->next) {
         MLoopUV *luv;
         BMLoop *l;
@@ -211,9 +233,16 @@ static void HC_relaxation_iteration_uv(BMEditMesh *em,
     }
   }
 
-  MEM_freeN(tmp_uvdata);
+  MEM_SAFE_FREE(tmp_uvdata);
 }
 
+/* Legacy version which only does laplacian relaxation.
+ * Probably a little faster as it caches UvEdges.
+ * Mostly preserved for comparison with `HC_relaxation_iteration_uv`.
+ * Once the HC method has been merged into `relaxation_iteration_uv`,
+ * all the `HC_*` and `laplacian_*` specific functions can probably be removed.
+ */
+
 static void laplacian_relaxation_iteration_uv(BMEditMesh *em,
                                               UvSculptData *sculptdata,
                                               const float mouse_coord[2],
@@ -233,14 +262,19 @@ static void laplacian_relaxation_iteration_uv(BMEditMesh *em,
   /* counting neighbors */
   for (i = 0; i < sculptdata->totalUvEdges; i++) {
     UvEdge *tmpedge = sculptdata->uvedges + i;
-    tmp_uvdata[tmpedge->uv1].ncounter++;
-    tmp_uvdata[tmpedge->uv2].ncounter++;
-
-    add_v2_v2(tmp_uvdata[tmpedge->uv2].sum_co, sculptdata->uv[tmpedge->uv1].uv);
-    add_v2_v2(tmp_uvdata[tmpedge->uv1].sum_co, sculptdata->uv[tmpedge->uv2].uv);
+    bool code1 = sculptdata->uv[sculptdata->uvedges[i].uv1].is_boundary;
+    bool code2 = sculptdata->uv[sculptdata->uvedges[i].uv2].is_boundary;
+    if (code1 || (code1 == code2)) {
+      tmp_uvdata[tmpedge->uv2].ncounter++;
+      add_v2_v2(tmp_uvdata[tmpedge->uv2].sum_co, sculptdata->uv[tmpedge->uv1].uv);
+    }
+    if (code2 || (code1 == code2)) {
+      tmp_uvdata[tmpedge->uv1].ncounter++;
+      add_v2_v2(tmp_uvdata[tmpedge->uv1].sum_co, sculptdata->uv[tmpedge->uv2].uv);
+    }
   }
 
-  /* Original Lacplacian algorithm included removal of normal component of translation.
+  /* Original Laplacian algorithm included removal of normal component of translation.
    * here it is not needed since we translate along the UV plane always. */
   for (i = 0; i < sculptdata->totalUniqueUvs; i++) {
     copy_v2_v2(tmp_uvdata[i].p, tmp_uvdata[i].sum_co);
@@ -248,17 +282,14 @@ static void laplacian_relaxation_iteration_uv(BMEditMesh *em,
   }
 
   for (i = 0; i < sculptdata->totalUniqueUvs; i++) {
-    float dist;
-    /* This is supposed to happen only if "Pin Edges" is on,
-     * since we have initialization on stroke start.
-     * If ever uv brushes get their own mode we should check for toolsettings option too. */
-    if (sculptdata->uv[i].flag & MARK_BOUNDARY) {
+    if (sculptdata->uv[i].is_locked) {
       continue;
     }
 
     sub_v2_v2v2(diff, sculptdata->uv[i].uv, mouse_coord);
     diff[1] /= aspectRatio;
-    if ((dist = dot_v2v2(diff, diff)) <= radius) {
+    float dist = dot_v2v2(diff, diff);
+    if (dist <= radius) {
       UvElement *element;
       float strength;
       strength = alpha * BKE_brush_curve_strength_clamped(brush, sqrtf(dist), radius_root);
@@ -268,6 +299,8 @@ static void laplacian_relaxation_iteration_uv(BMEditMesh *em,
       sculptdata->uv[i].uv[1] = (1.0f - strength) * sculptdata->uv[i].uv[1] +
                                 strength * tmp_uvdata[i].p[1];
 
+      apply_sculpt_data_constraints(sculptdata, sculptdata->uv[i].uv);
+
       for (element = sculptdata->uv[i].element; element; element = element->next) {
         MLoopUV *luv;
         BMLoop *l;
@@ -283,7 +316,154 @@ static void laplacian_relaxation_iteration_uv(BMEditMesh *em,
     }
   }
 
-  MEM_freeN(tmp_uvdata);
+  MEM_SAFE_FREE(tmp_uvdata);
+}
+
+static void add_weighted_edge(float (*delta_buf)[3],
+                              const UvElement *storage,
+                              const UvElement *ele_next,
+                              const UvElement *ele_prev,
+                              const MLoopUV *luv_next,
+                              const MLoopUV *luv_prev,
+                              const float weight)
+{
+  float delta[2];
+  sub_v2_v2v2(delta, luv_next->uv, luv_prev->uv);
+
+  bool code1 = (ele_prev->flag & MARK_BOUNDARY);
+  bool code2 = (ele_next->flag & MARK_BOUNDARY);
+  if (code1 || (code1 == code2)) {
+    int index_next = ele_next - storage;
+    delta_buf[index_next][0] -= delta[0] * weight;
+    delta_buf[index_next][1] -= delta[1] * weight;
+    delta_buf[index_next][2] += fabsf(weight);
+  }
+  if (code2 || (code1 == code2)) {
+    int index_prev = ele_prev - storage;
+    delta_buf[index_prev][0] += delta[0] * weight;
+    delta_buf[index_prev][1] += delta[1] * weight;
+    delta_buf[index_prev][2] += fabsf(weight);
+  }
+}
+
+static float tri_weight_v3(int method, const float *v1, const float *v2, const float *v3)
+{
+  switch (method) {
+    case UV_SCULPT_TOOL_RELAX_LAPLACIAN:
+    case UV_SCULPT_TOOL_RELAX_HC:
+      return 1.0f;
+    case UV_SCULPT_TOOL_RELAX_COTAN:
+      return cotangent_tri_weight_v3(v1, v2, v3);
+    default:
+      BLI_assert_unreachable();
+  }
+  return 0.0f;
+}
+
+static void relaxation_iteration_uv(BMEditMesh *em,
+                                    UvSculptData *sculptdata,
+                                    const float mouse_coord[2],
+                                    const float alpha,
+                                    const float radius_squared,
+                                    const float aspect_ratio,
+                                    const int method)
+{
+  if (method == UV_SCULPT_TOOL_RELAX_HC) {
+    HC_relaxation_iteration_uv(em, sculptdata, mouse_coord, alpha, radius_squared, aspect_ratio);
+    return;
+  }
+  if (method == UV_SCULPT_TOOL_RELAX_LAPLACIAN) {
+    laplacian_relaxation_iteration_uv(
+        em, sculptdata, mouse_coord, alpha, radius_squared, aspect_ratio);
+    return;
+  }
+
+  struct UvElement **head_table = BM_uv_element_map_ensure_head_table(sculptdata->elementMap);
+
+  const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+  BLI_assert(cd_loop_uv_offset >= 0);
+
+  const int total_uvs = sculptdata->elementMap->total_uvs;
+  float(*delta_buf)[3] = (float(*)[3])MEM_callocN(total_uvs * sizeof(float[3]), __func__);
+
+  const UvElement *storage = sculptdata->elementMap->storage;
+  for (int j = 0; j < total_uvs; j++) {
+    const UvElement *ele_curr = storage + j;
+    const BMFace *efa = ele_curr->l->f;
+    const UvElement *ele_next = BM_uv_element_get(sculptdata->elementMap, efa, ele_curr->l->next);
+    const UvElement *ele_prev = BM_uv_element_get(sculptdata->elementMap, efa, ele_curr->l->prev);
+
+    const float *v_curr_co = ele_curr->l->v->co;
+    const float *v_prev_co = ele_prev->l->v->co;
+    const float *v_next_co = ele_next->l->v->co;
+
+    const MLoopUV *luv_curr = BM_ELEM_CD_GET_VOID_P(ele_curr->l, cd_loop_uv_offset);
+    const MLoopUV *luv_next = BM_ELEM_CD_GET_VOID_P(ele_next->l, cd_loop_uv_offset);
+    const MLoopUV *luv_prev = BM_ELEM_CD_GET_VOID_P(ele_prev->l, cd_loop_uv_offset);
+
+    const UvElement *head_curr = head_table[ele_curr - sculptdata->elementMap->storage];
+    const UvElement *head_next = head_table[ele_next - sculptdata->elementMap->storage];
+    const UvElement *head_prev = head_table[ele_prev - sculptdata->elementMap->storage];
+
+    /* If the mesh is triangulated with no boundaries, only one edge is required. */
+    const float weight_curr = tri_weight_v3(method, v_curr_co, v_prev_co, v_next_co);
+    add_weighted_edge(delta_buf, storage, head_next, head_prev, luv_next, luv_prev, weight_curr);
+
+    /* Triangulated with a boundary? We need the incoming edges to solve the boundary. */
+    const float weight_prev = tri_weight_v3(method, v_prev_co, v_curr_co, v_next_co);
+    add_weighted_edge(delta_buf, storage, head_next, head_curr, luv_next, luv_curr, weight_prev);
+
+    if (method == UV_SCULPT_TOOL_RELAX_LAPLACIAN) {
+      /* Laplacian method has zero weights on virtual edges. */
+      continue;
+    }
+
+    /* Meshes with quads (or other n-gons) need "virtual" edges too. */
+    const float weight_next = tri_weight_v3(method, v_next_co, v_curr_co, v_prev_co);
+    add_weighted_edge(delta_buf, storage, head_prev, head_curr, luv_prev, luv_curr, weight_next);
+  }
+
+  Brush *brush = BKE_paint_brush(sculptdata->uvsculpt);
+  for (int i = 0; i < sculptdata->totalUniqueUvs; i++) {
+    UvAdjacencyElement *adj_el = &sculptdata->uv[i];
+    if (adj_el->is_locked) {
+      continue; /* Locked UVs can't move. */
+    }
+
+    /* Is UV within brush's influence? */
+    float diff[2];
+    sub_v2_v2v2(diff, adj_el->uv, mouse_coord);
+    diff[1] /= aspect_ratio;
+    const float dist_squared = len_squared_v2(diff);
+    if (dist_squared > radius_squared) {
+      continue;
+    }
+    const float strength = alpha * BKE_brush_curve_strength_clamped(
+                                       brush, sqrtf(dist_squared), sqrtf(radius_squared));
+
+    const float *delta_sum = delta_buf[adj_el->element - storage];
+
+    {
+      MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(adj_el->element->l, cd_loop_uv_offset);
+      BLI_assert(adj_el->uv == luv->uv); /* Only true for head. */
+      adj_el->uv[0] = luv->uv[0] + strength * safe_divide(delta_sum[0], delta_sum[2]);
+      adj_el->uv[1] = luv->uv[1] + strength * safe_divide(delta_sum[1], delta_sum[2]);
+      apply_sculpt_data_constraints(sculptdata, adj_el->uv);
+    }
+
+    /* Copy UV co-ordinates to all UvElements. */
+    UvElement *tail = adj_el->element;
+    while (tail) {
+      MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(tail->l, cd_loop_uv_offset);
+      copy_v2_v2(luv->uv, adj_el->uv);
+      tail = tail->next;
+      if (tail && tail->separate) {
+        break;
+      }
+    }
+  }
+
+  MEM_SAFE_FREE(delta_buf);
 }
 
 static void uv_sculpt_stroke_apply(bContext *C,
@@ -327,17 +507,15 @@ static void uv_sculpt_stroke_apply(bContext *C,
     int i;
     alpha *= invert;
     for (i = 0; i < sculptdata->totalUniqueUvs; i++) {
-      float dist, diff[2];
-      /* This is supposed to happen only if "Lock Borders" is on,
-       * since we have initialization on stroke start.
-       * If ever uv brushes get their own mode we should check for toolsettings option too. */
-      if (sculptdata->uv[i].flag & MARK_BOUNDARY) {
+      if (sculptdata->uv[i].is_locked) {
         continue;
       }
 
+      float diff[2];
       sub_v2_v2v2(diff, sculptdata->uv[i].uv, co);
       diff[1] /= aspectRatio;
-      if ((dist = dot_v2v2(diff, diff)) <= radius) {
+      float dist = dot_v2v2(diff, diff);
+      if (dist <= radius) {
         UvElement *element;
         float strength;
         strength = alpha * BKE_brush_curve_strength_clamped(brush, sqrtf(dist), radius_root);
@@ -346,6 +524,8 @@ static void uv_sculpt_stroke_apply(bContext *C,
         sculptdata->uv[i].uv[0] -= strength * diff[0] * 0.001f;
         sculptdata->uv[i].uv[1] -= strength * diff[1] * 0.001f;
 
+        apply_sculpt_data_constraints(sculptdata, sculptdata->uv[i].uv);
+
         for (element = sculptdata->uv[i].element; element; element = element->next) {
           MLoopUV *luv;
           BMLoop *l;
@@ -363,16 +543,11 @@ static void uv_sculpt_stroke_apply(bContext *C,
   }
 
   /*
-   * Smooth Tool
+   * Relax Tool
    */
   else if (tool == UV_SCULPT_TOOL_RELAX) {
-    uint method = toolsettings->uv_relax_method;
-    if (method == UV_SCULPT_TOOL_RELAX_HC) {
-      HC_relaxation_iteration_uv(em, sculptdata, co, alpha, radius, aspectRatio);
-    }
-    else {
-      laplacian_relaxation_iteration_uv(em, sculptdata, co, alpha, radius, aspectRatio);
-    }
+    relaxation_iteration_uv(
+        em, sculptdata, co, alpha, radius, aspectRatio, toolsettings->uv_relax_method);
   }
 
   /*
@@ -392,6 +567,8 @@ static void uv_sculpt_stroke_apply(bContext *C,
       sculptdata->uv[uvindex].uv[1] =
           sculptdata->initial_stroke->initialSelection[i].initial_uv[1] + strength * diff[1];
 
+      apply_sculpt_data_constraints(sculptdata, sculptdata->uv[uvindex].uv);
+
       for (element = sculptdata->uv[uvindex].element; element; element = element->next) {
         MLoopUV *luv;
         BMLoop *l;
@@ -405,32 +582,32 @@ static void uv_sculpt_stroke_apply(bContext *C,
         copy_v2_v2(luv->uv, sculptdata->uv[uvindex].uv);
       }
     }
+    if (sima->flag & SI_LIVE_UNWRAP) {
+      ED_uvedit_live_unwrap_re_solve();
+    }
   }
 }
 
 static void uv_sculpt_stroke_exit(bContext *C, wmOperator *op)
 {
+  SpaceImage *sima = CTX_wm_space_image(C);
+  if (sima->flag & SI_LIVE_UNWRAP) {
+    ED_uvedit_live_unwrap_end(false);
+  }
   UvSculptData *data = op->customdata;
   if (data->timer) {
     WM_event_remove_timer(CTX_wm_manager(C), CTX_wm_window(C), data->timer);
   }
-  if (data->elementMap) {
-    BM_uv_element_map_free(data->elementMap);
-  }
-  if (data->uv) {
-    MEM_freeN(data->uv);
-  }
-  if (data->uvedges) {
-    MEM_freeN(data->uvedges);
-  }
+  BM_uv_element_map_free(data->elementMap);
+  data->elementMap = NULL;
+  MEM_SAFE_FREE(data->uv);
+  MEM_SAFE_FREE(data->uvedges);
   if (data->initial_stroke) {
-    if (data->initial_stroke->initialSelection) {
-      MEM_freeN(data->initial_stroke->initialSelection);
-    }
-    MEM_freeN(data->initial_stroke);
+    MEM_SAFE_FREE(data->initial_stroke->initialSelection);
+    MEM_SAFE_FREE(data->initial_stroke);
   }
 
-  MEM_freeN(data);
+  MEM_SAFE_FREE(data);
   op->customdata = NULL;
 }
 
@@ -441,7 +618,7 @@ static int uv_element_offset_from_face_get(
   if (!element || (doIslands && element->island != island_index)) {
     return -1;
   }
-  return element - map->buf;
+  return element - map->storage;
 }
 
 static uint uv_edge_hash(const void *key)
@@ -461,6 +638,17 @@ static bool uv_edge_compare(const void *a, const void *b)
   return true;
 }
 
+static void set_element_flag(UvElement *element, const int flag)
+{
+  while (element) {
+    element->flag |= flag;
+    element = element->next;
+    if (!element || element->separate) {
+      break;
+    }
+  }
+}
+
 static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wmEvent *event)
 {
   Scene *scene = CTX_data_scene(C);
@@ -475,7 +663,6 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
   BKE_curvemapping_init(ts->uvsculpt->paint.brush->curve);
 
   if (data) {
-    int counter = 0, i;
     ARegion *region = CTX_wm_region(C);
     float co[2];
     BMFace *efa;
@@ -489,8 +676,6 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
 
     bool do_island_optimization = !(ts->uv_sculpt_settings & UV_SCULPT_ALL_ISLANDS);
     int island_index = 0;
-    /* Holds, for each UvElement in elementMap, a pointer to its unique UV. */
-    int *uniqueUv;
     data->tool = (RNA_enum_get(op->ptr, "mode") == BRUSH_STROKE_SMOOTH) ?
                      UV_SCULPT_TOOL_RELAX :
                      ts->uvsculpt->paint.brush->uv_sculpt_tool;
@@ -498,23 +683,13 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
 
     data->uvsculpt = &ts->uvsculpt->paint;
 
-    if (do_island_optimization) {
-      /* We will need island information */
-      if (ts->uv_flag & UV_SYNC_SELECTION) {
-        data->elementMap = BM_uv_element_map_create(bm, scene, false, false, true, true);
-      }
-      else {
-        data->elementMap = BM_uv_element_map_create(bm, scene, true, false, true, true);
-      }
-    }
-    else {
-      if (ts->uv_flag & UV_SYNC_SELECTION) {
-        data->elementMap = BM_uv_element_map_create(bm, scene, false, false, true, false);
-      }
-      else {
-        data->elementMap = BM_uv_element_map_create(bm, scene, true, false, true, false);
-      }
-    }
+    /* Winding was added to island detection in 5197aa04c6bd
+     * However the sculpt tools can flip faces, potentially creating orphaned islands.
+     * See T100132 */
+    const bool use_winding = false;
+    const bool use_seams = true;
+    data->elementMap = BM_uv_element_map_create(
+        bm, scene, false, use_winding, use_seams, do_island_optimization);
 
     if (!data->elementMap) {
       uv_sculpt_stroke_exit(C, op);
@@ -535,27 +710,22 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
     }
 
     /* Count 'unique' UV's */
-    for (i = 0; i < data->elementMap->totalUVs; i++) {
-      if (data->elementMap->buf[i].separate &&
-          (!do_island_optimization || data->elementMap->buf[i].island == island_index)) {
-        counter++;
-      }
+    int unique_uvs = data->elementMap->total_unique_uvs;
+    if (do_island_optimization) {
+      unique_uvs = data->elementMap->island_total_unique_uvs[island_index];
     }
 
     /* Allocate the unique uv buffers */
-    data->uv = MEM_mallocN(sizeof(*data->uv) * counter, "uv_brush_unique_uvs");
-    uniqueUv = MEM_mallocN(sizeof(*uniqueUv) * data->elementMap->totalUVs,
-                           "uv_brush_unique_uv_map");
+    data->uv = MEM_callocN(sizeof(*data->uv) * unique_uvs, "uv_brush_unique_uvs");
+    /* Holds, for each UvElement in elementMap, an index of its unique UV. */
+    int *uniqueUv = MEM_mallocN(sizeof(*uniqueUv) * data->elementMap->total_uvs,
+                                "uv_brush_unique_uv_map");
     edgeHash = BLI_ghash_new(uv_edge_hash, uv_edge_compare, "uv_brush_edge_hash");
     /* we have at most totalUVs edges */
-    edges = MEM_mallocN(sizeof(*edges) * data->elementMap->totalUVs, "uv_brush_all_edges");
+    edges = MEM_callocN(sizeof(*edges) * data->elementMap->total_uvs, "uv_brush_all_edges");
     if (!data->uv || !uniqueUv || !edgeHash || !edges) {
-      if (edges) {
-        MEM_freeN(edges);
-      }
-      if (uniqueUv) {
-        MEM_freeN(uniqueUv);
-      }
+      MEM_SAFE_FREE(edges);
+      MEM_SAFE_FREE(uniqueUv);
       if (edgeHash) {
         BLI_ghash_free(edgeHash, NULL, NULL);
       }
@@ -563,12 +733,12 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
       return NULL;
     }
 
-    data->totalUniqueUvs = counter;
-    /* So that we can use this as index for the UvElements */
-    counter = -1;
+    data->totalUniqueUvs = unique_uvs;
+    /* Index for the UvElements. */
+    int counter = -1;
     /* initialize the unique UVs */
-    for (i = 0; i < bm->totvert; i++) {
-      UvElement *element = data->elementMap->vert[i];
+    for (int i = 0; i < bm->totvert; i++) {
+      UvElement *element = data->elementMap->vertex[i];
       for (; element; element = element->next) {
         if (element->separate) {
           if (do_island_optimization && (element->island != island_index)) {
@@ -584,13 +754,18 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
 
           counter++;
           data->uv[counter].element = element;
-          data->uv[counter].flag = 0;
           data->uv[counter].uv = luv->uv;
+          if (data->tool != UV_SCULPT_TOOL_GRAB) {
+            if (luv->flag & MLOOPUV_PINNED) {
+              data->uv[counter].is_locked = true;
+            }
+          }
         }
         /* Pointer arithmetic to the rescue, as always :). */
-        uniqueUv[element - data->elementMap->buf] = counter;
+        uniqueUv[element - data->elementMap->storage] = counter;
       }
     }
+    BLI_assert(counter + 1 == unique_uvs);
 
     /* Now, on to generate our uv connectivity data */
     counter = 0;
@@ -600,7 +775,6 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
                          data->elementMap, efa, l, island_index, do_island_optimization);
         int offset2, itmp2 = uv_element_offset_from_face_get(
                          data->elementMap, efa, l->next, island_index, do_island_optimization);
-        char *flag;
 
         /* Skip edge if not found(unlikely) or not on valid island */
         if (itmp1 == -1 || itmp2 == -1) {
@@ -610,7 +784,6 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
         offset1 = uniqueUv[itmp1];
         offset2 = uniqueUv[itmp2];
 
-        edges[counter].flag = 0;
         /* Using an order policy, sort UV's according to address space.
          * This avoids having two different UvEdges with the same UV's on different positions. */
         if (offset1 < offset2) {
@@ -621,58 +794,65 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
           edges[counter].uv1 = offset2;
           edges[counter].uv2 = offset1;
         }
-        /* Hack! Set the value of the key to its flag.
-         * Now we can set the flag when an edge exists twice :) */
-        flag = BLI_ghash_lookup(edgeHash, &edges[counter]);
-        if (flag) {
-          *flag = 1;
+        UvEdge *prev_edge = BLI_ghash_lookup(edgeHash, &edges[counter]);
+        if (prev_edge) {
+          prev_edge->is_interior = true;
+          edges[counter].is_interior = true;
         }
         else {
-          /* Hack mentioned */
-          BLI_ghash_insert(edgeHash, &edges[counter], &edges[counter].flag);
+          BLI_ghash_insert(edgeHash, &edges[counter], &edges[counter]);
         }
         counter++;
       }
     }
 
-    MEM_freeN(uniqueUv);
+    MEM_SAFE_FREE(uniqueUv);
 
     /* Allocate connectivity data, we allocate edges once */
-    data->uvedges = MEM_mallocN(sizeof(*data->uvedges) * BLI_ghash_len(edgeHash),
+    data->uvedges = MEM_callocN(sizeof(*data->uvedges) * BLI_ghash_len(edgeHash),
                                 "uv_brush_edge_connectivity_data");
     if (!data->uvedges) {
       BLI_ghash_free(edgeHash, NULL, NULL);
-      MEM_freeN(edges);
+      MEM_SAFE_FREE(edges);
       uv_sculpt_stroke_exit(C, op);
       return NULL;
     }
 
     /* fill the edges with data */
-    i = 0;
-    GHASH_ITER (gh_iter, edgeHash) {
-      data->uvedges[i++] = *((UvEdge *)BLI_ghashIterator_getKey(&gh_iter));
+    {
+      int i = 0;
+      GHASH_ITER (gh_iter, edgeHash) {
+        data->uvedges[i++] = *((UvEdge *)BLI_ghashIterator_getKey(&gh_iter));
+      }
+      data->totalUvEdges = BLI_ghash_len(edgeHash);
     }
-    data->totalUvEdges = BLI_ghash_len(edgeHash);
 
     /* cleanup temporary stuff */
     BLI_ghash_free(edgeHash, NULL, NULL);
-    MEM_freeN(edges);
+    MEM_SAFE_FREE(edges);
 
     /* transfer boundary edge property to UV's */
-    if (ts->uv_sculpt_settings & UV_SCULPT_LOCK_BORDERS) {
-      for (i = 0; i < data->totalUvEdges; i++) {
-        if (!data->uvedges[i].flag) {
-          data->uv[data->uvedges[i].uv1].flag |= MARK_BOUNDARY;
-          data->uv[data->uvedges[i].uv2].flag |= MARK_BOUNDARY;
+    for (int i = 0; i < data->totalUvEdges; i++) {
+      if (!data->uvedges[i].is_interior) {
+        data->uv[data->uvedges[i].uv1].is_boundary = true;
+        data->uv[data->uvedges[i].uv2].is_boundary = true;
+        if (ts->uv_sculpt_settings & UV_SCULPT_LOCK_BORDERS) {
+          data->uv[data->uvedges[i].uv1].is_locked = true;
+          data->uv[data->uvedges[i].uv2].is_locked = true;
         }
+        set_element_flag(data->uv[data->uvedges[i].uv1].element, MARK_BOUNDARY);
+        set_element_flag(data->uv[data->uvedges[i].uv2].element, MARK_BOUNDARY);
       }
     }
 
+    SpaceImage *sima = CTX_wm_space_image(C);
+    data->constrain_to_bounds = (sima->flag & SI_CLIP_UV);
+    BKE_image_find_nearest_tile_with_offset(sima->image, co, data->uv_base_offset);
+
     /* Allocate initial selection for grab tool */
     if (data->tool == UV_SCULPT_TOOL_GRAB) {
       float radius, radius_root;
       UvSculptData *sculptdata = (UvSculptData *)op->customdata;
-      SpaceImage *sima;
       int width, height;
       float aspectRatio;
       float alpha, zoomx, zoomy;
@@ -681,7 +861,6 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
       alpha = BKE_brush_alpha_get(scene, brush);
 
       radius = BKE_brush_size_get(scene, brush);
-      sima = CTX_wm_space_image(C);
       ED_space_image_get_size(sima, &width, &height);
       ED_space_image_get_zoom(sima, region, &zoomx, &zoomy);
 
@@ -706,16 +885,16 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
       copy_v2_v2(data->initial_stroke->init_coord, co);
 
       counter = 0;
-
-      for (i = 0; i < data->totalUniqueUvs; i++) {
-        float dist, diff[2];
-        if (data->uv[i].flag & MARK_BOUNDARY) {
+      for (int i = 0; i < data->totalUniqueUvs; i++) {
+        if (data->uv[i].is_locked) {
           continue;
         }
 
+        float diff[2];
         sub_v2_v2v2(diff, data->uv[i].uv, co);
         diff[1] /= aspectRatio;
-        if ((dist = dot_v2v2(diff, diff)) <= radius) {
+        float dist = dot_v2v2(diff, diff);
+        if (dist <= radius) {
           float strength;
           strength = alpha * BKE_brush_curve_strength_clamped(brush, sqrtf(dist), radius_root);
 
@@ -727,6 +906,9 @@ static UvSculptData *uv_sculpt_stroke_init(bContext *C, wmOperator *op, const wm
       }
 
       data->initial_stroke->totalInitialSelected = counter;
+      if (sima->flag & SI_LIVE_UNWRAP) {
+        ED_uvedit_live_unwrap_begin(scene, obedit);
+      }
     }
   }
 
diff --git a/source/blender/editors/sound/sound_ops.c b/source/blender/editors/sound/sound_ops.c
index 2a8a2be8b65..08b795db0c3 100644
--- a/source/blender/editors/sound/sound_ops.c
+++ b/source/blender/editors/sound/sound_ops.c
@@ -340,7 +340,8 @@ static int sound_mixdown_exec(bContext *C, wmOperator *op)
   AUD_DeviceSpecs specs;
   AUD_Container container;
   AUD_Codec codec;
-  const char *result;
+  int result;
+  char error_message[1024] = {'\0'};
 
   sound_bake_animation_exec(C, op);
 
@@ -372,7 +373,9 @@ static int sound_mixdown_exec(bContext *C, wmOperator *op)
                                      codec,
                                      bitrate,
                                      NULL,
-                                     NULL);
+                                     NULL,
+                                     error_message,
+                                     sizeof(error_message));
   }
   else {
     result = AUD_mixdown(scene_eval->sound_scene,
@@ -385,13 +388,15 @@ static int sound_mixdown_exec(bContext *C, wmOperator *op)
                          codec,
                          bitrate,
                          NULL,
-                         NULL);
+                         NULL,
+                         error_message,
+                         sizeof(error_message));
   }
 
   BKE_sound_reset_scene_specs(scene_eval);
 
-  if (result) {
-    BKE_report(op->reports, RPT_ERROR, result);
+  if (!result) {
+    BKE_report(op->reports, RPT_ERROR, error_message);
     return OPERATOR_CANCELLED;
   }
 #else  /* WITH_AUDASPACE */
diff --git a/source/blender/editors/space_action/CMakeLists.txt b/source/blender/editors/space_action/CMakeLists.txt
index 841bd5cf91b..b9e27c4de49 100644
--- a/source/blender/editors/space_action/CMakeLists.txt
+++ b/source/blender/editors/space_action/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_action/action_data.c b/source/blender/editors/space_action/action_data.c
index 8f97a58451e..79047b171ef 100644
--- a/source/blender/editors/space_action/action_data.c
+++ b/source/blender/editors/space_action/action_data.c
@@ -169,7 +169,7 @@ static bool action_new_poll(bContext *C)
     SpaceAction *saction = (SpaceAction *)CTX_wm_space_data(C);
     Object *ob = CTX_data_active_object(C);
 
-    /* For now, actions are only for the active object, and on object and shapekey levels... */
+    /* For now, actions are only for the active object, and on object and shape-key levels... */
     if (saction->mode == SACTCONT_ACTION) {
       /* XXX: This assumes that actions are assigned to the active object in this mode */
       if (ob) {
@@ -460,7 +460,8 @@ static bool action_stash_create_poll(bContext *C)
       Scene *scene = CTX_data_scene(C);
 
       if (!(scene->flag & SCE_NLA_EDIT_ON)) {
-        /* For now, actions are only for the active object, and on object and shapekey levels... */
+        /* For now, actions are only for the active object, and on object and shape-key levels...
+         */
         return ELEM(saction->mode, SACTCONT_ACTION, SACTCONT_SHAPEKEY);
       }
     }
diff --git a/source/blender/editors/space_action/action_draw.c b/source/blender/editors/space_action/action_draw.c
index 7bdf2478862..eb56c6c4b54 100644
--- a/source/blender/editors/space_action/action_draw.c
+++ b/source/blender/editors/space_action/action_draw.c
@@ -206,7 +206,7 @@ void draw_channel_strips(bAnimContext *ac, SpaceAction *saction, ARegion *region
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_blend(GPU_BLEND_ALPHA);
 
@@ -617,7 +617,7 @@ void timeline_draw_cache(SpaceAction *saction, Object *ob, Scene *scene)
 
   uint pos_id = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   GPU_blend(GPU_BLEND_ALPHA);
 
diff --git a/source/blender/editors/space_action/action_edit.c b/source/blender/editors/space_action/action_edit.c
index e97b666810c..0803c5dc575 100644
--- a/source/blender/editors/space_action/action_edit.c
+++ b/source/blender/editors/space_action/action_edit.c
@@ -1006,7 +1006,7 @@ static bool delete_action_keys(bAnimContext *ac)
       AnimData *adt = ale->adt;
 
       /* delete selected keyframes only */
-      changed = delete_fcurve_keys(fcu);
+      changed = BKE_fcurve_delete_keys_selected(fcu);
 
       /* Only delete curve too if it won't be doing anything anymore */
       if (BKE_fcurve_is_empty(fcu)) {
@@ -1326,7 +1326,7 @@ static int actkeys_expo_exec(bContext *C, wmOperator *op)
 void ACTION_OT_extrapolation_type(wmOperatorType *ot)
 {
   /* identifiers */
-  ot->name = "Set Keyframe Extrapolation";
+  ot->name = "Set F-Curve Extrapolation";
   ot->idname = "ACTION_OT_extrapolation_type";
   ot->description = "Set extrapolation mode for selected F-Curves";
 
@@ -1364,7 +1364,7 @@ static int actkeys_ipo_exec(bContext *C, wmOperator *op)
 
   /* set handle type */
   ANIM_animdata_keyframe_callback(&ac,
-                                  (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_CURVE_VISIBLE |
+                                  (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE |
                                    ANIMFILTER_FOREDIT | ANIMFILTER_NODUPLIS |
                                    ANIMFILTER_FCURVESONLY),
                                   ANIM_editkeyframes_ipo(mode));
@@ -1414,7 +1414,7 @@ static int actkeys_easing_exec(bContext *C, wmOperator *op)
 
   /* set handle type */
   ANIM_animdata_keyframe_callback(&ac,
-                                  (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_CURVE_VISIBLE |
+                                  (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE |
                                    ANIMFILTER_FOREDIT | ANIMFILTER_NODUPLIS |
                                    ANIMFILTER_FCURVESONLY),
                                   ANIM_editkeyframes_easing(mode));
@@ -1473,7 +1473,7 @@ static void sethandles_action_keys(bAnimContext *ac, short mode)
     /* any selected keyframes for editing? */
     if (ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, sel_cb, NULL)) {
       /* change type of selected handles */
-      ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, edit_cb, BKE_fcurve_handles_recalc);
 
       ale->update |= ANIM_UPDATE_DEFAULT;
     }
@@ -1790,11 +1790,11 @@ static void snap_action_keys(bAnimContext *ac, short mode)
     }
     else if (adt) {
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 0);
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 0);
     }
     else {
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
     }
 
     ale->update |= ANIM_UPDATE_DEFAULT;
@@ -1914,11 +1914,11 @@ static void mirror_action_keys(bAnimContext *ac, short mode)
     }
     else if (adt) {
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 0);
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 0);
     }
     else {
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
     }
 
     ale->update |= ANIM_UPDATE_DEFAULT;
diff --git a/source/blender/editors/space_action/action_select.c b/source/blender/editors/space_action/action_select.c
index d1a8592ae9d..9d45a2a3b89 100644
--- a/source/blender/editors/space_action/action_select.c
+++ b/source/blender/editors/space_action/action_select.c
@@ -449,7 +449,7 @@ static void box_select_action(bAnimContext *ac, const rcti rect, short mode, sho
   filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
   ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 
-  /* Get beztriple editing/validation funcs. */
+  /* Get beztriple editing/validation functions. */
   sel_data.select_cb = ANIM_editkeyframes_select(selectmode);
 
   if (ELEM(mode, ACTKEYS_BORDERSEL_FRAMERANGE, ACTKEYS_BORDERSEL_ALLKEYS)) {
@@ -585,7 +585,7 @@ void ACTION_OT_select_box(wmOperatorType *ot)
   ot->poll = ED_operator_action_active;
 
   /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_UNDO;
 
   /* rna */
   ot->prop = RNA_def_boolean(ot->srna, "axis_range", 0, "Axis Range", "");
@@ -693,7 +693,7 @@ static void region_select_action_keys(
   filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
   ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 
-  /* Get beztriple editing/validation funcs. */
+  /* Get beztriple editing/validation functions. */
   sel_data.select_cb = ANIM_editkeyframes_select(selectmode);
   sel_data.ok_cb = ANIM_editkeyframes_ok(mode);
 
@@ -919,7 +919,7 @@ static const EnumPropertyItem prop_column_select_types[] = {
 /* ------------------- */
 
 /* Selects all visible keyframes between the specified markers */
-/* TODO(campbell): this is almost an _exact_ duplicate of a function of the same name in
+/* TODO(@campbellbarton): this is almost an _exact_ duplicate of a function of the same name in
  * graph_select.c should de-duplicate. */
 static void markers_selectkeys_between(bAnimContext *ac)
 {
@@ -936,7 +936,7 @@ static void markers_selectkeys_between(bAnimContext *ac)
   min -= 0.5f;
   max += 0.5f;
 
-  /* get editing funcs + data */
+  /* Get editing functions + data. */
   ok_cb = ANIM_editkeyframes_ok(BEZT_OK_FRAMERANGE);
   select_cb = ANIM_editkeyframes_select(SELECT_ADD);
 
@@ -1129,6 +1129,7 @@ void ACTION_OT_select_column(wmOperatorType *ot)
 
   /* props */
   ot->prop = RNA_def_enum(ot->srna, "mode", prop_column_select_types, 0, "Mode", "");
+  RNA_def_property_flag(ot->prop, PROP_HIDDEN);
 }
 
 /* ******************** Select Linked Operator *********************** */
diff --git a/source/blender/editors/space_action/space_action.c b/source/blender/editors/space_action/space_action.c
index 3e507f73d1a..b54750accb0 100644
--- a/source/blender/editors/space_action/space_action.c
+++ b/source/blender/editors/space_action/space_action.c
@@ -90,7 +90,6 @@ static SpaceLink *action_create(const ScrArea *area, const Scene *scene)
   BLI_addtail(&saction->regionbase, region);
   region->regiontype = RGN_TYPE_UI;
   region->alignment = RGN_ALIGN_RIGHT;
-  region->flag = RGN_FLAG_HIDDEN;
 
   /* main region */
   region = MEM_callocN(sizeof(ARegion), "main region for action");
@@ -308,7 +307,7 @@ static void action_header_region_draw(const bContext *C, ARegion *region)
 static void action_channel_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -402,7 +401,7 @@ static void saction_channel_region_message_subscribe(const wmRegionMessageSubscr
 static void action_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -500,7 +499,7 @@ static void saction_main_region_message_subscribe(const wmRegionMessageSubscribe
 static void action_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceAction *saction = (SpaceAction *)area->spacedata.first;
 
   /* context changes */
@@ -654,7 +653,7 @@ static void action_header_region_listener(const wmRegionListenerParams *params)
 {
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceAction *saction = (SpaceAction *)area->spacedata.first;
 
   /* context changes */
@@ -729,7 +728,7 @@ static void action_buttons_area_draw(const bContext *C, ARegion *region)
 static void action_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -841,7 +840,7 @@ void ED_spacetype_action(void)
   ARegionType *art;
 
   st->spaceid = SPACE_ACTION;
-  strncpy(st->name, "Action", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Action");
 
   st->create = action_create;
   st->free = action_free;
@@ -906,5 +905,8 @@ void ED_spacetype_action(void)
 
   action_buttons_register(art);
 
+  art = ED_area_type_hud(st->spaceid);
+  BLI_addhead(&st->regiontypes, art);
+
   BKE_spacetype_register(st);
 }
diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index d53fe2efb03..3d964a95bc0 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -163,6 +163,7 @@ void ED_spacemacros_init(void)
   ED_operatormacros_sequencer();
   ED_operatormacros_paint();
   ED_operatormacros_gpencil();
+  ED_operatormacros_nla();
 
   /* Register dropboxes (can use macros). */
   ED_dropboxes_ui();
diff --git a/source/blender/editors/space_buttons/CMakeLists.txt b/source/blender/editors/space_buttons/CMakeLists.txt
index e2f1df74446..d0ad510f5cf 100644
--- a/source/blender/editors/space_buttons/CMakeLists.txt
+++ b/source/blender/editors/space_buttons/CMakeLists.txt
@@ -9,8 +9,8 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
+  ../../bmesh
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
 )
@@ -35,7 +35,6 @@ endif()
 if(WITH_EXPERIMENTAL_FEATURES)
   add_definitions(-DWITH_SIMULATION_DATABLOCK)
   add_definitions(-DWITH_POINT_CLOUD)
-  add_definitions(-DWITH_NEW_CURVES_TYPE)
 endif()
 
 blender_add_lib(bf_editor_space_buttons "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
diff --git a/source/blender/editors/space_buttons/buttons_context.c b/source/blender/editors/space_buttons/buttons_context.c
index 5780b0c9df7..3dc522ffcb9 100644
--- a/source/blender/editors/space_buttons/buttons_context.c
+++ b/source/blender/editors/space_buttons/buttons_context.c
@@ -155,7 +155,8 @@ static bool buttons_context_path_collection(const bContext *C,
   /* if we have a view layer, use the view layer's active collection */
   if (buttons_context_path_view_layer(path, window)) {
     ViewLayer *view_layer = path->ptr[path->len - 1].data;
-    Collection *c = view_layer->active_collection->collection;
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Collection *c = BKE_view_layer_active_collection_get(view_layer)->collection;
 
     /* Do not show collection tab for master collection. */
     if (c == scene->master_collection) {
@@ -209,7 +210,7 @@ static bool buttons_context_path_object(ButsContextPath *path)
   }
 
   ViewLayer *view_layer = ptr->data;
-  Object *ob = (view_layer->basact) ? view_layer->basact->object : NULL;
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   if (ob) {
     RNA_id_pointer_create(&ob->id, &path->ptr[path->len]);
@@ -258,11 +259,9 @@ static bool buttons_context_path_data(ButsContextPath *path, int type)
   if (RNA_struct_is_a(ptr->type, &RNA_GreasePencil) && (ELEM(type, -1, OB_GPENCIL))) {
     return true;
   }
-#ifdef WITH_NEW_CURVES_TYPE
   if (RNA_struct_is_a(ptr->type, &RNA_Curves) && (ELEM(type, -1, OB_CURVES))) {
     return true;
   }
-#endif
 #ifdef WITH_POINT_CLOUD
   if (RNA_struct_is_a(ptr->type, &RNA_PointCloud) && (ELEM(type, -1, OB_POINTCLOUD))) {
     return true;
@@ -644,8 +643,10 @@ static bool buttons_context_path(
 static bool buttons_shading_context(const bContext *C, int mainb)
 {
   wmWindow *window = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(window);
   ViewLayer *view_layer = WM_window_get_active_view_layer(window);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   if (ELEM(mainb, BCONTEXT_MATERIAL, BCONTEXT_WORLD, BCONTEXT_TEXTURE)) {
     return true;
@@ -660,8 +661,10 @@ static bool buttons_shading_context(const bContext *C, int mainb)
 static int buttons_shading_new_context(const bContext *C, int flag)
 {
   wmWindow *window = CTX_wm_window(C);
+  const Scene *scene = WM_window_get_active_scene(window);
   ViewLayer *view_layer = WM_window_get_active_view_layer(window);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   if (flag & (1 << BCONTEXT_MATERIAL)) {
     return BCONTEXT_MATERIAL;
@@ -830,9 +833,7 @@ const char *buttons_context_dir[] = {
     "line_style",
     "collection",
     "gpencil",
-#ifdef WITH_NEW_CURVES_TYPE
     "curves",
-#endif
 #ifdef WITH_POINT_CLOUD
     "pointcloud",
 #endif
@@ -926,12 +927,10 @@ int /*eContextResult*/ buttons_context(const bContext *C,
     set_pointer_type(path, result, &RNA_LightProbe);
     return CTX_RESULT_OK;
   }
-#ifdef WITH_NEW_CURVES_TYPE
   if (CTX_data_equals(member, "curves")) {
     set_pointer_type(path, result, &RNA_Curves);
     return CTX_RESULT_OK;
   }
-#endif
 #ifdef WITH_POINT_CLOUD
   if (CTX_data_equals(member, "pointcloud")) {
     set_pointer_type(path, result, &RNA_PointCloud);
diff --git a/source/blender/editors/space_buttons/buttons_intern.h b/source/blender/editors/space_buttons/buttons_intern.h
index 520d3a7c38d..1430cd4a8e8 100644
--- a/source/blender/editors/space_buttons/buttons_intern.h
+++ b/source/blender/editors/space_buttons/buttons_intern.h
@@ -26,7 +26,7 @@ struct SpaceProperties_Runtime {
   /** For filtering properties displayed in the space. */
   char search_string[UI_MAX_NAME_STR];
   /**
-   * Bitfield (in the same order as the tabs) for whether each tab has properties
+   * Bit-field (in the same order as the tabs) for whether each tab has properties
    * that match the search filter. Only valid when #search_string is set.
    */
   BLI_bitmap *tab_search_results;
diff --git a/source/blender/editors/space_buttons/buttons_ops.c b/source/blender/editors/space_buttons/buttons_ops.c
index 10fb008049d..a9ce9a3d723 100644
--- a/source/blender/editors/space_buttons/buttons_ops.c
+++ b/source/blender/editors/space_buttons/buttons_ops.c
@@ -337,6 +337,12 @@ static int file_browse_invoke(bContext *C, wmOperator *op, const wmEvent *event)
   RNA_string_set(op->ptr, path_prop, str);
   MEM_freeN(str);
 
+  PropertyRNA *prop_check_existing = RNA_struct_find_property(op->ptr, "check_existing");
+  if (!RNA_property_is_set(op->ptr, prop_check_existing)) {
+    const bool is_output_path = (RNA_property_flag(prop) & PROP_PATH_OUTPUT) != 0;
+    RNA_property_boolean_set(op->ptr, prop_check_existing, is_output_path);
+  }
+
   WM_event_add_fileselect(C, op);
 
   return OPERATOR_RUNNING_MODAL;
diff --git a/source/blender/editors/space_buttons/buttons_texture.c b/source/blender/editors/space_buttons/buttons_texture.c
index a5cb9170f98..d4e456272f9 100644
--- a/source/blender/editors/space_buttons/buttons_texture.c
+++ b/source/blender/editors/space_buttons/buttons_texture.c
@@ -281,7 +281,8 @@ static void buttons_texture_users_from_context(ListBase *users,
 
     brush = BKE_paint_brush(BKE_paint_get_active_from_context(C));
     linestyle = BKE_linestyle_active_from_view_layer(view_layer);
-    ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    ob = BKE_view_layer_active_object_get(view_layer);
   }
 
   /* fill users */
diff --git a/source/blender/editors/space_buttons/space_buttons.c b/source/blender/editors/space_buttons/space_buttons.c
index e60946b8f66..209d60d4f58 100644
--- a/source/blender/editors/space_buttons/space_buttons.c
+++ b/source/blender/editors/space_buttons/space_buttons.c
@@ -507,7 +507,7 @@ static void buttons_main_region_layout(const bContext *C, ARegion *region)
 static void buttons_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -603,7 +603,7 @@ static void buttons_navigation_bar_region_draw(const bContext *C, ARegion *regio
   }
 
   ED_region_panels_layout(C, region);
-  /* ED_region_panels_layout adds vertical scrollbars, we don't want them. */
+  /* #ED_region_panels_layout adds vertical scroll-bars, we don't want them. */
   region->v2d.scroll &= ~V2D_SCROLL_VERTICAL;
   ED_region_panels_draw(C, region);
 }
@@ -645,7 +645,7 @@ static void buttons_area_redraw(ScrArea *area, short buttons)
 static void buttons_area_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceProperties *sbuts = area->spacedata.first;
 
   /* context changes */
@@ -917,7 +917,7 @@ void ED_spacetype_buttons(void)
   ARegionType *art;
 
   st->spaceid = SPACE_PROPERTIES;
-  strncpy(st->name, "Buttons", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Buttons");
 
   st->create = buttons_create;
   st->free = buttons_free;
@@ -978,8 +978,7 @@ void ED_spacetype_buttons(void)
   /* regions: navigation bar */
   art = MEM_callocN(sizeof(ARegionType), "spacetype nav buttons region");
   art->regionid = RGN_TYPE_NAV_BAR;
-  art->prefsizex = AREAMINX - 3; /* XXX Works and looks best,
-                                  * should we update AREAMINX accordingly? */
+  art->prefsizex = AREAMINX;
   art->keymapflag = ED_KEYMAP_UI | ED_KEYMAP_FRAMES | ED_KEYMAP_NAVBAR;
   art->init = buttons_navigation_bar_region_init;
   art->draw = buttons_navigation_bar_region_draw;
diff --git a/source/blender/editors/space_clip/CMakeLists.txt b/source/blender/editors/space_clip/CMakeLists.txt
index eddf1780d8b..8cb5299df6d 100644
--- a/source/blender/editors/space_clip/CMakeLists.txt
+++ b/source/blender/editors/space_clip/CMakeLists.txt
@@ -13,7 +13,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 
   # dna_type_offsets.h
diff --git a/source/blender/editors/space_clip/clip_buttons.c b/source/blender/editors/space_clip/clip_buttons.c
index 72df2b74b11..3a4a2faa5f7 100644
--- a/source/blender/editors/space_clip/clip_buttons.c
+++ b/source/blender/editors/space_clip/clip_buttons.c
@@ -57,7 +57,7 @@ static void metadata_panel_context_draw(const bContext *C, Panel *panel)
   SpaceClip *space_clip = CTX_wm_space_clip(C);
   /* NOTE: This might not be exactly the same image buffer as shown in the
    * clip editor itself, since that might be coming from proxy, or being
-   * postprocessed (stabilized or undistored).
+   * postprocessed (stabilized or undistorted).
    * Ideally we need to query metadata from an original image or movie without
    * reading actual pixels to speed up the process. */
   ImBuf *ibuf = ED_space_clip_get_buffer(space_clip);
diff --git a/source/blender/editors/space_clip/clip_dopesheet_draw.c b/source/blender/editors/space_clip/clip_dopesheet_draw.c
index 858fa229992..8f876f6a8a3 100644
--- a/source/blender/editors/space_clip/clip_dopesheet_draw.c
+++ b/source/blender/editors/space_clip/clip_dopesheet_draw.c
@@ -111,7 +111,7 @@ void clip_draw_dopesheet_main(SpaceClip *sc, ARegion *region, Scene *scene)
 
     GPUVertFormat *format = immVertexFormat();
     uint pos_id = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* don't use totrect set, as the width stays the same
      * (NOTE: this is ok here, the configuration is pretty straightforward)
@@ -313,7 +313,7 @@ void clip_draw_dopesheet_channels(const bContext *C, ARegion *region)
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   MovieTrackingDopesheetChannel *channel;
   for (channel = dopesheet->channels.first; channel; channel = channel->next) {
diff --git a/source/blender/editors/space_clip/clip_draw.c b/source/blender/editors/space_clip/clip_draw.c
index 78174160eb8..b9bd97260ef 100644
--- a/source/blender/editors/space_clip/clip_draw.c
+++ b/source/blender/editors/space_clip/clip_draw.c
@@ -149,7 +149,7 @@ static void draw_movieclip_cache(SpaceClip *sc, ARegion *region, MovieClip *clip
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* track */
   if (act_track || act_plane_track) {
@@ -241,7 +241,7 @@ static void draw_movieclip_cache(SpaceClip *sc, ARegion *region, MovieClip *clip
   ED_region_cache_draw_curfra_label(sc->user.framenr, x, 8.0f * UI_DPI_FAC);
 
   pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* solver keyframes */
   immUniformColor4ub(175, 255, 0, 255);
@@ -286,7 +286,7 @@ static void draw_movieclip_muted(ARegion *region, int width, int height, float z
   int x, y;
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* find window pixel coordinates of origin */
   UI_view2d_view_to_region(&region->v2d, 0.0f, 0.0f, &x, &y);
@@ -364,7 +364,7 @@ static void draw_stabilization_border(
     GPU_matrix_scale_2f(zoomx, zoomy);
     GPU_matrix_mul(sc->stabmat);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -521,7 +521,7 @@ static void draw_track_path(SpaceClip *sc, MovieClip *UNUSED(clip), MovieTrackin
 
   const uint position_attribute = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw path outline. */
   if (!tiny) {
@@ -738,7 +738,7 @@ static void draw_marker_areas(SpaceClip *sc,
    * just always go with dashed shader. */
   immUnbindProgram();
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -865,7 +865,7 @@ static void draw_marker_areas(SpaceClip *sc,
   BLI_assert(pos == shdr_pos);
   UNUSED_VARS_NDEBUG(pos);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 }
 
 static float get_shortest_pattern_side(MovieTrackingMarker *marker)
@@ -1210,10 +1210,10 @@ static void draw_plane_marker_image(Scene *scene,
           imm_format, "texCoord", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
       /* Use 3D image for correct display of planar tracked images. */
-      immBindBuiltinProgram(GPU_SHADER_3D_IMAGE_MODULATE_ALPHA);
+      immBindBuiltinProgram(GPU_SHADER_3D_IMAGE_COLOR);
 
       immBindTexture("image", texture);
-      immUniform1f("alpha", plane_track->image_opacity);
+      immUniformColor4f(1.0f, 1.0f, 1.0f, plane_track->image_opacity);
 
       immBegin(GPU_PRIM_TRI_FAN, 4);
 
@@ -1278,7 +1278,7 @@ static void draw_plane_marker_ex(SpaceClip *sc,
     const uint shdr_pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -1358,7 +1358,7 @@ static void draw_plane_marker_ex(SpaceClip *sc,
 
     /* Draw sliders. */
     if (is_selected_track) {
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       if (draw_outline) {
         immUniformThemeColor(TH_MARKER_OUTLINE);
@@ -1525,7 +1525,7 @@ static void draw_tracking_tracks(SpaceClip *sc,
   uint position = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* markers outline and non-selected areas */
   track = tracksbase->first;
@@ -1720,7 +1720,7 @@ static void draw_distortion(SpaceClip *sc,
   uint position = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* grid */
   if (sc->flag & SC_SHOW_GRID) {
diff --git a/source/blender/editors/space_clip/clip_graph_draw.c b/source/blender/editors/space_clip/clip_graph_draw.c
index 7236e7bcee0..5e3171d03c9 100644
--- a/source/blender/editors/space_clip/clip_graph_draw.c
+++ b/source/blender/editors/space_clip/clip_graph_draw.c
@@ -259,7 +259,7 @@ void clip_draw_graph(SpaceClip *sc, ARegion *region, Scene *scene)
 
   if (clip) {
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     GPU_point_size(3.0f);
 
diff --git a/source/blender/editors/space_clip/clip_utils.c b/source/blender/editors/space_clip/clip_utils.c
index 221b87a8b5a..04b87cb4c83 100644
--- a/source/blender/editors/space_clip/clip_utils.c
+++ b/source/blender/editors/space_clip/clip_utils.c
@@ -614,7 +614,7 @@ void clip_draw_sfra_efra(View2D *v2d, Scene *scene)
   GPU_blend(GPU_BLEND_ALPHA);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4f(0.0f, 0.0f, 0.0f, 0.4f);
   immRectf(pos, v2d->cur.xmin, v2d->cur.ymin, (float)scene->r.sfra, v2d->cur.ymax);
diff --git a/source/blender/editors/space_clip/space_clip.c b/source/blender/editors/space_clip/space_clip.c
index ce6409a7784..ab952470757 100644
--- a/source/blender/editors/space_clip/space_clip.c
+++ b/source/blender/editors/space_clip/space_clip.c
@@ -314,7 +314,7 @@ static SpaceLink *clip_duplicate(SpaceLink *sl)
 static void clip_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   const Scene *scene = params->scene;
 
   /* context changes */
@@ -811,8 +811,8 @@ static void clip_main_region_draw(const bContext *C, ARegion *region)
   int width, height;
   bool show_cursor = false;
 
-  /* if tracking is in progress, we should synchronize framenr from clipuser
-   * so latest tracked frame would be shown */
+  /* If tracking is in progress, we should synchronize the frame from the clip-user
+   * (#MovieClipUser.framenr) so latest tracked frame would be shown. */
   if (clip && clip->tracking_context) {
     BKE_autotrack_context_sync_user(clip->tracking_context, &sc->user);
   }
@@ -919,7 +919,7 @@ static void clip_main_region_draw(const bContext *C, ARegion *region)
 static void clip_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1118,7 +1118,7 @@ static void clip_header_region_draw(const bContext *C, ARegion *region)
 static void clip_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1160,7 +1160,7 @@ static void clip_tools_region_draw(const bContext *C, ARegion *region)
 static void clip_props_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1212,7 +1212,7 @@ static void clip_properties_region_draw(const bContext *C, ARegion *region)
 static void clip_properties_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1251,7 +1251,7 @@ void ED_spacetype_clip(void)
   ARegionType *art;
 
   st->spaceid = SPACE_CLIP;
-  strncpy(st->name, "Clip", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Clip");
 
   st->create = clip_create;
   st->free = clip_free;
diff --git a/source/blender/editors/space_clip/tracking_ops.c b/source/blender/editors/space_clip/tracking_ops.c
index cba4157d044..0f5207b39c2 100644
--- a/source/blender/editors/space_clip/tracking_ops.c
+++ b/source/blender/editors/space_clip/tracking_ops.c
@@ -1535,6 +1535,7 @@ void CLIP_OT_average_tracks(wmOperatorType *ot)
   PropertyRNA *prop;
 
   prop = RNA_def_boolean(ot->srna, "keep_original", 1, "Keep Original", "Keep original tracks");
+  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_MOVIECLIP);
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
 
diff --git a/source/blender/editors/space_clip/tracking_ops_orient.c b/source/blender/editors/space_clip/tracking_ops_orient.c
index d3b818fba43..c6d4a6ad104 100644
--- a/source/blender/editors/space_clip/tracking_ops_orient.c
+++ b/source/blender/editors/space_clip/tracking_ops_orient.c
@@ -72,7 +72,8 @@ static Object *get_orientation_object(bContext *C)
     object = get_camera_with_movieclip(scene, clip);
   }
   else {
-    object = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    object = BKE_view_layer_active_object_get(view_layer);
   }
 
   if (object != NULL && object->parent != NULL) {
@@ -86,6 +87,7 @@ static bool set_orientation_poll(bContext *C)
 {
   SpaceClip *sc = CTX_wm_space_clip(C);
   if (sc != NULL) {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     MovieClip *clip = ED_space_clip_get_clip(sc);
     if (clip != NULL) {
@@ -94,7 +96,8 @@ static bool set_orientation_poll(bContext *C)
       if (tracking_object->flag & TRACKING_OBJECT_CAMERA) {
         return true;
       }
-      return OBACT(view_layer) != NULL;
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      return BKE_view_layer_active_object_get(view_layer) != NULL;
     }
   }
   return false;
diff --git a/source/blender/editors/space_console/CMakeLists.txt b/source/blender/editors/space_console/CMakeLists.txt
index 841c21f12e7..345ab8b0970 100644
--- a/source/blender/editors/space_console/CMakeLists.txt
+++ b/source/blender/editors/space_console/CMakeLists.txt
@@ -9,7 +9,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 )
 
diff --git a/source/blender/editors/space_console/console_draw.c b/source/blender/editors/space_console/console_draw.c
index 140dc4c1d40..6710d4ce0e7 100644
--- a/source/blender/editors/space_console/console_draw.c
+++ b/source/blender/editors/space_console/console_draw.c
@@ -150,7 +150,7 @@ static void console_textview_draw_cursor(TextViewContext *tvc, int cwidth, int c
   /* cursor */
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColor(TH_CONSOLE_CURSOR);
 
   immRectf(pos, pen[0] - U.pixelsize, pen[1], pen[0] + U.pixelsize, pen[1] + tvc->lheight);
diff --git a/source/blender/editors/space_console/console_intern.h b/source/blender/editors/space_console/console_intern.h
index deaaff05a33..8e2ebc9b8e9 100644
--- a/source/blender/editors/space_console/console_intern.h
+++ b/source/blender/editors/space_console/console_intern.h
@@ -15,7 +15,7 @@ struct wmOperatorType;
 /* console_draw.c */
 
 void console_textview_main(struct SpaceConsole *sc, const struct ARegion *region);
-/* needed to calculate the scrollbar */
+/* Needed to calculate the scroll-bar. */
 int console_textview_height(struct SpaceConsole *sc, const struct ARegion *region);
 int console_char_pick(struct SpaceConsole *sc, const struct ARegion *region, const int mval[2]);
 
diff --git a/source/blender/editors/space_console/console_ops.c b/source/blender/editors/space_console/console_ops.c
index 17fbef23eac..11234d446da 100644
--- a/source/blender/editors/space_console/console_ops.c
+++ b/source/blender/editors/space_console/console_ops.c
@@ -280,7 +280,7 @@ static bool console_line_column_from_index(
   return false;
 }
 
-/* static funcs for text editing */
+/* Static functions for text editing. */
 
 /* similar to the text editor, with some not used. keep compatible */
 static const EnumPropertyItem console_move_type_items[] = {
@@ -413,16 +413,8 @@ static int console_insert_invoke(bContext *C, wmOperator *op, const wmEvent *eve
     }
 
     char str[BLI_UTF8_MAX + 1];
-    size_t len;
-
-    if (event->utf8_buf[0]) {
-      len = BLI_str_utf8_size_safe(event->utf8_buf);
-      memcpy(str, event->utf8_buf, len);
-    }
-    else {
-      /* in theory, ghost can set value to extended ascii here */
-      len = BLI_str_utf8_from_unicode(event->ascii, str, sizeof(str) - 1);
-    }
+    const size_t len = BLI_str_utf8_size_safe(event->utf8_buf);
+    memcpy(str, event->utf8_buf, len);
     str[len] = '\0';
     RNA_string_set(op->ptr, "text", str);
   }
diff --git a/source/blender/editors/space_console/space_console.c b/source/blender/editors/space_console/space_console.c
index c69b73e377d..8838b5d341f 100644
--- a/source/blender/editors/space_console/space_console.c
+++ b/source/blender/editors/space_console/space_console.c
@@ -20,6 +20,7 @@
 #include "ED_space_api.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -124,6 +125,10 @@ static void console_main_region_init(wmWindowManager *wm, ARegion *region)
   keymap = WM_keymap_ensure(wm->defaultconf, "Console", SPACE_CONSOLE, 0);
   WM_event_add_keymap_handler_v2d_mask(&region->handlers, keymap);
 
+  /* Include after "Console" so cursor motion keys such as "Home" isn't overridden. */
+  keymap = WM_keymap_ensure(wm->defaultconf, "View2D Buttons List", 0, 0);
+  WM_event_add_keymap_handler(&region->handlers, keymap);
+
   /* add drop boxes */
   lb = WM_dropboxmap_find("Console", SPACE_CONSOLE, RGN_TYPE_WINDOW);
 
@@ -154,7 +159,7 @@ static void id_drop_copy(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
   ID *id = WM_drag_get_local_ID(drag, 0);
 
   /* copy drag path to properties */
-  char *text = RNA_path_full_ID_py(G_MAIN, id);
+  char *text = RNA_path_full_ID_py(id);
   RNA_string_set(drop->ptr, "text", text);
   MEM_freeN(text);
 }
@@ -256,7 +261,7 @@ static void console_main_region_listener(const wmRegionListenerParams *params)
 {
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -285,7 +290,7 @@ void ED_spacetype_console(void)
   ARegionType *art;
 
   st->spaceid = SPACE_CONSOLE;
-  strncpy(st->name, "Console", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Console");
 
   st->create = console_create;
   st->free = console_free;
diff --git a/source/blender/editors/space_file/CMakeLists.txt b/source/blender/editors/space_file/CMakeLists.txt
index b8c28e354da..fb9d5ab9b13 100644
--- a/source/blender/editors/space_file/CMakeLists.txt
+++ b/source/blender/editors/space_file/CMakeLists.txt
@@ -15,7 +15,6 @@ set(INC
   ../../render
   ../../windowmanager
   ../../../../intern/atomic
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -28,8 +27,9 @@ set(SRC
   file_ops.c
   file_panels.c
   file_utils.c
-  filelist.c
+  filelist.cc
   filesel.c
+  folder_history.cc
   fsmenu.c
   space_file.c
 
diff --git a/source/blender/editors/space_file/asset_catalog_tree_view.cc b/source/blender/editors/space_file/asset_catalog_tree_view.cc
index 87595ecdb88..1829f19bfd6 100644
--- a/source/blender/editors/space_file/asset_catalog_tree_view.cc
+++ b/source/blender/editors/space_file/asset_catalog_tree_view.cc
@@ -86,12 +86,12 @@ class AssetCatalogTreeViewItem : public ui::BasicTreeViewItem {
   bool rename(StringRefNull new_name) override;
 
   /** Add drag support for catalog items. */
-  std::unique_ptr<ui::AbstractTreeViewItemDragController> create_drag_controller() const override;
+  std::unique_ptr<ui::AbstractViewItemDragController> create_drag_controller() const override;
   /** Add dropping support for catalog items. */
-  std::unique_ptr<ui::AbstractTreeViewItemDropController> create_drop_controller() const override;
+  std::unique_ptr<ui::AbstractViewItemDropController> create_drop_controller() const override;
 };
 
-class AssetCatalogDragController : public ui::AbstractTreeViewItemDragController {
+class AssetCatalogDragController : public ui::AbstractViewItemDragController {
   AssetCatalogTreeItem &catalog_item_;
 
  public:
@@ -103,7 +103,7 @@ class AssetCatalogDragController : public ui::AbstractTreeViewItemDragController
   void on_drag_start() override;
 };
 
-class AssetCatalogDropController : public ui::AbstractTreeViewItemDropController {
+class AssetCatalogDropController : public ui::AbstractViewItemDropController {
   AssetCatalogTreeItem &catalog_item_;
 
  public:
@@ -142,7 +142,7 @@ class AssetCatalogTreeViewAllItem : public ui::BasicTreeViewItem {
 
   void build_row(uiLayout &row) override;
 
-  struct DropController : public ui::AbstractTreeViewItemDropController {
+  struct DropController : public ui::AbstractViewItemDropController {
     DropController(AssetCatalogTreeView &tree_view);
 
     bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const override;
@@ -150,13 +150,13 @@ class AssetCatalogTreeViewAllItem : public ui::BasicTreeViewItem {
     bool on_drop(struct bContext *C, const wmDrag &drag) override;
   };
 
-  std::unique_ptr<ui::AbstractTreeViewItemDropController> create_drop_controller() const override;
+  std::unique_ptr<ui::AbstractViewItemDropController> create_drop_controller() const override;
 };
 
 class AssetCatalogTreeViewUnassignedItem : public ui::BasicTreeViewItem {
   using BasicTreeViewItem::BasicTreeViewItem;
 
-  struct DropController : public ui::AbstractTreeViewItemDropController {
+  struct DropController : public ui::AbstractViewItemDropController {
     DropController(AssetCatalogTreeView &tree_view);
 
     bool can_drop(const wmDrag &drag, const char **r_disabled_hint) const override;
@@ -164,7 +164,7 @@ class AssetCatalogTreeViewUnassignedItem : public ui::BasicTreeViewItem {
     bool on_drop(struct bContext *C, const wmDrag &drag) override;
   };
 
-  std::unique_ptr<ui::AbstractTreeViewItemDropController> create_drop_controller() const override;
+  std::unique_ptr<ui::AbstractViewItemDropController> create_drop_controller() const override;
 };
 
 /* ---------------------------------------------------------------------- */
@@ -272,11 +272,11 @@ void AssetCatalogTreeViewItem::build_row(uiLayout &row)
     return;
   }
 
-  uiButTreeRow *tree_row_but = tree_row_button();
+  uiButViewItem *view_item_but = view_item_button();
   PointerRNA *props;
 
   props = UI_but_extra_operator_icon_add(
-      (uiBut *)tree_row_but, "ASSET_OT_catalog_new", WM_OP_INVOKE_DEFAULT, ICON_ADD);
+      (uiBut *)view_item_but, "ASSET_OT_catalog_new", WM_OP_INVOKE_DEFAULT, ICON_ADD);
   RNA_string_set(props, "parent_path", catalog_item_.catalog_path().c_str());
 }
 
@@ -305,7 +305,7 @@ void AssetCatalogTreeViewItem::build_context_menu(bContext &C, uiLayout &column)
               0,
               &props);
   RNA_string_set(&props, "catalog_id", catalog_id_str_buffer);
-  uiItemO(&column, "Rename", ICON_NONE, "UI_OT_tree_view_item_rename");
+  uiItemO(&column, "Rename", ICON_NONE, "UI_OT_view_item_rename");
 
   /* Doesn't actually exist right now, but could be defined in Python. Reason that this isn't done
    * in Python yet is that catalogs are not exposed in BPY, and we'd somehow pass the clicked on
@@ -333,14 +333,14 @@ bool AssetCatalogTreeViewItem::rename(StringRefNull new_name)
   return true;
 }
 
-std::unique_ptr<ui::AbstractTreeViewItemDropController> AssetCatalogTreeViewItem::
+std::unique_ptr<ui::AbstractViewItemDropController> AssetCatalogTreeViewItem::
     create_drop_controller() const
 {
   return std::make_unique<AssetCatalogDropController>(
       static_cast<AssetCatalogTreeView &>(get_tree_view()), catalog_item_);
 }
 
-std::unique_ptr<ui::AbstractTreeViewItemDragController> AssetCatalogTreeViewItem::
+std::unique_ptr<ui::AbstractViewItemDragController> AssetCatalogTreeViewItem::
     create_drag_controller() const
 {
   return std::make_unique<AssetCatalogDragController>(
@@ -351,7 +351,7 @@ std::unique_ptr<ui::AbstractTreeViewItemDragController> AssetCatalogTreeViewItem
 
 AssetCatalogDropController::AssetCatalogDropController(AssetCatalogTreeView &tree_view,
                                                        AssetCatalogTreeItem &catalog_item)
-    : ui::AbstractTreeViewItemDropController(tree_view), catalog_item_(catalog_item)
+    : ui::AbstractViewItemDropController(tree_view), catalog_item_(catalog_item)
 {
 }
 
@@ -422,10 +422,10 @@ bool AssetCatalogDropController::on_drop(struct bContext *C, const wmDrag &drag)
 {
   if (drag.type == WM_DRAG_ASSET_CATALOG) {
     return drop_asset_catalog_into_catalog(
-        drag, tree_view<AssetCatalogTreeView>(), catalog_item_.get_catalog_id());
+        drag, get_view<AssetCatalogTreeView>(), catalog_item_.get_catalog_id());
   }
   return drop_assets_into_catalog(C,
-                                  tree_view<AssetCatalogTreeView>(),
+                                  get_view<AssetCatalogTreeView>(),
                                   drag,
                                   catalog_item_.get_catalog_id(),
                                   catalog_item_.get_simple_name());
@@ -512,14 +512,14 @@ bool AssetCatalogDropController::has_droppable_asset(const wmDrag &drag,
 
 ::AssetLibrary &AssetCatalogDropController::get_asset_library() const
 {
-  return *tree_view<AssetCatalogTreeView>().asset_library_;
+  return *get_view<AssetCatalogTreeView>().asset_library_;
 }
 
 /* ---------------------------------------------------------------------- */
 
 AssetCatalogDragController::AssetCatalogDragController(AssetCatalogTreeView &tree_view,
                                                        AssetCatalogTreeItem &catalog_item)
-    : ui::AbstractTreeViewItemDragController(tree_view), catalog_item_(catalog_item)
+    : ui::AbstractViewItemDragController(tree_view), catalog_item_(catalog_item)
 {
 }
 
@@ -538,7 +538,7 @@ void *AssetCatalogDragController::create_drag_data() const
 
 void AssetCatalogDragController::on_drag_start()
 {
-  AssetCatalogTreeView &tree_view_ = tree_view<AssetCatalogTreeView>();
+  AssetCatalogTreeView &tree_view_ = get_view<AssetCatalogTreeView>();
   tree_view_.activate_catalog_by_id(catalog_item_.get_catalog_id());
 }
 
@@ -551,15 +551,15 @@ void AssetCatalogTreeViewAllItem::build_row(uiLayout &row)
   PointerRNA *props;
 
   UI_but_extra_operator_icon_add(
-      (uiBut *)tree_row_button(), "ASSET_OT_catalogs_save", WM_OP_INVOKE_DEFAULT, ICON_FILE_TICK);
+      (uiBut *)view_item_button(), "ASSET_OT_catalogs_save", WM_OP_INVOKE_DEFAULT, ICON_FILE_TICK);
 
   props = UI_but_extra_operator_icon_add(
-      (uiBut *)tree_row_button(), "ASSET_OT_catalog_new", WM_OP_INVOKE_DEFAULT, ICON_ADD);
+      (uiBut *)view_item_button(), "ASSET_OT_catalog_new", WM_OP_INVOKE_DEFAULT, ICON_ADD);
   /* No parent path to use the root level. */
   RNA_string_set(props, "parent_path", nullptr);
 }
 
-std::unique_ptr<ui::AbstractTreeViewItemDropController> AssetCatalogTreeViewAllItem::
+std::unique_ptr<ui::AbstractViewItemDropController> AssetCatalogTreeViewAllItem::
     create_drop_controller() const
 {
   return std::make_unique<AssetCatalogTreeViewAllItem::DropController>(
@@ -567,7 +567,7 @@ std::unique_ptr<ui::AbstractTreeViewItemDropController> AssetCatalogTreeViewAllI
 }
 
 AssetCatalogTreeViewAllItem::DropController::DropController(AssetCatalogTreeView &tree_view)
-    : ui::AbstractTreeViewItemDropController(tree_view)
+    : ui::AbstractViewItemDropController(tree_view)
 {
 }
 
@@ -579,7 +579,7 @@ bool AssetCatalogTreeViewAllItem::DropController::can_drop(const wmDrag &drag,
   }
 
   const AssetCatalog *drag_catalog = AssetCatalogDropController::get_drag_catalog(
-      drag, *tree_view<AssetCatalogTreeView>().asset_library_);
+      drag, *get_view<AssetCatalogTreeView>().asset_library_);
   if (drag_catalog->path.parent() == "") {
     *r_disabled_hint = "Catalog is already placed at the highest level";
     return false;
@@ -592,7 +592,7 @@ std::string AssetCatalogTreeViewAllItem::DropController::drop_tooltip(const wmDr
 {
   BLI_assert(drag.type == WM_DRAG_ASSET_CATALOG);
   const AssetCatalog *drag_catalog = AssetCatalogDropController::get_drag_catalog(
-      drag, *tree_view<AssetCatalogTreeView>().asset_library_);
+      drag, *get_view<AssetCatalogTreeView>().asset_library_);
 
   return std::string(TIP_("Move Catalog")) + " '" + drag_catalog->path.name() + "' " +
          TIP_("to the top level of the tree");
@@ -604,14 +604,14 @@ bool AssetCatalogTreeViewAllItem::DropController::on_drop(struct bContext *UNUSE
   BLI_assert(drag.type == WM_DRAG_ASSET_CATALOG);
   return AssetCatalogDropController::drop_asset_catalog_into_catalog(
       drag,
-      tree_view<AssetCatalogTreeView>(),
+      get_view<AssetCatalogTreeView>(),
       /* No value to drop into the root level. */
       std::nullopt);
 }
 
 /* ---------------------------------------------------------------------- */
 
-std::unique_ptr<ui::AbstractTreeViewItemDropController> AssetCatalogTreeViewUnassignedItem::
+std::unique_ptr<ui::AbstractViewItemDropController> AssetCatalogTreeViewUnassignedItem::
     create_drop_controller() const
 {
   return std::make_unique<AssetCatalogTreeViewUnassignedItem::DropController>(
@@ -619,7 +619,7 @@ std::unique_ptr<ui::AbstractTreeViewItemDropController> AssetCatalogTreeViewUnas
 }
 
 AssetCatalogTreeViewUnassignedItem::DropController::DropController(AssetCatalogTreeView &tree_view)
-    : ui::AbstractTreeViewItemDropController(tree_view)
+    : ui::AbstractViewItemDropController(tree_view)
 {
 }
 
@@ -647,7 +647,7 @@ bool AssetCatalogTreeViewUnassignedItem::DropController::on_drop(struct bContext
 {
   /* Assign to nil catalog ID. */
   return AssetCatalogDropController::drop_assets_into_catalog(
-      C, tree_view<AssetCatalogTreeView>(), drag, CatalogID{});
+      C, get_view<AssetCatalogTreeView>(), drag, CatalogID{});
 }
 
 }  // namespace blender::ed::asset_browser
diff --git a/source/blender/editors/space_file/file_draw.c b/source/blender/editors/space_file/file_draw.c
index f3359336b14..93eb5938301 100644
--- a/source/blender/editors/space_file/file_draw.c
+++ b/source/blender/editors/space_file/file_draw.c
@@ -378,7 +378,7 @@ static void file_draw_preview(const SpaceFile *sfile,
     GPU_blend(GPU_BLEND_ALPHA_PREMULT);
   }
 
-  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
   immDrawPixelsTexTiled_scaling(&state,
                                 (float)xco,
                                 (float)yco,
@@ -463,7 +463,7 @@ static void file_draw_preview(const SpaceFile *sfile,
   if (show_outline) {
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     float border_color[4] = {1.0f, 1.0f, 1.0f, 0.4f};
     float bgcolor[4];
     UI_GetThemeColor4fv(TH_BACK, bgcolor);
@@ -581,7 +581,7 @@ static void draw_background(FileLayout *layout, View2D *v2d)
   int sy;
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   float col_alternating[4];
   UI_GetThemeColor4fv(TH_ROW_ALTERNATE, col_alternating);
   immUniformThemeColorBlend(TH_BACK, TH_ROW_ALTERNATE, col_alternating[3]);
@@ -631,7 +631,7 @@ static void draw_dividers(FileLayout *layout, View2D *v2d)
     uint color = GPU_vertformat_attr_add(
         format, "color", GPU_COMP_U8, 3, GPU_FETCH_INT_TO_FLOAT_UNIT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
     immBegin(GPU_PRIM_LINES, vertex_len);
 
     sx = (int)v2d->tot.xmin;
@@ -660,7 +660,7 @@ static void draw_columnheader_background(const FileLayout *layout, const View2D
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColorShade(TH_BACK, 11);
 
   immRectf(pos,
@@ -712,7 +712,7 @@ static void draw_columnheader_columns(const FileSelectParams *params,
       uint pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       immUniformThemeColorShade(TH_BACK, -10);
       immBegin(GPU_PRIM_LINES, 2);
       immVertex2f(pos, sx - 1, sy - divider_pad);
@@ -727,7 +727,7 @@ static void draw_columnheader_columns(const FileSelectParams *params,
   /* Vertical separator lines line */
   {
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColorShade(TH_BACK, -10);
     immBegin(GPU_PRIM_LINES, 4);
     immVertex2f(pos, v2d->cur.xmin, sy);
diff --git a/source/blender/editors/space_file/file_intern.h b/source/blender/editors/space_file/file_intern.h
index 655a7983e2b..676fdff268e 100644
--- a/source/blender/editors/space_file/file_intern.h
+++ b/source/blender/editors/space_file/file_intern.h
@@ -95,11 +95,15 @@ int file_highlight_set(struct SpaceFile *sfile, struct ARegion *region, int mx,
  * Use to set the file selector path from some arbitrary source.
  */
 void file_sfile_filepath_set(struct SpaceFile *sfile, const char *filepath);
-void file_sfile_to_operator_ex(struct Main *bmain,
+void file_sfile_to_operator_ex(struct bContext *C,
+                               struct Main *bmain,
                                struct wmOperator *op,
                                struct SpaceFile *sfile,
                                char *filepath);
-void file_sfile_to_operator(struct Main *bmain, struct wmOperator *op, struct SpaceFile *sfile);
+void file_sfile_to_operator(struct bContext *C,
+                            struct Main *bmain,
+                            struct wmOperator *op,
+                            struct SpaceFile *sfile);
 
 void file_operator_to_sfile(struct Main *bmain, struct SpaceFile *sfile, struct wmOperator *op);
 
@@ -113,7 +117,7 @@ void fileselect_refresh_params(struct SpaceFile *sfile);
 /**
  * Sets #FileSelectParams.file (name of selected file)
  */
-void fileselect_file_set(SpaceFile *sfile, int index);
+void fileselect_file_set(struct bContext *C, SpaceFile *sfile, int index);
 bool file_attribute_column_type_enabled(const FileSelectParams *params,
                                         FileAttributeColumnType column);
 /**
@@ -181,6 +185,19 @@ void file_on_reload_callback_register(struct SpaceFile *sfile,
                                       onReloadFn callback,
                                       onReloadFnData custom_data);
 
+/* folder_history.cc */
+
+/* not listbase itself */
+void folderlist_free(struct ListBase *folderlist);
+void folderlist_popdir(struct ListBase *folderlist, char *dir);
+void folderlist_pushdir(struct ListBase *folderlist, const char *dir);
+const char *folderlist_peeklastdir(struct ListBase *folderlist);
+int folderlist_clear_next(struct SpaceFile *sfile);
+
+void folder_history_list_ensure_for_active_browse_mode(struct SpaceFile *sfile);
+void folder_history_list_free(struct SpaceFile *sfile);
+struct ListBase folder_history_list_duplicate(struct ListBase *listbase);
+
 /* file_panels.c */
 
 void file_tool_props_region_panels_register(struct ARegionType *art);
diff --git a/source/blender/editors/space_file/file_ops.c b/source/blender/editors/space_file/file_ops.c
index 62bdd583bc1..3f671fd44a1 100644
--- a/source/blender/editors/space_file/file_ops.c
+++ b/source/blender/editors/space_file/file_ops.c
@@ -213,7 +213,7 @@ static FileSelect file_select_do(bContext *C, int selected_idx, bool do_diropen)
     else {
       retval = FILE_SELECT_FILE;
     }
-    fileselect_file_set(sfile, selected_idx);
+    fileselect_file_set(C, sfile, selected_idx);
   }
   return retval;
 }
@@ -367,6 +367,39 @@ static FileSelect file_select(
 /** \} */
 
 /* -------------------------------------------------------------------- */
+/** \name Bookmark Utilities
+ * \{ */
+
+/**
+ * Local utility to write #BLENDER_BOOKMARK_FILE, reporting an error on failure.
+ */
+static bool fsmenu_write_file_and_refresh_or_report_error(struct FSMenu *fsmenu,
+                                                          ScrArea *area,
+                                                          ReportList *reports)
+{
+  /* NOTE: use warning instead of error here, because the bookmark operation may be part of
+   * other actions which should not cause the operator to fail entirely. */
+  const char *cfgdir = BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL);
+  if (UNLIKELY(!cfgdir)) {
+    BKE_report(reports, RPT_ERROR, "Unable to create configuration directory to write bookmarks");
+    return false;
+  }
+
+  char filepath[FILE_MAX];
+  BLI_join_dirfile(filepath, sizeof(filepath), cfgdir, BLENDER_BOOKMARK_FILE);
+  if (UNLIKELY(!fsmenu_write_file(fsmenu, filepath))) {
+    BKE_reportf(reports, RPT_ERROR, "Unable to open or write bookmark file \"%s\"", filepath);
+    return false;
+  }
+
+  ED_area_tag_refresh(area);
+  ED_area_tag_redraw(area);
+  return true;
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
 /** \name Box Select Operator
  * \{ */
 
@@ -451,7 +484,7 @@ static int file_box_select_modal(bContext *C, wmOperator *op, const wmEvent *eve
   else {
     params->highlight_file = -1;
     params->sel_first = params->sel_last = -1;
-    fileselect_file_set(sfile, params->active_file);
+    fileselect_file_set(C, sfile, params->active_file);
     file_select_deselect_all(sfile, FILE_SEL_HIGHLIGHTED);
     WM_event_add_notifier(C, NC_SPACE | ND_SPACE_FILE_PARAMS, NULL);
   }
@@ -669,7 +702,8 @@ void FILE_OT_select(wmOperatorType *ot)
 /**
  * \returns true if selection has changed
  */
-static bool file_walk_select_selection_set(wmWindow *win,
+static bool file_walk_select_selection_set(struct bContext *C,
+                                           wmWindow *win,
                                            ARegion *region,
                                            SpaceFile *sfile,
                                            const int direction,
@@ -775,7 +809,7 @@ static bool file_walk_select_selection_set(wmWindow *win,
   }
 
   BLI_assert(IN_RANGE(active, -1, numfiles));
-  fileselect_file_set(sfile, params->active_file);
+  fileselect_file_set(C, sfile, params->active_file);
 
   /* ensure newly selected file is inside viewbounds */
   file_ensure_inside_viewbounds(region, sfile, params->active_file);
@@ -856,7 +890,8 @@ static bool file_walk_select_do(bContext *C,
     }
   }
 
-  return file_walk_select_selection_set(win,
+  return file_walk_select_selection_set(C,
+                                        win,
                                         region,
                                         sfile,
                                         direction,
@@ -1053,19 +1088,17 @@ static int bookmark_select_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
   SpaceFile *sfile = CTX_wm_space_file(C);
-  PropertyRNA *prop;
 
-  if ((prop = RNA_struct_find_property(op->ptr, "dir"))) {
-    FileSelectParams *params = ED_fileselect_get_active_params(sfile);
-    char entry[256];
+  PropertyRNA *prop = RNA_struct_find_property(op->ptr, "dir");
+  FileSelectParams *params = ED_fileselect_get_active_params(sfile);
+  char entry[256];
 
-    RNA_property_string_get(op->ptr, prop, entry);
-    BLI_strncpy(params->dir, entry, sizeof(params->dir));
-    BLI_path_normalize_dir(BKE_main_blendfile_path(bmain), params->dir);
-    ED_file_change_dir(C);
+  RNA_property_string_get(op->ptr, prop, entry);
+  BLI_strncpy(params->dir, entry, sizeof(params->dir));
+  BLI_path_normalize_dir(BKE_main_blendfile_path(bmain), params->dir);
+  ED_file_change_dir(C);
 
-    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_FILE_LIST, NULL);
-  }
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_FILE_LIST, NULL);
 
   return OPERATOR_FINISHED;
 }
@@ -1095,7 +1128,7 @@ void FILE_OT_select_bookmark(wmOperatorType *ot)
 /** \name Add Bookmark Operator
  * \{ */
 
-static int bookmark_add_exec(bContext *C, wmOperator *UNUSED(op))
+static int bookmark_add_exec(bContext *C, wmOperator *op)
 {
   ScrArea *area = CTX_wm_area(C);
   SpaceFile *sfile = CTX_wm_space_file(C);
@@ -1103,19 +1136,11 @@ static int bookmark_add_exec(bContext *C, wmOperator *UNUSED(op))
   struct FileSelectParams *params = ED_fileselect_get_active_params(sfile);
 
   if (params->dir[0] != '\0') {
-    char name[FILE_MAX];
 
     fsmenu_insert_entry(
         fsmenu, FS_CATEGORY_BOOKMARKS, params->dir, NULL, ICON_FILE_FOLDER, FS_INSERT_SAVE);
-    BLI_join_dirfile(name,
-                     sizeof(name),
-                     BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                     BLENDER_BOOKMARK_FILE);
-    fsmenu_write_file(fsmenu, name);
+    fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
   }
-
-  ED_area_tag_refresh(area);
-  ED_area_tag_redraw(area);
   return OPERATOR_FINISHED;
 }
 
@@ -1146,27 +1171,11 @@ static int bookmark_delete_exec(bContext *C, wmOperator *op)
   int nentries = ED_fsmenu_get_nentries(fsmenu, FS_CATEGORY_BOOKMARKS);
 
   PropertyRNA *prop = RNA_struct_find_property(op->ptr, "index");
-
-  if (prop) {
-    int index;
-    if (RNA_property_is_set(op->ptr, prop)) {
-      index = RNA_property_int_get(op->ptr, prop);
-    }
-    else { /* if index unset, use active bookmark... */
-      index = sfile->bookmarknr;
-    }
-    if ((index > -1) && (index < nentries)) {
-      char name[FILE_MAX];
-
-      fsmenu_remove_entry(fsmenu, FS_CATEGORY_BOOKMARKS, index);
-      BLI_join_dirfile(name,
-                       sizeof(name),
-                       BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                       BLENDER_BOOKMARK_FILE);
-      fsmenu_write_file(fsmenu, name);
-      ED_area_tag_refresh(area);
-      ED_area_tag_redraw(area);
-    }
+  const int index = RNA_property_is_set(op->ptr, prop) ? RNA_property_int_get(op->ptr, prop) :
+                                                         sfile->bookmarknr;
+  if ((index > -1) && (index < nentries)) {
+    fsmenu_remove_entry(fsmenu, FS_CATEGORY_BOOKMARKS, index);
+    fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
   }
 
   return OPERATOR_FINISHED;
@@ -1197,7 +1206,7 @@ void FILE_OT_bookmark_delete(wmOperatorType *ot)
 /** \name Cleanup Bookmark Operator
  * \{ */
 
-static int bookmark_cleanup_exec(bContext *C, wmOperator *UNUSED(op))
+static int bookmark_cleanup_exec(bContext *C, wmOperator *op)
 {
   ScrArea *area = CTX_wm_area(C);
   struct FSMenu *fsmenu = ED_fsmenu_get();
@@ -1218,16 +1227,8 @@ static int bookmark_cleanup_exec(bContext *C, wmOperator *UNUSED(op))
   }
 
   if (changed) {
-    char name[FILE_MAX];
-
-    BLI_join_dirfile(name,
-                     sizeof(name),
-                     BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                     BLENDER_BOOKMARK_FILE);
-    fsmenu_write_file(fsmenu, name);
+    fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
     fsmenu_refresh_bookmarks_status(CTX_wm_manager(C), fsmenu);
-    ED_area_tag_refresh(area);
-    ED_area_tag_redraw(area);
   }
 
   return OPERATOR_FINISHED;
@@ -1269,8 +1270,6 @@ static int bookmark_move_exec(bContext *C, wmOperator *op)
   struct FSMenuEntry *fsmentry = ED_fsmenu_get_category(fsmenu, FS_CATEGORY_BOOKMARKS);
   const struct FSMenuEntry *fsmentry_org = fsmentry;
 
-  char fname[FILE_MAX];
-
   const int direction = RNA_enum_get(op->ptr, "direction");
   const int totitems = ED_fsmenu_get_nentries(fsmenu, FS_CATEGORY_BOOKMARKS);
   const int act_index = sfile->bookmarknr;
@@ -1306,13 +1305,8 @@ static int bookmark_move_exec(bContext *C, wmOperator *op)
   /* Need to update active bookmark number. */
   sfile->bookmarknr = new_index;
 
-  BLI_join_dirfile(fname,
-                   sizeof(fname),
-                   BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                   BLENDER_BOOKMARK_FILE);
-  fsmenu_write_file(fsmenu, fname);
+  fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
 
-  ED_area_tag_redraw(area);
   return OPERATOR_FINISHED;
 }
 
@@ -1352,21 +1346,16 @@ void FILE_OT_bookmark_move(wmOperatorType *ot)
 /** \name Reset Recent Blend Files Operator
  * \{ */
 
-static int reset_recent_exec(bContext *C, wmOperator *UNUSED(op))
+static int reset_recent_exec(bContext *C, wmOperator *op)
 {
   ScrArea *area = CTX_wm_area(C);
-  char name[FILE_MAX];
   struct FSMenu *fsmenu = ED_fsmenu_get();
 
   while (ED_fsmenu_get_entry(fsmenu, FS_CATEGORY_RECENT, 0) != NULL) {
     fsmenu_remove_entry(fsmenu, FS_CATEGORY_RECENT, 0);
   }
-  BLI_join_dirfile(name,
-                   sizeof(name),
-                   BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                   BLENDER_BOOKMARK_FILE);
-  fsmenu_write_file(fsmenu, name);
-  ED_area_tag_redraw(area);
+
+  fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
 
   return OPERATOR_FINISHED;
 }
@@ -1568,7 +1557,8 @@ void FILE_OT_cancel(struct wmOperatorType *ot)
 /** \name Operator Utilities
  * \{ */
 
-void file_sfile_to_operator_ex(Main *bmain, wmOperator *op, SpaceFile *sfile, char *filepath)
+void file_sfile_to_operator_ex(
+    bContext *C, Main *bmain, wmOperator *op, SpaceFile *sfile, char *filepath)
 {
   FileSelectParams *params = ED_fileselect_get_active_params(sfile);
   PropertyRNA *prop;
@@ -1582,14 +1572,27 @@ void file_sfile_to_operator_ex(Main *bmain, wmOperator *op, SpaceFile *sfile, ch
     }
   }
 
+  char value[FILE_MAX];
   if ((prop = RNA_struct_find_property(op->ptr, "filename"))) {
+    RNA_property_string_get(op->ptr, prop, value);
     RNA_property_string_set(op->ptr, prop, params->file);
+    if (RNA_property_update_check(prop) && !STREQ(params->file, value)) {
+      RNA_property_update(C, op->ptr, prop);
+    }
   }
   if ((prop = RNA_struct_find_property(op->ptr, "directory"))) {
+    RNA_property_string_get(op->ptr, prop, value);
     RNA_property_string_set(op->ptr, prop, params->dir);
+    if (RNA_property_update_check(prop) && !STREQ(params->dir, value)) {
+      RNA_property_update(C, op->ptr, prop);
+    }
   }
   if ((prop = RNA_struct_find_property(op->ptr, "filepath"))) {
+    RNA_property_string_get(op->ptr, prop, value);
     RNA_property_string_set(op->ptr, prop, filepath);
+    if (RNA_property_update_check(prop) && !STREQ(filepath, value)) {
+      RNA_property_update(C, op->ptr, prop);
+    }
   }
 
   /* some ops have multiple files to select */
@@ -1643,11 +1646,11 @@ void file_sfile_to_operator_ex(Main *bmain, wmOperator *op, SpaceFile *sfile, ch
     }
   }
 }
-void file_sfile_to_operator(Main *bmain, wmOperator *op, SpaceFile *sfile)
+void file_sfile_to_operator(bContext *C, Main *bmain, wmOperator *op, SpaceFile *sfile)
 {
   char filepath_dummy[FILE_MAX];
 
-  file_sfile_to_operator_ex(bmain, op, sfile, filepath_dummy);
+  file_sfile_to_operator_ex(C, bmain, op, sfile, filepath_dummy);
 }
 
 void file_operator_to_sfile(Main *bmain, SpaceFile *sfile, wmOperator *op)
@@ -1708,7 +1711,7 @@ void file_draw_check_ex(bContext *C, ScrArea *area)
   if (op) { /* fail on reload */
     if (op->type->check) {
       Main *bmain = CTX_data_main(C);
-      file_sfile_to_operator(bmain, op, sfile);
+      file_sfile_to_operator(C, bmain, op, sfile);
 
       /* redraw */
       if (op->type->check(C, op)) {
@@ -1793,17 +1796,19 @@ static bool file_execute(bContext *C, SpaceFile *sfile)
     }
     ED_file_change_dir(C);
   }
-  /* opening file - sends events now, so things get handled on windowqueue level */
+  /* Opening file, sends events now, so things get handled on window-queue level. */
   else if (sfile->op) {
+    ScrArea *area = CTX_wm_area(C);
+    struct FSMenu *fsmenu = ED_fsmenu_get();
     wmOperator *op = sfile->op;
     char filepath[FILE_MAX];
 
     sfile->op = NULL;
 
-    file_sfile_to_operator_ex(bmain, op, sfile, filepath);
+    file_sfile_to_operator_ex(C, bmain, op, sfile, filepath);
 
     if (BLI_exists(params->dir)) {
-      fsmenu_insert_entry(ED_fsmenu_get(),
+      fsmenu_insert_entry(fsmenu,
                           FS_CATEGORY_RECENT,
                           params->dir,
                           NULL,
@@ -1811,11 +1816,8 @@ static bool file_execute(bContext *C, SpaceFile *sfile)
                           FS_INSERT_SAVE | FS_INSERT_FIRST);
     }
 
-    BLI_join_dirfile(filepath,
-                     sizeof(filepath),
-                     BKE_appdir_folder_id_create(BLENDER_USER_CONFIG, NULL),
-                     BLENDER_BOOKMARK_FILE);
-    fsmenu_write_file(ED_fsmenu_get(), filepath);
+    fsmenu_write_file_and_refresh_or_report_error(fsmenu, area, op->reports);
+
     WM_event_fileselect_event(CTX_wm_manager(C), op, EVT_FILESELECT_EXEC);
   }
 
@@ -2268,7 +2270,7 @@ static int filepath_drop_exec(bContext *C, wmOperator *op)
     file_sfile_filepath_set(sfile, filepath);
 
     if (sfile->op) {
-      file_sfile_to_operator(bmain, sfile->op, sfile);
+      file_sfile_to_operator(C, bmain, sfile->op, sfile);
       file_draw_check(C);
     }
 
@@ -2327,7 +2329,6 @@ static int file_directory_new_exec(bContext *C, wmOperator *op)
   char name[FILE_MAXFILE];
   char path[FILE_MAX];
   bool generate_name = true;
-  PropertyRNA *prop;
 
   wmWindowManager *wm = CTX_wm_manager(C);
   SpaceFile *sfile = CTX_wm_space_file(C);
@@ -2341,7 +2342,8 @@ static int file_directory_new_exec(bContext *C, wmOperator *op)
 
   path[0] = '\0';
 
-  if ((prop = RNA_struct_find_property(op->ptr, "directory"))) {
+  {
+    PropertyRNA *prop = RNA_struct_find_property(op->ptr, "directory");
     RNA_property_string_get(op->ptr, prop, path);
     if (path[0] != '\0') {
       generate_name = false;
diff --git a/source/blender/editors/space_file/filelist.c b/source/blender/editors/space_file/filelist.cc
index 24e1faaf4c9..2b9b23620ee 100644
--- a/source/blender/editors/space_file/filelist.c
+++ b/source/blender/editors/space_file/filelist.cc
@@ -7,11 +7,11 @@
 
 /* global includes */
 
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
 #include <sys/stat.h>
-#include <time.h>
 
 #ifndef WIN32
 #  include <unistd.h>
@@ -79,183 +79,14 @@
 
 #define FILEDIR_NBR_ENTRIES_UNSET -1
 
-/* ----------------- FOLDERLIST (previous/next) -------------- */
-
-typedef struct FolderList {
-  struct FolderList *next, *prev;
-  char *foldername;
-} FolderList;
-
-void folderlist_popdir(struct ListBase *folderlist, char *dir)
-{
-  const char *prev_dir;
-  struct FolderList *folder;
-  folder = folderlist->last;
-
-  if (folder) {
-    /* remove the current directory */
-    MEM_freeN(folder->foldername);
-    BLI_freelinkN(folderlist, folder);
-
-    folder = folderlist->last;
-    if (folder) {
-      prev_dir = folder->foldername;
-      BLI_strncpy(dir, prev_dir, FILE_MAXDIR);
-    }
-  }
-  /* delete the folder next or use setdir directly before PREVIOUS OP */
-}
-
-void folderlist_pushdir(ListBase *folderlist, const char *dir)
-{
-  if (!dir[0]) {
-    return;
-  }
-
-  struct FolderList *folder, *previous_folder;
-  previous_folder = folderlist->last;
-
-  /* check if already exists */
-  if (previous_folder && previous_folder->foldername) {
-    if (BLI_path_cmp(previous_folder->foldername, dir) == 0) {
-      return;
-    }
-  }
-
-  /* create next folder element */
-  folder = MEM_mallocN(sizeof(*folder), __func__);
-  folder->foldername = BLI_strdup(dir);
-
-  /* add it to the end of the list */
-  BLI_addtail(folderlist, folder);
-}
-
-const char *folderlist_peeklastdir(ListBase *folderlist)
-{
-  struct FolderList *folder;
-
-  if (!folderlist->last) {
-    return NULL;
-  }
-
-  folder = folderlist->last;
-  return folder->foldername;
-}
-
-int folderlist_clear_next(struct SpaceFile *sfile)
-{
-  const FileSelectParams *params = ED_fileselect_get_active_params(sfile);
-  struct FolderList *folder;
-
-  /* if there is no folder_next there is nothing we can clear */
-  if (BLI_listbase_is_empty(sfile->folders_next)) {
-    return 0;
-  }
-
-  /* if previous_folder, next_folder or refresh_folder operators are executed
-   * it doesn't clear folder_next */
-  folder = sfile->folders_prev->last;
-  if ((!folder) || (BLI_path_cmp(folder->foldername, params->dir) == 0)) {
-    return 0;
-  }
-
-  /* eventually clear flist->folders_next */
-  return 1;
-}
-
-void folderlist_free(ListBase *folderlist)
-{
-  if (folderlist) {
-    FolderList *folder;
-    for (folder = folderlist->first; folder; folder = folder->next) {
-      MEM_freeN(folder->foldername);
-    }
-    BLI_freelistN(folderlist);
-  }
-}
-
-static ListBase folderlist_duplicate(ListBase *folderlist)
-{
-  ListBase folderlistn = {NULL};
-
-  BLI_duplicatelist(&folderlistn, folderlist);
-
-  for (FolderList *folder = folderlistn.first; folder; folder = folder->next) {
-    folder->foldername = MEM_dupallocN(folder->foldername);
-  }
-  return folderlistn;
-}
-
-/* ----------------- Folder-History (wraps/owns file list above) -------------- */
-
-static FileFolderHistory *folder_history_find(const SpaceFile *sfile, eFileBrowse_Mode browse_mode)
-{
-  LISTBASE_FOREACH (FileFolderHistory *, history, &sfile->folder_histories) {
-    if (history->browse_mode == browse_mode) {
-      return history;
-    }
-  }
-
-  return NULL;
-}
-
-void folder_history_list_ensure_for_active_browse_mode(SpaceFile *sfile)
-{
-  FileFolderHistory *history = folder_history_find(sfile, sfile->browse_mode);
-
-  if (!history) {
-    history = MEM_callocN(sizeof(*history), __func__);
-    history->browse_mode = sfile->browse_mode;
-    BLI_addtail(&sfile->folder_histories, history);
-  }
-
-  sfile->folders_next = &history->folders_next;
-  sfile->folders_prev = &history->folders_prev;
-}
-
-static void folder_history_entry_free(SpaceFile *sfile, FileFolderHistory *history)
-{
-  if (sfile->folders_prev == &history->folders_prev) {
-    sfile->folders_prev = NULL;
-  }
-  if (sfile->folders_next == &history->folders_next) {
-    sfile->folders_next = NULL;
-  }
-  folderlist_free(&history->folders_prev);
-  folderlist_free(&history->folders_next);
-  BLI_freelinkN(&sfile->folder_histories, history);
-}
-
-void folder_history_list_free(SpaceFile *sfile)
-{
-  LISTBASE_FOREACH_MUTABLE (FileFolderHistory *, history, &sfile->folder_histories) {
-    folder_history_entry_free(sfile, history);
-  }
-}
-
-ListBase folder_history_list_duplicate(ListBase *listbase)
-{
-  ListBase histories = {NULL};
-
-  LISTBASE_FOREACH (FileFolderHistory *, history, listbase) {
-    FileFolderHistory *history_new = MEM_dupallocN(history);
-    history_new->folders_prev = folderlist_duplicate(&history->folders_prev);
-    history_new->folders_next = folderlist_duplicate(&history->folders_next);
-    BLI_addtail(&histories, history_new);
-  }
-
-  return histories;
-}
-
 /* ------------------FILELIST------------------------ */
 
-typedef struct FileListInternEntry {
-  struct FileListInternEntry *next, *prev;
+struct FileListInternEntry {
+  FileListInternEntry *next, *prev;
 
   FileUID uid;
 
-  /** eFileSel_File_Types */
-  int typeflag;
+  eFileSel_File_Types typeflag;
   /** ID type, in case typeflag has FILE_TYPE_BLENDERLIB set. */
   int blentype;
 
@@ -287,18 +118,18 @@ typedef struct FileListInternEntry {
   /** Defined in BLI_fileops.h */
   eFileAttributes attributes;
   BLI_stat_t st;
-} FileListInternEntry;
+};
 
-typedef struct FileListIntern {
+struct FileListIntern {
   /** FileListInternEntry items. */
   ListBase entries;
   FileListInternEntry **filtered;
 
   FileUID curr_uid; /* Used to generate UID during internal listing. */
-} FileListIntern;
+};
 
 #define FILELIST_ENTRYCACHESIZE_DEFAULT 1024 /* Keep it a power of two! */
-typedef struct FileListEntryCache {
+struct FileListEntryCache {
   size_t size; /* The size of the cache... */
 
   int flags;
@@ -327,7 +158,7 @@ typedef struct FileListEntryCache {
    * previews either in `previews_pool` or `previews_done`. #filelist_cache_previews_update() makes
    * previews in `preview_done` ready for display, so the counter is decremented there. */
   int previews_todo_count;
-} FileListEntryCache;
+};
 
 /** #FileListCache.flags */
 enum {
@@ -335,21 +166,21 @@ enum {
   FLC_PREVIEWS_ACTIVE = 1 << 1,
 };
 
-typedef struct FileListEntryPreview {
+struct FileListEntryPreview {
   char filepath[FILE_MAX];
   uint flags;
   int index;
   int attributes; /* from FileDirEntry. */
   int icon_id;
-} FileListEntryPreview;
+};
 
 /* Dummy wrapper around FileListEntryPreview to ensure we do not access freed memory when freeing
  * tasks' data (see T74609). */
-typedef struct FileListEntryPreviewTaskData {
+struct FileListEntryPreviewTaskData {
   FileListEntryPreview *preview;
-} FileListEntryPreviewTaskData;
+};
 
-typedef struct FileListFilter {
+struct FileListFilter {
   uint64_t filter;
   uint64_t filter_id;
   char filter_glob[FILE_MAXFILE];
@@ -357,7 +188,7 @@ typedef struct FileListFilter {
   short flags;
 
   FileAssetCatalogFilterSettingsHandle *asset_catalog_filter;
-} FileListFilter;
+};
 
 /** #FileListFilter.flags */
 enum {
@@ -369,13 +200,13 @@ enum {
 };
 
 struct FileListReadJob;
-typedef struct FileList {
+struct FileList {
   FileDirEntryArr filelist;
 
   eFileSelectType type;
   /* The library this list was created for. Stored here so we know when to re-read. */
   AssetLibraryReference *asset_library_ref;
-  struct AssetLibrary *asset_library; /* Non-owning pointer. */
+  AssetLibrary *asset_library; /* Non-owning pointer. */
 
   short flags;
 
@@ -386,11 +217,11 @@ typedef struct FileList {
   /**
    * File indexer to use. Attribute is always set.
    */
-  const struct FileIndexerType *indexer;
+  const FileIndexerType *indexer;
 
-  struct FileListIntern filelist_intern;
+  FileListIntern filelist_intern;
 
-  struct FileListEntryCache filelist_cache;
+  FileListEntryCache filelist_cache;
 
   /* We need to keep those info outside of actual filelist items,
    * because those are no more persistent
@@ -403,7 +234,7 @@ typedef struct FileList {
   short max_recursion;
   short recursion_level;
 
-  struct BlendHandle *libfiledata;
+  BlendHandle *libfiledata;
 
   /* Set given path as root directory,
    * if last bool is true may change given string in place to a valid value.
@@ -419,7 +250,7 @@ typedef struct FileList {
   void (*prepare_filter_fn)(const struct FileList *, FileListFilter *);
 
   short tags; /* FileListTags */
-} FileList;
+};
 
 /** #FileList.flags */
 enum {
@@ -459,23 +290,23 @@ enum {
 
 static ImBuf *gSpecialFileImages[SPECIAL_IMG_MAX];
 
-static void filelist_readjob_main(struct FileListReadJob *job_params,
+static void filelist_readjob_main(FileListReadJob *job_params,
                                   short *stop,
                                   short *do_update,
                                   float *progress);
-static void filelist_readjob_lib(struct FileListReadJob *job_params,
+static void filelist_readjob_lib(FileListReadJob *job_params,
                                  short *stop,
                                  short *do_update,
                                  float *progress);
-static void filelist_readjob_dir(struct FileListReadJob *job_params,
+static void filelist_readjob_dir(FileListReadJob *job_params,
                                  short *stop,
                                  short *do_update,
                                  float *progress);
-static void filelist_readjob_asset_library(struct FileListReadJob *job_params,
+static void filelist_readjob_asset_library(FileListReadJob *job_params,
                                            short *stop,
                                            short *do_update,
                                            float *progress);
-static void filelist_readjob_main_assets(struct FileListReadJob *job_params,
+static void filelist_readjob_main_assets(FileListReadJob *job_params,
                                          short *stop,
                                          short *do_update,
                                          float *progress);
@@ -493,7 +324,7 @@ struct FileSortData {
   bool inverted;
 };
 
-static int compare_apply_inverted(int val, const struct FileSortData *sort_data)
+static int compare_apply_inverted(int val, const FileSortData *sort_data)
 {
   return sort_data->inverted ? -val : val;
 }
@@ -602,9 +433,9 @@ static int compare_direntry_generic(const FileListInternEntry *entry1,
 
 static int compare_name(void *user_data, const void *a1, const void *a2)
 {
-  const FileListInternEntry *entry1 = a1;
-  const FileListInternEntry *entry2 = a2;
-  const struct FileSortData *sort_data = user_data;
+  const FileListInternEntry *entry1 = static_cast<const FileListInternEntry *>(a1);
+  const FileListInternEntry *entry2 = static_cast<const FileListInternEntry *>(a2);
+  const FileSortData *sort_data = static_cast<const FileSortData *>(user_data);
 
   int ret;
   if ((ret = compare_direntry_generic(entry1, entry2))) {
@@ -616,9 +447,9 @@ static int compare_name(void *user_data, const void *a1, const void *a2)
 
 static int compare_date(void *user_data, const void *a1, const void *a2)
 {
-  const FileListInternEntry *entry1 = a1;
-  const FileListInternEntry *entry2 = a2;
-  const struct FileSortData *sort_data = user_data;
+  const FileListInternEntry *entry1 = static_cast<const FileListInternEntry *>(a1);
+  const FileListInternEntry *entry2 = static_cast<const FileListInternEntry *>(a2);
+  const FileSortData *sort_data = static_cast<const FileSortData *>(user_data);
   int64_t time1, time2;
 
   int ret;
@@ -640,9 +471,9 @@ static int compare_date(void *user_data, const void *a1, const void *a2)
 
 static int compare_size(void *user_data, const void *a1, const void *a2)
 {
-  const FileListInternEntry *entry1 = a1;
-  const FileListInternEntry *entry2 = a2;
-  const struct FileSortData *sort_data = user_data;
+  const FileListInternEntry *entry1 = static_cast<const FileListInternEntry *>(a1);
+  const FileListInternEntry *entry2 = static_cast<const FileListInternEntry *>(a2);
+  const FileSortData *sort_data = static_cast<const FileSortData *>(user_data);
   uint64_t size1, size2;
   int ret;
 
@@ -664,9 +495,9 @@ static int compare_size(void *user_data, const void *a1, const void *a2)
 
 static int compare_extension(void *user_data, const void *a1, const void *a2)
 {
-  const FileListInternEntry *entry1 = a1;
-  const FileListInternEntry *entry2 = a2;
-  const struct FileSortData *sort_data = user_data;
+  const FileListInternEntry *entry1 = static_cast<const FileListInternEntry *>(a1);
+  const FileListInternEntry *entry2 = static_cast<const FileListInternEntry *>(a2);
+  const FileSortData *sort_data = static_cast<const FileSortData *>(user_data);
   int ret;
 
   if ((ret = compare_direntry_generic(entry1, entry2))) {
@@ -720,7 +551,7 @@ static int compare_extension(void *user_data, const void *a1, const void *a2)
 void filelist_sort(struct FileList *filelist)
 {
   if (filelist->flags & FL_NEED_SORTING) {
-    void *sort_cb = NULL;
+    int (*sort_cb)(void *, const void *, const void *) = nullptr;
 
     switch (filelist->sort) {
       case FILE_SORT_ALPHA:
@@ -740,10 +571,10 @@ void filelist_sort(struct FileList *filelist)
         BLI_assert(0);
         break;
     }
-    BLI_listbase_sort_r(
-        &filelist->filelist_intern.entries,
-        sort_cb,
-        &(struct FileSortData){.inverted = (filelist->flags & FL_SORT_INVERT) != 0});
+
+    FileSortData sort_data{0};
+    sort_data.inverted = (filelist->flags & FL_SORT_INVERT) != 0;
+    BLI_listbase_sort_r(&filelist->filelist_intern.entries, sort_cb, &sort_data);
 
     filelist_tag_needs_filtering(filelist);
     filelist->flags &= ~FL_NEED_SORTING;
@@ -1062,7 +893,7 @@ void filelist_filter(FileList *filelist)
 {
   int num_filtered = 0;
   const int num_files = filelist->filelist.entries_num;
-  FileListInternEntry **filtered_tmp, *file;
+  FileListInternEntry **filtered_tmp;
 
   if (ELEM(filelist->filelist.entries_num, FILEDIR_NBR_ENTRIES_UNSET, 0)) {
     return;
@@ -1087,10 +918,11 @@ void filelist_filter(FileList *filelist)
     filelist->prepare_filter_fn(filelist, &filelist->filter_data);
   }
 
-  filtered_tmp = MEM_mallocN(sizeof(*filtered_tmp) * (size_t)num_files, __func__);
+  filtered_tmp = static_cast<FileListInternEntry **>(
+      MEM_mallocN(sizeof(*filtered_tmp) * (size_t)num_files, __func__));
 
   /* Filter remap & count how many files are left after filter in a single loop. */
-  for (file = filelist->filelist_intern.entries.first; file; file = file->next) {
+  LISTBASE_FOREACH (FileListInternEntry *, file, &filelist->filelist_intern.entries) {
     if (filelist->filter_fn(file, filelist->filelist.root, &filelist->filter_data)) {
       filtered_tmp[num_filtered++] = file;
     }
@@ -1099,8 +931,8 @@ void filelist_filter(FileList *filelist)
   if (filelist->filelist_intern.filtered) {
     MEM_freeN(filelist->filelist_intern.filtered);
   }
-  filelist->filelist_intern.filtered = MEM_mallocN(
-      sizeof(*filelist->filelist_intern.filtered) * (size_t)num_filtered, __func__);
+  filelist->filelist_intern.filtered = static_cast<FileListInternEntry **>(
+      MEM_mallocN(sizeof(*filelist->filelist_intern.filtered) * (size_t)num_filtered, __func__));
   memcpy(filelist->filelist_intern.filtered,
          filtered_tmp,
          sizeof(*filelist->filelist_intern.filtered) * (size_t)num_filtered);
@@ -1228,8 +1060,7 @@ void filelist_setlibrary(FileList *filelist, const AssetLibraryReference *asset_
   }
 
   if (!filelist->asset_library_ref) {
-    filelist->asset_library_ref = MEM_mallocN(sizeof(*filelist->asset_library_ref),
-                                              "filelist asset library");
+    filelist->asset_library_ref = MEM_new<AssetLibraryReference>("filelist asset library");
     *filelist->asset_library_ref = *asset_library_ref;
 
     filelist->flags |= FL_FORCE_RESET;
@@ -1335,7 +1166,7 @@ static int filelist_geticon_ex(const FileDirEntry *file,
                                const bool is_main,
                                const bool ignore_libdir)
 {
-  const eFileSel_File_Types typeflag = file->typeflag;
+  const eFileSel_File_Types typeflag = (eFileSel_File_Types)file->typeflag;
 
   if ((typeflag & FILE_TYPE_DIR) &&
       !(ignore_libdir && (typeflag & (FILE_TYPE_BLENDERLIB | FILE_TYPE_BLENDER)))) {
@@ -1581,10 +1412,7 @@ static void filelist_intern_entry_free(FileListInternEntry *entry)
 
 static void filelist_intern_free(FileListIntern *filelist_intern)
 {
-  FileListInternEntry *entry, *entry_next;
-
-  for (entry = filelist_intern->entries.first; entry; entry = entry_next) {
-    entry_next = entry->next;
+  LISTBASE_FOREACH_MUTABLE (FileListInternEntry *, entry, &filelist_intern->entries) {
     filelist_intern_entry_free(entry);
   }
   BLI_listbase_clear(&filelist_intern->entries);
@@ -1614,11 +1442,14 @@ static int filelist_intern_free_main_files(FileListIntern *filelist_intern)
 
 static void filelist_cache_preview_runf(TaskPool *__restrict pool, void *taskdata)
 {
-  FileListEntryCache *cache = BLI_task_pool_user_data(pool);
-  FileListEntryPreviewTaskData *preview_taskdata = taskdata;
+  FileListEntryCache *cache = static_cast<FileListEntryCache *>(BLI_task_pool_user_data(pool));
+  FileListEntryPreviewTaskData *preview_taskdata = static_cast<FileListEntryPreviewTaskData *>(
+      taskdata);
   FileListEntryPreview *preview = preview_taskdata->preview;
 
-  ThumbSource source = 0;
+  /* XXX #THB_SOURCE_IMAGE for "historic" reasons. The case of an undefined source should be
+   * handled better. */
+  ThumbSource source = THB_SOURCE_IMAGE;
 
   //  printf("%s: Start (%d)...\n", __func__, threadid);
 
@@ -1662,7 +1493,8 @@ static void filelist_cache_preview_runf(TaskPool *__restrict pool, void *taskdat
 
 static void filelist_cache_preview_freef(TaskPool *__restrict UNUSED(pool), void *taskdata)
 {
-  FileListEntryPreviewTaskData *preview_taskdata = taskdata;
+  FileListEntryPreviewTaskData *preview_taskdata = static_cast<FileListEntryPreviewTaskData *>(
+      taskdata);
 
   /* In case the preview wasn't moved to the "done" queue yet. */
   if (preview_taskdata->preview) {
@@ -1689,7 +1521,8 @@ static void filelist_cache_previews_clear(FileListEntryCache *cache)
     BLI_task_pool_cancel(cache->previews_pool);
 
     FileListEntryPreview *preview;
-    while ((preview = BLI_thread_queue_pop_timeout(cache->previews_done, 0))) {
+    while ((preview = static_cast<FileListEntryPreview *>(
+                BLI_thread_queue_pop_timeout(cache->previews_done, 0)))) {
       // printf("%s: DONE %d - %s - %p\n", __func__, preview->index, preview->path,
       // preview->img);
       if (preview->icon_id) {
@@ -1749,7 +1582,7 @@ static void filelist_cache_previews_push(FileList *filelist, FileDirEntry *entry
   filelist_cache_preview_ensure_running(cache);
   entry->flags |= FILE_ENTRY_PREVIEW_LOADING;
 
-  FileListEntryPreview *preview = MEM_mallocN(sizeof(*preview), __func__);
+  FileListEntryPreview *preview = MEM_new<FileListEntryPreview>(__func__);
   preview->index = index;
   preview->flags = entry->typeflag;
   preview->attributes = entry->attributes;
@@ -1775,8 +1608,8 @@ static void filelist_cache_previews_push(FileList *filelist, FileDirEntry *entry
     }
     // printf("%s: %d - %s\n", __func__, preview->index, preview->filepath);
 
-    FileListEntryPreviewTaskData *preview_taskdata = MEM_mallocN(sizeof(*preview_taskdata),
-                                                                 __func__);
+    FileListEntryPreviewTaskData *preview_taskdata = MEM_new<FileListEntryPreviewTaskData>(
+        __func__);
     preview_taskdata->preview = preview;
     BLI_task_pool_push(cache->previews_pool,
                        filelist_cache_preview_runf,
@@ -1793,11 +1626,12 @@ static void filelist_cache_init(FileListEntryCache *cache, size_t cache_size)
 
   cache->block_cursor = cache->block_start_index = cache->block_center_index =
       cache->block_end_index = 0;
-  cache->block_entries = MEM_mallocN(sizeof(*cache->block_entries) * cache_size, __func__);
+  cache->block_entries = static_cast<FileDirEntry **>(
+      MEM_mallocN(sizeof(*cache->block_entries) * cache_size, __func__));
 
   cache->misc_entries = BLI_ghash_ptr_new_ex(__func__, cache_size);
-  cache->misc_entries_indices = MEM_mallocN(sizeof(*cache->misc_entries_indices) * cache_size,
-                                            __func__);
+  cache->misc_entries_indices = static_cast<int *>(
+      MEM_mallocN(sizeof(*cache->misc_entries_indices) * cache_size, __func__));
   copy_vn_i(cache->misc_entries_indices, cache_size, -1);
   cache->misc_cursor = 0;
 
@@ -1815,8 +1649,6 @@ static void filelist_cache_init(FileListEntryCache *cache, size_t cache_size)
 
 static void filelist_cache_free(FileListEntryCache *cache)
 {
-  FileDirEntry *entry, *entry_next;
-
   if (!(cache->flags & FLC_IS_INIT)) {
     return;
   }
@@ -1830,8 +1662,7 @@ static void filelist_cache_free(FileListEntryCache *cache)
 
   BLI_ghash_free(cache->uids, NULL, NULL);
 
-  for (entry = cache->cached_entries.first; entry; entry = entry_next) {
-    entry_next = entry->next;
+  LISTBASE_FOREACH_MUTABLE (FileDirEntry *, entry, &cache->cached_entries) {
     filelist_entry_free(entry);
   }
   BLI_listbase_clear(&cache->cached_entries);
@@ -1839,8 +1670,6 @@ static void filelist_cache_free(FileListEntryCache *cache)
 
 static void filelist_cache_clear(FileListEntryCache *cache, size_t new_size)
 {
-  FileDirEntry *entry, *entry_next;
-
   if (!(cache->flags & FLC_IS_INIT)) {
     return;
   }
@@ -1850,14 +1679,14 @@ static void filelist_cache_clear(FileListEntryCache *cache, size_t new_size)
   cache->block_cursor = cache->block_start_index = cache->block_center_index =
       cache->block_end_index = 0;
   if (new_size != cache->size) {
-    cache->block_entries = MEM_reallocN(cache->block_entries,
-                                        sizeof(*cache->block_entries) * new_size);
+    cache->block_entries = static_cast<FileDirEntry **>(
+        MEM_reallocN(cache->block_entries, sizeof(*cache->block_entries) * new_size));
   }
 
   BLI_ghash_clear_ex(cache->misc_entries, NULL, NULL, new_size);
   if (new_size != cache->size) {
-    cache->misc_entries_indices = MEM_reallocN(cache->misc_entries_indices,
-                                               sizeof(*cache->misc_entries_indices) * new_size);
+    cache->misc_entries_indices = static_cast<int *>(MEM_reallocN(
+        cache->misc_entries_indices, sizeof(*cache->misc_entries_indices) * new_size));
   }
   copy_vn_i(cache->misc_entries_indices, new_size, -1);
 
@@ -1865,8 +1694,7 @@ static void filelist_cache_clear(FileListEntryCache *cache, size_t new_size)
 
   cache->size = new_size;
 
-  for (entry = cache->cached_entries.first; entry; entry = entry_next) {
-    entry_next = entry->next;
+  LISTBASE_FOREACH_MUTABLE (FileDirEntry *, entry, &cache->cached_entries) {
     filelist_entry_free(entry);
   }
   BLI_listbase_clear(&cache->cached_entries);
@@ -1874,7 +1702,7 @@ static void filelist_cache_clear(FileListEntryCache *cache, size_t new_size)
 
 FileList *filelist_new(short type)
 {
-  FileList *p = MEM_callocN(sizeof(*p), __func__);
+  FileList *p = MEM_cnew<FileList>(__func__);
 
   filelist_cache_init(&p->filelist_cache, FILELIST_ENTRYCACHESIZE_DEFAULT);
 
@@ -1891,7 +1719,7 @@ void filelist_settype(FileList *filelist, short type)
     return;
   }
 
-  filelist->type = type;
+  filelist->type = (eFileSelectType)type;
   filelist->tags = 0;
   filelist->indexer = &file_indexer_noop;
   switch (filelist->type) {
@@ -2181,7 +2009,7 @@ static FileDirEntry *filelist_file_create_entry(FileList *filelist, const int in
   FileListEntryCache *cache = &filelist->filelist_cache;
   FileDirEntry *ret;
 
-  ret = MEM_callocN(sizeof(*ret), __func__);
+  ret = MEM_cnew<FileDirEntry>(__func__);
 
   ret->size = (uint64_t)entry->st.st_size;
   ret->time = (int64_t)entry->st.st_mtime;
@@ -2240,7 +2068,8 @@ FileDirEntry *filelist_file_ex(struct FileList *filelist, const int index, const
     return cache->block_entries[idx];
   }
 
-  if ((ret = BLI_ghash_lookup(cache->misc_entries, POINTER_FROM_INT(index)))) {
+  if ((ret = static_cast<FileDirEntry *>(
+           BLI_ghash_lookup(cache->misc_entries, POINTER_FROM_INT(index))))) {
     return ret;
   }
 
@@ -2253,7 +2082,8 @@ FileDirEntry *filelist_file_ex(struct FileList *filelist, const int index, const
   /* Else, we have to add new entry to 'misc' cache - and possibly make room for it first! */
   ret = filelist_file_create_entry(filelist, index);
   old_index = cache->misc_entries_indices[cache->misc_cursor];
-  if ((old = BLI_ghash_popkey(cache->misc_entries, POINTER_FROM_INT(old_index), NULL))) {
+  if ((old = static_cast<FileDirEntry *>(
+           BLI_ghash_popkey(cache->misc_entries, POINTER_FROM_INT(old_index), NULL)))) {
     BLI_ghash_remove(cache->uids, POINTER_FROM_UINT(old->uid), NULL, NULL);
     filelist_file_release_entry(filelist, old);
   }
@@ -2371,7 +2201,8 @@ static bool filelist_file_cache_block_create(FileList *filelist,
       FileDirEntry *entry;
 
       /* That entry might have already been requested and stored in misc cache... */
-      if ((entry = BLI_ghash_popkey(cache->misc_entries, POINTER_FROM_INT(idx), NULL)) == NULL) {
+      if ((entry = static_cast<FileDirEntry *>(
+               BLI_ghash_popkey(cache->misc_entries, POINTER_FROM_INT(idx), NULL))) == NULL) {
         entry = filelist_file_create_entry(filelist, idx);
         BLI_ghash_insert(cache->uids, POINTER_FROM_UINT(entry->uid), entry);
       }
@@ -2660,7 +2491,8 @@ bool filelist_cache_previews_update(FileList *filelist)
   //  printf("%s: Update Previews...\n", __func__);
 
   while (!BLI_thread_queue_is_empty(cache->previews_done)) {
-    FileListEntryPreview *preview = BLI_thread_queue_pop(cache->previews_done);
+    FileListEntryPreview *preview = static_cast<FileListEntryPreview *>(
+        BLI_thread_queue_pop(cache->previews_done));
     FileDirEntry *entry;
 
     /* Paranoid (should never happen currently
@@ -3050,8 +2882,8 @@ static int filelist_readjob_list_dir(const char *root,
         continue;
       }
 
-      entry = MEM_callocN(sizeof(*entry), __func__);
-      entry->relpath = MEM_dupallocN(files[i].relname);
+      entry = MEM_cnew<FileListInternEntry>(__func__);
+      entry->relpath = static_cast<char *>(MEM_dupallocN(files[i].relname));
       entry->st = files[i].s;
 
       BLI_join_dirfile(full_path, FILE_MAX, root, entry->relpath);
@@ -3069,14 +2901,14 @@ static int filelist_readjob_list_dir(const char *root,
 
       /* Is this a file that points to another file? */
       if (entry->attributes & FILE_ATTR_ALIAS) {
-        entry->redirection_path = MEM_callocN(FILE_MAXDIR, __func__);
+        entry->redirection_path = MEM_cnew_array<char>(FILE_MAXDIR, __func__);
         if (BLI_file_alias_target(full_path, entry->redirection_path)) {
           if (BLI_is_dir(entry->redirection_path)) {
             entry->typeflag = FILE_TYPE_DIR;
             BLI_path_slash_ensure(entry->redirection_path);
           }
           else {
-            entry->typeflag = ED_path_extension_type(entry->redirection_path);
+            entry->typeflag = (eFileSel_File_Types)ED_path_extension_type(entry->redirection_path);
           }
           target = entry->redirection_path;
 #ifdef WIN32
@@ -3101,7 +2933,7 @@ static int filelist_readjob_list_dir(const char *root,
           }
         }
         else {
-          entry->typeflag = ED_path_extension_type(target);
+          entry->typeflag = (eFileSel_File_Types)ED_path_extension_type(target);
           if (filter_glob[0] && BLI_path_extension_check_glob(target, filter_glob)) {
             entry->typeflag |= FILE_TYPE_OPERATOR;
           }
@@ -3124,6 +2956,8 @@ static int filelist_readjob_list_dir(const char *root,
 }
 
 typedef enum ListLibOptions {
+  LIST_LIB_OPTION_NONE = 0,
+
   /* Will read both the groups + actual ids from the library. Reduces the amount of times that
    * a library needs to be opened. */
   LIST_LIB_RECURSIVE = (1 << 0),
@@ -3134,11 +2968,12 @@ typedef enum ListLibOptions {
   /* Add given root as result. */
   LIST_LIB_ADD_PARENT = (1 << 2),
 } ListLibOptions;
+ENUM_OPERATORS(ListLibOptions, LIST_LIB_ADD_PARENT);
 
 static FileListInternEntry *filelist_readjob_list_lib_group_create(const int idcode,
                                                                    const char *group_name)
 {
-  FileListInternEntry *entry = MEM_callocN(sizeof(*entry), __func__);
+  FileListInternEntry *entry = MEM_cnew<FileListInternEntry>(__func__);
   entry->relpath = BLI_strdup(group_name);
   entry->typeflag |= FILE_TYPE_BLENDERLIB | FILE_TYPE_DIR;
   entry->blentype = idcode;
@@ -3151,7 +2986,7 @@ static void filelist_readjob_list_lib_add_datablock(ListBase *entries,
                                                     const int idcode,
                                                     const char *group_name)
 {
-  FileListInternEntry *entry = MEM_callocN(sizeof(*entry), __func__);
+  FileListInternEntry *entry = MEM_cnew<FileListInternEntry>(__func__);
   if (prefix_relpath_with_group_name) {
     entry->relpath = BLI_sprintfN("%s/%s", group_name, datablock_info->name);
   }
@@ -3175,7 +3010,7 @@ static void filelist_readjob_list_lib_add_datablocks(ListBase *entries,
                                                      const char *group_name)
 {
   for (LinkNode *ln = datablock_infos; ln; ln = ln->next) {
-    struct BLODataBlockInfo *datablock_info = ln->link;
+    struct BLODataBlockInfo *datablock_info = static_cast<BLODataBlockInfo *>(ln->link);
     filelist_readjob_list_lib_add_datablock(
         entries, datablock_info, prefix_relpath_with_group_name, idcode, group_name);
   }
@@ -3199,7 +3034,7 @@ static void filelist_readjob_list_lib_add_from_indexer_entries(
 
 static FileListInternEntry *filelist_readjob_list_lib_navigate_to_parent_entry_create(void)
 {
-  FileListInternEntry *entry = MEM_callocN(sizeof(*entry), __func__);
+  FileListInternEntry *entry = MEM_cnew<FileListInternEntry>(__func__);
   entry->relpath = BLI_strdup(FILENAME_PARENT);
   entry->typeflag |= (FILE_TYPE_BLENDERLIB | FILE_TYPE_DIR);
   return entry;
@@ -3279,7 +3114,7 @@ static int filelist_readjob_list_lib(const char *root,
   }
 
   /* Open the library file. */
-  BlendFileReadReport bf_reports = {.reports = NULL};
+  BlendFileReadReport bf_reports{};
   libfiledata = BLO_blendhandle_from_file(dir, &bf_reports);
   if (libfiledata == NULL) {
     return 0;
@@ -3310,7 +3145,7 @@ static int filelist_readjob_list_lib(const char *root,
     group_len = BLI_linklist_count(groups);
 
     for (LinkNode *ln = groups; ln; ln = ln->next) {
-      const char *group_name = ln->link;
+      const char *group_name = static_cast<char *>(ln->link);
       const int idcode = groupname_to_code(group_name);
       FileListInternEntry *group_entry = filelist_readjob_list_lib_group_create(idcode,
                                                                                 group_name);
@@ -3615,7 +3450,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
   int dirs_done_count = 0, dirs_todo_count = 1;
 
   todo_dirs = BLI_stack_new(sizeof(*td_dir), __func__);
-  td_dir = BLI_stack_push_r(todo_dirs);
+  td_dir = static_cast<TodoDir *>(BLI_stack_push_r(todo_dirs));
   td_dir->level = 1;
 
   BLI_strncpy(dir, filelist->filelist.root, sizeof(dir));
@@ -3625,13 +3460,13 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
   td_dir->dir = BLI_strdup(dir);
 
   /* Init the file indexer. */
-  FileIndexer indexer_runtime = {.callbacks = filelist->indexer};
+  FileIndexer indexer_runtime{};
+  indexer_runtime.callbacks = filelist->indexer;
   if (indexer_runtime.callbacks->init_user_data) {
     indexer_runtime.user_data = indexer_runtime.callbacks->init_user_data(dir, sizeof(dir));
   }
 
   while (!BLI_stack_is_empty(todo_dirs) && !(*stop)) {
-    FileListInternEntry *entry;
     int entries_num = 0;
 
     char *subdir;
@@ -3639,7 +3474,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
     int recursion_level;
     bool skip_currpar;
 
-    td_dir = BLI_stack_peek(todo_dirs);
+    td_dir = static_cast<TodoDir *>(BLI_stack_peek(todo_dirs));
     subdir = td_dir->dir;
     recursion_level = td_dir->level;
     skip_currpar = (recursion_level > 1);
@@ -3657,7 +3492,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
 
     bool is_lib = false;
     if (do_lib) {
-      ListLibOptions list_lib_options = 0;
+      ListLibOptions list_lib_options = LIST_LIB_OPTION_NONE;
       if (!skip_currpar) {
         list_lib_options |= LIST_LIB_ADD_PARENT;
       }
@@ -3684,7 +3519,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
           subdir, &entries, filter_glob, do_lib, job_params->main_name, skip_currpar);
     }
 
-    for (entry = entries.first; entry; entry = entry->next) {
+    LISTBASE_FOREACH (FileListInternEntry *, entry, &entries) {
       entry->uid = filelist_uid_generate(filelist);
 
       /* When loading entries recursive, the rel_path should be relative from the root dir.
@@ -3701,7 +3536,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
         /* We have a directory we want to list, add it to todo list! */
         BLI_join_dirfile(dir, sizeof(dir), root, entry->relpath);
         BLI_path_normalize_dir(job_params->main_name, dir);
-        td_dir = BLI_stack_push_r(todo_dirs);
+        td_dir = static_cast<TodoDir *>(BLI_stack_push_r(todo_dirs));
         td_dir->level = recursion_level + 1;
         td_dir->dir = BLI_strdup(dir);
         dirs_todo_count++;
@@ -3727,7 +3562,7 @@ static void filelist_readjob_recursive_dir_add_items(const bool do_lib,
   /* If we were interrupted by stop, stack may not be empty and we need to free
    * pending dir paths. */
   while (!BLI_stack_is_empty(todo_dirs)) {
-    td_dir = BLI_stack_peek(todo_dirs);
+    td_dir = static_cast<TodoDir *>(BLI_stack_peek(todo_dirs));
     MEM_freeN(td_dir->dir);
     BLI_stack_discard(todo_dirs);
   }
@@ -3831,7 +3666,7 @@ static void filelist_readjob_main_assets_add_items(FileListReadJob *job_params,
 
     const char *id_code_name = BKE_idtype_idcode_to_name(GS(id_iter->name));
 
-    entry = MEM_callocN(sizeof(*entry), __func__);
+    entry = MEM_cnew<FileListInternEntry>(__func__);
     entry->relpath = BLI_strdup(id_code_name);
     entry->name = id_iter->name + 2;
     entry->free_name = false;
@@ -3935,7 +3770,7 @@ static bool filelist_readjob_is_partial_read(const FileListReadJob *read_job)
  */
 static void filelist_readjob_startjob(void *flrjv, short *stop, short *do_update, float *progress)
 {
-  FileListReadJob *flrj = flrjv;
+  FileListReadJob *flrj = static_cast<FileListReadJob *>(flrjv);
 
   //  printf("START filelist reading (%d files, main thread: %d)\n",
   //         flrj->filelist->filelist.entries_num, BLI_thread_is_main());
@@ -3944,7 +3779,7 @@ static void filelist_readjob_startjob(void *flrjv, short *stop, short *do_update
 
   BLI_assert((flrj->tmp_filelist == NULL) && flrj->filelist);
 
-  flrj->tmp_filelist = MEM_dupallocN(flrj->filelist);
+  flrj->tmp_filelist = static_cast<FileList *>(MEM_dupallocN(flrj->filelist));
 
   BLI_listbase_clear(&flrj->tmp_filelist->filelist.entries);
   flrj->tmp_filelist->filelist.entries_num = FILEDIR_NBR_ENTRIES_UNSET;
@@ -3976,7 +3811,7 @@ static void filelist_readjob_startjob(void *flrjv, short *stop, short *do_update
  */
 static void filelist_readjob_update(void *flrjv)
 {
-  FileListReadJob *flrj = flrjv;
+  FileListReadJob *flrj = static_cast<FileListReadJob *>(flrjv);
   FileListIntern *fl_intern = &flrj->filelist->filelist_intern;
   ListBase new_entries = {NULL};
   int entries_num, new_entries_num = 0;
@@ -4019,7 +3854,7 @@ static void filelist_readjob_update(void *flrjv)
 
 static void filelist_readjob_endjob(void *flrjv)
 {
-  FileListReadJob *flrj = flrjv;
+  FileListReadJob *flrj = static_cast<FileListReadJob *>(flrjv);
 
   /* In case there would be some dangling update... */
   filelist_readjob_update(flrjv);
@@ -4030,7 +3865,7 @@ static void filelist_readjob_endjob(void *flrjv)
 
 static void filelist_readjob_free(void *flrjv)
 {
-  FileListReadJob *flrj = flrjv;
+  FileListReadJob *flrj = static_cast<FileListReadJob *>(flrjv);
 
   //  printf("END filelist reading (%d files)\n", flrj->filelist->filelist.entries_num);
 
@@ -4060,7 +3895,7 @@ void filelist_readjob_start(FileList *filelist, const int space_notifier, const
   }
 
   /* prepare job data */
-  flrj = MEM_callocN(sizeof(*flrj), __func__);
+  flrj = MEM_cnew<FileListReadJob>(__func__);
   flrj->filelist = filelist;
   flrj->current_main = bmain;
   BLI_strncpy(flrj->main_name, BKE_main_blendfile_path(bmain), sizeof(flrj->main_name));
diff --git a/source/blender/editors/space_file/filelist.h b/source/blender/editors/space_file/filelist.h
index 4c1ae79eb22..89831483fdf 100644
--- a/source/blender/editors/space_file/filelist.h
+++ b/source/blender/editors/space_file/filelist.h
@@ -35,17 +35,6 @@ typedef enum FileCheckType {
   CHECK_ALL = 3,
 } FileCheckType;
 
-/* not listbase itself */
-void folderlist_free(struct ListBase *folderlist);
-void folderlist_popdir(struct ListBase *folderlist, char *dir);
-void folderlist_pushdir(struct ListBase *folderlist, const char *dir);
-const char *folderlist_peeklastdir(struct ListBase *folderlist);
-int folderlist_clear_next(struct SpaceFile *sfile);
-
-void folder_history_list_ensure_for_active_browse_mode(struct SpaceFile *sfile);
-void folder_history_list_free(struct SpaceFile *sfile);
-struct ListBase folder_history_list_duplicate(struct ListBase *listbase);
-
 void filelist_setsorting(struct FileList *filelist, short sort, bool invert_sort);
 void filelist_sort(struct FileList *filelist);
 
diff --git a/source/blender/editors/space_file/filesel.c b/source/blender/editors/space_file/filesel.c
index e42e1e98660..93aa5cf992d 100644
--- a/source/blender/editors/space_file/filesel.c
+++ b/source/blender/editors/space_file/filesel.c
@@ -665,12 +665,17 @@ void ED_fileselect_params_to_userdef(SpaceFile *sfile,
   }
 }
 
-void fileselect_file_set(SpaceFile *sfile, const int index)
+void fileselect_file_set(struct bContext *C, SpaceFile *sfile, const int index)
 {
   const struct FileDirEntry *file = filelist_file(sfile->files, index);
   if (file && file->relpath && file->relpath[0] && !(file->typeflag & FILE_TYPE_DIR)) {
     FileSelectParams *params = ED_fileselect_get_active_params(sfile);
     BLI_strncpy(params->file, file->relpath, FILE_MAXFILE);
+    if (sfile->op) {
+      /* Update the filepath properties of the operator. */
+      Main *bmain = CTX_data_main(C);
+      file_sfile_to_operator(C, bmain, sfile->op, sfile);
+    }
   }
 }
 
@@ -1041,7 +1046,7 @@ void ED_fileselect_init_layout(struct SpaceFile *sfile, ARegion *region)
     layout->attribute_column_header_h = 0;
     layout->offset_top = layout->attribute_column_header_h;
     layout->height = (int)(BLI_rctf_size_y(&v2d->cur) - 2 * layout->tile_border_y);
-    /* Padding by full scrollbar H is too much, can overlap tile border Y. */
+    /* Padding by full scroll-bar H is too much, can overlap tile border Y. */
     layout->rows = (layout->height - V2D_SCROLL_HEIGHT + layout->tile_border_y) /
                    (layout->tile_h + 2 * layout->tile_border_y);
     layout->tile_w = VERTLIST_MAJORCOLUMN_WIDTH;
@@ -1385,3 +1390,24 @@ ScrArea *ED_fileselect_handler_area_find_any_with_op(const wmWindow *win)
 
   return NULL;
 }
+
+void ED_fileselect_ensure_default_filepath(struct bContext *C,
+                                           struct wmOperator *op,
+                                           const char *extension)
+{
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
+    struct Main *bmain = CTX_data_main(C);
+    char filepath[FILE_MAX];
+    const char *blendfile_path = BKE_main_blendfile_path(bmain);
+
+    if (blendfile_path[0] == '\0') {
+      BLI_strncpy(filepath, DATA_("untitled"), sizeof(filepath));
+    }
+    else {
+      BLI_strncpy(filepath, blendfile_path, sizeof(filepath));
+    }
+
+    BLI_path_extension_replace(filepath, sizeof(filepath), extension);
+    RNA_string_set(op->ptr, "filepath", filepath);
+  }
+}
diff --git a/source/blender/editors/space_file/folder_history.cc b/source/blender/editors/space_file/folder_history.cc
new file mode 100644
index 00000000000..9aa1d181584
--- /dev/null
+++ b/source/blender/editors/space_file/folder_history.cc
@@ -0,0 +1,191 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2007 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup spfile
+ *
+ * Storage for a list of folders for history backward and forward navigation.
+ */
+
+#include <cstring>
+
+#include "BLI_listbase.h"
+#include "BLI_path_util.h"
+#include "BLI_string.h"
+
+#include "BKE_context.h"
+
+#include "DNA_space_types.h"
+
+#include "ED_fileselect.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "file_intern.h"
+
+/* ----------------- FOLDERLIST (previous/next) -------------- */
+
+typedef struct FolderList {
+  struct FolderList *next, *prev;
+  char *foldername;
+} FolderList;
+
+void folderlist_popdir(struct ListBase *folderlist, char *dir)
+{
+  const char *prev_dir;
+  struct FolderList *folder;
+  folder = static_cast<FolderList *>(folderlist->last);
+
+  if (folder) {
+    /* remove the current directory */
+    MEM_freeN(folder->foldername);
+    BLI_freelinkN(folderlist, folder);
+
+    folder = static_cast<FolderList *>(folderlist->last);
+    if (folder) {
+      prev_dir = folder->foldername;
+      BLI_strncpy(dir, prev_dir, FILE_MAXDIR);
+    }
+  }
+  /* delete the folder next or use setdir directly before PREVIOUS OP */
+}
+
+void folderlist_pushdir(ListBase *folderlist, const char *dir)
+{
+  if (!dir[0]) {
+    return;
+  }
+
+  struct FolderList *folder, *previous_folder;
+  previous_folder = static_cast<FolderList *>(folderlist->last);
+
+  /* check if already exists */
+  if (previous_folder && previous_folder->foldername) {
+    if (BLI_path_cmp(previous_folder->foldername, dir) == 0) {
+      return;
+    }
+  }
+
+  /* create next folder element */
+  folder = MEM_new<FolderList>(__func__);
+  folder->foldername = BLI_strdup(dir);
+
+  /* add it to the end of the list */
+  BLI_addtail(folderlist, folder);
+}
+
+const char *folderlist_peeklastdir(ListBase *folderlist)
+{
+  struct FolderList *folder;
+
+  if (!folderlist->last) {
+    return NULL;
+  }
+
+  folder = static_cast<FolderList *>(folderlist->last);
+  return folder->foldername;
+}
+
+int folderlist_clear_next(struct SpaceFile *sfile)
+{
+  const FileSelectParams *params = ED_fileselect_get_active_params(sfile);
+  struct FolderList *folder;
+
+  /* if there is no folder_next there is nothing we can clear */
+  if (BLI_listbase_is_empty(sfile->folders_next)) {
+    return 0;
+  }
+
+  /* if previous_folder, next_folder or refresh_folder operators are executed
+   * it doesn't clear folder_next */
+  folder = static_cast<FolderList *>(sfile->folders_prev->last);
+  if ((!folder) || (BLI_path_cmp(folder->foldername, params->dir) == 0)) {
+    return 0;
+  }
+
+  /* eventually clear flist->folders_next */
+  return 1;
+}
+
+void folderlist_free(ListBase *folderlist)
+{
+  if (folderlist) {
+    LISTBASE_FOREACH (FolderList *, folder, folderlist) {
+      MEM_freeN(folder->foldername);
+    }
+    BLI_freelistN(folderlist);
+  }
+}
+
+static ListBase folderlist_duplicate(ListBase *folderlist)
+{
+  ListBase folderlistn = {NULL};
+
+  BLI_duplicatelist(&folderlistn, folderlist);
+
+  LISTBASE_FOREACH (FolderList *, folder, &folderlistn) {
+    folder->foldername = (char *)MEM_dupallocN(folder->foldername);
+  }
+  return folderlistn;
+}
+
+/* ----------------- Folder-History (wraps/owns file list above) -------------- */
+
+static FileFolderHistory *folder_history_find(const SpaceFile *sfile, eFileBrowse_Mode browse_mode)
+{
+  LISTBASE_FOREACH (FileFolderHistory *, history, &sfile->folder_histories) {
+    if (history->browse_mode == browse_mode) {
+      return history;
+    }
+  }
+
+  return NULL;
+}
+
+void folder_history_list_ensure_for_active_browse_mode(SpaceFile *sfile)
+{
+  FileFolderHistory *history = folder_history_find(sfile, (eFileBrowse_Mode)sfile->browse_mode);
+
+  if (!history) {
+    history = MEM_cnew<FileFolderHistory>(__func__);
+    history->browse_mode = sfile->browse_mode;
+    BLI_addtail(&sfile->folder_histories, history);
+  }
+
+  sfile->folders_next = &history->folders_next;
+  sfile->folders_prev = &history->folders_prev;
+}
+
+static void folder_history_entry_free(SpaceFile *sfile, FileFolderHistory *history)
+{
+  if (sfile->folders_prev == &history->folders_prev) {
+    sfile->folders_prev = NULL;
+  }
+  if (sfile->folders_next == &history->folders_next) {
+    sfile->folders_next = NULL;
+  }
+  folderlist_free(&history->folders_prev);
+  folderlist_free(&history->folders_next);
+  BLI_freelinkN(&sfile->folder_histories, history);
+}
+
+void folder_history_list_free(SpaceFile *sfile)
+{
+  LISTBASE_FOREACH_MUTABLE (FileFolderHistory *, history, &sfile->folder_histories) {
+    folder_history_entry_free(sfile, history);
+  }
+}
+
+ListBase folder_history_list_duplicate(ListBase *listbase)
+{
+  ListBase histories = {NULL};
+
+  LISTBASE_FOREACH (FileFolderHistory *, history, listbase) {
+    FileFolderHistory *history_new = static_cast<FileFolderHistory *>(MEM_dupallocN(history));
+    history_new->folders_prev = folderlist_duplicate(&history->folders_prev);
+    history_new->folders_next = folderlist_duplicate(&history->folders_next);
+    BLI_addtail(&histories, history_new);
+  }
+
+  return histories;
+}
diff --git a/source/blender/editors/space_file/fsmenu.c b/source/blender/editors/space_file/fsmenu.c
index 310c688383b..35ce7ef364c 100644
--- a/source/blender/editors/space_file/fsmenu.c
+++ b/source/blender/editors/space_file/fsmenu.c
@@ -443,7 +443,7 @@ void fsmenu_insert_entry(struct FSMenu *fsmenu,
         if (STREQ(tfsm->path, fsm_iter->path)) {
           icon = tfsm->icon;
           if (tfsm->name[0] && (!name || !name[0])) {
-            name = tfsm->name;
+            name = DATA_(tfsm->name);
           }
           break;
         }
@@ -519,7 +519,7 @@ void fsmenu_remove_entry(struct FSMenu *fsmenu, FSMenuCategory category, int idx
   }
 }
 
-void fsmenu_write_file(struct FSMenu *fsmenu, const char *filepath)
+bool fsmenu_write_file(struct FSMenu *fsmenu, const char *filepath)
 {
   FSMenuEntry *fsm_iter = NULL;
   char fsm_name[FILE_MAX];
@@ -527,33 +527,36 @@ void fsmenu_write_file(struct FSMenu *fsmenu, const char *filepath)
 
   FILE *fp = BLI_fopen(filepath, "w");
   if (!fp) {
-    return;
+    return false;
   }
 
-  fprintf(fp, "[Bookmarks]\n");
+  bool has_error = false;
+  has_error |= (fprintf(fp, "[Bookmarks]\n") < 0);
   for (fsm_iter = ED_fsmenu_get_category(fsmenu, FS_CATEGORY_BOOKMARKS); fsm_iter;
        fsm_iter = fsm_iter->next) {
     if (fsm_iter->path && fsm_iter->save) {
       fsmenu_entry_generate_name(fsm_iter, fsm_name, sizeof(fsm_name));
       if (fsm_iter->name[0] && !STREQ(fsm_iter->name, fsm_name)) {
-        fprintf(fp, "!%s\n", fsm_iter->name);
+        has_error |= (fprintf(fp, "!%s\n", fsm_iter->name) < 0);
       }
-      fprintf(fp, "%s\n", fsm_iter->path);
+      has_error |= (fprintf(fp, "%s\n", fsm_iter->path) < 0);
     }
   }
-  fprintf(fp, "[Recent]\n");
+  has_error = (fprintf(fp, "[Recent]\n") < 0);
   for (fsm_iter = ED_fsmenu_get_category(fsmenu, FS_CATEGORY_RECENT);
        fsm_iter && (nwritten < FSMENU_RECENT_MAX);
        fsm_iter = fsm_iter->next, nwritten++) {
     if (fsm_iter->path && fsm_iter->save) {
       fsmenu_entry_generate_name(fsm_iter, fsm_name, sizeof(fsm_name));
       if (fsm_iter->name[0] && !STREQ(fsm_iter->name, fsm_name)) {
-        fprintf(fp, "!%s\n", fsm_iter->name);
+        has_error |= (fprintf(fp, "!%s\n", fsm_iter->name) < 0);
       }
-      fprintf(fp, "%s\n", fsm_iter->path);
+      has_error |= (fprintf(fp, "%s\n", fsm_iter->path) < 0);
     }
   }
   fclose(fp);
+
+  return !has_error;
 }
 
 void fsmenu_read_bookmarks(struct FSMenu *fsmenu, const char *filepath)
diff --git a/source/blender/editors/space_file/fsmenu.h b/source/blender/editors/space_file/fsmenu.h
index 6e980a326fc..f4f0dafbc73 100644
--- a/source/blender/editors/space_file/fsmenu.h
+++ b/source/blender/editors/space_file/fsmenu.h
@@ -37,8 +37,11 @@ short fsmenu_can_save(struct FSMenu *fsmenu, enum FSMenuCategory category, int i
 /** Removes the fsmenu entry at the given \a index. */
 void fsmenu_remove_entry(struct FSMenu *fsmenu, enum FSMenuCategory category, int idx);
 
-/** saves the 'bookmarks' to the specified file */
-void fsmenu_write_file(struct FSMenu *fsmenu, const char *filepath);
+/**
+ * Saves the 'bookmarks' to the specified file.
+ * \return true on success.
+ */
+bool fsmenu_write_file(struct FSMenu *fsmenu, const char *filepath);
 
 /** reads the 'bookmarks' from the specified file */
 void fsmenu_read_bookmarks(struct FSMenu *fsmenu, const char *filepath);
diff --git a/source/blender/editors/space_file/space_file.c b/source/blender/editors/space_file/space_file.c
index a462476aae0..bba0c27bb4d 100644
--- a/source/blender/editors/space_file/space_file.c
+++ b/source/blender/editors/space_file/space_file.c
@@ -426,7 +426,7 @@ static void file_reset_filelist_showing_main_data(ScrArea *area, SpaceFile *sfil
 static void file_listener(const wmSpaceTypeListenerParams *listener_params)
 {
   ScrArea *area = listener_params->area;
-  wmNotifier *wmn = listener_params->notifier;
+  const wmNotifier *wmn = listener_params->notifier;
   SpaceFile *sfile = (SpaceFile *)area->spacedata.first;
 
   /* context changes */
@@ -514,7 +514,7 @@ static void file_main_region_init(wmWindowManager *wm, ARegion *region)
 static void file_main_region_listener(const wmRegionListenerParams *listener_params)
 {
   ARegion *region = listener_params->region;
-  wmNotifier *wmn = listener_params->notifier;
+  const wmNotifier *wmn = listener_params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -820,7 +820,7 @@ static void file_execution_region_draw(const bContext *C, ARegion *region)
 static void file_ui_region_listener(const wmRegionListenerParams *listener_params)
 {
   ARegion *region = listener_params->region;
-  wmNotifier *wmn = listener_params->notifier;
+  const wmNotifier *wmn = listener_params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -992,7 +992,7 @@ void ED_spacetype_file(void)
   ARegionType *art;
 
   st->spaceid = SPACE_FILE;
-  strncpy(st->name, "File", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "File");
 
   st->create = file_create;
   st->free = file_free;
diff --git a/source/blender/editors/space_graph/CMakeLists.txt b/source/blender/editors/space_graph/CMakeLists.txt
index ebcbf59be5f..39878debc39 100644
--- a/source/blender/editors/space_graph/CMakeLists.txt
+++ b/source/blender/editors/space_graph/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_graph/graph_buttons.c b/source/blender/editors/space_graph/graph_buttons.c
index bc2705df314..edba3c39042 100644
--- a/source/blender/editors/space_graph/graph_buttons.c
+++ b/source/blender/editors/space_graph/graph_buttons.c
@@ -41,6 +41,7 @@
 #include "WM_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "ED_anim_api.h"
@@ -225,15 +226,15 @@ static void graph_panel_properties(const bContext *C, Panel *panel)
 
   /* color settings */
   col = uiLayoutColumn(layout, true);
-  uiItemR(col, &fcu_ptr, "color_mode", 0, "Display Color", ICON_NONE);
+  uiItemR(col, &fcu_ptr, "color_mode", 0, IFACE_("Display Color"), ICON_NONE);
 
   if (fcu->color_mode == FCURVE_COLOR_CUSTOM) {
-    uiItemR(col, &fcu_ptr, "color", 0, "Color", ICON_NONE);
+    uiItemR(col, &fcu_ptr, "color", 0, IFACE_("Color"), ICON_NONE);
   }
 
   /* smoothing setting */
   col = uiLayoutColumn(layout, true);
-  uiItemR(col, &fcu_ptr, "auto_smoothing", 0, "Handle Smoothing", ICON_NONE);
+  uiItemR(col, &fcu_ptr, "auto_smoothing", 0, IFACE_("Handle Smoothing"), ICON_NONE);
 
   MEM_freeN(ale);
 }
@@ -277,7 +278,7 @@ static void graphedit_activekey_update_cb(bContext *UNUSED(C),
 
   /* make sure F-Curve and its handles are still valid after this editing */
   sort_time_fcurve(fcu);
-  calchandles_fcurve(fcu);
+  BKE_fcurve_handles_recalc(fcu);
 }
 
 /* update callback for active keyframe properties - handle-editing wrapper */
@@ -640,7 +641,7 @@ static void do_graph_region_driver_buttons(bContext *C, void *id_v, int event)
       ID *id = id_v;
       AnimData *adt = BKE_animdata_from_id(id);
 
-      /* rebuild depsgraph for the new deps, and ensure COW copies get flushed. */
+      /* Rebuild depsgraph for the new dependencies, and ensure COW copies get flushed. */
       DEG_relations_tag_update(bmain);
       DEG_id_tag_update_ex(bmain, id, ID_RECALC_COPY_ON_WRITE);
       if (adt != NULL) {
diff --git a/source/blender/editors/space_graph/graph_draw.c b/source/blender/editors/space_graph/graph_draw.c
index 608a1f4d73e..41a8368152d 100644
--- a/source/blender/editors/space_graph/graph_draw.c
+++ b/source/blender/editors/space_graph/graph_draw.c
@@ -80,7 +80,7 @@ static void draw_fcurve_modifier_controls_envelope(FModifier *fcm,
 
   GPU_line_width(1.0f);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -107,7 +107,7 @@ static void draw_fcurve_modifier_controls_envelope(FModifier *fcm,
     /* set size of vertices (non-adjustable for now) */
     GPU_point_size(2.0f);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* for now, point color is fixed, and is white */
     immUniformColor3f(1.0f, 1.0f, 1.0f);
@@ -408,7 +408,7 @@ static void draw_fcurve_handles(SpaceGraph *sipo, FCurve *fcu)
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   uint color = GPU_vertformat_attr_add(
       format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
   if ((sipo->flag & SIPO_BEAUTYDRAW_OFF) == 0) {
     GPU_line_smooth(true);
   }
@@ -540,7 +540,7 @@ static void draw_fcurve_samples(SpaceGraph *sipo, ARegion *region, FCurve *fcu)
     GPU_blend(GPU_BLEND_ALPHA);
 
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformThemeColor((fcu->flag & FCURVE_SELECTED) ? TH_TEXT_HI : TH_TEXT);
 
@@ -1045,7 +1045,7 @@ static void draw_fcurve(bAnimContext *ac, SpaceGraph *sipo, ARegion *region, bAn
 
     if (BKE_fcurve_is_protected(fcu)) {
       /* Protected curves (non editable) are drawn with dotted lines. */
-      immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
       immUniform2f("viewport_size", viewport_size[2] / UI_DPI_FAC, viewport_size[3] / UI_DPI_FAC);
       immUniform1i("colors_len", 0); /* Simple dashes. */
       immUniform1f("dash_width", 4.0f);
@@ -1190,7 +1190,7 @@ static void graph_draw_driver_debug(bAnimContext *ac, ID *id, FCurve *fcu)
 
   const uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -1268,7 +1268,7 @@ static void graph_draw_driver_debug(bAnimContext *ac, ID *id, FCurve *fcu)
       immUnbindProgram();
 
       /* GPU_PRIM_POINTS do not survive dashed line geometry shader... */
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       /* x marks the spot .................................................... */
       /* -> outer frame */
@@ -1310,7 +1310,7 @@ void graph_draw_ghost_curves(bAnimContext *ac, SpaceGraph *sipo, ARegion *region
   const uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
diff --git a/source/blender/editors/space_graph/graph_edit.c b/source/blender/editors/space_graph/graph_edit.c
index 7e8bca88744..cab491fb8d2 100644
--- a/source/blender/editors/space_graph/graph_edit.c
+++ b/source/blender/editors/space_graph/graph_edit.c
@@ -723,7 +723,7 @@ static bool delete_graph_keys(bAnimContext *ac)
     bool changed;
 
     /* Delete selected keyframes only. */
-    changed = delete_fcurve_keys(fcu);
+    changed = BKE_fcurve_delete_keys_selected(fcu);
 
     if (changed) {
       ale->update |= ANIM_UPDATE_DEFAULT;
@@ -1448,7 +1448,7 @@ static int graphkeys_expo_exec(bContext *C, wmOperator *op)
 void GRAPH_OT_extrapolation_type(wmOperatorType *ot)
 {
   /* Identifiers */
-  ot->name = "Set Keyframe Extrapolation";
+  ot->name = "Set F-Curve Extrapolation";
   ot->idname = "GRAPH_OT_extrapolation_type";
   ot->description = "Set extrapolation mode for selected F-Curves";
 
@@ -1488,7 +1488,7 @@ static void setipo_graph_keys(bAnimContext *ac, short mode)
    * Currently that's not necessary here.
    */
   for (ale = anim_data.first; ale; ale = ale->next) {
-    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, calchandles_fcurve);
+    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, BKE_fcurve_handles_recalc);
 
     ale->update |= ANIM_UPDATE_DEFAULT_NOHANDLES;
   }
@@ -1566,7 +1566,7 @@ static void seteasing_graph_keys(bAnimContext *ac, short mode)
    * Currently that's not necessary here.
    */
   for (ale = anim_data.first; ale; ale = ale->next) {
-    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, calchandles_fcurve);
+    ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, BKE_fcurve_handles_recalc);
 
     ale->update |= ANIM_UPDATE_DEFAULT_NOHANDLES;
   }
@@ -1649,7 +1649,7 @@ static void sethandles_graph_keys(bAnimContext *ac, short mode)
     /* Any selected keyframes for editing? */
     if (ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, sel_cb, NULL)) {
       /* Change type of selected handles. */
-      ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, edit_cb, BKE_fcurve_handles_recalc);
 
       ale->update |= ANIM_UPDATE_DEFAULT;
     }
@@ -2295,11 +2295,11 @@ static void snap_graph_keys(bAnimContext *ac, short mode)
     /* Perform snapping. */
     if (adt) {
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 0);
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 0);
     }
     else {
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
     }
 
     ale->update |= ANIM_UPDATE_DEFAULT;
@@ -2555,11 +2555,11 @@ static void mirror_graph_keys(bAnimContext *ac, short mode)
     /* Perform actual mirroring. */
     if (adt) {
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 0);
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
       ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 0);
     }
     else {
-      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
+      ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, BKE_fcurve_handles_recalc);
     }
 
     ale->update |= ANIM_UPDATE_DEFAULT;
@@ -3020,7 +3020,7 @@ static int graph_driver_vars_paste_exec(bContext *C, wmOperator *op)
 
   /* Successful or not? */
   if (ok) {
-    /* Rebuild depsgraph, now that there are extra deps here. */
+    /* Rebuild depsgraph, now that there are extra dependencies here. */
     DEG_relations_tag_update(CTX_data_main(C));
 
     /* Set notifier that keyframes have changed. */
diff --git a/source/blender/editors/space_graph/graph_select.c b/source/blender/editors/space_graph/graph_select.c
index a36bd5c1461..932ed417f21 100644
--- a/source/blender/editors/space_graph/graph_select.c
+++ b/source/blender/editors/space_graph/graph_select.c
@@ -585,7 +585,7 @@ static bool box_select_graphkeys(bAnimContext *ac,
   initialize_box_select_key_editing_data(
       sipo, incl_handles, mode, ac, data, &scaled_rectf, &ked, &mapping_flag);
 
-  /* Get beztriple editing/validation funcs. */
+  /* Get beztriple editing/validation functions. */
   const KeyframeEditFunc select_cb = ANIM_editkeyframes_select(selectmode);
   const KeyframeEditFunc ok_cb = ANIM_editkeyframes_ok(mode);
 
@@ -893,7 +893,7 @@ void GRAPH_OT_select_box(wmOperatorType *ot)
   ot->poll = graphop_visible_keyframes_poll;
 
   /* Flags. */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_UNDO;
 
   /* Properties. */
   ot->prop = RNA_def_boolean(ot->srna, "axis_range", 0, "Axis Range", "");
@@ -1128,7 +1128,7 @@ static const EnumPropertyItem prop_column_select_types[] = {
 /* ------------------- */
 
 /* Selects all visible keyframes between the specified markers */
-/* TODO(campbell): this is almost an _exact_ duplicate of a function of the same name in
+/* TODO(@campbellbarton): this is almost an _exact_ duplicate of a function of the same name in
  * action_select.c should de-duplicate. */
 static void markers_selectkeys_between(bAnimContext *ac)
 {
@@ -1145,7 +1145,7 @@ static void markers_selectkeys_between(bAnimContext *ac)
   min -= 0.5f;
   max += 0.5f;
 
-  /* get editing funcs + data */
+  /* Get editing functions + data. */
   ok_cb = ANIM_editkeyframes_ok(BEZT_OK_FRAMERANGE);
   select_cb = ANIM_editkeyframes_select(SELECT_ADD);
 
@@ -1295,6 +1295,7 @@ void GRAPH_OT_select_column(wmOperatorType *ot)
 
   /* props */
   ot->prop = RNA_def_enum(ot->srna, "mode", prop_column_select_types, 0, "Mode", "");
+  RNA_def_property_flag(ot->prop, PROP_HIDDEN);
 }
 
 /** \} */
diff --git a/source/blender/editors/space_graph/space_graph.c b/source/blender/editors/space_graph/space_graph.c
index 43621d74e79..1434f204ee5 100644
--- a/source/blender/editors/space_graph/space_graph.c
+++ b/source/blender/editors/space_graph/space_graph.c
@@ -90,7 +90,6 @@ static SpaceLink *graph_create(const ScrArea *UNUSED(area), const Scene *scene)
   BLI_addtail(&sipo->regionbase, region);
   region->regiontype = RGN_TYPE_UI;
   region->alignment = RGN_ALIGN_RIGHT;
-  region->flag = RGN_FLAG_HIDDEN;
 
   /* main region */
   region = MEM_callocN(sizeof(ARegion), "main region for graphedit");
@@ -225,7 +224,7 @@ static void graph_main_region_draw(const bContext *C, ARegion *region)
   if (((sipo->flag & SIPO_NODRAWCURSOR) == 0)) {
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* horizontal component of value-cursor (value line before the current frame line) */
     float y = sipo->cursorVal;
@@ -394,7 +393,7 @@ static void graph_buttons_region_draw(const bContext *C, ARegion *region)
 static void graph_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -530,7 +529,7 @@ static void graph_region_message_subscribe(const wmRegionMessageSubscribeParams
 static void graph_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceGraph *sipo = (SpaceGraph *)area->spacedata.first;
 
   /* context changes */
@@ -626,7 +625,7 @@ static void graph_refresh_fcurve_colors(const bContext *C)
    * - we don't include ANIMFILTER_CURVEVISIBLE filter, as that will result in a
    *   mismatch between channel-colors and the drawn curves
    */
-  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_NODUPLIS);
+  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_NODUPLIS | ANIMFILTER_FCURVESONLY);
   items = ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
 
   /* loop over F-Curves, assigning colors */
@@ -811,7 +810,7 @@ void ED_spacetype_ipo(void)
   ARegionType *art;
 
   st->spaceid = SPACE_GRAPH;
-  strncpy(st->name, "Graph", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Graph");
 
   st->create = graph_create;
   st->free = graph_free;
diff --git a/source/blender/editors/space_image/CMakeLists.txt b/source/blender/editors/space_image/CMakeLists.txt
index 39fb41245bf..4284d0f76af 100644
--- a/source/blender/editors/space_image/CMakeLists.txt
+++ b/source/blender/editors/space_image/CMakeLists.txt
@@ -16,7 +16,6 @@ set(INC
   ../../render
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -28,7 +27,7 @@ set(SRC
   image_edit.c
   image_ops.c
   image_sequence.c
-  image_undo.c
+  image_undo.cc
   space_image.c
 
   image_intern.h
diff --git a/source/blender/editors/space_image/image_buttons.c b/source/blender/editors/space_image/image_buttons.c
index 0a774ee679c..bc367a99d6b 100644
--- a/source/blender/editors/space_image/image_buttons.c
+++ b/source/blender/editors/space_image/image_buttons.c
@@ -869,7 +869,8 @@ void uiTemplateImage(uiLayout *layout,
     uiItemS(col);
 
     uiItemR(col, &imaptr, "generated_type", UI_ITEM_R_EXPAND, IFACE_("Type"), ICON_NONE);
-    if (ima->gen_type == IMA_GENTYPE_BLANK) {
+    ImageTile *base_tile = BKE_image_get_tile(ima, 0);
+    if (base_tile->gen_type == IMA_GENTYPE_BLANK) {
       uiItemR(col, &imaptr, "generated_color", 0, NULL, ICON_NONE);
     }
   }
@@ -921,7 +922,7 @@ void uiTemplateImage(uiLayout *layout,
     }
   }
 
-  /* Colorspace and alpha */
+  /* Color-space and alpha. */
   {
     uiItemS(layout);
 
@@ -1211,6 +1212,11 @@ void uiTemplateImageInfo(uiLayout *layout, bContext *C, Image *ima, ImageUser *i
       ofs += BLI_strncpy_rlen(str + ofs, TIP_(" + Z"), len - ofs);
     }
 
+    eGPUTextureFormat texture_format = IMB_gpu_get_texture_format(
+        ibuf, ima->flag & IMA_HIGH_BITDEPTH, ibuf->planes >= 8);
+    const char *texture_format_description = GPU_texture_format_description(texture_format);
+    ofs += BLI_snprintf_rlen(str + ofs, len - ofs, TIP_(",  %s"), texture_format_description);
+
     uiItemL(col, str, ICON_NONE);
   }
 
diff --git a/source/blender/editors/space_image/image_draw.c b/source/blender/editors/space_image/image_draw.c
index f6f9428213f..8a934396229 100644
--- a/source/blender/editors/space_image/image_draw.c
+++ b/source/blender/editors/space_image/image_draw.c
@@ -98,7 +98,7 @@ static void draw_render_info(
 
       uint pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       immUniformThemeColor(TH_FACE_SELECT);
 
       GPU_line_width(1.0f);
@@ -158,7 +158,7 @@ void ED_image_draw_info(Scene *scene,
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* noisy, high contrast make impossible to read if lower alpha is used. */
   immUniformColor4ub(0, 0, 0, 190);
@@ -338,7 +338,7 @@ void ED_image_draw_info(Scene *scene,
 
   /* BLF uses immediate mode too, so we must reset our vertex format */
   pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   if (channels == 4) {
     rcti color_rect_half;
@@ -381,7 +381,7 @@ void ED_image_draw_info(Scene *scene,
 
   /* draw outline */
   pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor3ub(128, 128, 128);
   imm_draw_box_wire_2d(pos, color_rect.xmin, color_rect.ymin, color_rect.xmax, color_rect.ymax);
   immUnbindProgram();
@@ -448,7 +448,7 @@ void draw_image_sample_line(SpaceImage *sima)
     uint shdr_dashed_pos = GPU_vertformat_attr_add(
         format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -557,7 +557,7 @@ void draw_image_cache(const bContext *C, ARegion *region)
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColor(TH_CFRAME);
   immRecti(pos, x, region_bottom, x + ceilf(framelen), region_bottom + 8 * UI_DPI_FAC);
   immUnbindProgram();
@@ -585,34 +585,35 @@ float ED_space_image_zoom_level(const View2D *v2d, const int grid_dimension)
 }
 
 void ED_space_image_grid_steps(SpaceImage *sima,
-                               float grid_steps[SI_GRID_STEPS_LEN],
+                               float grid_steps_x[SI_GRID_STEPS_LEN],
+                               float grid_steps_y[SI_GRID_STEPS_LEN],
                                const int grid_dimension)
 {
-  if (sima->flag & SI_CUSTOM_GRID) {
-    for (int step = 0; step < SI_GRID_STEPS_LEN; step++) {
-      grid_steps[step] = powf(1, step) * (1.0f / ((float)sima->custom_grid_subdiv));
+  const int flag = sima->flag;
+  for (int step = 0; step < SI_GRID_STEPS_LEN; step++) {
+    if (flag & SI_CUSTOM_GRID) {
+      grid_steps_x[step] = 1.0f / sima->custom_grid_subdiv[0];
+      grid_steps_y[step] = 1.0f / sima->custom_grid_subdiv[1];
     }
-  }
-  else {
-    for (int step = 0; step < SI_GRID_STEPS_LEN; step++) {
-      grid_steps[step] = powf(grid_dimension, step) *
-                         (1.0f / (powf(grid_dimension, SI_GRID_STEPS_LEN)));
+    else {
+      grid_steps_x[step] = powf(grid_dimension, step - SI_GRID_STEPS_LEN);
+      grid_steps_y[step] = powf(grid_dimension, step - SI_GRID_STEPS_LEN);
     }
   }
 }
 
-float ED_space_image_increment_snap_value(const int grid_dimesnions,
+float ED_space_image_increment_snap_value(const int grid_dimensions,
                                           const float grid_steps[SI_GRID_STEPS_LEN],
                                           const float zoom_factor)
 {
   /* Small offset on each grid_steps[] so that snapping value doesn't change until grid lines are
    * significantly visible.
-   * `Offset = 3/4 * (grid_steps[i] - (grid_steps[i] / grid_dimesnsions))`
+   * `Offset = 3/4 * (grid_steps[i] - (grid_steps[i] / grid_dimensions))`
    *
    * Refer `grid_frag.glsl` to find out when grid lines actually start appearing */
 
   for (int step = 0; step < SI_GRID_STEPS_LEN; step++) {
-    float offset = (3.0f / 4.0f) * (grid_steps[step] - (grid_steps[step] / grid_dimesnions));
+    float offset = (3.0f / 4.0f) * (grid_steps[step] - (grid_steps[step] / grid_dimensions));
 
     if ((grid_steps[step] - offset) > zoom_factor) {
       return grid_steps[step];
diff --git a/source/blender/editors/space_image/image_edit.c b/source/blender/editors/space_image/image_edit.c
index 950acd77f6a..fa0fdb01bdf 100644
--- a/source/blender/editors/space_image/image_edit.c
+++ b/source/blender/editors/space_image/image_edit.c
@@ -18,8 +18,10 @@
 #include "BKE_editmesh.h"
 #include "BKE_global.h"
 #include "BKE_image.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
+#include "BKE_scene.h"
 
 #include "IMB_imbuf_types.h"
 
@@ -212,13 +214,7 @@ void ED_space_image_get_size(SpaceImage *sima, int *r_width, int *r_height)
   }
   else if (sima->image && sima->image->type == IMA_TYPE_R_RESULT && scene) {
     /* not very important, just nice */
-    *r_width = (scene->r.xsch * scene->r.size) / 100;
-    *r_height = (scene->r.ysch * scene->r.size) / 100;
-
-    if ((scene->r.mode & R_BORDER) && (scene->r.mode & R_CROP)) {
-      *r_width *= BLI_rctf_size_x(&scene->r.border);
-      *r_height *= BLI_rctf_size_y(&scene->r.border);
-    }
+    BKE_render_resolution(&scene->r, true, r_width, r_height);
   }
   /* I know a bit weak... but preview uses not actual image size */
   // XXX else if (image_preview_active(sima, r_width, r_height));
@@ -475,8 +471,10 @@ bool ED_space_image_maskedit_poll(bContext *C)
   SpaceImage *sima = CTX_wm_space_image(C);
 
   if (sima) {
+    Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obedit = BKE_view_layer_edit_object_get(view_layer);
     return ED_space_image_check_show_maskedit(sima, obedit);
   }
 
diff --git a/source/blender/editors/space_image/image_ops.c b/source/blender/editors/space_image/image_ops.c
index 49489b696ef..dec4055c737 100644
--- a/source/blender/editors/space_image/image_ops.c
+++ b/source/blender/editors/space_image/image_ops.c
@@ -45,6 +45,7 @@
 #include "BKE_main.h"
 #include "BKE_packedFile.h"
 #include "BKE_report.h"
+#include "BKE_scene.h"
 
 #include "DEG_depsgraph.h"
 
@@ -940,7 +941,7 @@ static int image_view_selected_exec(bContext *C, wmOperator *UNUSED(op))
   if (ED_space_image_show_uvedit(sima, obedit)) {
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-        view_layer, ((View3D *)NULL), &objects_len);
+        scene, view_layer, ((View3D *)NULL), &objects_len);
     bool success = ED_uvedit_minmax_multi(scene, objects, objects_len, min, max);
     MEM_freeN(objects);
     if (!success) {
@@ -1830,7 +1831,7 @@ static void image_save_options_from_op(Main *bmain, ImageSaveOptions *opts, wmOp
 }
 
 static bool save_image_op(
-    Main *bmain, Image *ima, ImageUser *iuser, wmOperator *op, ImageSaveOptions *opts)
+    Main *bmain, Image *ima, ImageUser *iuser, wmOperator *op, const ImageSaveOptions *opts)
 {
   WM_cursor_wait(true);
 
@@ -3732,38 +3733,52 @@ static int render_border_exec(bContext *C, wmOperator *op)
   ARegion *region = CTX_wm_region(C);
   Scene *scene = CTX_data_scene(C);
   Render *re = RE_GetSceneRender(scene);
-  RenderData *rd;
-  rctf border;
+  SpaceImage *sima = CTX_wm_space_image(C);
 
   if (re == NULL) {
     /* Shouldn't happen, but better be safe close to the release. */
     return OPERATOR_CANCELLED;
   }
 
-  rd = RE_engine_get_render_data(re);
-  if ((rd->mode & (R_BORDER | R_CROP)) == (R_BORDER | R_CROP)) {
-    BKE_report(op->reports, RPT_INFO, "Can not set border from a cropped render");
-    return OPERATOR_CANCELLED;
-  }
+  /* Get information about the previous render, or current scene if no render yet. */
+  int width, height;
+  BKE_render_resolution(&scene->r, false, &width, &height);
+  const RenderData *rd = ED_space_image_has_buffer(sima) ? RE_engine_get_render_data(re) :
+                                                           &scene->r;
 
-  /* get rectangle from operator */
+  /* Get rectangle from the operator. */
+  rctf border;
   WM_operator_properties_border_to_rctf(op, &border);
   UI_view2d_region_to_view_rctf(&region->v2d, &border, &border);
 
-  /* actually set border */
+  /* Adjust for cropping. */
+  if ((rd->mode & (R_BORDER | R_CROP)) == (R_BORDER | R_CROP)) {
+    border.xmin = rd->border.xmin + border.xmin * (rd->border.xmax - rd->border.xmin);
+    border.xmax = rd->border.xmin + border.xmax * (rd->border.xmax - rd->border.xmin);
+    border.ymin = rd->border.ymin + border.ymin * (rd->border.ymax - rd->border.ymin);
+    border.ymax = rd->border.ymin + border.ymax * (rd->border.ymax - rd->border.ymin);
+  }
+
   CLAMP(border.xmin, 0.0f, 1.0f);
   CLAMP(border.ymin, 0.0f, 1.0f);
   CLAMP(border.xmax, 0.0f, 1.0f);
   CLAMP(border.ymax, 0.0f, 1.0f);
-  scene->r.border = border;
 
-  /* drawing a border surrounding the entire camera view switches off border rendering
-   * or the border covers no pixels */
+  /* Drawing a border surrounding the entire camera view switches off border rendering
+   * or the border covers no pixels. */
   if ((border.xmin <= 0.0f && border.xmax >= 1.0f && border.ymin <= 0.0f && border.ymax >= 1.0f) ||
       (border.xmin == border.xmax || border.ymin == border.ymax)) {
     scene->r.mode &= ~R_BORDER;
   }
   else {
+    /* Snap border to pixel boundaries, so drawing a border within a pixel selects that pixel. */
+    border.xmin = floorf(border.xmin * width) / width;
+    border.xmax = ceilf(border.xmax * width) / width;
+    border.ymin = floorf(border.ymin * height) / height;
+    border.ymax = ceilf(border.ymax * height) / height;
+
+    /* Set border. */
+    scene->r.border = border;
     scene->r.mode |= R_BORDER;
   }
 
@@ -3832,15 +3847,16 @@ void IMAGE_OT_clear_render_border(wmOperatorType *ot)
 
 static bool do_fill_tile(PointerRNA *ptr, Image *ima, ImageTile *tile)
 {
-  float color[4];
-  RNA_float_get_array(ptr, "color", color);
-  int gen_type = RNA_enum_get(ptr, "generated_type");
-  int width = RNA_int_get(ptr, "width");
-  int height = RNA_int_get(ptr, "height");
+  RNA_float_get_array(ptr, "color", tile->gen_color);
+  tile->gen_type = RNA_enum_get(ptr, "generated_type");
+  tile->gen_x = RNA_int_get(ptr, "width");
+  tile->gen_y = RNA_int_get(ptr, "height");
   bool is_float = RNA_boolean_get(ptr, "float");
-  int planes = RNA_boolean_get(ptr, "alpha") ? 32 : 24;
 
-  return BKE_image_fill_tile(ima, tile, width, height, color, gen_type, planes, is_float);
+  tile->gen_flag = is_float ? IMA_GEN_FLOAT : 0;
+  tile->gen_depth = RNA_boolean_get(ptr, "alpha") ? 32 : 24;
+
+  return BKE_image_fill_tile(ima, tile);
 }
 
 static void draw_fill_tile(PointerRNA *ptr, uiLayout *layout)
diff --git a/source/blender/editors/space_image/image_undo.c b/source/blender/editors/space_image/image_undo.cc
index a7a8bde1115..8f144264824 100644
--- a/source/blender/editors/space_image/image_undo.c
+++ b/source/blender/editors/space_image/image_undo.cc
@@ -22,6 +22,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "BLI_blenlib.h"
+#include "BLI_map.hh"
 #include "BLI_math.h"
 #include "BLI_threads.h"
 #include "BLI_utildefines.h"
@@ -82,14 +83,31 @@ void ED_image_paint_tile_lock_end(void)
  *
  * \{ */
 
-static ImBuf *imbuf_alloc_temp_tile(void)
+static ImBuf *imbuf_alloc_temp_tile()
 {
   return IMB_allocImBuf(
       ED_IMAGE_UNDO_TILE_SIZE, ED_IMAGE_UNDO_TILE_SIZE, 32, IB_rectfloat | IB_rect);
 }
 
-typedef struct PaintTile {
-  struct PaintTile *next, *prev;
+struct PaintTileKey {
+  int x_tile, y_tile;
+  Image *image;
+  ImBuf *ibuf;
+  /* Copied from iuser.tile in PaintTile. */
+  int iuser_tile;
+
+  uint64_t hash() const
+  {
+    return blender::get_default_hash_4(x_tile, y_tile, image, ibuf);
+  }
+  bool operator==(const PaintTileKey &other) const
+  {
+    return x_tile == other.x_tile && y_tile == other.y_tile && image == other.image &&
+           ibuf == other.ibuf && iuser_tile == other.iuser_tile;
+  }
+};
+
+struct PaintTile {
   Image *image;
   ImBuf *ibuf;
   /* For 2D image painting the ImageUser uses most of the values.
@@ -99,14 +117,14 @@ typedef struct PaintTile {
   ImageUser iuser;
   union {
     float *fp;
-    uint *uint;
+    uint32_t *uint;
     void *pt;
   } rect;
-  ushort *mask;
+  uint16_t *mask;
   bool valid;
   bool use_float;
   int x_tile, y_tile;
-} PaintTile;
+};
 
 static void ptile_free(PaintTile *ptile)
 {
@@ -119,23 +137,25 @@ static void ptile_free(PaintTile *ptile)
   MEM_freeN(ptile);
 }
 
-static void ptile_free_list(ListBase *paint_tiles)
-{
-  for (PaintTile *ptile = paint_tiles->first, *ptile_next; ptile; ptile = ptile_next) {
-    ptile_next = ptile->next;
-    ptile_free(ptile);
+struct PaintTileMap {
+  blender::Map<PaintTileKey, PaintTile *> map;
+
+  ~PaintTileMap()
+  {
+    for (PaintTile *ptile : map.values()) {
+      ptile_free(ptile);
+    }
   }
-  BLI_listbase_clear(paint_tiles);
-}
+};
 
-static void ptile_invalidate_list(ListBase *paint_tiles)
+static void ptile_invalidate_map(PaintTileMap *paint_tile_map)
 {
-  LISTBASE_FOREACH (PaintTile *, ptile, paint_tiles) {
+  for (PaintTile *ptile : paint_tile_map->map.values()) {
     ptile->valid = false;
   }
 }
 
-void *ED_image_paint_tile_find(ListBase *paint_tiles,
+void *ED_image_paint_tile_find(PaintTileMap *paint_tile_map,
                                Image *image,
                                ImBuf *ibuf,
                                ImageUser *iuser,
@@ -144,28 +164,32 @@ void *ED_image_paint_tile_find(ListBase *paint_tiles,
                                ushort **r_mask,
                                bool validate)
 {
-  LISTBASE_FOREACH (PaintTile *, ptile, paint_tiles) {
-    if (ptile->x_tile == x_tile && ptile->y_tile == y_tile) {
-      if (ptile->image == image && ptile->ibuf == ibuf && ptile->iuser.tile == iuser->tile) {
-        if (r_mask) {
-          /* allocate mask if requested. */
-          if (!ptile->mask) {
-            ptile->mask = MEM_callocN(sizeof(ushort) * square_i(ED_IMAGE_UNDO_TILE_SIZE),
-                                      "UndoImageTile.mask");
-          }
-          *r_mask = ptile->mask;
-        }
-        if (validate) {
-          ptile->valid = true;
-        }
-        return ptile->rect.pt;
-      }
+  PaintTileKey key;
+  key.ibuf = ibuf;
+  key.image = image;
+  key.iuser_tile = iuser->tile;
+  key.x_tile = x_tile;
+  key.y_tile = y_tile;
+  PaintTile **pptile = paint_tile_map->map.lookup_ptr(key);
+  if (pptile == nullptr) {
+    return nullptr;
+  }
+  PaintTile *ptile = *pptile;
+  if (r_mask) {
+    /* allocate mask if requested. */
+    if (!ptile->mask) {
+      ptile->mask = static_cast<uint16_t *>(
+          MEM_callocN(sizeof(uint16_t) * square_i(ED_IMAGE_UNDO_TILE_SIZE), "UndoImageTile.mask"));
     }
+    *r_mask = ptile->mask;
   }
-  return NULL;
+  if (validate) {
+    ptile->valid = true;
+  }
+  return ptile->rect.pt;
 }
 
-void *ED_image_paint_tile_push(ListBase *paint_tiles,
+void *ED_image_paint_tile_push(PaintTileMap *paint_tile_map,
                                Image *image,
                                ImBuf *ibuf,
                                ImBuf **tmpibuf,
@@ -177,37 +201,43 @@ void *ED_image_paint_tile_push(ListBase *paint_tiles,
                                bool use_thread_lock,
                                bool find_prev)
 {
-  const bool has_float = (ibuf->rect_float != NULL);
+  if (use_thread_lock) {
+    BLI_spin_lock(&paint_tiles_lock);
+  }
+  const bool has_float = (ibuf->rect_float != nullptr);
 
   /* check if tile is already pushed */
 
   /* in projective painting we keep accounting of tiles, so if we need one pushed, just push! */
   if (find_prev) {
     void *data = ED_image_paint_tile_find(
-        paint_tiles, image, ibuf, iuser, x_tile, y_tile, r_mask, true);
+        paint_tile_map, image, ibuf, iuser, x_tile, y_tile, r_mask, true);
     if (data) {
+      if (use_thread_lock) {
+        BLI_spin_unlock(&paint_tiles_lock);
+      }
       return data;
     }
   }
 
-  if (*tmpibuf == NULL) {
+  if (*tmpibuf == nullptr) {
     *tmpibuf = imbuf_alloc_temp_tile();
   }
 
-  PaintTile *ptile = MEM_callocN(sizeof(PaintTile), "PaintTile");
+  PaintTile *ptile = static_cast<PaintTile *>(MEM_callocN(sizeof(PaintTile), "PaintTile"));
 
   ptile->image = image;
   ptile->ibuf = ibuf;
   ptile->iuser = *iuser;
-  ptile->iuser.scene = NULL;
+  ptile->iuser.scene = nullptr;
 
   ptile->x_tile = x_tile;
   ptile->y_tile = y_tile;
 
   /* add mask explicitly here */
   if (r_mask) {
-    *r_mask = ptile->mask = MEM_callocN(sizeof(ushort) * square_i(ED_IMAGE_UNDO_TILE_SIZE),
-                                        "PaintTile.mask");
+    *r_mask = ptile->mask = static_cast<uint16_t *>(
+        MEM_callocN(sizeof(uint16_t) * square_i(ED_IMAGE_UNDO_TILE_SIZE), "PaintTile.mask"));
   }
 
   ptile->rect.pt = MEM_callocN((ibuf->rect_float ? sizeof(float[4]) : sizeof(char[4])) *
@@ -234,13 +264,24 @@ void *ED_image_paint_tile_push(ListBase *paint_tiles,
     SWAP(float *, ptile->rect.fp, (*tmpibuf)->rect_float);
   }
   else {
-    SWAP(uint *, ptile->rect.uint, (*tmpibuf)->rect);
+    SWAP(uint32_t *, ptile->rect.uint, (*tmpibuf)->rect);
   }
 
-  if (use_thread_lock) {
-    BLI_spin_lock(&paint_tiles_lock);
+  PaintTileKey key = {};
+  key.ibuf = ibuf;
+  key.image = image;
+  key.iuser_tile = iuser->tile;
+  key.x_tile = x_tile;
+  key.y_tile = y_tile;
+  PaintTile *existing_tile = nullptr;
+  paint_tile_map->map.add_or_modify(
+      key,
+      [&](PaintTile **pptile) { *pptile = ptile; },
+      [&](PaintTile **pptile) { existing_tile = *pptile; });
+  if (existing_tile) {
+    ptile_free(ptile);
+    ptile = existing_tile;
   }
-  BLI_addtail(paint_tiles, ptile);
 
   if (use_thread_lock) {
     BLI_spin_unlock(&paint_tiles_lock);
@@ -248,20 +289,20 @@ void *ED_image_paint_tile_push(ListBase *paint_tiles,
   return ptile->rect.pt;
 }
 
-static void ptile_restore_runtime_list(ListBase *paint_tiles)
+static void ptile_restore_runtime_map(PaintTileMap *paint_tile_map)
 {
   ImBuf *tmpibuf = imbuf_alloc_temp_tile();
 
-  LISTBASE_FOREACH (PaintTile *, ptile, paint_tiles) {
+  for (PaintTile *ptile : paint_tile_map->map.values()) {
     Image *image = ptile->image;
-    ImBuf *ibuf = BKE_image_acquire_ibuf(image, &ptile->iuser, NULL);
-    const bool has_float = (ibuf->rect_float != NULL);
+    ImBuf *ibuf = BKE_image_acquire_ibuf(image, &ptile->iuser, nullptr);
+    const bool has_float = (ibuf->rect_float != nullptr);
 
     if (has_float) {
       SWAP(float *, ptile->rect.fp, tmpibuf->rect_float);
     }
     else {
-      SWAP(uint *, ptile->rect.uint, tmpibuf->rect);
+      SWAP(uint32_t *, ptile->rect.uint, tmpibuf->rect);
     }
 
     IMB_rectcpy(ibuf,
@@ -277,7 +318,7 @@ static void ptile_restore_runtime_list(ListBase *paint_tiles)
       SWAP(float *, ptile->rect.fp, tmpibuf->rect_float);
     }
     else {
-      SWAP(uint *, ptile->rect.uint, tmpibuf->rect);
+      SWAP(uint32_t *, ptile->rect.uint, tmpibuf->rect);
     }
 
     /* Force OpenGL reload (maybe partial update will operate better?) */
@@ -291,7 +332,7 @@ static void ptile_restore_runtime_list(ListBase *paint_tiles)
     }
     ibuf->userflags |= IB_DISPLAY_BUFFER_INVALID;
 
-    BKE_image_release_ibuf(image, ibuf, NULL);
+    BKE_image_release_ibuf(image, ibuf, nullptr);
   }
 
   IMB_freeImBuf(tmpibuf);
@@ -303,35 +344,38 @@ static void ptile_restore_runtime_list(ListBase *paint_tiles)
 /** \name Image Undo Tile
  * \{ */
 
-static uint index_from_xy(uint tile_x, uint tile_y, const uint tiles_dims[2])
+static uint32_t index_from_xy(uint32_t tile_x, uint32_t tile_y, const uint32_t tiles_dims[2])
 {
   BLI_assert(tile_x < tiles_dims[0] && tile_y < tiles_dims[1]);
   return (tile_y * tiles_dims[0]) + tile_x;
 }
 
-typedef struct UndoImageTile {
+struct UndoImageTile {
   union {
     float *fp;
-    uint *uint;
+    uint32_t *uint_ptr;
     void *pt;
   } rect;
   int users;
-} UndoImageTile;
+};
 
 static UndoImageTile *utile_alloc(bool has_float)
 {
-  UndoImageTile *utile = MEM_callocN(sizeof(*utile), "ImageUndoTile");
+  UndoImageTile *utile = static_cast<UndoImageTile *>(
+      MEM_callocN(sizeof(*utile), "ImageUndoTile"));
   if (has_float) {
-    utile->rect.fp = MEM_mallocN(sizeof(float[4]) * square_i(ED_IMAGE_UNDO_TILE_SIZE), __func__);
+    utile->rect.fp = static_cast<float *>(
+        MEM_mallocN(sizeof(float[4]) * square_i(ED_IMAGE_UNDO_TILE_SIZE), __func__));
   }
   else {
-    utile->rect.uint = MEM_mallocN(sizeof(uint) * square_i(ED_IMAGE_UNDO_TILE_SIZE), __func__);
+    utile->rect.uint_ptr = static_cast<uint32_t *>(
+        MEM_mallocN(sizeof(uint32_t) * square_i(ED_IMAGE_UNDO_TILE_SIZE), __func__));
   }
   return utile;
 }
 
 static void utile_init_from_imbuf(
-    UndoImageTile *utile, const uint x, const uint y, const ImBuf *ibuf, ImBuf *tmpibuf)
+    UndoImageTile *utile, const uint32_t x, const uint32_t y, const ImBuf *ibuf, ImBuf *tmpibuf)
 {
   const bool has_float = ibuf->rect_float;
 
@@ -339,7 +383,7 @@ static void utile_init_from_imbuf(
     SWAP(float *, utile->rect.fp, tmpibuf->rect_float);
   }
   else {
-    SWAP(uint *, utile->rect.uint, tmpibuf->rect);
+    SWAP(uint32_t *, utile->rect.uint_ptr, tmpibuf->rect);
   }
 
   IMB_rectcpy(tmpibuf, ibuf, 0, 0, x, y, ED_IMAGE_UNDO_TILE_SIZE, ED_IMAGE_UNDO_TILE_SIZE);
@@ -348,7 +392,7 @@ static void utile_init_from_imbuf(
     SWAP(float *, utile->rect.fp, tmpibuf->rect_float);
   }
   else {
-    SWAP(uint *, utile->rect.uint, tmpibuf->rect);
+    SWAP(uint32_t *, utile->rect.uint_ptr, tmpibuf->rect);
   }
 }
 
@@ -357,13 +401,13 @@ static void utile_restore(
 {
   const bool has_float = ibuf->rect_float;
   float *prev_rect_float = tmpibuf->rect_float;
-  uint *prev_rect = tmpibuf->rect;
+  uint32_t *prev_rect = tmpibuf->rect;
 
   if (has_float) {
     tmpibuf->rect_float = utile->rect.fp;
   }
   else {
-    tmpibuf->rect = utile->rect.uint;
+    tmpibuf->rect = utile->rect.uint_ptr;
   }
 
   IMB_rectcpy(ibuf, tmpibuf, x, y, 0, 0, ED_IMAGE_UNDO_TILE_SIZE, ED_IMAGE_UNDO_TILE_SIZE);
@@ -378,7 +422,7 @@ static void utile_decref(UndoImageTile *utile)
   BLI_assert(utile->users >= 0);
   if (utile->users == 0) {
     MEM_freeN(utile->rect.pt);
-    MEM_freeN(utile);
+    MEM_delete(utile);
   }
 }
 
@@ -388,7 +432,7 @@ static void utile_decref(UndoImageTile *utile)
 /** \name Image Undo Buffer
  * \{ */
 
-typedef struct UndoImageBuf {
+struct UndoImageBuf {
   struct UndoImageBuf *next, *prev;
 
   /**
@@ -401,23 +445,21 @@ typedef struct UndoImageBuf {
   UndoImageTile **tiles;
 
   /** Can calculate these from dims, just for convenience. */
-  uint tiles_len;
-  uint tiles_dims[2];
+  uint32_t tiles_len;
+  uint32_t tiles_dims[2];
 
-  uint image_dims[2];
+  uint32_t image_dims[2];
 
   /** Store variables from the image. */
   struct {
     short source;
     bool use_float;
-    char gen_type;
   } image_state;
-
-} UndoImageBuf;
+};
 
 static UndoImageBuf *ubuf_from_image_no_tiles(Image *image, const ImBuf *ibuf)
 {
-  UndoImageBuf *ubuf = MEM_callocN(sizeof(*ubuf), __func__);
+  UndoImageBuf *ubuf = static_cast<UndoImageBuf *>(MEM_callocN(sizeof(*ubuf), __func__));
 
   ubuf->image_dims[0] = ibuf->x;
   ubuf->image_dims[1] = ibuf->y;
@@ -426,12 +468,12 @@ static UndoImageBuf *ubuf_from_image_no_tiles(Image *image, const ImBuf *ibuf)
   ubuf->tiles_dims[1] = ED_IMAGE_UNDO_TILE_NUMBER(ubuf->image_dims[1]);
 
   ubuf->tiles_len = ubuf->tiles_dims[0] * ubuf->tiles_dims[1];
-  ubuf->tiles = MEM_callocN(sizeof(*ubuf->tiles) * ubuf->tiles_len, __func__);
+  ubuf->tiles = static_cast<UndoImageTile **>(
+      MEM_callocN(sizeof(*ubuf->tiles) * ubuf->tiles_len, __func__));
 
   BLI_strncpy(ubuf->ibuf_name, ibuf->name, sizeof(ubuf->ibuf_name));
-  ubuf->image_state.gen_type = image->gen_type;
   ubuf->image_state.source = image->source;
-  ubuf->image_state.use_float = ibuf->rect_float != NULL;
+  ubuf->image_state.use_float = ibuf->rect_float != nullptr;
 
   return ubuf;
 }
@@ -447,7 +489,7 @@ static void ubuf_from_image_all_tiles(UndoImageBuf *ubuf, const ImBuf *ibuf)
     for (uint x_tile = 0; x_tile < ubuf->tiles_dims[0]; x_tile += 1) {
       uint x = x_tile << ED_IMAGE_UNDO_TILE_BITS;
 
-      BLI_assert(ubuf->tiles[i] == NULL);
+      BLI_assert(ubuf->tiles[i] == nullptr);
       UndoImageTile *utile = utile_alloc(has_float);
       utile->users = 1;
       utile_init_from_imbuf(utile, x, y, ibuf, tmpibuf);
@@ -467,7 +509,7 @@ static void ubuf_ensure_compat_ibuf(const UndoImageBuf *ubuf, ImBuf *ibuf)
 {
   /* We could have both float and rect buffers,
    * in this case free the float buffer if it's unused. */
-  if ((ibuf->rect_float != NULL) && (ubuf->image_state.use_float == false)) {
+  if ((ibuf->rect_float != nullptr) && (ubuf->image_state.use_float == false)) {
     imb_freerectfloatImBuf(ibuf);
   }
 
@@ -480,7 +522,7 @@ static void ubuf_ensure_compat_ibuf(const UndoImageBuf *ubuf, ImBuf *ibuf)
   IMB_rect_size_set(ibuf, ubuf->image_dims);
 
   if (ubuf->image_state.use_float) {
-    imb_addrectfloatImBuf(ibuf);
+    imb_addrectfloatImBuf(ibuf, 4);
   }
   else {
     imb_addrectImBuf(ibuf);
@@ -507,7 +549,7 @@ static void ubuf_free(UndoImageBuf *ubuf)
 /** \name Image Undo Handle
  * \{ */
 
-typedef struct UndoImageHandle {
+struct UndoImageHandle {
   struct UndoImageHandle *next, *prev;
 
   /** Each undo handle refers to a single image which may have multiple buffers. */
@@ -522,8 +564,7 @@ typedef struct UndoImageHandle {
    * List of #UndoImageBuf's to support multiple buffers per image.
    */
   ListBase buffers;
-
-} UndoImageHandle;
+};
 
 static void uhandle_restore_list(ListBase *undo_handles, bool use_init)
 {
@@ -533,8 +574,8 @@ static void uhandle_restore_list(ListBase *undo_handles, bool use_init)
     /* Tiles only added to second set of tiles. */
     Image *image = uh->image_ref.ptr;
 
-    ImBuf *ibuf = BKE_image_acquire_ibuf(image, &uh->iuser, NULL);
-    if (UNLIKELY(ibuf == NULL)) {
+    ImBuf *ibuf = BKE_image_acquire_ibuf(image, &uh->iuser, nullptr);
+    if (UNLIKELY(ibuf == nullptr)) {
       CLOG_ERROR(&LOG, "Unable to get buffer for image '%s'", image->id.name + 2);
       continue;
     }
@@ -557,20 +598,20 @@ static void uhandle_restore_list(ListBase *undo_handles, bool use_init)
 
     if (changed) {
       BKE_image_mark_dirty(image, ibuf);
-      /* TODO(jbakker): only mark areas that are actually updated to improve performance. */
+      /* TODO(@jbakker): only mark areas that are actually updated to improve performance. */
       BKE_image_partial_update_mark_full_update(image);
 
       if (ibuf->rect_float) {
-        ibuf->userflags |= IB_RECT_INVALID; /* force recreate of char rect */
+        ibuf->userflags |= IB_RECT_INVALID; /* Force recreate of char `rect` */
       }
       if (ibuf->mipmap[0]) {
-        ibuf->userflags |= IB_MIPMAP_INVALID; /* force mip-map recreation. */
+        ibuf->userflags |= IB_MIPMAP_INVALID; /* Force MIP-MAP recreation. */
       }
       ibuf->userflags |= IB_DISPLAY_BUFFER_INVALID;
 
       DEG_id_tag_update(&image->id, 0);
     }
-    BKE_image_release_ibuf(image, ibuf, NULL);
+    BKE_image_release_ibuf(image, ibuf, nullptr);
   }
 
   IMB_freeImBuf(tmpibuf);
@@ -604,16 +645,16 @@ static UndoImageBuf *uhandle_lookup_ubuf(UndoImageHandle *uh,
       return ubuf;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 static UndoImageBuf *uhandle_add_ubuf(UndoImageHandle *uh, Image *image, ImBuf *ibuf)
 {
-  BLI_assert(uhandle_lookup_ubuf(uh, image, ibuf->name) == NULL);
+  BLI_assert(uhandle_lookup_ubuf(uh, image, ibuf->name) == nullptr);
   UndoImageBuf *ubuf = ubuf_from_image_no_tiles(image, ibuf);
   BLI_addtail(&uh->buffers, ubuf);
 
-  ubuf->post = NULL;
+  ubuf->post = nullptr;
 
   return ubuf;
 }
@@ -621,7 +662,7 @@ static UndoImageBuf *uhandle_add_ubuf(UndoImageHandle *uh, Image *image, ImBuf *
 static UndoImageBuf *uhandle_ensure_ubuf(UndoImageHandle *uh, Image *image, ImBuf *ibuf)
 {
   UndoImageBuf *ubuf = uhandle_lookup_ubuf(uh, image, ibuf->name);
-  if (ubuf == NULL) {
+  if (ubuf == nullptr) {
     ubuf = uhandle_add_ubuf(uh, image, ibuf);
   }
   return ubuf;
@@ -636,7 +677,7 @@ static UndoImageHandle *uhandle_lookup_by_name(ListBase *undo_handles,
       return uh;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 static UndoImageHandle *uhandle_lookup(ListBase *undo_handles, const Image *image, int tile_number)
@@ -646,16 +687,16 @@ static UndoImageHandle *uhandle_lookup(ListBase *undo_handles, const Image *imag
       return uh;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 static UndoImageHandle *uhandle_add(ListBase *undo_handles, Image *image, ImageUser *iuser)
 {
-  BLI_assert(uhandle_lookup(undo_handles, image, iuser->tile) == NULL);
-  UndoImageHandle *uh = MEM_callocN(sizeof(*uh), __func__);
+  BLI_assert(uhandle_lookup(undo_handles, image, iuser->tile) == nullptr);
+  UndoImageHandle *uh = static_cast<UndoImageHandle *>(MEM_callocN(sizeof(*uh), __func__));
   uh->image_ref.ptr = image;
   uh->iuser = *iuser;
-  uh->iuser.scene = NULL;
+  uh->iuser.scene = nullptr;
   BLI_addtail(undo_handles, uh);
   return uh;
 }
@@ -663,7 +704,7 @@ static UndoImageHandle *uhandle_add(ListBase *undo_handles, Image *image, ImageU
 static UndoImageHandle *uhandle_ensure(ListBase *undo_handles, Image *image, ImageUser *iuser)
 {
   UndoImageHandle *uh = uhandle_lookup(undo_handles, image, iuser->tile);
-  if (uh == NULL) {
+  if (uh == nullptr) {
     uh = uhandle_add(undo_handles, image, iuser);
   }
   return uh;
@@ -675,7 +716,7 @@ static UndoImageHandle *uhandle_ensure(ListBase *undo_handles, Image *image, Ima
 /** \name Implements ED Undo System
  * \{ */
 
-typedef struct ImageUndoStep {
+struct ImageUndoStep {
   UndoStep step;
 
   /** #UndoImageHandle */
@@ -685,12 +726,11 @@ typedef struct ImageUndoStep {
    * #PaintTile
    * Run-time only data (active during a paint stroke).
    */
-  ListBase paint_tiles;
+  PaintTileMap *paint_tile_map;
 
   bool is_encode_init;
   ePaintMode paint_mode;
-
-} ImageUndoStep;
+};
 
 /**
  * Find the previous undo buffer from this one.
@@ -703,7 +743,7 @@ static UndoImageBuf *ubuf_lookup_from_reference(ImageUndoStep *us_prev,
 {
   /* Use name lookup because the pointer is cleared for previous steps. */
   UndoImageHandle *uh_prev = uhandle_lookup_by_name(&us_prev->handles, image, tile_number);
-  if (uh_prev != NULL) {
+  if (uh_prev != nullptr) {
     UndoImageBuf *ubuf_reference = uhandle_lookup_ubuf(uh_prev, image, ubuf->ibuf_name);
     if (ubuf_reference) {
       ubuf_reference = ubuf_reference->post;
@@ -713,7 +753,7 @@ static UndoImageBuf *ubuf_lookup_from_reference(ImageUndoStep *us_prev,
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 static bool image_undosys_poll(bContext *C)
@@ -737,11 +777,11 @@ static bool image_undosys_poll(bContext *C)
 
 static void image_undosys_step_encode_init(struct bContext *UNUSED(C), UndoStep *us_p)
 {
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
   /* dummy, memory is cleared anyway. */
   us->is_encode_init = true;
   BLI_listbase_clear(&us->handles);
-  BLI_listbase_clear(&us->paint_tiles);
+  us->paint_tile_map = MEM_new<PaintTileMap>(__func__);
 }
 
 static bool image_undosys_step_encode(struct bContext *C,
@@ -753,7 +793,7 @@ static bool image_undosys_step_encode(struct bContext *C,
    *
    * This function ensures there are previous and current states of the image in the undo buffer.
    */
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
 
   BLI_assert(us->step.data_size == 0);
 
@@ -761,39 +801,40 @@ static bool image_undosys_step_encode(struct bContext *C,
 
     ImBuf *tmpibuf = imbuf_alloc_temp_tile();
 
-    ImageUndoStep *us_reference = (ImageUndoStep *)ED_undo_stack_get()->step_active;
+    ImageUndoStep *us_reference = reinterpret_cast<ImageUndoStep *>(
+        ED_undo_stack_get()->step_active);
     while (us_reference && us_reference->step.type != BKE_UNDOSYS_TYPE_IMAGE) {
-      us_reference = (ImageUndoStep *)us_reference->step.prev;
+      us_reference = reinterpret_cast<ImageUndoStep *>(us_reference->step.prev);
     }
 
     /* Initialize undo tiles from ptiles (if they exist). */
-    for (PaintTile *ptile = us->paint_tiles.first, *ptile_next; ptile; ptile = ptile_next) {
+    for (PaintTile *ptile : us->paint_tile_map->map.values()) {
       if (ptile->valid) {
         UndoImageHandle *uh = uhandle_ensure(&us->handles, ptile->image, &ptile->iuser);
         UndoImageBuf *ubuf_pre = uhandle_ensure_ubuf(uh, ptile->image, ptile->ibuf);
 
-        UndoImageTile *utile = MEM_callocN(sizeof(*utile), "UndoImageTile");
+        UndoImageTile *utile = static_cast<UndoImageTile *>(
+            MEM_callocN(sizeof(*utile), "UndoImageTile"));
         utile->users = 1;
         utile->rect.pt = ptile->rect.pt;
-        ptile->rect.pt = NULL;
+        ptile->rect.pt = nullptr;
         const uint tile_index = index_from_xy(ptile->x_tile, ptile->y_tile, ubuf_pre->tiles_dims);
 
-        BLI_assert(ubuf_pre->tiles[tile_index] == NULL);
+        BLI_assert(ubuf_pre->tiles[tile_index] == nullptr);
         ubuf_pre->tiles[tile_index] = utile;
       }
-      ptile_next = ptile->next;
       ptile_free(ptile);
     }
-    BLI_listbase_clear(&us->paint_tiles);
+    us->paint_tile_map->map.clear();
 
     LISTBASE_FOREACH (UndoImageHandle *, uh, &us->handles) {
       LISTBASE_FOREACH (UndoImageBuf *, ubuf_pre, &uh->buffers) {
 
-        ImBuf *ibuf = BKE_image_acquire_ibuf(uh->image_ref.ptr, &uh->iuser, NULL);
+        ImBuf *ibuf = BKE_image_acquire_ibuf(uh->image_ref.ptr, &uh->iuser, nullptr);
 
         const bool has_float = ibuf->rect_float;
 
-        BLI_assert(ubuf_pre->post == NULL);
+        BLI_assert(ubuf_pre->post == nullptr);
         ubuf_pre->post = ubuf_from_image_no_tiles(uh->image_ref.ptr, ibuf);
         UndoImageBuf *ubuf_post = ubuf_pre->post;
 
@@ -806,7 +847,7 @@ static bool image_undosys_step_encode(struct bContext *C,
           UndoImageBuf *ubuf_reference =
               (us_reference ? ubuf_lookup_from_reference(
                                   us_reference, uh->image_ref.ptr, uh->iuser.tile, ubuf_post) :
-                              NULL);
+                              nullptr);
 
           int i = 0;
           for (uint y_tile = 0; y_tile < ubuf_pre->tiles_dims[1]; y_tile += 1) {
@@ -814,34 +855,35 @@ static bool image_undosys_step_encode(struct bContext *C,
             for (uint x_tile = 0; x_tile < ubuf_pre->tiles_dims[0]; x_tile += 1) {
               uint x = x_tile << ED_IMAGE_UNDO_TILE_BITS;
 
-              if ((ubuf_reference != NULL) && ((ubuf_pre->tiles[i] == NULL) ||
-                                               /* In this case the paint stroke as has added a tile
-                                                * which we have a duplicate reference available. */
-                                               (ubuf_pre->tiles[i]->users == 1))) {
-                if (ubuf_pre->tiles[i] != NULL) {
+              if ((ubuf_reference != nullptr) &&
+                  ((ubuf_pre->tiles[i] == nullptr) ||
+                   /* In this case the paint stroke as has added a tile
+                    * which we have a duplicate reference available. */
+                   (ubuf_pre->tiles[i]->users == 1))) {
+                if (ubuf_pre->tiles[i] != nullptr) {
                   /* If we have a reference, re-use this single use tile for the post state. */
                   BLI_assert(ubuf_pre->tiles[i]->users == 1);
                   ubuf_post->tiles[i] = ubuf_pre->tiles[i];
-                  ubuf_pre->tiles[i] = NULL;
+                  ubuf_pre->tiles[i] = nullptr;
                   utile_init_from_imbuf(ubuf_post->tiles[i], x, y, ibuf, tmpibuf);
                 }
                 else {
-                  BLI_assert(ubuf_post->tiles[i] == NULL);
+                  BLI_assert(ubuf_post->tiles[i] == nullptr);
                   ubuf_post->tiles[i] = ubuf_reference->tiles[i];
                   ubuf_post->tiles[i]->users += 1;
                 }
-                BLI_assert(ubuf_pre->tiles[i] == NULL);
+                BLI_assert(ubuf_pre->tiles[i] == nullptr);
                 ubuf_pre->tiles[i] = ubuf_reference->tiles[i];
                 ubuf_pre->tiles[i]->users += 1;
 
-                BLI_assert(ubuf_pre->tiles[i] != NULL);
-                BLI_assert(ubuf_post->tiles[i] != NULL);
+                BLI_assert(ubuf_pre->tiles[i] != nullptr);
+                BLI_assert(ubuf_post->tiles[i] != nullptr);
               }
               else {
                 UndoImageTile *utile = utile_alloc(has_float);
                 utile_init_from_imbuf(utile, x, y, ibuf, tmpibuf);
 
-                if (ubuf_pre->tiles[i] != NULL) {
+                if (ubuf_pre->tiles[i] != nullptr) {
                   ubuf_post->tiles[i] = utile;
                   utile->users = 1;
                 }
@@ -851,15 +893,15 @@ static bool image_undosys_step_encode(struct bContext *C,
                   utile->users = 2;
                 }
               }
-              BLI_assert(ubuf_pre->tiles[i] != NULL);
-              BLI_assert(ubuf_post->tiles[i] != NULL);
+              BLI_assert(ubuf_pre->tiles[i] != nullptr);
+              BLI_assert(ubuf_post->tiles[i] != nullptr);
               i += 1;
             }
           }
           BLI_assert(i == ubuf_pre->tiles_len);
           BLI_assert(i == ubuf_post->tiles_len);
         }
-        BKE_image_release_ibuf(uh->image_ref.ptr, ibuf, NULL);
+        BKE_image_release_ibuf(uh->image_ref.ptr, ibuf, nullptr);
       }
     }
 
@@ -871,7 +913,7 @@ static bool image_undosys_step_encode(struct bContext *C,
     }
   }
   else {
-    BLI_assert(C != NULL);
+    BLI_assert(C != nullptr);
     /* Happens when switching modes. */
     ePaintMode paint_mode = BKE_paintmode_get_active_from_context(C);
     BLI_assert(ELEM(paint_mode, PAINT_MODE_TEXTURE_2D, PAINT_MODE_TEXTURE_3D));
@@ -942,7 +984,7 @@ static void image_undosys_step_decode(
   /* NOTE: behavior for undo/redo closely matches sculpt undo. */
   BLI_assert(dir != STEP_INVALID);
 
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
   if (dir == STEP_UNDO) {
     image_undosys_step_decode_undo(us, is_final);
   }
@@ -951,7 +993,7 @@ static void image_undosys_step_decode(
   }
 
   if (us->paint_mode == PAINT_MODE_TEXTURE_3D) {
-    ED_object_mode_set_ex(C, OB_MODE_TEXTURE_PAINT, false, NULL);
+    ED_object_mode_set_ex(C, OB_MODE_TEXTURE_PAINT, false, nullptr);
   }
 
   /* Refresh texture slots. */
@@ -963,15 +1005,16 @@ static void image_undosys_step_free(UndoStep *us_p)
   ImageUndoStep *us = (ImageUndoStep *)us_p;
   uhandle_free_list(&us->handles);
 
-  /* Typically this list will have been cleared. */
-  ptile_free_list(&us->paint_tiles);
+  /* Typically this map will have been cleared. */
+  MEM_delete(us->paint_tile_map);
+  us->paint_tile_map = nullptr;
 }
 
 static void image_undosys_foreach_ID_ref(UndoStep *us_p,
                                          UndoTypeForEachIDRefFn foreach_ID_ref_fn,
                                          void *user_data)
 {
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
   LISTBASE_FOREACH (UndoImageHandle *, uh, &us->handles) {
     foreach_ID_ref_fn(user_data, ((UndoRefID *)&uh->image_ref));
   }
@@ -1011,12 +1054,12 @@ void ED_image_undosys_type(UndoType *ut)
  * - So operators can access the pixel-data before the stroke was applied, at run-time.
  * \{ */
 
-ListBase *ED_image_paint_tile_list_get(void)
+PaintTileMap *ED_image_paint_tile_map_get(void)
 {
   UndoStack *ustack = ED_undo_stack_get();
   UndoStep *us_prev = ustack->step_init;
   UndoStep *us_p = BKE_undosys_stack_init_or_active_with_type(ustack, BKE_UNDOSYS_TYPE_IMAGE);
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
   /* We should always have an undo push started when accessing tiles,
    * not doing this means we won't have paint_mode correctly set. */
   BLI_assert(us_p == us_prev);
@@ -1024,24 +1067,24 @@ ListBase *ED_image_paint_tile_list_get(void)
     /* Fallback value until we can be sure this never happens. */
     us->paint_mode = PAINT_MODE_TEXTURE_2D;
   }
-  return &us->paint_tiles;
+  return us->paint_tile_map;
 }
 
 void ED_image_undo_restore(UndoStep *us)
 {
-  ListBase *paint_tiles = &((ImageUndoStep *)us)->paint_tiles;
-  ptile_restore_runtime_list(paint_tiles);
-  ptile_invalidate_list(paint_tiles);
+  PaintTileMap *paint_tile_map = reinterpret_cast<ImageUndoStep *>(us)->paint_tile_map;
+  ptile_restore_runtime_map(paint_tile_map);
+  ptile_invalidate_map(paint_tile_map);
 }
 
 static ImageUndoStep *image_undo_push_begin(const char *name, int paint_mode)
 {
   UndoStack *ustack = ED_undo_stack_get();
-  bContext *C = NULL; /* special case, we never read from this. */
+  bContext *C = nullptr; /* special case, we never read from this. */
   UndoStep *us_p = BKE_undosys_step_push_init_with_type(ustack, C, name, BKE_UNDOSYS_TYPE_IMAGE);
-  ImageUndoStep *us = (ImageUndoStep *)us_p;
+  ImageUndoStep *us = reinterpret_cast<ImageUndoStep *>(us_p);
   BLI_assert(ELEM(paint_mode, PAINT_MODE_TEXTURE_2D, PAINT_MODE_TEXTURE_3D, PAINT_MODE_SCULPT));
-  us->paint_mode = paint_mode;
+  us->paint_mode = (ePaintMode)paint_mode;
   return us;
 }
 
@@ -1060,19 +1103,20 @@ void ED_image_undo_push_begin_with_image(const char *name,
   BLI_assert(BKE_image_get_tile(image, iuser->tile));
   UndoImageHandle *uh = uhandle_ensure(&us->handles, image, iuser);
   UndoImageBuf *ubuf_pre = uhandle_ensure_ubuf(uh, image, ibuf);
-  BLI_assert(ubuf_pre->post == NULL);
+  BLI_assert(ubuf_pre->post == nullptr);
 
-  ImageUndoStep *us_reference = (ImageUndoStep *)ED_undo_stack_get()->step_active;
+  ImageUndoStep *us_reference = reinterpret_cast<ImageUndoStep *>(
+      ED_undo_stack_get()->step_active);
   while (us_reference && us_reference->step.type != BKE_UNDOSYS_TYPE_IMAGE) {
-    us_reference = (ImageUndoStep *)us_reference->step.prev;
+    us_reference = reinterpret_cast<ImageUndoStep *>(us_reference->step.prev);
   }
   UndoImageBuf *ubuf_reference = (us_reference ? ubuf_lookup_from_reference(
                                                      us_reference, image, iuser->tile, ubuf_pre) :
-                                                 NULL);
+                                                 nullptr);
 
   if (ubuf_reference) {
     memcpy(ubuf_pre->tiles, ubuf_reference->tiles, sizeof(*ubuf_pre->tiles) * ubuf_pre->tiles_len);
-    for (uint i = 0; i < ubuf_pre->tiles_len; i++) {
+    for (uint32_t i = 0; i < ubuf_pre->tiles_len; i++) {
       UndoImageTile *utile = ubuf_pre->tiles[i];
       utile->users += 1;
     }
@@ -1085,7 +1129,7 @@ void ED_image_undo_push_begin_with_image(const char *name,
 void ED_image_undo_push_end(void)
 {
   UndoStack *ustack = ED_undo_stack_get();
-  BKE_undosys_step_push(ustack, NULL, NULL);
+  BKE_undosys_step_push(ustack, nullptr, nullptr);
   BKE_undosys_stack_limit_steps_and_memory_defaults(ustack);
   WM_file_tag_modified();
 }
diff --git a/source/blender/editors/space_image/space_image.c b/source/blender/editors/space_image/space_image.c
index 785a5419e04..2b65267644a 100644
--- a/source/blender/editors/space_image/space_image.c
+++ b/source/blender/editors/space_image/space_image.c
@@ -20,6 +20,7 @@
 #include "BKE_colortools.h"
 #include "BKE_context.h"
 #include "BKE_image.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_lib_remap.h"
 #include "BKE_screen.h"
@@ -111,7 +112,8 @@ static SpaceLink *image_create(const ScrArea *UNUSED(area), const Scene *UNUSED(
   simage->tile_grid_shape[0] = 1;
   simage->tile_grid_shape[1] = 1;
 
-  simage->custom_grid_subdiv = 10;
+  simage->custom_grid_subdiv[0] = 10;
+  simage->custom_grid_subdiv[1] = 10;
 
   /* header */
   region = MEM_callocN(sizeof(ARegion), "header for image");
@@ -298,7 +300,7 @@ static void image_listener(const wmSpaceTypeListenerParams *params)
 {
   wmWindow *win = params->window;
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceImage *sima = (SpaceImage *)area->spacedata.first;
 
   /* context changes */
@@ -350,8 +352,10 @@ static void image_listener(const wmSpaceTypeListenerParams *params)
       }
       break;
     case NC_MASK: {
+      Scene *scene = WM_window_get_active_scene(win);
       ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-      Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      Object *obedit = BKE_view_layer_edit_object_get(view_layer);
       if (ED_space_image_check_show_maskedit(sima, obedit)) {
         switch (wmn->data) {
           case ND_SELECT:
@@ -392,8 +396,10 @@ static void image_listener(const wmSpaceTypeListenerParams *params)
       switch (wmn->data) {
         case ND_TRANSFORM:
         case ND_MODIFIER: {
+          const Scene *scene = WM_window_get_active_scene(win);
           ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-          Object *ob = OBACT(view_layer);
+          BKE_view_layer_synced_ensure(scene, view_layer);
+          Object *ob = BKE_view_layer_active_object_get(view_layer);
           if (ob && (ob == wmn->reference) && (ob->mode & OB_MODE_EDIT)) {
             if (sima->lock && (sima->flag & SI_DRAWSHADOW)) {
               ED_area_tag_refresh(area);
@@ -713,7 +719,7 @@ static void image_main_region_listener(const wmRegionListenerParams *params)
 {
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -827,7 +833,7 @@ static void image_buttons_region_draw(const bContext *C, ARegion *region)
 static void image_buttons_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -889,7 +895,7 @@ static void image_tools_region_draw(const bContext *C, ARegion *region)
 static void image_tools_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -945,7 +951,7 @@ static void image_header_region_draw(const bContext *C, ARegion *region)
 static void image_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1028,7 +1034,7 @@ void ED_spacetype_image(void)
   ARegionType *art;
 
   st->spaceid = SPACE_IMAGE;
-  strncpy(st->name, "Image", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Image");
 
   st->create = image_create;
   st->free = image_free;
diff --git a/source/blender/editors/space_info/CMakeLists.txt b/source/blender/editors/space_info/CMakeLists.txt
index febb025f5bd..4e9df2b93b0 100644
--- a/source/blender/editors/space_info/CMakeLists.txt
+++ b/source/blender/editors/space_info/CMakeLists.txt
@@ -14,7 +14,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_info/info_stats.cc b/source/blender/editors/space_info/info_stats.cc
index 29a7eb150a1..9b29ae737c5 100644
--- a/source/blender/editors/space_info/info_stats.cc
+++ b/source/blender/editors/space_info/info_stats.cc
@@ -130,7 +130,7 @@ static void stats_object(Object *ob,
                          SceneStats *stats,
                          GSet *objects_gset)
 {
-  if ((ob->base_flag & BASE_VISIBLE_VIEWLAYER) == 0) {
+  if ((ob->base_flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) == 0) {
     return;
   }
 
@@ -161,42 +161,6 @@ static void stats_object(Object *ob,
         stats->totlampsel++;
       }
       break;
-    case OB_SURF:
-    case OB_CURVES_LEGACY:
-    case OB_FONT: {
-      const Mesh *me_eval = BKE_object_get_evaluated_mesh(ob);
-      if ((me_eval != nullptr) && !BLI_gset_add(objects_gset, (void *)me_eval)) {
-        break;
-      }
-
-      if (stats_mesheval(me_eval, is_selected, stats)) {
-        break;
-      }
-      ATTR_FALLTHROUGH; /* Fall-through to displist. */
-    }
-    case OB_MBALL: {
-      int totv = 0, totf = 0, tottri = 0;
-
-      if (ob->runtime.curve_cache && ob->runtime.curve_cache->disp.first) {
-        /* NOTE: We only get the same curve_cache for instances of the same curve/font/...
-         * For simple linked duplicated objects, each has its own dispList. */
-        if (!BLI_gset_add(objects_gset, ob->runtime.curve_cache)) {
-          break;
-        }
-
-        BKE_displist_count(&ob->runtime.curve_cache->disp, &totv, &totf, &tottri);
-      }
-
-      stats->totvert += totv;
-      stats->totface += totf;
-      stats->tottri += tottri;
-
-      if (is_selected) {
-        stats->totvertsel += totv;
-        stats->totfacesel += totf;
-      }
-      break;
-    }
     case OB_GPENCIL: {
       if (is_selected) {
         bGPdata *gpd = (bGPdata *)ob->data;
@@ -381,7 +345,7 @@ static void stats_object_sculpt(const Object *ob, SceneStats *stats)
       stats->tottri = ob->sculpt->bm->totface;
       break;
     case PBVH_GRIDS:
-      stats->totvertsculpt = BKE_pbvh_get_grid_num_vertices(ss->pbvh);
+      stats->totvertsculpt = BKE_pbvh_get_grid_num_verts(ss->pbvh);
       stats->totfacesculpt = BKE_pbvh_get_grid_num_faces(ss->pbvh);
       break;
   }
@@ -389,19 +353,21 @@ static void stats_object_sculpt(const Object *ob, SceneStats *stats)
 
 /* Statistics displayed in info header. Called regularly on scene changes. */
 static void stats_update(Depsgraph *depsgraph,
+                         const Scene *scene,
                          ViewLayer *view_layer,
                          View3D *v3d_local,
                          SceneStats *stats)
 {
-  const Object *ob = OBACT(view_layer);
-  const Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Object *ob = BKE_view_layer_active_object_get(view_layer);
+  const Object *obedit = BKE_view_layer_edit_object_get(view_layer);
 
   memset(stats, 0x0, sizeof(*stats));
 
   if (obedit) {
     /* Edit Mode. */
-    FOREACH_OBJECT_BEGIN (view_layer, ob_iter) {
-      if (ob_iter->base_flag & BASE_VISIBLE_VIEWLAYER) {
+    FOREACH_OBJECT_BEGIN (scene, view_layer, ob_iter) {
+      if (ob_iter->base_flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) {
         if (ob_iter->mode & OB_MODE_EDIT) {
           stats_object_edit(ob_iter, stats);
           stats->totobjsel++;
@@ -420,8 +386,8 @@ static void stats_update(Depsgraph *depsgraph,
   }
   else if (ob && (ob->mode & OB_MODE_POSE)) {
     /* Pose Mode. */
-    FOREACH_OBJECT_BEGIN (view_layer, ob_iter) {
-      if (ob_iter->base_flag & BASE_VISIBLE_VIEWLAYER) {
+    FOREACH_OBJECT_BEGIN (scene, view_layer, ob_iter) {
+      if (ob_iter->base_flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) {
         if (ob_iter->mode & OB_MODE_POSE) {
           stats_object_pose(ob_iter, stats);
           stats->totobjsel++;
@@ -439,14 +405,7 @@ static void stats_update(Depsgraph *depsgraph,
   }
   else if (ob && (ob->mode & OB_MODE_SCULPT)) {
     /* Sculpt Mode. */
-    if (stats_is_object_dynamic_topology_sculpt(ob)) {
-      /* Dynamic topology. Do not count all vertices,
-       * dynamic topology stats are initialized later as part of sculpt stats. */
-    }
-    else {
-      /* When dynamic topology is not enabled both sculpt stats and scene stats are collected. */
-      stats_object_sculpt(ob, stats);
-    }
+    stats_object_sculpt(ob, stats);
   }
   else {
     /* Objects. */
@@ -493,7 +452,7 @@ static bool format_stats(
     }
     Depsgraph *depsgraph = BKE_scene_ensure_depsgraph(bmain, scene, view_layer);
     *stats_p = (SceneStats *)MEM_mallocN(sizeof(SceneStats), __func__);
-    stats_update(depsgraph, view_layer, v3d_local, *stats_p);
+    stats_update(depsgraph, scene, view_layer, v3d_local, *stats_p);
   }
 
   SceneStats *stats = *stats_p;
@@ -532,13 +491,18 @@ static bool format_stats(
   return true;
 }
 
-static void get_stats_string(
-    char *info, int len, size_t *ofs, ViewLayer *view_layer, SceneStatsFmt *stats_fmt)
+static void get_stats_string(char *info,
+                             int len,
+                             size_t *ofs,
+                             const Scene *scene,
+                             ViewLayer *view_layer,
+                             SceneStatsFmt *stats_fmt)
 {
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Object *obedit = OBEDIT_FROM_OBACT(ob);
   eObjectMode object_mode = ob ? (eObjectMode)ob->mode : OB_MODE_OBJECT;
-  LayerCollection *layer_collection = view_layer->active_collection;
+  LayerCollection *layer_collection = BKE_view_layer_active_collection_get(view_layer);
 
   if (object_mode == OB_MODE_OBJECT) {
     *ofs += BLI_snprintf_rlen(info + *ofs,
@@ -642,7 +606,7 @@ static const char *info_statusbar_string(Main *bmain,
   if (statusbar_flag & STATUSBAR_SHOW_STATS) {
     SceneStatsFmt stats_fmt;
     if (format_stats(bmain, scene, view_layer, nullptr, &stats_fmt)) {
-      get_stats_string(info + ofs, len, &ofs, view_layer, &stats_fmt);
+      get_stats_string(info + ofs, len, &ofs, scene, view_layer, &stats_fmt);
     }
   }
 
@@ -727,7 +691,8 @@ void ED_info_draw_stats(
     return;
   }
 
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Object *obedit = OBEDIT_FROM_OBACT(ob);
   eObjectMode object_mode = ob ? (eObjectMode)ob->mode : OB_MODE_OBJECT;
   const int font_id = BLF_set_default();
diff --git a/source/blender/editors/space_info/space_info.c b/source/blender/editors/space_info/space_info.c
index 73d81c93981..63c8d74c684 100644
--- a/source/blender/editors/space_info/space_info.c
+++ b/source/blender/editors/space_info/space_info.c
@@ -186,7 +186,7 @@ static void info_header_region_draw(const bContext *C, ARegion *region)
 static void info_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -202,7 +202,7 @@ static void info_main_region_listener(const wmRegionListenerParams *params)
 static void info_header_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -254,7 +254,7 @@ void ED_spacetype_info(void)
   ARegionType *art;
 
   st->spaceid = SPACE_INFO;
-  strncpy(st->name, "Info", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Info");
 
   st->create = info_create;
   st->free = info_free;
diff --git a/source/blender/editors/space_info/textview.c b/source/blender/editors/space_info/textview.c
index bc2b539474c..9aa2b84169e 100644
--- a/source/blender/editors/space_info/textview.c
+++ b/source/blender/editors/space_info/textview.c
@@ -74,7 +74,7 @@ static void textview_draw_sel(const char *str,
 
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformColor4ubv(bg_sel);
     immRecti(pos, xy[0] + (cwidth * sta), xy[1] + lheight, xy[0] + (cwidth * end), xy[1]);
@@ -197,7 +197,7 @@ static bool textview_draw_string(TextViewDrawState *tds,
   if (bg) {
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformColor4ubv(bg);
     immRecti(pos, tds->draw_rect_outer->xmin, line_bottom, tds->draw_rect_outer->xmax, line_top);
     immUnbindProgram();
diff --git a/source/blender/editors/space_nla/CMakeLists.txt b/source/blender/editors/space_nla/CMakeLists.txt
index 85a2c3fd0a1..e6995085dbe 100644
--- a/source/blender/editors/space_nla/CMakeLists.txt
+++ b/source/blender/editors/space_nla/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_nla/nla_buttons.c b/source/blender/editors/space_nla/nla_buttons.c
index 9652819404e..a46da391bdc 100644
--- a/source/blender/editors/space_nla/nla_buttons.c
+++ b/source/blender/editors/space_nla/nla_buttons.c
@@ -213,7 +213,9 @@ static bool nla_panel_poll(const bContext *C, PanelType *pt)
 static bool nla_animdata_panel_poll(const bContext *C, PanelType *UNUSED(pt))
 {
   PointerRNA ptr;
-  return (nla_panel_context(C, &ptr, NULL, NULL) && (ptr.data != NULL));
+  PointerRNA strip_ptr;
+  return (nla_panel_context(C, &ptr, NULL, &strip_ptr) && (ptr.data != NULL) &&
+          (ptr.owner_id != strip_ptr.owner_id));
 }
 
 static bool nla_strip_panel_poll(const bContext *C, PanelType *UNUSED(pt))
@@ -265,13 +267,18 @@ static bool nla_strip_eval_panel_poll(const bContext *C, PanelType *UNUSED(pt))
 static void nla_panel_animdata(const bContext *C, Panel *panel)
 {
   PointerRNA adt_ptr;
+  PointerRNA strip_ptr;
   /* AnimData *adt; */
   uiLayout *layout = panel->layout;
   uiLayout *row;
   uiBlock *block;
 
   /* check context and also validity of pointer */
-  if (!nla_panel_context(C, &adt_ptr, NULL, NULL)) {
+  if (!nla_panel_context(C, &adt_ptr, NULL, &strip_ptr)) {
+    return;
+  }
+
+  if (adt_ptr.owner_id == strip_ptr.owner_id) {
     return;
   }
 
diff --git a/source/blender/editors/space_nla/nla_channels.c b/source/blender/editors/space_nla/nla_channels.c
index a0c6a29c422..3c0238806bf 100644
--- a/source/blender/editors/space_nla/nla_channels.c
+++ b/source/blender/editors/space_nla/nla_channels.c
@@ -20,6 +20,7 @@
 #include "BKE_anim_data.h"
 #include "BKE_context.h"
 #include "BKE_global.h"
+#include "BKE_layer.h"
 #include "BKE_nla.h"
 #include "BKE_report.h"
 #include "BKE_scene.h"
@@ -129,7 +130,8 @@ static int mouse_nla_channels(bContext *C, bAnimContext *ac, int channel_index,
         else {
           /* deselect all */
           /* TODO: should this deselect all other types of channels too? */
-          LISTBASE_FOREACH (Base *, b, &view_layer->object_bases) {
+          BKE_view_layer_synced_ensure(ac->scene, view_layer);
+          LISTBASE_FOREACH (Base *, b, BKE_view_layer_object_bases_get(view_layer)) {
             ED_object_base_select(b, BA_DESELECT);
             if (b->object->adt) {
               b->object->adt->flag &= ~(ADT_UI_SELECTED | ADT_UI_ACTIVE);
@@ -478,7 +480,7 @@ void NLA_OT_action_pushdown(wmOperatorType *ot)
                          "Index of NLA action channel to perform pushdown operation on",
                          0,
                          INT_MAX);
-  RNA_def_property_flag(ot->prop, PROP_SKIP_SAVE);
+  RNA_def_property_flag(ot->prop, PROP_SKIP_SAVE | PROP_HIDDEN);
 }
 
 /* ******************** Action Unlink ******************************** */
diff --git a/source/blender/editors/space_nla/nla_draw.c b/source/blender/editors/space_nla/nla_draw.c
index 3b108a3ba8a..f57c9fead56 100644
--- a/source/blender/editors/space_nla/nla_draw.c
+++ b/source/blender/editors/space_nla/nla_draw.c
@@ -22,6 +22,7 @@
 #include "BLI_range.h"
 #include "BLI_utildefines.h"
 
+#include "BKE_action.h"
 #include "BKE_context.h"
 #include "BKE_fcurve.h"
 #include "BKE_nla.h"
@@ -101,7 +102,7 @@ static void nla_action_draw_keyframes(
   GPUVertFormat *format = immVertexFormat();
   uint pos_id = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4fv(color);
 
@@ -178,7 +179,7 @@ static void nla_actionclip_draw_markers(
   const uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   if (dashed) {
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
     float viewport_size[4];
     GPU_viewport_size_get_f(viewport_size);
@@ -189,7 +190,7 @@ static void nla_actionclip_draw_markers(
     immUniform1f("dash_factor", 0.5f);
   }
   else {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   }
   immUniformThemeColorShade(TH_STRIP_SELECT, shade);
 
@@ -377,7 +378,7 @@ static uint nla_draw_use_dashed_outlines(const float color[4], bool muted)
   /* Note that we use dashed shader here, and make it draw solid lines if not muted... */
   uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -441,7 +442,7 @@ static void nla_draw_strip(SpaceNla *snla,
   nla_strip_get_color_inside(adt, strip, color);
 
   shdr_pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* draw extrapolation info first (as backdrop)
    * - but this should only be drawn if track has some contribution
@@ -502,7 +503,7 @@ static void nla_draw_strip(SpaceNla *snla,
 
     /* restore current vertex format & program (roundbox trashes it) */
     shdr_pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   }
   else {
     /* strip is in disabled track - make less visible */
@@ -854,10 +855,11 @@ void draw_nla_main_data(bAnimContext *ac, SpaceNla *snla, ARegion *region)
 
           uint pos = GPU_vertformat_attr_add(
               immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-          immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+          immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
-          /* just draw a semi-shaded rect spanning the width of the viewable area if there's data,
-           * and a second darker rect within which we draw keyframe indicator dots if there's data
+          /* just draw a semi-shaded rect spanning the width of the viewable area, based on if
+           * there's data and the action's extrapolation mode. Draw a second darker rect within
+           * which we draw keyframe indicator dots if there's data.
            */
           GPU_blend(GPU_BLEND_ALPHA);
 
@@ -869,8 +871,26 @@ void draw_nla_main_data(bAnimContext *ac, SpaceNla *snla, ARegion *region)
           /* draw slightly shifted up for greater separation from standard channels,
            * but also slightly shorter for some more contrast when viewing the strips
            */
-          immRectf(
-              pos, v2d->cur.xmin, ymin + NLACHANNEL_SKIP, v2d->cur.xmax, ymax - NLACHANNEL_SKIP);
+          switch (adt->act_extendmode) {
+            case NLASTRIP_EXTEND_HOLD: {
+              immRectf(pos,
+                       v2d->cur.xmin,
+                       ymin + NLACHANNEL_SKIP,
+                       v2d->cur.xmax,
+                       ymax - NLACHANNEL_SKIP);
+              break;
+            }
+            case NLASTRIP_EXTEND_HOLD_FORWARD: {
+              float r_start;
+              float r_end;
+              BKE_action_get_frame_range(ale->data, &r_start, &r_end);
+
+              immRectf(pos, r_end, ymin + NLACHANNEL_SKIP, v2d->cur.xmax, ymax - NLACHANNEL_SKIP);
+              break;
+            }
+            case NLASTRIP_EXTEND_NOTHING:
+              break;
+          }
 
           immUnbindProgram();
 
diff --git a/source/blender/editors/space_nla/nla_edit.c b/source/blender/editors/space_nla/nla_edit.c
index cc45c86ddcd..9df25b1229e 100644
--- a/source/blender/editors/space_nla/nla_edit.c
+++ b/source/blender/editors/space_nla/nla_edit.c
@@ -606,6 +606,36 @@ void NLA_OT_view_frame(wmOperatorType *ot)
  * (or the active block if no space in the track).
  * \{ */
 
+/* Get a list of the editable tracks being shown in the NLA. */
+static int nlaedit_get_editable_tracks(bAnimContext *ac, ListBase *anim_data)
+{
+  const int filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_ACTIVE | ANIMFILTER_FOREDIT |
+                      ANIMFILTER_FCURVESONLY);
+  return ANIM_animdata_filter(ac, anim_data, filter, ac->data, ac->datatype);
+}
+
+static int nlaedit_add_actionclip_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+{
+  /* Get editor data. */
+  bAnimContext ac;
+  if (ANIM_animdata_get_context(C, &ac) == 0) {
+    return OPERATOR_CANCELLED;
+  }
+
+  ListBase anim_data = {NULL, NULL};
+  const size_t items = nlaedit_get_editable_tracks(&ac, &anim_data);
+
+  if (items == 0) {
+    BKE_report(op->reports,
+               RPT_ERROR,
+               "No active track(s) to add strip to, select an existing track or add one before "
+               "trying again");
+    return OPERATOR_CANCELLED;
+  }
+
+  return WM_enum_search_invoke(C, op, event);
+}
+
 /* add the specified action as new strip */
 static int nlaedit_add_actionclip_exec(bContext *C, wmOperator *op)
 {
@@ -615,8 +645,6 @@ static int nlaedit_add_actionclip_exec(bContext *C, wmOperator *op)
 
   ListBase anim_data = {NULL, NULL};
   bAnimListElem *ale;
-  size_t items;
-  int filter;
 
   bAction *act;
 
@@ -654,20 +682,7 @@ static int nlaedit_add_actionclip_exec(bContext *C, wmOperator *op)
    */
   nlaedit_add_tracks_empty(&ac);
 
-  /* get a list of the editable tracks being shown in the NLA
-   * - this is limited to active ones for now, but could be expanded to
-   */
-  filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_ACTIVE | ANIMFILTER_FOREDIT |
-            ANIMFILTER_FCURVESONLY);
-  items = ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
-
-  if (items == 0) {
-    BKE_report(op->reports,
-               RPT_ERROR,
-               "No active track(s) to add strip to, select an existing track or add one before "
-               "trying again");
-    return OPERATOR_CANCELLED;
-  }
+  nlaedit_get_editable_tracks(&ac, &anim_data);
 
   /* for every active track,
    * try to add strip to free space in track or to the top of the stack if no space */
@@ -736,7 +751,7 @@ void NLA_OT_actionclip_add(wmOperatorType *ot)
       "Add an Action-Clip strip (i.e. an NLA Strip referencing an Action) to the active track";
 
   /* api callbacks */
-  ot->invoke = WM_enum_search_invoke;
+  ot->invoke = nlaedit_add_actionclip_invoke;
   ot->exec = nlaedit_add_actionclip_exec;
   ot->poll = nlaop_poll_tweakmode_off;
 
@@ -1216,13 +1231,10 @@ static int nlaedit_duplicate_exec(bContext *C, wmOperator *op)
   return OPERATOR_CANCELLED;
 }
 
-static int nlaedit_duplicate_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+static int nlaedit_duplicate_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
 {
   nlaedit_duplicate_exec(C, op);
 
-  RNA_enum_set(op->ptr, "mode", TFM_TRANSLATION);
-  WM_operator_name_call(C, "TRANSFORM_OT_transform", WM_OP_INVOKE_REGION_WIN, op->ptr, event);
-
   return OPERATOR_FINISHED;
 }
 
@@ -1248,9 +1260,6 @@ void NLA_OT_duplicate(wmOperatorType *ot)
                              false,
                              "Linked",
                              "When duplicating strips, assign new copies of the actions they use");
-
-  /* to give to transform */
-  RNA_def_enum(ot->srna, "mode", rna_enum_transform_mode_types, TFM_TRANSLATION, "Mode", "");
 }
 
 /** \} */
@@ -2204,8 +2213,13 @@ static int nlaedit_apply_scale_exec(bContext *C, wmOperator *UNUSED(op))
         /* setup iterator, and iterate over all the keyframes in the action,
          * applying this scaling */
         ked.data = strip;
-        ANIM_animchanneldata_keyframes_loop(
-            &ked, ac.ads, strip->act, ALE_ACT, NULL, bezt_apply_nlamapping, calchandles_fcurve);
+        ANIM_animchanneldata_keyframes_loop(&ked,
+                                            ac.ads,
+                                            strip->act,
+                                            ALE_ACT,
+                                            NULL,
+                                            bezt_apply_nlamapping,
+                                            BKE_fcurve_handles_recalc);
 
         /* clear scale of strip now that it has been applied,
          * and recalculate the extents of the action now that it has been scaled
diff --git a/source/blender/editors/space_nla/nla_ops.c b/source/blender/editors/space_nla/nla_ops.c
index 902e7a176a3..3ae73282230 100644
--- a/source/blender/editors/space_nla/nla_ops.c
+++ b/source/blender/editors/space_nla/nla_ops.c
@@ -16,6 +16,8 @@
 #include "ED_anim_api.h"
 #include "ED_screen.h"
 
+#include "RNA_access.h"
+
 #include "WM_api.h"
 #include "WM_types.h"
 
@@ -138,6 +140,28 @@ void nla_operatortypes(void)
   WM_operatortype_append(NLA_OT_fmodifier_paste);
 }
 
+void ED_operatormacros_nla()
+{
+  wmOperatorType *ot;
+  wmOperatorTypeMacro *otmacro;
+
+  ot = WM_operatortype_append_macro("NLA_OT_duplicate_move",
+                                    "Duplicate",
+                                    "Duplicate selected strips and their Actions and move them",
+                                    OPTYPE_UNDO | OPTYPE_REGISTER);
+  otmacro = WM_operatortype_macro_define(ot, "NLA_OT_duplicate");
+  RNA_boolean_set(otmacro->ptr, "linked", false);
+  WM_operatortype_macro_define(ot, "TRANSFORM_OT_translate");
+
+  ot = WM_operatortype_append_macro("NLA_OT_duplicate_linked_move",
+                                    "Duplicate Linked",
+                                    "Duplicate selected strips and move them",
+                                    OPTYPE_UNDO | OPTYPE_REGISTER);
+  otmacro = WM_operatortype_macro_define(ot, "NLA_OT_duplicate");
+  RNA_boolean_set(otmacro->ptr, "linked", true);
+  WM_operatortype_macro_define(ot, "TRANSFORM_OT_translate");
+}
+
 /* ************************** registration - keymaps **********************************/
 
 void nla_keymap(wmKeyConfig *keyconf)
diff --git a/source/blender/editors/space_nla/nla_select.c b/source/blender/editors/space_nla/nla_select.c
index a816f8fa4f6..ce93e36474f 100644
--- a/source/blender/editors/space_nla/nla_select.c
+++ b/source/blender/editors/space_nla/nla_select.c
@@ -401,7 +401,7 @@ void NLA_OT_select_box(wmOperatorType *ot)
   ot->poll = nlaop_poll_tweakmode_off;
 
   /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_UNDO;
 
   /* properties */
   RNA_def_boolean(ot->srna, "axis_range", 0, "Axis Range", "");
diff --git a/source/blender/editors/space_nla/space_nla.c b/source/blender/editors/space_nla/space_nla.c
index 13035a9d5fd..e658ddef513 100644
--- a/source/blender/editors/space_nla/space_nla.c
+++ b/source/blender/editors/space_nla/space_nla.c
@@ -79,7 +79,6 @@ static SpaceLink *nla_create(const ScrArea *area, const Scene *scene)
   BLI_addtail(&snla->regionbase, region);
   region->regiontype = RGN_TYPE_UI;
   region->alignment = RGN_ALIGN_RIGHT;
-  region->flag = RGN_FLAG_HIDDEN;
 
   /* main region */
   region = MEM_callocN(sizeof(ARegion), "main region for nla");
@@ -304,7 +303,7 @@ static void nla_buttons_region_draw(const bContext *C, ARegion *region)
 static void nla_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -343,7 +342,7 @@ static void nla_region_listener(const wmRegionListenerParams *params)
 static void nla_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -437,7 +436,7 @@ static void nla_main_region_message_subscribe(const wmRegionMessageSubscribePara
 static void nla_channel_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -513,7 +512,7 @@ static void nla_channel_region_message_subscribe(const wmRegionMessageSubscribeP
 static void nla_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -569,7 +568,7 @@ void ED_spacetype_nla(void)
   ARegionType *art;
 
   st->spaceid = SPACE_NLA;
-  strncpy(st->name, "NLA", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "NLA");
 
   st->create = nla_create;
   st->free = nla_free;
@@ -629,5 +628,8 @@ void ED_spacetype_nla(void)
 
   nla_buttons_register(art);
 
+  art = ED_area_type_hud(st->spaceid);
+  BLI_addhead(&st->regiontypes, art);
+
   BKE_spacetype_register(st);
 }
diff --git a/source/blender/editors/space_node/CMakeLists.txt b/source/blender/editors/space_node/CMakeLists.txt
index badcccca87b..adb03439568 100644
--- a/source/blender/editors/space_node/CMakeLists.txt
+++ b/source/blender/editors/space_node/CMakeLists.txt
@@ -17,7 +17,6 @@ set(INC
   ../../nodes
   ../../render
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -25,6 +24,7 @@ set(INC
 
 
 set(SRC
+  add_node_search.cc
   drawnode.cc
   link_drag_search.cc
   node_add.cc
@@ -50,8 +50,8 @@ set(LIB
   bf_editor_screen
 )
 
-if(WITH_COMPOSITOR)
-  add_definitions(-DWITH_COMPOSITOR)
+if(WITH_COMPOSITOR_CPU)
+  add_definitions(-DWITH_COMPOSITOR_CPU)
 endif()
 
 if(WITH_OPENIMAGEDENOISE)
diff --git a/source/blender/editors/space_node/add_node_search.cc b/source/blender/editors/space_node/add_node_search.cc
new file mode 100644
index 00000000000..101517b8cfb
--- /dev/null
+++ b/source/blender/editors/space_node/add_node_search.cc
@@ -0,0 +1,312 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <optional>
+
+#include "BLI_listbase.h"
+#include "BLI_string_search.h"
+
+#include "DNA_space_types.h"
+
+#include "BKE_asset.h"
+#include "BKE_asset_catalog.hh"
+#include "BKE_asset_library.hh"
+#include "BKE_context.h"
+#include "BKE_idprop.h"
+#include "BKE_lib_id.h"
+#include "BKE_node_tree_update.h"
+#include "BKE_screen.h"
+
+#include "DEG_depsgraph_build.h"
+
+#include "BLT_translation.h"
+
+#include "RNA_access.h"
+
+#include "WM_api.h"
+
+#include "ED_asset.h"
+#include "ED_node.h"
+
+#include "node_intern.hh"
+
+struct bContext;
+
+namespace blender::ed::space_node {
+
+struct AddNodeItem {
+  std::string ui_name;
+  std::string identifier;
+  std::string description;
+  std::optional<AssetHandle> asset;
+  std::function<void(const bContext &, bNodeTree &, bNode &)> after_add_fn;
+  int weight = 0;
+};
+
+struct AddNodeSearchStorage {
+  float2 cursor;
+  bool use_transform;
+  Vector<AddNodeItem> search_add_items;
+  char search[256];
+  bool update_items_tag = true;
+};
+
+static void add_node_search_listen_fn(const wmRegionListenerParams *params, void *arg)
+{
+  AddNodeSearchStorage &storage = *static_cast<AddNodeSearchStorage *>(arg);
+  const wmNotifier *wmn = params->notifier;
+
+  switch (wmn->category) {
+    case NC_ASSET:
+      if (wmn->data == ND_ASSET_LIST_READING) {
+        storage.update_items_tag = true;
+      }
+      break;
+  }
+}
+
+static void search_items_for_asset_metadata(const bNodeTree &node_tree,
+                                            const AssetLibraryReference &library_ref,
+                                            const AssetHandle asset,
+                                            Vector<AddNodeItem> &search_items)
+{
+  const AssetMetaData &asset_data = *ED_asset_handle_get_metadata(&asset);
+  const IDProperty *tree_type = BKE_asset_metadata_idprop_find(&asset_data, "type");
+  if (tree_type == nullptr || IDP_Int(tree_type) != node_tree.type) {
+    return;
+  }
+
+  AddNodeItem item{};
+  item.ui_name = ED_asset_handle_get_name(&asset);
+  item.identifier = node_tree.typeinfo->group_idname;
+  item.description = asset_data.description == nullptr ? "" : asset_data.description;
+  item.asset = asset;
+  item.after_add_fn = [asset, library_ref](const bContext &C, bNodeTree &node_tree, bNode &node) {
+    Main &bmain = *CTX_data_main(&C);
+    node.flag &= ~NODE_OPTIONS;
+    node.id = asset::get_local_id_from_asset_or_append_and_reuse(bmain, library_ref, asset);
+    id_us_plus(node.id);
+    BKE_ntree_update_tag_node_property(&node_tree, &node);
+    DEG_relations_tag_update(&bmain);
+  };
+
+  search_items.append(std::move(item));
+}
+
+static void gather_search_items_for_asset_library(const bContext &C,
+                                                  const bNodeTree &node_tree,
+                                                  const AssetLibraryReference &library_ref,
+                                                  const bool skip_local,
+                                                  Vector<AddNodeItem> &search_items)
+{
+  AssetFilterSettings filter_settings{};
+  filter_settings.id_types = FILTER_ID_NT;
+
+  ED_assetlist_storage_fetch(&library_ref, &C);
+  ED_assetlist_ensure_previews_job(&library_ref, &C);
+  ED_assetlist_iterate(library_ref, [&](AssetHandle asset) {
+    if (!ED_asset_filter_matches_asset(&filter_settings, &asset)) {
+      return true;
+    }
+    if (skip_local && ED_asset_handle_get_local_id(&asset) != nullptr) {
+      return true;
+    }
+    search_items_for_asset_metadata(node_tree, library_ref, asset, search_items);
+    return true;
+  });
+}
+
+static void gather_search_items_for_all_assets(const bContext &C,
+                                               const bNodeTree &node_tree,
+                                               Vector<AddNodeItem> &search_items)
+{
+  int i;
+  LISTBASE_FOREACH_INDEX (const bUserAssetLibrary *, asset_library, &U.asset_libraries, i) {
+    AssetLibraryReference library_ref{};
+    library_ref.custom_library_index = i;
+    library_ref.type = ASSET_LIBRARY_CUSTOM;
+    /* Skip local assets to avoid duplicates when the asset is part of the local file library. */
+    gather_search_items_for_asset_library(C, node_tree, library_ref, true, search_items);
+  }
+
+  AssetLibraryReference library_ref{};
+  library_ref.custom_library_index = -1;
+  library_ref.type = ASSET_LIBRARY_LOCAL;
+  gather_search_items_for_asset_library(C, node_tree, library_ref, false, search_items);
+}
+
+static void gather_add_node_operations(const bContext &C,
+                                       bNodeTree &node_tree,
+                                       Vector<AddNodeItem> &r_search_items)
+{
+  NODE_TYPES_BEGIN (node_type) {
+    const char *disabled_hint;
+    if (!(node_type->poll && node_type->poll(node_type, &node_tree, &disabled_hint))) {
+      continue;
+    }
+
+    AddNodeItem item{};
+    item.ui_name = IFACE_(node_type->ui_name);
+    item.identifier = node_type->idname;
+    item.description = TIP_(node_type->ui_description);
+    r_search_items.append(std::move(item));
+  }
+  NODE_TYPES_END;
+
+  gather_search_items_for_all_assets(C, node_tree, r_search_items);
+}
+
+static void add_node_search_update_fn(
+    const bContext *C, void *arg, const char *str, uiSearchItems *items, const bool is_first)
+{
+  AddNodeSearchStorage &storage = *static_cast<AddNodeSearchStorage *>(arg);
+  if (storage.update_items_tag) {
+    bNodeTree *node_tree = CTX_wm_space_node(C)->edittree;
+    storage.search_add_items.clear();
+    gather_add_node_operations(*C, *node_tree, storage.search_add_items);
+    storage.update_items_tag = false;
+  }
+
+  StringSearch *search = BLI_string_search_new();
+
+  for (AddNodeItem &item : storage.search_add_items) {
+    BLI_string_search_add(search, item.ui_name.c_str(), &item, item.weight);
+  }
+
+  /* Don't filter when the menu is first opened, but still run the search
+   * so the items are in the same order they will appear in while searching. */
+  const char *string = is_first ? "" : str;
+  AddNodeItem **filtered_items;
+  const int filtered_amount = BLI_string_search_query(search, string, (void ***)&filtered_items);
+
+  for (const int i : IndexRange(filtered_amount)) {
+    AddNodeItem &item = *filtered_items[i];
+    if (!UI_search_item_add(items, item.ui_name.c_str(), &item, ICON_NONE, 0, 0)) {
+      break;
+    }
+  }
+
+  MEM_freeN(filtered_items);
+  BLI_string_search_free(search);
+}
+
+static void add_node_search_exec_fn(bContext *C, void *arg1, void *arg2)
+{
+  Main &bmain = *CTX_data_main(C);
+  SpaceNode &snode = *CTX_wm_space_node(C);
+  bNodeTree &node_tree = *snode.edittree;
+  AddNodeSearchStorage &storage = *static_cast<AddNodeSearchStorage *>(arg1);
+  AddNodeItem *item = static_cast<AddNodeItem *>(arg2);
+  if (item == nullptr) {
+    return;
+  }
+
+  node_deselect_all(snode);
+  bNode *new_node = nodeAddNode(C, &node_tree, item->identifier.c_str());
+  BLI_assert(new_node != nullptr);
+
+  if (item->after_add_fn) {
+    item->after_add_fn(*C, node_tree, *new_node);
+  }
+
+  new_node->locx = storage.cursor.x / UI_DPI_FAC;
+  new_node->locy = storage.cursor.y / UI_DPI_FAC + 20 * UI_DPI_FAC;
+
+  nodeSetSelected(new_node, true);
+  nodeSetActive(&node_tree, new_node);
+
+  /* Ideally it would be possible to tag the node tree in some way so it updates only after the
+   * translate operation is finished, but normally moving nodes around doesn't cause updates. */
+  ED_node_tree_propagate_change(C, &bmain, &node_tree);
+
+  if (storage.use_transform) {
+    wmOperatorType *ot = WM_operatortype_find("NODE_OT_translate_attach_remove_on_cancel", true);
+    BLI_assert(ot);
+    PointerRNA ptr;
+    WM_operator_properties_create_ptr(&ptr, ot);
+    WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, nullptr);
+    WM_operator_properties_free(&ptr);
+  }
+}
+
+static ARegion *add_node_search_tooltip_fn(
+    bContext *C, ARegion *region, const rcti *item_rect, void * /*arg*/, void *active)
+{
+  const AddNodeItem *item = static_cast<AddNodeItem *>(active);
+
+  uiSearchItemTooltipData tooltip_data{};
+
+  BLI_strncpy(tooltip_data.description,
+              item->asset ? item->description.c_str() : TIP_(item->description.c_str()),
+              sizeof(tooltip_data.description));
+
+  return UI_tooltip_create_from_search_item_generic(C, region, item_rect, &tooltip_data);
+}
+
+static void add_node_search_free_fn(void *arg)
+{
+  AddNodeSearchStorage *storage = static_cast<AddNodeSearchStorage *>(arg);
+  delete storage;
+}
+
+static uiBlock *create_search_popup_block(bContext *C, ARegion *region, void *arg_op)
+{
+  AddNodeSearchStorage &storage = *(AddNodeSearchStorage *)arg_op;
+
+  uiBlock *block = UI_block_begin(C, region, "_popup", UI_EMBOSS);
+  UI_block_flag_enable(block, UI_BLOCK_LOOP | UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_SEARCH_MENU);
+  UI_block_theme_style_set(block, UI_BLOCK_THEME_STYLE_POPUP);
+
+  uiBut *but = uiDefSearchBut(block,
+                              storage.search,
+                              0,
+                              ICON_VIEWZOOM,
+                              sizeof(storage.search),
+                              10,
+                              10,
+                              UI_searchbox_size_x(),
+                              UI_UNIT_Y,
+                              0,
+                              0,
+                              "");
+  UI_but_func_search_set_sep_string(but, UI_MENU_ARROW_SEP);
+  UI_but_func_search_set(but,
+                         nullptr,
+                         add_node_search_update_fn,
+                         &storage,
+                         false,
+                         add_node_search_free_fn,
+                         add_node_search_exec_fn,
+                         nullptr);
+  UI_but_flag_enable(but, UI_BUT_ACTIVATE_ON_INIT);
+  UI_but_func_search_set_tooltip(but, add_node_search_tooltip_fn);
+  UI_but_func_search_set_listen(but, add_node_search_listen_fn);
+
+  /* Fake button to hold space for the search items. */
+  uiDefBut(block,
+           UI_BTYPE_LABEL,
+           0,
+           "",
+           10,
+           10 - UI_searchbox_size_y(),
+           UI_searchbox_size_x(),
+           UI_searchbox_size_y(),
+           nullptr,
+           0,
+           0,
+           0,
+           0,
+           nullptr);
+
+  const int offset[2] = {0, -UI_UNIT_Y};
+  UI_block_bounds_set_popup(block, 0.3f * U.widget_unit, offset);
+  return block;
+}
+
+void invoke_add_node_search_menu(bContext &C, const float2 &cursor, const bool use_transform)
+{
+  AddNodeSearchStorage *storage = new AddNodeSearchStorage{cursor, use_transform};
+  /* Use the "_ex" variant with `can_refresh` false to avoid a double free when closing Blender. */
+  UI_popup_block_invoke_ex(&C, create_search_popup_block, storage, nullptr, false);
+}
+
+}  // namespace blender::ed::space_node
diff --git a/source/blender/editors/space_node/drawnode.cc b/source/blender/editors/space_node/drawnode.cc
index 66e07c804b6..fbbdd40e92e 100644
--- a/source/blender/editors/space_node/drawnode.cc
+++ b/source/blender/editors/space_node/drawnode.cc
@@ -6,6 +6,7 @@
  * \brief lower level node drawing for nodes (boarders, headers etc), also node layout.
  */
 
+#include "BLI_color.hh"
 #include "BLI_system.h"
 #include "BLI_threads.h"
 
@@ -477,7 +478,7 @@ static void node_shader_set_butfunc(bNodeType *ntype)
     case SH_NODE_RGB:
       ntype->draw_buttons = node_buts_rgb;
       break;
-    case SH_NODE_MIX_RGB:
+    case SH_NODE_MIX_RGB_LEGACY:
       ntype->draw_buttons = node_buts_mix_rgb;
       break;
     case SH_NODE_VALTORGB:
@@ -626,7 +627,7 @@ static void node_composit_backdrop_viewer(
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformColor3f(1.0f, 1.0f, 1.0f);
 
@@ -672,7 +673,7 @@ static void node_composit_backdrop_boxmask(
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3f(1.0f, 1.0f, 1.0f);
 
@@ -717,7 +718,7 @@ static void node_composit_backdrop_ellipsemask(
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor3f(1.0f, 1.0f, 1.0f);
 
@@ -1455,7 +1456,11 @@ static void std_node_socket_interface_draw(bContext *UNUSED(C), uiLayout *layout
     }
     case SOCK_BOOLEAN:
     case SOCK_RGBA:
-    case SOCK_STRING: {
+    case SOCK_STRING:
+    case SOCK_OBJECT:
+    case SOCK_COLLECTION:
+    case SOCK_TEXTURE:
+    case SOCK_MATERIAL: {
       uiItemR(col, ptr, "default_value", DEFAULT_FLAGS, IFACE_("Default"), 0);
       break;
     }
@@ -1565,7 +1570,7 @@ void draw_nodespace_back_pix(const bContext &C,
 
         uint pos = GPU_vertformat_attr_add(
             immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
         immUniformThemeColor(TH_ACTIVE);
 
         immDrawBorderCorners(pos, &pixel_border, 1.0f, 1.0f);
@@ -1580,102 +1585,75 @@ void draw_nodespace_back_pix(const bContext &C,
   GPU_matrix_pop();
 }
 
-bool node_link_bezier_handles(const View2D *v2d,
-                              const SpaceNode *snode,
-                              const bNodeLink &link,
-                              float vec[4][2])
+static float2 socket_link_connection_location(const bNodeSocket &socket, const bNodeLink &link)
 {
-  float cursor[2] = {0.0f, 0.0f};
-
-  /* this function can be called with snode null (via cut_links_intersect) */
-  /* XXX map snode->runtime->cursor back to view space */
-  if (snode) {
-    cursor[0] = snode->runtime->cursor[0] * UI_DPI_FAC;
-    cursor[1] = snode->runtime->cursor[1] * UI_DPI_FAC;
-  }
-
-  /* in v0 and v3 we put begin/end points */
-  if (link.fromsock) {
-    vec[0][0] = link.fromsock->locx;
-    vec[0][1] = link.fromsock->locy;
-    if (link.fromsock->flag & SOCK_MULTI_INPUT) {
-      const float2 position = node_link_calculate_multi_input_position(
-          {link.fromsock->locx, link.fromsock->locy},
-          link.fromsock->total_inputs - 1,
-          link.fromsock->total_inputs);
-      copy_v2_v2(vec[0], position);
-    }
-  }
-  else {
-    if (snode == nullptr) {
-      return false;
-    }
-    copy_v2_v2(vec[0], cursor);
+  const float2 socket_location(socket.locx, socket.locy);
+  if (socket.flag & SOCK_MULTI_INPUT && socket.in_out == SOCK_IN) {
+    return node_link_calculate_multi_input_position(
+        socket_location, link.multi_input_socket_index, socket.total_inputs);
   }
-  if (link.tosock) {
-    vec[3][0] = link.tosock->locx;
-    vec[3][1] = link.tosock->locy;
-    if (!(link.tonode->flag & NODE_HIDDEN) && link.tosock->flag & SOCK_MULTI_INPUT) {
-      const float2 position = node_link_calculate_multi_input_position(
-          {link.tosock->locx, link.tosock->locy},
-          link.multi_input_socket_index,
-          link.tosock->total_inputs);
-      copy_v2_v2(vec[3], position);
-    }
-  }
-  else {
-    if (snode == nullptr) {
-      return false;
-    }
-    copy_v2_v2(vec[3], cursor);
-  }
-
-  /* may be called outside of drawing (so pass spacetype) */
-  int curving = UI_GetThemeValueType(TH_NODE_CURVING, SPACE_NODE);
+  return socket_location;
+}
 
+static void calculate_inner_link_bezier_points(std::array<float2, 4> &points)
+{
+  const int curving = UI_GetThemeValueType(TH_NODE_CURVING, SPACE_NODE);
   if (curving == 0) {
     /* Straight line: align all points. */
-    mid_v2_v2v2(vec[1], vec[0], vec[3]);
-    mid_v2_v2v2(vec[2], vec[1], vec[3]);
-    return true;
+    points[1] = math::interpolate(points[0], points[3], 1.0f / 3.0f);
+    points[2] = math::interpolate(points[0], points[3], 2.0f / 3.0f);
   }
+  else {
+    const float dist = curving * 0.1f * math::distance(points[0].x, points[3].x);
 
-  const float dist = curving * 0.10f * fabsf(vec[0][0] - vec[3][0]);
+    points[1].x = points[0].x + dist;
+    points[1].y = points[0].y;
 
-  vec[1][0] = vec[0][0] + dist;
-  vec[1][1] = vec[0][1];
+    points[2].x = points[3].x - dist;
+    points[2].y = points[3].y;
+  }
+}
 
-  vec[2][0] = vec[3][0] - dist;
-  vec[2][1] = vec[3][1];
+static std::array<float2, 4> node_link_bezier_points(const bNodeLink &link)
+{
+  std::array<float2, 4> points;
+  points[0] = socket_link_connection_location(*link.fromsock, link);
+  points[3] = socket_link_connection_location(*link.tosock, link);
+  calculate_inner_link_bezier_points(points);
+  return points;
+}
 
-  if (v2d && min_ffff(vec[0][0], vec[1][0], vec[2][0], vec[3][0]) > v2d->cur.xmax) {
-    return false; /* clipped */
+static bool node_link_draw_is_visible(const View2D &v2d, const std::array<float2, 4> &points)
+{
+  if (min_ffff(points[0].x, points[1].x, points[2].x, points[3].x) > v2d.cur.xmax) {
+    return false;
   }
-  if (v2d && max_ffff(vec[0][0], vec[1][0], vec[2][0], vec[3][0]) < v2d->cur.xmin) {
-    return false; /* clipped */
+  if (max_ffff(points[0].x, points[1].x, points[2].x, points[3].x) < v2d.cur.xmin) {
+    return false;
   }
-
   return true;
 }
 
-bool node_link_bezier_points(const View2D *v2d,
-                             const SpaceNode *snode,
-                             const bNodeLink &link,
-                             float coord_array[][2],
-                             const int resol)
+void node_link_bezier_points_evaluated(const bNodeLink &link,
+                                       std::array<float2, NODE_LINK_RESOL + 1> &coords)
 {
-  float vec[4][2];
-
-  if (node_link_bezier_handles(v2d, snode, link, vec)) {
-    /* always do all three, to prevent data hanging around */
-    BKE_curve_forward_diff_bezier(
-        vec[0][0], vec[1][0], vec[2][0], vec[3][0], coord_array[0] + 0, resol, sizeof(float[2]));
-    BKE_curve_forward_diff_bezier(
-        vec[0][1], vec[1][1], vec[2][1], vec[3][1], coord_array[0] + 1, resol, sizeof(float[2]));
+  const std::array<float2, 4> points = node_link_bezier_points(link);
 
-    return true;
-  }
-  return false;
+  /* The extra +1 in size is required by these functions and would be removed ideally. */
+  BKE_curve_forward_diff_bezier(points[0].x,
+                                points[1].x,
+                                points[2].x,
+                                points[3].x,
+                                &coords[0].x,
+                                NODE_LINK_RESOL,
+                                sizeof(float2));
+  BKE_curve_forward_diff_bezier(points[0].y,
+                                points[1].y,
+                                points[2].y,
+                                points[3].y,
+                                &coords[0].y,
+                                NODE_LINK_RESOL,
+                                sizeof(float2));
 }
 
 #define NODELINK_GROUP_SIZE 256
@@ -1934,187 +1912,250 @@ void nodelink_batch_end(SpaceNode &snode)
   g_batch_link.enabled = false;
 }
 
+struct NodeLinkDrawConfig {
+  int th_col1;
+  int th_col2;
+  int th_col3;
+
+  ColorTheme4f start_color;
+  ColorTheme4f end_color;
+  ColorTheme4f outline_color;
+
+  bool drawarrow;
+  bool drawmuted;
+  bool highlighted;
+
+  float dim_factor;
+  float thickness;
+  float dash_factor;
+  float dash_alpha;
+};
+
 static void nodelink_batch_add_link(const SpaceNode &snode,
-                                    const float2 &p0,
-                                    const float2 &p1,
-                                    const float2 &p2,
-                                    const float2 &p3,
-                                    int th_col1,
-                                    int th_col2,
-                                    int th_col3,
-                                    const float start_color[4],
-                                    const float end_color[4],
-                                    bool drawarrow,
-                                    bool drawmuted,
-                                    float dim_factor,
-                                    float thickness,
-                                    float dash_factor,
-                                    float dash_alpha)
+                                    const std::array<float2, 4> &points,
+                                    const NodeLinkDrawConfig &draw_config)
 {
   /* Only allow these colors. If more is needed, you need to modify the shader accordingly. */
-  BLI_assert(ELEM(th_col1, TH_WIRE_INNER, TH_WIRE, TH_ACTIVE, TH_EDGE_SELECT, TH_REDALERT));
-  BLI_assert(ELEM(th_col2, TH_WIRE_INNER, TH_WIRE, TH_ACTIVE, TH_EDGE_SELECT, TH_REDALERT));
-  BLI_assert(ELEM(th_col3, TH_WIRE, TH_REDALERT, -1));
+  BLI_assert(
+      ELEM(draw_config.th_col1, TH_WIRE_INNER, TH_WIRE, TH_ACTIVE, TH_EDGE_SELECT, TH_REDALERT));
+  BLI_assert(
+      ELEM(draw_config.th_col2, TH_WIRE_INNER, TH_WIRE, TH_ACTIVE, TH_EDGE_SELECT, TH_REDALERT));
+  BLI_assert(ELEM(draw_config.th_col3, TH_WIRE, TH_REDALERT, -1));
 
   g_batch_link.count++;
-  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p0_step), p0);
-  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p1_step), p1);
-  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p2_step), p2);
-  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p3_step), p3);
+  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p0_step), points[0]);
+  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p1_step), points[1]);
+  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p2_step), points[2]);
+  copy_v2_v2((float *)GPU_vertbuf_raw_step(&g_batch_link.p3_step), points[3]);
   char *colid = (char *)GPU_vertbuf_raw_step(&g_batch_link.colid_step);
-  colid[0] = nodelink_get_color_id(th_col1);
-  colid[1] = nodelink_get_color_id(th_col2);
-  colid[2] = nodelink_get_color_id(th_col3);
-  colid[3] = drawarrow;
-  copy_v4_v4((float *)GPU_vertbuf_raw_step(&g_batch_link.start_color_step), start_color);
-  copy_v4_v4((float *)GPU_vertbuf_raw_step(&g_batch_link.end_color_step), end_color);
+  colid[0] = nodelink_get_color_id(draw_config.th_col1);
+  colid[1] = nodelink_get_color_id(draw_config.th_col2);
+  colid[2] = nodelink_get_color_id(draw_config.th_col3);
+  colid[3] = draw_config.drawarrow;
+  copy_v4_v4((float *)GPU_vertbuf_raw_step(&g_batch_link.start_color_step),
+             draw_config.start_color);
+  copy_v4_v4((float *)GPU_vertbuf_raw_step(&g_batch_link.end_color_step), draw_config.end_color);
   char *muted = (char *)GPU_vertbuf_raw_step(&g_batch_link.muted_step);
-  muted[0] = drawmuted;
-  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dim_factor_step) = dim_factor;
-  *(float *)GPU_vertbuf_raw_step(&g_batch_link.thickness_step) = thickness;
-  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dash_factor_step) = dash_factor;
-  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dash_alpha_step) = dash_alpha;
+  muted[0] = draw_config.drawmuted;
+  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dim_factor_step) = draw_config.dim_factor;
+  *(float *)GPU_vertbuf_raw_step(&g_batch_link.thickness_step) = draw_config.thickness;
+  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dash_factor_step) = draw_config.dash_factor;
+  *(float *)GPU_vertbuf_raw_step(&g_batch_link.dash_alpha_step) = draw_config.dash_alpha;
 
   if (g_batch_link.count == NODELINK_GROUP_SIZE) {
     nodelink_batch_draw(snode);
   }
 }
 
-void node_draw_link_bezier(const bContext &C,
-                           const View2D &v2d,
-                           const SpaceNode &snode,
-                           const bNodeLink &link,
-                           const int th_col1,
-                           const int th_col2,
-                           const int th_col3,
-                           const bool selected)
+static void node_draw_link_end_marker(const float2 center,
+                                      const float radius,
+                                      const ColorTheme4f &color)
 {
-  const float dim_factor = selected ? 1.0f : node_link_dim_factor(v2d, link);
-  float thickness = 1.5f;
-  float dash_factor = 1.0f;
+  rctf rect;
+  BLI_rctf_init(&rect, center.x - radius, center.x + radius, center.y - radius, center.y + radius);
+
+  UI_draw_roundbox_corner_set(UI_CNR_ALL);
+  UI_draw_roundbox_4fv(&rect, true, radius, color);
+  /* Roundbox disables alpha. Reenable it for node links that are drawn after this one. */
+  GPU_blend(GPU_BLEND_ALPHA);
+}
+
+static void node_draw_link_end_markers(const bNodeLink &link,
+                                       const NodeLinkDrawConfig &draw_config,
+                                       const std::array<float2, 4> &points,
+                                       const bool outline)
+{
+  const float radius = (outline ? 0.65f : 0.45f) * NODE_SOCKSIZE;
+  if (link.fromsock) {
+    node_draw_link_end_marker(
+        points[0], radius, outline ? draw_config.outline_color : draw_config.start_color);
+  }
+  if (link.tosock) {
+    node_draw_link_end_marker(
+        points[3], radius, outline ? draw_config.outline_color : draw_config.end_color);
+  }
+}
+
+static bool node_link_is_field_link(const SpaceNode &snode, const bNodeLink &link)
+{
+  if (snode.edittree->type != NTREE_GEOMETRY) {
+    return false;
+  }
+  if (link.fromsock && link.fromsock->display_shape == SOCK_DISPLAY_SHAPE_DIAMOND) {
+    return true;
+  }
+  return false;
+}
+
+static NodeLinkDrawConfig nodelink_get_draw_config(const bContext &C,
+                                                   const View2D &v2d,
+                                                   const SpaceNode &snode,
+                                                   const bNodeLink &link,
+                                                   const int th_col1,
+                                                   const int th_col2,
+                                                   const int th_col3,
+                                                   const bool selected)
+{
+  NodeLinkDrawConfig draw_config;
+
+  draw_config.th_col1 = th_col1;
+  draw_config.th_col2 = th_col2;
+  draw_config.th_col3 = th_col3;
+
+  draw_config.dim_factor = selected ? 1.0f : node_link_dim_factor(v2d, link);
 
   bTheme *btheme = UI_GetTheme();
-  const float dash_alpha = btheme->space_node.dash_alpha;
-
-  if (snode.edittree->type == NTREE_GEOMETRY) {
-    if (link.fromsock && link.fromsock->display_shape == SOCK_DISPLAY_SHAPE_DIAMOND) {
-      /* Make field links a bit thinner. */
-      thickness = 1.0f;
-      /* Draw field as dashes. */
-      dash_factor = 0.75f;
+  draw_config.dash_alpha = btheme->space_node.dash_alpha;
+
+  const bool field_link = node_link_is_field_link(snode, link);
+
+  draw_config.dash_factor = field_link ? 0.75f : 1.0f;
+
+  const float scale = UI_view2d_scale_get_x(&v2d);
+  /* Clamp the thickness to make the links more readable when zooming out. */
+  draw_config.thickness = max_ff(scale, 1.0f) * (field_link ? 0.7f : 1.0f);
+  draw_config.highlighted = link.flag & NODE_LINK_TEMP_HIGHLIGHT;
+  draw_config.drawarrow = ((link.tonode && (link.tonode->type == NODE_REROUTE)) &&
+                           (link.fromnode && (link.fromnode->type == NODE_REROUTE)));
+  draw_config.drawmuted = (link.flag & NODE_LINK_MUTED);
+
+  UI_GetThemeColor4fv(th_col3, draw_config.outline_color);
+
+  if (snode.overlay.flag & SN_OVERLAY_SHOW_OVERLAYS &&
+      snode.overlay.flag & SN_OVERLAY_SHOW_WIRE_COLORS) {
+    PointerRNA from_node_ptr, to_node_ptr;
+    RNA_pointer_create((ID *)snode.edittree, &RNA_Node, link.fromnode, &from_node_ptr);
+    RNA_pointer_create((ID *)snode.edittree, &RNA_Node, link.tonode, &to_node_ptr);
+
+    if (link.fromsock) {
+      node_socket_color_get(
+          C, *snode.edittree, from_node_ptr, *link.fromsock, draw_config.start_color);
+    }
+    else {
+      node_socket_color_get(
+          C, *snode.edittree, to_node_ptr, *link.tosock, draw_config.start_color);
     }
-  }
 
-  float vec[4][2];
-  const bool highlighted = link.flag & NODE_LINK_TEMP_HIGHLIGHT;
-  if (node_link_bezier_handles(&v2d, &snode, link, vec)) {
-    int drawarrow = ((link.tonode && (link.tonode->type == NODE_REROUTE)) &&
-                     (link.fromnode && (link.fromnode->type == NODE_REROUTE)));
-    int drawmuted = (link.flag & NODE_LINK_MUTED);
-    if (g_batch_link.batch == nullptr) {
-      nodelink_batch_init();
+    if (link.tosock) {
+      node_socket_color_get(C, *snode.edittree, to_node_ptr, *link.tosock, draw_config.end_color);
     }
-    /* Draw single link. */
-    float colors[3][4] = {{0.0f}};
-    if (th_col3 != -1) {
-      UI_GetThemeColor4fv(th_col3, colors[0]);
+    else {
+      node_socket_color_get(
+          C, *snode.edittree, from_node_ptr, *link.fromsock, draw_config.end_color);
     }
+  }
+  else {
+    UI_GetThemeColor4fv(th_col1, draw_config.start_color);
+    UI_GetThemeColor4fv(th_col2, draw_config.end_color);
+  }
+
+  /* Highlight links connected to selected nodes. */
+  if (selected) {
+    ColorTheme4f color_selected;
+    UI_GetThemeColor4fv(TH_EDGE_SELECT, color_selected);
+    const float alpha = color_selected.a;
 
-    if (snode.overlay.flag & SN_OVERLAY_SHOW_OVERLAYS &&
-        snode.overlay.flag & SN_OVERLAY_SHOW_WIRE_COLORS) {
-      PointerRNA from_node_ptr, to_node_ptr;
-      RNA_pointer_create((ID *)snode.edittree, &RNA_Node, link.fromnode, &from_node_ptr);
-      RNA_pointer_create((ID *)snode.edittree, &RNA_Node, link.tonode, &to_node_ptr);
+    /* Interpolate color if highlight color is not fully transparent. */
+    if (alpha != 0.0) {
       if (link.fromsock) {
-        node_socket_color_get(C, *snode.edittree, from_node_ptr, *link.fromsock, colors[1]);
-      }
-      else {
-        node_socket_color_get(C, *snode.edittree, to_node_ptr, *link.tosock, colors[1]);
+        interp_v3_v3v3(draw_config.start_color, draw_config.start_color, color_selected, alpha);
       }
-
       if (link.tosock) {
-        node_socket_color_get(C, *snode.edittree, to_node_ptr, *link.tosock, colors[2]);
-      }
-      else {
-        node_socket_color_get(C, *snode.edittree, from_node_ptr, *link.fromsock, colors[2]);
+        interp_v3_v3v3(draw_config.end_color, draw_config.end_color, color_selected, alpha);
       }
     }
-    else {
-      UI_GetThemeColor4fv(th_col1, colors[1]);
-      UI_GetThemeColor4fv(th_col2, colors[2]);
-    }
+  }
 
-    /* Highlight links connected to selected nodes. */
-    if (selected) {
-      float color_selected[4];
-      UI_GetThemeColor4fv(TH_EDGE_SELECT, color_selected);
-      const float alpha = color_selected[3];
+  if (draw_config.highlighted) {
+    ColorTheme4f link_preselection_highlight_color;
+    UI_GetThemeColor4fv(TH_SELECT, link_preselection_highlight_color);
+    /* Multi sockets can only be inputs. So we only have to highlight the end of the link. */
+    copy_v4_v4(draw_config.end_color, link_preselection_highlight_color);
+  }
 
-      /* Interpolate color if highlight color is not fully transparent. */
-      if (alpha != 0.0) {
-        if (link.fromsock) {
-          interp_v3_v3v3(colors[1], colors[1], color_selected, alpha);
-        }
-        if (link.tosock) {
-          interp_v3_v3v3(colors[2], colors[2], color_selected, alpha);
-        }
-      }
-    }
+  return draw_config;
+}
 
-    if (g_batch_link.enabled && !highlighted) {
-      /* Add link to batch. */
-      nodelink_batch_add_link(snode,
-                              vec[0],
-                              vec[1],
-                              vec[2],
-                              vec[3],
-                              th_col1,
-                              th_col2,
-                              th_col3,
-                              colors[1],
-                              colors[2],
-                              drawarrow,
-                              drawmuted,
-                              dim_factor,
-                              thickness,
-                              dash_factor,
-                              dash_alpha);
-    }
-    else {
-      if (highlighted) {
-        float link_preselection_highlight_color[4];
-        UI_GetThemeColor4fv(TH_SELECT, link_preselection_highlight_color);
-        copy_v4_v4(colors[2], link_preselection_highlight_color);
-      }
+static void node_draw_link_bezier_ex(const SpaceNode &snode,
+                                     const NodeLinkDrawConfig &draw_config,
+                                     const std::array<float2, 4> &points)
+{
+  if (g_batch_link.batch == nullptr) {
+    nodelink_batch_init();
+  }
 
-      NodeLinkData node_link_data;
-      for (int i = 0; i < 4; i++) {
-        copy_v2_v2(node_link_data.bezierPts[i], vec[i]);
-      }
-      for (int i = 0; i < 3; i++) {
-        copy_v4_v4(node_link_data.colors[i], colors[i]);
-      }
-      node_link_data.doArrow = drawarrow;
-      node_link_data.doMuted = drawmuted;
-      node_link_data.dim_factor = dim_factor;
-      node_link_data.thickness = thickness;
-      node_link_data.dash_factor = dash_factor;
-      node_link_data.dash_alpha = dash_alpha;
-      node_link_data.expandSize = snode.runtime->aspect * LINK_WIDTH;
-      node_link_data.arrowSize = ARROW_SIZE;
-
-      GPUBatch *batch = g_batch_link.batch_single;
-      GPUUniformBuf *ubo = GPU_uniformbuf_create_ex(
-          sizeof(NodeLinkData), &node_link_data, __func__);
-
-      GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_NODELINK);
-      GPU_batch_uniformbuf_bind(batch, "node_link_data", ubo);
-      GPU_batch_draw(batch);
-
-      GPU_uniformbuf_unbind(ubo);
-      GPU_uniformbuf_free(ubo);
+  if (g_batch_link.enabled && !draw_config.highlighted) {
+    /* Add link to batch. */
+    nodelink_batch_add_link(snode, points, draw_config);
+  }
+  else {
+    NodeLinkData node_link_data;
+    for (const int i : IndexRange(points.size())) {
+      copy_v2_v2(node_link_data.bezierPts[i], points[i]);
     }
+
+    copy_v4_v4(node_link_data.colors[0], draw_config.outline_color);
+    copy_v4_v4(node_link_data.colors[1], draw_config.start_color);
+    copy_v4_v4(node_link_data.colors[2], draw_config.end_color);
+
+    node_link_data.doArrow = draw_config.drawarrow;
+    node_link_data.doMuted = draw_config.drawmuted;
+    node_link_data.dim_factor = draw_config.dim_factor;
+    node_link_data.thickness = draw_config.thickness;
+    node_link_data.dash_factor = draw_config.dash_factor;
+    node_link_data.dash_alpha = draw_config.dash_alpha;
+    node_link_data.expandSize = snode.runtime->aspect * LINK_WIDTH;
+    node_link_data.arrowSize = ARROW_SIZE;
+
+    GPUBatch *batch = g_batch_link.batch_single;
+    GPUUniformBuf *ubo = GPU_uniformbuf_create_ex(sizeof(NodeLinkData), &node_link_data, __func__);
+
+    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_NODELINK);
+    GPU_batch_uniformbuf_bind(batch, "node_link_data", ubo);
+    GPU_batch_draw(batch);
+
+    GPU_uniformbuf_unbind(ubo);
+    GPU_uniformbuf_free(ubo);
+  }
+}
+
+void node_draw_link_bezier(const bContext &C,
+                           const View2D &v2d,
+                           const SpaceNode &snode,
+                           const bNodeLink &link,
+                           const int th_col1,
+                           const int th_col2,
+                           const int th_col3,
+                           const bool selected)
+{
+  const std::array<float2, 4> points = node_link_bezier_points(link);
+  if (!node_link_draw_is_visible(v2d, points)) {
+    return;
   }
+  const NodeLinkDrawConfig draw_config = nodelink_get_draw_config(
+      C, v2d, snode, link, th_col1, th_col2, th_col3, selected);
+
+  node_draw_link_bezier_ex(snode, draw_config, points);
 }
 
 void node_draw_link(const bContext &C,
@@ -2129,34 +2170,29 @@ void node_draw_link(const bContext &C,
     return;
   }
 
-  /* new connection */
-  if (!link.fromsock || !link.tosock) {
-    th_col1 = th_col2 = TH_ACTIVE;
+  /* going to give issues once... */
+  if (link.tosock->flag & SOCK_UNAVAIL) {
+    return;
+  }
+  if (link.fromsock->flag & SOCK_UNAVAIL) {
+    return;
   }
-  else {
-    /* going to give issues once... */
-    if (link.tosock->flag & SOCK_UNAVAIL) {
-      return;
-    }
-    if (link.fromsock->flag & SOCK_UNAVAIL) {
-      return;
-    }
 
-    if (link.flag & NODE_LINK_VALID) {
-      /* special indicated link, on drop-node */
-      if (link.flag & NODE_LINKFLAG_HILITE) {
-        th_col1 = th_col2 = TH_ACTIVE;
-      }
-      else if (link.flag & NODE_LINK_MUTED) {
-        th_col1 = th_col2 = TH_REDALERT;
-      }
+  if (link.flag & NODE_LINK_VALID) {
+    /* special indicated link, on drop-node */
+    if (link.flag & NODE_LINKFLAG_HILITE) {
+      th_col1 = th_col2 = TH_ACTIVE;
     }
-    else {
-      /* Invalid link. */
-      th_col1 = th_col2 = th_col3 = TH_REDALERT;
-      // th_col3 = -1; /* no shadow */
+    else if (link.flag & NODE_LINK_MUTED) {
+      th_col1 = th_col2 = TH_REDALERT;
     }
   }
+  else {
+    /* Invalid link. */
+    th_col1 = th_col2 = th_col3 = TH_REDALERT;
+    // th_col3 = -1; /* no shadow */
+  }
+
   /* Links from field to non-field sockets are not allowed. */
   if (snode.edittree->type == NTREE_GEOMETRY && !(link.flag & NODE_LINK_DRAGGED)) {
     if ((link.fromsock && link.fromsock->display_shape == SOCK_DISPLAY_SHAPE_DIAMOND) &&
@@ -2168,6 +2204,38 @@ void node_draw_link(const bContext &C,
   node_draw_link_bezier(C, v2d, snode, link, th_col1, th_col2, th_col3, selected);
 }
 
+static std::array<float2, 4> node_link_bezier_points_dragged(const SpaceNode &snode,
+                                                             const bNodeLink &link)
+{
+  const float2 cursor = snode.runtime->cursor * UI_DPI_FAC;
+  std::array<float2, 4> points;
+  points[0] = link.fromsock ? socket_link_connection_location(*link.fromsock, link) : cursor;
+  points[3] = link.tosock ? socket_link_connection_location(*link.tosock, link) : cursor;
+  calculate_inner_link_bezier_points(points);
+  return points;
+}
+
+void node_draw_link_dragged(const bContext &C,
+                            const View2D &v2d,
+                            const SpaceNode &snode,
+                            const bNodeLink &link)
+{
+  if (link.fromsock == nullptr && link.tosock == nullptr) {
+    return;
+  }
+
+  const std::array<float2, 4> points = node_link_bezier_points_dragged(snode, link);
+
+  const NodeLinkDrawConfig draw_config = nodelink_get_draw_config(
+      C, v2d, snode, link, TH_ACTIVE, TH_ACTIVE, TH_WIRE, true);
+  /* End marker outline. */
+  node_draw_link_end_markers(link, draw_config, points, true);
+  /* Link. */
+  node_draw_link_bezier_ex(snode, draw_config, points);
+  /* End marker fill. */
+  node_draw_link_end_markers(link, draw_config, points, false);
+}
+
 }  // namespace blender::ed::space_node
 
 void ED_node_draw_snap(View2D *v2d, const float cent[2], float size, NodeBorder border, uint pos)
diff --git a/source/blender/editors/space_node/link_drag_search.cc b/source/blender/editors/space_node/link_drag_search.cc
index c524de2c55d..17410937d4c 100644
--- a/source/blender/editors/space_node/link_drag_search.cc
+++ b/source/blender/editors/space_node/link_drag_search.cc
@@ -5,7 +5,12 @@
 
 #include "DNA_space_types.h"
 
+#include "BKE_asset.h"
 #include "BKE_context.h"
+#include "BKE_idprop.h"
+#include "BKE_lib_id.h"
+#include "BKE_node_tree_update.h"
+#include "BKE_screen.h"
 
 #include "NOD_socket_search_link.hh"
 
@@ -15,6 +20,9 @@
 
 #include "WM_api.h"
 
+#include "DEG_depsgraph_build.h"
+
+#include "ED_asset.h"
 #include "ED_node.h"
 
 #include "node_intern.hh"
@@ -29,6 +37,7 @@ struct LinkDragSearchStorage {
   float2 cursor;
   Vector<SocketLinkOperation> search_link_ops;
   char search[256];
+  bool update_items_tag = true;
 
   eNodeSocketInOut in_out() const
   {
@@ -36,6 +45,20 @@ struct LinkDragSearchStorage {
   }
 };
 
+static void link_drag_search_listen_fn(const wmRegionListenerParams *params, void *arg)
+{
+  LinkDragSearchStorage &storage = *static_cast<LinkDragSearchStorage *>(arg);
+  const wmNotifier *wmn = params->notifier;
+
+  switch (wmn->category) {
+    case NC_ASSET:
+      if (wmn->data == ND_ASSET_LIST_READING) {
+        storage.update_items_tag = true;
+      }
+      break;
+  }
+}
+
 static void add_reroute_node_fn(nodes::LinkSearchOpParams &params)
 {
   bNode &reroute = params.add_node("NodeReroute");
@@ -112,11 +135,137 @@ static void add_existing_group_input_fn(nodes::LinkSearchOpParams &params,
 }
 
 /**
+ * \note This could use #search_link_ops_for_socket_templates, but we have to store the inputs and
+ * outputs as IDProperties for assets because of asset indexing, so that's all we have without
+ * loading the file.
+ */
+static void search_link_ops_for_asset_metadata(const bNodeTree &node_tree,
+                                               const bNodeSocket &socket,
+                                               const AssetLibraryReference &library_ref,
+                                               const AssetHandle asset,
+                                               Vector<SocketLinkOperation> &search_link_ops)
+{
+  const AssetMetaData &asset_data = *ED_asset_handle_get_metadata(&asset);
+  const IDProperty *tree_type = BKE_asset_metadata_idprop_find(&asset_data, "type");
+  if (tree_type == nullptr || IDP_Int(tree_type) != node_tree.type) {
+    return;
+  }
+
+  const bNodeTreeType &node_tree_type = *node_tree.typeinfo;
+  const eNodeSocketInOut in_out = socket.in_out == SOCK_OUT ? SOCK_IN : SOCK_OUT;
+
+  const IDProperty *sockets = BKE_asset_metadata_idprop_find(
+      &asset_data, in_out == SOCK_IN ? "inputs" : "outputs");
+
+  int weight = -1;
+  Set<StringRef> socket_names;
+  LISTBASE_FOREACH (IDProperty *, socket_property, &sockets->data.group) {
+    if (socket_property->type != IDP_STRING) {
+      continue;
+    }
+    const char *socket_idname = IDP_String(socket_property);
+    const bNodeSocketType *socket_type = nodeSocketTypeFind(socket_idname);
+    if (socket_type == nullptr) {
+      continue;
+    }
+    eNodeSocketDatatype from = (eNodeSocketDatatype)socket.type;
+    eNodeSocketDatatype to = (eNodeSocketDatatype)socket_type->type;
+    if (socket.in_out == SOCK_OUT) {
+      std::swap(from, to);
+    }
+    if (node_tree_type.validate_link && !node_tree_type.validate_link(from, to)) {
+      continue;
+    }
+    if (!socket_names.add(socket_property->name)) {
+      /* See comment in #search_link_ops_for_declarations. */
+      continue;
+    }
+
+    const StringRef asset_name = ED_asset_handle_get_name(&asset);
+    const StringRef socket_name = socket_property->name;
+
+    search_link_ops.append(
+        {asset_name + " " + UI_MENU_ARROW_SEP + socket_name,
+         [library_ref, asset, socket_property, in_out](nodes::LinkSearchOpParams &params) {
+           Main &bmain = *CTX_data_main(&params.C);
+
+           bNode &node = params.add_node(params.node_tree.typeinfo->group_idname);
+           node.flag &= ~NODE_OPTIONS;
+
+           node.id = asset::get_local_id_from_asset_or_append_and_reuse(bmain, library_ref, asset);
+           id_us_plus(node.id);
+           BKE_ntree_update_tag_node_property(&params.node_tree, &node);
+           DEG_relations_tag_update(&bmain);
+
+           /* Create the inputs and outputs on the new node. */
+           node.typeinfo->group_update_func(&params.node_tree, &node);
+
+           bNodeSocket *new_node_socket = bke::node_find_enabled_socket(
+               node, in_out, socket_property->name);
+           if (new_node_socket != nullptr) {
+             /* Rely on the way #nodeAddLink switches in/out if necessary. */
+             nodeAddLink(&params.node_tree, &params.node, &params.socket, &node, new_node_socket);
+           }
+         },
+         weight});
+
+    weight--;
+  }
+}
+
+static void gather_search_link_ops_for_asset_library(const bContext &C,
+                                                     const bNodeTree &node_tree,
+                                                     const bNodeSocket &socket,
+                                                     const AssetLibraryReference &library_ref,
+                                                     const bool skip_local,
+                                                     Vector<SocketLinkOperation> &search_link_ops)
+{
+  AssetFilterSettings filter_settings{};
+  filter_settings.id_types = FILTER_ID_NT;
+
+  ED_assetlist_storage_fetch(&library_ref, &C);
+  ED_assetlist_ensure_previews_job(&library_ref, &C);
+  ED_assetlist_iterate(library_ref, [&](AssetHandle asset) {
+    if (!ED_asset_filter_matches_asset(&filter_settings, &asset)) {
+      return true;
+    }
+    if (skip_local && ED_asset_handle_get_local_id(&asset) != nullptr) {
+      return true;
+    }
+    search_link_ops_for_asset_metadata(node_tree, socket, library_ref, asset, search_link_ops);
+    return true;
+  });
+}
+
+static void gather_search_link_ops_for_all_assets(const bContext &C,
+                                                  const bNodeTree &node_tree,
+                                                  const bNodeSocket &socket,
+                                                  Vector<SocketLinkOperation> &search_link_ops)
+{
+  int i;
+  LISTBASE_FOREACH_INDEX (const bUserAssetLibrary *, asset_library, &U.asset_libraries, i) {
+    AssetLibraryReference library_ref{};
+    library_ref.custom_library_index = i;
+    library_ref.type = ASSET_LIBRARY_CUSTOM;
+    /* Skip local assets to avoid duplicates when the asset is part of the local file library. */
+    gather_search_link_ops_for_asset_library(
+        C, node_tree, socket, library_ref, true, search_link_ops);
+  }
+
+  AssetLibraryReference library_ref{};
+  library_ref.custom_library_index = -1;
+  library_ref.type = ASSET_LIBRARY_LOCAL;
+  gather_search_link_ops_for_asset_library(
+      C, node_tree, socket, library_ref, false, search_link_ops);
+}
+
+/**
  * Call the callback to gather compatible socket connections for all node types, and the operations
  * that will actually make the connections. Also add some custom operations like connecting a group
  * output node.
  */
-static void gather_socket_link_operations(bNodeTree &node_tree,
+static void gather_socket_link_operations(const bContext &C,
+                                          bNodeTree &node_tree,
                                           const bNodeSocket &socket,
                                           Vector<SocketLinkOperation> &search_link_ops)
 {
@@ -156,15 +305,20 @@ static void gather_socket_link_operations(bNodeTree &node_tree,
       weight--;
     }
   }
+
+  gather_search_link_ops_for_all_assets(C, node_tree, socket, search_link_ops);
 }
 
-static void link_drag_search_update_fn(const bContext *UNUSED(C),
-                                       void *arg,
-                                       const char *str,
-                                       uiSearchItems *items,
-                                       const bool is_first)
+static void link_drag_search_update_fn(
+    const bContext *C, void *arg, const char *str, uiSearchItems *items, const bool is_first)
 {
   LinkDragSearchStorage &storage = *static_cast<LinkDragSearchStorage *>(arg);
+  if (storage.update_items_tag) {
+    bNodeTree *node_tree = CTX_wm_space_node(C)->edittree;
+    storage.search_link_ops.clear();
+    gather_socket_link_operations(*C, *node_tree, storage.from_socket, storage.search_link_ops);
+    storage.update_items_tag = false;
+  }
 
   StringSearch *search = BLI_string_search_new();
 
@@ -214,7 +368,7 @@ static void link_drag_search_exec_fn(bContext *C, void *arg1, void *arg2)
   bNode *new_node = new_nodes.first();
 
   new_node->locx = storage.cursor.x / UI_DPI_FAC;
-  new_node->locy = storage.cursor.y / UI_DPI_FAC + 20 * UI_DPI_FAC;
+  new_node->locy = storage.cursor.y / UI_DPI_FAC + 20;
   if (storage.in_out() == SOCK_IN) {
     new_node->locx -= new_node->width;
   }
@@ -227,11 +381,10 @@ static void link_drag_search_exec_fn(bContext *C, void *arg1, void *arg2)
   ED_node_tree_propagate_change(C, &bmain, snode.edittree);
 
   /* Start translation operator with the new node. */
-  wmOperatorType *ot = WM_operatortype_find("TRANSFORM_OT_translate", true);
+  wmOperatorType *ot = WM_operatortype_find("NODE_OT_translate_attach_remove_on_cancel", true);
   BLI_assert(ot);
   PointerRNA ptr;
   WM_operator_properties_create_ptr(&ptr, ot);
-  RNA_boolean_set(&ptr, "view2d_edge_pan", true);
   WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, nullptr);
   WM_operator_properties_free(&ptr);
 }
@@ -246,9 +399,6 @@ static uiBlock *create_search_popup_block(bContext *C, ARegion *region, void *ar
 {
   LinkDragSearchStorage &storage = *(LinkDragSearchStorage *)arg_op;
 
-  bNodeTree *node_tree = CTX_wm_space_node(C)->nodetree;
-  gather_socket_link_operations(*node_tree, storage.from_socket, storage.search_link_ops);
-
   uiBlock *block = UI_block_begin(C, region, "_popup", UI_EMBOSS);
   UI_block_flag_enable(block, UI_BLOCK_LOOP | UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_SEARCH_MENU);
   UI_block_theme_style_set(block, UI_BLOCK_THEME_STYLE_POPUP);
@@ -266,6 +416,7 @@ static uiBlock *create_search_popup_block(bContext *C, ARegion *region, void *ar
                               0,
                               "");
   UI_but_func_search_set_sep_string(but, UI_MENU_ARROW_SEP);
+  UI_but_func_search_set_listen(but, link_drag_search_listen_fn);
   UI_but_func_search_set(but,
                          nullptr,
                          link_drag_search_update_fn,
@@ -292,7 +443,7 @@ static uiBlock *create_search_popup_block(bContext *C, ARegion *region, void *ar
            0,
            nullptr);
 
-  const int offset[2] = {0, -UI_UNIT_Y};
+  const int2 offset = {0, -UI_UNIT_Y};
   UI_block_bounds_set_popup(block, 0.3f * U.widget_unit, offset);
   return block;
 }
diff --git a/source/blender/editors/space_node/node_add.cc b/source/blender/editors/space_node/node_add.cc
index 975d4eda7e3..efe53fd6f14 100644
--- a/source/blender/editors/space_node/node_add.cc
+++ b/source/blender/editors/space_node/node_add.cc
@@ -5,6 +5,8 @@
  * \ingroup spnode
  */
 
+#include <numeric>
+
 #include "MEM_guardedalloc.h"
 
 #include "DNA_collection_types.h"
@@ -20,6 +22,7 @@
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
+#include "BKE_node_runtime.hh"
 #include "BKE_node_tree_update.h"
 #include "BKE_report.h"
 #include "BKE_scene.h"
@@ -49,29 +52,48 @@ namespace blender::ed::space_node {
 /** \name Utilities
  * \{ */
 
-bNode *node_add_node(const bContext &C, const char *idname, int type, float locx, float locy)
+static void position_node_based_on_mouse(bNode &node, const float2 &location)
+{
+  node.locx = location.x - NODE_DY * 1.5f / UI_DPI_FAC;
+  node.locy = location.y + NODE_DY * 0.5f / UI_DPI_FAC;
+}
+
+bNode *add_node(const bContext &C, const StringRef idname, const float2 &location)
 {
   SpaceNode &snode = *CTX_wm_space_node(&C);
   Main &bmain = *CTX_data_main(&C);
-  bNode *node = nullptr;
 
   node_deselect_all(snode);
 
-  if (idname) {
-    node = nodeAddNode(&C, snode.edittree, idname);
-  }
-  else {
-    node = nodeAddStaticNode(&C, snode.edittree, type);
-  }
+  const std::string idname_str = idname;
+
+  bNode *node = nodeAddNode(&C, snode.edittree, idname_str.c_str());
   BLI_assert(node && node->typeinfo);
 
-  /* Position mouse in node header. */
-  node->locx = locx - NODE_DY * 1.5f / UI_DPI_FAC;
-  node->locy = locy + NODE_DY * 0.5f / UI_DPI_FAC;
+  position_node_based_on_mouse(*node, location);
 
   nodeSetSelected(node, true);
+  ED_node_set_active(&bmain, &snode, snode.edittree, node, nullptr);
 
+  ED_node_tree_propagate_change(&C, &bmain, snode.edittree);
+  return node;
+}
+
+bNode *add_static_node(const bContext &C, int type, const float2 &location)
+{
+  SpaceNode &snode = *CTX_wm_space_node(&C);
+  Main &bmain = *CTX_data_main(&C);
+
+  node_deselect_all(snode);
+
+  bNode *node = nodeAddStaticNode(&C, snode.edittree, type);
+  BLI_assert(node && node->typeinfo);
+
+  position_node_based_on_mouse(*node, location);
+
+  nodeSetSelected(node, true);
   ED_node_set_active(&bmain, &snode, snode.edittree, node, nullptr);
+
   ED_node_tree_propagate_change(&C, &bmain, snode.edittree);
   return node;
 }
@@ -82,191 +104,113 @@ bNode *node_add_node(const bContext &C, const char *idname, int type, float locx
 /** \name Add Reroute Operator
  * \{ */
 
-static bool add_reroute_intersect_check(const bNodeLink &link,
-                                        float mcoords[][2],
-                                        int tot,
-                                        float result[2])
+std::optional<float2> link_path_intersection(const bNodeLink &link, const Span<float2> path)
 {
-  float coord_array[NODE_LINK_RESOL + 1][2];
-
-  if (node_link_bezier_points(nullptr, nullptr, link, coord_array, NODE_LINK_RESOL)) {
-    for (int i = 0; i < tot - 1; i++) {
-      for (int b = 0; b < NODE_LINK_RESOL; b++) {
-        if (isect_seg_seg_v2_point(
-                mcoords[i], mcoords[i + 1], coord_array[b], coord_array[b + 1], result) > 0) {
-          return true;
-        }
+  std::array<float2, NODE_LINK_RESOL + 1> coords;
+  node_link_bezier_points_evaluated(link, coords);
+
+  for (const int i : path.index_range().drop_back(1)) {
+    for (const int j : IndexRange(NODE_LINK_RESOL)) {
+      float2 result;
+      if (isect_seg_seg_v2_point(path[i], path[i + 1], coords[j], coords[j + 1], result) > 0) {
+        return result;
       }
     }
   }
-  return false;
-}
 
-struct bNodeSocketLink {
-  struct bNodeSocketLink *next, *prev;
+  return std::nullopt;
+}
 
-  struct bNodeSocket *sock;
-  struct bNodeLink *link;
-  float point[2];
+struct RerouteCutsForSocket {
+  /* The output socket's owner node. */
+  bNode *from_node;
+  /* Intersected links connected to the socket and their path intersection locations. */
+  Map<bNodeLink *, float2> links;
 };
 
-static bNodeSocketLink *add_reroute_insert_socket_link(ListBase *lb,
-                                                       bNodeSocket *sock,
-                                                       bNodeLink *link,
-                                                       const float point[2])
+static int add_reroute_exec(bContext *C, wmOperator *op)
 {
-  bNodeSocketLink *socklink, *prev;
-
-  socklink = MEM_cnew<bNodeSocketLink>("socket link");
-  socklink->sock = sock;
-  socklink->link = link;
-  copy_v2_v2(socklink->point, point);
+  const ARegion &region = *CTX_wm_region(C);
+  SpaceNode &snode = *CTX_wm_space_node(C);
+  bNodeTree &ntree = *snode.edittree;
 
-  for (prev = (bNodeSocketLink *)lb->last; prev; prev = prev->prev) {
-    if (prev->sock == sock) {
+  Vector<float2> path;
+  RNA_BEGIN (op->ptr, itemptr, "path") {
+    float2 loc_region;
+    RNA_float_get_array(&itemptr, "loc", loc_region);
+    float2 loc_view;
+    UI_view2d_region_to_view(&region.v2d, loc_region.x, loc_region.y, &loc_view.x, &loc_view.y);
+    path.append(loc_view);
+    if (path.size() >= 256) {
       break;
     }
   }
-  BLI_insertlinkafter(lb, prev, socklink);
-  return socklink;
-}
-
-static bNodeSocketLink *add_reroute_do_socket_section(bContext *C,
-                                                      bNodeSocketLink *socklink,
-                                                      int in_out)
-{
-  SpaceNode *snode = CTX_wm_space_node(C);
-  bNodeTree *ntree = snode->edittree;
-  bNode *reroute_node = nullptr;
-  bNodeSocket *cursock = socklink->sock;
-  float insert_point[2];
-  int num_links;
-
-  zero_v2(insert_point);
-  num_links = 0;
-
-  while (socklink && socklink->sock == cursock) {
-    if (!(socklink->link->flag & NODE_LINK_TEST)) {
-      socklink->link->flag |= NODE_LINK_TEST;
-
-      /* create the reroute node for this cursock */
-      if (!reroute_node) {
-        reroute_node = nodeAddStaticNode(C, ntree, NODE_REROUTE);
-
-        /* add a single link to/from the reroute node to replace multiple links */
-        if (in_out == SOCK_OUT) {
-          nodeAddLink(ntree,
-                      socklink->link->fromnode,
-                      socklink->link->fromsock,
-                      reroute_node,
-                      (bNodeSocket *)reroute_node->inputs.first);
-        }
-        else {
-          nodeAddLink(ntree,
-                      reroute_node,
-                      (bNodeSocket *)reroute_node->outputs.first,
-                      socklink->link->tonode,
-                      socklink->link->tosock);
-        }
-      }
-
-      /* insert the reroute node into the link */
-      if (in_out == SOCK_OUT) {
-        socklink->link->fromnode = reroute_node;
-        socklink->link->fromsock = (bNodeSocket *)reroute_node->outputs.first;
-      }
-      else {
-        socklink->link->tonode = reroute_node;
-        socklink->link->tosock = (bNodeSocket *)reroute_node->inputs.first;
-      }
+  RNA_END;
 
-      add_v2_v2(insert_point, socklink->point);
-      num_links++;
-    }
-    socklink = socklink->next;
+  if (path.is_empty()) {
+    return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
-  if (num_links > 0) {
-    /* average cut point from shared links */
-    mul_v2_fl(insert_point, 1.0f / num_links);
+  ntree.ensure_topology_cache();
+  const Vector<bNode *> frame_nodes = ntree.nodes_by_type("NodeFrame");
 
-    reroute_node->locx = insert_point[0] / UI_DPI_FAC;
-    reroute_node->locy = insert_point[1] / UI_DPI_FAC;
-  }
-
-  return socklink;
-}
-
-static int add_reroute_exec(bContext *C, wmOperator *op)
-{
-  SpaceNode &snode = *CTX_wm_space_node(C);
-  ARegion &region = *CTX_wm_region(C);
-  bNodeTree &ntree = *snode.edittree;
-  float mcoords[256][2];
-  int i = 0;
+  ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
+  node_deselect_all(snode);
 
-  /* Get the cut path */
-  RNA_BEGIN (op->ptr, itemptr, "path") {
-    float loc[2];
+  /* All link "cuts" that start at a particular output socket. Deduplicating new reroutes per
+   * output socket is useful because it allows reusing reroutes for connected intersections.
+   * Further deduplication using the second map means we only have one cut per link. */
+  Map<bNodeSocket *, RerouteCutsForSocket> cuts_per_socket;
 
-    RNA_float_get_array(&itemptr, "loc", loc);
-    UI_view2d_region_to_view(
-        &region.v2d, (short)loc[0], (short)loc[1], &mcoords[i][0], &mcoords[i][1]);
-    i++;
-    if (i >= 256) {
-      break;
+  LISTBASE_FOREACH (bNodeLink *, link, &ntree.links) {
+    if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
+      continue;
     }
+    const std::optional<float2> intersection = link_path_intersection(*link, path);
+    if (!intersection) {
+      continue;
+    }
+    RerouteCutsForSocket &from_cuts = cuts_per_socket.lookup_or_add_default(link->fromsock);
+    from_cuts.from_node = link->fromnode;
+    from_cuts.links.add(link, *intersection);
   }
-  RNA_END;
 
-  if (i > 1) {
-    ListBase output_links, input_links;
-    bNodeSocketLink *socklink;
-    float insert_point[2];
+  for (const auto item : cuts_per_socket.items()) {
+    const Map<bNodeLink *, float2> &cuts = item.value.links;
 
-    /* always first */
-    ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
+    bNode *reroute = nodeAddStaticNode(C, &ntree, NODE_REROUTE);
 
-    node_deselect_all(snode);
+    nodeAddLink(&ntree,
+                item.value.from_node,
+                item.key,
+                reroute,
+                static_cast<bNodeSocket *>(reroute->inputs.first));
 
-    /* Find cut links and sort them by sockets */
-    BLI_listbase_clear(&output_links);
-    BLI_listbase_clear(&input_links);
-
-    LISTBASE_FOREACH (bNodeLink *, link, &ntree.links) {
-      if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
-        continue;
-      }
-      if (add_reroute_intersect_check(*link, mcoords, i, insert_point)) {
-        add_reroute_insert_socket_link(&output_links, link->fromsock, link, insert_point);
-        add_reroute_insert_socket_link(&input_links, link->tosock, link, insert_point);
-
-        /* Clear flag */
-        link->flag &= ~NODE_LINK_TEST;
-      }
+    /* Reconnect links from the original output socket to the new reroute. */
+    for (bNodeLink *link : cuts.keys()) {
+      link->fromnode = reroute;
+      link->fromsock = static_cast<bNodeSocket *>(reroute->outputs.first);
+      BKE_ntree_update_tag_link_changed(&ntree);
     }
 
-    /* Create reroute nodes for intersected links.
-     * Only one reroute if links share the same input/output socket.
-     */
-    socklink = (bNodeSocketLink *)output_links.first;
-    while (socklink) {
-      socklink = add_reroute_do_socket_section(C, socklink, SOCK_OUT);
-    }
-    socklink = (bNodeSocketLink *)input_links.first;
-    while (socklink) {
-      socklink = add_reroute_do_socket_section(C, socklink, SOCK_IN);
+    /* Place the new reroute at the average location of all connected cuts. */
+    const float2 loc = std::accumulate(cuts.values().begin(), cuts.values().end(), float2(0)) /
+                       cuts.size() / UI_DPI_FAC;
+    reroute->locx = loc.x;
+    reroute->locy = loc.y;
+
+    /* Attach the reroute node to frame nodes behind it. */
+    for (const int i : frame_nodes.index_range()) {
+      bNode *frame_node = frame_nodes.last(i);
+      if (BLI_rctf_isect_pt_v(&frame_node->totr, loc)) {
+        nodeAttachNode(reroute, frame_node);
+        break;
+      }
     }
-
-    BLI_freelistN(&output_links);
-    BLI_freelistN(&input_links);
-
-    /* always last */
-    ED_node_tree_propagate_change(C, CTX_data_main(C), &ntree);
-    return OPERATOR_FINISHED;
   }
 
-  return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
+  ED_node_tree_propagate_change(C, CTX_data_main(C), &ntree);
+  return OPERATOR_FINISHED;
 }
 
 void NODE_OT_add_reroute(wmOperatorType *ot)
@@ -338,9 +282,9 @@ static int node_add_group_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   SpaceNode *snode = CTX_wm_space_node(C);
   bNodeTree *ntree = snode->edittree;
-  bNodeTree *node_group;
 
-  if (!(node_group = node_add_group_get_and_poll_group_node_tree(bmain, op, ntree))) {
+  bNodeTree *node_group = node_add_group_get_and_poll_group_node_tree(bmain, op, ntree);
+  if (!node_group) {
     return OPERATOR_CANCELLED;
   }
 
@@ -352,12 +296,7 @@ static int node_add_group_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  bNode *group_node = node_add_node(*C,
-                                    node_idname,
-                                    (node_group->type == NTREE_CUSTOM) ? NODE_CUSTOM_GROUP :
-                                                                         NODE_GROUP,
-                                    snode->runtime->cursor[0],
-                                    snode->runtime->cursor[1]);
+  bNode *group_node = add_node(*C, node_idname, snode->runtime->cursor);
   if (!group_node) {
     BKE_report(op->reports, RPT_WARNING, "Could not add node group");
     return OPERATOR_CANCELLED;
@@ -382,7 +321,7 @@ static bool node_add_group_poll(bContext *C)
   if (snode->edittree->type == NTREE_CUSTOM) {
     CTX_wm_operator_poll_msg_set(C,
                                  "This node editor displays a custom (Python defined) node tree. "
-                                 "Dropping node groups isn't supported for this.");
+                                 "Dropping node groups isn't supported for this");
     return false;
   }
   return true;
@@ -445,8 +384,7 @@ static int node_add_object_exec(bContext *C, wmOperator *op)
 
   ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
 
-  bNode *object_node = node_add_node(
-      *C, nullptr, GEO_NODE_OBJECT_INFO, snode->runtime->cursor[0], snode->runtime->cursor[1]);
+  bNode *object_node = add_static_node(*C, GEO_NODE_OBJECT_INFO, snode->runtime->cursor);
   if (!object_node) {
     BKE_report(op->reports, RPT_WARNING, "Could not add node object");
     return OPERATOR_CANCELLED;
@@ -522,7 +460,7 @@ static int node_add_collection_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
-  bNodeTree *ntree = snode.edittree;
+  bNodeTree &ntree = *snode.edittree;
 
   Collection *collection = reinterpret_cast<Collection *>(
       WM_operator_properties_id_lookup_from_name_or_session_uuid(bmain, op->ptr, ID_GR));
@@ -533,8 +471,7 @@ static int node_add_collection_exec(bContext *C, wmOperator *op)
 
   ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
 
-  bNode *collection_node = node_add_node(
-      *C, nullptr, GEO_NODE_COLLECTION_INFO, snode.runtime->cursor[0], snode.runtime->cursor[1]);
+  bNode *collection_node = add_static_node(*C, GEO_NODE_COLLECTION_INFO, snode.runtime->cursor);
   if (!collection_node) {
     BKE_report(op->reports, RPT_WARNING, "Could not add node collection");
     return OPERATOR_CANCELLED;
@@ -550,8 +487,8 @@ static int node_add_collection_exec(bContext *C, wmOperator *op)
   socket_data->value = collection;
   id_us_plus(&collection->id);
 
-  nodeSetActive(ntree, collection_node);
-  ED_node_tree_propagate_change(C, bmain, ntree);
+  nodeSetActive(&ntree, collection_node);
+  ED_node_tree_propagate_change(C, bmain, &ntree);
   DEG_relations_tag_update(bmain);
 
   return OPERATOR_FINISHED;
@@ -617,11 +554,9 @@ static int node_add_file_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
-  bNode *node;
-  Image *ima;
   int type = 0;
 
-  ima = (Image *)WM_operator_drop_load_path(C, op, ID_IM);
+  Image *ima = (Image *)WM_operator_drop_load_path(C, op, ID_IM);
   if (!ima) {
     return OPERATOR_CANCELLED;
   }
@@ -645,7 +580,7 @@ static int node_add_file_exec(bContext *C, wmOperator *op)
 
   ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
 
-  node = node_add_node(*C, nullptr, type, snode.runtime->cursor[0], snode.runtime->cursor[1]);
+  bNode *node = add_static_node(*C, type, snode.runtime->cursor);
 
   if (!node) {
     BKE_report(op->reports, RPT_WARNING, "Could not add an image node");
@@ -690,8 +625,8 @@ static int node_add_file_invoke(bContext *C, wmOperator *op, const wmEvent *even
   snode->runtime->cursor[0] /= UI_DPI_FAC;
   snode->runtime->cursor[1] /= UI_DPI_FAC;
 
-  if (RNA_struct_property_is_set(op->ptr, "filepath") ||
-      RNA_struct_property_is_set(op->ptr, "name")) {
+  if (WM_operator_properties_id_lookup_is_set(op->ptr) ||
+      RNA_struct_property_is_set(op->ptr, "filepath")) {
     return node_add_file_exec(C, op);
   }
   return WM_operator_filesel(C, op, event);
@@ -739,7 +674,6 @@ static int node_add_mask_exec(bContext *C, wmOperator *op)
 {
   Main *bmain = CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
-  bNode *node;
 
   ID *mask = WM_operator_properties_id_lookup_from_name_or_session_uuid(bmain, op->ptr, ID_MSK);
   if (!mask) {
@@ -748,8 +682,7 @@ static int node_add_mask_exec(bContext *C, wmOperator *op)
 
   ED_preview_kill_jobs(CTX_wm_manager(C), CTX_data_main(C));
 
-  node = node_add_node(
-      *C, nullptr, CMP_NODE_MASK, snode.runtime->cursor[0], snode.runtime->cursor[1]);
+  bNode *node = add_static_node(*C, CMP_NODE_MASK, snode.runtime->cursor);
 
   if (!node) {
     BKE_report(op->reports, RPT_WARNING, "Could not add a mask node");
@@ -877,4 +810,37 @@ void NODE_OT_new_node_tree(wmOperatorType *ot)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Add Node Search
+ * \{ */
+
+static int node_add_search_invoke(bContext *C, wmOperator *op, const wmEvent *event)
+{
+  const ARegion &region = *CTX_wm_region(C);
+
+  float2 cursor;
+  UI_view2d_region_to_view(&region.v2d, event->mval[0], event->mval[1], &cursor.x, &cursor.y);
+
+  invoke_add_node_search_menu(*C, cursor, RNA_boolean_get(op->ptr, "use_transform"));
+
+  return OPERATOR_FINISHED;
+}
+
+void NODE_OT_add_search(wmOperatorType *ot)
+{
+  ot->name = "Search and Add Node";
+  ot->idname = "NODE_OT_add_search";
+  ot->description = "Search for nodes and add one to the active tree";
+
+  ot->invoke = node_add_search_invoke;
+  ot->poll = ED_operator_node_editable;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  RNA_def_boolean(
+      ot->srna, "use_transform", true, "Use Transform", "Start moving the node after adding it");
+}
+
+/** \} */
+
 }  // namespace blender::ed::space_node
diff --git a/source/blender/editors/space_node/node_context_path.cc b/source/blender/editors/space_node/node_context_path.cc
index b9bee3ed15e..4f7497b5f49 100644
--- a/source/blender/editors/space_node/node_context_path.cc
+++ b/source/blender/editors/space_node/node_context_path.cc
@@ -28,27 +28,26 @@
 
 #include "node_intern.hh"
 
-struct Curve;
-struct Light;
 struct Material;
-struct Mesh;
-struct World;
 
 namespace blender::ed::space_node {
 
 static void context_path_add_object_data(Vector<ui::ContextPathItem> &path, Object &object)
 {
-  if (object.type == OB_MESH && object.data) {
-    Mesh *mesh = (Mesh *)object.data;
-    ui::context_path_add_generic(path, RNA_Mesh, mesh);
+  if (!object.data) {
+    return;
   }
-  if (object.type == OB_LAMP && object.data) {
-    Light *light = (Light *)object.data;
-    ui::context_path_add_generic(path, RNA_Light, light);
+  if (object.type == OB_MESH) {
+    ui::context_path_add_generic(path, RNA_Mesh, object.data);
   }
-  if (ELEM(object.type, OB_CURVES_LEGACY, OB_FONT, OB_SURF) && object.data) {
-    Curve *curve = (Curve *)object.data;
-    ui::context_path_add_generic(path, RNA_Curve, curve);
+  else if (object.type == OB_CURVES) {
+    ui::context_path_add_generic(path, RNA_Curves, object.data);
+  }
+  else if (object.type == OB_LAMP) {
+    ui::context_path_add_generic(path, RNA_Light, object.data);
+  }
+  else if (ELEM(object.type, OB_CURVES_LEGACY, OB_FONT, OB_SURF)) {
+    ui::context_path_add_generic(path, RNA_Curve, object.data);
   }
 }
 
@@ -71,8 +70,7 @@ static void get_context_path_node_shader(const bContext &C,
       Scene *scene = CTX_data_scene(&C);
       ui::context_path_add_generic(path, RNA_Scene, scene);
       if (scene != nullptr) {
-        World *world = scene->world;
-        ui::context_path_add_generic(path, RNA_World, world);
+        ui::context_path_add_generic(path, RNA_World, scene->world);
       }
       /* Skip the base node tree here, because the world contains a node tree already. */
       context_path_add_node_tree_and_node_groups(snode, path, true);
@@ -95,8 +93,7 @@ static void get_context_path_node_shader(const bContext &C,
       Scene *scene = CTX_data_scene(&C);
       ui::context_path_add_generic(path, RNA_Scene, scene);
       if (scene != nullptr) {
-        World *world = scene->world;
-        ui::context_path_add_generic(path, RNA_World, world);
+        ui::context_path_add_generic(path, RNA_World, scene->world);
       }
     }
 #ifdef WITH_FREESTYLE
diff --git a/source/blender/editors/space_node/node_draw.cc b/source/blender/editors/space_node/node_draw.cc
index b879219e39c..937db9951b4 100644
--- a/source/blender/editors/space_node/node_draw.cc
+++ b/source/blender/editors/space_node/node_draw.cc
@@ -13,6 +13,7 @@
 #include "DNA_light_types.h"
 #include "DNA_linestyle_types.h"
 #include "DNA_material_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_node_types.h"
 #include "DNA_screen_types.h"
 #include "DNA_space_types.h"
@@ -29,11 +30,14 @@
 
 #include "BLT_translation.h"
 
+#include "BKE_compute_contexts.hh"
 #include "BKE_context.h"
 #include "BKE_idtype.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
+#include "BKE_node_runtime.hh"
+#include "BKE_node_tree_update.h"
 #include "BKE_object.h"
 
 #include "DEG_depsgraph.h"
@@ -64,7 +68,8 @@
 #include "RNA_access.h"
 #include "RNA_prototypes.h"
 
-#include "NOD_geometry_nodes_eval_log.hh"
+#include "NOD_geometry_exec.hh"
+#include "NOD_geometry_nodes_log.hh"
 #include "NOD_node_declaration.hh"
 #include "NOD_socket_declarations_geometry.hh"
 
@@ -73,10 +78,11 @@
 
 #include "node_intern.hh" /* own include */
 
+namespace geo_log = blender::nodes::geo_eval_log;
+
 using blender::GPointer;
+using blender::Vector;
 using blender::fn::GField;
-namespace geo_log = blender::nodes::geometry_nodes_eval_log;
-using geo_log::eNamedAttrUsage;
 
 extern "C" {
 /* XXX interface.h */
@@ -84,6 +90,17 @@ extern void ui_draw_dropshadow(
     const rctf *rct, float radius, float aspect, float alpha, int select);
 }
 
+/**
+ * This is passed to many functions which draw the node editor.
+ */
+struct TreeDrawContext {
+  /**
+   * Geometry nodes logs various data during execution. The logged data that corresponds to the
+   * currently drawn node tree can be retrieved from the log below.
+   */
+  geo_log::GeoTreeLog *geo_tree_log = nullptr;
+};
+
 float ED_node_grid_size()
 {
   return U.widget_unit;
@@ -156,6 +173,12 @@ void ED_node_tag_update_id(ID *id)
 
 namespace blender::ed::space_node {
 
+static void node_socket_add_tooltip_in_node_editor(TreeDrawContext * /*tree_draw_ctx*/,
+                                                   const bNodeTree *ntree,
+                                                   const bNode *node,
+                                                   const bNodeSocket *sock,
+                                                   uiLayout *layout);
+
 static bool compare_nodes(const bNode *a, const bNode *b)
 {
   /* These tell if either the node or any of the parent nodes is selected.
@@ -248,6 +271,7 @@ void node_sort(bNodeTree &ntree)
           b++;
           BLI_remlink(&ntree.nodes, tmp);
           BLI_insertlinkbefore(&ntree.nodes, node_a, tmp);
+          BKE_ntree_update_tag_node_reordered(&ntree);
         }
       }
 
@@ -311,7 +335,11 @@ float2 node_from_view(const bNode &node, const float2 &co)
 /**
  * Based on settings and sockets in node, set drawing rect info.
  */
-static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node, uiBlock &block)
+static void node_update_basis(const bContext &C,
+                              TreeDrawContext &tree_draw_ctx,
+                              bNodeTree &ntree,
+                              bNode &node,
+                              uiBlock &block)
 {
   PointerRNA nodeptr;
   RNA_pointer_create(&ntree.id, &RNA_Node, &node, &nodeptr);
@@ -340,13 +368,13 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
   bool add_output_space = false;
 
   int buty;
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.outputs) {
-    if (nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.outputs) {
+    if (nodeSocketIsHidden(socket)) {
       continue;
     }
 
     PointerRNA sockptr;
-    RNA_pointer_create(&ntree.id, &RNA_NodeSocket, nsock, &sockptr);
+    RNA_pointer_create(&ntree.id, &RNA_NodeSocket, socket, &sockptr);
 
     uiLayout *layout = UI_block_layout(&block,
                                        UI_LAYOUT_VERTICAL,
@@ -369,10 +397,10 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
     /* Align output buttons to the right. */
     uiLayout *row = uiLayoutRow(layout, true);
     uiLayoutSetAlignment(row, UI_LAYOUT_ALIGN_RIGHT);
-    const char *socket_label = nodeSocketLabel(nsock);
-    nsock->typeinfo->draw((bContext *)&C, row, &sockptr, &nodeptr, IFACE_(socket_label));
+    const char *socket_label = nodeSocketLabel(socket);
+    socket->typeinfo->draw((bContext *)&C, row, &sockptr, &nodeptr, IFACE_(socket_label));
 
-    node_socket_add_tooltip(&ntree, &node, nsock, row);
+    node_socket_add_tooltip_in_node_editor(&tree_draw_ctx, &ntree, &node, socket, row);
 
     UI_block_align_end(&block);
     UI_block_layout_resolve(&block, nullptr, &buty);
@@ -381,11 +409,11 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
     buty = min_ii(buty, dy - NODE_DY);
 
     /* Round the socket location to stop it from jiggling. */
-    nsock->locx = round(loc.x + NODE_WIDTH(node));
-    nsock->locy = round(dy - NODE_DYS);
+    socket->locx = round(loc.x + NODE_WIDTH(node));
+    socket->locy = round(dy - NODE_DYS);
 
     dy = buty;
-    if (nsock->next) {
+    if (socket->next) {
       dy -= NODE_SOCKDY;
     }
 
@@ -463,20 +491,20 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
   }
 
   /* Input sockets. */
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.inputs) {
-    if (nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.inputs) {
+    if (nodeSocketIsHidden(socket)) {
       continue;
     }
 
     PointerRNA sockptr;
-    RNA_pointer_create(&ntree.id, &RNA_NodeSocket, nsock, &sockptr);
+    RNA_pointer_create(&ntree.id, &RNA_NodeSocket, socket, &sockptr);
 
     /* Add the half the height of a multi-input socket to cursor Y
      * to account for the increased height of the taller sockets. */
     float multi_input_socket_offset = 0.0f;
-    if (nsock->flag & SOCK_MULTI_INPUT) {
-      if (nsock->total_inputs > 2) {
-        multi_input_socket_offset = (nsock->total_inputs - 2) * NODE_MULTI_INPUT_LINK_GAP;
+    if (socket->flag & SOCK_MULTI_INPUT) {
+      if (socket->total_inputs > 2) {
+        multi_input_socket_offset = (socket->total_inputs - 2) * NODE_MULTI_INPUT_LINK_GAP;
       }
     }
     dy -= multi_input_socket_offset * 0.5f;
@@ -501,10 +529,10 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
 
     uiLayout *row = uiLayoutRow(layout, true);
 
-    const char *socket_label = nodeSocketLabel(nsock);
-    nsock->typeinfo->draw((bContext *)&C, row, &sockptr, &nodeptr, IFACE_(socket_label));
+    const char *socket_label = nodeSocketLabel(socket);
+    socket->typeinfo->draw((bContext *)&C, row, &sockptr, &nodeptr, IFACE_(socket_label));
 
-    node_socket_add_tooltip(&ntree, &node, nsock, row);
+    node_socket_add_tooltip_in_node_editor(&tree_draw_ctx, &ntree, &node, socket, row);
 
     UI_block_align_end(&block);
     UI_block_layout_resolve(&block, nullptr, &buty);
@@ -512,12 +540,12 @@ static void node_update_basis(const bContext &C, bNodeTree &ntree, bNode &node,
     /* Ensure minimum socket height in case layout is empty. */
     buty = min_ii(buty, dy - NODE_DY);
 
-    nsock->locx = loc.x;
+    socket->locx = loc.x;
     /* Round the socket vertical position to stop it from jiggling. */
-    nsock->locy = round(dy - NODE_DYS);
+    socket->locy = round(dy - NODE_DYS);
 
     dy = buty - multi_input_socket_offset * 0.5;
-    if (nsock->next) {
+    if (socket->next) {
       dy -= NODE_SOCKDY;
     }
   }
@@ -555,13 +583,13 @@ static void node_update_hidden(bNode &node, uiBlock &block)
   loc.y = round(loc.y);
 
   /* Calculate minimal radius. */
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.inputs) {
-    if (!nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.inputs) {
+    if (!nodeSocketIsHidden(socket)) {
       totin++;
     }
   }
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.outputs) {
-    if (!nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.outputs) {
+    if (!nodeSocketIsHidden(socket)) {
       totout++;
     }
   }
@@ -581,11 +609,11 @@ static void node_update_hidden(bNode &node, uiBlock &block)
   float rad = (float)M_PI / (1.0f + (float)totout);
   float drad = rad;
 
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.outputs) {
-    if (!nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.outputs) {
+    if (!nodeSocketIsHidden(socket)) {
       /* Round the socket location to stop it from jiggling. */
-      nsock->locx = round(node.totr.xmax - hiddenrad + sinf(rad) * hiddenrad);
-      nsock->locy = round(node.totr.ymin + hiddenrad + cosf(rad) * hiddenrad);
+      socket->locx = round(node.totr.xmax - hiddenrad + sinf(rad) * hiddenrad);
+      socket->locy = round(node.totr.ymin + hiddenrad + cosf(rad) * hiddenrad);
       rad += drad;
     }
   }
@@ -593,11 +621,11 @@ static void node_update_hidden(bNode &node, uiBlock &block)
   /* Input sockets. */
   rad = drad = -(float)M_PI / (1.0f + (float)totin);
 
-  LISTBASE_FOREACH (bNodeSocket *, nsock, &node.inputs) {
-    if (!nodeSocketIsHidden(nsock)) {
+  LISTBASE_FOREACH (bNodeSocket *, socket, &node.inputs) {
+    if (!nodeSocketIsHidden(socket)) {
       /* Round the socket location to stop it from jiggling. */
-      nsock->locx = round(node.totr.xmin + hiddenrad + sinf(rad) * hiddenrad);
-      nsock->locy = round(node.totr.ymin + hiddenrad + cosf(rad) * hiddenrad);
+      socket->locx = round(node.totr.xmin + hiddenrad + sinf(rad) * hiddenrad);
+      socket->locy = round(node.totr.ymin + hiddenrad + cosf(rad) * hiddenrad);
       rad += drad;
     }
   }
@@ -663,7 +691,9 @@ static void node_draw_mute_line(const bContext &C,
   GPU_blend(GPU_BLEND_ALPHA);
 
   LISTBASE_FOREACH (const bNodeLink *, link, &node.internal_links) {
-    node_draw_link_bezier(C, v2d, snode, *link, TH_WIRE_INNER, TH_WIRE_INNER, TH_WIRE, false);
+    if (!nodeLinkIsHidden(link)) {
+      node_draw_link_bezier(C, v2d, snode, *link, TH_WIRE_INNER, TH_WIRE_INNER, TH_WIRE, false);
+    }
   }
 
   GPU_blend(GPU_BLEND_NONE);
@@ -718,8 +748,7 @@ static void node_socket_draw_multi_input(const float color[4],
                                          const float color_outline[4],
                                          const float width,
                                          const float height,
-                                         const int locx,
-                                         const int locy)
+                                         const float2 location)
 {
   /* The other sockets are drawn with the keyframe shader. There, the outline has a base thickness
    * that can be varied but always scales with the size the socket is drawn at. Using `U.dpi_fac`
@@ -729,10 +758,10 @@ static void node_socket_draw_multi_input(const float color[4],
 
   /* UI_draw_roundbox draws the outline on the outer side, so compensate for the outline width. */
   const rctf rect = {
-      locx - width + outline_width * 0.5f,
-      locx + width - outline_width * 0.5f,
-      locy - height + outline_width * 0.5f,
-      locy + height - outline_width * 0.5f,
+      location.x - width + outline_width * 0.5f,
+      location.x + width - outline_width * 0.5f,
+      location.y - height + outline_width * 0.5f,
+      location.y + height - outline_width * 0.5f,
   };
 
   UI_draw_roundbox_corner_set(UI_CNR_ALL);
@@ -756,6 +785,7 @@ static void node_socket_outline_color_get(const bool selected,
   }
   else {
     UI_GetThemeColor4fv(TH_WIRE, r_outline_color);
+    r_outline_color[3] = 1.0f;
   }
 }
 
@@ -773,9 +803,9 @@ void node_socket_color_get(const bContext &C,
 }
 
 struct SocketTooltipData {
-  bNodeTree *ntree;
-  bNode *node;
-  bNodeSocket *socket;
+  const bNodeTree *ntree;
+  const bNode *node;
+  const bNodeSocket *socket;
 };
 
 static void create_inspection_string_for_generic_value(const GPointer value, std::stringstream &ss)
@@ -819,25 +849,16 @@ static void create_inspection_string_for_generic_value(const GPointer value, std
   }
 }
 
-static void create_inspection_string_for_gfield(const geo_log::GFieldValueLog &value_log,
-                                                std::stringstream &ss)
+static void create_inspection_string_for_field_info(const geo_log::FieldInfoLog &value_log,
+                                                    std::stringstream &ss)
 {
-  const CPPType &type = value_log.type();
-  const GField &field = value_log.field();
-  const Span<std::string> input_tooltips = value_log.input_tooltips();
+  const CPPType &type = value_log.type;
+  const Span<std::string> input_tooltips = value_log.input_tooltips;
 
   if (input_tooltips.is_empty()) {
-    if (field) {
-      BUFFER_FOR_CPP_TYPE_VALUE(type, buffer);
-      blender::fn::evaluate_constant_field(field, buffer);
-      create_inspection_string_for_generic_value({type, buffer}, ss);
-      type.destruct(buffer);
-    }
-    else {
-      /* Constant values should always be logged. */
-      BLI_assert_unreachable();
-      ss << "Value has not been logged";
-    }
+    /* Should have been logged as constant value. */
+    BLI_assert_unreachable();
+    ss << "Value has not been logged";
   }
   else {
     if (type.is<int>()) {
@@ -870,11 +891,11 @@ static void create_inspection_string_for_gfield(const geo_log::GFieldValueLog &v
   }
 }
 
-static void create_inspection_string_for_geometry(const geo_log::GeometryValueLog &value_log,
-                                                  std::stringstream &ss,
-                                                  const nodes::decl::Geometry *geometry)
+static void create_inspection_string_for_geometry_info(const geo_log::GeometryInfoLog &value_log,
+                                                       std::stringstream &ss,
+                                                       const nodes::decl::Geometry *socket_decl)
 {
-  Span<GeometryComponentType> component_types = value_log.component_types();
+  Span<GeometryComponentType> component_types = value_log.component_types;
   if (component_types.is_empty()) {
     ss << TIP_("Empty Geometry");
     return;
@@ -891,7 +912,7 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
     const char *line_end = (type == component_types.last()) ? "" : ".\n";
     switch (type) {
       case GEO_COMPONENT_TYPE_MESH: {
-        const geo_log::GeometryValueLog::MeshInfo &mesh_info = *value_log.mesh_info;
+        const geo_log::GeometryInfoLog::MeshInfo &mesh_info = *value_log.mesh_info;
         char line[256];
         BLI_snprintf(line,
                      sizeof(line),
@@ -903,7 +924,7 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
         break;
       }
       case GEO_COMPONENT_TYPE_POINT_CLOUD: {
-        const geo_log::GeometryValueLog::PointCloudInfo &pointcloud_info =
+        const geo_log::GeometryInfoLog::PointCloudInfo &pointcloud_info =
             *value_log.pointcloud_info;
         char line[256];
         BLI_snprintf(line,
@@ -914,7 +935,7 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
         break;
       }
       case GEO_COMPONENT_TYPE_CURVE: {
-        const geo_log::GeometryValueLog::CurveInfo &curve_info = *value_log.curve_info;
+        const geo_log::GeometryInfoLog::CurveInfo &curve_info = *value_log.curve_info;
         char line[256];
         BLI_snprintf(line,
                      sizeof(line),
@@ -924,7 +945,7 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
         break;
       }
       case GEO_COMPONENT_TYPE_INSTANCES: {
-        const geo_log::GeometryValueLog::InstancesInfo &instances_info = *value_log.instances_info;
+        const geo_log::GeometryInfoLog::InstancesInfo &instances_info = *value_log.instances_info;
         char line[256];
         BLI_snprintf(line,
                      sizeof(line),
@@ -937,16 +958,29 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
         ss << TIP_("\u2022 Volume") << line_end;
         break;
       }
+      case GEO_COMPONENT_TYPE_EDIT: {
+        if (value_log.edit_data_info.has_value()) {
+          const geo_log::GeometryInfoLog::EditDataInfo &edit_info = *value_log.edit_data_info;
+          char line[256];
+          BLI_snprintf(line,
+                       sizeof(line),
+                       TIP_("\u2022 Edit Curves: %s, %s"),
+                       edit_info.has_deformed_positions ? TIP_("positions") : TIP_("no positions"),
+                       edit_info.has_deform_matrices ? TIP_("matrices") : TIP_("no matrices"));
+          ss << line << line_end;
+        }
+        break;
+      }
     }
   }
 
   /* If the geometry declaration is null, as is the case for input to group output,
    * or it is an output socket don't show supported types. */
-  if (geometry == nullptr || geometry->in_out() == SOCK_OUT) {
+  if (socket_decl == nullptr || socket_decl->in_out() == SOCK_OUT) {
     return;
   }
 
-  Span<GeometryComponentType> supported_types = geometry->supported_types();
+  Span<GeometryComponentType> supported_types = socket_decl->supported_types();
   if (supported_types.is_empty()) {
     ss << ".\n\n" << TIP_("Supported: All Types");
     return;
@@ -975,69 +1009,74 @@ static void create_inspection_string_for_geometry(const geo_log::GeometryValueLo
         ss << TIP_("Volume");
         break;
       }
+      case GEO_COMPONENT_TYPE_EDIT: {
+        break;
+      }
     }
     ss << ((type == supported_types.last()) ? "" : ", ");
   }
 }
 
-static std::optional<std::string> create_socket_inspection_string(bContext *C,
-                                                                  bNode &node,
-                                                                  bNodeSocket &socket)
+static std::optional<std::string> create_socket_inspection_string(TreeDrawContext &tree_draw_ctx,
+                                                                  const bNodeSocket &socket)
 {
-  SpaceNode *snode = CTX_wm_space_node(C);
-  if (snode == nullptr) {
-    return {};
-  };
-
-  const geo_log::SocketLog *socket_log = geo_log::ModifierLog::find_socket_by_node_editor_context(
-      *snode, node, socket);
-  if (socket_log == nullptr) {
-    return {};
-  }
-  const geo_log::ValueLog *value_log = socket_log->value();
+  using namespace blender::nodes::geo_eval_log;
+  tree_draw_ctx.geo_tree_log->ensure_socket_values();
+  ValueLog *value_log = tree_draw_ctx.geo_tree_log->find_socket_value_log(socket);
   if (value_log == nullptr) {
-    return {};
+    return std::nullopt;
   }
-
   std::stringstream ss;
   if (const geo_log::GenericValueLog *generic_value_log =
           dynamic_cast<const geo_log::GenericValueLog *>(value_log)) {
-    create_inspection_string_for_generic_value(generic_value_log->value(), ss);
+    create_inspection_string_for_generic_value(generic_value_log->value, ss);
   }
-  if (const geo_log::GFieldValueLog *gfield_value_log =
-          dynamic_cast<const geo_log::GFieldValueLog *>(value_log)) {
-    create_inspection_string_for_gfield(*gfield_value_log, ss);
+  else if (const geo_log::FieldInfoLog *gfield_value_log =
+               dynamic_cast<const geo_log::FieldInfoLog *>(value_log)) {
+    create_inspection_string_for_field_info(*gfield_value_log, ss);
   }
-  else if (const geo_log::GeometryValueLog *geo_value_log =
-               dynamic_cast<const geo_log::GeometryValueLog *>(value_log)) {
-    create_inspection_string_for_geometry(
+  else if (const geo_log::GeometryInfoLog *geo_value_log =
+               dynamic_cast<const geo_log::GeometryInfoLog *>(value_log)) {
+    create_inspection_string_for_geometry_info(
         *geo_value_log,
         ss,
         dynamic_cast<const nodes::decl::Geometry *>(socket.runtime->declaration));
   }
 
-  return ss.str();
+  std::string str = ss.str();
+  if (str.empty()) {
+    return std::nullopt;
+  }
+  return str;
 }
 
-static bool node_socket_has_tooltip(bNodeTree *ntree, bNodeSocket *socket)
+static bool node_socket_has_tooltip(const bNodeTree &ntree, const bNodeSocket &socket)
 {
-  if (ntree->type == NTREE_GEOMETRY) {
+  if (ntree.type == NTREE_GEOMETRY) {
     return true;
   }
 
-  if (socket->runtime->declaration != nullptr) {
-    const blender::nodes::SocketDeclaration &socket_decl = *socket->runtime->declaration;
+  if (socket.runtime->declaration != nullptr) {
+    const nodes::SocketDeclaration &socket_decl = *socket.runtime->declaration;
     return !socket_decl.description().is_empty();
   }
 
   return false;
 }
 
-static char *node_socket_get_tooltip(bContext *C,
-                                     bNodeTree *ntree,
-                                     bNode *node,
-                                     bNodeSocket *socket)
+static char *node_socket_get_tooltip(const bContext *C,
+                                     const bNodeTree *ntree,
+                                     const bNode *UNUSED(node),
+                                     const bNodeSocket *socket)
 {
+  SpaceNode *snode = CTX_wm_space_node(C);
+  TreeDrawContext tree_draw_ctx;
+  if (snode != nullptr) {
+    if (ntree->type == NTREE_GEOMETRY) {
+      tree_draw_ctx.geo_tree_log = geo_log::GeoModifierLog::get_tree_log_for_node_editor(*snode);
+    }
+  }
+
   std::stringstream output;
   if (socket->runtime->declaration != nullptr) {
     const blender::nodes::SocketDeclaration &socket_decl = *socket->runtime->declaration;
@@ -1047,13 +1086,13 @@ static char *node_socket_get_tooltip(bContext *C,
     }
   }
 
-  if (ntree->type == NTREE_GEOMETRY) {
+  if (ntree->type == NTREE_GEOMETRY && tree_draw_ctx.geo_tree_log != nullptr) {
     if (!output.str().empty()) {
       output << ".\n\n";
     }
 
     std::optional<std::string> socket_inspection_str = create_socket_inspection_string(
-        C, *node, *socket);
+        tree_draw_ctx, *socket);
     if (socket_inspection_str.has_value()) {
       output << *socket_inspection_str;
     }
@@ -1069,9 +1108,13 @@ static char *node_socket_get_tooltip(bContext *C,
   return BLI_strdup(output.str().c_str());
 }
 
-void node_socket_add_tooltip(bNodeTree *ntree, bNode *node, bNodeSocket *sock, uiLayout *layout)
+static void node_socket_add_tooltip_in_node_editor(TreeDrawContext *UNUSED(tree_draw_ctx),
+                                                   const bNodeTree *ntree,
+                                                   const bNode *node,
+                                                   const bNodeSocket *sock,
+                                                   uiLayout *layout)
 {
-  if (!node_socket_has_tooltip(ntree, sock)) {
+  if (!node_socket_has_tooltip(*ntree, *sock)) {
     return;
   }
 
@@ -1091,6 +1134,14 @@ void node_socket_add_tooltip(bNodeTree *ntree, bNode *node, bNodeSocket *sock, u
       MEM_freeN);
 }
 
+void node_socket_add_tooltip(const bNodeTree &ntree,
+                             const bNode &node,
+                             const bNodeSocket &sock,
+                             uiLayout &layout)
+{
+  node_socket_add_tooltip_in_node_editor(nullptr, &ntree, &node, &sock, &layout);
+}
+
 static void node_socket_draw_nested(const bContext &C,
                                     bNodeTree &ntree,
                                     PointerRNA &node_ptr,
@@ -1104,9 +1155,10 @@ static void node_socket_draw_nested(const bContext &C,
                                     const float size,
                                     const bool selected)
 {
+  const float2 location(sock.locx, sock.locy);
+
   float color[4];
   float outline_color[4];
-
   node_socket_color_get(C, ntree, node_ptr, sock, color);
   node_socket_outline_color_get(selected, sock.type, outline_color);
 
@@ -1114,15 +1166,15 @@ static void node_socket_draw_nested(const bContext &C,
                    color,
                    outline_color,
                    size,
-                   sock.locx,
-                   sock.locy,
+                   location.x,
+                   location.y,
                    pos_id,
                    col_id,
                    shape_id,
                    size_id,
                    outline_col_id);
 
-  if (!node_socket_has_tooltip(&ntree, &sock)) {
+  if (!node_socket_has_tooltip(ntree, sock)) {
     return;
   }
 
@@ -1134,8 +1186,8 @@ static void node_socket_draw_nested(const bContext &C,
                             UI_BTYPE_BUT,
                             0,
                             ICON_NONE,
-                            sock.locx - size / 2,
-                            sock.locy - size / 2,
+                            location.x - size / 2.0f,
+                            location.y - size / 2.0f,
                             size,
                             size,
                             nullptr,
@@ -1145,9 +1197,9 @@ static void node_socket_draw_nested(const bContext &C,
                             0,
                             nullptr);
 
-  SocketTooltipData *data = (SocketTooltipData *)MEM_mallocN(sizeof(SocketTooltipData), __func__);
+  SocketTooltipData *data = MEM_new<SocketTooltipData>(__func__);
   data->ntree = &ntree;
-  data->node = (bNode *)node_ptr.data;
+  data->node = static_cast<const bNode *>(node_ptr.data);
   data->socket = &sock;
 
   UI_but_func_tooltip_set(
@@ -1266,7 +1318,7 @@ static void node_draw_preview(bNodePreview *preview, rctf *prv)
   /* Premul graphics. */
   GPU_blend(GPU_BLEND_ALPHA);
 
-  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_2D_IMAGE_COLOR);
+  IMMDrawPixelsTexState state = immDrawPixelsTexSetup(GPU_SHADER_3D_IMAGE_COLOR);
   immDrawPixelsTexTiled(&state,
                         draw_rect.xmin,
                         draw_rect.ymin,
@@ -1282,14 +1334,14 @@ static void node_draw_preview(bNodePreview *preview, rctf *prv)
   GPU_blend(GPU_BLEND_NONE);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColorShadeAlpha(TH_BACK, -15, +100);
   imm_draw_box_wire_2d(pos, draw_rect.xmin, draw_rect.ymin, draw_rect.xmax, draw_rect.ymax);
   immUnbindProgram();
 }
 
 /* Common handle function for operator buttons that need to select the node first. */
-static void node_toggle_button_cb(struct bContext *C, void *node_argv, void *op_argv)
+static void node_toggle_button_cb(bContext *C, void *node_argv, void *op_argv)
 {
   bNode *node = (bNode *)node_argv;
   const char *opname = (const char *)op_argv;
@@ -1508,7 +1560,8 @@ static void node_draw_sockets(const View2D &v2d,
     node_socket_color_get(C, ntree, node_ptr, *socket, color);
     node_socket_outline_color_get(socket->flag & SELECT, socket->type, outline_color);
 
-    node_socket_draw_multi_input(color, outline_color, width, height, socket->locx, socket->locy);
+    const float2 location(socket->locx, socket->locy);
+    node_socket_draw_multi_input(color, outline_color, width, height, location);
   }
 }
 
@@ -1582,27 +1635,26 @@ static char *node_errors_tooltip_fn(bContext *UNUSED(C), void *argN, const char
 
 #define NODE_HEADER_ICON_SIZE (0.8f * U.widget_unit)
 
-static void node_add_error_message_button(
-    const bContext &C, bNode &node, uiBlock &block, const rctf &rect, float &icon_offset)
+static void node_add_error_message_button(TreeDrawContext &tree_draw_ctx,
+                                          bNode &node,
+                                          uiBlock &block,
+                                          const rctf &rect,
+                                          float &icon_offset)
 {
-  SpaceNode *snode = CTX_wm_space_node(&C);
-  const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_node_editor_context(*snode,
-                                                                                            node);
-  if (node_log == nullptr) {
-    return;
+  Span<geo_log::NodeWarning> warnings;
+  if (tree_draw_ctx.geo_tree_log) {
+    geo_log::GeoNodeLog *node_log = tree_draw_ctx.geo_tree_log->nodes.lookup_ptr(node.name);
+    if (node_log != nullptr) {
+      warnings = node_log->warnings;
+    }
   }
-
-  Span<geo_log::NodeWarning> warnings = node_log->warnings();
-
   if (warnings.is_empty()) {
     return;
   }
 
-  NodeErrorsTooltipData *tooltip_data = (NodeErrorsTooltipData *)MEM_mallocN(
-      sizeof(NodeErrorsTooltipData), __func__);
-  tooltip_data->warnings = warnings;
-
   const geo_log::NodeWarningType display_type = node_error_highest_priority(warnings);
+  NodeErrorsTooltipData *tooltip_data = MEM_new<NodeErrorsTooltipData>(__func__);
+  tooltip_data->warnings = warnings;
 
   icon_offset -= NODE_HEADER_ICON_SIZE;
   UI_block_emboss_set(&block, UI_EMBOSS_NONE);
@@ -1620,90 +1672,70 @@ static void node_add_error_message_button(
                             0,
                             0,
                             nullptr);
-  UI_but_func_tooltip_set(but, node_errors_tooltip_fn, tooltip_data, MEM_freeN);
+  UI_but_func_tooltip_set(but, node_errors_tooltip_fn, tooltip_data, [](void *arg) {
+    MEM_delete(static_cast<NodeErrorsTooltipData *>(arg));
+  });
   UI_block_emboss_set(&block, UI_EMBOSS);
 }
 
-static void get_exec_time_other_nodes(const bNode &node,
-                                      const SpaceNode &snode,
-                                      std::chrono::microseconds &exec_time,
-                                      int &node_count)
+static std::optional<std::chrono::nanoseconds> node_get_execution_time(
+    TreeDrawContext &tree_draw_ctx, const bNodeTree &ntree, const bNode &node)
 {
-  if (node.type == NODE_GROUP) {
-    const geo_log::TreeLog *root_tree_log = geo_log::ModifierLog::find_tree_by_node_editor_context(
-        snode);
-    if (root_tree_log == nullptr) {
-      return;
-    }
-    const geo_log::TreeLog *tree_log = root_tree_log->lookup_child_log(node.name);
-    if (tree_log == nullptr) {
-      return;
-    }
-    tree_log->foreach_node_log([&](const geo_log::NodeLog &node_log) {
-      exec_time += node_log.execution_time();
-      node_count++;
-    });
+  const geo_log::GeoTreeLog *tree_log = tree_draw_ctx.geo_tree_log;
+  if (tree_log == nullptr) {
+    return std::nullopt;
   }
-  else {
-    const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_node_editor_context(
-        snode, node);
-    if (node_log) {
-      exec_time += node_log->execution_time();
-      node_count++;
-    }
-  }
-}
-
-static std::chrono::microseconds node_get_execution_time(const bNodeTree &ntree,
-                                                         const bNode &node,
-                                                         const SpaceNode &snode,
-                                                         int &node_count)
-{
-  std::chrono::microseconds exec_time = std::chrono::microseconds::zero();
   if (node.type == NODE_GROUP_OUTPUT) {
-    const geo_log::TreeLog *tree_log = geo_log::ModifierLog::find_tree_by_node_editor_context(
-        snode);
-
-    if (tree_log == nullptr) {
-      return exec_time;
-    }
-    tree_log->foreach_node_log([&](const geo_log::NodeLog &node_log) {
-      exec_time += node_log.execution_time();
-      node_count++;
-    });
+    return tree_log->run_time_sum;
   }
-  else if (node.type == NODE_FRAME) {
+  if (node.type == NODE_FRAME) {
     /* Could be cached in the future if this recursive code turns out to be slow. */
+    std::chrono::nanoseconds run_time{0};
+    bool found_node = false;
     LISTBASE_FOREACH (bNode *, tnode, &ntree.nodes) {
       if (tnode->parent != &node) {
         continue;
       }
 
       if (tnode->type == NODE_FRAME) {
-        exec_time += node_get_execution_time(ntree, *tnode, snode, node_count);
+        std::optional<std::chrono::nanoseconds> sub_frame_run_time = node_get_execution_time(
+            tree_draw_ctx, ntree, *tnode);
+        if (sub_frame_run_time.has_value()) {
+          run_time += *sub_frame_run_time;
+          found_node = true;
+        }
       }
       else {
-        get_exec_time_other_nodes(*tnode, snode, exec_time, node_count);
+        if (const geo_log::GeoNodeLog *node_log = tree_log->nodes.lookup_ptr_as(tnode->name)) {
+          found_node = true;
+          run_time += node_log->run_time;
+        }
       }
     }
+    if (found_node) {
+      return run_time;
+    }
+    return std::nullopt;
   }
-  else {
-    get_exec_time_other_nodes(node, snode, exec_time, node_count);
+  if (const geo_log::GeoNodeLog *node_log = tree_log->nodes.lookup_ptr(node.name)) {
+    return node_log->run_time;
   }
-  return exec_time;
+  return std::nullopt;
 }
 
-static std::string node_get_execution_time_label(const SpaceNode &snode, const bNode &node)
+static std::string node_get_execution_time_label(TreeDrawContext &tree_draw_ctx,
+                                                 const SpaceNode &snode,
+                                                 const bNode &node)
 {
-  int node_count = 0;
-  std::chrono::microseconds exec_time = node_get_execution_time(
-      *snode.nodetree, node, snode, node_count);
+  const std::optional<std::chrono::nanoseconds> exec_time = node_get_execution_time(
+      tree_draw_ctx, *snode.edittree, node);
 
-  if (node_count == 0) {
+  if (!exec_time.has_value()) {
     return std::string("");
   }
 
-  uint64_t exec_time_us = exec_time.count();
+  const uint64_t exec_time_us =
+      std::chrono::duration_cast<std::chrono::microseconds>(*exec_time).count();
 
   /* Don't show time if execution time is 0 microseconds. */
   if (exec_time_us == 0) {
@@ -1738,7 +1770,7 @@ struct NodeExtraInfoRow {
 };
 
 struct NamedAttributeTooltipArg {
-  Map<std::string, eNamedAttrUsage> usage_by_attribute;
+  Map<StringRefNull, geo_log::NamedAttributeUsage> usage_by_attribute;
 };
 
 static char *named_attribute_tooltip(bContext *UNUSED(C), void *argN, const char *UNUSED(tip))
@@ -1750,7 +1782,7 @@ static char *named_attribute_tooltip(bContext *UNUSED(C), void *argN, const char
 
   struct NameWithUsage {
     StringRefNull name;
-    eNamedAttrUsage usage;
+    geo_log::NamedAttributeUsage usage;
   };
 
   Vector<NameWithUsage> sorted_used_attribute;
@@ -1765,16 +1797,16 @@ static char *named_attribute_tooltip(bContext *UNUSED(C), void *argN, const char
 
   for (const NameWithUsage &attribute : sorted_used_attribute) {
     const StringRefNull name = attribute.name;
-    const eNamedAttrUsage usage = attribute.usage;
+    const geo_log::NamedAttributeUsage usage = attribute.usage;
     ss << "  \u2022 \"" << name << "\": ";
     Vector<std::string> usages;
-    if ((usage & eNamedAttrUsage::Read) != eNamedAttrUsage::None) {
+    if ((usage & geo_log::NamedAttributeUsage::Read) != geo_log::NamedAttributeUsage::None) {
       usages.append(TIP_("read"));
     }
-    if ((usage & eNamedAttrUsage::Write) != eNamedAttrUsage::None) {
+    if ((usage & geo_log::NamedAttributeUsage::Write) != geo_log::NamedAttributeUsage::None) {
       usages.append(TIP_("write"));
     }
-    if ((usage & eNamedAttrUsage::Remove) != eNamedAttrUsage::None) {
+    if ((usage & geo_log::NamedAttributeUsage::Remove) != geo_log::NamedAttributeUsage::None) {
       usages.append(TIP_("remove"));
     }
     for (const int i : usages.index_range()) {
@@ -1792,7 +1824,7 @@ static char *named_attribute_tooltip(bContext *UNUSED(C), void *argN, const char
 }
 
 static NodeExtraInfoRow row_from_used_named_attribute(
-    const Map<std::string, eNamedAttrUsage> &usage_by_attribute_name)
+    const Map<StringRefNull, geo_log::NamedAttributeUsage> &usage_by_attribute_name)
 {
   const int attributes_num = usage_by_attribute_name.size();
 
@@ -1806,32 +1838,11 @@ static NodeExtraInfoRow row_from_used_named_attribute(
   return row;
 }
 
-static std::optional<NodeExtraInfoRow> node_get_accessed_attributes_row(const SpaceNode &snode,
-                                                                        const bNode &node)
+static std::optional<NodeExtraInfoRow> node_get_accessed_attributes_row(
+    TreeDrawContext &tree_draw_ctx, const bNode &node)
 {
-  if (node.type == NODE_GROUP) {
-    const geo_log::TreeLog *root_tree_log = geo_log::ModifierLog::find_tree_by_node_editor_context(
-        snode);
-    if (root_tree_log == nullptr) {
-      return std::nullopt;
-    }
-    const geo_log::TreeLog *tree_log = root_tree_log->lookup_child_log(node.name);
-    if (tree_log == nullptr) {
-      return std::nullopt;
-    }
-
-    Map<std::string, eNamedAttrUsage> usage_by_attribute;
-    tree_log->foreach_node_log([&](const geo_log::NodeLog &node_log) {
-      for (const geo_log::UsedNamedAttribute &used_attribute : node_log.used_named_attributes()) {
-        usage_by_attribute.lookup_or_add_as(used_attribute.name,
-                                            used_attribute.usage) |= used_attribute.usage;
-      }
-    });
-    if (usage_by_attribute.is_empty()) {
-      return std::nullopt;
-    }
-
-    return row_from_used_named_attribute(usage_by_attribute);
+  if (tree_draw_ctx.geo_tree_log == nullptr) {
+    return std::nullopt;
   }
   if (ELEM(node.type,
            GEO_NODE_STORE_NAMED_ATTRIBUTE,
@@ -1840,31 +1851,26 @@ static std::optional<NodeExtraInfoRow> node_get_accessed_attributes_row(const Sp
     /* Only show the overlay when the name is passed in from somewhere else. */
     LISTBASE_FOREACH (bNodeSocket *, socket, &node.inputs) {
       if (STREQ(socket->name, "Name")) {
-        if ((socket->flag & SOCK_IN_USE) == 0) {
+        if (!socket->is_directly_linked()) {
           return std::nullopt;
         }
       }
     }
-    const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_node_editor_context(
-        snode, node.name);
-    if (node_log == nullptr) {
-      return std::nullopt;
-    }
-    Map<std::string, eNamedAttrUsage> usage_by_attribute;
-    for (const geo_log::UsedNamedAttribute &used_attribute : node_log->used_named_attributes()) {
-      usage_by_attribute.lookup_or_add_as(used_attribute.name,
-                                          used_attribute.usage) |= used_attribute.usage;
-    }
-    if (usage_by_attribute.is_empty()) {
-      return std::nullopt;
-    }
-    return row_from_used_named_attribute(usage_by_attribute);
   }
-
-  return std::nullopt;
+  tree_draw_ctx.geo_tree_log->ensure_used_named_attributes();
+  geo_log::GeoNodeLog *node_log = tree_draw_ctx.geo_tree_log->nodes.lookup_ptr(node.name);
+  if (node_log == nullptr) {
+    return std::nullopt;
+  }
+  if (node_log->used_named_attributes.is_empty()) {
+    return std::nullopt;
+  }
+  return row_from_used_named_attribute(node_log->used_named_attributes);
 }
 
-static Vector<NodeExtraInfoRow> node_get_extra_info(const SpaceNode &snode, const bNode &node)
+static Vector<NodeExtraInfoRow> node_get_extra_info(TreeDrawContext &tree_draw_ctx,
+                                                    const SpaceNode &snode,
+                                                    const bNode &node)
 {
   Vector<NodeExtraInfoRow> rows;
   if (!(snode.overlay.flag & SN_OVERLAY_SHOW_OVERLAYS)) {
@@ -1873,7 +1879,8 @@ static Vector<NodeExtraInfoRow> node_get_extra_info(const SpaceNode &snode, cons
 
   if (snode.overlay.flag & SN_OVERLAY_SHOW_NAMED_ATTRIBUTES &&
       snode.edittree->type == NTREE_GEOMETRY) {
-    if (std::optional<NodeExtraInfoRow> row = node_get_accessed_attributes_row(snode, node)) {
+    if (std::optional<NodeExtraInfoRow> row = node_get_accessed_attributes_row(tree_draw_ctx,
+                                                                               node)) {
       rows.append(std::move(*row));
     }
   }
@@ -1882,7 +1889,7 @@ static Vector<NodeExtraInfoRow> node_get_extra_info(const SpaceNode &snode, cons
       (ELEM(node.typeinfo->nclass, NODE_CLASS_GEOMETRY, NODE_CLASS_GROUP, NODE_CLASS_ATTRIBUTE) ||
        ELEM(node.type, NODE_FRAME, NODE_GROUP_OUTPUT))) {
     NodeExtraInfoRow row;
-    row.text = node_get_execution_time_label(snode, node);
+    row.text = node_get_execution_time_label(tree_draw_ctx, snode, node);
     if (!row.text.empty()) {
       row.tooltip = TIP_(
           "The execution time from the node tree's latest evaluation. For frame and group nodes, "
@@ -1891,14 +1898,17 @@ static Vector<NodeExtraInfoRow> node_get_extra_info(const SpaceNode &snode, cons
       rows.append(std::move(row));
     }
   }
-  const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_node_editor_context(snode,
-                                                                                            node);
-  if (node_log != nullptr) {
-    for (const std::string &message : node_log->debug_messages()) {
-      NodeExtraInfoRow row;
-      row.text = message;
-      row.icon = ICON_INFO;
-      rows.append(std::move(row));
+
+  if (snode.edittree->type == NTREE_GEOMETRY && tree_draw_ctx.geo_tree_log != nullptr) {
+    tree_draw_ctx.geo_tree_log->ensure_debug_messages();
+    const geo_log::GeoNodeLog *node_log = tree_draw_ctx.geo_tree_log->nodes.lookup_ptr(node.name);
+    if (node_log != nullptr) {
+      for (const StringRef message : node_log->debug_messages) {
+        NodeExtraInfoRow row;
+        row.text = message;
+        row.icon = ICON_INFO;
+        rows.append(std::move(row));
+      }
     }
   }
 
@@ -1963,9 +1973,12 @@ static void node_draw_extra_info_row(const bNode &node,
   }
 }
 
-static void node_draw_extra_info_panel(const SpaceNode &snode, const bNode &node, uiBlock &block)
+static void node_draw_extra_info_panel(TreeDrawContext &tree_draw_ctx,
+                                       const SpaceNode &snode,
+                                       const bNode &node,
+                                       uiBlock &block)
 {
-  Vector<NodeExtraInfoRow> extra_info_rows = node_get_extra_info(snode, node);
+  Vector<NodeExtraInfoRow> extra_info_rows = node_get_extra_info(tree_draw_ctx, snode, node);
 
   if (extra_info_rows.size() == 0) {
     return;
@@ -2021,6 +2034,7 @@ static void node_draw_extra_info_panel(const SpaceNode &snode, const bNode &node
 }
 
 static void node_draw_basis(const bContext &C,
+                            TreeDrawContext &tree_draw_ctx,
                             const View2D &v2d,
                             const SpaceNode &snode,
                             bNodeTree &ntree,
@@ -2045,7 +2059,7 @@ static void node_draw_basis(const bContext &C,
 
   GPU_line_width(1.0f);
 
-  node_draw_extra_info_panel(snode, node, block);
+  node_draw_extra_info_panel(tree_draw_ctx, snode, node, block);
 
   /* Header. */
   {
@@ -2140,7 +2154,7 @@ static void node_draw_basis(const bContext &C,
     UI_block_emboss_set(&block, UI_EMBOSS);
   }
 
-  node_add_error_message_button(C, node, block, rct, iconofs);
+  node_add_error_message_button(tree_draw_ctx, node, block, rct, iconofs);
 
   /* Title. */
   if (node.flag & SELECT) {
@@ -2245,6 +2259,7 @@ static void node_draw_basis(const bContext &C,
 
     if (node.flag & NODE_MUTED) {
       UI_GetThemeColor4fv(TH_WIRE, color_underline);
+      color_underline[3] = 1.0f;
     }
     else {
       UI_GetThemeColorBlend4f(TH_BACK, color_id, 0.2f, color_underline);
@@ -2312,6 +2327,7 @@ static void node_draw_basis(const bContext &C,
 }
 
 static void node_draw_hidden(const bContext &C,
+                             TreeDrawContext &tree_draw_ctx,
                              const View2D &v2d,
                              const SpaceNode &snode,
                              bNodeTree &ntree,
@@ -2327,7 +2343,7 @@ static void node_draw_hidden(const bContext &C,
 
   const int color_id = node_get_colorid(node);
 
-  node_draw_extra_info_panel(snode, node, block);
+  node_draw_extra_info_panel(tree_draw_ctx, snode, node, block);
 
   /* Shadow. */
   node_draw_shadow(snode, node, hiddenrad, 1.0f);
@@ -2452,7 +2468,7 @@ static void node_draw_hidden(const bContext &C,
   /* Scale widget thing. */
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   GPU_blend(GPU_BLEND_ALPHA);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColorShadeAlpha(TH_TEXT, -40, -180);
   float dx = 0.5f * U.widget_unit;
@@ -2625,13 +2641,13 @@ static void reroute_node_prepare_for_draw(bNode &node)
   const float2 loc = node_to_view(node, float2(0));
 
   /* reroute node has exactly one input and one output, both in the same place */
-  bNodeSocket *nsock = (bNodeSocket *)node.outputs.first;
-  nsock->locx = loc.x;
-  nsock->locy = loc.y;
+  bNodeSocket *socket = (bNodeSocket *)node.outputs.first;
+  socket->locx = loc.x;
+  socket->locy = loc.y;
 
-  nsock = (bNodeSocket *)node.inputs.first;
-  nsock->locx = loc.x;
-  nsock->locy = loc.y;
+  socket = (bNodeSocket *)node.inputs.first;
+  socket->locx = loc.x;
+  socket->locy = loc.y;
 
   const float size = 8.0f;
   node.width = size * 2;
@@ -2642,6 +2658,7 @@ static void reroute_node_prepare_for_draw(bNode &node)
 }
 
 static void node_update_nodetree(const bContext &C,
+                                 TreeDrawContext &tree_draw_ctx,
                                  bNodeTree &ntree,
                                  Span<bNode *> nodes,
                                  Span<uiBlock *> blocks)
@@ -2668,7 +2685,7 @@ static void node_update_nodetree(const bContext &C,
         node_update_hidden(node, block);
       }
       else {
-        node_update_basis(C, ntree, node, block);
+        node_update_basis(C, tree_draw_ctx, ntree, node, block);
       }
     }
   }
@@ -2748,7 +2765,7 @@ static void frame_node_draw_label(const bNodeTree &ntree,
     BLF_wordwrap(fontid, line_width);
 
     LISTBASE_FOREACH (const TextLine *, line, &text->lines) {
-      struct ResultBLF info;
+      ResultBLF info;
       if (line->line[0]) {
         BLF_position(fontid, x, y, 0);
         BLF_draw_ex(fontid, line->line, line->len, &info);
@@ -2769,6 +2786,7 @@ static void frame_node_draw_label(const bNodeTree &ntree,
 }
 
 static void frame_node_draw(const bContext &C,
+                            TreeDrawContext &tree_draw_ctx,
                             const ARegion &region,
                             const SpaceNode &snode,
                             bNodeTree &ntree,
@@ -2815,7 +2833,7 @@ static void frame_node_draw(const bContext &C,
   /* label and text */
   frame_node_draw_label(ntree, node, snode);
 
-  node_draw_extra_info_panel(snode, node, block);
+  node_draw_extra_info_panel(tree_draw_ctx, snode, node, block);
 
   UI_block_end(&C, &block);
   UI_block_draw(&C, &block);
@@ -2869,6 +2887,7 @@ static void reroute_node_draw(
 }
 
 static void node_draw(const bContext &C,
+                      TreeDrawContext &tree_draw_ctx,
                       ARegion &region,
                       const SpaceNode &snode,
                       bNodeTree &ntree,
@@ -2877,7 +2896,7 @@ static void node_draw(const bContext &C,
                       bNodeInstanceKey key)
 {
   if (node.type == NODE_FRAME) {
-    frame_node_draw(C, region, snode, ntree, node, block);
+    frame_node_draw(C, tree_draw_ctx, region, snode, ntree, node, block);
   }
   else if (node.type == NODE_REROUTE) {
     reroute_node_draw(C, region, ntree, node, block);
@@ -2885,10 +2904,10 @@ static void node_draw(const bContext &C,
   else {
     const View2D &v2d = region.v2d;
     if (node.flag & NODE_HIDDEN) {
-      node_draw_hidden(C, v2d, snode, ntree, node, block);
+      node_draw_hidden(C, tree_draw_ctx, v2d, snode, ntree, node, block);
     }
     else {
-      node_draw_basis(C, v2d, snode, ntree, node, block, key);
+      node_draw_basis(C, tree_draw_ctx, v2d, snode, ntree, node, block, key);
     }
   }
 }
@@ -2896,6 +2915,7 @@ static void node_draw(const bContext &C,
 #define USE_DRAW_TOT_UPDATE
 
 static void node_draw_nodetree(const bContext &C,
+                               TreeDrawContext &tree_draw_ctx,
                                ARegion &region,
                                SpaceNode &snode,
                                bNodeTree &ntree,
@@ -2920,7 +2940,7 @@ static void node_draw_nodetree(const bContext &C,
     }
 
     bNodeInstanceKey key = BKE_node_instance_key(parent_key, &ntree, nodes[i]);
-    node_draw(C, region, snode, ntree, *nodes[i], *blocks[i], key);
+    node_draw(C, tree_draw_ctx, region, snode, ntree, *nodes[i], *blocks[i], key);
   }
 
   /* Node lines. */
@@ -2950,7 +2970,7 @@ static void node_draw_nodetree(const bContext &C,
     }
 
     bNodeInstanceKey key = BKE_node_instance_key(parent_key, &ntree, nodes[i]);
-    node_draw(C, region, snode, ntree, *nodes[i], *blocks[i], key);
+    node_draw(C, tree_draw_ctx, region, snode, ntree, *nodes[i], *blocks[i], key);
   }
 }
 
@@ -3003,13 +3023,23 @@ static void draw_nodetree(const bContext &C,
                           bNodeInstanceKey parent_key)
 {
   SpaceNode *snode = CTX_wm_space_node(&C);
+  ntree.ensure_topology_cache();
 
-  Vector<bNode *> nodes = ntree.nodes;
+  Span<bNode *> nodes = ntree.all_nodes();
 
   Array<uiBlock *> blocks = node_uiblocks_init(C, nodes);
 
-  node_update_nodetree(C, ntree, nodes, blocks);
-  node_draw_nodetree(C, region, *snode, ntree, nodes, blocks, parent_key);
+  TreeDrawContext tree_draw_ctx;
+  if (ntree.type == NTREE_GEOMETRY) {
+    tree_draw_ctx.geo_tree_log = geo_log::GeoModifierLog::get_tree_log_for_node_editor(*snode);
+    if (tree_draw_ctx.geo_tree_log != nullptr) {
+      tree_draw_ctx.geo_tree_log->ensure_node_warnings();
+      tree_draw_ctx.geo_tree_log->ensure_node_run_time();
+    }
+  }
+
+  node_update_nodetree(C, tree_draw_ctx, ntree, nodes, blocks);
+  node_draw_nodetree(C, tree_draw_ctx, region, *snode, ntree, nodes, blocks, parent_key);
 }
 
 /**
@@ -3084,8 +3114,8 @@ void node_draw_space(const bContext &C, ARegion &region)
     }
 
     /* Current View2D center, will be set temporarily for parent node trees. */
-    float center[2];
-    UI_view2d_center_get(&v2d, &center[0], &center[1]);
+    float2 center;
+    UI_view2d_center_get(&v2d, &center.x, &center.y);
 
     /* Store new view center in path and current edit tree. */
     copy_v2_v2(path->view_center, center);
@@ -3124,7 +3154,7 @@ void node_draw_space(const bContext &C, ARegion &region)
     GPU_line_smooth(true);
     if (snode.runtime->linkdrag) {
       for (const bNodeLink *link : snode.runtime->linkdrag->links) {
-        node_draw_link(C, v2d, snode, *link, true);
+        node_draw_link_dragged(C, v2d, snode, *link);
       }
     }
     GPU_line_smooth(false);
diff --git a/source/blender/editors/space_node/node_edit.cc b/source/blender/editors/space_node/node_edit.cc
index ffc9befc81c..31d99eafbc1 100644
--- a/source/blender/editors/space_node/node_edit.cc
+++ b/source/blender/editors/space_node/node_edit.cc
@@ -29,6 +29,8 @@
 #include "BKE_scene.h"
 #include "BKE_workspace.h"
 
+#include "BLT_translation.h"
+
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_build.h"
 #include "DEG_depsgraph_query.h"
@@ -107,8 +109,7 @@ float2 node_link_calculate_multi_input_position(const float2 &socket_position,
 {
   const float offset = (total_inputs * NODE_MULTI_INPUT_LINK_GAP - NODE_MULTI_INPUT_LINK_GAP) *
                        0.5f;
-  return {socket_position.x - NODE_SOCKSIZE * 0.5f,
-          socket_position.y - offset + index * NODE_MULTI_INPUT_LINK_GAP};
+  return {socket_position.x, socket_position.y - offset + index * NODE_MULTI_INPUT_LINK_GAP};
 }
 
 static void compo_tag_output_nodes(bNodeTree *nodetree, int recalc_flags)
@@ -319,7 +320,7 @@ static void compo_completejob(void *cjv)
 /** \name Composite Job C API
  * \{ */
 
-void ED_node_composite_job(const bContext *C, struct bNodeTree *nodetree, Scene *scene_owner)
+void ED_node_composite_job(const bContext *C, bNodeTree *nodetree, Scene *scene_owner)
 {
   using namespace blender::ed::space_node;
 
@@ -463,22 +464,22 @@ void ED_node_set_tree_type(SpaceNode *snode, bNodeTreeType *typeinfo)
   }
 }
 
-bool ED_node_is_compositor(struct SpaceNode *snode)
+bool ED_node_is_compositor(SpaceNode *snode)
 {
   return STREQ(snode->tree_idname, ntreeType_Composite->idname);
 }
 
-bool ED_node_is_shader(struct SpaceNode *snode)
+bool ED_node_is_shader(SpaceNode *snode)
 {
   return STREQ(snode->tree_idname, ntreeType_Shader->idname);
 }
 
-bool ED_node_is_texture(struct SpaceNode *snode)
+bool ED_node_is_texture(SpaceNode *snode)
 {
   return STREQ(snode->tree_idname, ntreeType_Texture->idname);
 }
 
-bool ED_node_is_geometry(struct SpaceNode *snode)
+bool ED_node_is_geometry(SpaceNode *snode)
 {
   return STREQ(snode->tree_idname, ntreeType_Geometry->idname);
 }
@@ -505,12 +506,12 @@ void ED_node_shader_default(const bContext *C, ID *id)
   }
   else if (ELEM(GS(id->name), ID_WO, ID_LA)) {
     /* Emission */
-    bNodeTree *ntree = ntreeAddTree(nullptr, "Shader Nodetree", ntreeType_Shader->idname);
+    bNodeTree *ntree = ntreeAddTreeEmbedded(
+        nullptr, id, "Shader Nodetree", ntreeType_Shader->idname);
     bNode *shader, *output;
 
     if (GS(id->name) == ID_WO) {
       World *world = (World *)id;
-      world->nodetree = ntree;
 
       shader = nodeAddStaticNode(nullptr, ntree, SH_NODE_BACKGROUND);
       output = nodeAddStaticNode(nullptr, ntree, SH_NODE_OUTPUT_WORLD);
@@ -524,9 +525,6 @@ void ED_node_shader_default(const bContext *C, ID *id)
       copy_v3_v3(((bNodeSocketValueRGBA *)color_sock->default_value)->value, &world->horr);
     }
     else {
-      Light *light = (Light *)id;
-      light->nodetree = ntree;
-
       shader = nodeAddStaticNode(nullptr, ntree, SH_NODE_EMISSION);
       output = nodeAddStaticNode(nullptr, ntree, SH_NODE_OUTPUT_LIGHT);
       nodeAddLink(ntree,
@@ -549,7 +547,7 @@ void ED_node_shader_default(const bContext *C, ID *id)
   }
 }
 
-void ED_node_composit_default(const bContext *C, struct Scene *sce)
+void ED_node_composit_default(const bContext *C, Scene *sce)
 {
   /* but lets check it anyway */
   if (sce->nodetree) {
@@ -559,7 +557,8 @@ void ED_node_composit_default(const bContext *C, struct Scene *sce)
     return;
   }
 
-  sce->nodetree = ntreeAddTree(nullptr, "Compositing Nodetree", ntreeType_Composite->idname);
+  sce->nodetree = ntreeAddTreeEmbedded(
+      nullptr, &sce->id, "Compositing Nodetree", ntreeType_Composite->idname);
 
   sce->nodetree->chunksize = 256;
   sce->nodetree->edit_quality = NTREE_QUALITY_HIGH;
@@ -592,7 +591,8 @@ void ED_node_texture_default(const bContext *C, Tex *tex)
     return;
   }
 
-  tex->nodetree = ntreeAddTree(nullptr, "Texture Nodetree", ntreeType_Texture->idname);
+  tex->nodetree = ntreeAddTreeEmbedded(
+      nullptr, &tex->id, "Texture Nodetree", ntreeType_Texture->idname);
 
   bNode *out = nodeAddStaticNode(C, tex->nodetree, TEX_NODE_OUTPUT);
   out->locx = 300.0f;
@@ -713,10 +713,12 @@ void ED_node_set_active(
             /* Sync to active texpaint slot, otherwise we can end up painting on a different slot
              * than we are looking at. */
             if (ma->texpaintslot) {
-              Image *image = (Image *)node->id;
-              for (int i = 0; i < ma->tot_slots; i++) {
-                if (ma->texpaintslot[i].ima == image) {
-                  ma->paint_active_slot = i;
+              if (node->id != nullptr && GS(node->id->name) == ID_IM) {
+                Image *image = (Image *)node->id;
+                for (int i = 0; i < ma->tot_slots; i++) {
+                  if (ma->texpaintslot[i].ima == image) {
+                    ma->paint_active_slot = i;
+                  }
                 }
               }
             }
@@ -729,18 +731,28 @@ void ED_node_set_active(
           }
         }
 
-        /* Sync to Image Editor. */
-        Image *image = (Image *)node->id;
-        wmWindowManager *wm = (wmWindowManager *)bmain->wm.first;
-        LISTBASE_FOREACH (wmWindow *, win, &wm->windows) {
-          const bScreen *screen = WM_window_get_active_screen(win);
-          LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
-            LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
-              if (sl->spacetype == SPACE_IMAGE) {
+        /* Sync to Image Editor under the following conditions:
+         * - current image is not pinned
+         * - current image is not a Render Result or ViewerNode (want to keep looking at these) */
+        if (node->id != nullptr && GS(node->id->name) == ID_IM) {
+          Image *image = (Image *)node->id;
+          wmWindowManager *wm = (wmWindowManager *)bmain->wm.first;
+          LISTBASE_FOREACH (wmWindow *, win, &wm->windows) {
+            const bScreen *screen = WM_window_get_active_screen(win);
+            LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
+              LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
+                if (sl->spacetype != SPACE_IMAGE) {
+                  continue;
+                }
                 SpaceImage *sima = (SpaceImage *)sl;
-                if (!sima->pin) {
-                  ED_space_image_set(bmain, sima, image, true);
+                if (sima->pin) {
+                  continue;
                 }
+                if (sima->image &&
+                    ELEM(sima->image->type, IMA_TYPE_R_RESULT, IMA_TYPE_COMPOSITE)) {
+                  continue;
+                }
+                ED_space_image_set(bmain, sima, image, true);
               }
             }
           }
@@ -913,15 +925,24 @@ static void edit_node_properties_get(
 /** \name Node Generic
  * \{ */
 
-/* is rct in visible part of node? */
-static bNode *visible_node(SpaceNode &snode, const rctf &rct)
+static bool socket_is_occluded(const float2 &location,
+                               const bNode &node_the_socket_belongs_to,
+                               const SpaceNode &snode)
 {
   LISTBASE_FOREACH_BACKWARD (bNode *, node, &snode.edittree->nodes) {
-    if (BLI_rctf_isect(&node->totr, &rct, nullptr)) {
-      return node;
+    if (node == &node_the_socket_belongs_to) {
+      /* Nodes after this one are underneath and can't occlude the socket. */
+      return false;
+    }
+
+    rctf socket_hitbox;
+    const float socket_hitbox_radius = NODE_SOCKSIZE - 0.1f * U.widget_unit;
+    BLI_rctf_init_pt_radius(&socket_hitbox, location, socket_hitbox_radius);
+    if (BLI_rctf_inside_rctf(&node->totr, &socket_hitbox)) {
+      return true;
     }
   }
-  return nullptr;
+  return false;
 }
 
 /** \} */
@@ -939,14 +960,14 @@ struct NodeSizeWidget {
 };
 
 static void node_resize_init(
-    bContext *C, wmOperator *op, const float cursor[2], const bNode *node, NodeResizeDirection dir)
+    bContext *C, wmOperator *op, const float2 &cursor, const bNode *node, NodeResizeDirection dir)
 {
   NodeSizeWidget *nsw = MEM_cnew<NodeSizeWidget>(__func__);
 
   op->customdata = nsw;
 
-  nsw->mxstart = cursor[0];
-  nsw->mystart = cursor[1];
+  nsw->mxstart = cursor.x;
+  nsw->mystart = cursor.y;
 
   /* store old */
   nsw->oldlocx = node->locx;
@@ -993,12 +1014,12 @@ static int node_resize_modal(bContext *C, wmOperator *op, const wmEvent *event)
 
   switch (event->type) {
     case MOUSEMOVE: {
-      int mval[2];
+      int2 mval;
       WM_event_drag_start_mval(event, region, mval);
       float mx, my;
-      UI_view2d_region_to_view(&region->v2d, mval[0], mval[1], &mx, &my);
-      float dx = (mx - nsw->mxstart) / UI_DPI_FAC;
-      float dy = (my - nsw->mystart) / UI_DPI_FAC;
+      UI_view2d_region_to_view(&region->v2d, mval.x, mval.y, &mx, &my);
+      const float dx = (mx - nsw->mxstart) / UI_DPI_FAC;
+      const float dy = (my - nsw->mystart) / UI_DPI_FAC;
 
       if (node) {
         float *pwidth = &node->width;
@@ -1080,6 +1101,10 @@ static int node_resize_modal(bContext *C, wmOperator *op, const wmEvent *event)
       }
       break;
     }
+    case EVT_ESCKEY:
+      node_resize_exit(C, op, true);
+      ED_region_tag_redraw(region);
+      return OPERATOR_CANCELLED;
   }
 
   return OPERATOR_RUNNING_MODAL;
@@ -1096,11 +1121,11 @@ static int node_resize_invoke(bContext *C, wmOperator *op, const wmEvent *event)
   }
 
   /* convert mouse coordinates to v2d space */
-  float cursor[2];
-  int mval[2];
+  float2 cursor;
+  int2 mval;
   WM_event_drag_start_mval(event, region, mval);
-  UI_view2d_region_to_view(&region->v2d, mval[0], mval[1], &cursor[0], &cursor[1]);
-  const NodeResizeDirection dir = node_get_resize_direction(node, cursor[0], cursor[1]);
+  UI_view2d_region_to_view(&region->v2d, mval.x, mval.y, &cursor.x, &cursor.y);
+  const NodeResizeDirection dir = node_get_resize_direction(node, cursor.x, cursor.y);
   if (dir == NODE_RESIZE_NONE) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
@@ -1178,21 +1203,22 @@ void node_set_hidden_sockets(SpaceNode *snode, bNode *node, int set)
 }
 
 /* checks snode->mouse position, and returns found node/socket */
-static bool cursor_isect_multi_input_socket(const float cursor[2], const bNodeSocket &socket)
+static bool cursor_isect_multi_input_socket(const float2 &cursor, const bNodeSocket &socket)
 {
   const float node_socket_height = node_socket_calculate_height(socket);
-  rctf multi_socket_rect;
+  const float2 location(socket.locx, socket.locy);
   /* `.xmax = socket->locx + NODE_SOCKSIZE * 5.5f`
    * would be the same behavior as for regular sockets.
    * But keep it smaller because for multi-input socket you
    * sometimes want to drag the link to the other side, if you may
    * accidentally pick the wrong link otherwise. */
+  rctf multi_socket_rect;
   BLI_rctf_init(&multi_socket_rect,
-                socket.locx - NODE_SOCKSIZE * 4.0f,
-                socket.locx + NODE_SOCKSIZE * 2.0f,
-                socket.locy - node_socket_height,
-                socket.locy + node_socket_height);
-  if (BLI_rctf_isect_pt(&multi_socket_rect, cursor[0], cursor[1])) {
+                location.x - NODE_SOCKSIZE * 4.0f,
+                location.x + NODE_SOCKSIZE * 2.0f,
+                location.y - node_socket_height,
+                location.y + node_socket_height);
+  if (BLI_rctf_isect_pt(&multi_socket_rect, cursor.x, cursor.y)) {
     return true;
   }
   return false;
@@ -1212,10 +1238,8 @@ bool node_find_indicated_socket(SpaceNode &snode,
   *sockp = nullptr;
 
   /* check if we click in a socket */
-  LISTBASE_FOREACH (bNode *, node, &snode.edittree->nodes) {
+  LISTBASE_FOREACH_BACKWARD (bNode *, node, &snode.edittree->nodes) {
     BLI_rctf_init_pt_radius(&rect, cursor, size_sock_padded);
-    rctf node_visible;
-    BLI_rctf_init_pt_radius(&node_visible, cursor, size_sock_padded);
 
     if (!(node->flag & NODE_HIDDEN)) {
       /* extra padding inside and out - allow dragging on the text areas too */
@@ -1232,17 +1256,18 @@ bool node_find_indicated_socket(SpaceNode &snode,
     if (in_out & SOCK_IN) {
       LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
         if (!nodeSocketIsHidden(sock)) {
+          const float2 location(sock->locx, sock->locy);
           if (sock->flag & SOCK_MULTI_INPUT && !(node->flag & NODE_HIDDEN)) {
             if (cursor_isect_multi_input_socket(cursor, *sock)) {
-              if (node == visible_node(snode, node_visible)) {
+              if (!socket_is_occluded(location, *node, snode)) {
                 *nodep = node;
                 *sockp = sock;
                 return true;
               }
             }
           }
-          else if (BLI_rctf_isect_pt(&rect, sock->locx, sock->locy)) {
-            if (node == visible_node(snode, node_visible)) {
+          else if (BLI_rctf_isect_pt(&rect, location.x, location.y)) {
+            if (!socket_is_occluded(location, *node, snode)) {
               *nodep = node;
               *sockp = sock;
               return true;
@@ -1254,8 +1279,9 @@ bool node_find_indicated_socket(SpaceNode &snode,
     if (in_out & SOCK_OUT) {
       LISTBASE_FOREACH (bNodeSocket *, sock, &node->outputs) {
         if (!nodeSocketIsHidden(sock)) {
-          if (BLI_rctf_isect_pt(&rect, sock->locx, sock->locy)) {
-            if (node == visible_node(snode, node_visible)) {
+          const float2 location(sock->locx, sock->locy);
+          if (BLI_rctf_isect_pt(&rect, location.x, location.y)) {
+            if (!socket_is_occluded(location, *node, snode)) {
               *nodep = node;
               *sockp = sock;
               return true;
@@ -1281,11 +1307,12 @@ float node_link_dim_factor(const View2D &v2d, const bNodeLink &link)
     return 1.0f;
   }
 
+  const float2 from(link.fromsock->locx, link.fromsock->locy);
+  const float2 to(link.tosock->locx, link.tosock->locy);
+
   const float min_endpoint_distance = std::min(
-      std::max(BLI_rctf_length_x(&v2d.cur, link.fromsock->locx),
-               BLI_rctf_length_y(&v2d.cur, link.fromsock->locy)),
-      std::max(BLI_rctf_length_x(&v2d.cur, link.tosock->locx),
-               BLI_rctf_length_y(&v2d.cur, link.tosock->locy)));
+      std::max(BLI_rctf_length_x(&v2d.cur, from.x), BLI_rctf_length_y(&v2d.cur, from.y)),
+      std::max(BLI_rctf_length_x(&v2d.cur, to.x), BLI_rctf_length_y(&v2d.cur, to.y)));
 
   if (min_endpoint_distance == 0.0f) {
     return 1.0f;
@@ -1344,7 +1371,7 @@ static int node_duplicate_exec(bContext *C, wmOperator *op)
   bNode *lastnode = (bNode *)ntree->nodes.last;
   LISTBASE_FOREACH (bNode *, node, &ntree->nodes) {
     if (node->flag & SELECT) {
-      bNode *new_node = blender::bke::node_copy_with_mapping(
+      bNode *new_node = bke::node_copy_with_mapping(
           ntree, *node, LIB_ID_COPY_DEFAULT, true, socket_map);
       node_map.add_new(node, new_node);
       changed = true;
@@ -1451,43 +1478,6 @@ void NODE_OT_duplicate(wmOperatorType *ot)
       ot->srna, "keep_inputs", false, "Keep Inputs", "Keep the input links to duplicated nodes");
 }
 
-static bool node_select_check(const ListBase *lb)
-{
-  LISTBASE_FOREACH (const bNode *, node, lb) {
-    if (node->flag & NODE_SELECT) {
-      return true;
-    }
-  }
-
-  return false;
-}
-
-void node_select_all(ListBase *lb, int action)
-{
-  if (action == SEL_TOGGLE) {
-    if (node_select_check(lb)) {
-      action = SEL_DESELECT;
-    }
-    else {
-      action = SEL_SELECT;
-    }
-  }
-
-  LISTBASE_FOREACH (bNode *, node, lb) {
-    switch (action) {
-      case SEL_SELECT:
-        nodeSetSelected(node, true);
-        break;
-      case SEL_DESELECT:
-        nodeSetSelected(node, false);
-        break;
-      case SEL_INVERT:
-        nodeSetSelected(node, !(node->flag & SELECT));
-        break;
-    }
-  }
-}
-
 /* XXX: some code needing updating to operators. */
 
 /* goes over all scenes, reads render layers */
@@ -2149,24 +2139,23 @@ static int node_copy_color_exec(bContext *C, wmOperator *UNUSED(op))
   SpaceNode &snode = *CTX_wm_space_node(C);
   bNodeTree &ntree = *snode.edittree;
 
-  bNode *node = nodeGetActive(&ntree);
-  if (!node) {
+  bNode *active_node = nodeGetActive(&ntree);
+  if (!active_node) {
     return OPERATOR_CANCELLED;
   }
 
-  LISTBASE_FOREACH (bNode *, node_iter, &ntree.nodes) {
-    if (node_iter->flag & NODE_SELECT && node_iter != node) {
-      if (node->flag & NODE_CUSTOM_COLOR) {
-        node_iter->flag |= NODE_CUSTOM_COLOR;
-        copy_v3_v3(node_iter->color, node->color);
+  LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
+    if (node->flag & NODE_SELECT && node != active_node) {
+      if (active_node->flag & NODE_CUSTOM_COLOR) {
+        node->flag |= NODE_CUSTOM_COLOR;
+        copy_v3_v3(node->color, active_node->color);
       }
       else {
-        node_iter->flag &= ~NODE_CUSTOM_COLOR;
+        node->flag &= ~NODE_CUSTOM_COLOR;
       }
     }
   }
 
-  node_sort(ntree);
   WM_event_add_notifier(C, NC_NODE | ND_DISPLAY, nullptr);
 
   return OPERATOR_FINISHED;
@@ -2211,12 +2200,12 @@ static int node_clipboard_copy_exec(bContext *C, wmOperator *UNUSED(op))
     if (node->flag & SELECT) {
       /* No ID refcounting, this node is virtual,
        * detached from any actual Blender data currently. */
-      bNode *new_node = blender::bke::node_copy_with_mapping(nullptr,
-                                                             *node,
-                                                             LIB_ID_CREATE_NO_USER_REFCOUNT |
-                                                                 LIB_ID_CREATE_NO_MAIN,
-                                                             false,
-                                                             socket_map);
+      bNode *new_node = bke::node_copy_with_mapping(nullptr,
+                                                    *node,
+                                                    LIB_ID_CREATE_NO_USER_REFCOUNT |
+                                                        LIB_ID_CREATE_NO_MAIN,
+                                                    false,
+                                                    socket_map);
       node_map.add_new(node, new_node);
     }
   }
@@ -2336,11 +2325,11 @@ static int node_clipboard_paste_exec(bContext *C, wmOperator *op)
   node_deselect_all(*snode);
 
   /* calculate "barycenter" for placing on mouse cursor */
-  float center[2] = {0.0f, 0.0f};
+  float2 center = {0.0f, 0.0f};
   int num_nodes = 0;
   LISTBASE_FOREACH_INDEX (bNode *, node, clipboard_nodes_lb, num_nodes) {
-    center[0] += BLI_rctf_cent_x(&node->totr);
-    center[1] += BLI_rctf_cent_y(&node->totr);
+    center.x += BLI_rctf_cent_x(&node->totr);
+    center.y += BLI_rctf_cent_y(&node->totr);
   }
   mul_v2_fl(center, 1.0 / num_nodes);
 
@@ -2349,7 +2338,7 @@ static int node_clipboard_paste_exec(bContext *C, wmOperator *op)
 
   /* copy nodes from clipboard */
   LISTBASE_FOREACH (bNode *, node, clipboard_nodes_lb) {
-    bNode *new_node = blender::bke::node_copy_with_mapping(
+    bNode *new_node = bke::node_copy_with_mapping(
         ntree, *node, LIB_ID_COPY_DEFAULT, true, socket_map);
     node_map.add_new(node, new_node);
   }
@@ -2424,7 +2413,7 @@ static int ntree_socket_add_exec(bContext *C, wmOperator *op)
   const eNodeSocketInOut in_out = (eNodeSocketInOut)RNA_enum_get(op->ptr, "in_out");
   ListBase *sockets = (in_out == SOCK_IN) ? &ntree->inputs : &ntree->outputs;
 
-  const char *default_name = (in_out == SOCK_IN) ? "Input" : "Output";
+  const char *default_name = (in_out == SOCK_IN) ? DATA_("Input") : DATA_("Output");
   bNodeSocket *active_sock = ntree_get_active_interface_socket(sockets);
 
   bNodeSocket *sock;
@@ -2548,7 +2537,7 @@ static int ntree_socket_change_type_exec(bContext *C, wmOperator *op)
     return OPERATOR_FINISHED;
   }
 
-  /* Don't handle subtypes for now. */
+  /* Don't handle sub-types for now. */
   nodeModifySocketType(ntree, nullptr, iosock, socket_type->idname);
 
   /* Need the extra update here because the loop above does not check for valid links in the node
diff --git a/source/blender/editors/space_node/node_geometry_attribute_search.cc b/source/blender/editors/space_node/node_geometry_attribute_search.cc
index e328a86b0fd..809c4b2fe59 100644
--- a/source/blender/editors/space_node/node_geometry_attribute_search.cc
+++ b/source/blender/editors/space_node/node_geometry_attribute_search.cc
@@ -14,6 +14,7 @@
 #include "DNA_space_types.h"
 
 #include "BKE_context.h"
+#include "BKE_node_runtime.hh"
 #include "BKE_node_tree_update.h"
 #include "BKE_object.h"
 
@@ -30,12 +31,11 @@
 #include "UI_interface.hh"
 #include "UI_resources.h"
 
-#include "NOD_geometry_nodes_eval_log.hh"
+#include "NOD_geometry_nodes_log.hh"
 
 #include "node_intern.hh"
 
-namespace geo_log = blender::nodes::geometry_nodes_eval_log;
-using geo_log::GeometryAttributeInfo;
+using blender::nodes::geo_eval_log::GeometryAttributeInfo;
 
 namespace blender::ed::space_node {
 
@@ -50,6 +50,8 @@ BLI_STATIC_ASSERT(std::is_trivially_destructible_v<AttributeSearchData>, "");
 static Vector<const GeometryAttributeInfo *> get_attribute_info_from_context(
     const bContext &C, AttributeSearchData &data)
 {
+  using namespace nodes::geo_eval_log;
+
   SpaceNode *snode = CTX_wm_space_node(&C);
   if (!snode) {
     BLI_assert_unreachable();
@@ -65,41 +67,48 @@ static Vector<const GeometryAttributeInfo *> get_attribute_info_from_context(
     BLI_assert_unreachable();
     return {};
   }
+  GeoTreeLog *tree_log = GeoModifierLog::get_tree_log_for_node_editor(*snode);
+  if (tree_log == nullptr) {
+    return {};
+  }
+  tree_log->ensure_socket_values();
 
   /* For the attribute input node, collect attribute information from all nodes in the group. */
   if (node->type == GEO_NODE_INPUT_NAMED_ATTRIBUTE) {
-    const geo_log::TreeLog *tree_log = geo_log::ModifierLog::find_tree_by_node_editor_context(
-        *snode);
-    if (tree_log == nullptr) {
-      return {};
-    }
-
+    tree_log->ensure_existing_attributes();
     Vector<const GeometryAttributeInfo *> attributes;
-    Set<StringRef> names;
-    tree_log->foreach_node_log([&](const geo_log::NodeLog &node_log) {
-      for (const geo_log::SocketLog &socket_log : node_log.input_logs()) {
-        const geo_log::ValueLog *value_log = socket_log.value();
-        if (const geo_log::GeometryValueLog *geo_value_log =
-                dynamic_cast<const geo_log::GeometryValueLog *>(value_log)) {
-          for (const GeometryAttributeInfo &attribute : geo_value_log->attributes()) {
-            if (bke::allow_procedural_attribute_access(attribute.name)) {
-              if (names.add(attribute.name)) {
-                attributes.append(&attribute);
-              }
-            }
-          }
-        }
+    for (const GeometryAttributeInfo *attribute : tree_log->existing_attributes) {
+      if (bke::allow_procedural_attribute_access(attribute->name)) {
+        attributes.append(attribute);
       }
-    });
+    }
     return attributes;
   }
-
-  const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_node_editor_context(
-      *snode, data.node_name);
+  GeoNodeLog *node_log = tree_log->nodes.lookup_ptr(node->name);
   if (node_log == nullptr) {
     return {};
   }
-  return node_log->lookup_available_attributes();
+  Set<StringRef> names;
+  Vector<const GeometryAttributeInfo *> attributes;
+  for (const bNodeSocket *input_socket : node->input_sockets()) {
+    if (input_socket->type != SOCK_GEOMETRY) {
+      continue;
+    }
+    const ValueLog *value_log = tree_log->find_socket_value_log(*input_socket);
+    if (value_log == nullptr) {
+      continue;
+    }
+    if (const GeometryInfoLog *geo_log = dynamic_cast<const GeometryInfoLog *>(value_log)) {
+      for (const GeometryAttributeInfo &attribute : geo_log->attributes) {
+        if (bke::allow_procedural_attribute_access(attribute.name)) {
+          if (names.add(attribute.name)) {
+            attributes.append(&attribute);
+          }
+        }
+      }
+    }
+  }
+  return attributes;
 }
 
 static void attribute_search_update_fn(
diff --git a/source/blender/editors/space_node/node_gizmo.cc b/source/blender/editors/space_node/node_gizmo.cc
index 4f27f9baabc..f9126556b71 100644
--- a/source/blender/editors/space_node/node_gizmo.cc
+++ b/source/blender/editors/space_node/node_gizmo.cc
@@ -49,14 +49,14 @@ static void node_gizmo_calc_matrix_space(const SpaceNode *snode,
 
 static void node_gizmo_calc_matrix_space_with_image_dims(const SpaceNode *snode,
                                                          const ARegion *region,
-                                                         const float image_dims[2],
+                                                         const float2 &image_dims,
                                                          float matrix_space[4][4])
 {
   unit_m4(matrix_space);
-  mul_v3_fl(matrix_space[0], snode->zoom * image_dims[0]);
-  mul_v3_fl(matrix_space[1], snode->zoom * image_dims[1]);
-  matrix_space[3][0] = ((region->winx / 2) + snode->xof) - ((image_dims[0] / 2.0f) * snode->zoom);
-  matrix_space[3][1] = ((region->winy / 2) + snode->yof) - ((image_dims[1] / 2.0f) * snode->zoom);
+  mul_v3_fl(matrix_space[0], snode->zoom * image_dims.x);
+  mul_v3_fl(matrix_space[1], snode->zoom * image_dims.y);
+  matrix_space[3][0] = ((region->winx / 2) + snode->xof) - ((image_dims.x / 2.0f) * snode->zoom);
+  matrix_space[3][1] = ((region->winy / 2) + snode->yof) - ((image_dims.y / 2.0f) * snode->zoom);
 }
 
 /** \} */
@@ -135,7 +135,7 @@ static void WIDGETGROUP_node_transform_refresh(const bContext *C, wmGizmoGroup *
   ImBuf *ibuf = BKE_image_acquire_ibuf(ima, nullptr, &lock);
 
   if (ibuf) {
-    const float dims[2] = {
+    const float2 dims = {
         (ibuf->x > 0) ? ibuf->x : 64.0f,
         (ibuf->y > 0) ? ibuf->y : 64.0f,
     };
@@ -190,7 +190,7 @@ struct NodeCropWidgetGroup {
   wmGizmo *border;
 
   struct {
-    float dims[2];
+    float2 dims;
   } state;
 
   struct {
@@ -206,10 +206,7 @@ static void gizmo_node_crop_update(struct NodeCropWidgetGroup *crop_group)
       crop_group->update_data.context, &crop_group->update_data.ptr, crop_group->update_data.prop);
 }
 
-static void two_xy_to_rect(const NodeTwoXYs *nxy,
-                           rctf *rect,
-                           const float dims[2],
-                           bool is_relative)
+static void two_xy_to_rect(const NodeTwoXYs *nxy, rctf *rect, const float2 &dims, bool is_relative)
 {
   if (is_relative) {
     rect->xmin = nxy->fac_x1;
@@ -218,16 +215,16 @@ static void two_xy_to_rect(const NodeTwoXYs *nxy,
     rect->ymax = nxy->fac_y2;
   }
   else {
-    rect->xmin = nxy->x1 / dims[0];
-    rect->xmax = nxy->x2 / dims[0];
-    rect->ymin = nxy->y1 / dims[1];
-    rect->ymax = nxy->y2 / dims[1];
+    rect->xmin = nxy->x1 / dims.x;
+    rect->xmax = nxy->x2 / dims.x;
+    rect->ymin = nxy->y1 / dims.y;
+    rect->ymax = nxy->y2 / dims.y;
   }
 }
 
 static void two_xy_from_rect(NodeTwoXYs *nxy,
                              const rctf *rect,
-                             const float dims[2],
+                             const float2 &dims,
                              bool is_relative)
 {
   if (is_relative) {
@@ -237,10 +234,10 @@ static void two_xy_from_rect(NodeTwoXYs *nxy,
     nxy->fac_y2 = rect->ymax;
   }
   else {
-    nxy->x1 = rect->xmin * dims[0];
-    nxy->x2 = rect->xmax * dims[0];
-    nxy->y1 = rect->ymin * dims[1];
-    nxy->y2 = rect->ymax * dims[1];
+    nxy->x1 = rect->xmin * dims.x;
+    nxy->x2 = rect->xmax * dims.x;
+    nxy->y1 = rect->ymin * dims.y;
+    nxy->y2 = rect->ymax * dims.y;
   }
 }
 
@@ -321,9 +318,7 @@ static bool WIDGETGROUP_node_crop_poll(const bContext *C, wmGizmoGroupType *UNUS
 
 static void WIDGETGROUP_node_crop_setup(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
 {
-  struct NodeCropWidgetGroup *crop_group = (NodeCropWidgetGroup *)MEM_mallocN(
-      sizeof(struct NodeCropWidgetGroup), __func__);
-
+  NodeCropWidgetGroup *crop_group = MEM_new<NodeCropWidgetGroup>(__func__);
   crop_group->border = WM_gizmo_new("GIZMO_GT_cage_2d", gzgroup, nullptr);
 
   RNA_enum_set(crop_group->border->ptr,
@@ -407,7 +402,7 @@ struct NodeSunBeamsWidgetGroup {
   wmGizmo *gizmo;
 
   struct {
-    float dims[2];
+    float2 dims;
   } state;
 };
 
@@ -512,7 +507,7 @@ struct NodeCornerPinWidgetGroup {
   wmGizmo *gizmos[4];
 
   struct {
-    float dims[2];
+    float2 dims;
   } state;
 };
 
diff --git a/source/blender/editors/space_node/node_group.cc b/source/blender/editors/space_node/node_group.cc
index 160a379d3c6..21def1bd9d7 100644
--- a/source/blender/editors/space_node/node_group.cc
+++ b/source/blender/editors/space_node/node_group.cc
@@ -25,6 +25,7 @@
 #include "BKE_context.h"
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
+#include "BKE_node_runtime.hh"
 #include "BKE_node_tree_update.h"
 #include "BKE_report.h"
 
@@ -36,6 +37,7 @@
 
 #include "RNA_access.h"
 #include "RNA_define.h"
+#include "RNA_path.h"
 #include "RNA_prototypes.h"
 
 #include "WM_api.h"
@@ -44,7 +46,12 @@
 #include "UI_resources.h"
 
 #include "NOD_common.h"
+#include "NOD_composite.h"
+#include "NOD_geometry.h"
+#include "NOD_shader.h"
 #include "NOD_socket.h"
+#include "NOD_texture.h"
+
 #include "node_intern.hh" /* own include */
 
 namespace blender::ed::space_node {
@@ -99,16 +106,16 @@ const char *node_group_idname(bContext *C)
   SpaceNode *snode = CTX_wm_space_node(C);
 
   if (ED_node_is_shader(snode)) {
-    return "ShaderNodeGroup";
+    return ntreeType_Shader->group_idname;
   }
   if (ED_node_is_compositor(snode)) {
-    return "CompositorNodeGroup";
+    return ntreeType_Composite->group_idname;
   }
   if (ED_node_is_texture(snode)) {
-    return "TextureNodeGroup";
+    return ntreeType_Texture->group_idname;
   }
   if (ED_node_is_geometry(snode)) {
-    return "GeometryNodeGroup";
+    return ntreeType_Geometry->group_idname;
   }
 
   return "";
@@ -456,8 +463,7 @@ static bool node_group_separate_selected(
     bNode *newnode;
     if (make_copy) {
       /* make a copy */
-      newnode = blender::bke::node_copy_with_mapping(
-          &ngroup, *node, LIB_ID_COPY_DEFAULT, true, socket_map);
+      newnode = bke::node_copy_with_mapping(&ngroup, *node, LIB_ID_COPY_DEFAULT, true, socket_map);
       node_map.add_new(node, newnode);
     }
     else {
@@ -647,7 +653,7 @@ static bool node_group_make_use_node(bNode &node, bNode *gnode)
 static bool node_group_make_test_selected(bNodeTree &ntree,
                                           bNode *gnode,
                                           const char *ntree_idname,
-                                          struct ReportList &reports)
+                                          ReportList &reports)
 {
   int ok = true;
 
@@ -711,13 +717,13 @@ static int node_get_selected_minmax(
   INIT_MINMAX2(min, max);
   LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
     if (node_group_make_use_node(*node, gnode)) {
-      float loc[2];
-      nodeToView(node, node->offsetx, node->offsety, &loc[0], &loc[1]);
-      minmax_v2v2_v2(min, max, loc);
+      float2 loc;
+      nodeToView(node, node->offsetx, node->offsety, &loc.x, &loc.y);
+      math::min_max(loc, min, max);
       if (use_size) {
-        loc[0] += node->width;
-        loc[1] -= node->height;
-        minmax_v2v2_v2(min, max, loc);
+        loc.x += node->width;
+        loc.y -= node->height;
+        math::min_max(loc, min, max);
       }
       totselect++;
     }
@@ -831,8 +837,8 @@ static void node_group_make_insert_selected(const bContext &C, bNodeTree &ntree,
 
   /* relink external sockets */
   LISTBASE_FOREACH_MUTABLE (bNodeLink *, link, &ntree.links) {
-    int fromselect = node_group_make_use_node(*link->fromnode, gnode);
-    int toselect = node_group_make_use_node(*link->tonode, gnode);
+    const bool fromselect = node_group_make_use_node(*link->fromnode, gnode);
+    const bool toselect = node_group_make_use_node(*link->tonode, gnode);
 
     if ((fromselect && link->tonode == gnode) || (toselect && link->fromnode == gnode)) {
       /* remove all links to/from the gnode.
@@ -912,8 +918,8 @@ static void node_group_make_insert_selected(const bContext &C, bNodeTree &ntree,
 
   /* move internal links */
   LISTBASE_FOREACH_MUTABLE (bNodeLink *, link, &ntree.links) {
-    int fromselect = node_group_make_use_node(*link->fromnode, gnode);
-    int toselect = node_group_make_use_node(*link->tonode, gnode);
+    const bool fromselect = node_group_make_use_node(*link->fromnode, gnode);
+    const bool toselect = node_group_make_use_node(*link->tonode, gnode);
 
     if (fromselect && toselect) {
       BLI_remlink(&ntree.links, link);
@@ -1036,9 +1042,6 @@ static int node_group_make_exec(bContext *C, wmOperator *op)
     nodeSetActive(&ntree, gnode);
     if (ngroup) {
       ED_node_tree_push(&snode, ngroup, gnode);
-      LISTBASE_FOREACH (bNode *, node, &ngroup->nodes) {
-        sort_multi_input_socket_links(snode, *node, nullptr, nullptr);
-      }
     }
   }
 
diff --git a/source/blender/editors/space_node/node_intern.hh b/source/blender/editors/space_node/node_intern.hh
index 924537d0e8a..70ac0e48d01 100644
--- a/source/blender/editors/space_node/node_intern.hh
+++ b/source/blender/editors/space_node/node_intern.hh
@@ -9,6 +9,7 @@
 
 #include "BLI_math_vector.h"
 #include "BLI_math_vector.hh"
+#include "BLI_set.hh"
 #include "BLI_vector.hh"
 
 #include "BKE_node.h"
@@ -144,7 +145,10 @@ void node_socket_color_get(const bContext &C,
 
 void node_draw_space(const bContext &C, ARegion &region);
 
-void node_socket_add_tooltip(bNodeTree *ntree, bNode *node, bNodeSocket *sock, uiLayout *layout);
+void node_socket_add_tooltip(const bNodeTree &ntree,
+                             const bNode &node,
+                             const bNodeSocket &sock,
+                             uiLayout &layout);
 
 /**
  * Sort nodes by selection: unselected nodes first, then selected,
@@ -166,8 +170,9 @@ void node_keymap(wmKeyConfig *keyconf);
 /* node_select.cc */
 
 rctf node_frame_rect_inside(const bNode &node);
-bool node_or_socket_isect_event(bContext *C, const wmEvent *event);
+bool node_or_socket_isect_event(const bContext &C, const wmEvent &event);
 
+Set<bNode *> get_selected_nodes(bNodeTree &node_tree);
 void node_deselect_all(SpaceNode &snode);
 void node_socket_select(bNode *node, bNodeSocket &sock);
 void node_socket_deselect(bNode *node, bNodeSocket &sock, bool deselect_node);
@@ -214,6 +219,10 @@ void node_draw_link(const bContext &C,
                     const SpaceNode &snode,
                     const bNodeLink &link,
                     bool selected);
+void node_draw_link_dragged(const bContext &C,
+                            const View2D &v2d,
+                            const SpaceNode &snode,
+                            const bNodeLink &link);
 /**
  * Don't do shadows if th_col3 is -1.
  */
@@ -225,19 +234,12 @@ void node_draw_link_bezier(const bContext &C,
                            int th_col2,
                            int th_col3,
                            bool selected);
-/** If v2d not nullptr, it clips and returns 0 if not visible. */
-bool node_link_bezier_points(const View2D *v2d,
-                             const SpaceNode *snode,
-                             const bNodeLink &link,
-                             float coord_array[][2],
-                             int resol);
-/**
- * Return quadratic beziers points for a given nodelink and clip if v2d is not nullptr.
- */
-bool node_link_bezier_handles(const View2D *v2d,
-                              const SpaceNode *snode,
-                              const bNodeLink &ink,
-                              float vec[4][2]);
+
+void node_link_bezier_points_evaluated(const bNodeLink &link,
+                                       std::array<float2, NODE_LINK_RESOL + 1> &coords);
+
+std::optional<float2> link_path_intersection(const bNodeLink &link, Span<float2> path);
+
 void draw_nodespace_back_pix(const bContext &C,
                              ARegion &region,
                              SpaceNode &snode,
@@ -245,13 +247,11 @@ void draw_nodespace_back_pix(const bContext &C,
 
 /* node_add.cc */
 
-/**
- * XXX Does some additional initialization on top of #nodeAddNode
- * Can be used with both custom and static nodes,
- * if `idname == nullptr` the static int type will be used instead.
- */
-bNode *node_add_node(const bContext &C, const char *idname, int type, float locx, float locy);
+bNode *add_node(const bContext &C, StringRef idname, const float2 &location);
+bNode *add_static_node(const bContext &C, int type, const float2 &location);
+
 void NODE_OT_add_reroute(wmOperatorType *ot);
+void NODE_OT_add_search(wmOperatorType *ot);
 void NODE_OT_add_group(wmOperatorType *ot);
 void NODE_OT_add_object(wmOperatorType *ot);
 void NODE_OT_add_collection(wmOperatorType *ot);
@@ -270,11 +270,6 @@ void NODE_OT_group_edit(wmOperatorType *ot);
 
 /* node_relationships.cc */
 
-void sort_multi_input_socket_links(SpaceNode &snode,
-                                   bNode &node,
-                                   bNodeLink *drag_link,
-                                   const float2 *cursor);
-
 void NODE_OT_link(wmOperatorType *ot);
 void NODE_OT_link_make(wmOperatorType *ot);
 void NODE_OT_links_cut(wmOperatorType *ot);
@@ -296,8 +291,6 @@ float2 node_link_calculate_multi_input_position(const float2 &socket_position,
                                                 int index,
                                                 int total_inputs);
 
-void node_select_all(ListBase *lb, int action);
-
 float node_socket_calculate_height(const bNodeSocket &socket);
 
 void snode_set_context(const bContext &C);
@@ -383,4 +376,8 @@ void invoke_node_link_drag_add_menu(bContext &C,
                                     bNodeSocket &socket,
                                     const float2 &cursor);
 
+/* add_node_search.cc */
+
+void invoke_add_node_search_menu(bContext &C, const float2 &cursor, bool use_transform);
+
 }  // namespace blender::ed::space_node
diff --git a/source/blender/editors/space_node/node_ops.cc b/source/blender/editors/space_node/node_ops.cc
index ce000aba1da..f02c019359d 100644
--- a/source/blender/editors/space_node/node_ops.cc
+++ b/source/blender/editors/space_node/node_ops.cc
@@ -75,6 +75,7 @@ void node_operatortypes()
   WM_operatortype_append(NODE_OT_backimage_fit);
   WM_operatortype_append(NODE_OT_backimage_sample);
 
+  WM_operatortype_append(NODE_OT_add_search);
   WM_operatortype_append(NODE_OT_add_group);
   WM_operatortype_append(NODE_OT_add_object);
   WM_operatortype_append(NODE_OT_add_collection);
@@ -111,7 +112,7 @@ void node_operatortypes()
   WM_operatortype_append(NODE_OT_cryptomatte_layer_remove);
 }
 
-void node_keymap(struct wmKeyConfig *keyconf)
+void node_keymap(wmKeyConfig *keyconf)
 {
   /* Entire Editor only ----------------- */
   WM_keymap_ensure(keyconf, "Node Generic", SPACE_NODE, 0);
@@ -144,7 +145,7 @@ void ED_operatormacros_node()
   WM_operatortype_macro_define(ot, "NODE_OT_attach");
   WM_operatortype_macro_define(ot, "NODE_OT_insert_offset");
 
-  /* NODE_OT_translate_attach with remove_on_canel set to true */
+  /* NODE_OT_translate_attach with remove_on_cancel set to true. */
   ot = WM_operatortype_append_macro("NODE_OT_translate_attach_remove_on_cancel",
                                     "Move and Attach",
                                     "Move nodes and attach to frame",
diff --git a/source/blender/editors/space_node/node_relationships.cc b/source/blender/editors/space_node/node_relationships.cc
index e10bedb18f4..e12ab3191cb 100644
--- a/source/blender/editors/space_node/node_relationships.cc
+++ b/source/blender/editors/space_node/node_relationships.cc
@@ -11,6 +11,7 @@
 #include "DNA_node_types.h"
 
 #include "BLI_easing.h"
+#include "BLI_stack.hh"
 
 #include "BKE_anim_data.h"
 #include "BKE_context.h"
@@ -18,6 +19,7 @@
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
+#include "BKE_node_runtime.hh"
 #include "BKE_node_tree_update.h"
 #include "BKE_screen.h"
 
@@ -46,19 +48,11 @@
 #include "BLT_translation.h"
 
 #include "NOD_node_declaration.hh"
-#include "NOD_node_tree_ref.hh"
 #include "NOD_socket_declarations.hh"
 #include "NOD_socket_declarations_geometry.hh"
 
 #include "node_intern.hh" /* own include */
 
-using namespace blender::nodes::node_tree_ref_types;
-
-struct bNodeListItem {
-  struct bNodeListItem *next, *prev;
-  struct bNode *node;
-};
-
 struct NodeInsertOfsData {
   bNodeTree *ntree;
   bNode *insert;      /* inserted node */
@@ -79,6 +73,8 @@ static void clear_picking_highlight(ListBase *links)
 
 namespace blender::ed::space_node {
 
+void update_multi_input_indices_for_removed_links(bNode &node);
+
 /* -------------------------------------------------------------------- */
 /** \name Add Node
  * \{ */
@@ -109,11 +105,9 @@ static void pick_link(
 
   nldrag.links.append(link);
   nodeRemLink(snode.edittree, &link_to_pick);
-
+  snode.edittree->ensure_topology_cache();
   BLI_assert(nldrag.last_node_hovered_while_dragging_a_link != nullptr);
-
-  sort_multi_input_socket_links(
-      snode, *nldrag.last_node_hovered_while_dragging_a_link, nullptr, nullptr);
+  update_multi_input_indices_for_removed_links(*nldrag.last_node_hovered_while_dragging_a_link);
 
   /* Send changed event to original link->tonode. */
   if (node) {
@@ -127,10 +121,8 @@ static void pick_input_link_by_link_intersect(const bContext &C,
                                               const float2 &cursor)
 {
   SpaceNode *snode = CTX_wm_space_node(&C);
-  const ARegion *region = CTX_wm_region(&C);
-  const View2D *v2d = &region->v2d;
 
-  float drag_start[2];
+  float2 drag_start;
   RNA_float_get_array(op.ptr, "drag_start", drag_start);
   bNode *node;
   bNodeSocket *socket;
@@ -139,26 +131,16 @@ static void pick_input_link_by_link_intersect(const bContext &C,
   /* Distance to test overlapping of cursor on link. */
   const float cursor_link_touch_distance = 12.5f * UI_DPI_FAC;
 
-  const int resolution = NODE_LINK_RESOL;
-
   bNodeLink *link_to_pick = nullptr;
   clear_picking_highlight(&snode->edittree->links);
   LISTBASE_FOREACH (bNodeLink *, link, &snode->edittree->links) {
     if (link->tosock == socket) {
       /* Test if the cursor is near a link. */
-      float vec[4][2];
-      node_link_bezier_handles(v2d, snode, *link, vec);
-
-      float data[NODE_LINK_RESOL * 2 + 2];
-      BKE_curve_forward_diff_bezier(
-          vec[0][0], vec[1][0], vec[2][0], vec[3][0], data, resolution, sizeof(float[2]));
-      BKE_curve_forward_diff_bezier(
-          vec[0][1], vec[1][1], vec[2][1], vec[3][1], data + 1, resolution, sizeof(float[2]));
-
-      for (int i = 0; i < resolution * 2; i += 2) {
-        float *l1 = &data[i];
-        float *l2 = &data[i + 2];
-        float distance = dist_squared_to_line_segment_v2(cursor, l1, l2);
+      std::array<float2, NODE_LINK_RESOL + 1> coords;
+      node_link_bezier_points_evaluated(*link, coords);
+
+      for (const int i : IndexRange(coords.size() - 1)) {
+        const float distance = dist_squared_to_line_segment_v2(cursor, coords[i], coords[i + 1]);
         if (distance < cursor_link_touch_distance) {
           link_to_pick = link;
           nldrag.last_picked_multi_input_socket_link = link_to_pick;
@@ -310,35 +292,24 @@ struct LinkAndPosition {
   float2 multi_socket_position;
 };
 
-void sort_multi_input_socket_links(SpaceNode &snode,
-                                   bNode &node,
-                                   bNodeLink *drag_link,
-                                   const float2 *cursor)
+static void sort_multi_input_socket_links_with_drag(bNode &node,
+                                                    bNodeLink &drag_link,
+                                                    const float2 &cursor)
 {
-  LISTBASE_FOREACH (bNodeSocket *, socket, &node.inputs) {
-    if (!(socket->flag & SOCK_MULTI_INPUT)) {
+  for (bNodeSocket *socket : node.input_sockets()) {
+    if (!socket->is_multi_input()) {
       continue;
     }
-    Vector<LinkAndPosition, 8> links;
+    const float2 &socket_location = {socket->locx, socket->locy};
 
-    LISTBASE_FOREACH (bNodeLink *, link, &snode.edittree->links) {
-      if (link->tosock == socket) {
-        links.append(
-            {link,
-             node_link_calculate_multi_input_position({link->tosock->locx, link->tosock->locy},
-                                                      link->multi_input_socket_index,
-                                                      link->tosock->total_inputs)});
-      }
-    }
+    Vector<LinkAndPosition, 8> links;
+    for (bNodeLink *link : socket->directly_linked_links()) {
+      const float2 location = node_link_calculate_multi_input_position(
+          socket_location, link->multi_input_socket_index, link->tosock->total_inputs);
+      links.append({link, location});
+    };
 
-    if (drag_link) {
-      LinkAndPosition link_and_position{};
-      link_and_position.link = drag_link;
-      if (cursor) {
-        link_and_position.multi_socket_position = *cursor;
-      }
-      links.append(link_and_position);
-    }
+    links.append({&drag_link, cursor});
 
     std::sort(links.begin(), links.end(), [](const LinkAndPosition a, const LinkAndPosition b) {
       return a.multi_socket_position.y < b.multi_socket_position.y;
@@ -350,6 +321,23 @@ void sort_multi_input_socket_links(SpaceNode &snode,
   }
 }
 
+void update_multi_input_indices_for_removed_links(bNode &node)
+{
+  for (bNodeSocket *socket : node.input_sockets()) {
+    if (!socket->is_multi_input()) {
+      continue;
+    }
+    Vector<bNodeLink *, 8> links = socket->directly_linked_links();
+    std::sort(links.begin(), links.end(), [](const bNodeLink *a, const bNodeLink *b) {
+      return a->multi_input_socket_index < b->multi_input_socket_index;
+    });
+
+    for (const int i : links.index_range()) {
+      links[i]->multi_input_socket_index = i;
+    }
+  }
+}
+
 static void snode_autoconnect(SpaceNode &snode, const bool allow_multiple, const bool replace)
 {
   bNodeTree *ntree = snode.edittree;
@@ -434,18 +422,18 @@ namespace viewer_linking {
  * \{ */
 
 /* Depending on the node tree type, different socket types are supported by viewer nodes. */
-static bool socket_can_be_viewed(const OutputSocketRef &socket)
+static bool socket_can_be_viewed(const bNodeSocket &socket)
 {
-  if (nodeSocketIsHidden(socket.bsocket())) {
+  if (nodeSocketIsHidden(&socket)) {
     return false;
   }
-  if (socket.idname() == "NodeSocketVirtual") {
+  if (STREQ(socket.idname, "NodeSocketVirtual")) {
     return false;
   }
-  if (socket.tree().btree()->type != NTREE_GEOMETRY) {
+  if (socket.owner_tree().type != NTREE_GEOMETRY) {
     return true;
   }
-  return ELEM(socket.typeinfo()->type,
+  return ELEM(socket.typeinfo->type,
               SOCK_GEOMETRY,
               SOCK_FLOAT,
               SOCK_VECTOR,
@@ -502,15 +490,15 @@ static bNodeSocket *node_link_viewer_get_socket(bNodeTree &ntree,
   return nullptr;
 }
 
-static bool is_viewer_node(const NodeRef &node)
+static bool is_viewer_node(const bNode &node)
 {
-  return ELEM(node.bnode()->type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER, GEO_NODE_VIEWER);
+  return ELEM(node.type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER, GEO_NODE_VIEWER);
 }
 
-static Vector<const NodeRef *> find_viewer_nodes(const NodeTreeRef &tree)
+static Vector<const bNode *> find_viewer_nodes(const bNodeTree &tree)
 {
-  Vector<const NodeRef *> viewer_nodes;
-  for (const NodeRef *node : tree.nodes()) {
+  Vector<const bNode *> viewer_nodes;
+  for (const bNode *node : tree.all_nodes()) {
     if (is_viewer_node(*node)) {
       viewer_nodes.append(node);
     }
@@ -518,20 +506,20 @@ static Vector<const NodeRef *> find_viewer_nodes(const NodeTreeRef &tree)
   return viewer_nodes;
 }
 
-static bool is_viewer_socket_in_viewer(const InputSocketRef &socket)
+static bool is_viewer_socket_in_viewer(const bNodeSocket &socket)
 {
-  const NodeRef &node = socket.node();
+  const bNode &node = socket.owner_node();
   BLI_assert(is_viewer_node(node));
-  if (node.typeinfo()->type == GEO_NODE_VIEWER) {
+  if (node.typeinfo->type == GEO_NODE_VIEWER) {
     return true;
   }
   return socket.index() == 0;
 }
 
-static bool is_linked_to_viewer(const OutputSocketRef &socket, const NodeRef &viewer_node)
+static bool is_linked_to_viewer(const bNodeSocket &socket, const bNode &viewer_node)
 {
-  for (const InputSocketRef *target_socket : socket.directly_linked_sockets()) {
-    if (&target_socket->node() != &viewer_node) {
+  for (const bNodeSocket *target_socket : socket.directly_linked_sockets()) {
+    if (&target_socket->owner_node() != &viewer_node) {
       continue;
     }
     if (!target_socket->is_available()) {
@@ -561,39 +549,39 @@ static void remove_links_to_unavailable_viewer_sockets(bNodeTree &btree, bNode &
   }
 }
 
-static const NodeRef *get_existing_viewer(const NodeTreeRef &tree)
+static const bNode *get_existing_viewer(const bNodeTree &tree)
 {
-  Vector<const NodeRef *> viewer_nodes = find_viewer_nodes(tree);
+  Vector<const bNode *> viewer_nodes = find_viewer_nodes(tree);
 
   /* Check if there is already an active viewer node that should be used. */
-  for (const NodeRef *viewer_node : viewer_nodes) {
-    if (viewer_node->bnode()->flag & NODE_DO_OUTPUT) {
+  for (const bNode *viewer_node : viewer_nodes) {
+    if (viewer_node->flag & NODE_DO_OUTPUT) {
       return viewer_node;
     }
   }
 
   /* If no active but non-active viewers exist, make one active. */
   if (!viewer_nodes.is_empty()) {
-    viewer_nodes[0]->bnode()->flag |= NODE_DO_OUTPUT;
+    const_cast<bNode *>(viewer_nodes[0])->flag |= NODE_DO_OUTPUT;
     return viewer_nodes[0];
   }
   return nullptr;
 }
 
-static const OutputSocketRef *find_output_socket_to_be_viewed(const NodeRef *active_viewer_node,
-                                                              const NodeRef &node_to_view)
+static const bNodeSocket *find_output_socket_to_be_viewed(const bNode *active_viewer_node,
+                                                          const bNode &node_to_view)
 {
   /* Check if any of the output sockets is selected, which is the case when the user just clicked
    * on the socket. */
-  for (const OutputSocketRef *output_socket : node_to_view.outputs()) {
-    if (output_socket->bsocket()->flag & SELECT) {
+  for (const bNodeSocket *output_socket : node_to_view.output_sockets()) {
+    if (output_socket->flag & SELECT) {
       return output_socket;
     }
   }
 
-  const OutputSocketRef *last_socket_linked_to_viewer = nullptr;
+  const bNodeSocket *last_socket_linked_to_viewer = nullptr;
   if (active_viewer_node != nullptr) {
-    for (const OutputSocketRef *output_socket : node_to_view.outputs()) {
+    for (const bNodeSocket *output_socket : node_to_view.output_sockets()) {
       if (!socket_can_be_viewed(*output_socket)) {
         continue;
       }
@@ -604,7 +592,7 @@ static const OutputSocketRef *find_output_socket_to_be_viewed(const NodeRef *act
   }
   if (last_socket_linked_to_viewer == nullptr) {
     /* If no output is connected to a viewer, use the first output that can be viewed. */
-    for (const OutputSocketRef *output_socket : node_to_view.outputs()) {
+    for (const bNodeSocket *output_socket : node_to_view.output_sockets()) {
       if (socket_can_be_viewed(*output_socket)) {
         return output_socket;
       }
@@ -612,10 +600,10 @@ static const OutputSocketRef *find_output_socket_to_be_viewed(const NodeRef *act
   }
   else {
     /* Pick the next socket to be linked to the viewer. */
-    const int tot_outputs = node_to_view.outputs().size();
+    const int tot_outputs = node_to_view.output_sockets().size();
     for (const int offset : IndexRange(1, tot_outputs - 1)) {
       const int index = (last_socket_linked_to_viewer->index() + offset) % tot_outputs;
-      const OutputSocketRef &output_socket = node_to_view.output(index);
+      const bNodeSocket &output_socket = node_to_view.output_socket(index);
       if (!socket_can_be_viewed(output_socket)) {
         continue;
       }
@@ -639,8 +627,9 @@ static int link_socket_to_viewer(const bContext &C,
   if (viewer_bnode == nullptr) {
     /* Create a new viewer node if none exists. */
     const int viewer_type = get_default_viewer_type(&C);
-    viewer_bnode = node_add_node(
-        C, nullptr, viewer_type, bsocket_to_view.locx + 100, bsocket_to_view.locy);
+    const float2 location{bsocket_to_view.locx / UI_DPI_FAC + 100,
+                          bsocket_to_view.locy / UI_DPI_FAC};
+    viewer_bnode = add_static_node(C, viewer_type, location);
     if (viewer_bnode == nullptr) {
       return OPERATOR_CANCELLED;
     }
@@ -682,20 +671,15 @@ static int node_link_viewer(const bContext &C, bNode &bnode_to_view)
 {
   SpaceNode &snode = *CTX_wm_space_node(&C);
   bNodeTree *btree = snode.edittree;
+  btree->ensure_topology_cache();
 
-  const NodeTreeRef tree{btree};
-  const NodeRef &node_to_view = *tree.find_node(bnode_to_view);
-  const NodeRef *active_viewer_node = get_existing_viewer(tree);
-
-  const OutputSocketRef *socket_to_view = find_output_socket_to_be_viewed(active_viewer_node,
-                                                                          node_to_view);
-  if (socket_to_view == nullptr) {
+  bNode *active_viewer_bnode = const_cast<bNode *>(get_existing_viewer(*btree));
+  bNodeSocket *bsocket_to_view = const_cast<bNodeSocket *>(
+      find_output_socket_to_be_viewed(active_viewer_bnode, bnode_to_view));
+  if (bsocket_to_view == nullptr) {
     return OPERATOR_FINISHED;
   }
-
-  bNodeSocket &bsocket_to_view = *socket_to_view->bsocket();
-  bNode *viewer_bnode = active_viewer_node ? active_viewer_node->bnode() : nullptr;
-  return link_socket_to_viewer(C, viewer_bnode, bnode_to_view, bsocket_to_view);
+  return link_socket_to_viewer(C, active_viewer_bnode, bnode_to_view, *bsocket_to_view);
 }
 
 /** \} */
@@ -949,6 +933,7 @@ static void node_link_find_socket(bContext &C, wmOperator &op, const float2 &cur
   if (nldrag->in_out == SOCK_OUT) {
     bNode *tnode;
     bNodeSocket *tsock = nullptr;
+    snode.edittree->ensure_topology_cache();
     if (node_find_indicated_socket(snode, &tnode, &tsock, cursor, SOCK_IN)) {
       for (bNodeLink *link : nldrag->links) {
         /* skip if socket is on the same node as the fromsock */
@@ -975,19 +960,19 @@ static void node_link_find_socket(bContext &C, wmOperator &op, const float2 &cur
           continue;
         }
         if (link->tosock && link->tosock->flag & SOCK_MULTI_INPUT) {
-          sort_multi_input_socket_links(snode, *tnode, link, &cursor);
+          sort_multi_input_socket_links_with_drag(*tnode, *link, cursor);
         }
       }
     }
     else {
       for (bNodeLink *link : nldrag->links) {
-        if (nldrag->last_node_hovered_while_dragging_a_link) {
-          sort_multi_input_socket_links(
-              snode, *nldrag->last_node_hovered_while_dragging_a_link, nullptr, &cursor);
-        }
         link->tonode = nullptr;
         link->tosock = nullptr;
       }
+      if (nldrag->last_node_hovered_while_dragging_a_link) {
+        update_multi_input_indices_for_removed_links(
+            *nldrag->last_node_hovered_while_dragging_a_link);
+      }
     }
   }
   else {
@@ -1184,7 +1169,7 @@ static int node_link_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 
   bool detach = RNA_boolean_get(op->ptr, "detach");
 
-  int mval[2];
+  int2 mval;
   WM_event_drag_start_mval(event, &region, mval);
 
   float2 cursor;
@@ -1324,28 +1309,6 @@ void NODE_OT_link_make(wmOperatorType *ot)
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Node Link Intersect
- * \{ */
-
-static bool node_links_intersect(bNodeLink &link, const float mcoords[][2], int tot)
-{
-  float coord_array[NODE_LINK_RESOL + 1][2];
-
-  if (node_link_bezier_points(nullptr, nullptr, link, coord_array, NODE_LINK_RESOL)) {
-    for (int i = 0; i < tot - 1; i++) {
-      for (int b = 0; b < NODE_LINK_RESOL; b++) {
-        if (isect_seg_seg_v2(mcoords[i], mcoords[i + 1], coord_array[b], coord_array[b + 1]) > 0) {
-          return true;
-        }
-      }
-    }
-  }
-  return false;
-}
-
-/** \} */
-
-/* -------------------------------------------------------------------- */
 /** \name Cut Link Operator
  * \{ */
 
@@ -1353,56 +1316,63 @@ static int cut_links_exec(bContext *C, wmOperator *op)
 {
   Main &bmain = *CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
-  ARegion &region = *CTX_wm_region(C);
+  const ARegion &region = *CTX_wm_region(C);
 
-  int i = 0;
-  float mcoords[256][2];
+  Vector<float2> path;
   RNA_BEGIN (op->ptr, itemptr, "path") {
-    float loc[2];
-
-    RNA_float_get_array(&itemptr, "loc", loc);
-    UI_view2d_region_to_view(
-        &region.v2d, (int)loc[0], (int)loc[1], &mcoords[i][0], &mcoords[i][1]);
-    i++;
-    if (i >= 256) {
+    float2 loc_region;
+    RNA_float_get_array(&itemptr, "loc", loc_region);
+    float2 loc_view;
+    UI_view2d_region_to_view(&region.v2d, loc_region.x, loc_region.y, &loc_view.x, &loc_view.y);
+    path.append(loc_view);
+    if (path.size() >= 256) {
       break;
     }
   }
   RNA_END;
 
-  if (i > 1) {
-    bool found = false;
+  if (path.is_empty()) {
+    return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
+  }
 
-    ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
+  bool found = false;
 
-    LISTBASE_FOREACH_MUTABLE (bNodeLink *, link, &snode.edittree->links) {
-      if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
-        continue;
-      }
+  ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
 
-      if (node_links_intersect(*link, mcoords, i)) {
+  bNodeTree &node_tree = *snode.edittree;
 
-        if (found == false) {
-          /* TODO(sergey): Why did we kill jobs twice? */
-          ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
-          found = true;
-        }
+  Set<bNode *> affected_nodes;
 
-        bNode *to_node = link->tonode;
-        nodeRemLink(snode.edittree, link);
-        sort_multi_input_socket_links(snode, *to_node, nullptr, nullptr);
-      }
+  LISTBASE_FOREACH_MUTABLE (bNodeLink *, link, &node_tree.links) {
+    if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
+      continue;
     }
 
-    ED_node_tree_propagate_change(C, CTX_data_main(C), snode.edittree);
-    if (found) {
-      return OPERATOR_FINISHED;
+    if (link_path_intersection(*link, path)) {
+
+      if (!found) {
+        /* TODO(sergey): Why did we kill jobs twice? */
+        ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
+        found = true;
+      }
+
+      bNode *to_node = link->tonode;
+      nodeRemLink(snode.edittree, link);
+      affected_nodes.add(to_node);
     }
+  }
 
-    return OPERATOR_CANCELLED;
+  node_tree.ensure_topology_cache();
+  for (bNode *node : affected_nodes) {
+    update_multi_input_indices_for_removed_links(*node);
   }
 
-  return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
+  ED_node_tree_propagate_change(C, CTX_data_main(C), snode.edittree);
+  if (found) {
+    return OPERATOR_FINISHED;
+  }
+
+  return OPERATOR_CANCELLED;
 }
 
 void NODE_OT_links_cut(wmOperatorType *ot)
@@ -1436,69 +1406,99 @@ void NODE_OT_links_cut(wmOperatorType *ot)
 /** \name Mute Links Operator
  * \{ */
 
+static bool all_links_muted(const bNodeSocket &socket)
+{
+  for (const bNodeLink *link : socket.directly_linked_links()) {
+    if (!(link->flag & NODE_LINK_MUTED)) {
+      return false;
+    }
+  }
+  return true;
+}
+
 static int mute_links_exec(bContext *C, wmOperator *op)
 {
   Main &bmain = *CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
-  ARegion &region = *CTX_wm_region(C);
+  const ARegion &region = *CTX_wm_region(C);
+  bNodeTree &ntree = *snode.edittree;
 
-  int i = 0;
-  float mcoords[256][2];
+  Vector<float2> path;
   RNA_BEGIN (op->ptr, itemptr, "path") {
-    float loc[2];
-
-    RNA_float_get_array(&itemptr, "loc", loc);
-    UI_view2d_region_to_view(
-        &region.v2d, (int)loc[0], (int)loc[1], &mcoords[i][0], &mcoords[i][1]);
-    i++;
-    if (i >= 256) {
+    float2 loc_region;
+    RNA_float_get_array(&itemptr, "loc", loc_region);
+    float2 loc_view;
+    UI_view2d_region_to_view(&region.v2d, loc_region.x, loc_region.y, &loc_view.x, &loc_view.y);
+    path.append(loc_view);
+    if (path.size() >= 256) {
       break;
     }
   }
   RNA_END;
 
-  if (i > 1) {
-    ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
+  if (path.is_empty()) {
+    return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
+  }
 
-    /* Count intersected links and clear test flag. */
-    int tot = 0;
-    LISTBASE_FOREACH (bNodeLink *, link, &snode.edittree->links) {
-      if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
-        continue;
-      }
-      link->flag &= ~NODE_LINK_TEST;
-      if (node_links_intersect(*link, mcoords, i)) {
-        tot++;
-      }
+  ED_preview_kill_jobs(CTX_wm_manager(C), &bmain);
+
+  ntree.ensure_topology_cache();
+
+  Set<bNodeLink *> affected_links;
+  LISTBASE_FOREACH (bNodeLink *, link, &ntree.links) {
+    if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
+      continue;
     }
-    if (tot == 0) {
-      return OPERATOR_CANCELLED;
+    if (!link_path_intersection(*link, path)) {
+      continue;
     }
+    affected_links.add(link);
+  }
 
-    /* Mute links. */
-    LISTBASE_FOREACH (bNodeLink *, link, &snode.edittree->links) {
-      if (node_link_is_hidden_or_dimmed(region.v2d, *link) || (link->flag & NODE_LINK_TEST)) {
-        continue;
-      }
+  if (affected_links.is_empty()) {
+    return OPERATOR_CANCELLED;
+  }
+
+  bke::node_tree_runtime::AllowUsingOutdatedInfo allow_outdated_info{ntree};
+
+  for (bNodeLink *link : affected_links) {
+    nodeLinkSetMute(&ntree, link, !(link->flag & NODE_LINK_MUTED));
+    const bool muted = link->flag & NODE_LINK_MUTED;
 
-      if (node_links_intersect(*link, mcoords, i)) {
-        nodeMuteLinkToggle(snode.edittree, link);
+    /* Propagate mute status downstream past reroute nodes. */
+    if (link->tonode->is_reroute()) {
+      Stack<bNodeLink *> links;
+      links.push_multiple(link->tonode->output_sockets().first()->directly_linked_links());
+      while (!links.is_empty()) {
+        bNodeLink *link = links.pop();
+        nodeLinkSetMute(&ntree, link, muted);
+        if (!link->tonode->is_reroute()) {
+          continue;
+        }
+        links.push_multiple(link->tonode->output_sockets().first()->directly_linked_links());
       }
     }
-
-    /* Clear remaining test flags. */
-    LISTBASE_FOREACH (bNodeLink *, link, &snode.edittree->links) {
-      if (node_link_is_hidden_or_dimmed(region.v2d, *link)) {
-        continue;
+    /* Propagate mute status upstream past reroutes, but only if all outputs are muted. */
+    if (link->fromnode->is_reroute()) {
+      if (!muted || all_links_muted(*link->fromsock)) {
+        Stack<bNodeLink *> links;
+        links.push_multiple(link->fromnode->input_sockets().first()->directly_linked_links());
+        while (!links.is_empty()) {
+          bNodeLink *link = links.pop();
+          nodeLinkSetMute(&ntree, link, muted);
+          if (!link->fromnode->is_reroute()) {
+            continue;
+          }
+          if (!muted || all_links_muted(*link->fromsock)) {
+            links.push_multiple(link->fromnode->input_sockets().first()->directly_linked_links());
+          }
+        }
       }
-      link->flag &= ~NODE_LINK_TEST;
     }
-
-    ED_node_tree_propagate_change(C, CTX_data_main(C), snode.edittree);
-    return OPERATOR_FINISHED;
   }
 
-  return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
+  ED_node_tree_propagate_change(C, CTX_data_main(C), &ntree);
+  return OPERATOR_FINISHED;
 }
 
 void NODE_OT_links_mute(wmOperatorType *ot)
@@ -1619,7 +1619,9 @@ void NODE_OT_parent_set(wmOperatorType *ot)
 #define NODE_JOIN_DONE 1
 #define NODE_JOIN_IS_DESCENDANT 2
 
-static void node_join_attach_recursive(bNode *node, bNode *frame)
+static void node_join_attach_recursive(bNode *node,
+                                       bNode *frame,
+                                       const Set<bNode *> &selected_nodes)
 {
   node->done |= NODE_JOIN_DONE;
 
@@ -1629,21 +1631,21 @@ static void node_join_attach_recursive(bNode *node, bNode *frame)
   else if (node->parent) {
     /* call recursively */
     if (!(node->parent->done & NODE_JOIN_DONE)) {
-      node_join_attach_recursive(node->parent, frame);
+      node_join_attach_recursive(node->parent, frame, selected_nodes);
     }
 
     /* in any case: if the parent is a descendant, so is the child */
     if (node->parent->done & NODE_JOIN_IS_DESCENDANT) {
       node->done |= NODE_JOIN_IS_DESCENDANT;
     }
-    else if (node->flag & NODE_TEST) {
+    else if (selected_nodes.contains(node)) {
       /* if parent is not an descendant of the frame, reattach the node */
       nodeDetachNode(node);
       nodeAttachNode(node, frame);
       node->done |= NODE_JOIN_IS_DESCENDANT;
     }
   }
-  else if (node->flag & NODE_TEST) {
+  else if (selected_nodes.contains(node)) {
     nodeAttachNode(node, frame);
     node->done |= NODE_JOIN_IS_DESCENDANT;
   }
@@ -1651,21 +1653,13 @@ static void node_join_attach_recursive(bNode *node, bNode *frame)
 
 static int node_join_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  Main &bmain = *CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
   bNodeTree &ntree = *snode.edittree;
 
-  /* XXX save selection: node_add_node call below sets the new frame as single
-   * active+selected node */
-  LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
-    if (node->flag & NODE_SELECT) {
-      node->flag |= NODE_TEST;
-    }
-    else {
-      node->flag &= ~NODE_TEST;
-    }
-  }
+  const Set<bNode *> selected_nodes = get_selected_nodes(ntree);
 
-  bNode *frame = node_add_node(*C, nullptr, NODE_FRAME, 0.0f, 0.0f);
+  bNode *frame_node = nodeAddStaticNode(C, &ntree, NODE_FRAME);
 
   /* reset tags */
   LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
@@ -1674,18 +1668,12 @@ static int node_join_exec(bContext *C, wmOperator *UNUSED(op))
 
   LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
     if (!(node->done & NODE_JOIN_DONE)) {
-      node_join_attach_recursive(node, frame);
-    }
-  }
-
-  /* restore selection */
-  LISTBASE_FOREACH (bNode *, node, &ntree.nodes) {
-    if (node->flag & NODE_TEST) {
-      node->flag |= NODE_SELECT;
+      node_join_attach_recursive(node, frame_node, selected_nodes);
     }
   }
 
   node_sort(ntree);
+  ED_node_tree_propagate_change(C, &bmain, snode.edittree);
   WM_event_add_notifier(C, NC_NODE | ND_DISPLAY, nullptr);
 
   return OPERATOR_FINISHED;
@@ -1714,11 +1702,11 @@ void NODE_OT_join(wmOperatorType *ot)
 
 static bNode *node_find_frame_to_attach(ARegion &region,
                                         const bNodeTree &ntree,
-                                        const int mouse_xy[2])
+                                        const int2 mouse_xy)
 {
   /* convert mouse coordinates to v2d space */
-  float cursor[2];
-  UI_view2d_region_to_view(&region.v2d, UNPACK2(mouse_xy), &cursor[0], &cursor[1]);
+  float2 cursor;
+  UI_view2d_region_to_view(&region.v2d, mouse_xy.x, mouse_xy.y, &cursor.x, &cursor.y);
 
   LISTBASE_FOREACH_BACKWARD (bNode *, frame, &ntree.nodes) {
     /* skip selected, those are the nodes we want to attach */
@@ -1739,32 +1727,34 @@ static int node_attach_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent
   SpaceNode &snode = *CTX_wm_space_node(C);
   bNodeTree &ntree = *snode.edittree;
   bNode *frame = node_find_frame_to_attach(region, ntree, event->mval);
+  if (frame == nullptr) {
+    /* Return "finished" so that auto offset operator macros can work. */
+    return OPERATOR_FINISHED;
+  }
 
-  if (frame) {
-    LISTBASE_FOREACH_BACKWARD (bNode *, node, &ntree.nodes) {
-      if (node->flag & NODE_SELECT) {
-        if (node->parent == nullptr) {
-          /* disallow moving a parent into its child */
-          if (nodeAttachNodeCheck(frame, node) == false) {
-            /* attach all unparented nodes */
-            nodeAttachNode(node, frame);
-          }
+  LISTBASE_FOREACH_BACKWARD (bNode *, node, &ntree.nodes) {
+    if (node->flag & NODE_SELECT) {
+      if (node->parent == nullptr) {
+        /* disallow moving a parent into its child */
+        if (nodeAttachNodeCheck(frame, node) == false) {
+          /* attach all unparented nodes */
+          nodeAttachNode(node, frame);
         }
-        else {
-          /* attach nodes which share parent with the frame */
-          bNode *parent;
-          for (parent = frame->parent; parent; parent = parent->parent) {
-            if (parent == node->parent) {
-              break;
-            }
+      }
+      else {
+        /* attach nodes which share parent with the frame */
+        bNode *parent;
+        for (parent = frame->parent; parent; parent = parent->parent) {
+          if (parent == node->parent) {
+            break;
           }
+        }
 
-          if (parent) {
-            /* disallow moving a parent into its child */
-            if (nodeAttachNodeCheck(frame, node) == false) {
-              nodeDetachNode(node);
-              nodeAttachNode(node, frame);
-            }
+        if (parent) {
+          /* disallow moving a parent into its child */
+          if (nodeAttachNodeCheck(frame, node) == false) {
+            nodeDetachNode(node);
+            nodeAttachNode(node, frame);
           }
         }
       }
@@ -1942,6 +1932,7 @@ static bool ed_node_link_conditions(ScrArea *area,
 
 void ED_node_link_intersect_test(ScrArea *area, int test)
 {
+  using namespace blender;
   using namespace blender::ed::space_node;
 
   bNode *select;
@@ -1965,36 +1956,34 @@ void ED_node_link_intersect_test(ScrArea *area, int test)
   bNodeLink *selink = nullptr;
   float dist_best = FLT_MAX;
   LISTBASE_FOREACH (bNodeLink *, link, &snode->edittree->links) {
-    float coord_array[NODE_LINK_RESOL + 1][2];
 
     if (node_link_is_hidden_or_dimmed(region->v2d, *link)) {
       continue;
     }
 
-    if (node_link_bezier_points(nullptr, nullptr, *link, coord_array, NODE_LINK_RESOL)) {
-      float dist = FLT_MAX;
+    std::array<float2, NODE_LINK_RESOL + 1> coords;
+    node_link_bezier_points_evaluated(*link, coords);
+    float dist = FLT_MAX;
 
-      /* loop over link coords to find shortest dist to
-       * upper left node edge of a intersected line segment */
-      for (int i = 0; i < NODE_LINK_RESOL; i++) {
-        /* Check if the node rectangle intersects the line from this point to next one. */
-        if (BLI_rctf_isect_segment(&select->totr, coord_array[i], coord_array[i + 1])) {
-          /* store the shortest distance to the upper left edge
-           * of all intersections found so far */
-          const float node_xy[] = {select->totr.xmin, select->totr.ymax};
+    /* loop over link coords to find shortest dist to
+     * upper left node edge of a intersected line segment */
+    for (int i = 0; i < NODE_LINK_RESOL; i++) {
+      /* Check if the node rectangle intersects the line from this point to next one. */
+      if (BLI_rctf_isect_segment(&select->totr, coords[i], coords[i + 1])) {
+        /* store the shortest distance to the upper left edge
+         * of all intersections found so far */
+        const float node_xy[] = {select->totr.xmin, select->totr.ymax};
 
-          /* to be precise coord_array should be clipped by select->totr,
-           * but not done since there's no real noticeable difference */
-          dist = min_ff(
-              dist_squared_to_line_segment_v2(node_xy, coord_array[i], coord_array[i + 1]), dist);
-        }
+        /* to be precise coords should be clipped by select->totr,
+         * but not done since there's no real noticeable difference */
+        dist = min_ff(dist_squared_to_line_segment_v2(node_xy, coords[i], coords[i + 1]), dist);
       }
+    }
 
-      /* we want the link with the shortest distance to node center */
-      if (dist < dist_best) {
-        dist_best = dist;
-        selink = link;
-      }
+    /* we want the link with the shortest distance to node center */
+    if (dist < dist_best) {
+      dist_best = dist;
+      selink = link;
     }
   }
 
@@ -2048,7 +2037,7 @@ static bNodeSocket *get_main_socket(bNodeTree &ntree, bNode &node, eNodeSocketIn
 
   /* Try to get the main socket based on the socket declaration. */
   nodeDeclarationEnsure(&ntree, &node);
-  const nodes::NodeDeclaration *node_decl = node.runtime->declaration;
+  const nodes::NodeDeclaration *node_decl = node.declaration();
   if (node_decl != nullptr) {
     Span<nodes::SocketDeclarationPtr> socket_decls = (in_out == SOCK_IN) ? node_decl->inputs() :
                                                                            node_decl->outputs();
@@ -2323,10 +2312,10 @@ static void node_link_insert_offset_ntree(NodeInsertOfsData *iofsd,
 /**
  * Modal handler for insert offset animation
  */
-static int node_insert_offset_modal(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
+static int node_insert_offset_modal(bContext *C, wmOperator *op, const wmEvent *event)
 {
   SpaceNode *snode = CTX_wm_space_node(C);
-  NodeInsertOfsData *iofsd = snode->runtime->iofsd;
+  NodeInsertOfsData *iofsd = static_cast<NodeInsertOfsData *>(op->customdata);
   bool redraw = false;
 
   if (!snode || event->type != TIMER || iofsd == nullptr ||
@@ -2366,7 +2355,6 @@ static int node_insert_offset_modal(bContext *C, wmOperator *UNUSED(op), const w
       node->anim_init_locx = node->anim_ofsx = 0.0f;
     }
 
-    snode->runtime->iofsd = nullptr;
     MEM_freeN(iofsd);
 
     return (OPERATOR_FINISHED | OPERATOR_PASS_THROUGH);
@@ -2381,6 +2369,8 @@ static int node_insert_offset_invoke(bContext *C, wmOperator *op, const wmEvent
 {
   const SpaceNode *snode = CTX_wm_space_node(C);
   NodeInsertOfsData *iofsd = snode->runtime->iofsd;
+  snode->runtime->iofsd = nullptr;
+  op->customdata = iofsd;
 
   if (!iofsd || !iofsd->insert) {
     return OPERATOR_CANCELLED;
@@ -2487,6 +2477,7 @@ void ED_node_link_insert(Main *bmain, ScrArea *area)
 
   /* Set up insert offset data, it needs stuff from here. */
   if ((snode->flag & SNODE_SKIP_INSOFFSET) == 0) {
+    BLI_assert(snode->runtime->iofsd == nullptr);
     NodeInsertOfsData *iofsd = MEM_cnew<NodeInsertOfsData>(__func__);
 
     iofsd->insert = node_to_insert;
diff --git a/source/blender/editors/space_node/node_select.cc b/source/blender/editors/space_node/node_select.cc
index 9d73156edab..d93b205b1b7 100644
--- a/source/blender/editors/space_node/node_select.cc
+++ b/source/blender/editors/space_node/node_select.cc
@@ -22,6 +22,7 @@
 #include "BKE_context.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
+#include "BKE_node_runtime.hh"
 #include "BKE_workspace.h"
 
 #include "ED_node.h" /* own include */
@@ -48,7 +49,7 @@
 
 namespace blender::ed::space_node {
 
-static bool is_event_over_node_or_socket(bContext *C, const wmEvent *event);
+static bool is_event_over_node_or_socket(const bContext &C, const wmEvent &event);
 
 /**
  * Function to detect if there is a visible view3d that uses workbench in texture mode.
@@ -100,17 +101,17 @@ rctf node_frame_rect_inside(const bNode &node)
   return frame_inside;
 }
 
-bool node_or_socket_isect_event(bContext *C, const wmEvent *event)
+bool node_or_socket_isect_event(const bContext &C, const wmEvent &event)
 {
   return is_event_over_node_or_socket(C, event);
 }
 
-static bool node_frame_select_isect_mouse(bNode *node, const float2 &mouse)
+static bool node_frame_select_isect_mouse(const bNode &node, const float2 &mouse)
 {
   /* Frame nodes are selectable by their borders (including their whole rect - as for other nodes -
    * would prevent e.g. box selection of nodes inside that frame). */
-  const rctf frame_inside = node_frame_rect_inside(*node);
-  if (BLI_rctf_isect_pt(&node->totr, mouse.x, mouse.y) &&
+  const rctf frame_inside = node_frame_rect_inside(node);
+  if (BLI_rctf_isect_pt(&node.totr, mouse.x, mouse.y) &&
       !BLI_rctf_isect_pt(&frame_inside, mouse.x, mouse.y)) {
     return true;
   }
@@ -118,19 +119,18 @@ static bool node_frame_select_isect_mouse(bNode *node, const float2 &mouse)
   return false;
 }
 
-static bNode *node_under_mouse_select(bNodeTree &ntree, int mx, int my)
+static bNode *node_under_mouse_select(bNodeTree &ntree, const float2 mouse)
 {
   LISTBASE_FOREACH_BACKWARD (bNode *, node, &ntree.nodes) {
     switch (node->type) {
       case NODE_FRAME: {
-        const float2 mouse{(float)mx, (float)my};
-        if (node_frame_select_isect_mouse(node, mouse)) {
+        if (node_frame_select_isect_mouse(*node, mouse)) {
           return node;
         }
         break;
       }
       default: {
-        if (BLI_rctf_isect_pt(&node->totr, mx, my)) {
+        if (BLI_rctf_isect_pt(&node->totr, int(mouse.x), int(mouse.y))) {
           return node;
         }
         break;
@@ -140,35 +140,32 @@ static bNode *node_under_mouse_select(bNodeTree &ntree, int mx, int my)
   return nullptr;
 }
 
-static bNode *node_under_mouse_tweak(bNodeTree &ntree, const float2 &mouse)
+static bool node_under_mouse_tweak(const bNodeTree &ntree, const float2 &mouse)
 {
-  using namespace blender::math;
-
-  LISTBASE_FOREACH_BACKWARD (bNode *, node, &ntree.nodes) {
+  LISTBASE_FOREACH_BACKWARD (const bNode *, node, &ntree.nodes) {
     switch (node->type) {
       case NODE_REROUTE: {
-        bNodeSocket *socket = (bNodeSocket *)node->inputs.first;
-        const float2 location{socket->locx, socket->locy};
-        if (distance(mouse, location) < 24.0f) {
-          return node;
+        const float2 location = node_to_view(*node, {node->locx, node->locy});
+        if (math::distance(mouse, location) < 24.0f) {
+          return true;
         }
         break;
       }
       case NODE_FRAME: {
-        if (node_frame_select_isect_mouse(node, mouse)) {
-          return node;
+        if (node_frame_select_isect_mouse(*node, mouse)) {
+          return true;
         }
         break;
       }
       default: {
         if (BLI_rctf_isect_pt(&node->totr, mouse.x, mouse.y)) {
-          return node;
+          return true;
         }
         break;
       }
     }
   }
-  return nullptr;
+  return false;
 }
 
 static bool is_position_over_node_or_socket(SpaceNode &snode, const float2 &mouse)
@@ -187,17 +184,17 @@ static bool is_position_over_node_or_socket(SpaceNode &snode, const float2 &mous
   return false;
 }
 
-static bool is_event_over_node_or_socket(bContext *C, const wmEvent *event)
+static bool is_event_over_node_or_socket(const bContext &C, const wmEvent &event)
 {
-  SpaceNode *snode = CTX_wm_space_node(C);
-  ARegion *region = CTX_wm_region(C);
-  float2 mouse;
+  SpaceNode &snode = *CTX_wm_space_node(&C);
+  ARegion &region = *CTX_wm_region(&C);
 
-  int mval[2];
-  WM_event_drag_start_mval(event, region, mval);
+  int2 mval;
+  WM_event_drag_start_mval(&event, &region, mval);
 
-  UI_view2d_region_to_view(&region->v2d, mval[0], mval[1], &mouse.x, &mouse.y);
-  return is_position_over_node_or_socket(*snode, mouse);
+  float2 mouse;
+  UI_view2d_region_to_view(&region.v2d, mval.x, mval.y, &mouse.x, &mouse.y);
+  return is_position_over_node_or_socket(snode, mouse);
 }
 
 void node_socket_select(bNode *node, bNodeSocket &sock)
@@ -314,6 +311,17 @@ void node_deselect_all_output_sockets(SpaceNode &snode, const bool deselect_node
   }
 }
 
+Set<bNode *> get_selected_nodes(bNodeTree &node_tree)
+{
+  Set<bNode *> selected_nodes;
+  for (bNode *node : node_tree.all_nodes()) {
+    if (node->flag & NODE_SELECT) {
+      selected_nodes.add(node);
+    }
+  }
+  return selected_nodes;
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -412,9 +420,7 @@ static int node_select_grouped_exec(bContext *C, wmOperator *op)
   const int type = RNA_enum_get(op->ptr, "type");
 
   if (!extend) {
-    LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
-      nodeSetSelected(node, false);
-    }
+    node_deselect_all(snode);
   }
   nodeSetSelected(node_act, true);
 
@@ -514,8 +520,8 @@ void node_select_single(bContext &C, bNode &node)
 
 static bool node_mouse_select(bContext *C,
                               wmOperator *op,
-                              const int mval[2],
-                              struct SelectPick_Params *params)
+                              const int2 mval,
+                              SelectPick_Params *params)
 {
   Main &bmain = *CTX_data_main(C);
   SpaceNode &snode = *CTX_wm_space_node(C);
@@ -526,7 +532,6 @@ static bool node_mouse_select(bContext *C,
   bNode *node, *tnode;
   bNodeSocket *sock = nullptr;
   bNodeSocket *tsock;
-  float cursor[2];
 
   /* always do socket_select when extending selection. */
   const bool socket_select = (params->sel_op == SEL_OP_XOR) ||
@@ -536,7 +541,8 @@ static bool node_mouse_select(bContext *C,
   bool node_was_selected = false;
 
   /* get mouse coordinates in view2d space */
-  UI_view2d_region_to_view(&region.v2d, mval[0], mval[1], &cursor[0], &cursor[1]);
+  float2 cursor;
+  UI_view2d_region_to_view(&region.v2d, mval.x, mval.y, &cursor.x, &cursor.y);
 
   /* first do socket selection, these generally overlap with nodes. */
   if (socket_select) {
@@ -593,7 +599,7 @@ static bool node_mouse_select(bContext *C,
   if (!sock) {
 
     /* find the closest visible node */
-    node = node_under_mouse_select(*snode.edittree, (int)cursor[0], (int)cursor[1]);
+    node = node_under_mouse_select(*snode.edittree, cursor);
     found = (node != nullptr);
     node_was_selected = node && (node->flag & SELECT);
 
@@ -603,9 +609,7 @@ static bool node_mouse_select(bContext *C,
       }
       else if (found || params->deselect_all) {
         /* Deselect everything. */
-        for (tnode = (bNode *)snode.edittree->nodes.first; tnode; tnode = tnode->next) {
-          nodeSetSelected(tnode, false);
-        }
+        node_deselect_all(snode);
         changed = true;
       }
     }
@@ -640,37 +644,38 @@ static bool node_mouse_select(bContext *C,
     }
   }
 
-  /* update node order */
-  if (changed || found) {
-    bool active_texture_changed = false;
-    bool viewer_node_changed = false;
-    if ((node != nullptr) && (node_was_selected == false || params->select_passthrough == false)) {
-      viewer_node_changed = (node->flag & NODE_DO_OUTPUT) == 0 && node->type == GEO_NODE_VIEWER;
-      ED_node_set_active(&bmain, &snode, snode.edittree, node, &active_texture_changed);
-    }
-    else if (node != nullptr && node->type == GEO_NODE_VIEWER) {
-      ED_spreadsheet_context_paths_set_geometry_node(&bmain, &snode, node);
-    }
-    ED_node_set_active_viewer_key(&snode);
-    node_sort(*snode.edittree);
-    if ((active_texture_changed && has_workbench_in_texture_color(wm, scene, ob)) ||
-        viewer_node_changed) {
-      DEG_id_tag_update(&snode.edittree->id, ID_RECALC_COPY_ON_WRITE);
-    }
+  if (!(changed || found)) {
+    return false;
+  }
 
-    WM_event_add_notifier(C, NC_NODE | NA_SELECTED, nullptr);
+  bool active_texture_changed = false;
+  bool viewer_node_changed = false;
+  if ((node != nullptr) && (node_was_selected == false || params->select_passthrough == false)) {
+    viewer_node_changed = (node->flag & NODE_DO_OUTPUT) == 0 && node->type == GEO_NODE_VIEWER;
+    ED_node_set_active(&bmain, &snode, snode.edittree, node, &active_texture_changed);
+  }
+  else if (node != nullptr && node->type == GEO_NODE_VIEWER) {
+    ED_spreadsheet_context_paths_set_geometry_node(&bmain, &snode, node);
   }
+  ED_node_set_active_viewer_key(&snode);
+  node_sort(*snode.edittree);
+  if ((active_texture_changed && has_workbench_in_texture_color(wm, scene, ob)) ||
+      viewer_node_changed) {
+    DEG_id_tag_update(&snode.edittree->id, ID_RECALC_COPY_ON_WRITE);
+  }
+
+  WM_event_add_notifier(C, NC_NODE | NA_SELECTED, nullptr);
 
-  return changed || found;
+  return true;
 }
 
 static int node_select_exec(bContext *C, wmOperator *op)
 {
   /* get settings from RNA properties for operator */
-  int mval[2];
+  int2 mval;
   RNA_int_get_array(op->ptr, "location", mval);
 
-  struct SelectPick_Params params = {};
+  SelectPick_Params params = {};
   ED_select_pick_params_from_operator(op->ptr, &params);
 
   /* perform the select */
@@ -747,7 +752,7 @@ static int node_box_select_exec(bContext *C, wmOperator *op)
   const eSelectOp sel_op = (eSelectOp)RNA_enum_get(op->ptr, "mode");
   const bool select = (sel_op != SEL_OP_SUB);
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    node_select_all(&node_tree.nodes, SEL_DESELECT);
+    node_deselect_all(snode);
   }
 
   LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
@@ -787,7 +792,7 @@ static int node_box_select_invoke(bContext *C, wmOperator *op, const wmEvent *ev
 {
   const bool tweak = RNA_boolean_get(op->ptr, "tweak");
 
-  if (tweak && is_event_over_node_or_socket(C, event)) {
+  if (tweak && is_event_over_node_or_socket(*C, *event)) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
@@ -836,7 +841,7 @@ static int node_circleselect_exec(bContext *C, wmOperator *op)
   bNode *node;
 
   int x, y, radius;
-  float offset[2];
+  float2 offset;
 
   float zoom = (float)(BLI_rcti_size_x(&region->winrct)) /
                (float)(BLI_rctf_size_x(&region->v2d.cur));
@@ -846,7 +851,7 @@ static int node_circleselect_exec(bContext *C, wmOperator *op)
       WM_gesture_is_modal_first((const wmGesture *)op->customdata));
   const bool select = (sel_op != SEL_OP_SUB);
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    node_select_all(&snode->edittree->nodes, SEL_DESELECT);
+    node_deselect_all(*snode);
   }
 
   /* get operator properties */
@@ -854,7 +859,7 @@ static int node_circleselect_exec(bContext *C, wmOperator *op)
   y = RNA_int_get(op->ptr, "y");
   radius = RNA_int_get(op->ptr, "radius");
 
-  UI_view2d_region_to_view(&region->v2d, x, y, &offset[0], &offset[1]);
+  UI_view2d_region_to_view(&region->v2d, x, y, &offset.x, &offset.y);
 
   for (node = (bNode *)snode->edittree->nodes.first; node; node = node->next) {
     switch (node->type) {
@@ -916,7 +921,7 @@ static int node_lasso_select_invoke(bContext *C, wmOperator *op, const wmEvent *
 {
   const bool tweak = RNA_boolean_get(op->ptr, "tweak");
 
-  if (tweak && is_event_over_node_or_socket(C, event)) {
+  if (tweak && is_event_over_node_or_socket(*C, *event)) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
@@ -938,7 +943,7 @@ static bool do_lasso_select_node(bContext *C,
 
   const bool select = (sel_op != SEL_OP_SUB);
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    node_select_all(&snode->edittree->nodes, SEL_DESELECT);
+    node_deselect_all(*snode);
     changed = true;
   }
 
@@ -968,14 +973,14 @@ static bool do_lasso_select_node(bContext *C,
         break;
       }
       default: {
-        int screen_co[2];
-        const float cent[2] = {BLI_rctf_cent_x(&node->totr), BLI_rctf_cent_y(&node->totr)};
+        int2 screen_co;
+        const float2 center = {BLI_rctf_cent_x(&node->totr), BLI_rctf_cent_y(&node->totr)};
 
         /* marker in screen coords */
         if (UI_view2d_view_to_region_clip(
-                &region->v2d, cent[0], cent[1], &screen_co[0], &screen_co[1]) &&
-            BLI_rcti_isect_pt(&rect, screen_co[0], screen_co[1]) &&
-            BLI_lasso_is_point_inside(mcoords, mcoords_len, screen_co[0], screen_co[1], INT_MAX)) {
+                &region->v2d, center.x, center.y, &screen_co.x, &screen_co.y) &&
+            BLI_rcti_isect_pt(&rect, screen_co.x, screen_co.y) &&
+            BLI_lasso_is_point_inside(mcoords, mcoords_len, screen_co.x, screen_co.y, INT_MAX)) {
           nodeSetSelected(node, select);
           changed = true;
         }
@@ -1042,13 +1047,48 @@ void NODE_OT_select_lasso(wmOperatorType *ot)
 /** \name (De)select All Operator
  * \{ */
 
+static bool any_node_selected(const bNodeTree &node_tree)
+{
+  for (const bNode *node : node_tree.all_nodes()) {
+    if (node->flag & NODE_SELECT) {
+      return true;
+    }
+  }
+  return false;
+}
+
 static int node_select_all_exec(bContext *C, wmOperator *op)
 {
   SpaceNode &snode = *CTX_wm_space_node(C);
-  ListBase *node_lb = &snode.edittree->nodes;
+  bNodeTree &node_tree = *snode.edittree;
+
+  node_tree.ensure_topology_cache();
+
   int action = RNA_enum_get(op->ptr, "action");
+  if (action == SEL_TOGGLE) {
+    if (any_node_selected(node_tree)) {
+      action = SEL_DESELECT;
+    }
+    else {
+      action = SEL_SELECT;
+    }
+  }
 
-  node_select_all(node_lb, action);
+  switch (action) {
+    case SEL_SELECT:
+      for (bNode *node : node_tree.all_nodes()) {
+        nodeSetSelected(node, true);
+      }
+      break;
+    case SEL_DESELECT:
+      node_deselect_all(snode);
+      break;
+    case SEL_INVERT:
+      for (bNode *node : node_tree.all_nodes()) {
+        nodeSetSelected(node, !(node->flag & SELECT));
+      }
+      break;
+  }
 
   node_sort(*snode.edittree);
 
@@ -1084,22 +1124,21 @@ static int node_select_linked_to_exec(bContext *C, wmOperator *UNUSED(op))
   SpaceNode &snode = *CTX_wm_space_node(C);
   bNodeTree &node_tree = *snode.edittree;
 
-  LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
-    node->flag &= ~NODE_TEST;
-  }
+  node_tree.ensure_topology_cache();
 
-  LISTBASE_FOREACH (bNodeLink *, link, &node_tree.links) {
-    if (nodeLinkIsHidden(link)) {
-      continue;
-    }
-    if (link->fromnode && link->tonode && (link->fromnode->flag & NODE_SELECT)) {
-      link->tonode->flag |= NODE_TEST;
-    }
-  }
+  Set<bNode *> initial_selection = get_selected_nodes(node_tree);
 
-  LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
-    if (node->flag & NODE_TEST) {
-      nodeSetSelected(node, true);
+  for (bNode *node : initial_selection) {
+    for (bNodeSocket *output_socket : node->output_sockets()) {
+      if (!output_socket->is_available()) {
+        continue;
+      }
+      for (bNodeSocket *input_socket : output_socket->directly_linked_sockets()) {
+        if (!input_socket->is_available()) {
+          continue;
+        }
+        nodeSetSelected(&input_socket->owner_node(), true);
+      }
     }
   }
 
@@ -1135,22 +1174,21 @@ static int node_select_linked_from_exec(bContext *C, wmOperator *UNUSED(op))
   SpaceNode &snode = *CTX_wm_space_node(C);
   bNodeTree &node_tree = *snode.edittree;
 
-  LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
-    node->flag &= ~NODE_TEST;
-  }
+  node_tree.ensure_topology_cache();
 
-  LISTBASE_FOREACH (bNodeLink *, link, &node_tree.links) {
-    if (nodeLinkIsHidden(link)) {
-      continue;
-    }
-    if (link->fromnode && link->tonode && (link->tonode->flag & NODE_SELECT)) {
-      link->fromnode->flag |= NODE_TEST;
-    }
-  }
+  Set<bNode *> initial_selection = get_selected_nodes(node_tree);
 
-  LISTBASE_FOREACH (bNode *, node, &node_tree.nodes) {
-    if (node->flag & NODE_TEST) {
-      nodeSetSelected(node, true);
+  for (bNode *node : initial_selection) {
+    for (bNodeSocket *input_socket : node->input_sockets()) {
+      if (!input_socket->is_available()) {
+        continue;
+      }
+      for (bNodeSocket *output_socket : input_socket->directly_linked_sockets()) {
+        if (!output_socket->is_available()) {
+          continue;
+        }
+        nodeSetSelected(&output_socket->owner_node(), true);
+      }
     }
   }
 
@@ -1298,7 +1336,7 @@ static void node_find_create_label(const bNode *node, char *str, int maxlen)
 }
 
 /* Generic search invoke. */
-static void node_find_update_fn(const struct bContext *C,
+static void node_find_update_fn(const bContext *C,
                                 void *UNUSED(arg),
                                 const char *str,
                                 uiSearchItems *items,
@@ -1330,7 +1368,7 @@ static void node_find_update_fn(const struct bContext *C,
   BLI_string_search_free(search);
 }
 
-static void node_find_exec_fn(struct bContext *C, void *UNUSED(arg1), void *arg2)
+static void node_find_exec_fn(bContext *C, void *UNUSED(arg1), void *arg2)
 {
   SpaceNode *snode = CTX_wm_space_node(C);
   bNode *active = (bNode *)arg2;
diff --git a/source/blender/editors/space_node/node_templates.cc b/source/blender/editors/space_node/node_templates.cc
index 58a313c328e..5fc194e02a4 100644
--- a/source/blender/editors/space_node/node_templates.cc
+++ b/source/blender/editors/space_node/node_templates.cc
@@ -758,43 +758,42 @@ namespace blender::ed::space_node {
 /**************************** Node Tree Layout *******************************/
 
 static void ui_node_draw_input(
-    uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, bNodeSocket *input, int depth);
+    uiLayout &layout, bContext &C, bNodeTree &ntree, bNode &node, bNodeSocket &input, int depth);
 
 static void ui_node_draw_node(
-    uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, int depth)
+    uiLayout &layout, bContext &C, bNodeTree &ntree, bNode &node, int depth)
 {
-  bNodeSocket *input;
   PointerRNA nodeptr;
 
-  RNA_pointer_create(&ntree->id, &RNA_Node, node, &nodeptr);
+  RNA_pointer_create(&ntree.id, &RNA_Node, &node, &nodeptr);
 
-  if (node->typeinfo->draw_buttons) {
-    if (node->type != NODE_GROUP) {
-      uiLayoutSetPropSep(layout, true);
-      node->typeinfo->draw_buttons(layout, C, &nodeptr);
+  if (node.typeinfo->draw_buttons) {
+    if (node.type != NODE_GROUP) {
+      uiLayoutSetPropSep(&layout, true);
+      node.typeinfo->draw_buttons(&layout, &C, &nodeptr);
     }
   }
 
-  for (input = (bNodeSocket *)node->inputs.first; input; input = input->next) {
-    ui_node_draw_input(layout, C, ntree, node, input, depth + 1);
+  LISTBASE_FOREACH (bNodeSocket *, input, &node.inputs) {
+    ui_node_draw_input(layout, C, ntree, node, *input, depth + 1);
   }
 }
 
 static void ui_node_draw_input(
-    uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, bNodeSocket *input, int depth)
+    uiLayout &layout, bContext &C, bNodeTree &ntree, bNode &node, bNodeSocket &input, int depth)
 {
   PointerRNA inputptr, nodeptr;
-  uiBlock *block = uiLayoutGetBlock(layout);
+  uiBlock *block = uiLayoutGetBlock(&layout);
   uiLayout *row = nullptr;
   bool dependency_loop;
 
-  if (input->flag & SOCK_UNAVAIL) {
+  if (input.flag & SOCK_UNAVAIL) {
     return;
   }
 
   /* to avoid eternal loops on cyclic dependencies */
-  node->flag |= NODE_TEST;
-  bNode *lnode = (input->link) ? input->link->fromnode : nullptr;
+  node.flag |= NODE_TEST;
+  bNode *lnode = (input.link) ? input.link->fromnode : nullptr;
 
   dependency_loop = (lnode && (lnode->flag & NODE_TEST));
   if (dependency_loop) {
@@ -802,10 +801,10 @@ static void ui_node_draw_input(
   }
 
   /* socket RNA pointer */
-  RNA_pointer_create(&ntree->id, &RNA_NodeSocket, input, &inputptr);
-  RNA_pointer_create(&ntree->id, &RNA_Node, node, &nodeptr);
+  RNA_pointer_create(&ntree.id, &RNA_NodeSocket, &input, &inputptr);
+  RNA_pointer_create(&ntree.id, &RNA_Node, &node, &nodeptr);
 
-  row = uiLayoutRow(layout, true);
+  row = uiLayoutRow(&layout, true);
   /* Decorations are added manually here. */
   uiLayoutSetPropDecorate(row, false);
 
@@ -821,8 +820,8 @@ static void ui_node_draw_input(
 
       if (lnode &&
           (lnode->inputs.first || (lnode->typeinfo->draw_buttons && lnode->type != NODE_GROUP))) {
-        int icon = (input->flag & SOCK_COLLAPSED) ? ICON_DISCLOSURE_TRI_RIGHT :
-                                                    ICON_DISCLOSURE_TRI_DOWN;
+        int icon = (input.flag & SOCK_COLLAPSED) ? ICON_DISCLOSURE_TRI_RIGHT :
+                                                   ICON_DISCLOSURE_TRI_DOWN;
         uiItemR(sub, &inputptr, "show_expanded", UI_ITEM_R_ICON_ONLY, "", icon);
       }
 
@@ -831,7 +830,7 @@ static void ui_node_draw_input(
 
     sub = uiLayoutRow(sub, true);
     uiLayoutSetAlignment(sub, UI_LAYOUT_ALIGN_RIGHT);
-    uiItemL(sub, IFACE_(input->name), ICON_NONE);
+    uiItemL(sub, IFACE_(input.name), ICON_NONE);
   }
 
   if (dependency_loop) {
@@ -840,28 +839,28 @@ static void ui_node_draw_input(
   }
   else if (lnode) {
     /* input linked to a node */
-    uiTemplateNodeLink(row, C, ntree, node, input);
+    uiTemplateNodeLink(row, &C, &ntree, &node, &input);
     add_dummy_decorator = true;
 
-    if (depth == 0 || !(input->flag & SOCK_COLLAPSED)) {
+    if (depth == 0 || !(input.flag & SOCK_COLLAPSED)) {
       if (depth == 0) {
-        uiItemS(layout);
+        uiItemS(&layout);
       }
 
-      ui_node_draw_node(layout, C, ntree, lnode, depth);
+      ui_node_draw_node(layout, C, ntree, *lnode, depth);
     }
   }
   else {
     uiLayout *sub = uiLayoutRow(row, true);
 
-    uiTemplateNodeLink(sub, C, ntree, node, input);
+    uiTemplateNodeLink(sub, &C, &ntree, &node, &input);
 
-    if (input->flag & SOCK_HIDE_VALUE) {
+    if (input.flag & SOCK_HIDE_VALUE) {
       add_dummy_decorator = true;
     }
     /* input not linked, show value */
     else {
-      switch (input->type) {
+      switch (input.type) {
         case SOCK_VECTOR:
           uiItemS(sub);
           sub = uiLayoutColumn(sub, true);
@@ -876,11 +875,11 @@ static void ui_node_draw_input(
           break;
         case SOCK_STRING: {
           const bNodeTree *node_tree = (const bNodeTree *)nodeptr.owner_id;
-          SpaceNode *snode = CTX_wm_space_node(C);
+          SpaceNode *snode = CTX_wm_space_node(&C);
           if (node_tree->type == NTREE_GEOMETRY && snode != nullptr) {
             /* Only add the attribute search in the node editor, in other places there is not
              * enough context. */
-            node_geometry_add_attribute_search_button(*C, *node, inputptr, *sub);
+            node_geometry_add_attribute_search_button(C, node, inputptr, *sub);
           }
           else {
             uiItemR(sub, &inputptr, "default_value", 0, "", ICON_NONE);
@@ -899,10 +898,10 @@ static void ui_node_draw_input(
     uiItemDecoratorR(split_wrapper.decorate_column, nullptr, nullptr, 0);
   }
 
-  node_socket_add_tooltip(ntree, node, input, row);
+  node_socket_add_tooltip(ntree, node, input, *row);
 
   /* clear */
-  node->flag &= ~NODE_TEST;
+  node.flag &= ~NODE_TEST;
 }
 
 }  // namespace blender::ed::space_node
@@ -924,9 +923,9 @@ void uiTemplateNodeView(
   }
 
   if (input) {
-    ui_node_draw_input(layout, C, ntree, node, input, 0);
+    ui_node_draw_input(*layout, *C, *ntree, *node, *input, 0);
   }
   else {
-    ui_node_draw_node(layout, C, ntree, node, 0);
+    ui_node_draw_node(*layout, *C, *ntree, *node, 0);
   }
 }
diff --git a/source/blender/editors/space_node/node_view.cc b/source/blender/editors/space_node/node_view.cc
index 6f30632244b..33a75385022 100644
--- a/source/blender/editors/space_node/node_view.cc
+++ b/source/blender/editors/space_node/node_view.cc
@@ -177,7 +177,7 @@ void NODE_OT_view_selected(wmOperatorType *ot)
  * \{ */
 
 struct NodeViewMove {
-  int mvalo[2];
+  int2 mvalo;
   int xmin, ymin, xmax, ymax;
   /** Original Offset for cancel. */
   float xof_orig, yof_orig;
@@ -192,10 +192,10 @@ static int snode_bg_viewmove_modal(bContext *C, wmOperator *op, const wmEvent *e
   switch (event->type) {
     case MOUSEMOVE:
 
-      snode->xof -= (nvm->mvalo[0] - event->mval[0]);
-      snode->yof -= (nvm->mvalo[1] - event->mval[1]);
-      nvm->mvalo[0] = event->mval[0];
-      nvm->mvalo[1] = event->mval[1];
+      snode->xof -= (nvm->mvalo.x - event->mval[0]);
+      snode->yof -= (nvm->mvalo.y - event->mval[1]);
+      nvm->mvalo.x = event->mval[0];
+      nvm->mvalo.y = event->mval[1];
 
       /* prevent dragging image outside of the window and losing it! */
       CLAMP(snode->xof, nvm->xmin, nvm->xmax);
@@ -240,7 +240,7 @@ static int snode_bg_viewmove_invoke(bContext *C, wmOperator *op, const wmEvent *
   NodeViewMove *nvm;
   Image *ima;
   ImBuf *ibuf;
-  const float pad = 32.0f; /* better be bigger than scrollbars */
+  const float pad = 32.0f; /* Better be bigger than scroll-bars. */
 
   void *lock;
 
@@ -252,10 +252,10 @@ static int snode_bg_viewmove_invoke(bContext *C, wmOperator *op, const wmEvent *
     return OPERATOR_CANCELLED;
   }
 
-  nvm = MEM_cnew<NodeViewMove>("NodeViewMove struct");
+  nvm = MEM_cnew<NodeViewMove>(__func__);
   op->customdata = nvm;
-  nvm->mvalo[0] = event->mval[0];
-  nvm->mvalo[1] = event->mval[1];
+  nvm->mvalo.x = event->mval[0];
+  nvm->mvalo.y = event->mval[1];
 
   nvm->xmin = -(region->winx / 2) - (ibuf->x * (0.5f * snode->zoom)) + pad;
   nvm->xmax = (region->winx / 2) + (ibuf->x * (0.5f * snode->zoom)) - pad;
@@ -447,7 +447,7 @@ static void sample_draw(const bContext *C, ARegion *region, void *arg_info)
 }  // namespace blender::ed::space_node
 
 bool ED_space_node_get_position(
-    Main *bmain, SpaceNode *snode, struct ARegion *region, const int mval[2], float fpos[2])
+    Main *bmain, SpaceNode *snode, ARegion *region, const int mval[2], float fpos[2])
 {
   if (!ED_node_is_compositor(snode) || (snode->flag & SNODE_BACKDRAW) == 0) {
     return false;
@@ -645,7 +645,7 @@ static int sample_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 
   /* Don't handle events intended for nodes (which rely on click/drag distinction).
    * which this operator would use since sampling is normally activated on press, see: T98191. */
-  if (node_or_socket_isect_event(C, event)) {
+  if (node_or_socket_isect_event(*C, *event)) {
     return OPERATOR_PASS_THROUGH;
   }
 
diff --git a/source/blender/editors/space_node/space_node.cc b/source/blender/editors/space_node/space_node.cc
index 15afd024766..fae3eb1a143 100644
--- a/source/blender/editors/space_node/space_node.cc
+++ b/source/blender/editors/space_node/space_node.cc
@@ -302,7 +302,7 @@ static void node_free(SpaceLink *sl)
 }
 
 /* spacetype; init callback */
-static void node_init(struct wmWindowManager *UNUSED(wm), ScrArea *area)
+static void node_init(wmWindowManager *UNUSED(wm), ScrArea *area)
 {
   SpaceNode *snode = (SpaceNode *)area->spacedata.first;
 
@@ -362,7 +362,7 @@ static void node_area_tag_tree_recalc(SpaceNode *snode, ScrArea *area)
 static void node_area_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* NOTE: #ED_area_tag_refresh will re-execute compositor. */
   SpaceNode *snode = (SpaceNode *)area->spacedata.first;
@@ -511,7 +511,7 @@ static void node_area_listener(const wmSpaceTypeListenerParams *params)
   }
 }
 
-static void node_area_refresh(const struct bContext *C, ScrArea *area)
+static void node_area_refresh(const bContext *C, ScrArea *area)
 {
   /* default now: refresh node is starting preview */
   SpaceNode *snode = (SpaceNode *)area->spacedata.first;
@@ -526,7 +526,7 @@ static void node_area_refresh(const struct bContext *C, ScrArea *area)
         if (snode->runtime->recalc_auto_compositing) {
           snode->runtime->recalc_auto_compositing = false;
           snode->runtime->recalc_regular_compositing = false;
-          node_render_changed_exec((struct bContext *)C, nullptr);
+          node_render_changed_exec((bContext *)C, nullptr);
         }
         else if (snode->runtime->recalc_regular_compositing) {
           snode->runtime->recalc_regular_compositing = false;
@@ -753,7 +753,7 @@ static void node_header_region_draw(const bContext *C, ARegion *region)
 static void node_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   wmGizmoMap *gzmap = region->gizmo_map;
 
   /* context changes */
@@ -973,9 +973,7 @@ static void node_id_remap_cb(ID *old_id, ID *new_id, void *user_data)
   }
 }
 
-static void node_id_remap(ScrArea *UNUSED(area),
-                          SpaceLink *slink,
-                          const struct IDRemapper *mappings)
+static void node_id_remap(ScrArea *UNUSED(area), SpaceLink *slink, const IDRemapper *mappings)
 {
   /* Although we should be able to perform all the mappings in a single go this lead to issues when
    * running the python test cases. Somehow the nodetree/edittree weren't updated to the new
@@ -1023,7 +1021,7 @@ void ED_spacetype_node()
   ARegionType *art;
 
   st->spaceid = SPACE_NODE;
-  strncpy(st->name, "Node", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Node");
 
   st->create = node_create;
   st->free = node_free;
diff --git a/source/blender/editors/space_outliner/CMakeLists.txt b/source/blender/editors/space_outliner/CMakeLists.txt
index 97d2957eed2..d29028dad63 100644
--- a/source/blender/editors/space_outliner/CMakeLists.txt
+++ b/source/blender/editors/space_outliner/CMakeLists.txt
@@ -13,7 +13,6 @@ set(INC
   ../../sequencer
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -52,6 +51,7 @@ set(SRC
   tree/tree_element_id.cc
   tree/tree_element_id_library.cc
   tree/tree_element_id_scene.cc
+  tree/tree_element_label.cc
   tree/tree_element_nla.cc
   tree/tree_element_overrides.cc
   tree/tree_element_rna.cc
@@ -71,6 +71,7 @@ set(SRC
   tree/tree_element_id.hh
   tree/tree_element_id_library.hh
   tree/tree_element_id_scene.hh
+  tree/tree_element_label.hh
   tree/tree_element_nla.hh
   tree/tree_element_overrides.hh
   tree/tree_element_rna.hh
diff --git a/source/blender/editors/space_outliner/outliner_collections.cc b/source/blender/editors/space_outliner/outliner_collections.cc
index 8ca2ffe6a9c..48e7aa381ef 100644
--- a/source/blender/editors/space_outliner/outliner_collections.cc
+++ b/source/blender/editors/space_outliner/outliner_collections.cc
@@ -38,6 +38,8 @@
 
 #include "outliner_intern.hh" /* own include */
 
+namespace blender::ed::outliner {
+
 /* -------------------------------------------------------------------- */
 /** \name Utility API
  * \{ */
@@ -72,7 +74,7 @@ Collection *outliner_collection_from_tree_element(const TreeElement *te)
   }
 
   if (tselem->type == TSE_LAYER_COLLECTION) {
-    LayerCollection *lc = reinterpret_cast<LayerCollection *>(te->directdata);
+    LayerCollection *lc = static_cast<LayerCollection *>(te->directdata);
     return lc->collection;
   }
   if (ELEM(tselem->type, TSE_SCENE_COLLECTION_BASE, TSE_VIEW_COLLECTION_BASE)) {
@@ -86,9 +88,9 @@ Collection *outliner_collection_from_tree_element(const TreeElement *te)
   return nullptr;
 }
 
-TreeTraversalAction outliner_find_selected_collections(TreeElement *te, void *customdata)
+TreeTraversalAction outliner_collect_selected_collections(TreeElement *te, void *customdata)
 {
-  struct IDsSelectedData *data = reinterpret_cast<IDsSelectedData *>(customdata);
+  struct IDsSelectedData *data = static_cast<IDsSelectedData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (outliner_is_collection_tree_element(te)) {
@@ -103,9 +105,9 @@ TreeTraversalAction outliner_find_selected_collections(TreeElement *te, void *cu
   return TRAVERSE_CONTINUE;
 }
 
-TreeTraversalAction outliner_find_selected_objects(TreeElement *te, void *customdata)
+TreeTraversalAction outliner_collect_selected_objects(TreeElement *te, void *customdata)
 {
-  struct IDsSelectedData *data = reinterpret_cast<IDsSelectedData *>(customdata);
+  struct IDsSelectedData *data = static_cast<IDsSelectedData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (outliner_is_collection_tree_element(te)) {
@@ -122,15 +124,19 @@ TreeTraversalAction outliner_find_selected_objects(TreeElement *te, void *custom
   return TRAVERSE_CONTINUE;
 }
 
+}  // namespace blender::ed::outliner
+
 void ED_outliner_selected_objects_get(const bContext *C, ListBase *objects)
 {
+  using namespace blender::ed::outliner;
+
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
   struct IDsSelectedData data = {{nullptr}};
   outliner_tree_traverse(space_outliner,
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         outliner_find_selected_objects,
+                         outliner_collect_selected_objects,
                          &data);
   LISTBASE_FOREACH (LinkData *, link, &data.selected_array) {
     TreeElement *ten_selected = (TreeElement *)link->data;
@@ -140,12 +146,16 @@ void ED_outliner_selected_objects_get(const bContext *C, ListBase *objects)
   BLI_freelistN(&data.selected_array);
 }
 
+namespace blender::ed::outliner {
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
 /** \name Poll Functions
  * \{ */
 
+}  // namespace blender::ed::outliner
+
 bool ED_outliner_collections_editor_poll(bContext *C)
 {
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
@@ -153,6 +163,8 @@ bool ED_outliner_collections_editor_poll(bContext *C)
          ELEM(space_outliner->outlinevis, SO_VIEW_LAYER, SO_SCENES, SO_LIBRARIES);
 }
 
+namespace blender::ed::outliner {
+
 static bool outliner_view_layer_collections_editor_poll(bContext *C)
 {
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
@@ -184,7 +196,7 @@ struct CollectionNewData {
 
 static TreeTraversalAction collection_find_selected_to_add(TreeElement *te, void *customdata)
 {
-  struct CollectionNewData *data = reinterpret_cast<CollectionNewData *>(customdata);
+  struct CollectionNewData *data = static_cast<CollectionNewData *>(customdata);
   Collection *collection = outliner_collection_from_tree_element(te);
 
   if (!collection) {
@@ -284,9 +296,9 @@ struct CollectionEditData {
   bool is_liboverride_hierarchy_root_allowed;
 };
 
-static TreeTraversalAction collection_find_data_to_edit(TreeElement *te, void *customdata)
+static TreeTraversalAction collection_collect_data_to_edit(TreeElement *te, void *customdata)
 {
-  CollectionEditData *data = reinterpret_cast<CollectionEditData *>(customdata);
+  CollectionEditData *data = static_cast<CollectionEditData *>(customdata);
   Collection *collection = outliner_collection_from_tree_element(te);
 
   if (!collection) {
@@ -333,13 +345,17 @@ void outliner_collection_delete(
 
   /* We first walk over and find the Collections we actually want to delete
    * (ignoring duplicates). */
-  outliner_tree_traverse(
-      space_outliner, &space_outliner->tree, 0, TSE_SELECTED, collection_find_data_to_edit, &data);
+  outliner_tree_traverse(space_outliner,
+                         &space_outliner->tree,
+                         0,
+                         TSE_SELECTED,
+                         collection_collect_data_to_edit,
+                         &data);
 
   /* Effectively delete the collections. */
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    Collection *collection = reinterpret_cast<Collection *>(
+    Collection *collection = static_cast<Collection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
 
     /* Test in case collection got deleted as part of another one. */
@@ -361,10 +377,8 @@ void outliner_collection_delete(
             if (parent->flag & COLLECTION_IS_MASTER) {
               BLI_assert(parent->id.flag & LIB_EMBEDDED_DATA);
 
-              const IDTypeInfo *id_type = BKE_idtype_get_info_from_id(&parent->id);
-              BLI_assert(id_type->owner_get != nullptr);
-
-              ID *scene_owner = id_type->owner_get(bmain, &parent->id);
+              ID *scene_owner = BKE_id_owner_get(&parent->id);
+              BLI_assert(scene_owner != nullptr);
               BLI_assert(GS(scene_owner->name) == ID_SCE);
               if (ID_IS_LINKED(scene_owner) || ID_IS_OVERRIDE_LIBRARY(scene_owner)) {
                 skip = true;
@@ -397,7 +411,8 @@ static int collection_hierarchy_delete_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   struct wmMsgBus *mbus = CTX_wm_message_bus(C);
-  const Base *basact_prev = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Base *basact_prev = BKE_view_layer_active_base_get(view_layer);
 
   outliner_collection_delete(C, bmain, scene, op->reports, true);
 
@@ -406,7 +421,8 @@ static int collection_hierarchy_delete_exec(bContext *C, wmOperator *op)
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER, nullptr);
 
-  if (basact_prev != BASACT(view_layer)) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (basact_prev != BKE_view_layer_active_base_get(view_layer)) {
     WM_msg_publish_rna_prop(mbus, &scene->id, view_layer, LayerObjects, active);
   }
 
@@ -444,12 +460,12 @@ struct CollectionObjectsSelectData {
 static TreeTraversalAction outliner_find_first_selected_layer_collection(TreeElement *te,
                                                                          void *customdata)
 {
-  CollectionObjectsSelectData *data = reinterpret_cast<CollectionObjectsSelectData *>(customdata);
+  CollectionObjectsSelectData *data = static_cast<CollectionObjectsSelectData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   switch (tselem->type) {
     case TSE_LAYER_COLLECTION:
-      data->layer_collection = reinterpret_cast<LayerCollection *>(te->directdata);
+      data->layer_collection = static_cast<LayerCollection *>(te->directdata);
       return TRAVERSE_BREAK;
     case TSE_R_LAYER:
     case TSE_SCENE_COLLECTION_BASE:
@@ -477,6 +493,7 @@ static LayerCollection *outliner_active_layer_collection(bContext *C)
 
 static int collection_objects_select_exec(bContext *C, wmOperator *op)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   LayerCollection *layer_collection = outliner_active_layer_collection(C);
   bool deselect = STREQ(op->idname, "OUTLINER_OT_collection_objects_deselect");
@@ -485,9 +502,8 @@ static int collection_objects_select_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  BKE_layer_collection_objects_select(view_layer, layer_collection, deselect);
+  BKE_layer_collection_objects_select(scene, view_layer, layer_collection, deselect);
 
-  Scene *scene = CTX_data_scene(C);
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_main_add_notifier(NC_SCENE | ND_OB_SELECT, scene);
   ED_outliner_select_sync_from_object_tag(C);
@@ -538,7 +554,7 @@ struct CollectionDuplicateData {
 static TreeTraversalAction outliner_find_first_selected_collection(TreeElement *te,
                                                                    void *customdata)
 {
-  CollectionDuplicateData *data = reinterpret_cast<CollectionDuplicateData *>(customdata);
+  CollectionDuplicateData *data = static_cast<CollectionDuplicateData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   switch (tselem->type) {
@@ -594,10 +610,7 @@ static int collection_duplicate_exec(bContext *C, wmOperator *op)
   else if (parent != nullptr && (parent->flag & COLLECTION_IS_MASTER) != 0) {
     BLI_assert(parent->id.flag & LIB_EMBEDDED_DATA);
 
-    const IDTypeInfo *id_type = BKE_idtype_get_info_from_id(&parent->id);
-    BLI_assert(id_type->owner_get != nullptr);
-
-    Scene *scene_owner = (Scene *)id_type->owner_get(bmain, &parent->id);
+    Scene *scene_owner = reinterpret_cast<Scene *>(BKE_id_owner_get(&parent->id));
     BLI_assert(scene_owner != nullptr);
     BLI_assert(GS(scene_owner->id.name) == ID_SCE);
 
@@ -695,13 +708,17 @@ static int collection_link_exec(bContext *C, wmOperator *op)
   data.collections_to_edit = BLI_gset_ptr_new(__func__);
 
   /* We first walk over and find the Collections we actually want to link (ignoring duplicates). */
-  outliner_tree_traverse(
-      space_outliner, &space_outliner->tree, 0, TSE_SELECTED, collection_find_data_to_edit, &data);
+  outliner_tree_traverse(space_outliner,
+                         &space_outliner->tree,
+                         0,
+                         TSE_SELECTED,
+                         collection_collect_data_to_edit,
+                         &data);
 
   /* Effectively link the collections. */
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    Collection *collection = reinterpret_cast<Collection *>(
+    Collection *collection = static_cast<Collection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
     BKE_collection_child_add(bmain, active_collection, collection);
     id_fake_user_clear(&collection->id);
@@ -754,15 +771,19 @@ static int collection_instance_exec(bContext *C, wmOperator *UNUSED(op))
 
   /* We first walk over and find the Collections we actually want to instance
    * (ignoring duplicates). */
-  outliner_tree_traverse(
-      space_outliner, &space_outliner->tree, 0, TSE_SELECTED, collection_find_data_to_edit, &data);
+  outliner_tree_traverse(space_outliner,
+                         &space_outliner->tree,
+                         0,
+                         TSE_SELECTED,
+                         collection_collect_data_to_edit,
+                         &data);
 
   /* Find an active collection to add to, that doesn't give dependency cycles. */
   LayerCollection *active_lc = BKE_layer_collection_get_active(view_layer);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    Collection *collection = reinterpret_cast<Collection *>(
+    Collection *collection = static_cast<Collection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
 
     while (BKE_collection_cycle_find(active_lc->collection, collection)) {
@@ -772,7 +793,7 @@ static int collection_instance_exec(bContext *C, wmOperator *UNUSED(op))
 
   /* Effectively instance the collections. */
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    Collection *collection = reinterpret_cast<Collection *>(
+    Collection *collection = static_cast<Collection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
     Object *ob = ED_object_add_type(
         C, OB_EMPTY, collection->id.name + 2, scene->cursor.location, nullptr, false, 0);
@@ -812,16 +833,16 @@ void OUTLINER_OT_collection_instance(wmOperatorType *ot)
 /** \name Exclude Collection
  * \{ */
 
-static TreeTraversalAction layer_collection_find_data_to_edit(TreeElement *te, void *customdata)
+static TreeTraversalAction layer_collection_collect_data_to_edit(TreeElement *te, void *customdata)
 {
-  CollectionEditData *data = reinterpret_cast<CollectionEditData *>(customdata);
+  CollectionEditData *data = static_cast<CollectionEditData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (!(tselem && tselem->type == TSE_LAYER_COLLECTION)) {
     return TRAVERSE_CONTINUE;
   }
 
-  LayerCollection *lc = reinterpret_cast<LayerCollection *>(te->directdata);
+  LayerCollection *lc = static_cast<LayerCollection *>(te->directdata);
 
   if (lc->collection->flag & COLLECTION_IS_MASTER) {
     /* skip - showing warning/error message might be misleading
@@ -857,12 +878,12 @@ static bool collections_view_layer_poll(bContext *C, bool clear, int flag)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         layer_collection_find_data_to_edit,
+                         layer_collection_collect_data_to_edit,
                          &data);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    LayerCollection *lc = reinterpret_cast<LayerCollection *>(
+    LayerCollection *lc = static_cast<LayerCollection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
 
     if (clear && (lc->flag & flag)) {
@@ -929,19 +950,19 @@ static int collection_view_layer_exec(bContext *C, wmOperator *op)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         layer_collection_find_data_to_edit,
+                         layer_collection_collect_data_to_edit,
                          &data);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    LayerCollection *lc = reinterpret_cast<LayerCollection *>(
+    LayerCollection *lc = static_cast<LayerCollection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
     BKE_layer_collection_set_flag(lc, flag, !clear);
   }
 
   BLI_gset_free(data.collections_to_edit, nullptr);
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_relations_tag_update(bmain);
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER, nullptr);
@@ -1063,12 +1084,12 @@ static int collection_isolate_exec(bContext *C, wmOperator *op)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         layer_collection_find_data_to_edit,
+                         layer_collection_collect_data_to_edit,
                          &data);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(
+    LayerCollection *layer_collection = static_cast<LayerCollection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
 
     if (extend) {
@@ -1090,7 +1111,7 @@ static int collection_isolate_exec(bContext *C, wmOperator *op)
   }
   BLI_gset_free(data.collections_to_edit, nullptr);
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER_CONTENT, nullptr);
@@ -1163,18 +1184,18 @@ static int collection_visibility_exec(bContext *C, wmOperator *op)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         layer_collection_find_data_to_edit,
+                         layer_collection_collect_data_to_edit,
                          &data);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(
+    LayerCollection *layer_collection = static_cast<LayerCollection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
-    BKE_layer_collection_set_visible(view_layer, layer_collection, show, is_inside);
+    BKE_layer_collection_set_visible(scene, view_layer, layer_collection, show, is_inside);
   }
   BLI_gset_free(data.collections_to_edit, nullptr);
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER_CONTENT, nullptr);
@@ -1315,11 +1336,11 @@ static int collection_flag_exec(bContext *C, wmOperator *op)
                            &space_outliner->tree,
                            0,
                            TSE_SELECTED,
-                           layer_collection_find_data_to_edit,
+                           layer_collection_collect_data_to_edit,
                            &data);
     GSetIterator collections_to_edit_iter;
     GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-      LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(
+      LayerCollection *layer_collection = static_cast<LayerCollection *>(
           BLI_gsetIterator_getKey(&collections_to_edit_iter));
       Collection *collection = layer_collection->collection;
       if (!BKE_id_is_editable(bmain, &collection->id)) {
@@ -1344,11 +1365,11 @@ static int collection_flag_exec(bContext *C, wmOperator *op)
                            &space_outliner->tree,
                            0,
                            TSE_SELECTED,
-                           collection_find_data_to_edit,
+                           collection_collect_data_to_edit,
                            &data);
     GSetIterator collections_to_edit_iter;
     GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-      Collection *collection = reinterpret_cast<Collection *>(
+      Collection *collection = static_cast<Collection *>(
           BLI_gsetIterator_getKey(&collections_to_edit_iter));
       if (!BKE_id_is_editable(bmain, &collection->id)) {
         continue;
@@ -1364,7 +1385,7 @@ static int collection_flag_exec(bContext *C, wmOperator *op)
     BLI_gset_free(data.collections_to_edit, nullptr);
   }
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   if (!is_render) {
@@ -1449,9 +1470,9 @@ struct OutlinerHideEditData {
 /** \name Visibility for Collection & Object Operators
  * \{ */
 
-static TreeTraversalAction outliner_hide_find_data_to_edit(TreeElement *te, void *customdata)
+static TreeTraversalAction outliner_hide_collect_data_to_edit(TreeElement *te, void *customdata)
 {
-  OutlinerHideEditData *data = reinterpret_cast<OutlinerHideEditData *>(customdata);
+  OutlinerHideEditData *data = static_cast<OutlinerHideEditData *>(customdata);
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (tselem == nullptr) {
@@ -1459,7 +1480,7 @@ static TreeTraversalAction outliner_hide_find_data_to_edit(TreeElement *te, void
   }
 
   if (tselem->type == TSE_LAYER_COLLECTION) {
-    LayerCollection *lc = reinterpret_cast<LayerCollection *>(te->directdata);
+    LayerCollection *lc = static_cast<LayerCollection *>(te->directdata);
 
     if (lc->collection->flag & COLLECTION_IS_MASTER) {
       /* Skip - showing warning/error message might be misleading
@@ -1473,6 +1494,7 @@ static TreeTraversalAction outliner_hide_find_data_to_edit(TreeElement *te, void
   }
   else if ((tselem->type == TSE_SOME_ID) && (te->idcode == ID_OB)) {
     Object *ob = (Object *)tselem->id;
+    BKE_view_layer_synced_ensure(data->scene, data->view_layer);
     Base *base = BKE_view_layer_base_find(data->view_layer, ob);
     BLI_gset_add(data->bases_to_edit, base);
   }
@@ -1496,25 +1518,25 @@ static int outliner_hide_exec(bContext *C, wmOperator *UNUSED(op))
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         outliner_hide_find_data_to_edit,
+                         outliner_hide_collect_data_to_edit,
                          &data);
 
   GSetIterator collections_to_edit_iter;
   GSET_ITER (collections_to_edit_iter, data.collections_to_edit) {
-    LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(
+    LayerCollection *layer_collection = static_cast<LayerCollection *>(
         BLI_gsetIterator_getKey(&collections_to_edit_iter));
-    BKE_layer_collection_set_visible(view_layer, layer_collection, false, false);
+    BKE_layer_collection_set_visible(scene, view_layer, layer_collection, false, false);
   }
   BLI_gset_free(data.collections_to_edit, nullptr);
 
   GSetIterator bases_to_edit_iter;
   GSET_ITER (bases_to_edit_iter, data.bases_to_edit) {
-    Base *base = reinterpret_cast<Base *>(BLI_gsetIterator_getKey(&bases_to_edit_iter));
+    Base *base = static_cast<Base *>(BLI_gsetIterator_getKey(&bases_to_edit_iter));
     base->flag |= BASE_HIDDEN;
   }
   BLI_gset_free(data.bases_to_edit, nullptr);
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER_CONTENT, nullptr);
@@ -1542,18 +1564,18 @@ static int outliner_unhide_all_exec(bContext *C, wmOperator *UNUSED(op))
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   /* Unhide all the collections. */
-  LayerCollection *lc_master = reinterpret_cast<LayerCollection *>(
-      view_layer->layer_collections.first);
+  LayerCollection *lc_master = static_cast<LayerCollection *>(view_layer->layer_collections.first);
   LISTBASE_FOREACH (LayerCollection *, lc_iter, &lc_master->layer_collections) {
     BKE_layer_collection_set_flag(lc_iter, LAYER_COLLECTION_HIDE, false);
   }
 
   /* Unhide all objects. */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     base->flag &= ~BASE_HIDDEN;
   }
 
-  BKE_layer_collection_sync(scene, view_layer);
+  BKE_view_layer_need_resync_tag(view_layer);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
   WM_main_add_notifier(NC_SCENE | ND_LAYER_CONTENT, nullptr);
@@ -1593,7 +1615,7 @@ static int outliner_color_tag_set_exec(bContext *C, wmOperator *op)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         outliner_find_selected_collections,
+                         outliner_collect_selected_collections,
                          &selected);
 
   LISTBASE_FOREACH (LinkData *, link, &selected.selected_array) {
@@ -1637,3 +1659,5 @@ void OUTLINER_OT_collection_color_tag_set(wmOperatorType *ot)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_context.cc b/source/blender/editors/space_outliner/outliner_context.cc
index 1a804cb58b8..001bda57fa2 100644
--- a/source/blender/editors/space_outliner/outliner_context.cc
+++ b/source/blender/editors/space_outliner/outliner_context.cc
@@ -14,7 +14,7 @@
 #include "outliner_intern.hh"
 #include "tree/tree_iterator.hh"
 
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 static void outliner_context_selected_ids_recursive(const SpaceOutliner &space_outliner,
                                                     bContextDataResult *result)
@@ -55,3 +55,5 @@ int /*eContextResult*/ outliner_context(const bContext *C,
 
   return CTX_RESULT_MEMBER_NOT_FOUND;
 }
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_dragdrop.cc b/source/blender/editors/space_outliner/outliner_dragdrop.cc
index c72080be811..758928fed8e 100644
--- a/source/blender/editors/space_outliner/outliner_dragdrop.cc
+++ b/source/blender/editors/space_outliner/outliner_dragdrop.cc
@@ -45,6 +45,8 @@
 
 #include "outliner_intern.hh"
 
+namespace blender::ed::outliner {
+
 static Collection *collection_parent_from_ID(ID *id);
 
 /* -------------------------------------------------------------------- */
@@ -144,7 +146,7 @@ static TreeElement *outliner_drop_insert_find(bContext *C,
           return te_hovered;
         }
         *r_insert_type = TE_INSERT_BEFORE;
-        return reinterpret_cast<TreeElement *>(te_hovered->subtree.first);
+        return static_cast<TreeElement *>(te_hovered->subtree.first);
       }
       *r_insert_type = TE_INSERT_AFTER;
       return te_hovered;
@@ -159,8 +161,8 @@ static TreeElement *outliner_drop_insert_find(bContext *C,
 
   /* Mouse doesn't hover any item (ignoring x-axis),
    * so it's either above list bounds or below. */
-  TreeElement *first = reinterpret_cast<TreeElement *>(space_outliner->tree.first);
-  TreeElement *last = reinterpret_cast<TreeElement *>(space_outliner->tree.last);
+  TreeElement *first = static_cast<TreeElement *>(space_outliner->tree.first);
+  TreeElement *last = static_cast<TreeElement *>(space_outliner->tree.last);
 
   if (view_mval[1] < last->ys) {
     *r_insert_type = TE_INSERT_AFTER;
@@ -291,6 +293,7 @@ static bool parent_drop_allowed(TreeElement *te, Object *potential_child)
    * active scene and parenting them is allowed (sergey) */
   if (scene) {
     LISTBASE_FOREACH (ViewLayer *, view_layer, &scene->view_layers) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
       if (BKE_view_layer_base_find(view_layer, potential_child)) {
         return true;
       }
@@ -422,12 +425,12 @@ static int parent_drop_invoke(bContext *C, wmOperator *op, const wmEvent *event)
     return OPERATOR_CANCELLED;
   }
 
-  ListBase *lb = reinterpret_cast<ListBase *>(event->customdata);
-  wmDrag *drag = reinterpret_cast<wmDrag *>(lb->first);
+  ListBase *lb = static_cast<ListBase *>(event->customdata);
+  wmDrag *drag = static_cast<wmDrag *>(lb->first);
 
   parent_drop_set_parents(C,
                           op->reports,
-                          reinterpret_cast<wmDragID *>(drag->ids.first),
+                          static_cast<wmDragID *>(drag->ids.first),
                           par,
                           PAR_OBJECT,
                           event->modifier & KM_ALT);
@@ -505,8 +508,8 @@ static int parent_clear_invoke(bContext *C, wmOperator *UNUSED(op), const wmEven
     return OPERATOR_CANCELLED;
   }
 
-  ListBase *lb = reinterpret_cast<ListBase *>(event->customdata);
-  wmDrag *drag = reinterpret_cast<wmDrag *>(lb->first);
+  ListBase *lb = static_cast<ListBase *>(event->customdata);
+  wmDrag *drag = static_cast<wmDrag *>(lb->first);
 
   LISTBASE_FOREACH (wmDragID *, drag_id, &drag->ids) {
     if (GS(drag_id->id->name) == ID_OB) {
@@ -578,6 +581,7 @@ static int scene_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent
   BKE_collection_object_add(bmain, collection, ob);
 
   LISTBASE_FOREACH (ViewLayer *, view_layer, &scene->view_layers) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base = BKE_view_layer_base_find(view_layer, ob);
     if (base) {
       ED_object_base_select(base, BA_SELECT);
@@ -849,7 +853,7 @@ static bool datastack_drop_poll(bContext *C, wmDrag *drag, const wmEvent *event)
   ARegion *region = CTX_wm_region(C);
   bool changed = outliner_flag_set(*space_outliner, TSE_HIGHLIGHTED_ANY | TSE_DRAG_ANY, false);
 
-  StackDropData *drop_data = reinterpret_cast<StackDropData *>(drag->poin);
+  StackDropData *drop_data = static_cast<StackDropData *>(drag->poin);
   if (!drop_data) {
     return false;
   }
@@ -887,7 +891,7 @@ static char *datastack_drop_tooltip(bContext *UNUSED(C),
                                     const int UNUSED(xy[2]),
                                     struct wmDropBox *UNUSED(drop))
 {
-  StackDropData *drop_data = reinterpret_cast<StackDropData *>(drag->poin);
+  StackDropData *drop_data = static_cast<StackDropData *>(drag->poin);
   switch (drop_data->drop_action) {
     case DATA_STACK_DROP_REORDER:
       return BLI_strdup(TIP_("Reorder"));
@@ -965,14 +969,13 @@ static void datastack_drop_copy(bContext *C, StackDropData *drop_data)
     case TSE_MODIFIER:
       if (drop_data->ob_parent->type == OB_GPENCIL && ob_dst->type == OB_GPENCIL) {
         ED_object_gpencil_modifier_copy_to_object(
-            ob_dst, reinterpret_cast<GpencilModifierData *>(drop_data->drag_directdata));
+            ob_dst, static_cast<GpencilModifierData *>(drop_data->drag_directdata));
       }
       else if (drop_data->ob_parent->type != OB_GPENCIL && ob_dst->type != OB_GPENCIL) {
-        ED_object_modifier_copy_to_object(
-            C,
-            ob_dst,
-            drop_data->ob_parent,
-            reinterpret_cast<ModifierData *>(drop_data->drag_directdata));
+        ED_object_modifier_copy_to_object(C,
+                                          ob_dst,
+                                          drop_data->ob_parent,
+                                          static_cast<ModifierData *>(drop_data->drag_directdata));
       }
       break;
     case TSE_CONSTRAINT:
@@ -980,12 +983,12 @@ static void datastack_drop_copy(bContext *C, StackDropData *drop_data)
         ED_object_constraint_copy_for_pose(
             bmain,
             ob_dst,
-            reinterpret_cast<bPoseChannel *>(drop_data->drop_te->directdata),
-            reinterpret_cast<bConstraint *>(drop_data->drag_directdata));
+            static_cast<bPoseChannel *>(drop_data->drop_te->directdata),
+            static_cast<bConstraint *>(drop_data->drag_directdata));
       }
       else {
         ED_object_constraint_copy_for_object(
-            bmain, ob_dst, reinterpret_cast<bConstraint *>(drop_data->drag_directdata));
+            bmain, ob_dst, static_cast<bConstraint *>(drop_data->drag_directdata));
       }
       break;
     case TSE_GPENCIL_EFFECT: {
@@ -993,8 +996,7 @@ static void datastack_drop_copy(bContext *C, StackDropData *drop_data)
         return;
       }
 
-      ED_object_shaderfx_copy(ob_dst,
-                              reinterpret_cast<ShaderFxData *>(drop_data->drag_directdata));
+      ED_object_shaderfx_copy(ob_dst, static_cast<ShaderFxData *>(drop_data->drag_directdata));
       break;
     }
   }
@@ -1021,15 +1023,12 @@ static void datastack_drop_reorder(bContext *C, ReportList *reports, StackDropDa
         index = outliner_get_insert_index(
             drag_te, drop_te, insert_type, &ob->greasepencil_modifiers);
         ED_object_gpencil_modifier_move_to_index(
-            reports,
-            ob,
-            reinterpret_cast<GpencilModifierData *>(drop_data->drag_directdata),
-            index);
+            reports, ob, static_cast<GpencilModifierData *>(drop_data->drag_directdata), index);
       }
       else {
         index = outliner_get_insert_index(drag_te, drop_te, insert_type, &ob->modifiers);
         ED_object_modifier_move_to_index(
-            reports, ob, reinterpret_cast<ModifierData *>(drop_data->drag_directdata), index);
+            reports, ob, static_cast<ModifierData *>(drop_data->drag_directdata), index);
       }
       break;
     case TSE_CONSTRAINT:
@@ -1041,13 +1040,13 @@ static void datastack_drop_reorder(bContext *C, ReportList *reports, StackDropDa
         index = outliner_get_insert_index(drag_te, drop_te, insert_type, &ob->constraints);
       }
       ED_object_constraint_move_to_index(
-          ob, reinterpret_cast<bConstraint *>(drop_data->drag_directdata), index);
+          ob, static_cast<bConstraint *>(drop_data->drag_directdata), index);
 
       break;
     case TSE_GPENCIL_EFFECT:
       index = outliner_get_insert_index(drag_te, drop_te, insert_type, &ob->shader_fx);
       ED_object_shaderfx_move_to_index(
-          reports, ob, reinterpret_cast<ShaderFxData *>(drop_data->drag_directdata), index);
+          reports, ob, static_cast<ShaderFxData *>(drop_data->drag_directdata), index);
   }
 }
 
@@ -1057,9 +1056,9 @@ static int datastack_drop_invoke(bContext *C, wmOperator *op, const wmEvent *eve
     return OPERATOR_CANCELLED;
   }
 
-  ListBase *lb = reinterpret_cast<ListBase *>(event->customdata);
-  wmDrag *drag = reinterpret_cast<wmDrag *>(lb->first);
-  StackDropData *drop_data = reinterpret_cast<StackDropData *>(drag->poin);
+  ListBase *lb = static_cast<ListBase *>(event->customdata);
+  wmDrag *drag = static_cast<wmDrag *>(lb->first);
+  StackDropData *drop_data = static_cast<StackDropData *>(drag->poin);
 
   switch (drop_data->drop_action) {
     case DATA_STACK_DROP_LINK:
@@ -1143,7 +1142,7 @@ static bool collection_drop_init(bContext *C, wmDrag *drag, const int xy[2], Col
     return false;
   }
 
-  wmDragID *drag_id = reinterpret_cast<wmDragID *>(drag->ids.first);
+  wmDragID *drag_id = static_cast<wmDragID *>(drag->ids.first);
   if (drag_id == nullptr) {
     return false;
   }
@@ -1300,8 +1299,8 @@ static int collection_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmE
     return OPERATOR_CANCELLED;
   }
 
-  ListBase *lb = reinterpret_cast<ListBase *>(event->customdata);
-  wmDrag *drag = reinterpret_cast<wmDrag *>(lb->first);
+  ListBase *lb = static_cast<ListBase *>(event->customdata);
+  wmDrag *drag = static_cast<wmDrag *>(lb->first);
 
   CollectionDrop data;
   if (!collection_drop_init(C, drag, event->xy, &data)) {
@@ -1455,7 +1454,7 @@ static int outliner_item_drag_drop_invoke(bContext *C,
                                        TSE_GPENCIL_EFFECT_BASE);
 
   const int wm_drag_type = use_datastack_drag ? WM_DRAG_DATASTACK : WM_DRAG_ID;
-  wmDrag *drag = WM_event_start_drag(C, data.icon, wm_drag_type, nullptr, 0.0, WM_DRAG_NOP);
+  wmDrag *drag = WM_drag_data_create(C, data.icon, wm_drag_type, nullptr, 0.0, WM_DRAG_NOP);
 
   if (use_datastack_drag) {
     TreeElement *te_bone = nullptr;
@@ -1479,7 +1478,7 @@ static int outliner_item_drag_drop_invoke(bContext *C,
                              &space_outliner->tree,
                              0,
                              TSE_SELECTED,
-                             outliner_find_selected_objects,
+                             outliner_collect_selected_objects,
                              &selected);
     }
     else {
@@ -1487,7 +1486,7 @@ static int outliner_item_drag_drop_invoke(bContext *C,
                              &space_outliner->tree,
                              0,
                              TSE_SELECTED,
-                             outliner_find_selected_collections,
+                             outliner_collect_selected_collections,
                              &selected);
     }
 
@@ -1545,6 +1544,8 @@ static int outliner_item_drag_drop_invoke(bContext *C,
     WM_drag_add_local_ID(drag, data.drag_id, data.drag_parent);
   }
 
+  WM_event_start_prepared_drag(C, drag);
+
   ED_outliner_select_sync_from_outliner(C, space_outliner);
 
   return (OPERATOR_FINISHED | OPERATOR_PASS_THROUGH);
@@ -1595,3 +1596,5 @@ void outliner_dropboxes(void)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_draw.cc b/source/blender/editors/space_outliner/outliner_draw.cc
index 753de83a10d..3c52f79a80e 100644
--- a/source/blender/editors/space_outliner/outliner_draw.cc
+++ b/source/blender/editors/space_outliner/outliner_draw.cc
@@ -37,6 +37,7 @@
 #include "BKE_lib_override.h"
 #include "BKE_library.h"
 #include "BKE_main.h"
+#include "BKE_main_namemap.h"
 #include "BKE_modifier.h"
 #include "BKE_node.h"
 #include "BKE_object.h"
@@ -73,8 +74,7 @@
 #include "tree/tree_element_rna.hh"
 #include "tree/tree_iterator.hh"
 
-using namespace blender;
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 /* -------------------------------------------------------------------- */
 /** \name Tree Size Functions
@@ -276,16 +276,17 @@ static void outliner_object_set_flag_recursive_fn(bContext *C,
 
   Object *ob_parent = ob ? ob : base->object;
 
-  for (Object *ob_iter = reinterpret_cast<Object *>(bmain->objects.first); ob_iter;
-       ob_iter = reinterpret_cast<Object *>(ob_iter->id.next)) {
+  for (Object *ob_iter = static_cast<Object *>(bmain->objects.first); ob_iter;
+       ob_iter = static_cast<Object *>(ob_iter->id.next)) {
     if (BKE_object_is_child_recursive(ob_parent, ob_iter)) {
       if (ob) {
         RNA_id_pointer_create(&ob_iter->id, &ptr);
         DEG_id_tag_update(&ob_iter->id, ID_RECALC_COPY_ON_WRITE);
       }
       else {
+        BKE_view_layer_synced_ensure(scene, view_layer);
         Base *base_iter = BKE_view_layer_base_find(view_layer, ob_iter);
-        /* Child can be in a collection excluded from viewlayer. */
+        /* Child can be in a collection excluded from view-layer. */
         if (base_iter == nullptr) {
           continue;
         }
@@ -301,7 +302,7 @@ static void outliner_object_set_flag_recursive_fn(bContext *C,
     DEG_relations_tag_update(bmain);
   }
   else {
-    BKE_layer_collection_sync(scene, view_layer);
+    BKE_view_layer_need_resync_tag(view_layer);
     DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   }
 }
@@ -311,8 +312,8 @@ static void outliner_object_set_flag_recursive_fn(bContext *C,
  */
 static void outliner__object_set_flag_recursive_fn(bContext *C, void *poin, void *poin2)
 {
-  Object *ob = reinterpret_cast<Object *>(poin);
-  char *propname = reinterpret_cast<char *>(poin2);
+  Object *ob = static_cast<Object *>(poin);
+  char *propname = static_cast<char *>(poin2);
   outliner_object_set_flag_recursive_fn(C, nullptr, ob, propname);
 }
 
@@ -321,8 +322,8 @@ static void outliner__object_set_flag_recursive_fn(bContext *C, void *poin, void
  */
 static void outliner__base_set_flag_recursive_fn(bContext *C, void *poin, void *poin2)
 {
-  Base *base = reinterpret_cast<Base *>(poin);
-  char *propname = reinterpret_cast<char *>(poin2);
+  Base *base = static_cast<Base *>(poin);
+  char *propname = static_cast<char *>(poin2);
   outliner_object_set_flag_recursive_fn(C, base, nullptr, propname);
 }
 
@@ -348,6 +349,7 @@ static void outliner_base_or_object_pointer_create(
     RNA_id_pointer_create(&ob->id, ptr);
   }
   else {
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base = BKE_view_layer_base_find(view_layer, ob);
     RNA_pointer_create(&scene->id, &RNA_ObjectBase, base, ptr);
   }
@@ -487,7 +489,7 @@ void outliner_collection_isolate_flag(Scene *scene,
   const bool is_hide = strstr(propname, "hide_") != nullptr;
 
   LayerCollection *top_layer_collection = layer_collection ?
-                                              reinterpret_cast<LayerCollection *>(
+                                              static_cast<LayerCollection *>(
                                                   view_layer->layer_collections.first) :
                                               nullptr;
   Collection *top_collection = collection ? scene->master_collection : nullptr;
@@ -558,7 +560,7 @@ void outliner_collection_isolate_flag(Scene *scene,
   else {
     CollectionParent *parent;
     Collection *child = collection;
-    while ((parent = reinterpret_cast<CollectionParent *>(child->parents.first))) {
+    while ((parent = static_cast<CollectionParent *>(child->parents.first))) {
       if (parent->collection->flag & COLLECTION_IS_MASTER) {
         break;
       }
@@ -637,8 +639,8 @@ static void view_layer__layer_collection_set_flag_recursive_fn(bContext *C,
                                                                void *poin,
                                                                void *poin2)
 {
-  LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(poin);
-  char *propname = reinterpret_cast<char *>(poin2);
+  LayerCollection *layer_collection = static_cast<LayerCollection *>(poin);
+  char *propname = static_cast<char *>(poin2);
   outliner_collection_set_flag_recursive_fn(C, layer_collection, nullptr, propname);
 }
 
@@ -648,8 +650,8 @@ static void view_layer__layer_collection_set_flag_recursive_fn(bContext *C,
  */
 static void view_layer__collection_set_flag_recursive_fn(bContext *C, void *poin, void *poin2)
 {
-  LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(poin);
-  char *propname = reinterpret_cast<char *>(poin2);
+  LayerCollection *layer_collection = static_cast<LayerCollection *>(poin);
+  char *propname = static_cast<char *>(poin2);
   outliner_collection_set_flag_recursive_fn(
       C, layer_collection, layer_collection->collection, propname);
 }
@@ -660,8 +662,8 @@ static void view_layer__collection_set_flag_recursive_fn(bContext *C, void *poin
  */
 static void scenes__collection_set_flag_recursive_fn(bContext *C, void *poin, void *poin2)
 {
-  Collection *collection = reinterpret_cast<Collection *>(poin);
-  char *propname = reinterpret_cast<char *>(poin2);
+  Collection *collection = static_cast<Collection *>(poin);
+  char *propname = static_cast<char *>(poin2);
   outliner_collection_set_flag_recursive_fn(C, nullptr, collection, propname);
 }
 
@@ -671,12 +673,13 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
   struct wmMsgBus *mbus = CTX_wm_message_bus(C);
   BLI_mempool *ts = space_outliner->treestore;
-  TreeStoreElem *tselem = reinterpret_cast<TreeStoreElem *>(tsep);
+  TreeStoreElem *tselem = static_cast<TreeStoreElem *>(tsep);
 
   if (ts && tselem) {
     TreeElement *te = outliner_find_tree_element(&space_outliner->tree, tselem);
 
     if (tselem->type == TSE_SOME_ID) {
+      BKE_main_namemap_remove_name(bmain, tselem->id, oldname);
       BLI_libblock_ensure_unique_name(bmain, tselem->id->name);
 
       WM_msg_publish_rna_prop(mbus, tselem->id, tselem->id, ID, name);
@@ -699,7 +702,6 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           if (ob->type == OB_MBALL) {
             DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
           }
-          DEG_id_tag_update(&ob->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         default:
@@ -730,26 +732,31 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           lib->id.tag &= ~LIB_TAG_MISSING;
         }
       }
+
+      DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
     }
     else {
       switch (tselem->type) {
         case TSE_DEFGROUP: {
           Object *ob = (Object *)tselem->id;
-          bDeformGroup *vg = reinterpret_cast<bDeformGroup *>(te->directdata);
+          bDeformGroup *vg = static_cast<bDeformGroup *>(te->directdata);
           BKE_object_defgroup_unique_name(vg, ob);
           WM_msg_publish_rna_prop(mbus, &ob->id, vg, VertexGroup, name);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_NLA_ACTION: {
           bAction *act = (bAction *)tselem->id;
+          BKE_main_namemap_remove_name(bmain, &act->id, oldname);
           BLI_libblock_ensure_unique_name(bmain, act->id.name);
           WM_msg_publish_rna_prop(mbus, &act->id, &act->id, ID, name);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_EBONE: {
           bArmature *arm = (bArmature *)tselem->id;
           if (arm->edbo) {
-            EditBone *ebone = reinterpret_cast<EditBone *>(te->directdata);
+            EditBone *ebone = static_cast<EditBone *>(te->directdata);
             char newname[sizeof(ebone->name)];
 
             /* restore bone name */
@@ -758,6 +765,7 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
             ED_armature_bone_rename(bmain, arm, oldname, newname);
             WM_msg_publish_rna_prop(mbus, &arm->id, ebone, EditBone, name);
             WM_event_add_notifier(C, NC_OBJECT | ND_POSE, nullptr);
+            DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           }
           break;
         }
@@ -767,7 +775,7 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           outliner_viewcontext_init(C, &tvc);
 
           bArmature *arm = (bArmature *)tselem->id;
-          Bone *bone = reinterpret_cast<Bone *>(te->directdata);
+          Bone *bone = static_cast<Bone *>(te->directdata);
           char newname[sizeof(bone->name)];
 
           /* always make current object active */
@@ -779,6 +787,7 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           ED_armature_bone_rename(bmain, arm, oldname, newname);
           WM_msg_publish_rna_prop(mbus, &arm->id, bone, Bone, name);
           WM_event_add_notifier(C, NC_OBJECT | ND_POSE, nullptr);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_POSE_CHANNEL: {
@@ -787,7 +796,7 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
 
           Object *ob = (Object *)tselem->id;
           bArmature *arm = (bArmature *)ob->data;
-          bPoseChannel *pchan = reinterpret_cast<bPoseChannel *>(te->directdata);
+          bPoseChannel *pchan = static_cast<bPoseChannel *>(te->directdata);
           char newname[sizeof(pchan->name)];
 
           /* always make current pose-bone active */
@@ -798,15 +807,16 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           /* restore bone name */
           BLI_strncpy(newname, pchan->name, sizeof(pchan->name));
           BLI_strncpy(pchan->name, oldname, sizeof(pchan->name));
-          ED_armature_bone_rename(
-              bmain, reinterpret_cast<bArmature *>(ob->data), oldname, newname);
+          ED_armature_bone_rename(bmain, static_cast<bArmature *>(ob->data), oldname, newname);
           WM_msg_publish_rna_prop(mbus, &arm->id, pchan->bone, Bone, name);
           WM_event_add_notifier(C, NC_OBJECT | ND_POSE, nullptr);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
+          DEG_id_tag_update(&arm->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_POSEGRP: {
           Object *ob = (Object *)tselem->id; /* id = object. */
-          bActionGroup *grp = reinterpret_cast<bActionGroup *>(te->directdata);
+          bActionGroup *grp = static_cast<bActionGroup *>(te->directdata);
 
           BLI_uniquename(&ob->pose->agroups,
                          grp,
@@ -816,11 +826,12 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
                          sizeof(grp->name));
           WM_msg_publish_rna_prop(mbus, &ob->id, grp, ActionGroup, name);
           WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_GP_LAYER: {
           bGPdata *gpd = (bGPdata *)tselem->id; /* id = GP Datablock */
-          bGPDlayer *gpl = reinterpret_cast<bGPDlayer *>(te->directdata);
+          bGPDlayer *gpl = static_cast<bGPDlayer *>(te->directdata);
 
           /* always make layer active */
           BKE_gpencil_layer_active_set(gpd, gpl);
@@ -832,11 +843,12 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           WM_msg_publish_rna_prop(mbus, &gpd->id, gpl, GPencilLayer, info);
           DEG_id_tag_update(&gpd->id, ID_RECALC_GEOMETRY);
           WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_SELECTED, gpd);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_R_LAYER: {
           Scene *scene = (Scene *)tselem->id;
-          ViewLayer *view_layer = reinterpret_cast<ViewLayer *>(te->directdata);
+          ViewLayer *view_layer = static_cast<ViewLayer *>(te->directdata);
 
           /* Restore old name. */
           char newname[sizeof(view_layer->name)];
@@ -847,14 +859,17 @@ static void namebutton_fn(bContext *C, void *tsep, char *oldname)
           BKE_view_layer_rename(bmain, scene, view_layer, newname);
           WM_msg_publish_rna_prop(mbus, &scene->id, view_layer, ViewLayer, name);
           WM_event_add_notifier(C, NC_ID | NA_RENAME, nullptr);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
         case TSE_LAYER_COLLECTION: {
           /* The ID is a #Collection, not a #LayerCollection */
           Collection *collection = (Collection *)tselem->id;
+          BKE_main_namemap_remove_name(bmain, &collection->id, oldname);
           BLI_libblock_ensure_unique_name(bmain, collection->id.name);
           WM_msg_publish_rna_prop(mbus, &collection->id, &collection->id, ID, name);
           WM_event_add_notifier(C, NC_ID | NA_RENAME, nullptr);
+          DEG_id_tag_update(tselem->id, ID_RECALC_COPY_ON_WRITE);
           break;
         }
       }
@@ -987,7 +1002,7 @@ static bool outliner_restrict_properties_collection_set(Scene *scene,
 {
   TreeStoreElem *tselem = TREESTORE(te);
   LayerCollection *layer_collection = (tselem->type == TSE_LAYER_COLLECTION) ?
-                                          reinterpret_cast<LayerCollection *>(te->directdata) :
+                                          static_cast<LayerCollection *>(te->directdata) :
                                           nullptr;
   Collection *collection = outliner_collection_from_tree_element(te);
 
@@ -1101,7 +1116,7 @@ static void outliner_draw_restrictbuts(uiBlock *block,
           ELEM(space_outliner->outlinevis, SO_SCENES, SO_VIEW_LAYER)) {
         if (space_outliner->show_restrict_flags & SO_RESTRICT_RENDER) {
           /* View layer render toggle. */
-          ViewLayer *layer = reinterpret_cast<ViewLayer *>(te->directdata);
+          ViewLayer *layer = static_cast<ViewLayer *>(te->directdata);
 
           bt = uiDefIconButBitS(block,
                                 UI_BTYPE_ICON_TOGGLE_N,
@@ -1133,6 +1148,7 @@ static void outliner_draw_restrictbuts(uiBlock *block,
         RNA_id_pointer_create(&ob->id, &ptr);
 
         if (space_outliner->show_restrict_flags & SO_RESTRICT_HIDE) {
+          BKE_view_layer_synced_ensure(scene, view_layer);
           Base *base = (te->directdata) ? (Base *)te->directdata :
                                           BKE_view_layer_base_find(view_layer, ob);
           if (base) {
@@ -1325,7 +1341,7 @@ static void outliner_draw_restrictbuts(uiBlock *block,
         bPoseChannel *pchan = (bPoseChannel *)te->directdata;
         Bone *bone = pchan->bone;
         Object *ob = (Object *)tselem->id;
-        bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
+        bArmature *arm = static_cast<bArmature *>(ob->data);
 
         RNA_pointer_create(&arm->id, &RNA_Bone, bone, &ptr);
 
@@ -1475,8 +1491,7 @@ static void outliner_draw_restrictbuts(uiBlock *block,
                 scene, te, &collection_ptr, &layer_collection_ptr, &props, &props_active)) {
 
           LayerCollection *layer_collection = (tselem->type == TSE_LAYER_COLLECTION) ?
-                                                  reinterpret_cast<LayerCollection *>(
-                                                      te->directdata) :
+                                                  static_cast<LayerCollection *>(te->directdata) :
                                                   nullptr;
           Collection *collection = outliner_collection_from_tree_element(te);
 
@@ -1802,18 +1817,17 @@ static void outliner_draw_overrides_rna_buts(uiBlock *block,
     if (!outliner_is_element_in_view(te, &region->v2d)) {
       continue;
     }
-    if (tselem->type != TSE_LIBRARY_OVERRIDE) {
+    TreeElementOverridesProperty *override_elem = tree_element_cast<TreeElementOverridesProperty>(
+        te);
+    if (!override_elem) {
       continue;
     }
 
-    TreeElementOverridesProperty &override_elem = *tree_element_cast<TreeElementOverridesProperty>(
-        te);
-
-    if (!override_elem.is_rna_path_valid) {
+    if (!override_elem->is_rna_path_valid) {
       uiBut *but = uiDefBut(block,
                             UI_BTYPE_LABEL,
                             0,
-                            override_elem.rna_path.c_str(),
+                            override_elem->rna_path.c_str(),
                             x + pad_x,
                             te->ys + pad_y,
                             item_max_width,
@@ -1828,8 +1842,28 @@ static void outliner_draw_overrides_rna_buts(uiBlock *block,
       continue;
     }
 
-    PointerRNA *ptr = &override_elem.override_rna_ptr;
-    PropertyRNA *prop = &override_elem.override_rna_prop;
+    if (const TreeElementOverridesPropertyOperation *override_op_elem =
+            tree_element_cast<TreeElementOverridesPropertyOperation>(te)) {
+      StringRefNull op_label = override_op_elem->getOverrideOperationLabel();
+      uiDefBut(block,
+               UI_BTYPE_LABEL,
+               0,
+               op_label.c_str(),
+               x + pad_x,
+               te->ys + pad_y,
+               item_max_width,
+               item_height,
+               nullptr,
+               0,
+               0,
+               0,
+               0,
+               "");
+      continue;
+    }
+
+    PointerRNA *ptr = &override_elem->override_rna_ptr;
+    PropertyRNA *prop = &override_elem->override_rna_prop;
     const PropertyType prop_type = RNA_property_type(prop);
 
     uiBut *auto_but = uiDefAutoButR(block,
@@ -1927,7 +1961,7 @@ static void outliner_draw_separator(ARegion *region, const int x)
   GPU_line_width(1.0f);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColorShadeAlpha(TH_BACK, -15, -200);
 
   immBegin(GPU_PRIM_LINES, 2);
@@ -2495,7 +2529,7 @@ TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te)
         data.drag_id = tselem->id;
         break;
       case TSE_CONSTRAINT: {
-        bConstraint *con = reinterpret_cast<bConstraint *>(te->directdata);
+        bConstraint *con = static_cast<bConstraint *>(te->directdata);
         data.drag_id = tselem->id;
         switch ((eBConstraint_Types)con->type) {
           case CONSTRAINT_TYPE_CAMERASOLVER:
@@ -2612,9 +2646,8 @@ TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te)
         data.drag_id = tselem->id;
 
         if (ob->type != OB_GPENCIL) {
-          ModifierData *md = reinterpret_cast<ModifierData *>(
-              BLI_findlink(&ob->modifiers, tselem->nr));
-          const ModifierTypeInfo *modifier_type = reinterpret_cast<const ModifierTypeInfo *>(
+          ModifierData *md = static_cast<ModifierData *>(BLI_findlink(&ob->modifiers, tselem->nr));
+          const ModifierTypeInfo *modifier_type = static_cast<const ModifierTypeInfo *>(
               BKE_modifier_get_info((ModifierType)md->type));
           if (modifier_type != nullptr) {
             data.icon = modifier_type->icon;
@@ -2625,7 +2658,7 @@ TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te)
         }
         else {
           /* grease pencil modifiers */
-          GpencilModifierData *md = reinterpret_cast<GpencilModifierData *>(
+          GpencilModifierData *md = static_cast<GpencilModifierData *>(
               BLI_findlink(&ob->greasepencil_modifiers, tselem->nr));
           switch ((GpencilModifierType)md->type) {
             case eGpencilModifierType_Noise:
@@ -2784,7 +2817,7 @@ TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te)
         const PointerRNA &ptr = te_rna_struct->getPointerRNA();
 
         if (RNA_struct_is_ID(ptr.type)) {
-          data.drag_id = reinterpret_cast<ID *>(ptr.data);
+          data.drag_id = static_cast<ID *>(ptr.data);
           data.icon = RNA_struct_ui_icon(ptr.type);
         }
         else {
@@ -2824,10 +2857,20 @@ TreeElementIcon tree_element_get_icon(TreeStoreElem *tselem, TreeElement *te)
     data.icon = tree_element_get_icon_from_id(tselem->id);
   }
 
+  if (!te->abstract_element) {
+    /* Pass */
+  }
+  else if (auto icon = te->abstract_element->getIcon()) {
+    data.icon = *icon;
+  }
+
   return data;
 }
 
-static void tselem_draw_icon(uiBlock *block,
+/**
+ * \return true if the element has an icon that was drawn, false if it doesn't have an icon.
+ */
+static bool tselem_draw_icon(uiBlock *block,
                              int xmax,
                              float x,
                              float y,
@@ -2838,7 +2881,7 @@ static void tselem_draw_icon(uiBlock *block,
 {
   TreeElementIcon data = tree_element_get_icon(tselem, te);
   if (data.icon == 0) {
-    return;
+    return false;
   }
 
   const bool is_collection = outliner_is_collection_tree_element(te);
@@ -2862,7 +2905,7 @@ static void tselem_draw_icon(uiBlock *block,
                         0.0f,
                         btheme->collection_color[collection->color_tag].color,
                         true);
-        return;
+        return true;
       }
     }
 
@@ -2894,6 +2937,8 @@ static void tselem_draw_icon(uiBlock *block,
                  alpha,
                  (data.drag_id && ID_IS_LINKED(data.drag_id)) ? data.drag_id->lib->filepath : "");
   }
+
+  return true;
 }
 
 /**
@@ -3088,6 +3133,7 @@ static void outliner_draw_iconrow(bContext *C,
                 TSE_GP_LAYER,
                 TSE_LIBRARY_OVERRIDE_BASE,
                 TSE_LIBRARY_OVERRIDE,
+                TSE_LIBRARY_OVERRIDE_OPERATION,
                 TSE_BONE,
                 TSE_EBONE,
                 TSE_POSE_CHANNEL,
@@ -3170,10 +3216,12 @@ static bool element_should_draw_faded(const TreeViewContext *tvc,
       case ID_OB: {
         const Object *ob = (const Object *)tselem->id;
         /* Lookup in view layer is logically const as it only checks a cache. */
+        BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
         const Base *base = (te->directdata) ? (const Base *)te->directdata :
                                               BKE_view_layer_base_find(
                                                   (ViewLayer *)tvc->view_layer, (Object *)ob);
-        const bool is_visible = (base != nullptr) && (base->flag & BASE_VISIBLE_VIEWLAYER);
+        const bool is_visible = (base != nullptr) &&
+                                (base->flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT);
         if (!is_visible) {
           return true;
         }
@@ -3237,6 +3285,7 @@ static void outliner_draw_tree_element(bContext *C,
     if (tselem->type == TSE_SOME_ID) {
       if (te->idcode == ID_OB) {
         Object *ob = (Object *)tselem->id;
+        BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
         Base *base = (te->directdata) ? (Base *)te->directdata :
                                         BKE_view_layer_base_find(tvc->view_layer, ob);
         const bool is_selected = (base != nullptr) && ((base->flag & BASE_SELECTED) != 0);
@@ -3292,7 +3341,7 @@ static void outliner_draw_tree_element(bContext *C,
       /* Scene collection in view layer can't expand/collapse. */
     }
     else if (te->subtree.first || ((tselem->type == TSE_SOME_ID) && (te->idcode == ID_SCE)) ||
-             (te->flag & TE_LAZY_CLOSED)) {
+             (te->flag & TE_PRETEND_HAS_CHILDREN)) {
       /* Open/close icon, only when sub-levels, except for scene. */
       int icon_x = startx;
 
@@ -3313,15 +3362,15 @@ static void outliner_draw_tree_element(bContext *C,
     offsx += UI_UNIT_X;
 
     /* Data-type icon. */
-    if (!(ELEM(tselem->type, TSE_RNA_PROPERTY, TSE_RNA_ARRAY_ELEM, TSE_ID_BASE))) {
-      tselem_draw_icon(block,
-                       xmax,
-                       (float)startx + offsx,
-                       (float)*starty,
-                       tselem,
-                       te,
-                       (tselem->flag & TSE_HIGHLIGHTED_ICON) ? alpha_fac + 0.5f : alpha_fac,
-                       true);
+    if (!(ELEM(tselem->type, TSE_RNA_PROPERTY, TSE_RNA_ARRAY_ELEM, TSE_ID_BASE)) &&
+        tselem_draw_icon(block,
+                         xmax,
+                         (float)startx + offsx,
+                         (float)*starty,
+                         tselem,
+                         te,
+                         (tselem->flag & TSE_HIGHLIGHTED_ICON) ? alpha_fac + 0.5f : alpha_fac,
+                         true)) {
       offsx += UI_UNIT_X + 4 * ufac;
     }
     else {
@@ -3508,7 +3557,7 @@ static void outliner_draw_hierarchy_lines(SpaceOutliner *space_outliner,
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   uchar col[4];
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -3539,7 +3588,7 @@ static void outliner_draw_struct_marks(ARegion *region,
       if (tselem->type == TSE_RNA_STRUCT) {
         GPUVertFormat *format = immVertexFormat();
         uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
         immThemeColorShadeAlpha(TH_BACK, -15, -200);
         immRecti(pos, 0, *starty + 1, (int)region->v2d.cur.xmax, *starty + UI_UNIT_Y - 1);
         immUnbindProgram();
@@ -3552,7 +3601,7 @@ static void outliner_draw_struct_marks(ARegion *region,
       if (tselem->type == TSE_RNA_STRUCT) {
         GPUVertFormat *format = immVertexFormat();
         uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
         immThemeColorShadeAlpha(TH_BACK, -15, -200);
 
         immBegin(GPU_PRIM_LINES, 2);
@@ -3657,7 +3706,7 @@ static void outliner_draw_highlights(ARegion *region,
   GPU_blend(GPU_BLEND_ALPHA);
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   outliner_draw_highlights(pos,
                            region,
                            space_outliner,
@@ -3758,7 +3807,7 @@ static void outliner_back(ARegion *region)
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   float col_alternating[4];
   UI_GetThemeColor4fv(TH_ROW_ALTERNATE, col_alternating);
@@ -3810,7 +3859,7 @@ static void outliner_update_viewable_area(ARegion *region,
   int sizex = outliner_width(space_outliner, tree_width, right_column_width);
   int sizey = tree_height;
 
-  /* Extend size to allow for horizontal scrollbar and extra offset. */
+  /* Extend size to allow for horizontal scroll-bar and extra offset. */
   sizey += V2D_SCROLL_HEIGHT + OL_Y_OFFSET;
 
   UI_view2d_totRect_set(&region->v2d, sizex, sizey);
@@ -3950,3 +3999,5 @@ void draw_outliner(const bContext *C)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_edit.cc b/source/blender/editors/space_outliner/outliner_edit.cc
index 32860bc2cff..be3c1547579 100644
--- a/source/blender/editors/space_outliner/outliner_edit.cc
+++ b/source/blender/editors/space_outliner/outliner_edit.cc
@@ -29,6 +29,7 @@
 #include "BKE_blender_copybuffer.h"
 #include "BKE_context.h"
 #include "BKE_idtype.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_lib_override.h"
 #include "BKE_lib_query.h"
@@ -55,6 +56,7 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 #include "RNA_enum_types.h"
+#include "RNA_path.h"
 
 #include "GPU_material.h"
 
@@ -64,6 +66,8 @@
 
 using namespace blender::ed::outliner;
 
+namespace blender::ed::outliner {
+
 static void outliner_show_active(SpaceOutliner *space_outliner,
                                  ARegion *region,
                                  TreeElement *te,
@@ -143,14 +147,10 @@ void OUTLINER_OT_highlight_update(wmOperatorType *ot)
 /** \name Toggle Open/Closed Operator
  * \{ */
 
-void outliner_item_openclose(SpaceOutliner *space_outliner,
-                             TreeElement *te,
-                             bool open,
-                             bool toggle_all)
+void outliner_item_openclose(TreeElement *te, bool open, bool toggle_all)
 {
-  /* Prevent opening leaf elements in the tree unless in the Data API display mode because in that
-   * mode subtrees are empty unless expanded. */
-  if (space_outliner->outlinevis != SO_DATA_API && BLI_listbase_is_empty(&te->subtree)) {
+  /* Only allow opening elements with children. */
+  if (!(te->flag & TE_PRETEND_HAS_CHILDREN) && BLI_listbase_is_empty(&te->subtree)) {
     return;
   }
 
@@ -197,7 +197,7 @@ static int outliner_item_openclose_modal(bContext *C, wmOperator *op, const wmEv
 
       /* Only toggle openclose on the same level as the first clicked element */
       if (te->xs == data->x_location) {
-        outliner_item_openclose(space_outliner, te, data->open, false);
+        outliner_item_openclose(te, data->open, false);
 
         outliner_tag_redraw_avoid_rebuild_on_open_change(space_outliner, region);
       }
@@ -241,7 +241,7 @@ static int outliner_item_openclose_invoke(bContext *C, wmOperator *op, const wmE
     const bool open = (tselem->flag & TSE_CLOSED) ||
                       (toggle_all && (outliner_flag_is_any_test(&te->subtree, TSE_CLOSED, 1)));
 
-    outliner_item_openclose(space_outliner, te, open, toggle_all);
+    outliner_item_openclose(te, open, toggle_all);
     outliner_tag_redraw_avoid_rebuild_on_open_change(space_outliner, region);
 
     /* Only toggle once for single click toggling */
@@ -597,9 +597,9 @@ static int outliner_id_remap_exec(bContext *C, wmOperator *op)
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
 
   const short id_type = (short)RNA_enum_get(op->ptr, "id_type");
-  ID *old_id = reinterpret_cast<ID *>(
+  ID *old_id = static_cast<ID *>(
       BLI_findlink(which_libbase(CTX_data_main(C), id_type), RNA_enum_get(op->ptr, "old_id")));
-  ID *new_id = reinterpret_cast<ID *>(
+  ID *new_id = static_cast<ID *>(
       BLI_findlink(which_libbase(CTX_data_main(C), id_type), RNA_enum_get(op->ptr, "new_id")));
 
   /* check for invalid states */
@@ -693,9 +693,9 @@ static const EnumPropertyItem *outliner_id_itemf(bContext *C,
   int i = 0;
 
   short id_type = (short)RNA_enum_get(ptr, "id_type");
-  ID *id = reinterpret_cast<ID *>(which_libbase(CTX_data_main(C), id_type)->first);
+  ID *id = static_cast<ID *>(which_libbase(CTX_data_main(C), id_type)->first);
 
-  for (; id; id = reinterpret_cast<ID *>(id->next)) {
+  for (; id; id = static_cast<ID *>(id->next)) {
     item_tmp.identifier = item_tmp.name = id->name + 2;
     item_tmp.value = i++;
     RNA_enum_item_add(&item, &totitem, &item_tmp);
@@ -1262,11 +1262,13 @@ static int outliner_open_back(TreeElement *te)
 /* Return element representing the active base or bone in the outliner, or NULL if none exists */
 static TreeElement *outliner_show_active_get_element(bContext *C,
                                                      SpaceOutliner *space_outliner,
+                                                     const Scene *scene,
                                                      ViewLayer *view_layer)
 {
   TreeElement *te;
 
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   if (!obact) {
     return nullptr;
@@ -1317,11 +1319,13 @@ static void outliner_show_active(SpaceOutliner *space_outliner,
 static int outliner_show_active_exec(bContext *C, wmOperator *UNUSED(op))
 {
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   ARegion *region = CTX_wm_region(C);
   View2D *v2d = &region->v2d;
 
-  TreeElement *active_element = outliner_show_active_get_element(C, space_outliner, view_layer);
+  TreeElement *active_element = outliner_show_active_get_element(
+      C, space_outliner, scene, view_layer);
 
   if (active_element) {
     ID *id = TREESTORE(active_element)->id;
@@ -1409,129 +1413,6 @@ void OUTLINER_OT_scroll_page(wmOperatorType *ot)
 
 /** \} */
 
-#if 0 /* TODO: probably obsolete now with filtering? */
-
-/* -------------------------------------------------------------------- */
-/** \name Search
- * \{ */
-
-
-/* find next element that has this name */
-static TreeElement *outliner_find_name(
-    SpaceOutliner *space_outliner, ListBase *lb, char *name, int flags, TreeElement *prev, int *prevFound)
-{
-  TreeElement *te, *tes;
-
-  for (te = lb->first; te; te = te->next) {
-    int found = outliner_filter_has_name(te, name, flags);
-
-    if (found) {
-      /* name is right, but is element the previous one? */
-      if (prev) {
-        if ((te != prev) && (*prevFound)) {
-          return te;
-        }
-        if (te == prev) {
-          *prevFound = 1;
-        }
-      }
-      else {
-        return te;
-      }
-    }
-
-    tes = outliner_find_name(space_outliner, &te->subtree, name, flags, prev, prevFound);
-    if (tes) {
-      return tes;
-    }
-  }
-
-  /* nothing valid found */
-  return nullptr;
-}
-
-static void outliner_find_panel(
-    Scene *UNUSED(scene), ARegion *region, SpaceOutliner *space_outliner, int again, int flags)
-{
-  ReportList *reports = nullptr;  /* CTX_wm_reports(C); */
-  TreeElement *te = nullptr;
-  TreeElement *last_find;
-  TreeStoreElem *tselem;
-  int ytop, xdelta, prevFound = 0;
-  char name[sizeof(space_outliner->search_string)];
-
-  /* get last found tree-element based on stored search_tse */
-  last_find = outliner_find_tse(space_outliner, &space_outliner->search_tse);
-
-  /* determine which type of search to do */
-  if (again && last_find) {
-    /* no popup panel - previous + user wanted to search for next after previous */
-    BLI_strncpy(name, space_outliner->search_string, sizeof(name));
-    flags = space_outliner->search_flags;
-
-    /* try to find matching element */
-    te = outliner_find_name(space_outliner, &space_outliner->tree, name, flags, last_find, &prevFound);
-    if (te == nullptr) {
-      /* no more matches after previous, start from beginning again */
-      prevFound = 1;
-      te = outliner_find_name(space_outliner, &space_outliner->tree, name, flags, last_find, &prevFound);
-    }
-  }
-  else {
-    /* pop up panel - no previous, or user didn't want search after previous */
-    name[0] = '\0';
-    // XXX      if (sbutton(name, 0, sizeof(name) - 1, "Find: ") && name[0]) {
-    //          te = outliner_find_name(space_outliner, &space_outliner->tree, name, flags, nullptr, &prevFound);
-    //      }
-    //      else return; XXX RETURN! XXX
-  }
-
-  /* do selection and reveal */
-  if (te) {
-    tselem = TREESTORE(te);
-    if (tselem) {
-      /* expand branches so that it will be visible, we need to get correct coordinates */
-      if (outliner_open_back(space_outliner, te)) {
-        outliner_set_coordinates(region, space_outliner);
-      }
-
-      /* deselect all visible, and select found element */
-      outliner_flag_set(space_outliner, &space_outliner->tree, TSE_SELECTED, 0);
-      tselem->flag |= TSE_SELECTED;
-
-      /* Make `te->ys` center of view. */
-      ytop = (int)(te->ys + BLI_rctf_size_y(&region->v2d.mask) / 2);
-      if (ytop > 0) {
-        ytop = 0;
-      }
-      region->v2d.cur.ymax = (float)ytop;
-      region->v2d.cur.ymin = (float)(ytop - BLI_rctf_size_y(&region->v2d.mask));
-
-      /* Make `te->xs` ==> `te->xend` center of view. */
-      xdelta = (int)(te->xs - region->v2d.cur.xmin);
-      region->v2d.cur.xmin += xdelta;
-      region->v2d.cur.xmax += xdelta;
-
-      /* store selection */
-      space_outliner->search_tse = *tselem;
-
-      BLI_strncpy(space_outliner->search_string, name, sizeof(space_outliner->search_string));
-      space_outliner->search_flags = flags;
-
-      /* redraw */
-      ED_region_tag_redraw_no_rebuild(region);
-    }
-  }
-  else {
-    /* no tree-element found */
-    BKE_reportf(reports, RPT_WARNING, "Not found: %s", name);
-  }
-}
-
-/** \} */
-
-#endif /* if 0 */
-
 /* -------------------------------------------------------------------- */
 /** \name Show One Level Operator
  * \{ */
@@ -1817,7 +1698,7 @@ static void tree_element_to_path(TreeElement *te,
         /* ptr->data not ptr->owner_id seems to be the one we want,
          * since ptr->data is sometimes the owner of this ID? */
         if (RNA_struct_is_ID(ptr.type)) {
-          *id = reinterpret_cast<ID *>(ptr.data);
+          *id = static_cast<ID *>(ptr.data);
 
           /* clear path */
           if (*path) {
@@ -2052,8 +1933,7 @@ static KeyingSet *verify_active_keyingset(Scene *scene, short add)
 
   /* try to find one from scene */
   if (scene->active_keyingset > 0) {
-    ks = reinterpret_cast<KeyingSet *>(
-        BLI_findlink(&scene->keyingsets, scene->active_keyingset - 1));
+    ks = static_cast<KeyingSet *>(BLI_findlink(&scene->keyingsets, scene->active_keyingset - 1));
   }
 
   /* Add if none found */
@@ -2357,3 +2237,5 @@ void OUTLINER_OT_orphans_purge(wmOperatorType *ot)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_intern.hh b/source/blender/editors/space_outliner/outliner_intern.hh
index 18173b37123..ad5d653949c 100644
--- a/source/blender/editors/space_outliner/outliner_intern.hh
+++ b/source/blender/editors/space_outliner/outliner_intern.hh
@@ -14,10 +14,6 @@
 /* Needed for `tree_element_cast()`. */
 #include "tree/tree_element.hh"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* internal exports only */
 
 struct ARegion;
@@ -27,7 +23,6 @@ struct ListBase;
 struct Main;
 struct Object;
 struct Scene;
-struct TreeElement;
 struct TreeStoreElem;
 struct ViewLayer;
 struct bContext;
@@ -37,47 +32,52 @@ struct View2D;
 struct wmKeyConfig;
 struct wmOperatorType;
 
+namespace blender::bke::outliner::treehash {
+class TreeHash;
+}
+
 namespace blender::ed::outliner {
+
 class AbstractTreeDisplay;
 class AbstractTreeElement;
-}  // namespace blender::ed::outliner
 
-namespace outliner = blender::ed::outliner;
+namespace treehash = blender::bke::outliner::treehash;
+
+struct TreeElement;
 
 struct SpaceOutliner_Runtime {
   /** Object to create and manage the tree for a specific display type (View Layers, Scenes,
    * Blender File, etc.). */
-  std::unique_ptr<outliner::AbstractTreeDisplay> tree_display;
+  std::unique_ptr<AbstractTreeDisplay> tree_display;
 
-  /** Pointers to tree-store elements, grouped by `(id, type, nr)`
-   *  in hash-table for faster searching. */
-  struct GHash *treehash;
+  /* Hash table for tree-store elements, using `(id, type, index)` as key. */
+  std::unique_ptr<treehash::TreeHash> tree_hash;
 
   SpaceOutliner_Runtime() = default;
   /** Used for copying runtime data to a duplicated space. */
   SpaceOutliner_Runtime(const SpaceOutliner_Runtime &);
-  ~SpaceOutliner_Runtime();
+  ~SpaceOutliner_Runtime() = default;
 };
 
-typedef enum TreeElementInsertType {
+enum TreeElementInsertType {
   TE_INSERT_BEFORE,
   TE_INSERT_AFTER,
   TE_INSERT_INTO,
-} TreeElementInsertType;
+};
 
-typedef enum TreeTraversalAction {
+enum TreeTraversalAction {
   /** Continue traversal regularly, don't skip children. */
   TRAVERSE_CONTINUE = 0,
   /** Stop traversal. */
   TRAVERSE_BREAK,
   /** Continue traversal, but skip children of traversed element. */
   TRAVERSE_SKIP_CHILDS,
-} TreeTraversalAction;
+};
 
-typedef TreeTraversalAction (*TreeTraversalFunc)(struct TreeElement *te, void *customdata);
+typedef TreeTraversalAction (*TreeTraversalFunc)(TreeElement *te, void *customdata);
 
-typedef struct TreeElement {
-  struct TreeElement *next, *prev, *parent;
+struct TreeElement {
+  TreeElement *next, *prev, *parent;
 
   /**
    * The new inheritance based representation of the element (a derived type of base
@@ -85,7 +85,7 @@ typedef struct TreeElement {
    * be moved to it and operations based on the type should become virtual methods of the class
    * hierarchy.
    */
-  std::unique_ptr<outliner::AbstractTreeElement> abstract_element;
+  std::unique_ptr<AbstractTreeElement> abstract_element;
 
   ListBase subtree;
   int xs, ys;                /* Do selection. */
@@ -96,12 +96,12 @@ typedef struct TreeElement {
   short xend;                /* Width of item display, for select. */
   const char *name;
   void *directdata; /* Armature Bones, Base, ... */
-} TreeElement;
+};
 
-typedef struct TreeElementIcon {
+struct TreeElementIcon {
   struct ID *drag_id, *drag_parent;
   int icon;
-} TreeElementIcon;
+};
 
 #define TREESTORE_ID_TYPE(_id) \
   (ELEM(GS((_id)->name), \
@@ -153,7 +153,10 @@ enum {
   /* Closed items display their children as icon within the row. TE_ICONROW is for
    * these child-items that are visible but only within the row of the closed parent. */
   TE_ICONROW = (1 << 1),
-  TE_LAZY_CLOSED = (1 << 2),
+  /** Treat the element as if it had children, e.g. draw an icon to un-collapse it, even if it
+   * doesn't. Used where children are lazy-built only if the parent isn't collapsed (see
+   * #AbstractTreeDisplay::is_lazy_built()). */
+  TE_PRETEND_HAS_CHILDREN = (1 << 2),
   TE_FREE_NAME = (1 << 3),
   TE_DRAGGING = (1 << 4),
   TE_CHILD_NOT_IN_COLLECTION = (1 << 6),
@@ -165,17 +168,17 @@ enum {
 /* button events */
 #define OL_NAMEBUTTON 1
 
-typedef enum {
+enum eOLDrawState {
   OL_DRAWSEL_NONE = 0,   /* inactive (regular black text) */
   OL_DRAWSEL_NORMAL = 1, /* active object (draws white text) */
   OL_DRAWSEL_ACTIVE = 2, /* active obdata (draws a circle around the icon) */
-} eOLDrawState;
+};
 
-typedef enum {
+enum eOLSetState {
   OL_SETSEL_NONE = 0,   /* don't change the selection state */
   OL_SETSEL_NORMAL = 1, /* select the item */
   OL_SETSEL_EXTEND = 2, /* select the item and extend (also toggles selection) */
-} eOLSetState;
+};
 
 /* get TreeStoreElem associated with a TreeElement
  * < a: (TreeElement) tree element to find stored element for
@@ -225,29 +228,29 @@ typedef enum {
  * Container to avoid passing around these variables to many functions.
  * Also so we can have one place to assign these variables.
  */
-typedef struct TreeViewContext {
+struct TreeViewContext {
   /* Scene level. */
   struct Scene *scene;
   struct ViewLayer *view_layer;
 
   /* Object level. */
-  /** Avoid OBACT macro everywhere. */
+  /** Avoid `BKE_view_layer_active_object_get` everywhere. */
   Object *obact;
   Object *ob_edit;
   /**
    * The pose object may not be the active object (when in weight paint mode).
    * Checking this in draw loops isn't efficient, so set only once. */
   Object *ob_pose;
-} TreeViewContext;
+};
 
-typedef enum TreeItemSelectAction {
+enum TreeItemSelectAction {
   OL_ITEM_DESELECT = 0,           /* Deselect the item */
   OL_ITEM_SELECT = (1 << 0),      /* Select the item */
   OL_ITEM_SELECT_DATA = (1 << 1), /* Select object data */
   OL_ITEM_ACTIVATE = (1 << 2),    /* Activate the item */
   OL_ITEM_EXTEND = (1 << 3),      /* Extend the current selection */
   OL_ITEM_RECURSIVE = (1 << 4),   /* Select recursively */
-} TreeItemSelectAction;
+};
 
 /* outliner_tree.c ----------------------------------------------- */
 
@@ -270,24 +273,19 @@ void outliner_build_tree(struct Main *mainvar,
                          struct SpaceOutliner *space_outliner,
                          struct ARegion *region);
 
-struct TreeElement *outliner_add_collection_recursive(SpaceOutliner *space_outliner,
-                                                      struct Collection *collection,
-                                                      TreeElement *ten);
+TreeElement *outliner_add_collection_recursive(SpaceOutliner *space_outliner,
+                                               struct Collection *collection,
+                                               TreeElement *ten);
 
 bool outliner_requires_rebuild_on_select_or_active_change(
     const struct SpaceOutliner *space_outliner);
-/**
- * Check if a display mode needs a full rebuild if the open/collapsed state changes.
- * Element types in these modes don't actually add children if collapsed, so the rebuild is needed.
- */
-bool outliner_requires_rebuild_on_open_change(const struct SpaceOutliner *space_outliner);
 
 typedef struct IDsSelectedData {
   struct ListBase selected_array;
 } IDsSelectedData;
 
-TreeTraversalAction outliner_find_selected_collections(struct TreeElement *te, void *customdata);
-TreeTraversalAction outliner_find_selected_objects(struct TreeElement *te, void *customdata);
+TreeTraversalAction outliner_collect_selected_collections(TreeElement *te, void *customdata);
+TreeTraversalAction outliner_collect_selected_objects(TreeElement *te, void *customdata);
 
 /* outliner_draw.c ---------------------------------------------- */
 
@@ -349,7 +347,7 @@ struct bPoseChannel *outliner_find_parent_bone(TreeElement *te, TreeElement **r_
  */
 void outliner_item_select(struct bContext *C,
                           struct SpaceOutliner *space_outliner,
-                          struct TreeElement *te,
+                          TreeElement *te,
                           short select_flag);
 
 /**
@@ -379,7 +377,7 @@ void outliner_item_mode_toggle(struct bContext *C,
 typedef void (*outliner_operation_fn)(struct bContext *C,
                                       struct ReportList *,
                                       struct Scene *scene,
-                                      struct TreeElement *,
+                                      TreeElement *,
                                       struct TreeStoreElem *,
                                       TreeStoreElem *,
                                       void *);
@@ -408,12 +406,10 @@ int outliner_flag_is_any_test(ListBase *lb, short flag, int curlevel);
  * Set or unset \a flag for all outliner elements in \a lb and sub-trees.
  * \return if any flag was modified.
  */
-extern "C++" {
 bool outliner_flag_set(const SpaceOutliner &space_outliner, short flag, short set);
 bool outliner_flag_set(const ListBase &lb, short flag, short set);
 bool outliner_flag_flip(const SpaceOutliner &space_outliner, short flag);
 bool outliner_flag_flip(const ListBase &lb, short flag);
-}
 
 void item_rename_fn(struct bContext *C,
                     struct ReportList *reports,
@@ -425,14 +421,14 @@ void item_rename_fn(struct bContext *C,
 void lib_relocate_fn(struct bContext *C,
                      struct ReportList *reports,
                      struct Scene *scene,
-                     struct TreeElement *te,
+                     TreeElement *te,
                      struct TreeStoreElem *tsep,
                      struct TreeStoreElem *tselem,
                      void *user_data);
 void lib_reload_fn(struct bContext *C,
                    struct ReportList *reports,
                    struct Scene *scene,
-                   struct TreeElement *te,
+                   TreeElement *te,
                    struct TreeStoreElem *tsep,
                    struct TreeStoreElem *tselem,
                    void *user_data);
@@ -440,14 +436,14 @@ void lib_reload_fn(struct bContext *C,
 void id_delete_tag_fn(struct bContext *C,
                       struct ReportList *reports,
                       struct Scene *scene,
-                      struct TreeElement *te,
+                      TreeElement *te,
                       struct TreeStoreElem *tsep,
                       struct TreeStoreElem *tselem,
                       void *user_data);
 void id_remap_fn(struct bContext *C,
                  struct ReportList *reports,
                  struct Scene *scene,
-                 struct TreeElement *te,
+                 TreeElement *te,
                  struct TreeStoreElem *tsep,
                  struct TreeStoreElem *tselem,
                  void *user_data);
@@ -461,10 +457,7 @@ void outliner_set_coordinates(const struct ARegion *region,
 /**
  * Open or close a tree element, optionally toggling all children recursively.
  */
-void outliner_item_openclose(struct SpaceOutliner *space_outliner,
-                             TreeElement *te,
-                             bool open,
-                             bool toggle_all);
+void outliner_item_openclose(TreeElement *te, bool open, bool toggle_all);
 
 /* outliner_dragdrop.c */
 
@@ -530,6 +523,8 @@ void OUTLINER_OT_operation(struct wmOperatorType *ot);
 void OUTLINER_OT_scene_operation(struct wmOperatorType *ot);
 void OUTLINER_OT_object_operation(struct wmOperatorType *ot);
 void OUTLINER_OT_lib_operation(struct wmOperatorType *ot);
+void OUTLINER_OT_liboverride_operation(struct wmOperatorType *ot);
+void OUTLINER_OT_liboverride_troubleshoot_operation(struct wmOperatorType *ot);
 void OUTLINER_OT_id_operation(struct wmOperatorType *ot);
 void OUTLINER_OT_id_remap(struct wmOperatorType *ot);
 void OUTLINER_OT_id_copy(struct wmOperatorType *ot);
@@ -610,10 +605,6 @@ TreeElement *outliner_find_item_at_x_in_row(const SpaceOutliner *space_outliner,
                                             bool *r_is_merged_icon,
                                             bool *r_is_over_icon);
 /**
- * `tse` is not in the tree-store, we use its contents to find a match.
- */
-TreeElement *outliner_find_tse(struct SpaceOutliner *space_outliner, const TreeStoreElem *tse);
-/**
  * Find specific item from the trees-tore.
  */
 TreeElement *outliner_find_tree_element(ListBase *lb, const TreeStoreElem *store_elem);
@@ -689,12 +680,6 @@ int outliner_context(const struct bContext *C,
                      const char *member,
                      struct bContextDataResult *result);
 
-#ifdef __cplusplus
-}
-#endif
-
-namespace blender::ed::outliner {
-
 /**
  * Helper to safely "cast" a #TreeElement to its new C++ #AbstractTreeElement, if possible.
  * \return nullptr if the tree-element doesn't match the requested type \a TreeElementT or the
diff --git a/source/blender/editors/space_outliner/outliner_ops.cc b/source/blender/editors/space_outliner/outliner_ops.cc
index 8baac45666e..cf9c4834667 100644
--- a/source/blender/editors/space_outliner/outliner_ops.cc
+++ b/source/blender/editors/space_outliner/outliner_ops.cc
@@ -11,6 +11,7 @@
 
 #include "outliner_intern.hh"
 
+namespace blender::ed::outliner {
 /* -------------------------------------------------------------------- */
 /** \name Registration
  * \{ */
@@ -29,6 +30,8 @@ void outliner_operatortypes(void)
   WM_operatortype_append(OUTLINER_OT_object_operation);
   WM_operatortype_append(OUTLINER_OT_lib_operation);
   WM_operatortype_append(OUTLINER_OT_lib_relocate);
+  WM_operatortype_append(OUTLINER_OT_liboverride_operation);
+  WM_operatortype_append(OUTLINER_OT_liboverride_troubleshoot_operation);
   WM_operatortype_append(OUTLINER_OT_id_operation);
   WM_operatortype_append(OUTLINER_OT_id_delete);
   WM_operatortype_append(OUTLINER_OT_id_remap);
@@ -101,3 +104,5 @@ void outliner_keymap(wmKeyConfig *keyconf)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_query.cc b/source/blender/editors/space_outliner/outliner_query.cc
index d6483c44fce..11929cbe2f0 100644
--- a/source/blender/editors/space_outliner/outliner_query.cc
+++ b/source/blender/editors/space_outliner/outliner_query.cc
@@ -13,7 +13,7 @@
 #include "outliner_intern.hh"
 #include "tree/tree_display.hh"
 
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 bool outliner_shows_mode_column(const SpaceOutliner &space_outliner)
 {
@@ -46,3 +46,5 @@ bool outliner_has_element_warnings(const SpaceOutliner &space_outliner)
 
   return recursive_fn(space_outliner.tree);
 }
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_select.cc b/source/blender/editors/space_outliner/outliner_select.cc
index 877e0fc325c..15079448317 100644
--- a/source/blender/editors/space_outliner/outliner_select.cc
+++ b/source/blender/editors/space_outliner/outliner_select.cc
@@ -70,7 +70,7 @@
 #include "tree/tree_element_seq.hh"
 #include "tree/tree_iterator.hh"
 
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 /* -------------------------------------------------------------------- */
 /** \name Internal Utilities
@@ -164,9 +164,10 @@ static void do_outliner_item_mode_toggle_generic(bContext *C, TreeViewContext *t
   ED_undo_group_begin(C);
 
   if (ED_object_mode_set(C, OB_MODE_OBJECT)) {
+    BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
     Base *base_active = BKE_view_layer_base_find(tvc->view_layer, tvc->obact);
     if (base_active != base) {
-      BKE_view_layer_base_deselect_all(tvc->view_layer);
+      BKE_view_layer_base_deselect_all(tvc->scene, tvc->view_layer);
       BKE_view_layer_base_select_and_set_active(tvc->view_layer, base);
       DEG_id_tag_update(&tvc->scene->id, ID_RECALC_SELECT);
       ED_undo_push(C, "Change Active");
@@ -188,10 +189,12 @@ void outliner_item_mode_toggle(bContext *C,
 
   if ((tselem->type == TSE_SOME_ID) && (te->idcode == ID_OB)) {
     Object *ob = (Object *)tselem->id;
+    BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
     Base *base = BKE_view_layer_base_find(tvc->view_layer, ob);
 
     /* Hidden objects can be removed from the mode. */
-    if (!base || (!(base->flag & BASE_VISIBLE_DEPSGRAPH) && (ob->mode != tvc->obact->mode))) {
+    if (!base || (!(base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) &&
+                  (ob->mode != tvc->obact->mode))) {
       return;
     }
 
@@ -220,7 +223,7 @@ static void tree_element_viewlayer_activate(bContext *C, TreeElement *te)
     return;
   }
 
-  ViewLayer *view_layer = reinterpret_cast<ViewLayer *>(te->directdata);
+  ViewLayer *view_layer = static_cast<ViewLayer *>(te->directdata);
   wmWindow *win = CTX_wm_window(C);
   Scene *scene = WM_window_get_active_scene(win);
 
@@ -233,15 +236,15 @@ static void tree_element_viewlayer_activate(bContext *C, TreeElement *te)
 /**
  * Select object tree
  */
-static void do_outliner_object_select_recursive(ViewLayer *view_layer,
+static void do_outliner_object_select_recursive(const Scene *scene,
+                                                ViewLayer *view_layer,
                                                 Object *ob_parent,
                                                 bool select)
 {
-  Base *base;
-
-  for (base = reinterpret_cast<Base *>(FIRSTBASE(view_layer)); base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     Object *ob = base->object;
-    if ((((base->flag & BASE_VISIBLE_DEPSGRAPH) != 0) &&
+    if ((((base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) != 0) &&
          BKE_object_is_child_recursive(ob_parent, ob))) {
       ED_object_base_select(base, select ? BA_SELECT : BA_DESELECT);
     }
@@ -301,7 +304,8 @@ static void tree_element_object_activate(bContext *C,
       ob = (Object *)parent_tselem->id;
 
       /* Don't return when activating children of the previous active object. */
-      if (ob == OBACT(view_layer) && set == OL_SETSEL_NONE) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      if (ob == BKE_view_layer_active_object_get(view_layer) && set == OL_SETSEL_NONE) {
         return;
       }
     }
@@ -317,11 +321,12 @@ static void tree_element_object_activate(bContext *C,
   }
 
   /* find associated base in current scene */
+  BKE_view_layer_synced_ensure(sce, view_layer);
   base = BKE_view_layer_base_find(view_layer, ob);
 
   if (scene->toolsettings->object_flag & SCE_OBJECT_MODE_LOCK) {
     if (base != nullptr) {
-      Object *obact = OBACT(view_layer);
+      Object *obact = BKE_view_layer_active_object_get(view_layer);
       const eObjectMode object_mode = obact ? (eObjectMode)obact->mode : OB_MODE_OBJECT;
       if (base && !BKE_object_is_mode_compat(base->object, object_mode)) {
         if (object_mode == OB_MODE_OBJECT) {
@@ -362,7 +367,7 @@ static void tree_element_object_activate(bContext *C,
       if ((scene->toolsettings->object_flag & SCE_OBJECT_MODE_LOCK) ?
               (ob->mode == OB_MODE_OBJECT) :
               true) {
-        BKE_view_layer_base_deselect_all(view_layer);
+        BKE_view_layer_base_deselect_all(scene, view_layer);
       }
       ED_object_base_select(base, BA_SELECT);
       if (parent_tselem) {
@@ -372,7 +377,8 @@ static void tree_element_object_activate(bContext *C,
 
     if (recursive) {
       /* Recursive select/deselect for Object hierarchies */
-      do_outliner_object_select_recursive(view_layer, ob, (base->flag & BASE_SELECTED) != 0);
+      do_outliner_object_select_recursive(
+          scene, view_layer, ob, (base->flag & BASE_SELECTED) != 0);
     }
 
     if (set != OL_SETSEL_NONE) {
@@ -383,12 +389,17 @@ static void tree_element_object_activate(bContext *C,
   }
 }
 
-static void tree_element_material_activate(bContext *C, ViewLayer *view_layer, TreeElement *te)
+static void tree_element_material_activate(bContext *C,
+                                           const Scene *scene,
+                                           ViewLayer *view_layer,
+                                           TreeElement *te)
 {
   /* we search for the object parent */
   Object *ob = (Object *)outliner_search_back(te, ID_OB);
   /* Note : ob->matbits can be nullptr when a local object points to a library mesh. */
-  if (ob == nullptr || ob != OBACT(view_layer) || ob->matbits == nullptr) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (ob == nullptr || ob != BKE_view_layer_active_object_get(view_layer) ||
+      ob->matbits == nullptr) {
     return; /* just paranoia */
   }
 
@@ -418,7 +429,7 @@ static void tree_element_camera_activate(bContext *C, Scene *scene, TreeElement
   scene->camera = ob;
 
   Main *bmain = CTX_data_main(C);
-  wmWindowManager *wm = reinterpret_cast<wmWindowManager *>(bmain->wm.first);
+  wmWindowManager *wm = static_cast<wmWindowManager *>(bmain->wm.first);
 
   WM_windows_scene_data_sync(&wm->windows, scene);
   DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
@@ -458,7 +469,7 @@ static void tree_element_defgroup_activate(bContext *C, TreeElement *te, TreeSto
 static void tree_element_gplayer_activate(bContext *C, TreeElement *te, TreeStoreElem *tselem)
 {
   bGPdata *gpd = (bGPdata *)tselem->id;
-  bGPDlayer *gpl = reinterpret_cast<bGPDlayer *>(te->directdata);
+  bGPDlayer *gpl = static_cast<bGPDlayer *>(te->directdata);
 
   /* We can only have a single "active" layer at a time
    * and there must always be an active layer... */
@@ -479,6 +490,7 @@ static void tree_element_posegroup_activate(bContext *C, TreeElement *te, TreeSt
 }
 
 static void tree_element_posechannel_activate(bContext *C,
+                                              const Scene *scene,
                                               ViewLayer *view_layer,
                                               TreeElement *te,
                                               TreeStoreElem *tselem,
@@ -486,14 +498,15 @@ static void tree_element_posechannel_activate(bContext *C,
                                               bool recursive)
 {
   Object *ob = (Object *)tselem->id;
-  bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
-  bPoseChannel *pchan = reinterpret_cast<bPoseChannel *>(te->directdata);
+  bArmature *arm = static_cast<bArmature *>(ob->data);
+  bPoseChannel *pchan = static_cast<bPoseChannel *>(te->directdata);
 
   if (!(pchan->bone->flag & BONE_HIDDEN_P)) {
     if (set != OL_SETSEL_EXTEND) {
       /* Single select forces all other bones to get unselected. */
       uint objects_len = 0;
-      Object **objects = BKE_object_pose_array_get_unique(view_layer, nullptr, &objects_len);
+      Object **objects = BKE_object_pose_array_get_unique(
+          scene, view_layer, nullptr, &objects_len);
 
       for (uint object_index = 0; object_index < objects_len; object_index++) {
         Object *ob_iter = BKE_object_pose_armature_get(objects[object_index]);
@@ -508,7 +521,7 @@ static void tree_element_posechannel_activate(bContext *C,
         }
 
         if (ob != ob_iter) {
-          DEG_id_tag_update(reinterpret_cast<ID *>(ob_iter->data), ID_RECALC_SELECT);
+          DEG_id_tag_update(static_cast<ID *>(ob_iter->data), ID_RECALC_SELECT);
         }
       }
       MEM_freeN(objects);
@@ -534,6 +547,7 @@ static void tree_element_posechannel_activate(bContext *C,
 }
 
 static void tree_element_bone_activate(bContext *C,
+                                       const Scene *scene,
                                        ViewLayer *view_layer,
                                        TreeElement *te,
                                        TreeStoreElem *tselem,
@@ -541,14 +555,15 @@ static void tree_element_bone_activate(bContext *C,
                                        bool recursive)
 {
   bArmature *arm = (bArmature *)tselem->id;
-  Bone *bone = reinterpret_cast<Bone *>(te->directdata);
+  Bone *bone = static_cast<Bone *>(te->directdata);
 
   if (!(bone->flag & BONE_HIDDEN_P)) {
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
     if (ob) {
       if (set != OL_SETSEL_EXTEND) {
         /* single select forces all other bones to get unselected */
-        for (Bone *bone_iter = reinterpret_cast<Bone *>(arm->bonebase.first); bone_iter != nullptr;
+        for (Bone *bone_iter = static_cast<Bone *>(arm->bonebase.first); bone_iter != nullptr;
              bone_iter = bone_iter->next) {
           bone_iter->flag &= ~(BONE_TIPSEL | BONE_SELECTED | BONE_ROOTSEL);
           do_outliner_bone_select_recursive(arm, bone_iter, false);
@@ -583,6 +598,7 @@ static void tree_element_active_ebone__sel(bContext *C, bArmature *arm, EditBone
   WM_event_add_notifier(C, NC_OBJECT | ND_BONE_ACTIVE, CTX_data_edit_object(C));
 }
 static void tree_element_ebone_activate(bContext *C,
+                                        const Scene *scene,
                                         ViewLayer *view_layer,
                                         TreeElement *te,
                                         TreeStoreElem *tselem,
@@ -590,7 +606,7 @@ static void tree_element_ebone_activate(bContext *C,
                                         bool recursive)
 {
   bArmature *arm = (bArmature *)tselem->id;
-  EditBone *ebone = reinterpret_cast<EditBone *>(te->directdata);
+  EditBone *ebone = static_cast<EditBone *>(te->directdata);
 
   if (set == OL_SETSEL_NORMAL) {
     if (!(ebone->flag & BONE_HIDDEN_A)) {
@@ -601,7 +617,7 @@ static void tree_element_ebone_activate(bContext *C,
       ob_params.no_dup_data = true;
 
       Base **bases = BKE_view_layer_array_from_bases_in_mode_params(
-          view_layer, nullptr, &bases_len, &ob_params);
+          scene, view_layer, nullptr, &bases_len, &ob_params);
       ED_armature_edit_deselect_all_multi_ex(bases, bases_len);
       MEM_freeN(bases);
 
@@ -648,6 +664,7 @@ static void tree_element_psys_activate(bContext *C, TreeStoreElem *tselem)
 }
 
 static void tree_element_constraint_activate(bContext *C,
+                                             const Scene *scene,
                                              ViewLayer *view_layer,
                                              TreeElement *te,
                                              TreeStoreElem *tselem,
@@ -660,7 +677,7 @@ static void tree_element_constraint_activate(bContext *C,
   while (te) {
     tselem = TREESTORE(te);
     if (tselem->type == TSE_POSE_CHANNEL) {
-      tree_element_posechannel_activate(C, view_layer, te, tselem, set, false);
+      tree_element_posechannel_activate(C, scene, view_layer, te, tselem, set, false);
       return;
     }
     te = te->parent;
@@ -703,7 +720,7 @@ static void tree_element_sequence_dup_activate(Scene *scene, TreeElement *UNUSED
 #if 0
   select_single_seq(seq, 1);
 #endif
-  Sequence *p = reinterpret_cast<Sequence *>(ed->seqbasep->first);
+  Sequence *p = static_cast<Sequence *>(ed->seqbasep->first);
   while (p) {
     if ((!p->strip) || (!p->strip->stripdata) || (p->strip->stripdata->name[0] == '\0')) {
       p = p->next;
@@ -722,7 +739,7 @@ static void tree_element_sequence_dup_activate(Scene *scene, TreeElement *UNUSED
 static void tree_element_master_collection_activate(const bContext *C)
 {
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(
+  LayerCollection *layer_collection = static_cast<LayerCollection *>(
       view_layer->layer_collections.first);
   BKE_layer_collection_activate(view_layer, layer_collection);
   /* A very precise notifier - ND_LAYER alone is quite vague, we want to avoid unnecessary work
@@ -733,7 +750,7 @@ static void tree_element_master_collection_activate(const bContext *C)
 static void tree_element_layer_collection_activate(bContext *C, TreeElement *te)
 {
   Scene *scene = CTX_data_scene(C);
-  LayerCollection *layer_collection = reinterpret_cast<LayerCollection *>(te->directdata);
+  LayerCollection *layer_collection = static_cast<LayerCollection *>(te->directdata);
   ViewLayer *view_layer = BKE_view_layer_find_from_collection(scene, layer_collection);
   BKE_layer_collection_activate(view_layer, layer_collection);
   /* A very precise notifier - ND_LAYER alone is quite vague, we want to avoid unnecessary work
@@ -765,7 +782,7 @@ void tree_element_activate(bContext *C,
       }
       break;
     case ID_MA:
-      tree_element_material_activate(C, tvc->view_layer, te);
+      tree_element_material_activate(C, tvc->scene, tvc->view_layer, te);
       break;
     case ID_WO:
       tree_element_world_activate(C, tvc->scene, te);
@@ -792,10 +809,10 @@ void tree_element_type_active_set(bContext *C,
       tree_element_defgroup_activate(C, te, tselem);
       break;
     case TSE_BONE:
-      tree_element_bone_activate(C, tvc->view_layer, te, tselem, set, recursive);
+      tree_element_bone_activate(C, tvc->scene, tvc->view_layer, te, tselem, set, recursive);
       break;
     case TSE_EBONE:
-      tree_element_ebone_activate(C, tvc->view_layer, te, tselem, set, recursive);
+      tree_element_ebone_activate(C, tvc->scene, tvc->view_layer, te, tselem, set, recursive);
       break;
     case TSE_MODIFIER:
       tree_element_modifier_activate(C, te, tselem, set);
@@ -809,11 +826,12 @@ void tree_element_type_active_set(bContext *C,
     case TSE_POSE_BASE:
       return;
     case TSE_POSE_CHANNEL:
-      tree_element_posechannel_activate(C, tvc->view_layer, te, tselem, set, recursive);
+      tree_element_posechannel_activate(
+          C, tvc->scene, tvc->view_layer, te, tselem, set, recursive);
       break;
     case TSE_CONSTRAINT_BASE:
     case TSE_CONSTRAINT:
-      tree_element_constraint_activate(C, tvc->view_layer, te, tselem, set);
+      tree_element_constraint_activate(C, tvc->scene, tvc->view_layer, te, tselem, set);
       break;
     case TSE_R_LAYER:
       tree_element_viewlayer_activate(C, te);
@@ -839,12 +857,14 @@ void tree_element_type_active_set(bContext *C,
   }
 }
 
-static eOLDrawState tree_element_defgroup_state_get(const ViewLayer *view_layer,
+static eOLDrawState tree_element_defgroup_state_get(const Scene *scene,
+                                                    ViewLayer *view_layer,
                                                     const TreeElement *te,
                                                     const TreeStoreElem *tselem)
 {
   const Object *ob = (const Object *)tselem->id;
-  if (ob == OBACT(view_layer)) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (ob == BKE_view_layer_active_object_get(view_layer)) {
     if (BKE_object_defgroup_active_index_get(ob) == te->index + 1) {
       return OL_DRAWSEL_NORMAL;
     }
@@ -852,13 +872,15 @@ static eOLDrawState tree_element_defgroup_state_get(const ViewLayer *view_layer,
   return OL_DRAWSEL_NONE;
 }
 
-static eOLDrawState tree_element_bone_state_get(const ViewLayer *view_layer,
+static eOLDrawState tree_element_bone_state_get(const Scene *scene,
+                                                ViewLayer *view_layer,
                                                 const TreeElement *te,
                                                 const TreeStoreElem *tselem)
 {
   const bArmature *arm = (const bArmature *)tselem->id;
-  const Bone *bone = reinterpret_cast<Bone *>(te->directdata);
-  const Object *ob = OBACT(view_layer);
+  const Bone *bone = static_cast<Bone *>(te->directdata);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Object *ob = BKE_view_layer_active_object_get(view_layer);
   if (ob && ob->data == arm) {
     if (bone->flag & BONE_SELECTED) {
       return OL_DRAWSEL_NORMAL;
@@ -869,7 +891,7 @@ static eOLDrawState tree_element_bone_state_get(const ViewLayer *view_layer,
 
 static eOLDrawState tree_element_ebone_state_get(const TreeElement *te)
 {
-  const EditBone *ebone = reinterpret_cast<EditBone *>(te->directdata);
+  const EditBone *ebone = static_cast<EditBone *>(te->directdata);
   if (ebone->flag & BONE_SELECTED) {
     return OL_DRAWSEL_NORMAL;
   }
@@ -891,11 +913,13 @@ static eOLDrawState tree_element_object_state_get(const TreeViewContext *tvc,
   return (tselem->id == (const ID *)tvc->obact) ? OL_DRAWSEL_NORMAL : OL_DRAWSEL_NONE;
 }
 
-static eOLDrawState tree_element_pose_state_get(const ViewLayer *view_layer,
+static eOLDrawState tree_element_pose_state_get(const Scene *scene,
+                                                const ViewLayer *view_layer,
                                                 const TreeStoreElem *tselem)
 {
   const Object *ob = (const Object *)tselem->id;
   /* This will just lookup in a cache, it will not change the arguments. */
+  BKE_view_layer_synced_ensure(scene, (ViewLayer *)view_layer);
   const Base *base = BKE_view_layer_base_find((ViewLayer *)view_layer, (Object *)ob);
   if (base == nullptr) {
     /* Armature not instantiated in current scene (e.g. inside an appended group). */
@@ -913,7 +937,7 @@ static eOLDrawState tree_element_posechannel_state_get(const Object *ob_pose,
                                                        const TreeStoreElem *tselem)
 {
   const Object *ob = (const Object *)tselem->id;
-  const bPoseChannel *pchan = reinterpret_cast<bPoseChannel *>(te->directdata);
+  const bPoseChannel *pchan = static_cast<bPoseChannel *>(te->directdata);
   if (ob == ob_pose && ob->pose) {
     if (pchan->bone->flag & BONE_SELECTED) {
       return OL_DRAWSEL_NORMAL;
@@ -929,7 +953,7 @@ static eOLDrawState tree_element_viewlayer_state_get(const bContext *C, const Tr
     return OL_DRAWSEL_NONE;
   }
 
-  const ViewLayer *view_layer = reinterpret_cast<ViewLayer *>(te->directdata);
+  const ViewLayer *view_layer = static_cast<ViewLayer *>(te->directdata);
 
   if (CTX_data_view_layer(C) == view_layer) {
     return OL_DRAWSEL_NORMAL;
@@ -937,13 +961,15 @@ static eOLDrawState tree_element_viewlayer_state_get(const bContext *C, const Tr
   return OL_DRAWSEL_NONE;
 }
 
-static eOLDrawState tree_element_posegroup_state_get(const ViewLayer *view_layer,
+static eOLDrawState tree_element_posegroup_state_get(const Scene *scene,
+                                                     ViewLayer *view_layer,
                                                      const TreeElement *te,
                                                      const TreeStoreElem *tselem)
 {
   const Object *ob = (const Object *)tselem->id;
 
-  if (ob == OBACT(view_layer) && ob->pose) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (ob == BKE_view_layer_active_object_get(view_layer) && ob->pose) {
     if (ob->pose->active_group == te->index + 1) {
       return OL_DRAWSEL_NORMAL;
     }
@@ -1003,13 +1029,16 @@ static eOLDrawState tree_element_layer_collection_state_get(const bContext *C,
   return OL_DRAWSEL_NONE;
 }
 
-static eOLDrawState tree_element_active_material_get(const ViewLayer *view_layer,
+static eOLDrawState tree_element_active_material_get(const Scene *scene,
+                                                     ViewLayer *view_layer,
                                                      const TreeElement *te)
 {
   /* we search for the object parent */
   const Object *ob = (const Object *)outliner_search_back((TreeElement *)te, ID_OB);
   /* Note : ob->matbits can be nullptr when a local object points to a library mesh. */
-  if (ob == nullptr || ob != OBACT(view_layer) || ob->matbits == nullptr) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (ob == nullptr || ob != BKE_view_layer_active_object_get(view_layer) ||
+      ob->matbits == nullptr) {
     return OL_DRAWSEL_NONE; /* just paranoia */
   }
 
@@ -1078,7 +1107,7 @@ eOLDrawState tree_element_active_state_get(const TreeViewContext *tvc,
       return OL_DRAWSEL_NONE;
       break;
     case ID_MA:
-      return tree_element_active_material_get(tvc->view_layer, te);
+      return tree_element_active_material_get(tvc->scene, tvc->view_layer, te);
     case ID_WO:
       return tree_element_active_world_get(tvc->scene, te);
     case ID_CA:
@@ -1094,9 +1123,9 @@ eOLDrawState tree_element_type_active_state_get(const bContext *C,
 {
   switch (tselem->type) {
     case TSE_DEFGROUP:
-      return tree_element_defgroup_state_get(tvc->view_layer, te, tselem);
+      return tree_element_defgroup_state_get(tvc->scene, tvc->view_layer, te, tselem);
     case TSE_BONE:
-      return tree_element_bone_state_get(tvc->view_layer, te, tselem);
+      return tree_element_bone_state_get(tvc->scene, tvc->view_layer, te, tselem);
     case TSE_EBONE:
       return tree_element_ebone_state_get(te);
     case TSE_MODIFIER:
@@ -1106,7 +1135,7 @@ eOLDrawState tree_element_type_active_state_get(const bContext *C,
     case TSE_LINKED_PSYS:
       return OL_DRAWSEL_NONE;
     case TSE_POSE_BASE:
-      return tree_element_pose_state_get(tvc->view_layer, tselem);
+      return tree_element_pose_state_get(tvc->scene, tvc->view_layer, tselem);
     case TSE_POSE_CHANNEL:
       return tree_element_posechannel_state_get(tvc->ob_pose, te, tselem);
     case TSE_CONSTRAINT_BASE:
@@ -1115,7 +1144,7 @@ eOLDrawState tree_element_type_active_state_get(const bContext *C,
     case TSE_R_LAYER:
       return tree_element_viewlayer_state_get(C, te);
     case TSE_POSEGRP:
-      return tree_element_posegroup_state_get(tvc->view_layer, te, tselem);
+      return tree_element_posegroup_state_get(tvc->scene, tvc->view_layer, te, tselem);
     case TSE_SEQUENCE:
       return tree_element_sequence_state_get(tvc->scene, te);
     case TSE_SEQUENCE_DUP:
@@ -1229,7 +1258,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
 
         /* Expand the selected constraint in the properties editor. */
         if (tselem->type != TSE_CONSTRAINT_BASE) {
-          BKE_constraint_panel_expand(reinterpret_cast<bConstraint *>(te->directdata));
+          BKE_constraint_panel_expand(static_cast<bConstraint *>(te->directdata));
         }
         break;
       }
@@ -1242,8 +1271,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
           Object *ob = (Object *)tselem->id;
 
           if (ob->type == OB_GPENCIL) {
-            BKE_gpencil_modifier_panel_expand(
-                reinterpret_cast<GpencilModifierData *>(te->directdata));
+            BKE_gpencil_modifier_panel_expand(static_cast<GpencilModifierData *>(te->directdata));
           }
           else {
             ModifierData *md = (ModifierData *)te->directdata;
@@ -1276,12 +1304,12 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
         context = BCONTEXT_SHADERFX;
 
         if (tselem->type != TSE_GPENCIL_EFFECT_BASE) {
-          BKE_shaderfx_panel_expand(reinterpret_cast<ShaderFxData *>(te->directdata));
+          BKE_shaderfx_panel_expand(static_cast<ShaderFxData *>(te->directdata));
         }
         break;
       case TSE_BONE: {
         bArmature *arm = (bArmature *)tselem->id;
-        Bone *bone = reinterpret_cast<Bone *>(te->directdata);
+        Bone *bone = static_cast<Bone *>(te->directdata);
 
         RNA_pointer_create(&arm->id, &RNA_Bone, bone, &ptr);
         context = BCONTEXT_BONE;
@@ -1289,7 +1317,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
       }
       case TSE_EBONE: {
         bArmature *arm = (bArmature *)tselem->id;
-        EditBone *ebone = reinterpret_cast<EditBone *>(te->directdata);
+        EditBone *ebone = static_cast<EditBone *>(te->directdata);
 
         RNA_pointer_create(&arm->id, &RNA_EditBone, ebone, &ptr);
         context = BCONTEXT_BONE;
@@ -1297,8 +1325,8 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
       }
       case TSE_POSE_CHANNEL: {
         Object *ob = (Object *)tselem->id;
-        bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
-        bPoseChannel *pchan = reinterpret_cast<bPoseChannel *>(te->directdata);
+        bArmature *arm = static_cast<bArmature *>(ob->data);
+        bPoseChannel *pchan = static_cast<bPoseChannel *>(te->directdata);
 
         RNA_pointer_create(&arm->id, &RNA_PoseBone, pchan, &ptr);
         context = BCONTEXT_BONE;
@@ -1306,7 +1334,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
       }
       case TSE_POSE_BASE: {
         Object *ob = (Object *)tselem->id;
-        bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
+        bArmature *arm = static_cast<bArmature *>(ob->data);
 
         RNA_pointer_create(&arm->id, &RNA_Armature, arm, &ptr);
         context = BCONTEXT_DATA;
@@ -1314,7 +1342,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
       }
       case TSE_R_LAYER_BASE:
       case TSE_R_LAYER: {
-        ViewLayer *view_layer = reinterpret_cast<ViewLayer *>(te->directdata);
+        ViewLayer *view_layer = static_cast<ViewLayer *>(te->directdata);
 
         RNA_pointer_create(tselem->id, &RNA_ViewLayer, view_layer, &ptr);
         context = BCONTEXT_VIEW_LAYER;
@@ -1323,7 +1351,7 @@ static void outliner_set_properties_tab(bContext *C, TreeElement *te, TreeStoreE
       case TSE_POSEGRP_BASE:
       case TSE_POSEGRP: {
         Object *ob = (Object *)tselem->id;
-        bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
+        bArmature *arm = static_cast<bArmature *>(ob->data);
 
         RNA_pointer_create(&arm->id, &RNA_Armature, arm, &ptr);
         context = BCONTEXT_DATA;
@@ -1397,6 +1425,7 @@ static void do_outliner_item_activate_tree_element(bContext *C,
     }
     else if ((te->idcode == ID_GR) && (space_outliner->outlinevis != SO_VIEW_LAYER)) {
       Collection *gr = (Collection *)tselem->id;
+      BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
 
       if (extend) {
         eObjectSelect_Mode sel = BA_SELECT;
@@ -1418,7 +1447,7 @@ static void do_outliner_item_activate_tree_element(bContext *C,
         FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
       }
       else {
-        BKE_view_layer_base_deselect_all(tvc->view_layer);
+        BKE_view_layer_base_deselect_all(tvc->scene, tvc->view_layer);
 
         FOREACH_COLLECTION_OBJECT_RECURSIVE_BEGIN (gr, object) {
           Base *base = BKE_view_layer_base_find(tvc->view_layer, object);
@@ -1570,8 +1599,10 @@ static bool outliner_is_co_within_active_mode_column(bContext *C,
                                                      SpaceOutliner *space_outliner,
                                                      const float view_mval[2])
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
 
   return outliner_is_co_within_mode_column(space_outliner, view_mval) && obact &&
          obact->mode != OB_MODE_OBJECT;
@@ -1823,7 +1854,7 @@ static TreeElement *outliner_find_rightmost_visible_child(SpaceOutliner *space_o
 {
   while (te->subtree.last) {
     if (TSELEM_OPEN(TREESTORE(te), space_outliner)) {
-      te = reinterpret_cast<TreeElement *>(te->subtree.last);
+      te = static_cast<TreeElement *>(te->subtree.last);
     }
     else {
       break;
@@ -1867,7 +1898,7 @@ static TreeElement *outliner_find_next_element(SpaceOutliner *space_outliner, Tr
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (TSELEM_OPEN(tselem, space_outliner) && te->subtree.first) {
-    te = reinterpret_cast<TreeElement *>(te->subtree.first);
+    te = static_cast<TreeElement *>(te->subtree.first);
   }
   else if (te->next) {
     te = te->next;
@@ -1886,7 +1917,7 @@ static TreeElement *outliner_walk_left(SpaceOutliner *space_outliner,
   TreeStoreElem *tselem = TREESTORE(te);
 
   if (TSELEM_OPEN(tselem, space_outliner)) {
-    outliner_item_openclose(space_outliner, te, false, toggle_all);
+    outliner_item_openclose(te, false, toggle_all);
   }
   /* Only walk up a level if the element is closed and not toggling expand */
   else if (!toggle_all && te->parent) {
@@ -1904,10 +1935,10 @@ static TreeElement *outliner_walk_right(SpaceOutliner *space_outliner,
 
   /* Only walk down a level if the element is open and not toggling expand */
   if (!toggle_all && TSELEM_OPEN(tselem, space_outliner) && !BLI_listbase_is_empty(&te->subtree)) {
-    te = reinterpret_cast<TreeElement *>(te->subtree.first);
+    te = static_cast<TreeElement *>(te->subtree.first);
   }
   else {
-    outliner_item_openclose(space_outliner, te, true, toggle_all);
+    outliner_item_openclose(te, true, toggle_all);
   }
 
   return te;
@@ -1955,7 +1986,7 @@ static TreeElement *find_walk_select_start_element(SpaceOutliner *space_outliner
 
   /* If no active element exists, use the first element in the tree */
   if (!active_te) {
-    active_te = reinterpret_cast<TreeElement *>(space_outliner->tree.first);
+    active_te = static_cast<TreeElement *>(space_outliner->tree.first);
     *changed = true;
   }
 
@@ -2041,3 +2072,5 @@ void OUTLINER_OT_select_walk(wmOperatorType *ot)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_sync.cc b/source/blender/editors/space_outliner/outliner_sync.cc
index 36bc7c31b91..995c83b589d 100644
--- a/source/blender/editors/space_outliner/outliner_sync.cc
+++ b/source/blender/editors/space_outliner/outliner_sync.cc
@@ -77,8 +77,8 @@ void ED_outliner_select_sync_flag_outliners(const bContext *C)
   Main *bmain = CTX_data_main(C);
   wmWindowManager *wm = CTX_wm_manager(C);
 
-  for (bScreen *screen = reinterpret_cast<bScreen *>(bmain->screens.first); screen;
-       screen = reinterpret_cast<bScreen *>(screen->id.next)) {
+  for (bScreen *screen = static_cast<bScreen *>(bmain->screens.first); screen;
+       screen = static_cast<bScreen *>(screen->id.next)) {
     LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
       LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
         if (sl->spacetype == SPACE_OUTLINER) {
@@ -94,6 +94,8 @@ void ED_outliner_select_sync_flag_outliners(const bContext *C)
   wm->outliner_sync_select_dirty = 0;
 }
 
+namespace blender::ed::outliner {
+
 /**
  * Outliner sync select dirty flags are not enough to determine which types to sync,
  * outliner display mode also needs to be considered. This stores the types of data
@@ -223,7 +225,8 @@ static void outliner_select_sync_to_object(ViewLayer *view_layer,
   }
 }
 
-static void outliner_select_sync_to_edit_bone(ViewLayer *view_layer,
+static void outliner_select_sync_to_edit_bone(const Scene *scene,
+                                              ViewLayer *view_layer,
                                               TreeElement *te,
                                               TreeStoreElem *tselem,
                                               GSet *selected_ebones)
@@ -248,7 +251,8 @@ static void outliner_select_sync_to_edit_bone(ViewLayer *view_layer,
 
   /* Tag if selection changed */
   if (bone_flag != ebone->flag) {
-    Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obedit = BKE_view_layer_edit_object_get(view_layer);
     DEG_id_tag_update(&arm->id, ID_RECALC_SELECT);
     WM_main_add_notifier(NC_OBJECT | ND_BONE_SELECT, obedit);
   }
@@ -259,7 +263,7 @@ static void outliner_select_sync_to_pose_bone(TreeElement *te,
                                               GSet *selected_pbones)
 {
   Object *ob = (Object *)tselem->id;
-  bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
+  bArmature *arm = static_cast<bArmature *>(ob->data);
   bPoseChannel *pchan = (bPoseChannel *)te->directdata;
 
   short bone_flag = pchan->bone->flag;
@@ -316,7 +320,8 @@ static void outliner_sync_selection_from_outliner(Scene *scene,
     }
     else if (tselem->type == TSE_EBONE) {
       if (sync_types->edit_bone) {
-        outliner_select_sync_to_edit_bone(view_layer, te, tselem, selected_items->edit_bones);
+        outliner_select_sync_to_edit_bone(
+            scene, view_layer, te, tselem, selected_items->edit_bones);
       }
     }
     else if (tselem->type == TSE_POSE_CHANNEL) {
@@ -335,8 +340,12 @@ static void outliner_sync_selection_from_outliner(Scene *scene,
   }
 }
 
+}  // namespace blender::ed::outliner
+
 void ED_outliner_select_sync_from_outliner(bContext *C, SpaceOutliner *space_outliner)
 {
+  using namespace blender::ed::outliner;
+
   /* Don't sync if not checked or in certain outliner display modes */
   if (!(space_outliner->flag & SO_SYNC_SELECT) || ELEM(space_outliner->outlinevis,
                                                        SO_LIBRARIES,
@@ -380,12 +389,16 @@ void ED_outliner_select_sync_from_outliner(bContext *C, SpaceOutliner *space_out
   }
 }
 
-static void outliner_select_sync_from_object(ViewLayer *view_layer,
+namespace blender::ed::outliner {
+
+static void outliner_select_sync_from_object(const Scene *scene,
+                                             ViewLayer *view_layer,
                                              Object *obact,
                                              TreeElement *te,
                                              TreeStoreElem *tselem)
 {
   Object *ob = (Object *)tselem->id;
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = (te->directdata) ? (Base *)te->directdata :
                                   BKE_view_layer_base_find(view_layer, ob);
   const bool is_selected = (base != nullptr) && ((base->flag & BASE_SELECTED) != 0);
@@ -479,7 +492,8 @@ struct SyncSelectActiveData {
 };
 
 /** Sync select and active flags from active view layer, bones, and sequences to the outliner. */
-static void outliner_sync_selection_to_outliner(ViewLayer *view_layer,
+static void outliner_sync_selection_to_outliner(const Scene *scene,
+                                                ViewLayer *view_layer,
                                                 SpaceOutliner *space_outliner,
                                                 ListBase *tree,
                                                 SyncSelectActiveData *active_data,
@@ -490,7 +504,7 @@ static void outliner_sync_selection_to_outliner(ViewLayer *view_layer,
 
     if ((tselem->type == TSE_SOME_ID) && te->idcode == ID_OB) {
       if (sync_types->object) {
-        outliner_select_sync_from_object(view_layer, active_data->object, te, tselem);
+        outliner_select_sync_from_object(scene, view_layer, active_data->object, te, tselem);
       }
     }
     else if (tselem->type == TSE_EBONE) {
@@ -514,7 +528,7 @@ static void outliner_sync_selection_to_outliner(ViewLayer *view_layer,
 
     /* Sync subtree elements */
     outliner_sync_selection_to_outliner(
-        view_layer, space_outliner, &te->subtree, active_data, sync_types);
+        scene, view_layer, space_outliner, &te->subtree, active_data, sync_types);
   }
 }
 
@@ -523,7 +537,8 @@ static void get_sync_select_active_data(const bContext *C, SyncSelectActiveData
 {
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  active_data->object = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  active_data->object = BKE_view_layer_active_object_get(view_layer);
   active_data->edit_bone = CTX_data_active_bone(C);
   active_data->pose_channel = CTX_data_active_pose_bone(C);
   active_data->sequence = SEQ_select_active_get(scene);
@@ -537,6 +552,7 @@ void outliner_sync_selection(const bContext *C, SpaceOutliner *space_outliner)
       C, space_outliner, &sync_types);
 
   if (sync_required) {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
 
     /* Store active object, bones, and sequence */
@@ -544,7 +560,7 @@ void outliner_sync_selection(const bContext *C, SpaceOutliner *space_outliner)
     get_sync_select_active_data(C, &active_data);
 
     outliner_sync_selection_to_outliner(
-        view_layer, space_outliner, &space_outliner->tree, &active_data, &sync_types);
+        scene, view_layer, space_outliner, &space_outliner->tree, &active_data, &sync_types);
 
     /* Keep any un-synced data in the dirty flag. */
     if (sync_types.object) {
@@ -561,3 +577,5 @@ void outliner_sync_selection(const bContext *C, SpaceOutliner *space_outliner)
     }
   }
 }
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_tools.cc b/source/blender/editors/space_outliner/outliner_tools.cc
index 7b7182eb106..1628945c4cd 100644
--- a/source/blender/editors/space_outliner/outliner_tools.cc
+++ b/source/blender/editors/space_outliner/outliner_tools.cc
@@ -31,8 +31,11 @@
 
 #include "BLI_blenlib.h"
 #include "BLI_ghash.h"
+#include "BLI_linklist.h"
+#include "BLI_map.hh"
 #include "BLI_set.hh"
 #include "BLI_utildefines.h"
+#include "BLI_vector.hh"
 
 #include "BKE_anim_data.h"
 #include "BKE_animsys.h"
@@ -86,108 +89,111 @@
 #include "tree/tree_element_seq.hh"
 #include "tree/tree_iterator.hh"
 
+namespace blender::ed::outliner {
+
 static CLG_LogRef LOG = {"ed.outliner.tools"};
 
 using namespace blender::ed::outliner;
 
+using blender::Map;
 using blender::Set;
+using blender::Vector;
 
 /* -------------------------------------------------------------------- */
 /** \name ID/Library/Data Set/Un-link Utilities
  * \{ */
 
 static void get_element_operation_type(
-    TreeElement *te, int *scenelevel, int *objectlevel, int *idlevel, int *datalevel)
+    const TreeElement *te, int *scenelevel, int *objectlevel, int *idlevel, int *datalevel)
 {
-  TreeStoreElem *tselem = TREESTORE(te);
-  if (tselem->flag & TSE_SELECTED) {
-    /* Layer collection points to collection ID. */
-    if (!ELEM(tselem->type, TSE_SOME_ID, TSE_LAYER_COLLECTION)) {
-      if (*datalevel == 0) {
-        *datalevel = tselem->type;
-      }
-      else if (*datalevel != tselem->type) {
-        *datalevel = -1;
-      }
-    }
-    else {
-      const int idcode = (int)GS(tselem->id->name);
-      bool is_standard_id = false;
-      switch ((ID_Type)idcode) {
-        case ID_SCE:
-          *scenelevel = 1;
-          break;
-        case ID_OB:
-          *objectlevel = 1;
-          break;
+  *scenelevel = *objectlevel = *idlevel = *datalevel = 0;
 
-        case ID_ME:
-        case ID_CU_LEGACY:
-        case ID_MB:
-        case ID_LT:
-        case ID_LA:
-        case ID_AR:
-        case ID_CA:
-        case ID_SPK:
-        case ID_MA:
-        case ID_TE:
-        case ID_IP:
-        case ID_IM:
-        case ID_SO:
-        case ID_KE:
-        case ID_WO:
-        case ID_AC:
-        case ID_TXT:
-        case ID_GR:
-        case ID_LS:
-        case ID_LI:
-        case ID_VF:
-        case ID_NT:
-        case ID_BR:
-        case ID_PA:
-        case ID_GD:
-        case ID_MC:
-        case ID_MSK:
-        case ID_PAL:
-        case ID_PC:
-        case ID_CF:
-        case ID_WS:
-        case ID_LP:
-        case ID_CV:
-        case ID_PT:
-        case ID_VO:
-        case ID_SIM:
-          is_standard_id = true;
-          break;
-        case ID_WM:
-        case ID_SCR:
-          /* Those are ignored here. */
-          /* NOTE: while Screens should be manageable here, deleting a screen used by a workspace
-           * will cause crashes when trying to use that workspace, so for now let's play minimal,
-           * safe change. */
-          break;
-      }
-      if (idcode == ID_NLA) {
-        /* Fake one, not an actual ID type... */
+  const TreeStoreElem *tselem = TREESTORE(te);
+  if ((tselem->flag & TSE_SELECTED) == 0) {
+    return;
+  }
+
+  /* Layer collection points to collection ID. */
+  if (!ELEM(tselem->type, TSE_SOME_ID, TSE_LAYER_COLLECTION)) {
+    *datalevel = tselem->type;
+  }
+  else {
+    const int idcode = (int)GS(tselem->id->name);
+    bool is_standard_id = false;
+    switch ((ID_Type)idcode) {
+      case ID_SCE:
+        *scenelevel = 1;
+        break;
+      case ID_OB:
+        *objectlevel = 1;
+        break;
+
+      case ID_ME:
+      case ID_CU_LEGACY:
+      case ID_MB:
+      case ID_LT:
+      case ID_LA:
+      case ID_AR:
+      case ID_CA:
+      case ID_SPK:
+      case ID_MA:
+      case ID_TE:
+      case ID_IP:
+      case ID_IM:
+      case ID_SO:
+      case ID_KE:
+      case ID_WO:
+      case ID_AC:
+      case ID_TXT:
+      case ID_GR:
+      case ID_LS:
+      case ID_LI:
+      case ID_VF:
+      case ID_NT:
+      case ID_BR:
+      case ID_PA:
+      case ID_GD:
+      case ID_MC:
+      case ID_MSK:
+      case ID_PAL:
+      case ID_PC:
+      case ID_CF:
+      case ID_WS:
+      case ID_LP:
+      case ID_CV:
+      case ID_PT:
+      case ID_VO:
+      case ID_SIM:
         is_standard_id = true;
-      }
+        break;
+      case ID_WM:
+      case ID_SCR:
+        /* Those are ignored here. */
+        /* NOTE: while Screens should be manageable here, deleting a screen used by a workspace
+         * will cause crashes when trying to use that workspace, so for now let's play minimal,
+         * safe change. */
+        break;
+    }
+    if (idcode == ID_NLA) {
+      /* Fake one, not an actual ID type... */
+      is_standard_id = true;
+    }
 
-      if (is_standard_id) {
-        if (*idlevel == 0) {
-          *idlevel = idcode;
-        }
-        else if (*idlevel != idcode) {
-          *idlevel = -1;
-        }
-        if (ELEM(*datalevel, TSE_VIEW_COLLECTION_BASE, TSE_SCENE_COLLECTION_BASE)) {
-          *datalevel = 0;
-        }
-      }
+    if (is_standard_id) {
+      *idlevel = idcode;
     }
   }
+
+  /* Return values are exclusive, only one may be non-null. */
+  BLI_assert(((*scenelevel != 0) && (*objectlevel == 0) && (*idlevel == 0) && (*datalevel == 0)) ||
+             ((*scenelevel == 0) && (*objectlevel != 0) && (*idlevel == 0) && (*datalevel == 0)) ||
+             ((*scenelevel == 0) && (*objectlevel == 0) && (*idlevel != 0) && (*datalevel == 0)) ||
+             ((*scenelevel == 0) && (*objectlevel == 0) && (*idlevel == 0) && (*datalevel != 0)) ||
+             /* All null. */
+             ((*scenelevel == 0) && (*objectlevel == 0) && (*idlevel == 0) && (*datalevel == 0)));
 }
 
-static TreeElement *get_target_element(SpaceOutliner *space_outliner)
+static TreeElement *get_target_element(const SpaceOutliner *space_outliner)
 {
   TreeElement *te = outliner_find_element_with_flag(&space_outliner->tree, TSE_ACTIVE);
 
@@ -448,6 +454,99 @@ static void outliner_do_libdata_operation(bContext *C,
   });
 }
 
+enum eOutlinerLibOpSelectionSet {
+  /* Only selected items. */
+  OUTLINER_LIB_SELECTIONSET_SELECTED,
+  /* Only content 'inside' selected items (their sub-tree). */
+  OUTLINER_LIB_LIB_SELECTIONSET_CONTENT,
+  /* Combining both options above. */
+  OUTLINER_LIB_LIB_SELECTIONSET_SELECTED_AND_CONTENT,
+};
+
+static const EnumPropertyItem prop_lib_op_selection_set[] = {
+    {OUTLINER_LIB_SELECTIONSET_SELECTED,
+     "SELECTED",
+     0,
+     "Selected",
+     "Apply the operation over selected data-blocks only"},
+    {OUTLINER_LIB_LIB_SELECTIONSET_CONTENT,
+     "CONTENT",
+     0,
+     "Content",
+     "Apply the operation over content of the selected items only (the data-blocks in their "
+     "sub-tree)"},
+    {OUTLINER_LIB_LIB_SELECTIONSET_SELECTED_AND_CONTENT,
+     "SELECTED_AND_CONTENT",
+     0,
+     "Selected & Content",
+     "Apply the operation over selected data-blocks and all their dependencies"},
+    {0, nullptr, 0, nullptr, nullptr},
+};
+
+static void outliner_do_libdata_operation_selection_set(bContext *C,
+                                                        ReportList *reports,
+                                                        Scene *scene,
+                                                        SpaceOutliner *space_outliner,
+                                                        const ListBase &subtree,
+                                                        const bool has_parent_selected,
+                                                        outliner_operation_fn operation_fn,
+                                                        eOutlinerLibOpSelectionSet selection_set,
+                                                        void *user_data)
+{
+  const bool do_selected = ELEM(selection_set,
+                                OUTLINER_LIB_SELECTIONSET_SELECTED,
+                                OUTLINER_LIB_LIB_SELECTIONSET_SELECTED_AND_CONTENT);
+  const bool do_content = ELEM(selection_set,
+                               OUTLINER_LIB_LIB_SELECTIONSET_CONTENT,
+                               OUTLINER_LIB_LIB_SELECTIONSET_SELECTED_AND_CONTENT);
+
+  LISTBASE_FOREACH_MUTABLE (TreeElement *, element, &subtree) {
+    /* Get needed data out in case element gets freed. */
+    TreeStoreElem *tselem = TREESTORE(element);
+    const ListBase subtree = element->subtree;
+
+    bool is_selected = tselem->flag & TSE_SELECTED;
+    if ((is_selected && do_selected) || (has_parent_selected && do_content)) {
+      if (((tselem->type == TSE_SOME_ID) && (element->idcode != 0)) ||
+          tselem->type == TSE_LAYER_COLLECTION) {
+        TreeStoreElem *tsep = element->parent ? TREESTORE(element->parent) : nullptr;
+        operation_fn(C, reports, scene, element, tsep, tselem, user_data);
+      }
+    }
+
+    /* Don't access element from now on, it may be freed. Note that the open/collapsed state may
+     * also have been changed in the visitor callback. */
+    outliner_do_libdata_operation_selection_set(C,
+                                                reports,
+                                                scene,
+                                                space_outliner,
+                                                subtree,
+                                                is_selected || has_parent_selected,
+                                                operation_fn,
+                                                selection_set,
+                                                user_data);
+  }
+}
+
+static void outliner_do_libdata_operation_selection_set(bContext *C,
+                                                        ReportList *reports,
+                                                        Scene *scene,
+                                                        SpaceOutliner *space_outliner,
+                                                        outliner_operation_fn operation_fn,
+                                                        eOutlinerLibOpSelectionSet selection_set,
+                                                        void *user_data)
+{
+  outliner_do_libdata_operation_selection_set(C,
+                                              reports,
+                                              scene,
+                                              space_outliner,
+                                              space_outliner->tree,
+                                              false,
+                                              operation_fn,
+                                              selection_set,
+                                              user_data);
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -683,8 +782,10 @@ static void object_select_fn(bContext *C,
                              TreeStoreElem *tselem,
                              void *UNUSED(user_data))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob = (Object *)tselem->id;
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, ob);
 
   if (base) {
@@ -721,8 +822,10 @@ static void object_deselect_fn(bContext *C,
                                TreeStoreElem *tselem,
                                void *UNUSED(user_data))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *ob = (Object *)tselem->id;
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, ob);
 
   if (base) {
@@ -777,6 +880,25 @@ static void id_local_fn(bContext *C,
   }
 }
 
+struct OutlinerLiboverrideDataIDRoot {
+  /** The linked ID that was selected for override. */
+  ID *id_root_reference;
+
+  /** The root of the override hierarchy to which the override of `id_root` belongs, once
+   * known/created. */
+  ID *id_hierarchy_root_override;
+
+  /** The ID that was detected as being a good candidate as instantiation hint for newly overridden
+   * objects, may be null.
+   *
+   * \note Typically currently only used when the root ID to override is a collection instanced by
+   * an empty object. */
+  ID *id_instance_hint;
+
+  /** If this override comes from an instancing object (which would be `id_instance_hint` then). */
+  bool is_override_instancing_object;
+};
+
 struct OutlinerLibOverrideData {
   bool do_hierarchy;
 
@@ -789,35 +911,82 @@ struct OutlinerLibOverrideData {
    * solving broken overrides while not losing *all* of your overrides. */
   bool do_resync_hierarchy_enforce;
 
-  /** The override hierarchy root, when known/created. */
-  ID *id_hierarchy_root_override;
-
-  /** A hash of the selected tree elements' ID 'uuid'. Used to clear 'system override' flags on
+  /** A set of the selected tree elements' ID 'uuid'. Used to clear 'system override' flags on
    * their newly-created liboverrides in post-process step of override hierarchy creation. */
   Set<uint> selected_id_uid;
+
+  /** A mapping from the found hierarchy roots to a linked list of IDs to override for each of
+   * these roots.
+   *
+   * \note the key may be either linked (in which case it will be replaced by the newly created
+   * override), or an actual already existing override. */
+  Map<ID *, Vector<OutlinerLiboverrideDataIDRoot>> id_hierarchy_roots;
+
+  /** All 'session_uuid' of all hierarchy root IDs used or created by the operation. */
+  Set<uint> id_hierarchy_roots_uid;
+
+  void id_root_add(ID *id_hierarchy_root_reference,
+                   ID *id_root_reference,
+                   ID *id_instance_hint,
+                   const bool is_override_instancing_object)
+  {
+    OutlinerLiboverrideDataIDRoot id_root_data;
+    id_root_data.id_root_reference = id_root_reference;
+    id_root_data.id_hierarchy_root_override = nullptr;
+    id_root_data.id_instance_hint = id_instance_hint;
+    id_root_data.is_override_instancing_object = is_override_instancing_object;
+
+    Vector<OutlinerLiboverrideDataIDRoot> &value = id_hierarchy_roots.lookup_or_add_default(
+        id_hierarchy_root_reference);
+    value.append(id_root_data);
+  }
+  void id_root_set(ID *id_hierarchy_root_reference)
+  {
+    OutlinerLiboverrideDataIDRoot id_root_data;
+    id_root_data.id_root_reference = nullptr;
+    id_root_data.id_hierarchy_root_override = nullptr;
+    id_root_data.id_instance_hint = nullptr;
+    id_root_data.is_override_instancing_object = false;
+
+    Vector<OutlinerLiboverrideDataIDRoot> &value = id_hierarchy_roots.lookup_or_add_default(
+        id_hierarchy_root_reference);
+    if (value.is_empty()) {
+      value.append(id_root_data);
+    }
+  }
 };
 
 /* Store 'UUID' of IDs of selected elements in the Outliner tree, before generating the override
  * hierarchy. */
-static void id_override_library_create_hierarchy_pre_process_fn(bContext *UNUSED(C),
-                                                                ReportList *UNUSED(reports),
+static void id_override_library_create_hierarchy_pre_process_fn(bContext *C,
+                                                                ReportList *reports,
                                                                 Scene *UNUSED(scene),
-                                                                TreeElement *UNUSED(te),
-                                                                TreeStoreElem *UNUSED(tsep),
+                                                                TreeElement *te,
+                                                                TreeStoreElem *tsep,
                                                                 TreeStoreElem *tselem,
                                                                 void *user_data)
 {
   BLI_assert(TSE_IS_REAL_ID(tselem));
 
-  OutlinerLibOverrideData *data = reinterpret_cast<OutlinerLibOverrideData *>(user_data);
+  OutlinerLibOverrideData *data = static_cast<OutlinerLibOverrideData *>(user_data);
   const bool do_hierarchy = data->do_hierarchy;
   ID *id_root_reference = tselem->id;
 
+  if (!BKE_idtype_idcode_is_linkable(GS(id_root_reference->name)) ||
+      (id_root_reference->flag & (LIB_EMBEDDED_DATA | LIB_EMBEDDED_DATA_LIB_OVERRIDE)) != 0) {
+    return;
+  }
+
   BLI_assert(do_hierarchy);
   UNUSED_VARS_NDEBUG(do_hierarchy);
 
   data->selected_id_uid.add(id_root_reference->session_uuid);
 
+  if (ID_IS_OVERRIDE_LIBRARY_REAL(id_root_reference) && !ID_IS_LINKED(id_root_reference)) {
+    id_root_reference->override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
+    return;
+  }
+
   if (GS(id_root_reference->name) == ID_GR && (tselem->flag & TSE_CLOSED) != 0) {
     /* If selected element is a (closed) collection, check all of its objects recursively, and also
      * consider the armature ones as 'selected' (i.e. to not become system overrides). */
@@ -829,28 +998,6 @@ static void id_override_library_create_hierarchy_pre_process_fn(bContext *UNUSED
     }
     FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
   }
-}
-
-static void id_override_library_create_fn(bContext *C,
-                                          ReportList *reports,
-                                          Scene *scene,
-                                          TreeElement *te,
-                                          TreeStoreElem *tsep,
-                                          TreeStoreElem *tselem,
-                                          void *user_data)
-{
-  BLI_assert(TSE_IS_REAL_ID(tselem));
-
-  /* We can only safely apply this operation on one item at a time, so only do it on the active
-   * one. */
-  if ((tselem->flag & TSE_ACTIVE) == 0) {
-    return;
-  }
-
-  ID *id_root_reference = tselem->id;
-  OutlinerLibOverrideData *data = reinterpret_cast<OutlinerLibOverrideData *>(user_data);
-  const bool do_hierarchy = data->do_hierarchy;
-  bool success = false;
 
   ID *id_instance_hint = nullptr;
   bool is_override_instancing_object = false;
@@ -866,195 +1013,259 @@ static void id_override_library_create_fn(bContext *C,
     }
   }
 
-  if (ID_IS_OVERRIDABLE_LIBRARY(id_root_reference) ||
-      (ID_IS_LINKED(id_root_reference) && do_hierarchy)) {
-    Main *bmain = CTX_data_main(C);
+  if (!ID_IS_OVERRIDABLE_LIBRARY(id_root_reference) &&
+      !(ID_IS_LINKED(id_root_reference) && do_hierarchy)) {
+    return;
+  }
 
-    id_root_reference->tag |= LIB_TAG_DOIT;
+  Main *bmain = CTX_data_main(C);
 
-    /* For now, remap all local usages of linked ID to local override one here. */
-    ID *id_iter;
-    FOREACH_MAIN_ID_BEGIN (bmain, id_iter) {
-      if (ID_IS_LINKED(id_iter)) {
-        id_iter->tag &= ~LIB_TAG_DOIT;
-      }
-      else {
-        id_iter->tag |= LIB_TAG_DOIT;
+  if (do_hierarchy) {
+    /* Tag all linked parents in tree hierarchy to be also overridden. */
+    ID *id_hierarchy_root_reference = id_root_reference;
+    while ((te = te->parent) != nullptr) {
+      if (!TSE_IS_REAL_ID(te->store_elem)) {
+        continue;
       }
-    }
-    FOREACH_MAIN_ID_END;
 
-    if (do_hierarchy) {
-      /* Tag all linked parents in tree hierarchy to be also overridden. */
-      ID *id_hierarchy_root_reference = id_root_reference;
-      while ((te = te->parent) != nullptr) {
-        if (!TSE_IS_REAL_ID(te->store_elem)) {
+      /* Tentative hierarchy root. */
+      ID *id_current_hierarchy_root = te->store_elem->id;
+
+      /* If the parent ID is from a different library than the reference root one, we are done
+       * with upwards tree processing in any case. */
+      if (id_current_hierarchy_root->lib != id_root_reference->lib) {
+        if (ID_IS_OVERRIDE_LIBRARY_VIRTUAL(id_current_hierarchy_root)) {
+          /* Virtual overrides (i.e. embedded IDs), we can simply keep processing their parent to
+           * get an actual real override. */
           continue;
         }
 
-        /* Tentative hierarchy root. */
-        ID *id_current_hierarchy_root = te->store_elem->id;
-
-        /* If the parent ID is from a different library than the reference root one, we are done
-         * with upwards tree processing in any case. */
-        if (id_current_hierarchy_root->lib != id_root_reference->lib) {
-          if (ID_IS_OVERRIDE_LIBRARY_VIRTUAL(id_current_hierarchy_root)) {
-            /* Virtual overrides (i.e. embedded IDs), we can simply keep processing their parent to
-             * get an actual real override. */
-            continue;
-          }
-
-          /* If the parent ID is already an override, and is valid (i.e. local override), we can
-           * access its hierarchy root directly. */
-          if (!ID_IS_LINKED(id_current_hierarchy_root) &&
-              ID_IS_OVERRIDE_LIBRARY_REAL(id_current_hierarchy_root) &&
-              id_current_hierarchy_root->override_library->reference->lib ==
-                  id_root_reference->lib) {
-            id_hierarchy_root_reference =
-                id_current_hierarchy_root->override_library->hierarchy_root;
-            BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_reference));
-            break;
-          }
-
-          if (ID_IS_LINKED(id_current_hierarchy_root)) {
-            /* No local 'anchor' was found for the hierarchy to override, do not proceed, as this
-             * would most likely generate invisible/confusing/hard to use and manage overrides. */
-            BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
-            BKE_reportf(reports,
-                        RPT_WARNING,
-                        "Invalid anchor ('%s') found, needed to create library override from "
-                        "data-block '%s'",
-                        id_current_hierarchy_root->name,
-                        id_root_reference->name);
-            return;
-          }
-
-          /* In all other cases, `id_current_hierarchy_root` cannot be a valid hierarchy root, so
-           * current `id_hierarchy_root_reference` is our best candidate. */
-
+        /* If the parent ID is already an override, and is valid (i.e. local override), we can
+         * access its hierarchy root directly. */
+        if (!ID_IS_LINKED(id_current_hierarchy_root) &&
+            ID_IS_OVERRIDE_LIBRARY_REAL(id_current_hierarchy_root) &&
+            id_current_hierarchy_root->override_library->reference->lib ==
+                id_root_reference->lib) {
+          id_hierarchy_root_reference =
+              id_current_hierarchy_root->override_library->hierarchy_root;
+          BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_reference));
           break;
         }
 
-        /* If some element in the tree needs to be overridden, but its ID is not overridable,
-         * abort. */
-        if (!ID_IS_OVERRIDABLE_LIBRARY_HIERARCHY(id_current_hierarchy_root)) {
+        if (ID_IS_LINKED(id_current_hierarchy_root)) {
+          /* No local 'anchor' was found for the hierarchy to override, do not proceed, as this
+           * would most likely generate invisible/confusing/hard to use and manage overrides. */
           BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
           BKE_reportf(reports,
                       RPT_WARNING,
-                      "Could not create library override from data-block '%s', one of its parents "
-                      "is not overridable ('%s')",
-                      id_root_reference->name,
-                      id_current_hierarchy_root->name);
+                      "Invalid anchor ('%s') found, needed to create library override from "
+                      "data-block '%s'",
+                      id_current_hierarchy_root->name,
+                      id_root_reference->name);
           return;
         }
-        id_current_hierarchy_root->tag |= LIB_TAG_DOIT;
-        id_hierarchy_root_reference = id_current_hierarchy_root;
+
+        /* In all other cases, `id_current_hierarchy_root` cannot be a valid hierarchy root, so
+         * current `id_hierarchy_root_reference` is our best candidate. */
+
+        break;
       }
 
-      /* That case can happen when linked data is a complex mix involving several libraries and/or
-       * linked overrides. E.g. a mix of overrides from one library, and indirectly linked data
-       * from another library. Do not try to support such cases for now. */
-      if (!((id_hierarchy_root_reference->lib == id_root_reference->lib) ||
-            (!ID_IS_LINKED(id_hierarchy_root_reference) &&
-             ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_reference) &&
-             id_hierarchy_root_reference->override_library->reference->lib ==
-                 id_root_reference->lib))) {
+      /* If some element in the tree needs to be overridden, but its ID is not overridable,
+       * abort. */
+      if (!ID_IS_OVERRIDABLE_LIBRARY_HIERARCHY(id_current_hierarchy_root)) {
         BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
         BKE_reportf(reports,
                     RPT_WARNING,
-                    "Invalid hierarchy root ('%s') found, needed to create library override from "
-                    "data-block '%s'",
-                    id_hierarchy_root_reference->name,
-                    id_root_reference->name);
+                    "Could not create library override from data-block '%s', one of its parents "
+                    "is not overridable ('%s')",
+                    id_root_reference->name,
+                    id_current_hierarchy_root->name);
         return;
       }
+      id_current_hierarchy_root->tag |= LIB_TAG_DOIT;
+      id_hierarchy_root_reference = id_current_hierarchy_root;
+    }
+
+    /* That case can happen when linked data is a complex mix involving several libraries and/or
+     * linked overrides. E.g. a mix of overrides from one library, and indirectly linked data
+     * from another library. Do not try to support such cases for now. */
+    if (!((id_hierarchy_root_reference->lib == id_root_reference->lib) ||
+          (!ID_IS_LINKED(id_hierarchy_root_reference) &&
+           ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_reference) &&
+           id_hierarchy_root_reference->override_library->reference->lib ==
+               id_root_reference->lib))) {
+      BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
+      BKE_reportf(reports,
+                  RPT_WARNING,
+                  "Invalid hierarchy root ('%s') found, needed to create library override from "
+                  "data-block '%s'",
+                  id_hierarchy_root_reference->name,
+                  id_root_reference->name);
+      return;
+    }
+
+    /* While ideally this should not be needed, in practice user almost _never_ wants to actually
+     * create liboverrides for all data under a selected hierarchy node, and this has currently a
+     * dreadful consequences over performances (since it would call
+     * #BKE_lib_override_library_create over _all_ items in the hierarchy). So only the clearing of
+     * the system override flag is supported for non-selected items for now.
+     */
+    const bool is_selected = tselem->flag & TSE_SELECTED;
+    if (!is_selected && data->id_hierarchy_roots.contains(id_hierarchy_root_reference)) {
+      return;
+    }
+
+    data->id_root_add(id_hierarchy_root_reference,
+                      id_root_reference,
+                      id_instance_hint,
+                      is_override_instancing_object);
+  }
+  else if (ID_IS_OVERRIDABLE_LIBRARY(id_root_reference)) {
+    data->id_root_add(
+        id_root_reference, id_root_reference, id_instance_hint, is_override_instancing_object);
+  }
+}
+
+static void id_override_library_create_hierarchy(
+    Main &bmain,
+    Scene *scene,
+    ViewLayer *view_layer,
+    OutlinerLibOverrideData &data,
+    ID *id_hierarchy_root_reference,
+    Vector<OutlinerLiboverrideDataIDRoot> &data_idroots,
+    bool &r_aggregated_success)
+{
+  BLI_assert(ID_IS_LINKED(id_hierarchy_root_reference) ||
+             ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_reference));
+
+  const bool do_hierarchy = data.do_hierarchy;
+
+  /* NOTE: This process is not the most efficient, but allows to re-use existing code.
+   * If this becomes a bottle-neck at some point, we need to implement a new
+   * `BKE_lib_override_library_hierarchy_create()` function able to process several roots inside of
+   * a same hierarchy in a single call. */
+  for (OutlinerLiboverrideDataIDRoot &data_idroot : data_idroots) {
+    /* For now, remap all local usages of linked ID to local override one here. */
+    ID *id_iter;
+    FOREACH_MAIN_ID_BEGIN (&bmain, id_iter) {
+      if (ID_IS_LINKED(id_iter) || ID_IS_OVERRIDE_LIBRARY(id_iter)) {
+        id_iter->tag &= ~LIB_TAG_DOIT;
+      }
+      else {
+        id_iter->tag |= LIB_TAG_DOIT;
+      }
+    }
+    FOREACH_MAIN_ID_END;
 
+    bool success = false;
+    if (do_hierarchy) {
       ID *id_root_override = nullptr;
-      success = BKE_lib_override_library_create(bmain,
-                                                CTX_data_scene(C),
-                                                CTX_data_view_layer(C),
+      success = BKE_lib_override_library_create(&bmain,
+                                                scene,
+                                                view_layer,
                                                 nullptr,
-                                                id_root_reference,
+                                                data_idroot.id_root_reference,
                                                 id_hierarchy_root_reference,
-                                                id_instance_hint,
+                                                data_idroot.id_instance_hint,
                                                 &id_root_override,
-                                                data->do_fully_editable);
-
-      BLI_assert(id_root_override != nullptr);
-      BLI_assert(!ID_IS_LINKED(id_root_override));
-      BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_root_override));
-      if (ID_IS_LINKED(id_hierarchy_root_reference)) {
-        BLI_assert(
-            id_root_override->override_library->hierarchy_root->override_library->reference ==
-            id_hierarchy_root_reference);
-        data->id_hierarchy_root_override = id_root_override->override_library->hierarchy_root;
-      }
-      else {
-        BLI_assert(id_root_override->override_library->hierarchy_root ==
-                   id_hierarchy_root_reference);
-        data->id_hierarchy_root_override = id_root_override->override_library->hierarchy_root;
+                                                data.do_fully_editable);
+
+      if (success) {
+        BLI_assert(id_root_override != nullptr);
+        BLI_assert(!ID_IS_LINKED(id_root_override));
+        BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_root_override));
+
+        ID *id_hierarchy_root_override = id_root_override->override_library->hierarchy_root;
+        BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_hierarchy_root_override));
+        if (ID_IS_LINKED(id_hierarchy_root_reference)) {
+          BLI_assert(id_hierarchy_root_override->override_library->reference ==
+                     id_hierarchy_root_reference);
+          /* If the hierarchy root reference was a linked data, after the first iteration there is
+           * now a matching override, which shall be used for all further partial overrides with
+           * this same hierarchy. */
+          id_hierarchy_root_reference = id_hierarchy_root_override;
+        }
+        else {
+          BLI_assert(id_hierarchy_root_override == id_hierarchy_root_reference);
+        }
+        data_idroot.id_hierarchy_root_override = id_hierarchy_root_override;
+        data.id_hierarchy_roots_uid.add(id_hierarchy_root_override->session_uuid);
       }
     }
-    else if (ID_IS_OVERRIDABLE_LIBRARY(id_root_reference)) {
-      success = BKE_lib_override_library_create_from_id(bmain, id_root_reference, true) != nullptr;
+    else if (ID_IS_OVERRIDABLE_LIBRARY(data_idroot.id_root_reference)) {
+      ID *id_root_override = BKE_lib_override_library_create_from_id(
+          &bmain, data_idroot.id_root_reference, true);
 
+      success = id_root_override != nullptr;
+      if (success) {
+        BLI_assert(ID_IS_OVERRIDE_LIBRARY_REAL(id_root_override));
+        id_root_override->override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
+      }
       /* Cleanup. */
-      BKE_main_id_newptr_and_tag_clear(bmain);
-      BKE_main_id_tag_all(bmain, LIB_TAG_DOIT, false);
+      BKE_main_id_newptr_and_tag_clear(&bmain);
+      BKE_main_id_tag_all(&bmain, LIB_TAG_DOIT, false);
+    }
+    else {
+      BLI_assert_unreachable();
     }
 
     /* Remove the instance empty from this scene, the items now have an overridden collection
      * instead. */
-    if (success && is_override_instancing_object) {
-      ED_object_base_free_and_unlink(bmain, scene, (Object *)id_instance_hint);
+    if (success && data_idroot.is_override_instancing_object) {
+      BLI_assert(GS(data_idroot.id_instance_hint) == ID_OB);
+      ED_object_base_free_and_unlink(
+          &bmain, scene, reinterpret_cast<Object *>(data_idroot.id_instance_hint));
     }
-  }
-  if (!success) {
-    BKE_reportf(reports,
-                RPT_WARNING,
-                "Could not create library override from data-block '%s'",
-                id_root_reference->name);
+
+    r_aggregated_success = r_aggregated_success && success;
   }
 }
 
 /* Clear system override flag from newly created overrides which linked reference were previously
  * selected in the Outliner tree. */
-static void id_override_library_create_hierarchy_post_process(bContext *C,
-                                                              OutlinerLibOverrideData *data)
+static void id_override_library_create_hierarchy_process(bContext *C,
+                                                         ReportList *reports,
+                                                         OutlinerLibOverrideData &data)
 {
   Main *bmain = CTX_data_main(C);
-  ID *id_hierarchy_root_override = data->id_hierarchy_root_override;
+  Scene *scene = CTX_data_scene(C);
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  const bool do_hierarchy = data.do_hierarchy;
+
+  bool success = true;
+  for (auto &&[id_hierarchy_root_reference, data_idroots] : data.id_hierarchy_roots.items()) {
+    id_override_library_create_hierarchy(
+        *bmain, scene, view_layer, data, id_hierarchy_root_reference, data_idroots, success);
+  }
+
+  if (!success) {
+    BKE_reportf(reports,
+                RPT_WARNING,
+                "Could not create library override from one or more of the selected data-blocks");
+  }
+
+  if (!do_hierarchy) {
+    return;
+  }
 
   ID *id_iter;
   FOREACH_MAIN_ID_BEGIN (bmain, id_iter) {
-    if (ID_IS_LINKED(id_iter) || !ID_IS_OVERRIDE_LIBRARY_REAL(id_iter) ||
-        id_iter->override_library->hierarchy_root != id_hierarchy_root_override) {
+    if (ID_IS_LINKED(id_iter) || !ID_IS_OVERRIDE_LIBRARY_REAL(id_iter)) {
       continue;
     }
-    if (data->selected_id_uid.contains(id_iter->override_library->reference->session_uuid)) {
+    if (!data.id_hierarchy_roots_uid.contains(
+            id_iter->override_library->hierarchy_root->session_uuid)) {
+      continue;
+    }
+    if (data.selected_id_uid.contains(id_iter->override_library->reference->session_uuid) ||
+        data.selected_id_uid.contains(id_iter->session_uuid)) {
       id_iter->override_library->flag &= ~IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED;
     }
   }
   FOREACH_MAIN_ID_END;
 }
 
-static void id_override_library_toggle_flag_fn(bContext *UNUSED(C),
-                                               ReportList *UNUSED(reports),
-                                               Scene *UNUSED(scene),
-                                               TreeElement *UNUSED(te),
-                                               TreeStoreElem *UNUSED(tsep),
-                                               TreeStoreElem *tselem,
-                                               void *user_data)
-{
-  BLI_assert(TSE_IS_REAL_ID(tselem));
-  ID *id = tselem->id;
-
-  if (ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
-    const uint flag = POINTER_AS_UINT(user_data);
-    id->override_library->flag ^= flag;
-  }
-}
-
 static void id_override_library_reset_fn(bContext *C,
                                          ReportList *UNUSED(reports),
                                          Scene *UNUSED(scene),
@@ -1065,137 +1276,158 @@ static void id_override_library_reset_fn(bContext *C,
 {
   BLI_assert(TSE_IS_REAL_ID(tselem));
   ID *id_root = tselem->id;
-  OutlinerLibOverrideData *data = reinterpret_cast<OutlinerLibOverrideData *>(user_data);
+  OutlinerLibOverrideData *data = static_cast<OutlinerLibOverrideData *>(user_data);
   const bool do_hierarchy = data->do_hierarchy;
 
-  if (ID_IS_OVERRIDE_LIBRARY_REAL(id_root)) {
-    Main *bmain = CTX_data_main(C);
+  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id_root) || ID_IS_LINKED(id_root)) {
+    CLOG_WARN(&LOG, "Could not reset library override of data block '%s'", id_root->name);
+    return;
+  }
 
-    if (do_hierarchy) {
-      BKE_lib_override_library_id_hierarchy_reset(bmain, id_root, false);
-    }
-    else {
-      BKE_lib_override_library_id_reset(bmain, id_root, false);
-    }
+  Main *bmain = CTX_data_main(C);
 
-    WM_event_add_notifier(C, NC_WM | ND_DATACHANGED, nullptr);
-    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
+  if (do_hierarchy) {
+    BKE_lib_override_library_id_hierarchy_reset(bmain, id_root, false);
   }
   else {
-    CLOG_WARN(&LOG, "Could not reset library override of data block '%s'", id_root->name);
+    BKE_lib_override_library_id_reset(bmain, id_root, false);
   }
 }
 
-static void id_override_library_resync_fn(bContext *C,
-                                          ReportList *reports,
-                                          Scene *scene,
-                                          TreeElement *te,
-                                          TreeStoreElem *UNUSED(tsep),
-                                          TreeStoreElem *tselem,
-                                          void *user_data)
+static void id_override_library_clear_single_fn(bContext *C,
+                                                ReportList *reports,
+                                                Scene *scene,
+                                                TreeElement *UNUSED(te),
+                                                TreeStoreElem *UNUSED(tsep),
+                                                TreeStoreElem *tselem,
+                                                void *UNUSED(user_data))
 {
   BLI_assert(TSE_IS_REAL_ID(tselem));
-  ID *id_root = tselem->id;
-  OutlinerLibOverrideData *data = reinterpret_cast<OutlinerLibOverrideData *>(user_data);
-  const bool do_hierarchy_enforce = data->do_resync_hierarchy_enforce;
-
-  if (ID_IS_OVERRIDE_LIBRARY_REAL(id_root)) {
-    Main *bmain = CTX_data_main(C);
+  Main *bmain = CTX_data_main(C);
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  ID *id = tselem->id;
 
-    id_root->tag |= LIB_TAG_DOIT;
+  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id) || ID_IS_LINKED(id)) {
+    BKE_reportf(reports,
+                RPT_WARNING,
+                "Cannot clear embedded library override id '%s', only overrides of real "
+                "data-blocks can be directly deleted",
+                id->name);
+    return;
+  }
 
-    /* Tag all linked parents in tree hierarchy to be also overridden. */
-    while ((te = te->parent) != nullptr) {
-      if (!TSE_IS_REAL_ID(te->store_elem)) {
-        continue;
-      }
-      if (!ID_IS_OVERRIDE_LIBRARY_REAL(te->store_elem->id)) {
-        break;
+  /* If given ID is not using any other override (it's a 'leaf' in the override hierarchy),
+   * delete it and remap its usages to its linked reference. Otherwise, keep it as a reset system
+   * override. */
+  if (BKE_lib_override_library_is_hierarchy_leaf(bmain, id)) {
+    bool do_remap_active = false;
+    BKE_view_layer_synced_ensure(CTX_data_scene(C), view_layer);
+    if (BKE_view_layer_active_object_get(view_layer) == reinterpret_cast<Object *>(id)) {
+      BLI_assert(GS(id->name) == ID_OB);
+      do_remap_active = true;
+    }
+    BKE_libblock_remap(bmain, id, id->override_library->reference, ID_REMAP_SKIP_INDIRECT_USAGE);
+    if (do_remap_active) {
+      Object *ref_object = reinterpret_cast<Object *>(id->override_library->reference);
+      Base *basact = BKE_view_layer_base_find(view_layer, ref_object);
+      if (basact != nullptr) {
+        view_layer->basact = basact;
       }
-      te->store_elem->id->tag |= LIB_TAG_DOIT;
+      DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     }
-
-    BlendFileReadReport report{};
-    report.reports = reports;
-    BKE_lib_override_library_resync(
-        bmain, scene, CTX_data_view_layer(C), id_root, nullptr, do_hierarchy_enforce, &report);
-
-    WM_event_add_notifier(C, NC_WINDOW, nullptr);
+    BKE_id_delete(bmain, id);
   }
   else {
-    CLOG_WARN(&LOG, "Could not resync library override of data block '%s'", id_root->name);
+    BKE_lib_override_library_id_reset(bmain, id, true);
   }
+
+  DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS | ID_RECALC_COPY_ON_WRITE);
 }
 
-static void id_override_library_clear_hierarchy_fn(bContext *C,
-                                                   ReportList *UNUSED(reports),
-                                                   Scene *UNUSED(scene),
-                                                   TreeElement *te,
-                                                   TreeStoreElem *UNUSED(tsep),
-                                                   TreeStoreElem *tselem,
-                                                   void *UNUSED(user_data))
+static void id_override_library_resync_fn(bContext *UNUSED(C),
+                                          ReportList *UNUSED(reports),
+                                          Scene *UNUSED(scene),
+                                          TreeElement *UNUSED(te),
+                                          TreeStoreElem *UNUSED(tsep),
+                                          TreeStoreElem *tselem,
+                                          void *user_data)
 {
   BLI_assert(TSE_IS_REAL_ID(tselem));
   ID *id_root = tselem->id;
+  OutlinerLibOverrideData *data = static_cast<OutlinerLibOverrideData *>(user_data);
 
-  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id_root)) {
-    CLOG_WARN(&LOG, "Could not delete library override of data block '%s'", id_root->name);
+  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id_root) || ID_IS_LINKED(id_root)) {
+    CLOG_WARN(&LOG, "Could not resync library override of data block '%s'", id_root->name);
     return;
   }
 
+  if (id_root->override_library->hierarchy_root != nullptr) {
+    id_root = id_root->override_library->hierarchy_root;
+  }
+
+  data->id_root_set(id_root);
+}
+
+/* Resync a hierarchy of library overrides. */
+static void id_override_library_resync_hierarchy_process(bContext *C,
+                                                         ReportList *reports,
+                                                         OutlinerLibOverrideData &data)
+{
   Main *bmain = CTX_data_main(C);
+  Scene *scene = CTX_data_scene(C);
+  const bool do_hierarchy_enforce = data.do_resync_hierarchy_enforce;
 
-  id_root->tag |= LIB_TAG_DOIT;
+  BlendFileReadReport report{};
+  report.reports = reports;
 
-  /* Tag all override parents in tree hierarchy to be also processed. */
-  while ((te = te->parent) != nullptr) {
-    if (!TSE_IS_REAL_ID(te->store_elem)) {
-      continue;
-    }
-    if (!ID_IS_OVERRIDE_LIBRARY_REAL(te->store_elem->id)) {
-      break;
-    }
-    te->store_elem->id->tag |= LIB_TAG_DOIT;
+  for (auto &&id_hierarchy_root : data.id_hierarchy_roots.keys()) {
+    BKE_lib_override_library_resync(bmain,
+                                    scene,
+                                    CTX_data_view_layer(C),
+                                    id_hierarchy_root,
+                                    nullptr,
+                                    do_hierarchy_enforce,
+                                    &report);
   }
 
-  BKE_lib_override_library_delete(bmain, id_root);
-
   WM_event_add_notifier(C, NC_WINDOW, nullptr);
 }
 
-static void id_override_library_clear_single_fn(bContext *C,
-                                                ReportList *reports,
-                                                Scene *UNUSED(scene),
-                                                TreeElement *UNUSED(te),
-                                                TreeStoreElem *UNUSED(tsep),
-                                                TreeStoreElem *tselem,
-                                                void *UNUSED(user_data))
+static void id_override_library_delete_hierarchy_fn(bContext *UNUSED(C),
+                                                    ReportList *UNUSED(reports),
+                                                    Scene *UNUSED(scene),
+                                                    TreeElement *UNUSED(te),
+                                                    TreeStoreElem *UNUSED(tsep),
+                                                    TreeStoreElem *tselem,
+                                                    void *user_data)
 {
+  OutlinerLibOverrideData *data = reinterpret_cast<OutlinerLibOverrideData *>(user_data);
+
   BLI_assert(TSE_IS_REAL_ID(tselem));
-  Main *bmain = CTX_data_main(C);
-  ID *id = tselem->id;
+  ID *id_root = tselem->id;
 
-  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
-    BKE_reportf(reports,
-                RPT_WARNING,
-                "Cannot clear embedded library override id '%s', only overrides of real "
-                "data-blocks can be directly deleted",
-                id->name);
+  if (!ID_IS_OVERRIDE_LIBRARY_REAL(id_root) || ID_IS_LINKED(id_root)) {
+    CLOG_WARN(&LOG, "Could not delete library override of data block '%s'", id_root->name);
     return;
   }
 
-  /* If given ID is not using any other override (it's a 'leaf' in the override hierarchy),
-   * delete it and remap its usages to its linked reference. Otherwise, keep it as a reset system
-   * override. */
-  if (BKE_lib_override_library_is_hierarchy_leaf(bmain, id)) {
-    BKE_libblock_remap(bmain, id, id->override_library->reference, ID_REMAP_SKIP_INDIRECT_USAGE);
-    BKE_id_delete(bmain, id);
-  }
-  else {
-    BKE_lib_override_library_id_reset(bmain, id, true);
+  if (id_root->override_library->hierarchy_root != nullptr) {
+    id_root = id_root->override_library->hierarchy_root;
   }
 
-  WM_event_add_notifier(C, NC_WINDOW, nullptr);
+  data->id_root_set(id_root);
+}
+
+/* Clear (delete) a hierarchy of library overrides. */
+static void id_override_library_delete_hierarchy_process(bContext *C,
+                                                         ReportList *UNUSED(reports),
+                                                         OutlinerLibOverrideData &data)
+{
+  Main *bmain = CTX_data_main(C);
+
+  for (auto &&id_hierarchy_root : data.id_hierarchy_roots.keys()) {
+    BKE_lib_override_library_delete(bmain, id_hierarchy_root);
+  }
 }
 
 static void id_fake_user_set_fn(bContext *UNUSED(C),
@@ -1399,6 +1631,247 @@ static void refreshdrivers_animdata_fn(int UNUSED(event),
 /** \} */
 
 /* -------------------------------------------------------------------- */
+/** \name Library Overrides Operation Menu.
+ * \{ */
+
+enum eOutlinerLibOverrideOpTypes {
+  OUTLINER_LIBOVERRIDE_OP_INVALID = 0,
+
+  OUTLINER_LIBOVERRIDE_OP_CREATE_HIERARCHY,
+  OUTLINER_LIBOVERRIDE_OP_RESET,
+  OUTLINER_LIBOVERRIDE_OP_CLEAR_SINGLE,
+
+  OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY,
+  OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY_ENFORCE,
+  OUTLINER_LIBOVERRIDE_OP_DELETE_HIERARCHY,
+};
+
+static const EnumPropertyItem prop_liboverride_op_types[] = {
+    {OUTLINER_LIBOVERRIDE_OP_CREATE_HIERARCHY,
+     "OVERRIDE_LIBRARY_CREATE_HIERARCHY",
+     0,
+     "Make",
+     "Create a local override of the selected linked data-blocks, and their hierarchy of "
+     "dependencies"},
+    {OUTLINER_LIBOVERRIDE_OP_RESET,
+     "OVERRIDE_LIBRARY_RESET",
+     0,
+     "Reset",
+     "Reset the selected local overrides to their linked references values"},
+    {OUTLINER_LIBOVERRIDE_OP_CLEAR_SINGLE,
+     "OVERRIDE_LIBRARY_CLEAR_SINGLE",
+     0,
+     "Clear",
+     "Delete the selected local overrides and relink their usages to the linked data-blocks if "
+     "possible, else reset them and mark them as non editable"},
+    {0, nullptr, 0, nullptr, nullptr},
+};
+
+static const EnumPropertyItem prop_liboverride_troubleshoot_op_types[] = {
+    {OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY,
+     "OVERRIDE_LIBRARY_RESYNC_HIERARCHY",
+     0,
+     "Resync",
+     "Rebuild the selected local overrides from their linked references, as well as their "
+     "hierarchies of dependencies"},
+    {OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY_ENFORCE,
+     "OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE",
+     0,
+     "Resync Enforce",
+     "Rebuild the selected local overrides from their linked references, as well as their "
+     "hierarchies of dependencies, enforcing these hierarchies to match the linked data (i.e. "
+     "ignoring existing overrides on data-blocks pointer properties)"},
+    RNA_ENUM_ITEM_SEPR,
+    {OUTLINER_LIBOVERRIDE_OP_DELETE_HIERARCHY,
+     "OVERRIDE_LIBRARY_DELETE_HIERARCHY",
+     0,
+     "Delete",
+     "Delete the selected local overrides (including their hierarchies of override dependencies) "
+     "and relink their usages to the linked data-blocks"},
+    {0, nullptr, 0, nullptr, nullptr},
+};
+
+static bool outliner_liboverride_operation_poll(bContext *C)
+{
+  if (!outliner_operation_tree_element_poll(C)) {
+    return false;
+  }
+  return true;
+}
+
+static int outliner_liboverride_operation_exec(bContext *C, wmOperator *op)
+{
+  Scene *scene = CTX_data_scene(C);
+  SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
+
+  /* check for invalid states */
+  if (space_outliner == nullptr) {
+    return OPERATOR_CANCELLED;
+  }
+
+  const eOutlinerLibOpSelectionSet selection_set = static_cast<eOutlinerLibOpSelectionSet>(
+      RNA_enum_get(op->ptr, "selection_set"));
+  const eOutlinerLibOverrideOpTypes event = static_cast<eOutlinerLibOverrideOpTypes>(
+      RNA_enum_get(op->ptr, "type"));
+  switch (event) {
+    case OUTLINER_LIBOVERRIDE_OP_CREATE_HIERARCHY: {
+      OutlinerLibOverrideData override_data{};
+      override_data.do_hierarchy = true;
+      override_data.do_fully_editable = false;
+
+      outliner_do_libdata_operation_selection_set(
+          C,
+          op->reports,
+          scene,
+          space_outliner,
+          id_override_library_create_hierarchy_pre_process_fn,
+          selection_set,
+          &override_data);
+
+      id_override_library_create_hierarchy_process(C, op->reports, override_data);
+
+      ED_undo_push(C, "Overridden Data Hierarchy");
+      break;
+    }
+    case OUTLINER_LIBOVERRIDE_OP_RESET: {
+      OutlinerLibOverrideData override_data{};
+      outliner_do_libdata_operation_selection_set(C,
+                                                  op->reports,
+                                                  scene,
+                                                  space_outliner,
+                                                  id_override_library_reset_fn,
+                                                  selection_set,
+                                                  &override_data);
+      ED_undo_push(C, "Reset Overridden Data");
+      break;
+    }
+    case OUTLINER_LIBOVERRIDE_OP_CLEAR_SINGLE: {
+      outliner_do_libdata_operation_selection_set(C,
+                                                  op->reports,
+                                                  scene,
+                                                  space_outliner,
+                                                  id_override_library_clear_single_fn,
+                                                  selection_set,
+                                                  nullptr);
+      ED_undo_push(C, "Clear Overridden Data");
+      break;
+    }
+
+    case OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY: {
+      OutlinerLibOverrideData override_data{};
+      override_data.do_hierarchy = true;
+      outliner_do_libdata_operation_selection_set(C,
+                                                  op->reports,
+                                                  scene,
+                                                  space_outliner,
+                                                  id_override_library_resync_fn,
+                                                  OUTLINER_LIB_SELECTIONSET_SELECTED,
+                                                  &override_data);
+
+      id_override_library_resync_hierarchy_process(C, op->reports, override_data);
+
+      ED_undo_push(C, "Resync Overridden Data Hierarchy");
+      break;
+    }
+    case OUTLINER_LIBOVERRIDE_OP_RESYNC_HIERARCHY_ENFORCE: {
+      OutlinerLibOverrideData override_data{};
+      override_data.do_hierarchy = true;
+      override_data.do_resync_hierarchy_enforce = true;
+      outliner_do_libdata_operation_selection_set(C,
+                                                  op->reports,
+                                                  scene,
+                                                  space_outliner,
+                                                  id_override_library_resync_fn,
+                                                  OUTLINER_LIB_SELECTIONSET_SELECTED,
+                                                  &override_data);
+
+      id_override_library_resync_hierarchy_process(C, op->reports, override_data);
+
+      ED_undo_push(C, "Resync Overridden Data Hierarchy Enforce");
+      break;
+    }
+    case OUTLINER_LIBOVERRIDE_OP_DELETE_HIERARCHY: {
+      OutlinerLibOverrideData override_data{};
+      override_data.do_hierarchy = true;
+      outliner_do_libdata_operation_selection_set(C,
+                                                  op->reports,
+                                                  scene,
+                                                  space_outliner,
+                                                  id_override_library_delete_hierarchy_fn,
+                                                  OUTLINER_LIB_SELECTIONSET_SELECTED,
+                                                  nullptr);
+
+      id_override_library_delete_hierarchy_process(C, op->reports, override_data);
+
+      ED_undo_push(C, "Delete Overridden Data Hierarchy");
+      break;
+    }
+    default:
+      /* Invalid - unhandled. */
+      break;
+  }
+
+  WM_event_add_notifier(C, NC_WINDOW, nullptr);
+  WM_event_add_notifier(C, NC_WM | ND_LIB_OVERRIDE_CHANGED, nullptr);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, nullptr);
+
+  return OPERATOR_FINISHED;
+}
+
+void OUTLINER_OT_liboverride_operation(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Outliner Library Override Operation";
+  ot->idname = "OUTLINER_OT_liboverride_operation";
+  ot->description = "Create, reset or clear library override hierarchies";
+
+  /* callbacks */
+  ot->invoke = WM_menu_invoke;
+  ot->exec = outliner_liboverride_operation_exec;
+  ot->poll = outliner_liboverride_operation_poll;
+
+  ot->flag = 0;
+
+  RNA_def_enum(ot->srna, "type", prop_liboverride_op_types, 0, "Library Override Operation", "");
+  ot->prop = RNA_def_enum(ot->srna,
+                          "selection_set",
+                          prop_lib_op_selection_set,
+                          0,
+                          "Selection Set",
+                          "Over which part of the tree items to apply the operation");
+}
+
+void OUTLINER_OT_liboverride_troubleshoot_operation(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Outliner Library Override Troubleshoot Operation";
+  ot->idname = "OUTLINER_OT_liboverride_troubleshoot_operation";
+  ot->description = "Advanced operations over library override to help fix broken hierarchies";
+
+  /* callbacks */
+  ot->invoke = WM_menu_invoke;
+  ot->exec = outliner_liboverride_operation_exec;
+  ot->poll = outliner_liboverride_operation_poll;
+
+  ot->flag = 0;
+
+  ot->prop = RNA_def_enum(ot->srna,
+                          "type",
+                          prop_liboverride_troubleshoot_op_types,
+                          0,
+                          "Library Override Troubleshoot Operation",
+                          "");
+  RNA_def_enum(ot->srna,
+               "selection_set",
+               prop_lib_op_selection_set,
+               0,
+               "Selection Set",
+               "Over which part of the tree items to apply the operation");
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
 /** \name Object Operation Utilities
  * \{ */
 
@@ -1542,7 +2015,7 @@ static void data_select_linked_fn(int event,
     const PointerRNA &ptr = te_rna_struct->getPointerRNA();
     if (RNA_struct_is_ID(ptr.type)) {
       bContext *C = (bContext *)C_v;
-      ID *id = reinterpret_cast<ID *>(ptr.data);
+      ID *id = static_cast<ID *>(ptr.data);
 
       ED_object_select_linked_by_id(C, id);
     }
@@ -1551,7 +2024,7 @@ static void data_select_linked_fn(int event,
 
 static void constraint_fn(int event, TreeElement *te, TreeStoreElem *UNUSED(tselem), void *C_v)
 {
-  bContext *C = reinterpret_cast<bContext *>(C_v);
+  bContext *C = static_cast<bContext *>(C_v);
   Main *bmain = CTX_data_main(C);
   bConstraint *constraint = (bConstraint *)te->directdata;
   Object *ob = (Object *)outliner_search_back(te, ID_OB);
@@ -1640,9 +2113,10 @@ static Base *outliner_batch_delete_hierarchy(
   if (!base) {
     return nullptr;
   }
-
+  BKE_view_layer_synced_ensure(scene, view_layer);
   object = base->object;
-  for (child_base = reinterpret_cast<Base *>(view_layer->object_bases.first); child_base;
+  for (child_base = static_cast<Base *>(BKE_view_layer_object_bases_get(view_layer)->first);
+       child_base;
        child_base = base_next) {
     base_next = child_base->next;
     for (parent = child_base->object->parent; parent && (parent != object);
@@ -1692,6 +2166,7 @@ static void object_batch_delete_hierarchy_fn(bContext *C,
   ViewLayer *view_layer = CTX_data_view_layer(C);
   Object *obedit = CTX_data_edit_object(C);
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, ob);
 
   if (base) {
@@ -1863,9 +2338,9 @@ static void outliner_do_object_delete(bContext *C,
   }
 }
 
-static TreeTraversalAction outliner_find_objects_to_delete(TreeElement *te, void *customdata)
+static TreeTraversalAction outliner_collect_objects_to_delete(TreeElement *te, void *customdata)
 {
-  ObjectEditData *data = reinterpret_cast<ObjectEditData *>(customdata);
+  ObjectEditData *data = static_cast<ObjectEditData *>(customdata);
   GSet *objects_to_delete = data->objects_set;
   TreeStoreElem *tselem = TREESTORE(te);
 
@@ -1878,6 +2353,17 @@ static TreeTraversalAction outliner_find_objects_to_delete(TreeElement *te, void
     return TRAVERSE_SKIP_CHILDS;
   }
 
+  /* Do not allow to delete children objects of an override collection. */
+  TreeElement *te_parent = te->parent;
+  if (outliner_is_collection_tree_element(te_parent)) {
+    TreeStoreElem *tselem_parent = TREESTORE(te_parent);
+    ID *id_parent = tselem_parent->id;
+    BLI_assert(GS(id_parent->name) == ID_GR);
+    if (ID_IS_OVERRIDE_LIBRARY_REAL(id_parent)) {
+      return TRAVERSE_SKIP_CHILDS;
+    }
+  }
+
   ID *id = tselem->id;
 
   if (ID_IS_OVERRIDE_LIBRARY_REAL(id)) {
@@ -1905,7 +2391,8 @@ static int outliner_delete_exec(bContext *C, wmOperator *op)
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
   struct wmMsgBus *mbus = CTX_wm_message_bus(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  const Base *basact_prev = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Base *basact_prev = BKE_view_layer_active_base_get(view_layer);
 
   const bool delete_hierarchy = RNA_boolean_get(op->ptr, "hierarchy");
 
@@ -1919,7 +2406,7 @@ static int outliner_delete_exec(bContext *C, wmOperator *op)
                          &space_outliner->tree,
                          0,
                          TSE_SELECTED,
-                         outliner_find_objects_to_delete,
+                         outliner_collect_objects_to_delete,
                          &object_delete_data);
 
   if (delete_hierarchy) {
@@ -1949,7 +2436,8 @@ static int outliner_delete_exec(bContext *C, wmOperator *op)
   DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(bmain);
 
-  if (basact_prev != BASACT(view_layer)) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  if (basact_prev != BKE_view_layer_active_base_get(view_layer)) {
     WM_event_add_notifier(C, NC_SCENE | ND_OB_ACTIVE, scene);
     WM_msg_publish_rna_prop(mbus, &scene->id, view_layer, LayerObjects, active);
   }
@@ -1993,15 +2481,6 @@ enum eOutlinerIdOpTypes {
 
   OUTLINER_IDOP_UNLINK,
   OUTLINER_IDOP_LOCAL,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE_HIERARCHY,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_MAKE_EDITABLE,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET_HIERARCHY,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_HIERARCHY,
-  OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_SINGLE,
   OUTLINER_IDOP_SINGLE,
   OUTLINER_IDOP_DELETE,
   OUTLINER_IDOP_REMAP,
@@ -2028,59 +2507,6 @@ static const EnumPropertyItem prop_id_op_types[] = {
      "Remap Users",
      "Make all users of selected data-blocks to use instead current (clicked) one"},
     RNA_ENUM_ITEM_SEPR,
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE,
-     "OVERRIDE_LIBRARY_CREATE",
-     0,
-     "Make Library Override Single",
-     "Make a single, out-of-hierarchy local override of this linked data-block - only applies to "
-     "active Outliner item"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE_HIERARCHY,
-     "OVERRIDE_LIBRARY_CREATE_HIERARCHY",
-     0,
-     "Make Library Override Hierarchy",
-     "Make a local override of this linked data-block, and its hierarchy of dependencies - only "
-     "applies to active Outliner item"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_MAKE_EDITABLE,
-     "OVERRIDE_LIBRARY_MAKE_EDITABLE",
-     0,
-     "Make Library Override Editable",
-     "Make the library override data-block editable"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET,
-     "OVERRIDE_LIBRARY_RESET",
-     0,
-     "Reset Library Override Single",
-     "Reset this local override to its linked values"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET_HIERARCHY,
-     "OVERRIDE_LIBRARY_RESET_HIERARCHY",
-     0,
-     "Reset Library Override Hierarchy",
-     "Reset this local override to its linked values, as well as its hierarchy of dependencies"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY,
-     "OVERRIDE_LIBRARY_RESYNC_HIERARCHY",
-     0,
-     "Resync Library Override Hierarchy",
-     "Rebuild this local override from its linked reference, as well as its hierarchy of "
-     "dependencies"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE,
-     "OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE",
-     0,
-     "Resync Library Override Hierarchy Enforce",
-     "Rebuild this local override from its linked reference, as well as its hierarchy of "
-     "dependencies, enforcing that hierarchy to match the linked data (i.e. ignoring exiting "
-     "overrides on data-blocks pointer properties)"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_SINGLE,
-     "OVERRIDE_LIBRARY_CLEAR_SINGLE",
-     0,
-     "Clear Library Override Single",
-     "Delete this local override and relink its usages to the linked data-blocks if possible, "
-     "else reset it and mark it as non editable"},
-    {OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_HIERARCHY,
-     "OVERRIDE_LIBRARY_CLEAR_HIERARCHY",
-     0,
-     "Clear Library Override Hierarchy",
-     "Delete this local override (including its hierarchy of override dependencies) and relink "
-     "its usages to the linked data-blocks"},
-    RNA_ENUM_ITEM_SEPR,
     {OUTLINER_IDOP_COPY, "COPY", ICON_COPYDOWN, "Copy", ""},
     {OUTLINER_IDOP_PASTE, "PASTE", ICON_PASTEDOWN, "Paste", ""},
     RNA_ENUM_ITEM_SEPR,
@@ -2113,33 +2539,6 @@ static bool outliner_id_operation_item_poll(bContext *C,
   }
 
   switch (enum_value) {
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE:
-      if (ID_IS_OVERRIDABLE_LIBRARY(tselem->id)) {
-        return true;
-      }
-      return false;
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE_HIERARCHY:
-      if (ID_IS_OVERRIDABLE_LIBRARY(tselem->id) || (ID_IS_LINKED(tselem->id))) {
-        return true;
-      }
-      return false;
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_MAKE_EDITABLE:
-      if (ID_IS_OVERRIDE_LIBRARY_REAL(tselem->id) && !ID_IS_LINKED(tselem->id)) {
-        if (tselem->id->override_library->flag & IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED) {
-          return true;
-        }
-      }
-      return false;
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET:
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET_HIERARCHY:
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY:
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE:
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_HIERARCHY:
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_SINGLE:
-      if (ID_IS_OVERRIDE_LIBRARY_REAL(tselem->id) && !ID_IS_LINKED(tselem->id)) {
-        return true;
-      }
-      return false;
     case OUTLINER_IDOP_SINGLE:
       if (ELEM(space_outliner->outlinevis, SO_SCENES, SO_VIEW_LAYER)) {
         return true;
@@ -2252,85 +2651,6 @@ static int outliner_id_operation_exec(bContext *C, wmOperator *op)
       ED_undo_push(C, "Localized Data");
       break;
     }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE: {
-      OutlinerLibOverrideData override_data{};
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_create_fn, &override_data);
-      ED_undo_push(C, "Overridden Data");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CREATE_HIERARCHY: {
-      OutlinerLibOverrideData override_data{};
-      override_data.do_hierarchy = true;
-      override_data.do_fully_editable = U.experimental.use_override_new_fully_editable;
-      outliner_do_libdata_operation(C,
-                                    op->reports,
-                                    scene,
-                                    space_outliner,
-                                    id_override_library_create_hierarchy_pre_process_fn,
-                                    &override_data);
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_create_fn, &override_data);
-      id_override_library_create_hierarchy_post_process(C, &override_data);
-
-      ED_undo_push(C, "Overridden Data Hierarchy");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_MAKE_EDITABLE: {
-      outliner_do_libdata_operation(C,
-                                    op->reports,
-                                    scene,
-                                    space_outliner,
-                                    id_override_library_toggle_flag_fn,
-                                    POINTER_FROM_UINT(IDOVERRIDE_LIBRARY_FLAG_SYSTEM_DEFINED));
-
-      ED_undo_push(C, "Make Overridden Data Editable");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET: {
-      OutlinerLibOverrideData override_data{};
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_reset_fn, &override_data);
-      ED_undo_push(C, "Reset Overridden Data");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESET_HIERARCHY: {
-      OutlinerLibOverrideData override_data{};
-      override_data.do_hierarchy = true;
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_reset_fn, &override_data);
-      ED_undo_push(C, "Reset Overridden Data Hierarchy");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY: {
-      OutlinerLibOverrideData override_data{};
-      override_data.do_hierarchy = true;
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_resync_fn, &override_data);
-      ED_undo_push(C, "Resync Overridden Data Hierarchy");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_RESYNC_HIERARCHY_ENFORCE: {
-      OutlinerLibOverrideData override_data{};
-      override_data.do_hierarchy = true;
-      override_data.do_resync_hierarchy_enforce = true;
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_resync_fn, &override_data);
-      ED_undo_push(C, "Resync Overridden Data Hierarchy");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_HIERARCHY: {
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_clear_hierarchy_fn, nullptr);
-      ED_undo_push(C, "Clear Overridden Data Hierarchy");
-      break;
-    }
-    case OUTLINER_IDOP_OVERRIDE_LIBRARY_CLEAR_SINGLE: {
-      outliner_do_libdata_operation(
-          C, op->reports, scene, space_outliner, id_override_library_clear_single_fn, nullptr);
-      ED_undo_push(C, "Clear Overridden Data Hierarchy");
-      break;
-    }
     case OUTLINER_IDOP_SINGLE: {
       /* make single user */
       switch (idlevel) {
@@ -2442,6 +2762,7 @@ void OUTLINER_OT_id_operation(wmOperatorType *ot)
   /* identifiers */
   ot->name = "Outliner ID Data Operation";
   ot->idname = "OUTLINER_OT_id_operation";
+  ot->description = "General data-block management operations";
 
   /* callbacks */
   ot->invoke = WM_menu_invoke;
@@ -2489,16 +2810,12 @@ static int outliner_lib_operation_exec(bContext *C, wmOperator *op)
   Main *bmain = CTX_data_main(C);
   Scene *scene = CTX_data_scene(C);
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
-  int scenelevel = 0, objectlevel = 0, idlevel = 0, datalevel = 0;
 
   /* check for invalid states */
   if (space_outliner == nullptr) {
     return OPERATOR_CANCELLED;
   }
 
-  TreeElement *te = get_target_element(space_outliner);
-  get_element_operation_type(te, &scenelevel, &objectlevel, &idlevel, &datalevel);
-
   eOutlinerLibOpTypes event = (eOutlinerLibOpTypes)RNA_enum_get(op->ptr, "type");
   switch (event) {
     case OL_LIB_DELETE: {
@@ -2606,8 +2923,7 @@ static int outliner_action_set_exec(bContext *C, wmOperator *op)
   get_element_operation_type(te, &scenelevel, &objectlevel, &idlevel, &datalevel);
 
   /* get action to use */
-  act = reinterpret_cast<bAction *>(
-      BLI_findlink(&bmain->actions, RNA_enum_get(op->ptr, "action")));
+  act = static_cast<bAction *>(BLI_findlink(&bmain->actions, RNA_enum_get(op->ptr, "action")));
 
   if (act == nullptr) {
     BKE_report(op->reports, RPT_ERROR, "No valid action to add");
@@ -2878,6 +3194,24 @@ void OUTLINER_OT_modifier_operation(wmOperatorType *ot)
 /** \name Data Menu Operator
  * \{ */
 
+static bool outliner_data_operation_poll(bContext *C)
+{
+  if (!ED_operator_outliner_active(C)) {
+    return false;
+  }
+  const SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
+  const TreeElement *te = get_target_element(space_outliner);
+  int scenelevel = 0, objectlevel = 0, idlevel = 0, datalevel = 0;
+  get_element_operation_type(te, &scenelevel, &objectlevel, &idlevel, &datalevel);
+  return ELEM(datalevel,
+              TSE_POSE_CHANNEL,
+              TSE_BONE,
+              TSE_EBONE,
+              TSE_SEQUENCE,
+              TSE_GP_LAYER,
+              TSE_RNA_STRUCT);
+}
+
 static int outliner_data_operation_exec(bContext *C, wmOperator *op)
 {
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
@@ -2988,7 +3322,7 @@ void OUTLINER_OT_data_operation(wmOperatorType *ot)
   /* callbacks */
   ot->invoke = WM_menu_invoke;
   ot->exec = outliner_data_operation_exec;
-  ot->poll = outliner_operation_tree_element_poll;
+  ot->poll = outliner_data_operation_poll;
 
   ot->flag = 0;
 
@@ -3010,9 +3344,12 @@ static int outliner_operator_menu(bContext *C, const char *opname)
 
   /* set this so the default execution context is the same as submenus */
   uiLayoutSetOperatorContext(layout, WM_OP_INVOKE_REGION_WIN);
-  uiItemsEnumO(layout, ot->idname, RNA_property_identifier(ot->prop));
 
-  uiItemS(layout);
+  if (WM_operator_poll(C, ot)) {
+    uiItemsEnumO(layout, ot->idname, RNA_property_identifier(ot->prop));
+
+    uiItemS(layout);
+  }
 
   uiItemMContents(layout, "OUTLINER_MT_context_menu");
 
@@ -3022,7 +3359,6 @@ static int outliner_operator_menu(bContext *C, const char *opname)
 }
 
 static int do_outliner_operation_event(bContext *C,
-                                       ReportList *reports,
                                        ARegion *region,
                                        SpaceOutliner *space_outliner,
                                        TreeElement *te)
@@ -3045,10 +3381,6 @@ static int do_outliner_operation_event(bContext *C,
   get_element_operation_type(te, &scenelevel, &objectlevel, &idlevel, &datalevel);
 
   if (scenelevel) {
-    if (objectlevel || datalevel || idlevel) {
-      BKE_report(reports, RPT_WARNING, "Mixed selection");
-      return OPERATOR_CANCELLED;
-    }
     return outliner_operator_menu(C, "OUTLINER_OT_scene_operation");
   }
   if (objectlevel) {
@@ -3056,11 +3388,6 @@ static int do_outliner_operation_event(bContext *C,
     return OPERATOR_FINISHED;
   }
   if (idlevel) {
-    if (idlevel == -1 || datalevel) {
-      BKE_report(reports, RPT_WARNING, "Mixed selection");
-      return OPERATOR_CANCELLED;
-    }
-
     switch (idlevel) {
       case ID_GR:
         WM_menu_name_call(C, "OUTLINER_MT_collection", WM_OP_INVOKE_REGION_WIN);
@@ -3075,10 +3402,6 @@ static int do_outliner_operation_event(bContext *C,
     }
   }
   else if (datalevel) {
-    if (datalevel == -1) {
-      BKE_report(reports, RPT_WARNING, "Mixed selection");
-      return OPERATOR_CANCELLED;
-    }
     if (datalevel == TSE_ANIM_DATA) {
       return outliner_operator_menu(C, "OUTLINER_OT_animdata_operation");
     }
@@ -3110,7 +3433,7 @@ static int do_outliner_operation_event(bContext *C,
   return OPERATOR_CANCELLED;
 }
 
-static int outliner_operation(bContext *C, wmOperator *op, const wmEvent *event)
+static int outliner_operation(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
 {
   ARegion *region = CTX_wm_region(C);
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
@@ -3131,7 +3454,7 @@ static int outliner_operation(bContext *C, wmOperator *op, const wmEvent *event)
     return OPERATOR_PASS_THROUGH;
   }
 
-  return do_outliner_operation_event(C, op->reports, region, space_outliner, hovered_te);
+  return do_outliner_operation_event(C, region, space_outliner, hovered_te);
 }
 
 void OUTLINER_OT_operation(wmOperatorType *ot)
@@ -3146,3 +3469,5 @@ void OUTLINER_OT_operation(wmOperatorType *ot)
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_tree.cc b/source/blender/editors/space_outliner/outliner_tree.cc
index aa739758ecb..8a2ff8c2ece 100644
--- a/source/blender/editors/space_outliner/outliner_tree.cc
+++ b/source/blender/editors/space_outliner/outliner_tree.cc
@@ -41,6 +41,7 @@
 #include "BLI_fnmatch.h"
 #include "BLI_listbase.h"
 #include "BLI_mempool.h"
+#include "BLI_timeit.hh"
 #include "BLI_utildefines.h"
 
 #include "BLT_translation.h"
@@ -51,7 +52,7 @@
 #include "BKE_lib_id.h"
 #include "BKE_main.h"
 #include "BKE_modifier.h"
-#include "BKE_outliner_treehash.h"
+#include "BKE_outliner_treehash.hh"
 
 #include "ED_screen.h"
 
@@ -69,7 +70,7 @@
 #  include "BLI_math_base.h" /* M_PI */
 #endif
 
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 /* prototypes */
 static int outliner_exclude_filter_get(const SpaceOutliner *space_outliner);
@@ -90,7 +91,7 @@ static void outliner_storage_cleanup(SpaceOutliner *space_outliner)
     BLI_mempool_iter iter;
 
     BLI_mempool_iternew(ts, &iter);
-    while ((tselem = reinterpret_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
+    while ((tselem = static_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
       tselem->used = 0;
     }
 
@@ -100,7 +101,7 @@ static void outliner_storage_cleanup(SpaceOutliner *space_outliner)
       space_outliner->storeflag &= ~SO_TREESTORE_CLEANUP;
 
       BLI_mempool_iternew(ts, &iter);
-      while ((tselem = reinterpret_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
+      while ((tselem = static_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
         if (tselem->id == nullptr) {
           unused++;
         }
@@ -110,34 +111,30 @@ static void outliner_storage_cleanup(SpaceOutliner *space_outliner)
         if (BLI_mempool_len(ts) == unused) {
           BLI_mempool_destroy(ts);
           space_outliner->treestore = nullptr;
-          if (space_outliner->runtime->treehash) {
-            BKE_outliner_treehash_free(space_outliner->runtime->treehash);
-            space_outliner->runtime->treehash = nullptr;
-          }
+          space_outliner->runtime->tree_hash = nullptr;
         }
         else {
           TreeStoreElem *tsenew;
           BLI_mempool *new_ts = BLI_mempool_create(
               sizeof(TreeStoreElem), BLI_mempool_len(ts) - unused, 512, BLI_MEMPOOL_ALLOW_ITER);
           BLI_mempool_iternew(ts, &iter);
-          while ((tselem = reinterpret_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
+          while ((tselem = static_cast<TreeStoreElem *>(BLI_mempool_iterstep(&iter)))) {
             if (tselem->id) {
-              tsenew = reinterpret_cast<TreeStoreElem *>(BLI_mempool_alloc(new_ts));
+              tsenew = static_cast<TreeStoreElem *>(BLI_mempool_alloc(new_ts));
               *tsenew = *tselem;
             }
           }
           BLI_mempool_destroy(ts);
           space_outliner->treestore = new_ts;
-          if (space_outliner->runtime->treehash) {
+          if (space_outliner->runtime->tree_hash) {
             /* update hash table to fix broken pointers */
-            BKE_outliner_treehash_rebuild_from_treestore(space_outliner->runtime->treehash,
-                                                         space_outliner->treestore);
+            space_outliner->runtime->tree_hash->rebuild_from_treestore(*space_outliner->treestore);
           }
         }
       }
     }
-    else if (space_outliner->runtime->treehash) {
-      BKE_outliner_treehash_clear_used(space_outliner->runtime->treehash);
+    else if (space_outliner->runtime->tree_hash) {
+      space_outliner->runtime->tree_hash->clear_used();
     }
   }
 }
@@ -150,15 +147,14 @@ static void check_persistent(
     space_outliner->treestore = BLI_mempool_create(
         sizeof(TreeStoreElem), 1, 512, BLI_MEMPOOL_ALLOW_ITER);
   }
-  if (space_outliner->runtime->treehash == nullptr) {
-    space_outliner->runtime->treehash = reinterpret_cast<GHash *>(
-        BKE_outliner_treehash_create_from_treestore(space_outliner->treestore));
+  if (space_outliner->runtime->tree_hash == nullptr) {
+    space_outliner->runtime->tree_hash = treehash::TreeHash::create_from_treestore(
+        *space_outliner->treestore);
   }
 
   /* find any unused tree element in treestore and mark it as used
    * (note that there may be multiple unused elements in case of linked objects) */
-  TreeStoreElem *tselem = BKE_outliner_treehash_lookup_unused(
-      space_outliner->runtime->treehash, type, nr, id);
+  TreeStoreElem *tselem = space_outliner->runtime->tree_hash->lookup_unused(type, nr, id);
   if (tselem) {
     te->store_elem = tselem;
     tselem->used = 1;
@@ -166,14 +162,14 @@ static void check_persistent(
   }
 
   /* add 1 element to treestore */
-  tselem = reinterpret_cast<TreeStoreElem *>(BLI_mempool_alloc(space_outliner->treestore));
+  tselem = static_cast<TreeStoreElem *>(BLI_mempool_alloc(space_outliner->treestore));
   tselem->type = type;
   tselem->nr = type ? nr : 0;
   tselem->id = id;
   tselem->used = 0;
   tselem->flag = TSE_CLOSED;
   te->store_elem = tselem;
-  BKE_outliner_treehash_add_element(space_outliner->runtime->treehash, tselem);
+  space_outliner->runtime->tree_hash->add_element(*tselem);
 }
 
 /** \} */
@@ -221,11 +217,6 @@ bool outliner_requires_rebuild_on_select_or_active_change(const SpaceOutliner *s
   return exclude_flags & (SO_FILTER_OB_STATE_SELECTED | SO_FILTER_OB_STATE_ACTIVE);
 }
 
-bool outliner_requires_rebuild_on_open_change(const SpaceOutliner *space_outliner)
-{
-  return ELEM(space_outliner->outlinevis, SO_DATA_API);
-}
-
 /* special handling of hierarchical non-lib data */
 static void outliner_add_bone(SpaceOutliner *space_outliner,
                               ListBase *lb,
@@ -293,7 +284,7 @@ static void outliner_add_object_contents(SpaceOutliner *space_outliner,
   outliner_add_element(space_outliner, &te->subtree, ob->data, te, TSE_SOME_ID, 0);
 
   if (ob->pose) {
-    bArmature *arm = reinterpret_cast<bArmature *>(ob->data);
+    bArmature *arm = static_cast<bArmature *>(ob->data);
     TreeElement *tenla = outliner_add_element(
         space_outliner, &te->subtree, ob, te, TSE_POSE_BASE, 0);
     tenla->name = IFACE_("Pose");
@@ -339,7 +330,7 @@ static void outliner_add_object_contents(SpaceOutliner *space_outliner,
         }
       }
       /* make hierarchy */
-      TreeElement *ten = reinterpret_cast<TreeElement *>(tenla->subtree.first);
+      TreeElement *ten = static_cast<TreeElement *>(tenla->subtree.first);
       while (ten) {
         TreeElement *nten = ten->next, *par;
         tselem = TREESTORE(ten);
@@ -694,15 +685,15 @@ static void outliner_add_id_contents(SpaceOutliner *space_outliner,
           ebone->temp.p = ten;
         }
         /* make hierarchy */
-        TreeElement *ten = arm->edbo->first ? reinterpret_cast<TreeElement *>(
-                                                  ((EditBone *)arm->edbo->first)->temp.p) :
-                                              nullptr;
+        TreeElement *ten = arm->edbo->first ?
+                               static_cast<TreeElement *>(((EditBone *)arm->edbo->first)->temp.p) :
+                               nullptr;
         while (ten) {
           TreeElement *nten = ten->next, *par;
           EditBone *ebone = (EditBone *)ten->directdata;
           if (ebone->parent) {
             BLI_remlink(&te->subtree, ten);
-            par = reinterpret_cast<TreeElement *>(ebone->parent->temp.p);
+            par = static_cast<TreeElement *>(ebone->parent->temp.p);
             BLI_addtail(&par->subtree, ten);
             ten->parent = par;
           }
@@ -795,8 +786,6 @@ static void outliner_add_id_contents(SpaceOutliner *space_outliner,
   }
 }
 
-namespace blender::ed::outliner {
-
 TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
                                   ListBase *lb,
                                   void *idv,
@@ -805,21 +794,24 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
                                   short index,
                                   const bool expand)
 {
-  ID *id = reinterpret_cast<ID *>(idv);
+  ID *id = static_cast<ID *>(idv);
 
   if (ELEM(type, TSE_RNA_STRUCT, TSE_RNA_PROPERTY, TSE_RNA_ARRAY_ELEM)) {
     id = ((PointerRNA *)idv)->owner_id;
     if (!id) {
-      id = reinterpret_cast<ID *>(((PointerRNA *)idv)->data);
+      id = static_cast<ID *>(((PointerRNA *)idv)->data);
     }
   }
   else if (type == TSE_GP_LAYER) {
     /* idv is the layer itself */
     id = TREESTORE(parent)->id;
   }
+  else if (ELEM(type, TSE_GENERIC_LABEL)) {
+    id = nullptr;
+  }
 
   /* exceptions */
-  if (type == TSE_ID_BASE) {
+  if (ELEM(type, TSE_ID_BASE, TSE_GENERIC_LABEL)) {
     /* pass */
   }
   else if (id == nullptr) {
@@ -869,7 +861,7 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
   else if (ELEM(type, TSE_LAYER_COLLECTION, TSE_SCENE_COLLECTION_BASE, TSE_VIEW_COLLECTION_BASE)) {
     /* pass */
   }
-  else if (type == TSE_ID_BASE) {
+  else if (ELEM(type, TSE_ID_BASE, TSE_GENERIC_LABEL)) {
     /* pass */
   }
   else if (type == TSE_SOME_ID) {
@@ -877,7 +869,10 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
       BLI_assert_msg(0, "Expected this ID type to be ported to new Outliner tree-element design");
     }
   }
-  else if (ELEM(type, TSE_LIBRARY_OVERRIDE_BASE, TSE_LIBRARY_OVERRIDE)) {
+  else if (ELEM(type,
+                TSE_LIBRARY_OVERRIDE_BASE,
+                TSE_LIBRARY_OVERRIDE,
+                TSE_LIBRARY_OVERRIDE_OPERATION)) {
     if (!te->abstract_element) {
       BLI_assert_msg(0,
                      "Expected override types to be ported to new Outliner tree-element design");
@@ -895,10 +890,13 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
     te->idcode = GS(id->name);
   }
 
-  if (expand && te->abstract_element && te->abstract_element->isExpandValid()) {
+  if (!expand) {
+    /* Pass */
+  }
+  else if (te->abstract_element && te->abstract_element->isExpandValid()) {
     tree_element_expand(*te->abstract_element, *space_outliner);
   }
-  else if (expand && (type == TSE_SOME_ID)) {
+  else if (type == TSE_SOME_ID) {
     /* ID types not (fully) ported to new design yet. */
     if (te->abstract_element->expandPoll(*space_outliner)) {
       outliner_add_id_contents(space_outliner, te, tselem, id);
@@ -916,15 +914,14 @@ TreeElement *outliner_add_element(SpaceOutliner *space_outliner,
                 TSE_RNA_ARRAY_ELEM,
                 TSE_SEQUENCE,
                 TSE_SEQ_STRIP,
-                TSE_SEQUENCE_DUP)) {
+                TSE_SEQUENCE_DUP,
+                TSE_GENERIC_LABEL)) {
     BLI_assert_msg(false, "Element type should already use new AbstractTreeElement design");
   }
 
   return te;
 }
 
-}  // namespace blender::ed::outliner
-
 /* ======================================================= */
 
 BLI_INLINE void outliner_add_collection_init(TreeElement *te, Collection *collection)
@@ -980,8 +977,8 @@ struct tTreeSort {
 /* alphabetical comparator, trying to put objects first */
 static int treesort_alpha_ob(const void *v1, const void *v2)
 {
-  const tTreeSort *x1 = reinterpret_cast<const tTreeSort *>(v1);
-  const tTreeSort *x2 = reinterpret_cast<const tTreeSort *>(v2);
+  const tTreeSort *x1 = static_cast<const tTreeSort *>(v1);
+  const tTreeSort *x2 = static_cast<const tTreeSort *>(v2);
 
   /* first put objects last (hierarchy) */
   int comp = (x1->idcode == ID_OB);
@@ -1019,8 +1016,8 @@ static int treesort_alpha_ob(const void *v1, const void *v2)
 /* Move children that are not in the collection to the end of the list. */
 static int treesort_child_not_in_collection(const void *v1, const void *v2)
 {
-  const tTreeSort *x1 = reinterpret_cast<const tTreeSort *>(v1);
-  const tTreeSort *x2 = reinterpret_cast<const tTreeSort *>(v2);
+  const tTreeSort *x1 = static_cast<const tTreeSort *>(v1);
+  const tTreeSort *x2 = static_cast<const tTreeSort *>(v2);
 
   /* Among objects first come the ones in the collection, followed by the ones not on it.
    * This way we can have the dashed lines in a separate style connecting the former. */
@@ -1033,8 +1030,8 @@ static int treesort_child_not_in_collection(const void *v1, const void *v2)
 /* alphabetical comparator */
 static int treesort_alpha(const void *v1, const void *v2)
 {
-  const tTreeSort *x1 = reinterpret_cast<const tTreeSort *>(v1);
-  const tTreeSort *x2 = reinterpret_cast<const tTreeSort *>(v2);
+  const tTreeSort *x1 = static_cast<const tTreeSort *>(v1);
+  const tTreeSort *x2 = static_cast<const tTreeSort *>(v2);
 
   int comp = BLI_strcasecmp_natural(x1->name, x2->name);
 
@@ -1091,7 +1088,7 @@ static int treesort_obtype_alpha(const void *v1, const void *v2)
 /* sort happens on each subtree individual */
 static void outliner_sort(ListBase *lb)
 {
-  TreeElement *last_te = reinterpret_cast<TreeElement *>(lb->last);
+  TreeElement *last_te = static_cast<TreeElement *>(lb->last);
   if (last_te == nullptr) {
     return;
   }
@@ -1103,7 +1100,7 @@ static void outliner_sort(ListBase *lb)
     int totelem = BLI_listbase_count(lb);
 
     if (totelem > 1) {
-      tTreeSort *tear = reinterpret_cast<tTreeSort *>(
+      tTreeSort *tear = static_cast<tTreeSort *>(
           MEM_mallocN(totelem * sizeof(tTreeSort), "tree sort array"));
       tTreeSort *tp = tear;
       int skip = 0;
@@ -1159,7 +1156,7 @@ static void outliner_sort(ListBase *lb)
 
 static void outliner_collections_children_sort(ListBase *lb)
 {
-  TreeElement *last_te = reinterpret_cast<TreeElement *>(lb->last);
+  TreeElement *last_te = static_cast<TreeElement *>(lb->last);
   if (last_te == nullptr) {
     return;
   }
@@ -1170,7 +1167,7 @@ static void outliner_collections_children_sort(ListBase *lb)
     int totelem = BLI_listbase_count(lb);
 
     if (totelem > 1) {
-      tTreeSort *tear = reinterpret_cast<tTreeSort *>(
+      tTreeSort *tear = static_cast<tTreeSort *>(
           MEM_mallocN(totelem * sizeof(tTreeSort), "tree sort array"));
       tTreeSort *tp = tear;
 
@@ -1398,7 +1395,8 @@ static int outliner_exclude_filter_get(const SpaceOutliner *space_outliner)
   return exclude_filter;
 }
 
-static bool outliner_element_visible_get(ViewLayer *view_layer,
+static bool outliner_element_visible_get(const Scene *scene,
+                                         ViewLayer *view_layer,
                                          TreeElement *te,
                                          const int exclude_filter)
 {
@@ -1453,6 +1451,7 @@ static bool outliner_element_visible_get(ViewLayer *view_layer,
 
     if (exclude_filter & SO_FILTER_OB_STATE) {
       if (base == nullptr) {
+        BKE_view_layer_synced_ensure(scene, view_layer);
         base = BKE_view_layer_base_find(view_layer, ob);
 
         if (base == nullptr) {
@@ -1462,7 +1461,7 @@ static bool outliner_element_visible_get(ViewLayer *view_layer,
 
       bool is_visible = true;
       if (exclude_filter & SO_FILTER_OB_STATE_VISIBLE) {
-        if ((base->flag & BASE_VISIBLE_VIEWLAYER) == 0) {
+        if ((base->flag & BASE_ENABLED_AND_VISIBLE_IN_DEFAULT_VIEWPORT) == 0) {
           is_visible = false;
         }
       }
@@ -1478,7 +1477,8 @@ static bool outliner_element_visible_get(ViewLayer *view_layer,
       }
       else {
         BLI_assert(exclude_filter & SO_FILTER_OB_STATE_ACTIVE);
-        if (base != BASACT(view_layer)) {
+        BKE_view_layer_synced_ensure(scene, view_layer);
+        if (base != BKE_view_layer_active_base_get(view_layer)) {
           is_visible = false;
         }
       }
@@ -1541,8 +1541,7 @@ static TreeElement *outliner_extract_children_from_subtree(TreeElement *element,
 
   if (outliner_element_is_collection_or_object(element)) {
     TreeElement *te_prev = nullptr;
-    for (TreeElement *te = reinterpret_cast<TreeElement *>(element->subtree.last); te;
-         te = te_prev) {
+    for (TreeElement *te = static_cast<TreeElement *>(element->subtree.last); te; te = te_prev) {
       te_prev = te->prev;
 
       if (!outliner_element_is_collection_or_object(te)) {
@@ -1561,6 +1560,7 @@ static TreeElement *outliner_extract_children_from_subtree(TreeElement *element,
 }
 
 static int outliner_filter_subtree(SpaceOutliner *space_outliner,
+                                   const Scene *scene,
                                    ViewLayer *view_layer,
                                    ListBase *lb,
                                    const char *search_string,
@@ -1569,20 +1569,20 @@ static int outliner_filter_subtree(SpaceOutliner *space_outliner,
   TreeElement *te, *te_next;
   TreeStoreElem *tselem;
 
-  for (te = reinterpret_cast<TreeElement *>(lb->first); te; te = te_next) {
+  for (te = static_cast<TreeElement *>(lb->first); te; te = te_next) {
     te_next = te->next;
-    if ((outliner_element_visible_get(view_layer, te, exclude_filter) == false)) {
+    if ((outliner_element_visible_get(scene, view_layer, te, exclude_filter) == false)) {
       /* Don't free the tree, but extract the children from the parent and add to this tree. */
       /* This also needs filtering the subtree prior (see T69246). */
       outliner_filter_subtree(
-          space_outliner, view_layer, &te->subtree, search_string, exclude_filter);
+          space_outliner, scene, view_layer, &te->subtree, search_string, exclude_filter);
       te_next = outliner_extract_children_from_subtree(te, lb);
       continue;
     }
     if ((exclude_filter & SO_FILTER_SEARCH) == 0) {
       /* Filter subtree too. */
       outliner_filter_subtree(
-          space_outliner, view_layer, &te->subtree, search_string, exclude_filter);
+          space_outliner, scene, view_layer, &te->subtree, search_string, exclude_filter);
       continue;
     }
 
@@ -1600,7 +1600,8 @@ static int outliner_filter_subtree(SpaceOutliner *space_outliner,
 
       if ((!TSELEM_OPEN(tselem, space_outliner)) ||
           outliner_filter_subtree(
-              space_outliner, view_layer, &te->subtree, search_string, exclude_filter) == 0) {
+              space_outliner, scene, view_layer, &te->subtree, search_string, exclude_filter) ==
+              0) {
         outliner_free_tree_element(te, lb);
       }
     }
@@ -1612,7 +1613,7 @@ static int outliner_filter_subtree(SpaceOutliner *space_outliner,
 
       /* filter subtree too */
       outliner_filter_subtree(
-          space_outliner, view_layer, &te->subtree, search_string, exclude_filter);
+          space_outliner, scene, view_layer, &te->subtree, search_string, exclude_filter);
     }
   }
 
@@ -1620,7 +1621,9 @@ static int outliner_filter_subtree(SpaceOutliner *space_outliner,
   return (BLI_listbase_is_empty(lb) == false);
 }
 
-static void outliner_filter_tree(SpaceOutliner *space_outliner, ViewLayer *view_layer)
+static void outliner_filter_tree(SpaceOutliner *space_outliner,
+                                 const Scene *scene,
+                                 ViewLayer *view_layer)
 {
   char search_buff[sizeof(((struct SpaceOutliner *)nullptr)->search_string) + 2];
   char *search_string;
@@ -1641,7 +1644,7 @@ static void outliner_filter_tree(SpaceOutliner *space_outliner, ViewLayer *view_
   }
 
   outliner_filter_subtree(
-      space_outliner, view_layer, &space_outliner->tree, search_string, exclude_filter);
+      space_outliner, scene, view_layer, &space_outliner->tree, search_string, exclude_filter);
 }
 
 static void outliner_clear_newid_from_main(Main *bmain)
@@ -1675,10 +1678,9 @@ void outliner_build_tree(Main *mainvar,
     space_outliner->search_flags &= ~SO_SEARCH_RECURSIVE;
   }
 
-  if (space_outliner->runtime->treehash && (space_outliner->storeflag & SO_TREESTORE_REBUILD) &&
+  if (space_outliner->runtime->tree_hash && (space_outliner->storeflag & SO_TREESTORE_REBUILD) &&
       space_outliner->treestore) {
-    BKE_outliner_treehash_rebuild_from_treestore(space_outliner->runtime->treehash,
-                                                 space_outliner->treestore);
+    space_outliner->runtime->tree_hash->rebuild_from_treestore(*space_outliner->treestore);
   }
   space_outliner->storeflag &= ~SO_TREESTORE_REBUILD;
 
@@ -1689,6 +1691,10 @@ void outliner_build_tree(Main *mainvar,
     return;
   }
 
+  /* Enable for benchmarking. Starts a timer, results will be printed on function exit. */
+  // SCOPED_TIMER("Outliner Rebuild");
+  // SCOPED_TIMER_AVERAGED("Outliner Rebuild");
+
   OutlinerTreeElementFocus focus;
   outliner_store_scrolling_position(space_outliner, region, &focus);
 
@@ -1715,7 +1721,7 @@ void outliner_build_tree(Main *mainvar,
     outliner_collections_children_sort(&space_outliner->tree);
   }
 
-  outliner_filter_tree(space_outliner, view_layer);
+  outliner_filter_tree(space_outliner, scene, view_layer);
   outliner_restore_scrolling_position(space_outliner, region, &focus);
 
   /* `ID.newid` pointer is abused when building tree, DO NOT call #BKE_main_id_newptr_and_tag_clear
@@ -1724,3 +1730,5 @@ void outliner_build_tree(Main *mainvar,
 }
 
 /** \} */
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/outliner_utils.cc b/source/blender/editors/space_outliner/outliner_utils.cc
index 0db612ce6db..2deedccc29e 100644
--- a/source/blender/editors/space_outliner/outliner_utils.cc
+++ b/source/blender/editors/space_outliner/outliner_utils.cc
@@ -18,7 +18,7 @@
 #include "BKE_context.h"
 #include "BKE_layer.h"
 #include "BKE_object.h"
-#include "BKE_outliner_treehash.h"
+#include "BKE_outliner_treehash.hh"
 
 #include "ED_outliner.h"
 #include "ED_screen.h"
@@ -27,9 +27,10 @@
 #include "UI_view2d.h"
 
 #include "outliner_intern.hh"
+#include "tree/tree_display.hh"
 #include "tree/tree_iterator.hh"
 
-using namespace blender::ed::outliner;
+namespace blender::ed::outliner {
 
 /* -------------------------------------------------------------------- */
 /** \name Tree View Context
@@ -44,7 +45,8 @@ void outliner_viewcontext_init(const bContext *C, TreeViewContext *tvc)
   tvc->view_layer = CTX_data_view_layer(C);
 
   /* Objects. */
-  tvc->obact = OBACT(tvc->view_layer);
+  BKE_view_layer_synced_ensure(tvc->scene, tvc->view_layer);
+  tvc->obact = BKE_view_layer_active_object_get(tvc->view_layer);
   if (tvc->obact != nullptr) {
     tvc->ob_edit = OBEDIT_FROM_OBACT(tvc->obact);
 
@@ -98,7 +100,7 @@ static TreeElement *outliner_find_item_at_x_in_row_recursive(const TreeElement *
                                                              float view_co_x,
                                                              bool *r_is_merged_icon)
 {
-  TreeElement *child_te = reinterpret_cast<TreeElement *>(parent_te->subtree.first);
+  TreeElement *child_te = static_cast<TreeElement *>(parent_te->subtree.first);
 
   while (child_te) {
     const bool over_element = (view_co_x > child_te->xs) && (view_co_x < child_te->xend);
@@ -175,24 +177,6 @@ TreeElement *outliner_find_parent_element(ListBase *lb,
   return nullptr;
 }
 
-TreeElement *outliner_find_tse(SpaceOutliner *space_outliner, const TreeStoreElem *tse)
-{
-  TreeStoreElem *tselem;
-
-  if (tse->id == nullptr) {
-    return nullptr;
-  }
-
-  /* Check if 'tse' is in tree-store. */
-  tselem = BKE_outliner_treehash_lookup_any(
-      space_outliner->runtime->treehash, tse->type, tse->nr, tse->id);
-  if (tselem) {
-    return outliner_find_tree_element(&space_outliner->tree, tselem);
-  }
-
-  return nullptr;
-}
-
 TreeElement *outliner_find_id(SpaceOutliner *space_outliner, ListBase *lb, const ID *id)
 {
   LISTBASE_FOREACH (TreeElement *, te, lb) {
@@ -282,8 +266,7 @@ bool outliner_tree_traverse(const SpaceOutliner *space_outliner,
                             TreeTraversalFunc func,
                             void *customdata)
 {
-  for (TreeElement *te = reinterpret_cast<TreeElement *>(tree->first), *te_next; te;
-       te = te_next) {
+  for (TreeElement *te = static_cast<TreeElement *>(tree->first), *te_next; te; te = te_next) {
     TreeTraversalAction func_retval = TRAVERSE_CONTINUE;
     /* in case te is freed in callback */
     TreeStoreElem *tselem = TREESTORE(te);
@@ -455,7 +438,7 @@ void outliner_tag_redraw_avoid_rebuild_on_open_change(const SpaceOutliner *space
                                                       ARegion *region)
 {
   /* Avoid rebuild if possible. */
-  if (outliner_requires_rebuild_on_open_change(space_outliner)) {
+  if (space_outliner->runtime->tree_display->is_lazy_built()) {
     ED_region_tag_redraw(region);
   }
   else {
@@ -463,9 +446,14 @@ void outliner_tag_redraw_avoid_rebuild_on_open_change(const SpaceOutliner *space
   }
 }
 
+}  // namespace blender::ed::outliner
+
+using namespace blender::ed::outliner;
+
 Base *ED_outliner_give_base_under_cursor(bContext *C, const int mval[2])
 {
   ARegion *region = CTX_wm_region(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   SpaceOutliner *space_outliner = CTX_wm_space_outliner(C);
   TreeElement *te;
@@ -479,6 +467,7 @@ Base *ED_outliner_give_base_under_cursor(bContext *C, const int mval[2])
     TreeStoreElem *tselem = TREESTORE(te);
     if ((tselem->type == TSE_SOME_ID) && (te->idcode == ID_OB)) {
       Object *ob = (Object *)tselem->id;
+      BKE_view_layer_synced_ensure(scene, view_layer);
       base = (te->directdata) ? (Base *)te->directdata : BKE_view_layer_base_find(view_layer, ob);
     }
   }
diff --git a/source/blender/editors/space_outliner/space_outliner.cc b/source/blender/editors/space_outliner/space_outliner.cc
index 5bcd1edebc0..365bcae3f5d 100644
--- a/source/blender/editors/space_outliner/space_outliner.cc
+++ b/source/blender/editors/space_outliner/space_outliner.cc
@@ -16,7 +16,7 @@
 
 #include "BKE_context.h"
 #include "BKE_lib_remap.h"
-#include "BKE_outliner_treehash.h"
+#include "BKE_outliner_treehash.hh"
 #include "BKE_screen.h"
 
 #include "ED_screen.h"
@@ -37,16 +37,11 @@
 #include "outliner_intern.hh"
 #include "tree/tree_display.hh"
 
-SpaceOutliner_Runtime::SpaceOutliner_Runtime(const SpaceOutliner_Runtime & /*other*/)
-    : tree_display(nullptr), treehash(nullptr)
-{
-}
+namespace blender::ed::outliner {
 
-SpaceOutliner_Runtime::~SpaceOutliner_Runtime()
+SpaceOutliner_Runtime::SpaceOutliner_Runtime(const SpaceOutliner_Runtime & /*other*/)
+    : tree_display(nullptr), tree_hash(nullptr)
 {
-  if (treehash) {
-    BKE_outliner_treehash_free(treehash);
-  }
 }
 
 static void outliner_main_region_init(wmWindowManager *wm, ARegion *region)
@@ -100,8 +95,8 @@ static void outliner_main_region_listener(const wmRegionListenerParams *params)
 {
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
-  SpaceOutliner *space_outliner = reinterpret_cast<SpaceOutliner *>(area->spacedata.first);
+  const wmNotifier *wmn = params->notifier;
+  SpaceOutliner *space_outliner = static_cast<SpaceOutliner *>(area->spacedata.first);
 
   /* context changes */
   switch (wmn->category) {
@@ -191,7 +186,7 @@ static void outliner_main_region_listener(const wmRegionListenerParams *params)
       }
       break;
     case NC_ID:
-      if (ELEM(wmn->action, NA_RENAME, NA_ADDED)) {
+      if (ELEM(wmn->action, NA_RENAME, NA_ADDED, NA_REMOVED)) {
         ED_region_tag_redraw(region);
       }
       break;
@@ -264,7 +259,7 @@ static void outliner_main_region_message_subscribe(const wmRegionMessageSubscrib
   struct wmMsgBus *mbus = params->message_bus;
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  SpaceOutliner *space_outliner = reinterpret_cast<SpaceOutliner *>(area->spacedata.first);
+  SpaceOutliner *space_outliner = static_cast<SpaceOutliner *>(area->spacedata.first);
 
   wmMsgSubscribeValue msg_sub_value_region_tag_redraw{};
   msg_sub_value_region_tag_redraw.owner = region;
@@ -296,7 +291,7 @@ static void outliner_header_region_free(ARegion *UNUSED(region))
 static void outliner_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -361,7 +356,7 @@ static void outliner_free(SpaceLink *sl)
 /* spacetype; init callback */
 static void outliner_init(wmWindowManager *UNUSED(wm), ScrArea *area)
 {
-  SpaceOutliner *space_outliner = reinterpret_cast<SpaceOutliner *>(area->spacedata.first);
+  SpaceOutliner *space_outliner = static_cast<SpaceOutliner *>(area->spacedata.first);
 
   if (space_outliner->runtime == nullptr) {
     space_outliner->runtime = MEM_new<SpaceOutliner_Runtime>("SpaceOutliner_Runtime");
@@ -391,8 +386,6 @@ static void outliner_id_remap(ScrArea *area, SpaceLink *slink, const struct IDRe
 {
   SpaceOutliner *space_outliner = (SpaceOutliner *)slink;
 
-  BKE_id_remapper_apply(mappings, (ID **)&space_outliner->search_tse.id, ID_REMAP_APPLY_DEFAULT);
-
   if (!space_outliner->treestore) {
     return;
   }
@@ -420,7 +413,7 @@ static void outliner_id_remap(ScrArea *area, SpaceLink *slink, const struct IDRe
 
   /* Note that the Outliner may not be the active editor of the area, and hence not initialized.
    * So runtime data might not have been created yet. */
-  if (space_outliner->runtime && space_outliner->runtime->treehash && changed) {
+  if (space_outliner->runtime && space_outliner->runtime->tree_hash && changed) {
     /* rebuild hash table, because it depends on ids too */
     /* postpone a full rebuild because this can be called many times on-free */
     space_outliner->storeflag |= SO_TREESTORE_REBUILD;
@@ -437,18 +430,22 @@ static void outliner_id_remap(ScrArea *area, SpaceLink *slink, const struct IDRe
 static void outliner_deactivate(struct ScrArea *area)
 {
   /* Remove hover highlights */
-  SpaceOutliner *space_outliner = reinterpret_cast<SpaceOutliner *>(area->spacedata.first);
+  SpaceOutliner *space_outliner = static_cast<SpaceOutliner *>(area->spacedata.first);
   outliner_flag_set(*space_outliner, TSE_HIGHLIGHTED_ANY, false);
   ED_region_tag_redraw_no_rebuild(BKE_area_find_region_type(area, RGN_TYPE_WINDOW));
 }
 
+}  // namespace blender::ed::outliner
+
 void ED_spacetype_outliner(void)
 {
+  using namespace blender::ed::outliner;
+
   SpaceType *st = MEM_cnew<SpaceType>("spacetype time");
   ARegionType *art;
 
   st->spaceid = SPACE_OUTLINER;
-  strncpy(st->name, "Outliner", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Outliner");
 
   st->create = outliner_create;
   st->free = outliner_free;
diff --git a/source/blender/editors/space_outliner/tree/common.cc b/source/blender/editors/space_outliner/tree/common.cc
index 349d36e2fe6..199c80f021a 100644
--- a/source/blender/editors/space_outliner/tree/common.cc
+++ b/source/blender/editors/space_outliner/tree/common.cc
@@ -21,6 +21,8 @@
 #include "common.hh"
 #include "tree_display.hh"
 
+namespace blender::ed::outliner {
+
 /* -------------------------------------------------------------------- */
 /** \name ID Helpers.
  * \{ */
@@ -38,7 +40,7 @@ void outliner_make_object_parent_hierarchy(ListBase *lb)
 {
   /* build hierarchy */
   /* XXX also, set extents here... */
-  TreeElement *te = reinterpret_cast<TreeElement *>(lb->first);
+  TreeElement *te = static_cast<TreeElement *>(lb->first);
   while (te) {
     TreeElement *ten = te->next;
     TreeStoreElem *tselem = TREESTORE(te);
@@ -63,3 +65,5 @@ bool outliner_animdata_test(const AnimData *adt)
   }
   return false;
 }
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/common.hh b/source/blender/editors/space_outliner/tree/common.hh
index 96c1eb34354..ba2d1c3fab6 100644
--- a/source/blender/editors/space_outliner/tree/common.hh
+++ b/source/blender/editors/space_outliner/tree/common.hh
@@ -8,7 +8,11 @@
 
 struct ListBase;
 
+namespace blender::ed::outliner {
+
 const char *outliner_idcode_to_plural(short idcode);
 
 void outliner_make_object_parent_hierarchy(ListBase *lb);
 bool outliner_animdata_test(const struct AnimData *adt);
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_display.cc b/source/blender/editors/space_outliner/tree/tree_display.cc
index 6ab497b3fbb..fe4937829d6 100644
--- a/source/blender/editors/space_outliner/tree/tree_display.cc
+++ b/source/blender/editors/space_outliner/tree/tree_display.cc
@@ -50,4 +50,9 @@ bool AbstractTreeDisplay::supportsModeColumn() const
   return false;
 }
 
+bool AbstractTreeDisplay::is_lazy_built() const
+{
+  return false;
+}
+
 }  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_display.hh b/source/blender/editors/space_outliner/tree/tree_display.hh
index f8e35655c26..13b46651562 100644
--- a/source/blender/editors/space_outliner/tree/tree_display.hh
+++ b/source/blender/editors/space_outliner/tree/tree_display.hh
@@ -30,11 +30,11 @@ struct Main;
 struct Scene;
 struct Sequence;
 struct SpaceOutliner;
-struct TreeElement;
 struct ViewLayer;
 
 namespace blender::ed::outliner {
 
+struct TreeElement;
 class TreeElementID;
 
 /**
@@ -84,6 +84,15 @@ class AbstractTreeDisplay {
    */
   virtual bool supportsModeColumn() const;
 
+  /**
+   * Some trees may want to skip building children of collapsed parents. This should be done if the
+   * tree type may become very complex, which could cause noticeable slowdowns.
+   * Problem: This doesn't address performance issues while searching, since all elements are
+   * constructed for that. Trees of this type have to be rebuilt for any change to the collapsed
+   * state of any element.
+   */
+  virtual bool is_lazy_built() const;
+
  protected:
   /** All derived classes will need a handle to this, so storing it in the base for convenience. */
   SpaceOutliner &space_outliner_;
@@ -96,6 +105,7 @@ class AbstractTreeDisplay {
  * \brief Tree-Display for the View Layer display mode.
  */
 class TreeDisplayViewLayer final : public AbstractTreeDisplay {
+  Scene *scene_ = nullptr;
   ViewLayer *view_layer_ = nullptr;
   bool show_objects_ = true;
 
@@ -157,6 +167,8 @@ class TreeDisplayOverrideLibraryHierarchies final : public AbstractTreeDisplay {
 
   ListBase buildTree(const TreeSourceData &source_data) override;
 
+  bool is_lazy_built() const override;
+
  private:
   ListBase build_hierarchy_for_lib_or_main(Main *bmain,
                                            TreeElement &parent_te,
@@ -232,6 +244,8 @@ class TreeDisplayDataAPI final : public AbstractTreeDisplay {
   TreeDisplayDataAPI(SpaceOutliner &space_outliner);
 
   ListBase buildTree(const TreeSourceData &source_data) override;
+
+  bool is_lazy_built() const override;
 };
 
 }  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_display_data.cc b/source/blender/editors/space_outliner/tree/tree_display_data.cc
index bfeb8ce2bdc..3d9b927fbf1 100644
--- a/source/blender/editors/space_outliner/tree/tree_display_data.cc
+++ b/source/blender/editors/space_outliner/tree/tree_display_data.cc
@@ -42,4 +42,9 @@ ListBase TreeDisplayDataAPI::buildTree(const TreeSourceData &source_data)
   return tree;
 }
 
+bool TreeDisplayDataAPI::is_lazy_built() const
+{
+  return true;
+}
+
 }  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_display_override_library_hierarchies.cc b/source/blender/editors/space_outliner/tree/tree_display_override_library_hierarchies.cc
index f8705c3f0ad..2150d2b211a 100644
--- a/source/blender/editors/space_outliner/tree/tree_display_override_library_hierarchies.cc
+++ b/source/blender/editors/space_outliner/tree/tree_display_override_library_hierarchies.cc
@@ -15,6 +15,7 @@
 
 #include "BLT_translation.h"
 
+#include "BKE_lib_override.h"
 #include "BKE_lib_query.h"
 #include "BKE_main.h"
 
@@ -74,12 +75,18 @@ ListBase TreeDisplayOverrideLibraryHierarchies::buildTree(const TreeSourceData &
   return tree;
 }
 
+bool TreeDisplayOverrideLibraryHierarchies::is_lazy_built() const
+{
+  return true;
+}
+
 /* -------------------------------------------------------------------- */
 /** \name Library override hierarchy building
  * \{ */
 
 class OverrideIDHierarchyBuilder {
   SpaceOutliner &space_outliner_;
+  Main &bmain_;
   MainIDRelations &id_relations_;
 
   struct HierarchyBuildData {
@@ -93,8 +100,10 @@ class OverrideIDHierarchyBuilder {
   };
 
  public:
-  OverrideIDHierarchyBuilder(SpaceOutliner &space_outliner, MainIDRelations &id_relations)
-      : space_outliner_(space_outliner), id_relations_(id_relations)
+  OverrideIDHierarchyBuilder(SpaceOutliner &space_outliner,
+                             Main &bmain,
+                             MainIDRelations &id_relations)
+      : space_outliner_(space_outliner), bmain_(bmain), id_relations_(id_relations)
   {
   }
 
@@ -115,7 +124,7 @@ ListBase TreeDisplayOverrideLibraryHierarchies::build_hierarchy_for_lib_or_main(
    * returning. */
   BKE_main_relations_create(bmain, 0);
 
-  OverrideIDHierarchyBuilder builder(space_outliner_, *bmain->relations);
+  OverrideIDHierarchyBuilder builder(space_outliner_, *bmain, *bmain->relations);
 
   /* Keep track over which ID base elements were already added, and expand them once added. */
   Map<ID_Type, TreeElement *> id_base_te_map;
@@ -161,11 +170,16 @@ void OverrideIDHierarchyBuilder::build_hierarchy_for_ID(ID &override_root_id,
   build_hierarchy_for_ID_recursive(override_root_id, build_data, te_to_expand);
 }
 
+enum ForeachChildReturn {
+  FOREACH_CONTINUE,
+  FOREACH_BREAK,
+};
 /* Helpers (defined below). */
 static void foreach_natural_hierarchy_child(const MainIDRelations &id_relations,
                                             const ID &parent_id,
-                                            FunctionRef<void(ID &)> fn);
-static bool id_is_in_override_hierarchy(const ID &id,
+                                            FunctionRef<ForeachChildReturn(ID &)> fn);
+static bool id_is_in_override_hierarchy(const Main &bmain,
+                                        const ID &id,
                                         const ID &relationship_parent_id,
                                         const ID &override_root_id);
 
@@ -177,20 +191,32 @@ void OverrideIDHierarchyBuilder::build_hierarchy_for_ID_recursive(const ID &pare
   build_data.parent_ids.add(&parent_id);
 
   foreach_natural_hierarchy_child(id_relations_, parent_id, [&](ID &id) {
-    if (!id_is_in_override_hierarchy(id, parent_id, build_data.override_root_id_)) {
-      return;
+    /* Some IDs can use themselves, early abort. */
+    if (&id == &parent_id) {
+      return FOREACH_CONTINUE;
+    }
+    if (!id_is_in_override_hierarchy(bmain_, id, parent_id, build_data.override_root_id_)) {
+      return FOREACH_CONTINUE;
     }
 
     /* Avoid endless recursion: If there is an ancestor for this ID already, it recurses into
      * itself. */
     if (build_data.parent_ids.lookup_key_default(&id, nullptr)) {
-      return;
+      return FOREACH_CONTINUE;
     }
 
     /* Avoid duplicates: If there is a sibling for this ID already, the same ID is just used
      * multiple times by the same parent. */
     if (build_data.sibling_ids.lookup_key_default(&id, nullptr)) {
-      return;
+      return FOREACH_CONTINUE;
+    }
+
+    /* We only want to add children whose parent isn't collapsed. Otherwise, in complex scenes with
+     * thousands of relationships, the building can slow down tremendously. Tag the parent to allow
+     * un-collapsing, but don't actually add the children. */
+    if (!TSELEM_OPEN(TREESTORE(&te_to_expand), &space_outliner_)) {
+      te_to_expand.flag |= TE_PRETEND_HAS_CHILDREN;
+      return FOREACH_BREAK;
     }
 
     TreeElement *new_te = outliner_add_element(
@@ -204,6 +230,8 @@ void OverrideIDHierarchyBuilder::build_hierarchy_for_ID_recursive(const ID &pare
     child_build_data.parent_ids.add(&id);
     child_build_data.sibling_ids.reserve(10);
     build_hierarchy_for_ID_recursive(id, child_build_data, *new_te);
+
+    return FOREACH_CONTINUE;
   });
 }
 
@@ -229,7 +257,7 @@ void OverrideIDHierarchyBuilder::build_hierarchy_for_ID_recursive(const ID &pare
  */
 static void foreach_natural_hierarchy_child(const MainIDRelations &id_relations,
                                             const ID &parent_id,
-                                            FunctionRef<void(ID &)> fn)
+                                            FunctionRef<ForeachChildReturn(ID &)> fn)
 {
   const MainIDRelationsEntry *relations_of_id = static_cast<MainIDRelationsEntry *>(
       BLI_ghash_lookup(id_relations.relations_from_pointers, &parent_id));
@@ -250,12 +278,16 @@ static void foreach_natural_hierarchy_child(const MainIDRelations &id_relations,
     if (GS(target_id.name) == ID_OB) {
       const Object &potential_child_ob = reinterpret_cast<const Object &>(target_id);
       if (potential_child_ob.parent) {
-        fn(potential_child_ob.parent->id);
+        if (fn(potential_child_ob.parent->id) == FOREACH_BREAK) {
+          return;
+        }
         continue;
       }
     }
 
-    fn(target_id);
+    if (fn(target_id) == FOREACH_BREAK) {
+      return;
+    }
   }
 
   /* If the ID is an object, find and iterate over any child objects. */
@@ -268,15 +300,20 @@ static void foreach_natural_hierarchy_child(const MainIDRelations &id_relations,
         continue;
       }
 
-      Object &potential_child_ob = reinterpret_cast<Object &>(potential_child_id);
-      if (potential_child_ob.parent && &potential_child_ob.parent->id == &parent_id) {
-        fn(potential_child_id);
+      const Object &potential_child_ob = reinterpret_cast<Object &>(potential_child_id);
+      if (!potential_child_ob.parent || &potential_child_ob.parent->id != &parent_id) {
+        continue;
+      }
+
+      if (fn(potential_child_id) == FOREACH_BREAK) {
+        return;
       }
     }
   }
 }
 
-static bool id_is_in_override_hierarchy(const ID &id,
+static bool id_is_in_override_hierarchy(const Main &bmain,
+                                        const ID &id,
                                         const ID &relationship_parent_id,
                                         const ID &override_root_id)
 {
@@ -286,20 +323,12 @@ static bool id_is_in_override_hierarchy(const ID &id,
   const ID *real_override_id = &id;
 
   if (ID_IS_OVERRIDE_LIBRARY_VIRTUAL(&id)) {
-    /* This assumes that the parent ID is always the owner of the 'embedded' one, I.e. that no
-     * other ID directly uses the embedded one. Should be true, but the debug code adds some checks
-     * to validate this assumption. */
-    real_override_id = &relationship_parent_id;
-
-#ifndef NDEBUG
-    if (GS(id.name) == ID_KE) {
-      const Key *key = (Key *)&id;
-      BLI_assert(real_override_id == key->from);
-    }
-    else {
-      BLI_assert((id.flag & LIB_EMBEDDED_DATA) != 0);
-    }
-#endif
+    /* In many cases, `relationship_parent_id` is the owner, but not always (e.g. there can be
+     * drivers directly between an object and a shape-key). */
+    BKE_lib_override_library_get(const_cast<Main *>(&bmain),
+                                 const_cast<ID *>(&id),
+                                 const_cast<ID *>(&relationship_parent_id),
+                                 const_cast<ID **>(&real_override_id));
   }
 
   if (!ID_IS_OVERRIDE_LIBRARY(real_override_id)) {
diff --git a/source/blender/editors/space_outliner/tree/tree_display_view_layer.cc b/source/blender/editors/space_outliner/tree/tree_display_view_layer.cc
index c8869d90eca..66c1fa34914 100644
--- a/source/blender/editors/space_outliner/tree/tree_display_view_layer.cc
+++ b/source/blender/editors/space_outliner/tree/tree_display_view_layer.cc
@@ -64,6 +64,7 @@ ListBase TreeDisplayViewLayer::buildTree(const TreeSourceData &source_data)
 {
   ListBase tree = {nullptr};
   Scene *scene = source_data.scene;
+  scene_ = scene;
   show_objects_ = !(space_outliner_.filter & SO_FILTER_NO_OBJECT);
 
   for (auto *view_layer : ListBaseWrapper<ViewLayer>(scene->view_layers)) {
@@ -96,7 +97,8 @@ void TreeDisplayViewLayer::add_view_layer(Scene &scene, ListBase &tree, TreeElem
 
   if (space_outliner_.filter & SO_FILTER_NO_COLLECTION) {
     /* Show objects in the view layer. */
-    for (Base *base : List<Base>(view_layer_->object_bases)) {
+    BKE_view_layer_synced_ensure(&scene, view_layer_);
+    for (Base *base : List<Base>(*BKE_view_layer_object_bases_get(view_layer_))) {
       TreeElement *te_object = outliner_add_element(
           &space_outliner_, &tree, base->object, parent, TSE_SOME_ID, 0);
       te_object->directdata = base;
@@ -166,6 +168,7 @@ void TreeDisplayViewLayer::add_layer_collection_objects(ListBase &tree,
                                                         LayerCollection &lc,
                                                         TreeElement &ten)
 {
+  BKE_view_layer_synced_ensure(scene_, view_layer_);
   for (CollectionObject *cob : List<CollectionObject>(lc.collection->gobject)) {
     Base *base = BKE_view_layer_base_find(view_layer_, cob->ob);
     TreeElement *te_object = outliner_add_element(
diff --git a/source/blender/editors/space_outliner/tree/tree_element.cc b/source/blender/editors/space_outliner/tree/tree_element.cc
index 94d55b70e3c..4a540c3ce87 100644
--- a/source/blender/editors/space_outliner/tree/tree_element.cc
+++ b/source/blender/editors/space_outliner/tree/tree_element.cc
@@ -4,6 +4,9 @@
  * \ingroup spoutliner
  */
 
+#include <string>
+#include <string_view>
+
 #include "DNA_anim_types.h"
 #include "DNA_listBase.h"
 #include "DNA_space_types.h"
@@ -17,6 +20,7 @@
 #include "tree_element_driver.hh"
 #include "tree_element_gpencil_layer.hh"
 #include "tree_element_id.hh"
+#include "tree_element_label.hh"
 #include "tree_element_nla.hh"
 #include "tree_element_overrides.hh"
 #include "tree_element_rna.hh"
@@ -52,9 +56,11 @@ std::unique_ptr<AbstractTreeElement> AbstractTreeElement::createFromType(const i
   switch (type) {
     case TSE_SOME_ID:
       return TreeElementID::createFromID(legacy_te, *static_cast<ID *>(idv));
+    case TSE_GENERIC_LABEL:
+      return std::make_unique<TreeElementLabel>(legacy_te, static_cast<const char *>(idv));
     case TSE_ANIM_DATA:
       return std::make_unique<TreeElementAnimData>(legacy_te,
-                                                   *reinterpret_cast<IdAdtTemplate *>(idv)->adt);
+                                                   *static_cast<IdAdtTemplate *>(idv)->adt);
     case TSE_DRIVER_BASE:
       return std::make_unique<TreeElementDriverBase>(legacy_te, *static_cast<AnimData *>(idv));
     case TSE_NLA:
@@ -76,23 +82,24 @@ std::unique_ptr<AbstractTreeElement> AbstractTreeElement::createFromType(const i
     case TSE_LIBRARY_OVERRIDE:
       return std::make_unique<TreeElementOverridesProperty>(
           legacy_te, *static_cast<TreeElementOverridesData *>(idv));
+    case TSE_LIBRARY_OVERRIDE_OPERATION:
+      return std::make_unique<TreeElementOverridesPropertyOperation>(
+          legacy_te, *static_cast<TreeElementOverridesData *>(idv));
     case TSE_RNA_STRUCT:
-      return std::make_unique<TreeElementRNAStruct>(legacy_te,
-                                                    *reinterpret_cast<PointerRNA *>(idv));
+      return std::make_unique<TreeElementRNAStruct>(legacy_te, *static_cast<PointerRNA *>(idv));
     case TSE_RNA_PROPERTY:
       return std::make_unique<TreeElementRNAProperty>(
-          legacy_te, *reinterpret_cast<PointerRNA *>(idv), legacy_te.index);
+          legacy_te, *static_cast<PointerRNA *>(idv), legacy_te.index);
     case TSE_RNA_ARRAY_ELEM:
       return std::make_unique<TreeElementRNAArrayElement>(
-          legacy_te, *reinterpret_cast<PointerRNA *>(idv), legacy_te.index);
+          legacy_te, *static_cast<PointerRNA *>(idv), legacy_te.index);
     case TSE_SEQUENCE:
-      return std::make_unique<TreeElementSequence>(legacy_te, *reinterpret_cast<Sequence *>(idv));
+      return std::make_unique<TreeElementSequence>(legacy_te, *static_cast<Sequence *>(idv));
     case TSE_SEQ_STRIP:
-      return std::make_unique<TreeElementSequenceStrip>(legacy_te,
-                                                        *reinterpret_cast<Strip *>(idv));
+      return std::make_unique<TreeElementSequenceStrip>(legacy_te, *static_cast<Strip *>(idv));
     case TSE_SEQUENCE_DUP:
-      return std::make_unique<TreeElementSequenceStripDuplicate>(
-          legacy_te, *reinterpret_cast<Sequence *>(idv));
+      return std::make_unique<TreeElementSequenceStripDuplicate>(legacy_te,
+                                                                 *static_cast<Sequence *>(idv));
     default:
       break;
   }
@@ -105,6 +112,22 @@ StringRefNull AbstractTreeElement::getWarning() const
   return "";
 }
 
+std::optional<BIFIconID> AbstractTreeElement::getIcon() const
+{
+  return {};
+}
+
+void AbstractTreeElement::print_path()
+{
+  std::string path = legacy_te_.name;
+
+  for (TreeElement *parent = legacy_te_.parent; parent; parent = parent->parent) {
+    path = parent->name + std::string_view("/") + path;
+  }
+
+  std::cout << path << std::endl;
+}
+
 void AbstractTreeElement::uncollapse_by_default(TreeElement *legacy_te)
 {
   if (!TREESTORE(legacy_te)->used) {
diff --git a/source/blender/editors/space_outliner/tree/tree_element.hh b/source/blender/editors/space_outliner/tree/tree_element.hh
index 1098068d628..1b145a48daa 100644
--- a/source/blender/editors/space_outliner/tree/tree_element.hh
+++ b/source/blender/editors/space_outliner/tree/tree_element.hh
@@ -7,15 +7,18 @@
 #pragma once
 
 #include <memory>
+#include <optional>
 
 #include "BLI_string_ref.hh"
+#include "UI_resources.h"
 
 struct ListBase;
 struct SpaceOutliner;
-struct TreeElement;
 
 namespace blender::ed::outliner {
 
+struct TreeElement;
+
 /* -------------------------------------------------------------------- */
 /* Tree-Display Interface */
 
@@ -64,6 +67,25 @@ class AbstractTreeElement {
   virtual StringRefNull getWarning() const;
 
   /**
+   * Define the icon to be displayed for this element. If this returns an icon, this will be
+   * displayed. Otherwise, #tree_element_get_icon() may still determine an icon. By default no
+   * value is returned (#std::nullopt).
+   *
+   * All elements should be ported to use this over #tree_element_get_icon().
+   */
+  virtual std::optional<BIFIconID> getIcon() const;
+
+  /**
+   * Debugging helper: Print effective path of this tree element, constructed out of the
+   * #TreeElement.name of each element. E.g.:
+   * - Lorem
+   *   - ipsum dolor sit
+   *     - amet
+   * will print: Lorem/ipsum dolor sit/amet.
+   */
+  void print_path();
+
+  /**
    * Expand this tree element if it is displayed for the first time (as identified by its
    * tree-store element).
    *
diff --git a/source/blender/editors/space_outliner/tree/tree_element_anim_data.hh b/source/blender/editors/space_outliner/tree/tree_element_anim_data.hh
index 956cf3dec48..f3372329dd1 100644
--- a/source/blender/editors/space_outliner/tree/tree_element_anim_data.hh
+++ b/source/blender/editors/space_outliner/tree/tree_element_anim_data.hh
@@ -8,8 +8,6 @@
 
 #include "tree_element.hh"
 
-struct TreeElement;
-
 namespace blender::ed::outliner {
 
 class TreeElementAnimData final : public AbstractTreeElement {
diff --git a/source/blender/editors/space_outliner/tree/tree_element_driver.hh b/source/blender/editors/space_outliner/tree/tree_element_driver.hh
index 053217e18ec..f0213dd39f2 100644
--- a/source/blender/editors/space_outliner/tree/tree_element_driver.hh
+++ b/source/blender/editors/space_outliner/tree/tree_element_driver.hh
@@ -8,8 +8,6 @@
 
 #include "tree_element.hh"
 
-struct TreeElement;
-
 namespace blender::ed::outliner {
 
 class TreeElementDriverBase final : public AbstractTreeElement {
diff --git a/source/blender/editors/space_outliner/tree/tree_element_label.cc b/source/blender/editors/space_outliner/tree/tree_element_label.cc
new file mode 100644
index 00000000000..32fa62c5f5e
--- /dev/null
+++ b/source/blender/editors/space_outliner/tree/tree_element_label.cc
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup spoutliner
+ */
+
+#include "DNA_listBase.h"
+
+#include "DNA_outliner_types.h"
+
+#include "../outliner_intern.hh"
+
+#include "tree_element_label.hh"
+
+namespace blender::ed::outliner {
+
+TreeElementLabel::TreeElementLabel(TreeElement &legacy_te, const char *label)
+    : AbstractTreeElement(legacy_te), label_(label)
+{
+  BLI_assert(legacy_te_.store_elem->type == TSE_GENERIC_LABEL);
+  /* The draw string is actually accessed via #TreeElement.name, so make sure this always points to
+   * our string. */
+  legacy_te_.name = label_.c_str();
+}
+
+void TreeElementLabel::setIcon(const BIFIconID icon)
+{
+  icon_ = icon;
+}
+
+std::optional<BIFIconID> TreeElementLabel::getIcon() const
+{
+  return icon_;
+}
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_element_label.hh b/source/blender/editors/space_outliner/tree/tree_element_label.hh
new file mode 100644
index 00000000000..fc730c7b8f4
--- /dev/null
+++ b/source/blender/editors/space_outliner/tree/tree_element_label.hh
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup spoutliner
+ */
+
+#pragma once
+
+#include <string>
+
+#include "UI_resources.h"
+
+#include "tree_element.hh"
+
+namespace blender::ed::outliner {
+
+/**
+ * A basic, general purpose tree element to just display a label and an icon. Can be used to group
+ * together items underneath as well of course.
+ *
+ * Make sure to give this a unique index, so the element can be identified uniquely. Otherwise
+ * glitches like multiple highlighted elements happen, that share all state (e.g. collapsed,
+ * selected, etc.).
+ */
+class TreeElementLabel final : public AbstractTreeElement {
+  const std::string label_;
+  BIFIconID icon_ = ICON_NONE;
+
+ public:
+  TreeElementLabel(TreeElement &legacy_te, const char *label);
+
+  void setIcon(BIFIconID icon);
+  std::optional<BIFIconID> getIcon() const override;
+};
+
+}  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_element_overrides.cc b/source/blender/editors/space_outliner/tree/tree_element_overrides.cc
index d1babda642e..11067d37966 100644
--- a/source/blender/editors/space_outliner/tree/tree_element_overrides.cc
+++ b/source/blender/editors/space_outliner/tree/tree_element_overrides.cc
@@ -7,30 +7,60 @@
 #include "BKE_collection.h"
 #include "BKE_lib_override.h"
 
-#include "BLI_utildefines.h"
-
+#include "BLI_function_ref.hh"
 #include "BLI_listbase_wrapper.hh"
+#include "BLI_map.hh"
+#include "BLI_utildefines.h"
 
 #include "BLT_translation.h"
 
 #include "DNA_space_types.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "../outliner_intern.hh"
 
+#include "tree_element_label.hh"
 #include "tree_element_overrides.hh"
 
 namespace blender::ed::outliner {
 
+class OverrideRNAPathTreeBuilder {
+  SpaceOutliner &space_outliner_;
+  Map<std::string, TreeElement *> path_te_map;
+
+ public:
+  OverrideRNAPathTreeBuilder(SpaceOutliner &space_outliner);
+  void build_path(TreeElement &parent, TreeElementOverridesData &override_data, short &index);
+
+ private:
+  TreeElement &ensure_label_element_for_prop(
+      TreeElement &parent, StringRef elem_path, PointerRNA &ptr, PropertyRNA &prop, short &index);
+  TreeElement &ensure_label_element_for_ptr(TreeElement &parent,
+                                            StringRef elem_path,
+                                            PointerRNA &ptr,
+                                            short &index);
+  void ensure_entire_collection(TreeElement &te_to_expand,
+                                const TreeElementOverridesData &override_data,
+                                const char *coll_prop_path,
+                                short &index);
+};
+
+/* -------------------------------------------------------------------- */
+/** \name Base Element
+ *
+ * Represents an ID that has overridden properties. The expanding will invoke building of tree
+ * elements for the full RNA path of the property.
+ *
+ * \{ */
+
 TreeElementOverridesBase::TreeElementOverridesBase(TreeElement &legacy_te, ID &id)
     : AbstractTreeElement(legacy_te), id(id)
 {
   BLI_assert(legacy_te.store_elem->type == TSE_LIBRARY_OVERRIDE_BASE);
   if (legacy_te.parent != nullptr &&
-      ELEM(legacy_te.parent->store_elem->type, TSE_SOME_ID, TSE_LAYER_COLLECTION))
-
-  {
+      ELEM(legacy_te.parent->store_elem->type, TSE_SOME_ID, TSE_LAYER_COLLECTION)) {
     legacy_te.name = IFACE_("Library Overrides");
   }
   else {
@@ -51,21 +81,17 @@ StringRefNull TreeElementOverridesBase::getWarning() const
   return {};
 }
 
-void TreeElementOverridesBase::expand(SpaceOutliner &space_outliner) const
+static void iterate_properties_to_display(ID &id,
+                                          const bool show_system_overrides,
+                                          FunctionRef<void(TreeElementOverridesData &data)> fn)
 {
-  BLI_assert(id.override_library != nullptr);
+  PointerRNA override_rna_ptr;
+  PropertyRNA *override_rna_prop;
 
-  const bool show_system_overrides = (SUPPORT_FILTER_OUTLINER(&space_outliner) &&
-                                      (space_outliner.filter & SO_FILTER_SHOW_SYSTEM_OVERRIDES) !=
-                                          0);
   PointerRNA idpoin;
   RNA_id_pointer_create(&id, &idpoin);
 
-  PointerRNA override_rna_ptr;
-  PropertyRNA *override_rna_prop;
-  short index = 0;
-
-  for (auto *override_prop :
+  for (IDOverrideLibraryProperty *override_prop :
        ListBaseWrapper<IDOverrideLibraryProperty>(id.override_library->properties)) {
     int rnaprop_index = 0;
     const bool is_rna_path_valid = BKE_lib_override_rna_property_find(
@@ -80,7 +106,7 @@ void TreeElementOverridesBase::expand(SpaceOutliner &space_outliner) const
       /* Matching ID pointers are considered as system overrides. */
       if (ELEM(override_prop->rna_prop_type, PROP_POINTER, PROP_COLLECTION) &&
           RNA_struct_is_ID(RNA_property_pointer_type(&override_rna_ptr, override_rna_prop))) {
-        for (auto *override_prop_op :
+        for (IDOverrideLibraryPropertyOperation *override_prop_op :
              ListBaseWrapper<IDOverrideLibraryPropertyOperation>(override_prop->operations)) {
           if ((override_prop_op->flag & IDOVERRIDE_LIBRARY_FLAG_IDPOINTER_MATCH_REFERENCE) == 0) {
             do_skip = false;
@@ -103,11 +129,36 @@ void TreeElementOverridesBase::expand(SpaceOutliner &space_outliner) const
 
     TreeElementOverridesData data = {
         id, *override_prop, override_rna_ptr, *override_rna_prop, is_rna_path_valid};
-    outliner_add_element(
-        &space_outliner, &legacy_te_.subtree, &data, &legacy_te_, TSE_LIBRARY_OVERRIDE, index++);
+
+    fn(data);
   }
 }
 
+void TreeElementOverridesBase::expand(SpaceOutliner &space_outliner) const
+{
+  BLI_assert(id.override_library != nullptr);
+
+  const bool show_system_overrides = (SUPPORT_FILTER_OUTLINER(&space_outliner) &&
+                                      (space_outliner.filter & SO_FILTER_SHOW_SYSTEM_OVERRIDES) !=
+                                          0);
+
+  OverrideRNAPathTreeBuilder path_builder(space_outliner);
+  short index = 0;
+
+  iterate_properties_to_display(id, show_system_overrides, [&](TreeElementOverridesData &data) {
+    path_builder.build_path(legacy_te_, data, index);
+  });
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Overridden Property
+ *
+ * Represents an RNA property that was overridden.
+ *
+ * \{ */
+
 TreeElementOverridesProperty::TreeElementOverridesProperty(TreeElement &legacy_te,
                                                            TreeElementOverridesData &override_data)
     : AbstractTreeElement(legacy_te),
@@ -116,9 +167,10 @@ TreeElementOverridesProperty::TreeElementOverridesProperty(TreeElement &legacy_t
       rna_path(override_data.override_property.rna_path),
       is_rna_path_valid(override_data.is_rna_path_valid)
 {
-  BLI_assert(legacy_te.store_elem->type == TSE_LIBRARY_OVERRIDE);
+  BLI_assert(
+      ELEM(legacy_te.store_elem->type, TSE_LIBRARY_OVERRIDE, TSE_LIBRARY_OVERRIDE_OPERATION));
 
-  legacy_te.name = override_data.override_property.rna_path;
+  legacy_te.name = RNA_property_ui_name(&override_data.override_rna_prop);
 }
 
 StringRefNull TreeElementOverridesProperty::getWarning() const
@@ -132,4 +184,305 @@ StringRefNull TreeElementOverridesProperty::getWarning() const
   return {};
 }
 
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Overridden Property Operation
+ *
+ * See #TreeElementOverridesPropertyOperation.
+ * \{ */
+
+TreeElementOverridesPropertyOperation::TreeElementOverridesPropertyOperation(
+    TreeElement &legacy_te, TreeElementOverridesData &override_data)
+    : TreeElementOverridesProperty(legacy_te, override_data)
+{
+  BLI_assert(legacy_te.store_elem->type == TSE_LIBRARY_OVERRIDE_OPERATION);
+  BLI_assert_msg(RNA_property_type(&override_rna_prop) == PROP_COLLECTION,
+                 "Override operations are only supported for collections right now");
+  /* Quiet Clang Static Analyzer warning by throwing instead of asserting (possible
+   * null-dereference). */
+  if (!override_data.operation) {
+    throw std::invalid_argument("missing operation");
+  }
+
+  operation_ = std::make_unique<IDOverrideLibraryPropertyOperation>(*override_data.operation);
+  /* Just for extra sanity. */
+  operation_->next = operation_->prev = nullptr;
+
+  if (std::optional<PointerRNA> col_item_ptr = get_collection_ptr()) {
+    const char *dyn_name = RNA_struct_name_get_alloc(&*col_item_ptr, nullptr, 0, nullptr);
+    if (dyn_name) {
+      legacy_te.name = dyn_name;
+      legacy_te.flag |= TE_FREE_NAME;
+    }
+    else {
+      legacy_te.name = RNA_struct_ui_name(col_item_ptr->type);
+    }
+  }
+}
+
+StringRefNull TreeElementOverridesPropertyOperation::getOverrideOperationLabel() const
+{
+  if (ELEM(operation_->operation,
+           IDOVERRIDE_LIBRARY_OP_INSERT_AFTER,
+           IDOVERRIDE_LIBRARY_OP_INSERT_BEFORE)) {
+    return TIP_("Added through override");
+  }
+
+  BLI_assert_unreachable();
+  return {};
+}
+
+std::optional<BIFIconID> TreeElementOverridesPropertyOperation::getIcon() const
+{
+  if (const std::optional<PointerRNA> col_item_ptr = get_collection_ptr()) {
+    return (BIFIconID)RNA_struct_ui_icon(col_item_ptr->type);
+  }
+
+  return {};
+}
+
+std::optional<PointerRNA> TreeElementOverridesPropertyOperation::get_collection_ptr() const
+{
+  PointerRNA col_item_ptr;
+  if (RNA_property_collection_lookup_int(const_cast<PointerRNA *>(&override_rna_ptr),
+                                         &override_rna_prop,
+                                         operation_->subitem_local_index,
+                                         &col_item_ptr)) {
+    return col_item_ptr;
+  }
+
+  return {};
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Helper to build a hierarchy from an RNA path.
+ *
+ * Builds a nice hierarchy representing the nested structs of the override property's RNA path
+ * using UI names and icons. For example `animation_visualization_mothion_path.frame_end` becomes:
+ * - Animation Visualization
+ *   - Motion Paths
+ *     - End Frame
+ *
+ * Paths are merged so that each RNA sub-path is only represented once in the tree. So there is
+ * some finicky path building going on to create a path -> tree-element map.
+ *
+ * This is more complicated than you'd think it needs to be. Mostly because of RNA collection
+ * overrides:
+ * - A single override may add (and in future remove) multiple collection items. So all operations
+ *   of the override have to be considered.
+ * - The order of collection items may matter (e.g. for modifiers), so if collection items are
+ *   added/removed, we want to show all other collection items too, in the right order.
+ *
+ * - If the override is inside some collection item, the collection item has to be built, but the
+ * RNA path iterator doesn't
+ * \{ */
+
+OverrideRNAPathTreeBuilder::OverrideRNAPathTreeBuilder(SpaceOutliner &space_outliner)
+    : space_outliner_(space_outliner)
+{
+}
+
+void OverrideRNAPathTreeBuilder::build_path(TreeElement &parent,
+                                            TreeElementOverridesData &override_data,
+                                            short &index)
+{
+  PointerRNA idpoin;
+  RNA_id_pointer_create(&override_data.id, &idpoin);
+
+  ListBase path_elems = {nullptr};
+  if (!RNA_path_resolve_elements(&idpoin, override_data.override_property.rna_path, &path_elems)) {
+    return;
+  }
+
+  const char *elem_path = nullptr;
+  TreeElement *te_to_expand = &parent;
+
+  LISTBASE_FOREACH (PropertyElemRNA *, elem, &path_elems) {
+    if (!elem->next) {
+      /* The last element is added as #TSE_LIBRARY_OVERRIDE below. */
+      break;
+    }
+    const char *previous_path = elem_path;
+    const char *new_path = RNA_path_append(previous_path, &elem->ptr, elem->prop, -1, nullptr);
+
+    te_to_expand = &ensure_label_element_for_prop(
+        *te_to_expand, new_path, elem->ptr, *elem->prop, index);
+
+    /* Above the collection property was added (e.g. "Modifiers"), to get the actual collection
+     * item the path refers to, we have to peek at the following path element and add a tree
+     * element for its pointer (e.g. "My Subdiv Modifier"). */
+    if (RNA_property_type(elem->prop) == PROP_COLLECTION) {
+      const int coll_item_idx = RNA_property_collection_lookup_index(
+          &elem->ptr, elem->prop, &elem->next->ptr);
+      const char *coll_item_path = RNA_path_append(
+          previous_path, &elem->ptr, elem->prop, coll_item_idx, nullptr);
+
+      te_to_expand = &ensure_label_element_for_ptr(
+          *te_to_expand, coll_item_path, elem->next->ptr, index);
+
+      MEM_delete(new_path);
+      new_path = coll_item_path;
+    }
+
+    if (new_path) {
+      MEM_delete(elem_path);
+      elem_path = new_path;
+    }
+  }
+  BLI_freelistN(&path_elems);
+
+  /* Special case: Overriding collections, e.g. adding or removing items. In this case we add
+   * elements for all collection items to show full context, and indicate which ones were
+   * added/removed (currently added only). Note that a single collection override may add/remove
+   * multiple items. */
+  if (RNA_property_type(&override_data.override_rna_prop) == PROP_COLLECTION) {
+    /* Tree element for the actual collection item (e.g. "Modifiers"). Can just use the override
+     * ptr & prop here, since they point to the collection property (e.g. `modifiers`). */
+    te_to_expand = &ensure_label_element_for_prop(*te_to_expand,
+                                                  override_data.override_property.rna_path,
+                                                  override_data.override_rna_ptr,
+                                                  override_data.override_rna_prop,
+                                                  index);
+
+    ensure_entire_collection(*te_to_expand, override_data, elem_path, index);
+  }
+  /* Some properties have multiple operations (e.g. an array property with multiple changed
+   * values), so the element may already be present. At this point they are displayed as a single
+   * property in the tree, so don't add it multiple times here. */
+  else if (!path_te_map.contains(override_data.override_property.rna_path)) {
+    outliner_add_element(&space_outliner_,
+                         &te_to_expand->subtree,
+                         &override_data,
+                         te_to_expand,
+                         TSE_LIBRARY_OVERRIDE,
+                         index++);
+  }
+
+  MEM_delete(elem_path);
+}
+
+void OverrideRNAPathTreeBuilder::ensure_entire_collection(
+    TreeElement &te_to_expand,
+    const TreeElementOverridesData &override_data,
+    /* The path of the owning collection property. */
+    const char *coll_prop_path,
+    short &index)
+{
+  BLI_assert(tree_element_cast<AbstractTreeElement>(&te_to_expand) != nullptr);
+
+  TreeElement *previous_te = nullptr;
+  int item_idx = 0;
+  RNA_PROP_BEGIN (&override_data.override_rna_ptr, itemptr, &override_data.override_rna_prop) {
+    const char *coll_item_path = RNA_path_append(coll_prop_path,
+                                                 &override_data.override_rna_ptr,
+                                                 &override_data.override_rna_prop,
+                                                 item_idx,
+                                                 nullptr);
+    IDOverrideLibraryPropertyOperation *item_operation =
+        BKE_lib_override_library_property_operation_find(
+            &override_data.override_property, nullptr, nullptr, -1, item_idx, false, nullptr);
+    TreeElement *current_te = nullptr;
+
+    TreeElement *existing_te = path_te_map.lookup_default(coll_item_path, nullptr);
+
+    if (existing_te) {
+      /* Reinsert the element to make sure the order is right. It may have been inserted by a
+       * previous override. */
+      BLI_remlink(&te_to_expand.subtree, existing_te);
+      BLI_insertlinkafter(&te_to_expand.subtree, previous_te, existing_te);
+      current_te = existing_te;
+    }
+    /* Is there an operation for this item (added or removed the item to/from the collection)? If
+     * so indicate it as override using #TSE_LIBRARY_OVERRIDE_OPERATION. Otherwise it's just a
+     * regular collection we display for context. */
+    else if (item_operation) {
+      TreeElementOverridesData override_op_data = override_data;
+      override_op_data.operation = item_operation;
+
+      current_te = outliner_add_element(&space_outliner_,
+                                        &te_to_expand.subtree,
+                                        /* Element will store a copy. */
+                                        &override_op_data,
+                                        &te_to_expand,
+                                        TSE_LIBRARY_OVERRIDE_OPERATION,
+                                        index++);
+    }
+    else {
+      current_te = &ensure_label_element_for_ptr(te_to_expand, coll_item_path, itemptr, index);
+    }
+
+    MEM_delete(coll_item_path);
+    item_idx++;
+    previous_te = current_te;
+  }
+  RNA_PROP_END;
+}
+
+static BIFIconID get_property_icon(PointerRNA &ptr, PropertyRNA &prop)
+{
+  BIFIconID icon = (BIFIconID)RNA_property_ui_icon(&prop);
+  if (icon) {
+    return icon;
+  }
+
+  /* Try if the collection item type has a dedicated icon (e.g. #ICON_MODIFIER for the
+   * #Object.modifiers property). */
+  if (RNA_property_type(&prop) == PROP_COLLECTION) {
+    const StructRNA *coll_ptr_type = RNA_property_pointer_type(&ptr, &prop);
+    icon = (BIFIconID)RNA_struct_ui_icon(coll_ptr_type);
+    if (icon != ICON_DOT) {
+      return icon;
+    }
+  }
+
+  return ICON_NONE;
+}
+
+TreeElement &OverrideRNAPathTreeBuilder::ensure_label_element_for_prop(
+    TreeElement &parent, StringRef elem_path, PointerRNA &ptr, PropertyRNA &prop, short &index)
+{
+  return *path_te_map.lookup_or_add_cb(elem_path, [&]() {
+    TreeElement *new_te = outliner_add_element(&space_outliner_,
+                                               &parent.subtree,
+                                               (void *)RNA_property_ui_name(&prop),
+                                               &parent,
+                                               TSE_GENERIC_LABEL,
+                                               index++,
+                                               false);
+    TreeElementLabel *te_label = tree_element_cast<TreeElementLabel>(new_te);
+
+    te_label->setIcon(get_property_icon(ptr, prop));
+    return new_te;
+  });
+}
+
+TreeElement &OverrideRNAPathTreeBuilder::ensure_label_element_for_ptr(TreeElement &parent,
+                                                                      StringRef elem_path,
+                                                                      PointerRNA &ptr,
+                                                                      short &index)
+{
+  return *path_te_map.lookup_or_add_cb(elem_path, [&]() {
+    const char *dyn_name = RNA_struct_name_get_alloc(&ptr, nullptr, 0, nullptr);
+
+    TreeElement *new_te = outliner_add_element(
+        &space_outliner_,
+        &parent.subtree,
+        (void *)(dyn_name ? dyn_name : RNA_struct_ui_name(ptr.type)),
+        &parent,
+        TSE_GENERIC_LABEL,
+        index++);
+    TreeElementLabel *te_label = tree_element_cast<TreeElementLabel>(new_te);
+    te_label->setIcon((BIFIconID)RNA_struct_ui_icon(ptr.type));
+
+    MEM_delete(dyn_name);
+
+    return new_te;
+  });
+}
+
+/** \} */
+
 }  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_element_overrides.hh b/source/blender/editors/space_outliner/tree/tree_element_overrides.hh
index 1db46d9af1d..f8ca146a4ea 100644
--- a/source/blender/editors/space_outliner/tree/tree_element_overrides.hh
+++ b/source/blender/editors/space_outliner/tree/tree_element_overrides.hh
@@ -14,6 +14,7 @@
 
 struct ID;
 struct IDOverrideLibraryProperty;
+struct IDOverrideLibraryPropertyOperation;
 
 namespace blender::ed::outliner {
 
@@ -24,6 +25,11 @@ struct TreeElementOverridesData {
   PropertyRNA &override_rna_prop;
 
   bool is_rna_path_valid;
+
+  /* In case the property references a specific operation. Only used for collection overrides
+   * currently, where a single override may add/remove multiple collection items (only add
+   * currently). */
+  IDOverrideLibraryPropertyOperation *operation = nullptr;
 };
 
 class TreeElementOverridesBase final : public AbstractTreeElement {
@@ -38,7 +44,12 @@ class TreeElementOverridesBase final : public AbstractTreeElement {
   StringRefNull getWarning() const override;
 };
 
-class TreeElementOverridesProperty final : public AbstractTreeElement {
+/**
+ * Represent a single overridden property. Collection properties may support multiple override
+ * operations, e.g. to insert/remove multiple collection items. For these multiple operation cases,
+ * use #TreeElementOverridesPropertyOperation.
+ */
+class TreeElementOverridesProperty : public AbstractTreeElement {
  public:
   PointerRNA override_rna_ptr;
   PropertyRNA &override_rna_prop;
@@ -50,6 +61,33 @@ class TreeElementOverridesProperty final : public AbstractTreeElement {
   TreeElementOverridesProperty(TreeElement &legacy_te, TreeElementOverridesData &override_data);
 
   StringRefNull getWarning() const override;
+
+  bool isCollectionOperation() const;
+};
+
+/**
+ * Represent a single operation within an overridden property. While usually a single override
+ * property represents a single operation (changing the value), a single overridden collection
+ * property may have multiple operations, e.g. to insert or remove collection items.
+ *
+ * Inherits from the override property class since it should look/behave mostly the same.
+ */
+class TreeElementOverridesPropertyOperation final : public TreeElementOverridesProperty {
+  /** See #TreeElementOverridesData::operation. Operations are recreated as part of the diffing
+   * (e.g. on undo pushes) so store a copy of the data here. */
+  std::unique_ptr<IDOverrideLibraryPropertyOperation> operation_;
+
+ public:
+  TreeElementOverridesPropertyOperation(TreeElement &legacy_te,
+                                        TreeElementOverridesData &override_data);
+
+  /** Return a short string to display in the right column of the properties mode, indicating what
+   * the override operation did (e.g. added or removed a collection item). */
+  StringRefNull getOverrideOperationLabel() const;
+  std::optional<BIFIconID> getIcon() const override;
+
+ private:
+  std::optional<PointerRNA> get_collection_ptr() const;
 };
 
 }  // namespace blender::ed::outliner
diff --git a/source/blender/editors/space_outliner/tree/tree_element_rna.cc b/source/blender/editors/space_outliner/tree/tree_element_rna.cc
index 914104f1f06..9e1f22b49d6 100644
--- a/source/blender/editors/space_outliner/tree/tree_element_rna.cc
+++ b/source/blender/editors/space_outliner/tree/tree_element_rna.cc
@@ -117,14 +117,14 @@ void TreeElementRNAStruct::expand(SpaceOutliner &space_outliner) const
     for (int index = 0; index < tot; index++) {
       PointerRNA propptr;
       RNA_property_collection_lookup_int(&ptr, iterprop, index, &propptr);
-      if (!(RNA_property_flag(reinterpret_cast<PropertyRNA *>(propptr.data)) & PROP_HIDDEN)) {
+      if (!(RNA_property_flag(static_cast<PropertyRNA *>(propptr.data)) & PROP_HIDDEN)) {
         outliner_add_element(
             &space_outliner, &legacy_te_.subtree, &ptr, &legacy_te_, TSE_RNA_PROPERTY, index);
       }
     }
   }
   else if (tot) {
-    legacy_te_.flag |= TE_LAZY_CLOSED;
+    legacy_te_.flag |= TE_PRETEND_HAS_CHILDREN;
   }
 }
 
@@ -146,7 +146,7 @@ TreeElementRNAProperty::TreeElementRNAProperty(TreeElement &legacy_te,
   PropertyRNA *iterprop = RNA_struct_iterator_property(rna_ptr.type);
   RNA_property_collection_lookup_int(&rna_ptr, iterprop, index, &propptr);
 
-  PropertyRNA *prop = reinterpret_cast<PropertyRNA *>(propptr.data);
+  PropertyRNA *prop = static_cast<PropertyRNA *>(propptr.data);
 
   legacy_te_.name = RNA_property_ui_name(prop);
   rna_prop_ = prop;
@@ -172,7 +172,7 @@ void TreeElementRNAProperty::expand(SpaceOutliner &space_outliner) const
             &space_outliner, &legacy_te_.subtree, &pptr, &legacy_te_, TSE_RNA_STRUCT, -1);
       }
       else {
-        legacy_te_.flag |= TE_LAZY_CLOSED;
+        legacy_te_.flag |= TE_PRETEND_HAS_CHILDREN;
       }
     }
   }
@@ -189,7 +189,7 @@ void TreeElementRNAProperty::expand(SpaceOutliner &space_outliner) const
       }
     }
     else if (tot) {
-      legacy_te_.flag |= TE_LAZY_CLOSED;
+      legacy_te_.flag |= TE_PRETEND_HAS_CHILDREN;
     }
   }
   else if (ELEM(proptype, PROP_BOOLEAN, PROP_INT, PROP_FLOAT)) {
@@ -207,7 +207,7 @@ void TreeElementRNAProperty::expand(SpaceOutliner &space_outliner) const
       }
     }
     else if (tot) {
-      legacy_te_.flag |= TE_LAZY_CLOSED;
+      legacy_te_.flag |= TE_PRETEND_HAS_CHILDREN;
     }
   }
 }
@@ -232,8 +232,7 @@ TreeElementRNAArrayElement::TreeElementRNAArrayElement(TreeElement &legacy_te,
 
   char c = RNA_property_array_item_char(TreeElementRNAArrayElement::getPropertyRNA(), index);
 
-  legacy_te_.name = reinterpret_cast<char *>(
-      MEM_callocN(sizeof(char[20]), "OutlinerRNAArrayName"));
+  legacy_te_.name = static_cast<char *>(MEM_callocN(sizeof(char[20]), "OutlinerRNAArrayName"));
   if (c) {
     sprintf((char *)legacy_te_.name, "  %c", c);
   }
diff --git a/source/blender/editors/space_outliner/tree/tree_iterator.hh b/source/blender/editors/space_outliner/tree/tree_iterator.hh
index de5bcd2c462..0c94c2f95cf 100644
--- a/source/blender/editors/space_outliner/tree/tree_iterator.hh
+++ b/source/blender/editors/space_outliner/tree/tree_iterator.hh
@@ -10,9 +10,11 @@
 
 struct ListBase;
 struct SpaceOutliner;
-struct TreeElement;
 
 namespace blender::ed::outliner {
+
+struct TreeElement;
+
 namespace tree_iterator {
 
 using VisitorFn = FunctionRef<void(TreeElement *)>;
diff --git a/source/blender/editors/space_script/CMakeLists.txt b/source/blender/editors/space_script/CMakeLists.txt
index 8486fa0e872..f7fc4e38c17 100644
--- a/source/blender/editors/space_script/CMakeLists.txt
+++ b/source/blender/editors/space_script/CMakeLists.txt
@@ -8,7 +8,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 )
 
diff --git a/source/blender/editors/space_script/script_edit.c b/source/blender/editors/space_script/script_edit.c
index e8c7590c1fe..a32c8a3f85a 100644
--- a/source/blender/editors/space_script/script_edit.c
+++ b/source/blender/editors/space_script/script_edit.c
@@ -100,7 +100,7 @@ static int script_reload_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  /* TODO(campbell): this crashes on netrender and keying sets, need to look into why
+  /* TODO(@campbellbarton): this crashes on netrender and keying sets, need to look into why
    * disable for now unless running in debug mode. */
 
   /* It would be nice if we could detect when this is called from the Python
diff --git a/source/blender/editors/space_script/space_script.c b/source/blender/editors/space_script/space_script.c
index a623b98f1b1..c35b1e00184 100644
--- a/source/blender/editors/space_script/space_script.c
+++ b/source/blender/editors/space_script/space_script.c
@@ -152,7 +152,7 @@ void ED_spacetype_script(void)
   ARegionType *art;
 
   st->spaceid = SPACE_SCRIPT;
-  strncpy(st->name, "Script", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Script");
 
   st->create = script_create;
   st->free = script_free;
diff --git a/source/blender/editors/space_sequencer/CMakeLists.txt b/source/blender/editors/space_sequencer/CMakeLists.txt
index 44f919ca361..deaec0136c4 100644
--- a/source/blender/editors/space_sequencer/CMakeLists.txt
+++ b/source/blender/editors/space_sequencer/CMakeLists.txt
@@ -15,7 +15,6 @@ set(INC
   ../../sequencer
   ../../windowmanager
   ../../../../intern/atomic
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_sequencer/sequencer_drag_drop.c b/source/blender/editors/space_sequencer/sequencer_drag_drop.c
index f6561cf07b9..c892e7d7e55 100644
--- a/source/blender/editors/space_sequencer/sequencer_drag_drop.c
+++ b/source/blender/editors/space_sequencer/sequencer_drag_drop.c
@@ -51,7 +51,9 @@
 typedef struct SeqDropCoords {
   float start_frame, channel;
   int strip_len, channel_len;
+  float playback_rate;
   bool in_use;
+  bool has_read_mouse_pos;
   bool is_intersecting;
   bool use_snapping;
   float snap_point_x;
@@ -63,7 +65,7 @@ typedef struct SeqDropCoords {
  * preloading data on drag start.
  * Therefore we will for now use a global variable for this.
  */
-static SeqDropCoords g_drop_coords = {.in_use = false};
+static SeqDropCoords g_drop_coords = {.in_use = false, .has_read_mouse_pos = false};
 
 static void generic_poll_operations(const wmEvent *event, uint8_t type)
 {
@@ -82,31 +84,134 @@ static bool image_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *ev
     }
   }
 
-  return WM_drag_is_ID_type(drag, ID_IM);
+  if (WM_drag_is_ID_type(drag, ID_IM)) {
+    generic_poll_operations(event, TH_SEQ_IMAGE);
+    return true;
+  }
+
+  return false;
 }
 
-static bool movie_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *event)
+static bool is_movie(wmDrag *drag)
 {
   if (drag->type == WM_DRAG_PATH) {
-    if (ELEM(drag->icon, 0, ICON_FILE_MOVIE, ICON_FILE_BLANK)) { /* Rule might not work? */
-      generic_poll_operations(event, TH_SEQ_MOVIE);
+    if (ELEM(drag->icon, ICON_FILE_MOVIE, ICON_FILE_BLANK)) { /* Rule might not work? */
       return true;
     }
   }
+  if (WM_drag_is_ID_type(drag, ID_MC)) {
+    return true;
+  }
+  return false;
+}
+
+static bool movie_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *event)
+{
+  if (is_movie(drag)) {
+    generic_poll_operations(event, TH_SEQ_MOVIE);
+    return true;
+  }
 
-  return WM_drag_is_ID_type(drag, ID_MC);
+  return false;
 }
 
-static bool sound_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *event)
+static bool is_sound(wmDrag *drag)
 {
   if (drag->type == WM_DRAG_PATH) {
     if (ELEM(drag->icon, ICON_FILE_SOUND, ICON_FILE_BLANK)) { /* Rule might not work? */
-      generic_poll_operations(event, TH_SEQ_AUDIO);
       return true;
     }
   }
+  if (WM_drag_is_ID_type(drag, ID_SO)) {
+    return true;
+  }
+  return false;
+}
 
-  return WM_drag_is_ID_type(drag, ID_SO);
+static bool sound_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *event)
+{
+  if (is_sound(drag)) {
+    generic_poll_operations(event, TH_SEQ_AUDIO);
+    return true;
+  }
+
+  return false;
+}
+
+static float update_overlay_strip_position_data(bContext *C, const int mval[2])
+{
+  SeqDropCoords *coords = &g_drop_coords;
+  ARegion *region = CTX_wm_region(C);
+  Scene *scene = CTX_data_scene(C);
+  int hand;
+  View2D *v2d = &region->v2d;
+
+  /* Update the position were we would place the strip if we complete the drag and drop action.
+   */
+  UI_view2d_region_to_view(v2d, mval[0], mval[1], &coords->start_frame, &coords->channel);
+  coords->start_frame = roundf(coords->start_frame);
+  if (coords->channel < 1.0f) {
+    coords->channel = 1;
+  }
+
+  float start_frame = coords->start_frame;
+  float end_frame;
+  float strip_len;
+
+  if (coords->playback_rate != 0.0f) {
+    float scene_playback_rate = (float)scene->r.frs_sec / scene->r.frs_sec_base;
+    strip_len = coords->strip_len / (coords->playback_rate / scene_playback_rate);
+  }
+  else {
+    strip_len = coords->strip_len;
+  }
+
+  end_frame = coords->start_frame + strip_len;
+
+  if (coords->use_snapping) {
+    /* Do snapping via the existing transform code. */
+    int snap_delta;
+    float snap_frame;
+    bool valid_snap;
+
+    valid_snap = ED_transform_snap_sequencer_to_closest_strip_calc(
+        scene, region, start_frame, end_frame, &snap_delta, &snap_frame);
+
+    if (valid_snap) {
+      /* We snapped onto something! */
+      start_frame += snap_delta;
+      coords->start_frame = start_frame;
+      end_frame = start_frame + strip_len;
+      coords->snap_point_x = snap_frame;
+    }
+    else {
+      /* Nothing was snapped to, disable snap drawing. */
+      coords->use_snapping = false;
+    }
+  }
+
+  if (strip_len < 1) {
+    /* Only check if there is a strip already under the mouse cursor. */
+    coords->is_intersecting = find_nearest_seq(scene, &region->v2d, &hand, mval);
+  }
+  else {
+    /* Check if there is a strip that would intersect with the new strip(s). */
+    coords->is_intersecting = false;
+    Sequence dummy_seq = {.machine = coords->channel,
+                          .start = coords->start_frame,
+                          .len = coords->strip_len,
+                          .speed_factor = 1.0f,
+                          .media_playback_rate = coords->playback_rate,
+                          .flag = SEQ_AUTO_PLAYBACK_RATE};
+    Editing *ed = SEQ_editing_ensure(scene);
+
+    for (int i = 0; i < coords->channel_len && !coords->is_intersecting; i++) {
+      coords->is_intersecting = SEQ_transform_test_overlap(scene, ed->seqbasep, &dummy_seq);
+      dummy_seq.machine++;
+    }
+  }
+
+  return strip_len;
 }
 
 static void sequencer_drop_copy(bContext *C, wmDrag *drag, wmDropBox *drop)
@@ -153,93 +258,77 @@ static void sequencer_drop_copy(bContext *C, wmDrag *drag, wmDropBox *drop)
       RNA_collection_add(drop->ptr, "files", &itemptr);
       RNA_string_set(&itemptr, "name", file);
     }
-
-    if (g_drop_coords.in_use) {
-      RNA_int_set(drop->ptr, "frame_start", g_drop_coords.start_frame);
-      RNA_int_set(drop->ptr, "channel", g_drop_coords.channel);
-      RNA_boolean_set(drop->ptr, "overlap_shuffle_override", true);
-    }
-    else {
-      Scene *scene = CTX_data_scene(C);
-      Editing *ed = SEQ_editing_get(scene);
-      ListBase *seqbase = SEQ_active_seqbase_get(ed);
-      ListBase *channels = SEQ_channels_displayed_get(ed);
-      SpaceSeq *sseq = CTX_wm_space_seq(C);
-
-      SeqCollection *strips = SEQ_query_rendered_strips(
-          scene, channels, seqbase, scene->r.cfra, sseq->chanshown);
-
-      /* Get the top most strip channel that is in view.*/
-      Sequence *seq;
-      int max_channel = -1;
-      SEQ_ITERATOR_FOREACH (seq, strips) {
-        max_channel = max_ii(seq->machine, max_channel);
-      }
-
-      if (max_channel != -1) {
-        RNA_int_set(drop->ptr, "channel", max_channel);
-      }
-      SEQ_collection_free(strips);
-    }
   }
-}
 
-static void update_overlay_strip_poistion_data(bContext *C, const int mval[2])
-{
-  SeqDropCoords *coords = &g_drop_coords;
-  ARegion *region = CTX_wm_region(C);
-  Scene *scene = CTX_data_scene(C);
-  int hand;
-  View2D *v2d = &region->v2d;
+  if (g_drop_coords.in_use) {
+    if (!g_drop_coords.has_read_mouse_pos) {
+      /* We didn't read the mouse position, so we need to do it manually here. */
+      int xy[2];
+      wmWindow *win = CTX_wm_window(C);
+      xy[0] = win->eventstate->xy[0];
+      xy[1] = win->eventstate->xy[1];
+
+      ARegion *region = CTX_wm_region(C);
+      int mval[2];
+      /* Convert mouse coordinates to region local coordinates. */
+      mval[0] = xy[0] - region->winrct.xmin;
+      mval[1] = xy[1] - region->winrct.ymin;
+
+      update_overlay_strip_position_data(C, mval);
+    }
 
-  /* Update the position were we would place the strip if we complete the drag and drop action.
-   */
-  UI_view2d_region_to_view(v2d, mval[0], mval[1], &coords->start_frame, &coords->channel);
-  coords->start_frame = roundf(coords->start_frame);
-  if (coords->channel < 1.0f) {
-    coords->channel = 1;
+    RNA_int_set(drop->ptr, "frame_start", g_drop_coords.start_frame);
+    RNA_int_set(drop->ptr, "channel", g_drop_coords.channel);
+    RNA_boolean_set(drop->ptr, "overlap_shuffle_override", true);
   }
+  else {
+    /* We are dropped inside the preview region. Put the strip on top of the
+     * current displayed frame. */
+    Scene *scene = CTX_data_scene(C);
+    Editing *ed = SEQ_editing_get(scene);
+    ListBase *seqbase = SEQ_active_seqbase_get(ed);
+    ListBase *channels = SEQ_channels_displayed_get(ed);
+    SpaceSeq *sseq = CTX_wm_space_seq(C);
 
-  float start_frame = coords->start_frame;
-  float end_frame = coords->start_frame + coords->strip_len;
-
-  if (coords->use_snapping) {
-    /* Do snapping via the existing transform code. */
-    int snap_delta;
-    float snap_frame;
-    bool valid_snap;
-
-    valid_snap = ED_transform_snap_sequencer_to_closest_strip_calc(
-        scene, region, start_frame, end_frame, &snap_delta, &snap_frame);
+    SeqCollection *strips = SEQ_query_rendered_strips(
+        scene, channels, seqbase, scene->r.cfra, sseq->chanshown);
 
-    if (valid_snap) {
-      /* We snapped onto something! */
-      start_frame += snap_delta;
-      coords->start_frame = start_frame;
-      end_frame = start_frame + coords->strip_len;
-      coords->snap_point_x = snap_frame;
+    /* Get the top most strip channel that is in view. */
+    Sequence *seq;
+    int max_channel = -1;
+    SEQ_ITERATOR_FOREACH (seq, strips) {
+      max_channel = max_ii(seq->machine, max_channel);
     }
-    else {
-      /* Nothing was snapped to, disable snap drawing. */
-      coords->use_snapping = false;
+
+    if (max_channel != -1) {
+      RNA_int_set(drop->ptr, "channel", max_channel);
     }
+    SEQ_collection_free(strips);
   }
+}
 
-  if (coords->strip_len < 1) {
-    /* Only check if there is a strip already under the mouse cursor. */
-    coords->is_intersecting = find_nearest_seq(scene, &region->v2d, &hand, mval);
+static void get_drag_path(wmDrag *drag, char r_path[FILE_MAX])
+{
+  ID *id = WM_drag_get_local_ID_or_import_from_asset(drag, 0);
+  /* ID dropped. */
+  if (id != NULL) {
+    const ID_Type id_type = GS(id->name);
+    if (id_type == ID_IM) {
+      Image *ima = (Image *)id;
+      BLI_strncpy(r_path, ima->filepath, FILE_MAX);
+    }
+    else if (id_type == ID_MC) {
+      MovieClip *clip = (MovieClip *)id;
+      BLI_strncpy(r_path, clip->filepath, FILE_MAX);
+    }
+    else if (id_type == ID_SO) {
+      bSound *sound = (bSound *)id;
+      BLI_strncpy(r_path, sound->filepath, FILE_MAX);
+    }
+    BLI_path_abs(r_path, BKE_main_blendfile_path_from_global());
   }
   else {
-    /* Check if there is a strip that would intersect with the new strip(s). */
-    coords->is_intersecting = false;
-    Sequence dummy_seq = {
-        .machine = coords->channel, .start = coords->start_frame, .len = coords->strip_len};
-    Editing *ed = SEQ_editing_ensure(scene);
-
-    for (int i = 0; i < coords->channel_len && !coords->is_intersecting; i++) {
-      coords->is_intersecting = SEQ_transform_test_overlap(scene, ed->seqbasep, &dummy_seq);
-      dummy_seq.machine++;
-    }
+    BLI_strncpy(r_path, drag->path, FILE_MAX);
   }
 }
 
@@ -256,7 +345,7 @@ static void draw_seq_in_view(bContext *C, wmWindow *UNUSED(win), wmDrag *drag, c
   mval[0] = xy[0] - region->winrct.xmin;
   mval[1] = xy[1] - region->winrct.ymin;
 
-  update_overlay_strip_poistion_data(C, mval);
+  float strip_len = update_overlay_strip_position_data(C, mval);
 
   GPU_matrix_push();
   UI_view2d_view_ortho(&region->v2d);
@@ -276,11 +365,11 @@ static void draw_seq_in_view(bContext *C, wmWindow *UNUSED(win), wmDrag *drag, c
   GPU_blend(GPU_BLEND_ALPHA);
   GPU_line_smooth(true);
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw strips. The code here is taken from sequencer_draw. */
   float x1 = coords->start_frame;
-  float x2 = coords->start_frame + coords->strip_len;
+  float x2 = coords->start_frame + floorf(strip_len);
   float strip_color[3];
   uchar text_color[4] = {255, 255, 255, 255};
   float pixelx = BLI_rctf_size_x(&region->v2d.cur) / BLI_rcti_size_x(&region->v2d.mask);
@@ -354,21 +443,22 @@ static void draw_seq_in_view(bContext *C, wmWindow *UNUSED(win), wmDrag *drag, c
     const char *text_array[5];
     char text_display[FILE_MAX];
     char filename[FILE_MAX];
-    char rel_path[FILE_MAX];
+    char path[FILE_MAX];
     char strip_duration_text[16];
     int len_text_arr = 0;
 
+    get_drag_path(drag, path);
+
     if (sseq->timeline_overlay.flag & SEQ_TIMELINE_SHOW_STRIP_NAME) {
-      BLI_split_file_part(drag->path, filename, FILE_MAX);
+      BLI_split_file_part(path, filename, FILE_MAX);
       text_array[len_text_arr++] = filename;
     }
 
     if (sseq->timeline_overlay.flag & SEQ_TIMELINE_SHOW_STRIP_SOURCE) {
       Main *bmain = CTX_data_main(C);
-      BLI_strncpy(rel_path, drag->path, FILE_MAX);
-      BLI_path_rel(rel_path, BKE_main_blendfile_path(bmain));
+      BLI_path_rel(path, BKE_main_blendfile_path(bmain));
       text_array[len_text_arr++] = text_sep;
-      text_array[len_text_arr++] = rel_path;
+      text_array[len_text_arr++] = path;
     }
 
     if (sseq->timeline_overlay.flag & SEQ_TIMELINE_SHOW_STRIP_DURATION) {
@@ -442,6 +532,14 @@ static void prefetch_data_fn(void *custom_data,
 
   if (anim != NULL) {
     g_drop_coords.strip_len = IMB_anim_get_duration(anim, IMB_TC_NONE);
+    short frs_sec;
+    float frs_sec_base;
+    if (IMB_anim_get_fps(anim, &frs_sec, &frs_sec_base, true)) {
+      g_drop_coords.playback_rate = (float)frs_sec / frs_sec_base;
+    }
+    else {
+      g_drop_coords.playback_rate = 0;
+    }
     IMB_free_anim(anim);
 #ifdef WITH_AUDASPACE
     /* Try to load sound and see if the video has a sound channel. */
@@ -464,7 +562,7 @@ static void free_prefetch_data_fn(void *custom_data)
   MEM_freeN(job_data);
 }
 
-static void start_audio_video_job(bContext *C, char *path, bool only_audio)
+static void start_audio_video_job(bContext *C, wmDrag *drag, bool only_audio)
 {
   g_drop_coords.strip_len = 0;
   g_drop_coords.channel_len = 1;
@@ -478,8 +576,8 @@ static void start_audio_video_job(bContext *C, char *path, bool only_audio)
 
   DropJobData *job_data = (DropJobData *)MEM_mallocN(sizeof(DropJobData),
                                                      "SeqDragDropPreviewData");
+  get_drag_path(drag, job_data->path);
 
-  BLI_strncpy(job_data->path, path, FILE_MAX);
   job_data->only_audio = only_audio;
   job_data->scene_fps = FPS;
 
@@ -492,15 +590,15 @@ static void start_audio_video_job(bContext *C, char *path, bool only_audio)
 
 static void video_prefetch(bContext *C, wmDrag *drag)
 {
-  if (drag->type == WM_DRAG_PATH && ELEM(drag->icon, ICON_FILE_MOVIE, ICON_FILE_BLANK)) {
-    start_audio_video_job(C, drag->path, false);
+  if (is_movie(drag)) {
+    start_audio_video_job(C, drag, false);
   }
 }
 
 static void audio_prefetch(bContext *C, wmDrag *drag)
 {
-  if (drag->type == WM_DRAG_PATH && ELEM(drag->icon, ICON_FILE_SOUND, ICON_FILE_BLANK)) {
-    start_audio_video_job(C, drag->path, true);
+  if (is_sound(drag)) {
+    start_audio_video_job(C, drag, true);
   }
 }
 
@@ -534,6 +632,7 @@ static void sequencer_drop_draw_deactivate(struct wmDropBox *drop, wmDrag *UNUSE
   SeqDropCoords *coords = drop->draw_data;
   if (coords) {
     coords->in_use = false;
+    coords->has_read_mouse_pos = false;
     drop->draw_data = NULL;
   }
 }
diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index 4b9ff1e170e..71804d29e6b 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -241,327 +241,282 @@ typedef struct WaveVizData {
   float pos[2];
   float rms_pos;
   bool clip;
-  bool end;
+  bool draw_line;    /* Draw triangle otherwise. */
+  bool final_sample; /* There are no more samples. */
 } WaveVizData;
 
-static int get_section_len(WaveVizData *start, WaveVizData *end)
+static bool seq_draw_waveforms_poll(const bContext *UNUSED(C), SpaceSeq *sseq, Sequence *seq)
 {
-  int len = 0;
-  while (start != end) {
-    len++;
-    if (start->end) {
-      return len;
-    }
-    start++;
-  }
-  return len;
-}
+  const bool strip_is_valid = seq->type == SEQ_TYPE_SOUND_RAM && seq->sound != NULL;
+  const bool overlays_enabled = (sseq->flag & SEQ_SHOW_OVERLAY) != 0;
+  const bool ovelay_option = ((sseq->timeline_overlay.flag & SEQ_TIMELINE_ALL_WAVEFORMS) != 0 ||
+                              (seq->flag & SEQ_AUDIO_DRAW_WAVEFORM));
 
-static void draw_waveform(WaveVizData *iter, WaveVizData *end, GPUPrimType prim_type, bool use_rms)
-{
-  int strip_len = get_section_len(iter, end);
-  if (strip_len > 1) {
-    GPU_blend(GPU_BLEND_ALPHA);
-    GPUVertFormat *format = immVertexFormat();
-    uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
+  if ((sseq->timeline_overlay.flag & SEQ_TIMELINE_NO_WAVEFORMS) != 0) {
+    return false;
+  }
 
-    immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
-    immBegin(prim_type, strip_len);
+  if (strip_is_valid && overlays_enabled && ovelay_option) {
+    return true;
+  }
 
-    while (iter != end) {
-      if (iter->clip) {
-        immAttr4f(col, 1.0f, 0.0f, 0.0f, 0.5f);
-      }
-      else if (use_rms) {
-        immAttr4f(col, 1.0f, 1.0f, 1.0f, 0.8f);
-      }
-      else {
-        immAttr4f(col, 1.0f, 1.0f, 1.0f, 0.5f);
-      }
+  return false;
+}
 
-      if (use_rms) {
-        immVertex2f(pos, iter->pos[0], iter->rms_pos);
-      }
-      else {
-        immVertex2f(pos, iter->pos[0], iter->pos[1]);
-      }
+static void waveform_job_start_if_needed(const bContext *C, Sequence *seq)
+{
+  bSound *sound = seq->sound;
 
-      if (iter->end) {
-        /* End of line. */
-        iter++;
-        strip_len = get_section_len(iter, end);
-        if (strip_len != 0) {
-          immEnd();
-          immUnbindProgram();
-          immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
-          immBegin(prim_type, strip_len);
-        }
-      }
-      else {
-        iter++;
-      }
+  BLI_spin_lock(sound->spinlock);
+  if (!sound->waveform) {
+    /* Load the waveform data if it hasn't been loaded and cached already. */
+    if (!(sound->tags & SOUND_TAGS_WAVEFORM_LOADING)) {
+      /* Prevent sounds from reloading. */
+      sound->tags |= SOUND_TAGS_WAVEFORM_LOADING;
+      BLI_spin_unlock(sound->spinlock);
+      sequencer_preview_add_sound(C, seq);
+    }
+    else {
+      BLI_spin_unlock(sound->spinlock);
     }
-    immEnd();
-    immUnbindProgram();
-
-    GPU_blend(GPU_BLEND_NONE);
   }
+  BLI_spin_unlock(sound->spinlock);
 }
 
-static float clamp_frame_coord_to_pixel(float frame_coord,
-                                        float pixel_frac,
-                                        float frames_per_pixel)
+static size_t get_vertex_count(WaveVizData *waveform_data)
 {
-  float cur_pixel = (frame_coord / frames_per_pixel);
-  float new_pixel = (int)(frame_coord / frames_per_pixel) + pixel_frac;
-  if (cur_pixel > new_pixel) {
-    new_pixel += 1.0f;
+  bool draw_line = waveform_data->draw_line;
+  size_t length = 0;
+
+  while (waveform_data->draw_line == draw_line && !waveform_data->final_sample) {
+    waveform_data++;
+    length++;
   }
-  return new_pixel * frames_per_pixel;
+
+  return length;
 }
 
-/**
- * \param x1, x2, y1, y2: The starting and end X value to draw the wave, same for y1 and y2.
- * \param frames_per_pixel: The amount of pixels a whole frame takes up (x-axis direction).
- */
-static void draw_seq_waveform_overlay(View2D *v2d,
-                                      const bContext *C,
-                                      SpaceSeq *sseq,
-                                      Scene *scene,
-                                      Sequence *seq,
-                                      float x1,
-                                      float y1,
-                                      float x2,
-                                      float y2,
-                                      float frames_per_pixel)
+static size_t draw_waveform_segment(WaveVizData *waveform_data, bool use_rms)
 {
-  if (seq->sound && ((sseq->timeline_overlay.flag & SEQ_TIMELINE_ALL_WAVEFORMS) ||
-                     (seq->flag & SEQ_AUDIO_DRAW_WAVEFORM))) {
-    /* Make sure that the start drawing position is aligned to the pixels on the screen to avoid
-     * flickering when moving around the strip.
-     * To do this we figure out the fractional offset in pixel space by checking where the
-     * window starts.
-     * We then append this pixel offset to our strip start coordinate to ensure we are aligned to
-     * the screen pixel grid. */
-    float pixel_frac = v2d->cur.xmin / frames_per_pixel - floor(v2d->cur.xmin / frames_per_pixel);
-    float x1_adj = clamp_frame_coord_to_pixel(x1, pixel_frac, frames_per_pixel);
-
-    /* Offset x1 and x2 values, to match view min/max, if strip is out of bounds. */
-    float x1_offset = max_ff(v2d->cur.xmin, x1_adj);
-    float x2_offset = min_ff(v2d->cur.xmax, x2);
-
-    /* Calculate how long the strip that is in view is in pixels. */
-    int pix_strip_len = round((x2_offset - x1_offset) / frames_per_pixel);
-
-    if (pix_strip_len < 2) {
-      return;
-    }
+  size_t vertices_done = 0;
+  size_t vertex_count = get_vertex_count(waveform_data);
 
-    bSound *sound = seq->sound;
+  /* Not enough data to draw. */
+  if (vertex_count <= 2) {
+    return vertex_count;
+  }
 
-    BLI_spin_lock(sound->spinlock);
-    if (!sound->waveform) {
-      /* Load the waveform data if it hasn't been loaded and cached already. */
-      if (!(sound->tags & SOUND_TAGS_WAVEFORM_LOADING)) {
-        /* Prevent sounds from reloading. */
-        sound->tags |= SOUND_TAGS_WAVEFORM_LOADING;
-        BLI_spin_unlock(sound->spinlock);
-        sequencer_preview_add_sound(C, seq);
-      }
-      else {
-        BLI_spin_unlock(sound->spinlock);
-      }
-      return; /* Nothing to draw. */
-    }
-    BLI_spin_unlock(sound->spinlock);
+  GPU_blend(GPU_BLEND_ALPHA);
+  GPUVertFormat *format = immVertexFormat();
+  GPUPrimType prim_type = waveform_data->draw_line ? GPU_PRIM_LINE_STRIP : GPU_PRIM_TRI_STRIP;
+  uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+  uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
+  immBegin(prim_type, vertex_count);
 
-    SoundWaveform *waveform = sound->waveform;
+  while (vertices_done < vertex_count && !waveform_data->final_sample) {
+    /* Color. */
+    if (waveform_data->clip) {
+      immAttr4f(col, 1.0f, 0.0f, 0.0f, 0.5f);
+    }
+    else if (use_rms) {
+      immAttr4f(col, 1.0f, 1.0f, 1.0f, 0.8f);
+    }
+    else {
+      immAttr4f(col, 1.0f, 1.0f, 1.0f, 0.5f);
+    }
 
-    /* Waveform could not be built. */
-    if (waveform->length == 0) {
-      return;
+    /* Vertices. */
+    if (use_rms) {
+      immVertex2f(pos, waveform_data->pos[0], waveform_data->rms_pos);
+    }
+    else {
+      immVertex2f(pos, waveform_data->pos[0], waveform_data->pos[1]);
     }
 
-    /* F-Curve lookup is quite expensive, so do this after precondition. */
-    FCurve *fcu = id_data_find_fcurve(&scene->id, seq, &RNA_Sequence, "volume", 0, NULL);
+    vertices_done++;
+    waveform_data++;
+  }
 
-    WaveVizData *tri_strip_arr = MEM_callocN(sizeof(*tri_strip_arr) * pix_strip_len * 2,
-                                             "tri_strip");
-    WaveVizData *line_strip_arr = MEM_callocN(sizeof(*line_strip_arr) * pix_strip_len,
-                                              "line_strip");
+  immEnd();
+  immUnbindProgram();
 
-    WaveVizData *tri_strip_iter = tri_strip_arr;
-    WaveVizData *line_strip_iter = line_strip_arr;
+  GPU_blend(GPU_BLEND_NONE);
 
-    /* The y coordinate for the middle of the strip. */
-    float y_mid = (y1 + y2) / 2.0f;
-    /* The length from the middle of the strip to the top/bottom. */
-    float y_scale = (y2 - y1) / 2.0f;
-    float volume = seq->volume;
+  return vertices_done;
+}
 
-    /* Value to keep track if the previous item to be drawn was a line strip. */
-    int8_t was_line_strip = -1; /* -1 == no previous value. */
+static void draw_waveform(WaveVizData *waveform_data, size_t wave_data_len)
+{
+  size_t items_done = 0;
+  while (items_done < wave_data_len) {
+    if (!waveform_data[items_done].draw_line) { /* Draw RMS. */
+      draw_waveform_segment(&waveform_data[items_done], true);
+    }
+    items_done += draw_waveform_segment(&waveform_data[items_done], false);
+  }
+}
 
-    float samples_per_frame = SOUND_WAVE_SAMPLES_PER_SECOND / FPS;
+static float align_frame_with_pixel(float frame_coord, float frames_per_pixel)
+{
+  return round_fl_to_int(frame_coord / frames_per_pixel) * frames_per_pixel;
+}
 
-    /* How many samples do we have for each pixel? */
-    float samples_per_pix = samples_per_frame * frames_per_pixel;
+static void write_waveform_data(WaveVizData *waveform_data,
+                                const vec2f pos,
+                                const float rms,
+                                const bool is_clipping,
+                                const bool draw_line)
+{
+  waveform_data->pos[0] = pos.x;
+  waveform_data->pos[1] = pos.y;
+  waveform_data->clip = is_clipping;
+  waveform_data->rms_pos = rms;
+  waveform_data->draw_line = draw_line;
+}
 
-    float strip_start_offset = seq->startofs + seq->anim_startofs;
-    float start_sample = 0;
+static size_t waveform_append_sample(WaveVizData *waveform_data,
+                                     vec2f pos,
+                                     const float value_min,
+                                     const float value_max,
+                                     const float y_mid,
+                                     const float y_scale,
+                                     const float rms,
+                                     const bool is_clipping,
+                                     const bool is_line_strip)
+{
+  size_t data_written = 0;
+  pos.y = y_mid + value_min * y_scale;
+  float rms_value = y_mid + max_ff(-rms, value_min) * y_scale;
+  write_waveform_data(&waveform_data[0], pos, rms_value, is_clipping, is_line_strip);
+  data_written++;
+
+  /* Use `value_max` as second vertex for triangle drawing. */
+  if (!is_line_strip) {
+    pos.y = y_mid + value_max * y_scale;
+    rms_value = y_mid + min_ff(rms, value_max) * y_scale;
+    write_waveform_data(&waveform_data[1], pos, rms_value, is_clipping, is_line_strip);
+    data_written++;
+  }
+  return data_written;
+}
 
-    if (strip_start_offset != 0) {
-      /* If start offset is not zero, we need to make sure that we pick the same start sample as if
-       * we simply scrolled the start of the strip off-screen. Otherwise we will get flickering
-       * when changing start offset as the pixel alignment will not be the same for the drawn
-       * samples. */
-      strip_start_offset = clamp_frame_coord_to_pixel(
-          x1 - strip_start_offset, pixel_frac, frames_per_pixel);
-      start_sample = fabsf(strip_start_offset - x1_adj) * samples_per_frame;
-    }
+/**
+ * \param x1, x2, y1, y2: The starting and end X value to draw the wave, same for y1 and y2.
+ * \param frames_per_pixel: The amount of pixels a whole frame takes up (x-axis direction).
+ */
+static void draw_seq_waveform_overlay(
+    const bContext *C, ARegion *region, Sequence *seq, float x1, float y1, float x2, float y2)
+{
+  const View2D *v2d = &region->v2d;
+  Scene *scene = CTX_data_scene(C);
 
-    start_sample += seq->sound->offset_time * SOUND_WAVE_SAMPLES_PER_SECOND;
-    /* If we scrolled the start off-screen, then the start sample should be at the first visible
-     * sample. */
-    start_sample += (x1_offset - x1_adj) * samples_per_frame;
+  const float frames_per_pixel = BLI_rctf_size_x(&region->v2d.cur) / region->winx;
+  const float samples_per_frame = SOUND_WAVE_SAMPLES_PER_SECOND / FPS;
+  float samples_per_pixel = samples_per_frame * frames_per_pixel;
 
-    for (int i = 0; i < pix_strip_len; i++) {
-      float sample_offset = start_sample + i * samples_per_pix;
-      int p = sample_offset;
+  /* Align strip start with nearest pixel to prevent waveform flickering. */
+  const float x1_aligned = align_frame_with_pixel(x1, frames_per_pixel);
+  /* Offset x1 and x2 values, to match view min/max, if strip is out of bounds. */
+  const float frame_start = max_ff(v2d->cur.xmin, x1_aligned);
+  const float frame_end = min_ff(v2d->cur.xmax, x2);
+  const int pixels_to_draw = round_fl_to_int((frame_end - frame_start) / frames_per_pixel);
 
-      if (p < 0) {
-        continue;
-      }
+  if (pixels_to_draw < 2) {
+    return; /* Not much to draw, exit before running job. */
+  }
 
-      if (p >= waveform->length) {
-        break;
-      }
+  waveform_job_start_if_needed(C, seq);
 
-      float value_min = waveform->data[p * 3];
-      float value_max = waveform->data[p * 3 + 1];
-      float rms = waveform->data[p * 3 + 2];
-
-      if (p + 1 < waveform->length) {
-        /* Use simple linear interpolation. */
-        float f = sample_offset - p;
-        value_min = (1.0f - f) * value_min + f * waveform->data[p * 3 + 3];
-        value_max = (1.0f - f) * value_max + f * waveform->data[p * 3 + 4];
-        rms = (1.0f - f) * rms + f * waveform->data[p * 3 + 5];
-        if (samples_per_pix > 1.0f) {
-          /* We need to sum up the values we skip over until the next step. */
-          float next_pos = sample_offset + samples_per_pix;
-          int end_idx = next_pos;
-
-          for (int j = p + 1; (j < waveform->length) && (j < end_idx); j++) {
-            value_min = min_ff(value_min, waveform->data[j * 3]);
-            value_max = max_ff(value_max, waveform->data[j * 3 + 1]);
-            rms = max_ff(rms, waveform->data[j * 3 + 2]);
-          }
-        }
-      }
+  SoundWaveform *waveform = seq->sound->waveform;
+  if (waveform == NULL || waveform->length == 0) {
+    return; /* Waveform was not built. */
+  }
 
-      if (fcu && !BKE_fcurve_is_empty(fcu)) {
-        float evaltime = x1_offset + (i * frames_per_pixel);
-        volume = evaluate_fcurve(fcu, evaltime);
-        CLAMP_MIN(volume, 0.0f);
-      }
+  /* F-Curve lookup is quite expensive, so do this after precondition. */
+  FCurve *fcu = id_data_find_fcurve(&scene->id, seq, &RNA_Sequence, "volume", 0, NULL);
+  WaveVizData *waveform_data = MEM_callocN(sizeof(WaveVizData) * pixels_to_draw * 3, __func__);
+  size_t wave_data_len = 0;
 
-      value_min *= volume;
-      value_max *= volume;
-      rms *= volume;
+  /* Offset must be also aligned, otherwise waveform flickers when moving left handle. */
+  const float strip_offset = align_frame_with_pixel(seq->startofs + seq->anim_startofs,
+                                                    frames_per_pixel);
+  float start_sample = strip_offset * samples_per_frame;
+  start_sample += seq->sound->offset_time * SOUND_WAVE_SAMPLES_PER_SECOND;
+  /* Add off-screen part of strip to offset. */
+  start_sample += (frame_start - x1_aligned) * samples_per_frame;
 
-      bool clipping = false;
+  for (int i = 0; i < pixels_to_draw; i++) {
+    float sample = start_sample + i * samples_per_pixel;
+    int sample_index = round_fl_to_int(sample);
 
-      if (value_max > 1 || value_min < -1) {
-        clipping = true;
+    if (sample_index < 0) {
+      continue;
+    }
 
-        CLAMP_MAX(value_max, 1.0f);
-        CLAMP_MIN(value_min, -1.0f);
-      }
+    if (sample_index >= waveform->length) {
+      break;
+    }
 
-      bool is_line_strip = (value_max - value_min < 0.05f);
-
-      if (!ELEM(was_line_strip, -1, is_line_strip)) {
-        /* If the previously added strip type isn't the same as the current one,
-         * add transition areas so they transition smoothly between each other. */
-        if (is_line_strip) {
-          /* This will be a line strip, end the tri strip. */
-          tri_strip_iter->pos[0] = x1_offset + i * frames_per_pixel;
-          tri_strip_iter->pos[1] = y_mid + value_min * y_scale;
-          tri_strip_iter->clip = clipping;
-          tri_strip_iter->rms_pos = tri_strip_iter->pos[1];
-          tri_strip_iter->end = true;
-
-          /* End of section. */
-          tri_strip_iter++;
-
-          /* Check if we are at the end.
-           * If so, skip one point line. */
-          if (i + 1 == pix_strip_len) {
-            continue;
-          }
-        }
-        else {
-          /* This will be a tri strip. */
-          line_strip_iter--;
-          tri_strip_iter->pos[0] = line_strip_iter->pos[0];
-          tri_strip_iter->pos[1] = line_strip_iter->pos[1];
-          tri_strip_iter->clip = line_strip_iter->clip;
-          tri_strip_iter->rms_pos = line_strip_iter->pos[1];
-          tri_strip_iter++;
-
-          /* Check if line had only one point. */
-          line_strip_iter--;
-          if (line_strip_iter < line_strip_arr || line_strip_iter->end) {
-            /* Only one point, skip it. */
-            line_strip_iter++;
-          }
-          else {
-            /* End of section. */
-            line_strip_iter++;
-            line_strip_iter->end = true;
-            line_strip_iter++;
-          }
+    float value_min = waveform->data[sample_index * 3];
+    float value_max = waveform->data[sample_index * 3 + 1];
+    float rms = waveform->data[sample_index * 3 + 2];
+
+    if (sample_index + 1 < waveform->length) {
+      /* Use simple linear interpolation. */
+      float f = sample - sample_index;
+      value_min = (1.0f - f) * value_min + f * waveform->data[sample_index * 3 + 3];
+      value_max = (1.0f - f) * value_max + f * waveform->data[sample_index * 3 + 4];
+      rms = (1.0f - f) * rms + f * waveform->data[sample_index * 3 + 5];
+      if (samples_per_pixel > 1.0f) {
+        /* We need to sum up the values we skip over until the next step. */
+        float next_pos = sample + samples_per_pixel;
+        int end_idx = next_pos;
+
+        for (int j = sample_index + 1; (j < waveform->length) && (j < end_idx); j++) {
+          value_min = min_ff(value_min, waveform->data[j * 3]);
+          value_max = max_ff(value_max, waveform->data[j * 3 + 1]);
+          rms = max_ff(rms, waveform->data[j * 3 + 2]);
         }
       }
+    }
 
-      was_line_strip = is_line_strip;
-
-      if (is_line_strip) {
-        line_strip_iter->pos[0] = x1_offset + i * frames_per_pixel;
-        line_strip_iter->pos[1] = y_mid + value_min * y_scale;
-        line_strip_iter->clip = clipping;
-        line_strip_iter++;
-      }
-      else {
-        tri_strip_iter->pos[0] = x1_offset + i * frames_per_pixel;
-        tri_strip_iter->pos[1] = y_mid + value_min * y_scale;
-        tri_strip_iter->clip = clipping;
-        tri_strip_iter->rms_pos = y_mid + max_ff(-rms, value_min) * y_scale;
-        tri_strip_iter++;
-
-        tri_strip_iter->pos[0] = x1_offset + i * frames_per_pixel;
-        tri_strip_iter->pos[1] = y_mid + value_max * y_scale;
-        tri_strip_iter->clip = clipping;
-        tri_strip_iter->rms_pos = y_mid + min_ff(rms, value_max) * y_scale;
-        tri_strip_iter++;
-      }
+    float volume = seq->volume;
+    if (fcu && !BKE_fcurve_is_empty(fcu)) {
+      float evaltime = frame_start + (i * frames_per_pixel);
+      volume = evaluate_fcurve(fcu, evaltime);
+      CLAMP_MIN(volume, 0.0f);
     }
 
-    WaveVizData *tri_strip_end = tri_strip_iter;
-    WaveVizData *line_strip_end = line_strip_iter;
+    value_min *= volume;
+    value_max *= volume;
+    rms *= volume;
+
+    bool is_clipping = false;
 
-    tri_strip_iter = tri_strip_arr;
-    line_strip_iter = line_strip_arr;
+    if (value_max > 1 || value_min < -1) {
+      is_clipping = true;
 
-    draw_waveform(line_strip_iter, line_strip_end, GPU_PRIM_LINE_STRIP, false);
-    draw_waveform(tri_strip_iter, tri_strip_end, GPU_PRIM_TRI_STRIP, false);
-    draw_waveform(tri_strip_iter, tri_strip_end, GPU_PRIM_TRI_STRIP, true);
+      CLAMP_MAX(value_max, 1.0f);
+      CLAMP_MIN(value_min, -1.0f);
+    }
 
-    MEM_freeN(tri_strip_arr);
-    MEM_freeN(line_strip_arr);
+    bool is_line_strip = (value_max - value_min < 0.05f);
+    /* The y coordinate for the middle of the strip. */
+    float y_mid = (y1 + y2) / 2.0f;
+    /* The length from the middle of the strip to the top/bottom. */
+    float y_scale = (y2 - y1) / 2.0f;
+
+    vec2f pos = {frame_start + i * frames_per_pixel, y_mid + value_min * y_scale};
+    WaveVizData *new_data = &waveform_data[wave_data_len];
+    wave_data_len += waveform_append_sample(
+        new_data, pos, value_min, value_max, y_mid, y_scale, rms, is_clipping, is_line_strip);
   }
+
+  /* Terminate array, so `get_segment_length()` can know when to stop. */
+  waveform_data[wave_data_len].final_sample = true;
+  draw_waveform(waveform_data, wave_data_len);
+  MEM_freeN(waveform_data);
 }
 
 static void drawmeta_contents(Scene *scene,
@@ -613,7 +568,7 @@ static void drawmeta_contents(Scene *scene,
   col[3] = 196; /* Alpha, used for all meta children. */
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw only immediate children (1 level depth). */
   for (seq = meta_seqbase->first; seq; seq = seq->next) {
@@ -1203,7 +1158,7 @@ static void draw_seq_invalid(float x1, float x2, float y2, float text_margin_y)
   GPU_blend(GPU_BLEND_ALPHA);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformColor4f(1.0f, 0.0f, 0.0f, 0.9f);
   immRectf(pos, x1, y2, x2, text_margin_y);
 
@@ -1321,7 +1276,7 @@ static void draw_seq_fcurve_overlay(
 
     GPUBatch *batch = GPU_batch_create_ex(GPU_PRIM_TRI_STRIP, vbo, NULL, GPU_BATCH_OWNS_VBO);
     GPU_vertbuf_data_len_set(vbo, vert_count);
-    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_UNIFORM_COLOR);
+    GPU_batch_program_set_builtin(batch, GPU_SHADER_3D_UNIFORM_COLOR);
     GPU_batch_uniform_4f(batch, "color", 0.0f, 0.0f, 0.0f, 0.15f);
     GPU_blend(GPU_BLEND_ALPHA);
 
@@ -1389,7 +1344,7 @@ static void draw_seq_strip(const bContext *C,
   }
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   draw_seq_background(scene, seq, pos, x1, x2, y1, y2, is_single_image, show_strip_color_tag);
 
@@ -1430,18 +1385,9 @@ static void draw_seq_strip(const bContext *C,
   }
 
   /* Draw sound strip waveform. */
-  if ((seq->type == SEQ_TYPE_SOUND_RAM) && ((sseq->flag & SEQ_SHOW_OVERLAY)) &&
-      (sseq->timeline_overlay.flag & SEQ_TIMELINE_NO_WAVEFORMS) == 0) {
-    draw_seq_waveform_overlay(v2d,
-                              C,
-                              sseq,
-                              scene,
-                              seq,
-                              x1,
-                              y_threshold ? y1 + 0.05f : y1,
-                              x2,
-                              y_threshold ? text_margin_y : y2,
-                              BLI_rctf_size_x(&region->v2d.cur) / region->winx);
+  if (seq_draw_waveforms_poll(C, sseq, seq)) {
+    draw_seq_waveform_overlay(
+        C, region, seq, x1, y_threshold ? y1 + 0.05f : y1, x2, y_threshold ? text_margin_y : y2);
   }
   /* Draw locked state. */
   if (SEQ_transform_is_locked(channels, seq)) {
@@ -1454,7 +1400,7 @@ static void draw_seq_strip(const bContext *C,
   }
 
   pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   if (!SEQ_transform_is_locked(channels, seq)) {
     draw_seq_handle(
@@ -1496,7 +1442,7 @@ static void draw_effect_inputs_highlight(const Scene *scene, Sequence *seq)
   GPU_blend(GPU_BLEND_ALPHA);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformColor4ub(255, 255, 255, 48);
   immRectf(pos,
@@ -1703,7 +1649,7 @@ static void sequencer_draw_borders_overlay(const SpaceSeq *sseq,
   const uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -1762,8 +1708,7 @@ void sequencer_draw_maskedit(const bContext *C, Scene *scene, ARegion *region, S
       // ED_mask_get_size(C, &width, &height);
 
       //Scene *scene = CTX_data_scene(C);
-      width = (scene->r.size * scene->r.xsch) / 100;
-      height = (scene->r.size * scene->r.ysch) / 100;
+      BKE_render_resolution(&scene->r, false, &width, &height);
 
       ED_mask_draw_region(mask,
                           region,
@@ -1975,7 +1920,7 @@ static void sequencer_draw_display_buffer(const bContext *C,
   GPU_texture_bind(texture, 0);
 
   if (!glsl_used) {
-    immBindBuiltinProgram(GPU_SHADER_2D_IMAGE_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_IMAGE_COLOR);
     immUniformColor3f(1.0f, 1.0f, 1.0f);
   }
 
@@ -2164,7 +2109,7 @@ static void seq_draw_image_origin_and_outline(const bContext *C, Sequence *seq,
   GPU_line_smooth(true);
   GPU_blend(GPU_BLEND_ALPHA);
   GPU_line_width(2);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   float col[3];
   if (is_active_seq) {
@@ -2302,7 +2247,7 @@ void sequencer_draw_preview(const bContext *C,
 static void draw_seq_timeline_channels(View2D *v2d)
 {
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_blend(GPU_BLEND_ALPHA);
   immUniformThemeColor(TH_ROW_ALTERNATE);
 
@@ -2380,7 +2325,7 @@ static void draw_seq_strips(const bContext *C, Editing *ed, ARegion *region)
         GPU_blend(GPU_BLEND_ALPHA);
         uint pos = GPU_vertformat_attr_add(
             immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-        immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
         immUniformColor4ub(255, 255, 255, 48);
         immRectf(pos, v2d->cur.xmin, channel, v2d->cur.xmax, channel + 1);
@@ -2397,7 +2342,7 @@ static void draw_seq_strips(const bContext *C, Editing *ed, ARegion *region)
     GPU_blend(GPU_BLEND_ALPHA);
 
     uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     immUniformColor4ub(255, 255, 255, 48);
     immRectf(pos,
@@ -2421,7 +2366,7 @@ static void seq_draw_sfra_efra(const Scene *scene, View2D *v2d)
   GPU_blend(GPU_BLEND_ALPHA);
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw overlay outside of frame range. */
   immUniformThemeColorShadeAlpha(TH_BACK, -10, -100);
@@ -2463,7 +2408,7 @@ static void seq_draw_sfra_efra(const Scene *scene, View2D *v2d)
 
     immUnbindProgram();
 
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColorShade(TH_BACK, -40);
 
     immBegin(GPU_PRIM_LINES, 4);
@@ -2587,7 +2532,7 @@ static void draw_cache_view_batch(
   GPUBatch *batch = GPU_batch_create_ex(GPU_PRIM_TRIS, vbo, NULL, GPU_BATCH_OWNS_VBO);
   if (vert_count > 0) {
     GPU_vertbuf_data_len_set(vbo, vert_count);
-    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_UNIFORM_COLOR);
+    GPU_batch_program_set_builtin(batch, GPU_SHADER_3D_UNIFORM_COLOR);
     GPU_batch_uniform_4f(batch, "color", col_r, col_g, col_b, col_a);
     GPU_batch_draw(batch);
   }
@@ -2606,7 +2551,7 @@ static void draw_cache_view(const bContext *C)
 
   GPU_blend(GPU_BLEND_ALPHA);
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   float stripe_bot, stripe_top;
   float stripe_ofs_y = UI_view2d_region_to_view_y(v2d, 1.0f) - v2d->cur.ymin;
@@ -2715,7 +2660,7 @@ static void draw_overlap_frame_indicator(const struct Scene *scene, const View2D
                           scene->r.cfra + scene->ed->overlay_frame_ofs;
 
   uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
   immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);
diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index cb95e9a75de..415bb5898a9 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -54,6 +54,7 @@
 #include "RNA_prototypes.h"
 
 /* For menu, popup, icons, etc. */
+#include "ED_fileselect.h"
 #include "ED_keyframing.h"
 #include "ED_numinput.h"
 #include "ED_outliner.h"
@@ -1931,7 +1932,7 @@ static int sequencer_meta_toggle_exec(bContext *C, wmOperator *UNUSED(op))
     SEQ_select_active_set(scene, meta_parent);
   }
 
-  // DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
+  DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
   return OPERATOR_FINISHED;
@@ -2637,12 +2638,12 @@ static int sequencer_swap_data_exec(bContext *C, wmOperator *op)
   Sequence *seq_other;
   const char *error_msg;
 
-  if (SEQ_select_active_get_pair(scene, &seq_act, &seq_other) == 0) {
+  if (SEQ_select_active_get_pair(scene, &seq_act, &seq_other) == false) {
     BKE_report(op->reports, RPT_ERROR, "Please select two strips");
     return OPERATOR_CANCELLED;
   }
 
-  if (SEQ_edit_sequence_swap(scene, seq_act, seq_other, &error_msg) == 0) {
+  if (SEQ_edit_sequence_swap(scene, seq_act, seq_other, &error_msg) == false) {
     BKE_report(op->reports, RPT_ERROR, error_msg);
     return OPERATOR_CANCELLED;
   }
@@ -2869,7 +2870,7 @@ static int sequencer_change_path_exec(bContext *C, wmOperator *op)
 
     RNA_string_get(op->ptr, "directory", directory);
     if (is_relative_path) {
-      /* TODO(campbell): shouldn't this already be relative from the filesel?
+      /* TODO(@campbellbarton): shouldn't this already be relative from the filesel?
        * (as the 'filepath' is) for now just make relative here,
        * but look into changing after 2.60. */
       BLI_path_rel(directory, BKE_main_blendfile_path(bmain));
@@ -3076,7 +3077,7 @@ static int seq_cmp_time_startdisp_channel(void *thunk, const void *a, const void
   int seq_a_start = SEQ_time_left_handle_frame_get(scene, seq_a);
   int seq_b_start = SEQ_time_left_handle_frame_get(scene, seq_b);
 
-  /* If strips have the same start frame favor the one with a higher channel.*/
+  /* If strips have the same start frame favor the one with a higher channel. */
   if (seq_a_start == seq_b_start) {
     return seq_a->machine > seq_b->machine;
   }
@@ -3088,20 +3089,7 @@ static int sequencer_export_subtitles_invoke(bContext *C,
                                              wmOperator *op,
                                              const wmEvent *UNUSED(event))
 {
-  Main *bmain = CTX_data_main(C);
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
-    char filepath[FILE_MAX];
-
-    if (BKE_main_blendfile_path(bmain)[0] == '\0') {
-      BLI_strncpy(filepath, "untitled", sizeof(filepath));
-    }
-    else {
-      BLI_strncpy(filepath, BKE_main_blendfile_path(bmain), sizeof(filepath));
-    }
-
-    BLI_path_extension_replace(filepath, sizeof(filepath), ".srt");
-    RNA_string_set(op->ptr, "filepath", filepath);
-  }
+  ED_fileselect_ensure_default_filepath(C, op, ".srt");
 
   WM_event_add_fileselect(C, op);
 
@@ -3136,7 +3124,7 @@ static int sequencer_export_subtitles_exec(bContext *C, wmOperator *op)
   FILE *file;
   char filepath[FILE_MAX];
 
-  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
+  if (!RNA_struct_property_is_set_ex(op->ptr, "filepath", false)) {
     BKE_report(op->reports, RPT_ERROR, "No filename given");
     return OPERATOR_CANCELLED;
   }
diff --git a/source/blender/editors/space_sequencer/sequencer_scopes.c b/source/blender/editors/space_sequencer/sequencer_scopes.c
index 6ba1dcc5eb8..af0aa093e40 100644
--- a/source/blender/editors/space_sequencer/sequencer_scopes.c
+++ b/source/blender/editors/space_sequencer/sequencer_scopes.c
@@ -17,7 +17,7 @@
 
 #include "sequencer_intern.h"
 
-/* XXX(campbell): why is this function better than BLI_math version?
+/* XXX(@campbellbarton): why is this function better than BLI_math version?
  * only difference is it does some normalize after, need to double check on this. */
 static void rgb_to_yuv_normalized(const float rgb[3], float yuv[3])
 {
diff --git a/source/blender/editors/space_sequencer/sequencer_view.c b/source/blender/editors/space_sequencer/sequencer_view.c
index 4d32c00109a..78fa8c379d9 100644
--- a/source/blender/editors/space_sequencer/sequencer_view.c
+++ b/source/blender/editors/space_sequencer/sequencer_view.c
@@ -12,6 +12,7 @@
 #include "DNA_scene_types.h"
 
 #include "BKE_context.h"
+#include "BKE_scene.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -174,8 +175,7 @@ static int sequencer_view_all_preview_exec(bContext *C, wmOperator *UNUSED(op))
 
   seq_reset_imageofs(sseq);
 
-  imgwidth = (scene->r.size * scene->r.xsch) / 100;
-  imgheight = (scene->r.size * scene->r.ysch) / 100;
+  BKE_render_resolution(&scene->r, false, &imgwidth, &imgheight);
 
   /* Apply aspect, doesn't need to be that accurate. */
   imgwidth = (int)(imgwidth * (scene->r.xasp / scene->r.yasp));
@@ -227,11 +227,11 @@ static int sequencer_view_zoom_ratio_exec(bContext *C, wmOperator *op)
 
   float ratio = RNA_float_get(op->ptr, "ratio");
 
-  float winx = (int)(rd->size * rd->xsch) / 100;
-  float winy = (int)(rd->size * rd->ysch) / 100;
+  int winx, winy;
+  BKE_render_resolution(rd, false, &winx, &winy);
 
-  float facx = BLI_rcti_size_x(&v2d->mask) / winx;
-  float facy = BLI_rcti_size_y(&v2d->mask) / winy;
+  float facx = BLI_rcti_size_x(&v2d->mask) / (float)winx;
+  float facy = BLI_rcti_size_y(&v2d->mask) / (float)winy;
 
   BLI_rctf_resize(&v2d->cur, ceilf(winx * facx / ratio + 0.5f), ceilf(winy * facy / ratio + 0.5f));
 
diff --git a/source/blender/editors/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index 0199fa81928..508f18ade5a 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -229,7 +229,7 @@ static void sequencer_free(SpaceLink *sl)
   }
 }
 
-/* Spacetype init callback. */
+/* Space-type init callback. */
 static void sequencer_init(struct wmWindowManager *UNUSED(wm), ScrArea *UNUSED(area))
 {
 }
@@ -374,7 +374,7 @@ static SpaceLink *sequencer_duplicate(SpaceLink *sl)
 static void sequencer_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* Context changes. */
   switch (wmn->category) {
@@ -630,7 +630,7 @@ static void sequencer_main_region_view2d_changed(const bContext *C, ARegion *reg
 static void sequencer_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* Context changes. */
   switch (wmn->category) {
@@ -862,7 +862,7 @@ static void sequencer_preview_region_draw(const bContext *C, ARegion *region)
 static void sequencer_preview_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   WM_gizmomap_tag_refresh(region->gizmo_map);
 
@@ -933,7 +933,7 @@ static void sequencer_buttons_region_draw(const bContext *C, ARegion *region)
 static void sequencer_buttons_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* Context changes. */
   switch (wmn->category) {
@@ -997,7 +997,7 @@ void ED_spacetype_sequencer(void)
   ARegionType *art;
 
   st->spaceid = SPACE_SEQ;
-  strncpy(st->name, "Sequencer", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Sequencer");
 
   st->create = sequencer_create;
   st->free = sequencer_free;
diff --git a/source/blender/editors/space_spreadsheet/CMakeLists.txt b/source/blender/editors/space_spreadsheet/CMakeLists.txt
index f134cdb95c2..173d976c124 100644
--- a/source/blender/editors/space_spreadsheet/CMakeLists.txt
+++ b/source/blender/editors/space_spreadsheet/CMakeLists.txt
@@ -14,7 +14,6 @@ set(INC
   ../../makesrna
   ../../nodes
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_spreadsheet/space_spreadsheet.cc b/source/blender/editors/space_spreadsheet/space_spreadsheet.cc
index 8dbb4a2ee0c..435436611c5 100644
--- a/source/blender/editors/space_spreadsheet/space_spreadsheet.cc
+++ b/source/blender/editors/space_spreadsheet/space_spreadsheet.cc
@@ -436,7 +436,7 @@ static void spreadsheet_main_region_draw(const bContext *C, ARegion *region)
 static void spreadsheet_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   switch (wmn->category) {
     case NC_SCENE: {
@@ -486,7 +486,7 @@ static void spreadsheet_header_region_free(ARegion *UNUSED(region))
 static void spreadsheet_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   switch (wmn->category) {
     case NC_SCENE: {
@@ -570,7 +570,7 @@ static void spreadsheet_footer_region_listener(const wmRegionListenerParams *UNU
 static void spreadsheet_dataset_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   switch (wmn->category) {
     case NC_SCENE: {
@@ -619,7 +619,7 @@ void ED_spacetype_spreadsheet()
   ARegionType *art;
 
   st->spaceid = SPACE_SPREADSHEET;
-  strncpy(st->name, "Spreadsheet", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Spreadsheet");
 
   st->create = spreadsheet_create;
   st->free = spreadsheet_free;
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.cc b/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.cc
index 2a87c51da5d..fd2ac4d39a1 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.cc
@@ -4,7 +4,9 @@
 #include "BLI_virtual_array.hh"
 
 #include "BKE_attribute.hh"
+#include "BKE_compute_contexts.hh"
 #include "BKE_context.h"
+#include "BKE_curves.hh"
 #include "BKE_editmesh.h"
 #include "BKE_geometry_fields.hh"
 #include "BKE_global.h"
@@ -22,9 +24,11 @@
 
 #include "DEG_depsgraph_query.h"
 
+#include "ED_curves_sculpt.h"
 #include "ED_spreadsheet.h"
 
-#include "NOD_geometry_nodes_eval_log.hh"
+#include "NOD_geometry_nodes_lazy_function.hh"
+#include "NOD_geometry_nodes_log.hh"
 
 #include "BLT_translation.h"
 
@@ -38,8 +42,8 @@
 #include "spreadsheet_data_source_geometry.hh"
 #include "spreadsheet_intern.hh"
 
-namespace geo_log = blender::nodes::geometry_nodes_eval_log;
 using blender::fn::GField;
+using blender::nodes::geo_eval_log::ViewerNodeLog;
 
 namespace blender::ed::spreadsheet {
 
@@ -166,45 +170,49 @@ std::unique_ptr<ColumnValues> GeometryDataSource::get_column_values(
   else if (G.debug_value == 4001 && component_->type() == GEO_COMPONENT_TYPE_MESH) {
     const MeshComponent &component = static_cast<const MeshComponent &>(*component_);
     if (const Mesh *mesh = component.get_for_read()) {
+      const Span<MEdge> edges = mesh->edges();
+      const Span<MPoly> polys = mesh->polys();
+      const Span<MLoop> loops = mesh->loops();
+
       if (domain_ == ATTR_DOMAIN_EDGE) {
         if (STREQ(column_id.name, "Vertex 1")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totedge, [mesh](int64_t index) {
-                return mesh->medge[index].v1;
+              column_id.name, VArray<int>::ForFunc(edges.size(), [edges](int64_t index) {
+                return edges[index].v1;
               }));
         }
         if (STREQ(column_id.name, "Vertex 2")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totedge, [mesh](int64_t index) {
-                return mesh->medge[index].v2;
+              column_id.name, VArray<int>::ForFunc(edges.size(), [edges](int64_t index) {
+                return edges[index].v2;
               }));
         }
       }
       else if (domain_ == ATTR_DOMAIN_FACE) {
         if (STREQ(column_id.name, "Corner Start")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totpoly, [mesh](int64_t index) {
-                return mesh->mpoly[index].loopstart;
+              column_id.name, VArray<int>::ForFunc(polys.size(), [polys](int64_t index) {
+                return polys[index].loopstart;
               }));
         }
         if (STREQ(column_id.name, "Corner Size")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totpoly, [mesh](int64_t index) {
-                return mesh->mpoly[index].totloop;
+              column_id.name, VArray<int>::ForFunc(polys.size(), [polys](int64_t index) {
+                return polys[index].totloop;
               }));
         }
       }
       else if (domain_ == ATTR_DOMAIN_CORNER) {
         if (STREQ(column_id.name, "Vertex")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totloop, [mesh](int64_t index) {
-                return mesh->mloop[index].v;
+              column_id.name, VArray<int>::ForFunc(loops.size(), [loops](int64_t index) {
+                return loops[index].v;
               }));
         }
         if (STREQ(column_id.name, "Edge")) {
           return std::make_unique<ColumnValues>(
-              column_id.name, VArray<int>::ForFunc(mesh->totloop, [mesh](int64_t index) {
-                return mesh->mloop[index].e;
+              column_id.name, VArray<int>::ForFunc(loops.size(), [loops](int64_t index) {
+                return loops[index].e;
               }));
         }
       }
@@ -232,74 +240,108 @@ int GeometryDataSource::tot_rows() const
   return attributes.domain_size(domain_);
 }
 
-/**
- * Only data sets corresponding to mesh objects in edit mode currently support selection filtering.
- */
 bool GeometryDataSource::has_selection_filter() const
 {
   Object *object_orig = DEG_get_original_object(object_eval_);
-  if (object_orig->type != OB_MESH) {
-    return false;
-  }
-  if (object_orig->mode != OB_MODE_EDIT) {
-    return false;
-  }
-  if (component_->type() != GEO_COMPONENT_TYPE_MESH) {
-    return false;
+  switch (component_->type()) {
+    case GEO_COMPONENT_TYPE_MESH: {
+      if (object_orig->type != OB_MESH) {
+        return false;
+      }
+      if (object_orig->mode != OB_MODE_EDIT) {
+        return false;
+      }
+      return true;
+    }
+    case GEO_COMPONENT_TYPE_CURVE: {
+      if (object_orig->type != OB_CURVES) {
+        return false;
+      }
+      if (object_orig->mode != OB_MODE_SCULPT_CURVES) {
+        return false;
+      }
+      return true;
+    }
+    default:
+      return false;
   }
-
-  return true;
 }
 
 IndexMask GeometryDataSource::apply_selection_filter(Vector<int64_t> &indices) const
 {
   std::lock_guard lock{mutex_};
   const IndexMask full_range(this->tot_rows());
+  if (full_range.is_empty()) {
+    return full_range;
+  }
+
+  switch (component_->type()) {
+    case GEO_COMPONENT_TYPE_MESH: {
+      BLI_assert(object_eval_->type == OB_MESH);
+      BLI_assert(object_eval_->mode == OB_MODE_EDIT);
+      Object *object_orig = DEG_get_original_object(object_eval_);
+      const Mesh *mesh_eval = geometry_set_.get_mesh_for_read();
+      const bke::AttributeAccessor attributes_eval = mesh_eval->attributes();
+      Mesh *mesh_orig = (Mesh *)object_orig->data;
+      BMesh *bm = mesh_orig->edit_mesh->bm;
+      BM_mesh_elem_table_ensure(bm, BM_VERT);
+
+      const int *orig_indices = (int *)CustomData_get_layer(&mesh_eval->vdata, CD_ORIGINDEX);
+      if (orig_indices != nullptr) {
+        /* Use CD_ORIGINDEX layer if it exists. */
+        VArray<bool> selection = attributes_eval.adapt_domain<bool>(
+            VArray<bool>::ForFunc(mesh_eval->totvert,
+                                  [bm, orig_indices](int vertex_index) -> bool {
+                                    const int i_orig = orig_indices[vertex_index];
+                                    if (i_orig < 0) {
+                                      return false;
+                                    }
+                                    if (i_orig >= bm->totvert) {
+                                      return false;
+                                    }
+                                    const BMVert *vert = BM_vert_at_index(bm, i_orig);
+                                    return BM_elem_flag_test(vert, BM_ELEM_SELECT);
+                                  }),
+            ATTR_DOMAIN_POINT,
+            domain_);
+        return index_mask_ops::find_indices_from_virtual_array(
+            full_range, selection, 1024, indices);
+      }
 
-  BLI_assert(object_eval_->mode == OB_MODE_EDIT);
-  BLI_assert(component_->type() == GEO_COMPONENT_TYPE_MESH);
-  Object *object_orig = DEG_get_original_object(object_eval_);
-  const MeshComponent *mesh_component = static_cast<const MeshComponent *>(component_);
-  const Mesh *mesh_eval = mesh_component->get_for_read();
-  Mesh *mesh_orig = (Mesh *)object_orig->data;
-  BMesh *bm = mesh_orig->edit_mesh->bm;
-  BM_mesh_elem_table_ensure(bm, BM_VERT);
-
-  const int *orig_indices = (int *)CustomData_get_layer(&mesh_eval->vdata, CD_ORIGINDEX);
-  if (orig_indices != nullptr) {
-    /* Use CD_ORIGINDEX layer if it exists. */
-    VArray<bool> selection = mesh_component->attributes()->adapt_domain<bool>(
-        VArray<bool>::ForFunc(mesh_eval->totvert,
-                              [bm, orig_indices](int vertex_index) -> bool {
-                                const int i_orig = orig_indices[vertex_index];
-                                if (i_orig < 0) {
-                                  return false;
-                                }
-                                if (i_orig >= bm->totvert) {
-                                  return false;
-                                }
-                                BMVert *vert = bm->vtable[i_orig];
-                                return BM_elem_flag_test(vert, BM_ELEM_SELECT);
-                              }),
-        ATTR_DOMAIN_POINT,
-        domain_);
-    return index_mask_ops::find_indices_from_virtual_array(full_range, selection, 1024, indices);
-  }
-
-  if (mesh_eval->totvert == bm->totvert) {
-    /* Use a simple heuristic to match original vertices to evaluated ones. */
-    VArray<bool> selection = mesh_component->attributes()->adapt_domain<bool>(
-        VArray<bool>::ForFunc(mesh_eval->totvert,
-                              [bm](int vertex_index) -> bool {
-                                BMVert *vert = bm->vtable[vertex_index];
-                                return BM_elem_flag_test(vert, BM_ELEM_SELECT);
-                              }),
-        ATTR_DOMAIN_POINT,
-        domain_);
-    return index_mask_ops::find_indices_from_virtual_array(full_range, selection, 2048, indices);
-  }
-
-  return full_range;
+      if (mesh_eval->totvert == bm->totvert) {
+        /* Use a simple heuristic to match original vertices to evaluated ones. */
+        VArray<bool> selection = attributes_eval.adapt_domain<bool>(
+            VArray<bool>::ForFunc(mesh_eval->totvert,
+                                  [bm](int vertex_index) -> bool {
+                                    const BMVert *vert = BM_vert_at_index(bm, vertex_index);
+                                    return BM_elem_flag_test(vert, BM_ELEM_SELECT);
+                                  }),
+            ATTR_DOMAIN_POINT,
+            domain_);
+        return index_mask_ops::find_indices_from_virtual_array(
+            full_range, selection, 2048, indices);
+      }
+
+      return full_range;
+    }
+    case GEO_COMPONENT_TYPE_CURVE: {
+      BLI_assert(object_eval_->type == OB_CURVES);
+      BLI_assert(object_eval_->mode == OB_MODE_SCULPT_CURVES);
+      const CurveComponent &component = static_cast<const CurveComponent &>(*component_);
+      const Curves &curves_id = *component.get_for_read();
+      switch (domain_) {
+        case ATTR_DOMAIN_POINT:
+          return sculpt_paint::retrieve_selected_points(curves_id, indices);
+        case ATTR_DOMAIN_CURVE:
+          return sculpt_paint::retrieve_selected_curves(curves_id, indices);
+        default:
+          BLI_assert_unreachable();
+      }
+      return full_range;
+    }
+    default:
+      return full_range;
+  }
 }
 
 void VolumeDataSource::foreach_default_column_ids(
@@ -412,7 +454,7 @@ GeometrySet spreadsheet_get_display_geometry_set(const SpaceSpreadsheet *sspread
   }
   else {
     if (object_eval->mode == OB_MODE_EDIT && object_eval->type == OB_MESH) {
-      Mesh *mesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(object_eval, false);
+      Mesh *mesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(object_eval);
       if (mesh == nullptr) {
         return geometry_set;
       }
@@ -428,19 +470,10 @@ GeometrySet spreadsheet_get_display_geometry_set(const SpaceSpreadsheet *sspread
         }
       }
       else {
-        const geo_log::NodeLog *node_log =
-            geo_log::ModifierLog::find_node_by_spreadsheet_editor_context(*sspreadsheet);
-        if (node_log != nullptr) {
-          for (const geo_log::SocketLog &input_log : node_log->input_logs()) {
-            if (const geo_log::GeometryValueLog *geo_value_log =
-                    dynamic_cast<const geo_log::GeometryValueLog *>(input_log.value())) {
-              const GeometrySet *full_geometry = geo_value_log->full_geometry();
-              if (full_geometry != nullptr) {
-                geometry_set = *full_geometry;
-                break;
-              }
-            }
-          }
+        if (const ViewerNodeLog *viewer_log =
+                nodes::geo_eval_log::GeoModifierLog::find_viewer_node_log_for_spreadsheet(
+                    *sspreadsheet)) {
+          geometry_set = viewer_log->geometry;
         }
       }
     }
@@ -458,27 +491,11 @@ static void find_fields_to_evaluate(const SpaceSpreadsheet *sspreadsheet,
     /* No viewer is currently referenced by the context path. */
     return;
   }
-  const geo_log::NodeLog *node_log = geo_log::ModifierLog::find_node_by_spreadsheet_editor_context(
-      *sspreadsheet);
-  if (node_log == nullptr) {
-    return;
-  }
-  for (const geo_log::SocketLog &socket_log : node_log->input_logs()) {
-    const geo_log::ValueLog *value_log = socket_log.value();
-    if (value_log == nullptr) {
-      continue;
-    }
-    if (const geo_log::GFieldValueLog *field_value_log =
-            dynamic_cast<const geo_log::GFieldValueLog *>(value_log)) {
-      const GField &field = field_value_log->field();
-      if (field) {
-        r_fields.add("Viewer", std::move(field));
-      }
-    }
-    if (const geo_log::GenericValueLog *generic_value_log =
-            dynamic_cast<const geo_log::GenericValueLog *>(value_log)) {
-      GPointer value = generic_value_log->value();
-      r_fields.add("Viewer", fn::make_constant_field(*value.type(), value.get()));
+  if (const ViewerNodeLog *viewer_log =
+          nodes::geo_eval_log::GeoModifierLog::find_viewer_node_log_for_spreadsheet(
+              *sspreadsheet)) {
+    if (viewer_log->field) {
+      r_fields.add("Viewer", viewer_log->field);
     }
   }
 }
@@ -526,7 +543,7 @@ static void add_fields_as_extra_columns(SpaceSpreadsheet *sspreadsheet,
           std::make_unique<GeometryComponentCacheKey>(component));
 
   const eAttrDomain domain = (eAttrDomain)sspreadsheet->attribute_domain;
-  const int domain_num = component.attributes()->domain_size(domain);
+  const int domain_num = component.attribute_domain_size(domain);
   for (const auto item : fields_to_show.items()) {
     const StringRef name = item.key;
     const GField &field = item.value;
@@ -535,7 +552,7 @@ static void add_fields_as_extra_columns(SpaceSpreadsheet *sspreadsheet,
     GArray<> &evaluated_array = cache.arrays.lookup_or_add_cb({domain, field}, [&]() {
       GArray<> evaluated_array(field.cpp_type(), domain_num);
 
-      bke::GeometryComponentFieldContext field_context{component, domain};
+      bke::GeometryFieldContext field_context{component, domain};
       fn::FieldEvaluator field_evaluator{field_context, domain_num};
       field_evaluator.add_with_destination(field, evaluated_array);
       field_evaluator.evaluate();
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.hh b/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.hh
index 04b4f6d8d06..71bc4768949 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.hh
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_data_source_geometry.hh
@@ -68,10 +68,6 @@ class GeometryDataSource : public DataSource {
     return object_eval_;
   }
 
-  /**
-   * Only data sets corresponding to mesh objects in edit mode currently support selection
-   * filtering.
-   */
   bool has_selection_filter() const override;
   IndexMask apply_selection_filter(Vector<int64_t> &indices) const;
 
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_dataset_draw.cc b/source/blender/editors/space_spreadsheet/spreadsheet_dataset_draw.cc
index aa9b867264a..146b6091bde 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_dataset_draw.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_dataset_draw.cc
@@ -145,7 +145,7 @@ void GeometryDataSetTreeViewItem::build_row(uiLayout &row)
      * to the right side of the number, which it didn't have with the button. */
     char element_count[7];
     BLI_str_format_decimal_unit(element_count, *count);
-    UI_but_hint_drawstr_set((uiBut *)this->tree_row_button(), element_count);
+    UI_but_hint_drawstr_set((uiBut *)this->view_item_button(), element_count);
   }
 }
 
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_draw.cc b/source/blender/editors/space_spreadsheet/spreadsheet_draw.cc
index c7170cd1da3..e1f13f05715 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_draw.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_draw.cc
@@ -273,7 +273,7 @@ void draw_spreadsheet_in_region(const bContext *C,
 
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   draw_index_column_background(pos, region, drawer);
   draw_alternating_row_overlay(pos, scroll_offset_y, region, drawer);
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc b/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
index 780dd0303cd..3fe4c7c8ee0 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_layout.cc
@@ -287,7 +287,7 @@ class SpreadsheetLayoutDrawer : public SpreadsheetDrawer {
     for (const int i : values.index_range()) {
       std::stringstream ss;
       const float value = values[i];
-      ss << std::fixed << std::setprecision(3) << value;
+      ss << " " << std::fixed << std::setprecision(3) << value;
       const std::string value_str = ss.str();
       uiBut *but = uiDefIconTextBut(params.block,
                                     UI_BTYPE_LABEL,
@@ -318,7 +318,7 @@ class SpreadsheetLayoutDrawer : public SpreadsheetDrawer {
     for (const int i : values.index_range()) {
       std::stringstream ss;
       const float value = values[i];
-      ss << std::fixed << std::setprecision(3) << value;
+      ss << " " << std::fixed << std::setprecision(3) << value;
       const std::string value_str = ss.str();
       uiBut *but = uiDefIconTextBut(params.block,
                                     UI_BTYPE_LABEL,
diff --git a/source/blender/editors/space_spreadsheet/spreadsheet_row_filter.cc b/source/blender/editors/space_spreadsheet/spreadsheet_row_filter.cc
index 6806e185cfe..03cf0116dce 100644
--- a/source/blender/editors/space_spreadsheet/spreadsheet_row_filter.cc
+++ b/source/blender/editors/space_spreadsheet/spreadsheet_row_filter.cc
@@ -71,6 +71,14 @@ static void apply_row_filter(const SpreadsheetRowFilter &row_filter,
       }
     }
   }
+  else if (column_data.type().is<bool>()) {
+    const bool value = (row_filter.flag & SPREADSHEET_ROW_FILTER_BOOL_VALUE) != 0;
+    apply_filter_operation(
+        column_data.typed<bool>(),
+        [&](const bool cell) { return cell == value; },
+        prev_mask,
+        new_indices);
+  }
   else if (column_data.type().is<int8_t>()) {
     const int value = row_filter.value_int;
     switch (row_filter.operation) {
@@ -274,7 +282,6 @@ static void apply_row_filter(const SpreadsheetRowFilter &row_filter,
   }
   else if (column_data.type().is<InstanceReference>()) {
     const StringRef value = row_filter.value_string;
-
     apply_filter_operation(
         column_data.typed<InstanceReference>(),
         [&](const InstanceReference cell) {
diff --git a/source/blender/editors/space_statusbar/CMakeLists.txt b/source/blender/editors/space_statusbar/CMakeLists.txt
index fba40c1ec26..cf0ccd4e552 100644
--- a/source/blender/editors/space_statusbar/CMakeLists.txt
+++ b/source/blender/editors/space_statusbar/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_statusbar/space_statusbar.c b/source/blender/editors/space_statusbar/space_statusbar.c
index 273c0375fb0..e99e8f21364 100644
--- a/source/blender/editors/space_statusbar/space_statusbar.c
+++ b/source/blender/editors/space_statusbar/space_statusbar.c
@@ -83,7 +83,7 @@ static void statusbar_keymap(struct wmKeyConfig *UNUSED(keyconf))
 static void statusbar_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -136,7 +136,7 @@ void ED_spacetype_statusbar(void)
   ARegionType *art;
 
   st->spaceid = SPACE_STATUSBAR;
-  strncpy(st->name, "Status Bar", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Status Bar");
 
   st->create = statusbar_create;
   st->free = statusbar_free;
diff --git a/source/blender/editors/space_text/CMakeLists.txt b/source/blender/editors/space_text/CMakeLists.txt
index 6410e971a66..38787a84fce 100644
--- a/source/blender/editors/space_text/CMakeLists.txt
+++ b/source/blender/editors/space_text/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
 )
 
diff --git a/source/blender/editors/space_text/space_text.c b/source/blender/editors/space_text/space_text.c
index ea35a8c0fa7..be9bbdf109e 100644
--- a/source/blender/editors/space_text/space_text.c
+++ b/source/blender/editors/space_text/space_text.c
@@ -30,6 +30,7 @@
 #include "UI_view2d.h"
 
 #include "RNA_access.h"
+#include "RNA_path.h"
 
 #include "text_format.h"
 #include "text_intern.h" /* own include */
@@ -108,7 +109,7 @@ static SpaceLink *text_duplicate(SpaceLink *sl)
 static void text_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   SpaceText *st = area->spacedata.first;
 
   /* context changes */
@@ -325,7 +326,7 @@ static void text_drop_paste(bContext *UNUSED(C), wmDrag *drag, wmDropBox *drop)
   ID *id = WM_drag_get_local_ID(drag, 0);
 
   /* copy drag path to properties */
-  text = RNA_path_full_ID_py(G_MAIN, id);
+  text = RNA_path_full_ID_py(id);
   RNA_string_set(drop->ptr, "text", text);
   MEM_freeN(text);
 }
@@ -402,7 +403,7 @@ void ED_spacetype_text(void)
   ARegionType *art;
 
   st->spaceid = SPACE_TEXT;
-  strncpy(st->name, "Text", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Text");
 
   st->create = text_create;
   st->free = text_free;
diff --git a/source/blender/editors/space_text/text_autocomplete.c b/source/blender/editors/space_text/text_autocomplete.c
index 54735a4d481..461606f63aa 100644
--- a/source/blender/editors/space_text/text_autocomplete.c
+++ b/source/blender/editors/space_text/text_autocomplete.c
@@ -314,7 +314,7 @@ static int doc_scroll = 0;
 
 static int text_autocomplete_modal(bContext *C, wmOperator *op, const wmEvent *event)
 {
-  /* NOTE(campbell): this code could be refactored or rewritten. */
+  /* NOTE(@campbellbarton): this code could be refactored or rewritten. */
   SpaceText *st = CTX_wm_space_text(C);
   ScrArea *area = CTX_wm_area(C);
   ARegion *region = BKE_area_find_region_type(area, RGN_TYPE_WINDOW);
diff --git a/source/blender/editors/space_text/text_draw.c b/source/blender/editors/space_text/text_draw.c
index c93ffccd477..a976bb6c34b 100644
--- a/source/blender/editors/space_text/text_draw.c
+++ b/source/blender/editors/space_text/text_draw.c
@@ -706,7 +706,7 @@ static void text_update_drawcache(SpaceText *st, ARegion *region)
   drawcache->showlinenrs = st->showlinenrs;
   drawcache->tabnumber = st->tabnumber;
 
-  strncpy(drawcache->text_id, txt->id.name, MAX_ID_NAME);
+  STRNCPY(drawcache->text_id, txt->id.name);
 
   /* clear update flag */
   drawcache->update_flag = 0;
@@ -925,12 +925,12 @@ static void calc_text_rcts(SpaceText *st, ARegion *region, rcti *scroll, rcti *b
     hlstart = (lhlstart * pix_available) / ltexth;
     hlend = (lhlend * pix_available) / ltexth;
 
-    /* The scrollbar is non-linear sized. */
+    /* The scroll-bar is non-linear sized. */
     if (pix_bardiff > 0) {
       /* the start of the highlight is in the current viewport */
       if (st->runtime.viewlines && lhlstart >= st->top &&
           lhlstart <= st->top + st->runtime.viewlines) {
-        /* Speed the progression of the start of the highlight through the scrollbar. */
+        /* Speed the progression of the start of the highlight through the scroll-bar. */
         hlstart = (((pix_available - pix_bardiff) * lhlstart) / ltexth) +
                   (pix_bardiff * (lhlstart - st->top) / st->runtime.viewlines);
       }
@@ -951,7 +951,7 @@ static void calc_text_rcts(SpaceText *st, ARegion *region, rcti *scroll, rcti *b
       /* the end of the highlight is in the current viewport */
       if (st->runtime.viewlines && lhlend >= st->top &&
           lhlend <= st->top + st->runtime.viewlines) {
-        /* Speed the progression of the end of the highlight through the scrollbar. */
+        /* Speed the progression of the end of the highlight through the scroll-bar. */
         hlend = (((pix_available - pix_bardiff) * lhlend) / ltexth) +
                 (pix_bardiff * (lhlend - st->top) / st->runtime.viewlines);
       }
@@ -994,10 +994,10 @@ static void draw_textscroll(const SpaceText *st, rcti *scroll, rcti *back)
   float col[4];
   float rad;
 
-  /* background so highlights don't go behind the scrollbar */
+  /* Background so highlights don't go behind the scroll-bar. */
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   immUniformThemeColor(TH_BACK);
   immRecti(pos, back->xmin, back->ymin, back->xmax, back->ymax);
   immUnbindProgram();
@@ -1076,7 +1076,7 @@ static void draw_documentation(const SpaceText *st, ARegion *region)
   /* Draw panel */
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColor(TH_BACK);
   immRecti(pos, x, y, x + boxw, y - boxh);
@@ -1206,7 +1206,7 @@ static void draw_suggestion_list(const SpaceText *st, const TextDrawContext *tdc
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColor(TH_SHADE1);
   immRecti(pos, x - 1, y + 1, x + boxw + 1, y - boxh - 1);
@@ -1232,7 +1232,7 @@ static void draw_suggestion_list(const SpaceText *st, const TextDrawContext *tdc
     if (item == sel) {
       uint posi = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
       immUniformThemeColor(TH_SHADE2);
       immRecti(posi, x + margin_x, y - 3, x + margin_x + w, y + lheight - 3);
@@ -1280,7 +1280,7 @@ static void draw_text_decoration(SpaceText *st, ARegion *region)
 
   uint pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   /* Draw the selection */
   if (text->curl != text->sell || text->curc != text->selc) {
@@ -1663,7 +1663,7 @@ void draw_text_main(SpaceText *st, ARegion *region)
   if (st->showlinenrs) {
     uint pos = GPU_vertformat_attr_add(
         immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColor(TH_GRID);
     immRecti(pos, 0, 0, TXT_NUMCOL_WIDTH(st), region->winy);
     immUnbindProgram();
@@ -1726,7 +1726,7 @@ void draw_text_main(SpaceText *st, ARegion *region)
     if (margin_column_x >= x) {
       uint pos = GPU_vertformat_attr_add(
           immVertexFormat(), "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       float margin_color[4];
       UI_GetThemeColor4fv(TH_TEXT, margin_color);
       margin_color[3] = 0.2f;
diff --git a/source/blender/editors/space_text/text_format_py.c b/source/blender/editors/space_text/text_format_py.c
index aa361f07932..28f536ffa98 100644
--- a/source/blender/editors/space_text/text_format_py.c
+++ b/source/blender/editors/space_text/text_format_py.c
@@ -59,9 +59,9 @@ static int txtfmt_py_find_builtinfunc(const char *string)
   /* clang-format off */
 
   if        (STR_LITERAL_STARTSWITH(string, "and",      len)) { i = len;
-  } else if (STR_LITERAL_STARTSWITH(string, "as",       len)) { i = len;
   } else if (STR_LITERAL_STARTSWITH(string, "assert",   len)) { i = len;
   } else if (STR_LITERAL_STARTSWITH(string, "async",    len)) { i = len;
+  } else if (STR_LITERAL_STARTSWITH(string, "as",       len)) { i = len;
   } else if (STR_LITERAL_STARTSWITH(string, "await",    len)) { i = len;
   } else if (STR_LITERAL_STARTSWITH(string, "break",    len)) { i = len;
   } else if (STR_LITERAL_STARTSWITH(string, "case",     len)) { i = len;
diff --git a/source/blender/editors/space_text/text_ops.c b/source/blender/editors/space_text/text_ops.c
index 05d51cf6362..f0196bf8e00 100644
--- a/source/blender/editors/space_text/text_ops.c
+++ b/source/blender/editors/space_text/text_ops.c
@@ -273,7 +273,7 @@ static int text_new_exec(bContext *C, wmOperator *UNUSED(op))
   PointerRNA ptr, idptr;
   PropertyRNA *prop;
 
-  text = BKE_text_add(bmain, "Text");
+  text = BKE_text_add(bmain, DATA_("Text"));
 
   /* hook into UI */
   UI_context_active_but_prop_get_templateID(C, &ptr, &prop);
@@ -3396,7 +3396,8 @@ static int text_line_number_invoke(bContext *C, wmOperator *UNUSED(op), const wm
     return OPERATOR_PASS_THROUGH;
   }
 
-  if (!(event->ascii >= '0' && event->ascii <= '9')) {
+  const char event_ascii = WM_event_utf8_to_ascii(event);
+  if (!(event_ascii >= '0' && event_ascii <= '9')) {
     return OPERATOR_PASS_THROUGH;
   }
 
@@ -3406,7 +3407,7 @@ static int text_line_number_invoke(bContext *C, wmOperator *UNUSED(op), const wm
   }
 
   jump_to *= 10;
-  jump_to += (int)(event->ascii - '0');
+  jump_to += (int)(event_ascii - '0');
 
   txt_move_toline(text, jump_to - 1, 0);
   last_jump = time;
@@ -3495,16 +3496,8 @@ static int text_insert_invoke(bContext *C, wmOperator *op, const wmEvent *event)
     }
 
     char str[BLI_UTF8_MAX + 1];
-    size_t len;
-
-    if (event->utf8_buf[0]) {
-      len = BLI_str_utf8_size_safe(event->utf8_buf);
-      memcpy(str, event->utf8_buf, len);
-    }
-    else {
-      /* in theory, ghost can set value to extended ascii here */
-      len = BLI_str_utf8_from_unicode(event->ascii, str, sizeof(str) - 1);
-    }
+    const size_t len = BLI_str_utf8_size_safe(event->utf8_buf);
+    memcpy(str, event->utf8_buf, len);
     str[len] = '\0';
     RNA_string_set(op->ptr, "text", str);
 
diff --git a/source/blender/editors/space_topbar/CMakeLists.txt b/source/blender/editors/space_topbar/CMakeLists.txt
index 26c6b796df5..f529c855e6d 100644
--- a/source/blender/editors/space_topbar/CMakeLists.txt
+++ b/source/blender/editors/space_topbar/CMakeLists.txt
@@ -10,7 +10,6 @@ set(INC
   ../../makesdna
   ../../makesrna
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
diff --git a/source/blender/editors/space_topbar/space_topbar.c b/source/blender/editors/space_topbar/space_topbar.c
index bc68de1dfce..e4826ed5964 100644
--- a/source/blender/editors/space_topbar/space_topbar.c
+++ b/source/blender/editors/space_topbar/space_topbar.c
@@ -116,7 +116,7 @@ static void topbar_header_region_init(wmWindowManager *UNUSED(wm), ARegion *regi
 static void topbar_main_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -146,7 +146,7 @@ static void topbar_main_region_listener(const wmRegionListenerParams *params)
 static void topbar_header_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -288,7 +288,7 @@ void ED_spacetype_topbar(void)
   ARegionType *art;
 
   st->spaceid = SPACE_TOPBAR;
-  strncpy(st->name, "Top Bar", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Top Bar");
 
   st->create = topbar_create;
   st->free = topbar_free;
diff --git a/source/blender/editors/space_userpref/space_userpref.c b/source/blender/editors/space_userpref/space_userpref.c
index 1cda9cc0f0c..06a4c1d8702 100644
--- a/source/blender/editors/space_userpref/space_userpref.c
+++ b/source/blender/editors/space_userpref/space_userpref.c
@@ -189,7 +189,7 @@ void ED_spacetype_userpref(void)
   ARegionType *art;
 
   st->spaceid = SPACE_USERPREF;
-  strncpy(st->name, "Userpref", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "Userpref");
 
   st->create = userpref_create;
   st->free = userpref_free;
diff --git a/source/blender/editors/space_view3d/CMakeLists.txt b/source/blender/editors/space_view3d/CMakeLists.txt
index a76cd3377bc..27a0cd8e55a 100644
--- a/source/blender/editors/space_view3d/CMakeLists.txt
+++ b/source/blender/editors/space_view3d/CMakeLists.txt
@@ -15,7 +15,6 @@ set(INC
   ../../makesrna
   ../../render
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   ../../../../intern/mantaflow/extern
 
@@ -61,7 +60,7 @@ set(SRC
   view3d_ops.c
   view3d_placement.c
   view3d_project.c
-  view3d_select.c
+  view3d_select.cc
   view3d_snap.c
   view3d_utils.c
   view3d_view.c
@@ -76,7 +75,7 @@ set(LIB
 )
 
 if(WITH_PYTHON)
-  blender_include_dirs(../../python)
+  list(APPEND INC ../../python)
   add_definitions(-DWITH_PYTHON)
 endif()
 
diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 8add6886584..36ced74a8b7 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -16,6 +16,7 @@
 #include "BKE_customdata.h"
 #include "BKE_editmesh.h"
 #include "BKE_global.h"
+#include "BKE_mesh.h"
 #include "BKE_object.h"
 
 #include "DEG_depsgraph.h"
@@ -67,9 +68,9 @@ void ED_draw_object_facemap(Depsgraph *depsgraph,
   if (facemap_data) {
     GPU_blend(GPU_BLEND_ALPHA);
 
-    const MVert *mvert = me->mvert;
-    const MPoly *mpoly = me->mpoly;
-    const MLoop *mloop = me->mloop;
+    const MVert *verts = BKE_mesh_verts(me);
+    const MPoly *polys = BKE_mesh_polys(me);
+    const MLoop *loops = BKE_mesh_loops(me);
 
     int mpoly_len = me->totpoly;
     int mloop_len = me->totloop;
@@ -95,12 +96,12 @@ void ED_draw_object_facemap(Depsgraph *depsgraph,
     int i;
     if (me->runtime.looptris.array) {
       const MLoopTri *mlt = me->runtime.looptris.array;
-      for (mp = mpoly, i = 0; i < mpoly_len; i++, mp++) {
+      for (mp = polys, i = 0; i < mpoly_len; i++, mp++) {
         if (facemap_data[i] == facemap) {
           for (int j = 2; j < mp->totloop; j++) {
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[mloop[mlt->tri[0]].v].co);
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[mloop[mlt->tri[1]].v].co);
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[mloop[mlt->tri[2]].v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[0]].v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[1]].v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[2]].v].co);
             vbo_len_used += 3;
             mlt++;
           }
@@ -112,15 +113,15 @@ void ED_draw_object_facemap(Depsgraph *depsgraph,
     }
     else {
       /* No tessellation data, fan-fill. */
-      for (mp = mpoly, i = 0; i < mpoly_len; i++, mp++) {
+      for (mp = polys, i = 0; i < mpoly_len; i++, mp++) {
         if (facemap_data[i] == facemap) {
-          const MLoop *ml_start = &mloop[mp->loopstart];
+          const MLoop *ml_start = &loops[mp->loopstart];
           const MLoop *ml_a = ml_start + 1;
           const MLoop *ml_b = ml_start + 2;
           for (int j = 2; j < mp->totloop; j++) {
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[ml_start->v].co);
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[ml_a->v].co);
-            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), mvert[ml_b->v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_start->v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_a->v].co);
+            copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_b->v].co);
             vbo_len_used += 3;
 
             ml_a++;
diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index a423a842019..723a5f859a6 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -742,7 +742,7 @@ static void view3d_ob_drop_copy_external_asset(bContext *UNUSED(C), wmDrag *drag
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
-  BKE_view_layer_base_deselect_all(view_layer);
+  BKE_view_layer_base_deselect_all(scene, view_layer);
 
   ID *id = WM_drag_asset_id_import(asset_drag, FILE_AUTOSELECT);
 
@@ -752,6 +752,7 @@ static void view3d_ob_drop_copy_external_asset(bContext *UNUSED(C), wmDrag *drag
 
   RNA_int_set(drop->ptr, "session_uuid", id->session_uuid);
 
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = BKE_view_layer_base_find(view_layer, (Object *)id);
   if (base != NULL) {
     BKE_view_layer_base_select_and_set_active(view_layer, base);
@@ -791,7 +792,7 @@ static void view3d_collection_drop_copy_external_asset(bContext *UNUSED(C),
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
-  BKE_view_layer_base_deselect_all(view_layer);
+  BKE_view_layer_base_deselect_all(scene, view_layer);
 
   ID *id = WM_drag_asset_id_import(asset_drag, FILE_AUTOSELECT);
   Collection *collection = (Collection *)id;
@@ -804,6 +805,7 @@ static void view3d_collection_drop_copy_external_asset(bContext *UNUSED(C),
 
   /* Make an object active, just use the first one in the collection. */
   CollectionObject *cobject = collection->gobject.first;
+  BKE_view_layer_synced_ensure(scene, view_layer);
   Base *base = cobject ? BKE_view_layer_base_find(view_layer, cobject->ob) : NULL;
   if (base) {
     BLI_assert((base->flag & BASE_SELECTABLE) && (base->flag & BASE_ENABLED_VIEWPORT));
@@ -960,7 +962,7 @@ static void view3d_widgets(void)
   WM_gizmogrouptype_append_and_link(gzmap_type, VIEW3D_GGT_camera);
   WM_gizmogrouptype_append_and_link(gzmap_type, VIEW3D_GGT_camera_view);
   WM_gizmogrouptype_append_and_link(gzmap_type, VIEW3D_GGT_empty_image);
-  /* TODO(campbell): Not working well enough, disable for now. */
+  /* TODO(@campbellbarton): Not working well enough, disable for now. */
 #if 0
   WM_gizmogrouptype_append_and_link(gzmap_type, VIEW3D_GGT_armature_spline);
 #endif
@@ -1037,7 +1039,7 @@ static void view3d_main_region_listener(const wmRegionListenerParams *params)
   wmWindow *window = params->window;
   ScrArea *area = params->area;
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   const Scene *scene = params->scene;
   View3D *v3d = area->spacedata.first;
   RegionView3D *rv3d = region->regiondata;
@@ -1210,6 +1212,9 @@ static void view3d_main_region_listener(const wmRegionListenerParams *params)
           break;
       }
       break;
+    case NC_NODE:
+      ED_region_tag_redraw(region);
+      break;
     case NC_WORLD:
       switch (wmn->data) {
         case ND_WORLD_DRAW:
@@ -1401,8 +1406,10 @@ static void view3d_main_region_message_subscribe(const wmRegionMessageSubscribeP
   WM_msg_subscribe_rna_anon_type(mbus, SceneDisplay, &msg_sub_value_region_tag_redraw);
   WM_msg_subscribe_rna_anon_type(mbus, ObjectDisplay, &msg_sub_value_region_tag_redraw);
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   if (obact != NULL) {
     switch (obact->mode) {
       case OB_MODE_PARTICLE_EDIT:
@@ -1436,8 +1443,10 @@ static void view3d_main_region_cursor(wmWindow *win, ScrArea *area, ARegion *reg
     return;
   }
 
+  Scene *scene = WM_window_get_active_scene(win);
   ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-  Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *obedit = BKE_view_layer_edit_object_get(view_layer);
   if (obedit) {
     WM_cursor_set(win, WM_CURSOR_EDIT);
   }
@@ -1464,7 +1473,7 @@ static void view3d_header_region_draw(const bContext *C, ARegion *region)
 static void view3d_header_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1501,7 +1510,7 @@ static void view3d_header_region_listener(const wmRegionListenerParams *params)
       break;
   }
 
-    /* From topbar, which ones are needed? split per header? */
+    /* From top-bar, which ones are needed? split per header? */
     /* Disable for now, re-enable if needed, or remove - campbell. */
 #if 0
   /* context changes */
@@ -1681,7 +1690,7 @@ static void view3d_buttons_region_layout(const bContext *C, ARegion *region)
 static void view3d_buttons_region_listener(const wmRegionListenerParams *params)
 {
   ARegion *region = params->region;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
 
   /* context changes */
   switch (wmn->category) {
@@ -1804,7 +1813,7 @@ static void view3d_tools_region_draw(const bContext *C, ARegion *region)
 static void space_view3d_listener(const wmSpaceTypeListenerParams *params)
 {
   ScrArea *area = params->area;
-  wmNotifier *wmn = params->notifier;
+  const wmNotifier *wmn = params->notifier;
   View3D *v3d = area->spacedata.first;
 
   /* context changes */
@@ -1885,11 +1894,14 @@ static int view3d_context(const bContext *C, const char *member, bContextDataRes
      * without showing the object.
      *
      * See T85532 for alternatives that were considered. */
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    if (view_layer->basact) {
-      Object *ob = view_layer->basact->object;
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Base *base = BKE_view_layer_active_base_get(view_layer);
+    if (base) {
+      Object *ob = base->object;
       /* if hidden but in edit mode, we still display, can happen with animation */
-      if ((view_layer->basact->flag & BASE_VISIBLE_DEPSGRAPH) != 0 ||
+      if ((base->flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) != 0 ||
           (ob->mode != OB_MODE_OBJECT)) {
         CTX_data_id_pointer_set(result, &ob->id);
       }
@@ -1969,7 +1981,7 @@ void ED_spacetype_view3d(void)
   ARegionType *art;
 
   st->spaceid = SPACE_VIEW3D;
-  strncpy(st->name, "View3D", BKE_ST_MAXNAME);
+  STRNCPY(st->name, "View3D");
 
   st->create = view3d_create;
   st->free = view3d_free;
diff --git a/source/blender/editors/space_view3d/view3d_buttons.c b/source/blender/editors/space_view3d/view3d_buttons.c
index 6786bf8404e..04824097e05 100644
--- a/source/blender/editors/space_view3d/view3d_buttons.c
+++ b/source/blender/editors/space_view3d/view3d_buttons.c
@@ -36,6 +36,7 @@
 #include "BKE_customdata.h"
 #include "BKE_deform.h"
 #include "BKE_editmesh.h"
+#include "BKE_layer.h"
 #include "BKE_object.h"
 #include "BKE_object_deform.h"
 #include "BKE_report.h"
@@ -994,7 +995,9 @@ static void v3d_editvertex_buts(uiLayout *layout, View3D *v3d, Object *ob, float
       if (apply_vcos || median->bv_weight || median->v_crease || median->skin[0] ||
           median->skin[1]) {
         if (median->bv_weight) {
-          BM_mesh_cd_flag_ensure(bm, me, ME_CDFLAG_VERT_BWEIGHT);
+          if (!CustomData_has_layer(&bm->vdata, CD_BWEIGHT)) {
+            BM_data_layer_add(bm, &bm->vdata, CD_BWEIGHT);
+          }
           cd_vert_bweight_offset = CustomData_get_offset(&bm->vdata, CD_BWEIGHT);
           BLI_assert(cd_vert_bweight_offset != -1);
 
@@ -1060,7 +1063,9 @@ static void v3d_editvertex_buts(uiLayout *layout, View3D *v3d, Object *ob, float
 
       if (median->be_weight || median->e_crease) {
         if (median->be_weight) {
-          BM_mesh_cd_flag_ensure(bm, me, ME_CDFLAG_EDGE_BWEIGHT);
+          if (!CustomData_has_layer(&bm->edata, CD_BWEIGHT)) {
+            BM_data_layer_add(bm, &bm->edata, CD_BWEIGHT);
+          }
           cd_edge_bweight_offset = CustomData_get_offset(&bm->edata, CD_BWEIGHT);
           BLI_assert(cd_edge_bweight_offset != -1);
 
@@ -1273,8 +1278,10 @@ static void do_view3d_vgroup_buttons(bContext *C, void *UNUSED(arg), int event)
     return;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = view_layer->basact->object;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   ED_vgroup_vert_active_mirror(ob, event - B_VGRP_PNL_EDIT_SINGLE);
   DEG_id_tag_update(ob->data, ID_RECALC_GEOMETRY);
   WM_event_add_notifier(C, NC_GEOM | ND_DATA, ob->data);
@@ -1282,8 +1289,10 @@ static void do_view3d_vgroup_buttons(bContext *C, void *UNUSED(arg), int event)
 
 static bool view3d_panel_vgroup_poll(const bContext *C, PanelType *UNUSED(pt))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   if (ob && (BKE_object_is_in_editmode_vgroup(ob) || BKE_object_is_in_wpaint_select_vert(ob))) {
     MDeformVert *dvert_act = ED_mesh_active_dvert_get_only(ob);
     if (dvert_act) {
@@ -1299,7 +1308,8 @@ static void view3d_panel_vgroup(const bContext *C, Panel *panel)
   uiBlock *block = uiLayoutAbsoluteBlock(panel->layout);
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = view_layer->basact->object;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   MDeformVert *dv;
 
@@ -1681,9 +1691,11 @@ static void v3d_editmetaball_buts(uiLayout *layout, Object *ob)
 
 static void do_view3d_region_buttons(bContext *C, void *UNUSED(index), int event)
 {
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   switch (event) {
 
@@ -1710,15 +1722,19 @@ static void do_view3d_region_buttons(bContext *C, void *UNUSED(index), int event
 
 static bool view3d_panel_transform_poll(const bContext *C, PanelType *UNUSED(pt))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  return (view_layer->basact != NULL);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  return (BKE_view_layer_active_base_get(view_layer) != NULL);
 }
 
 static void view3d_panel_transform(const bContext *C, Panel *panel)
 {
   uiBlock *block;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = view_layer->basact->object;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Object *obedit = OBEDIT_FROM_OBACT(ob);
   uiLayout *col;
 
diff --git a/source/blender/editors/space_view3d/view3d_cursor_snap.c b/source/blender/editors/space_view3d/view3d_cursor_snap.c
index 4a1bd6ba945..72e1f6f46c7 100644
--- a/source/blender/editors/space_view3d/view3d_cursor_snap.c
+++ b/source/blender/editors/space_view3d/view3d_cursor_snap.c
@@ -16,6 +16,7 @@
 
 #include "BKE_context.h"
 #include "BKE_global.h"
+#include "BKE_layer.h"
 #include "BKE_main.h"
 #include "BKE_object.h"
 #include "BKE_scene.h"
@@ -495,6 +496,16 @@ static void v3d_cursor_eventstate_save_xy(SnapCursorDataIntern *cursor_snap,
 }
 
 #ifdef USE_SNAP_DETECT_FROM_KEYMAP_HACK
+static void v3d_cursor_eventstate_save_modifier(SnapCursorDataIntern *data_intern,
+                                                const wmWindowManager *wm)
+{
+  if (!wm || !wm->winactive) {
+    return;
+  }
+  const wmEvent *event = wm->winactive->eventstate;
+  data_intern->last_eventstate.modifier = event->modifier;
+}
+
 static bool v3d_cursor_is_snap_invert(SnapCursorDataIntern *data_intern, const wmWindowManager *wm)
 {
   if (!wm || !wm->winactive) {
@@ -582,10 +593,14 @@ static void v3d_cursor_snap_update(V3DSnapCursorState *state,
 {
   SnapCursorDataIntern *data_intern = &g_data_intern;
   V3DSnapCursorData *snap_data = &data_intern->snap_data;
-  v3d_cursor_snap_context_ensure(scene);
+
+  const bool use_surface_nor = state->plane_orient == V3D_PLACE_ORIENT_SURFACE;
+  const bool use_surface_co = state->plane_depth == V3D_PLACE_DEPTH_SURFACE;
+  const bool calc_plane_omat = v3d_cursor_snap_calc_plane();
 
   float co[3], no[3], face_nor[3], obmat[4][4], omat[3][3];
   eSnapMode snap_elem = SCE_SNAP_MODE_NONE;
+  eSnapMode snap_elements = v3d_cursor_snap_elements(state, scene);
   int snap_elem_index[3] = {-1, -1, -1};
   int index = -1;
 
@@ -594,83 +609,91 @@ static void v3d_cursor_snap_update(V3DSnapCursorState *state,
   zero_v3(face_nor);
   unit_m3(omat);
 
-  eSnapMode snap_elements = v3d_cursor_snap_elements(state, scene);
-  data_intern->snap_elem_hidden = SCE_SNAP_MODE_NONE;
-  const bool calc_plane_omat = v3d_cursor_snap_calc_plane();
-  if (calc_plane_omat && !(snap_elements & SCE_SNAP_MODE_FACE_RAYCAST)) {
-    data_intern->snap_elem_hidden = SCE_SNAP_MODE_FACE_RAYCAST;
-    snap_elements |= SCE_SNAP_MODE_FACE_RAYCAST;
-  }
+  if (use_surface_nor || use_surface_co) {
+    v3d_cursor_snap_context_ensure(scene);
+
+    data_intern->snap_elem_hidden = SCE_SNAP_MODE_NONE;
+    if (calc_plane_omat && !(snap_elements & SCE_SNAP_MODE_FACE_RAYCAST)) {
+      data_intern->snap_elem_hidden = SCE_SNAP_MODE_FACE_RAYCAST;
+      snap_elements |= SCE_SNAP_MODE_FACE_RAYCAST;
+    }
 
-  snap_data->is_enabled = true;
+    snap_data->is_enabled = true;
 #ifdef USE_SNAP_DETECT_FROM_KEYMAP_HACK
-  if (!(state->flag & V3D_SNAPCURSOR_TOGGLE_ALWAYS_TRUE)) {
-    snap_data->is_snap_invert = v3d_cursor_is_snap_invert(data_intern, wm);
-
-    const ToolSettings *ts = scene->toolsettings;
-    if (snap_data->is_snap_invert != !(ts->snap_flag & SCE_SNAP)) {
-      snap_data->is_enabled = false;
-      if (!calc_plane_omat) {
-        snap_data->snap_elem = SCE_SNAP_MODE_NONE;
-        return;
+    if (!(state->flag & V3D_SNAPCURSOR_TOGGLE_ALWAYS_TRUE)) {
+      snap_data->is_snap_invert = v3d_cursor_is_snap_invert(data_intern, wm);
+
+      const ToolSettings *ts = scene->toolsettings;
+      if (snap_data->is_snap_invert != !(ts->snap_flag & SCE_SNAP)) {
+        snap_data->is_enabled = false;
+        if (!calc_plane_omat) {
+          snap_data->snap_elem = SCE_SNAP_MODE_NONE;
+          return;
+        }
+        snap_elements = data_intern->snap_elem_hidden = SCE_SNAP_MODE_FACE_RAYCAST;
       }
-      snap_elements = data_intern->snap_elem_hidden = SCE_SNAP_MODE_FACE_RAYCAST;
     }
-  }
 #endif
 
-  if (snap_elements & SCE_SNAP_MODE_GEOM) {
-    float prev_co[3] = {0.0f};
-    if (state->prevpoint) {
-      copy_v3_v3(prev_co, state->prevpoint);
-    }
-    else {
-      snap_elements &= ~SCE_SNAP_MODE_EDGE_PERPENDICULAR;
-    }
+    if (snap_elements & SCE_SNAP_MODE_GEOM) {
+      float prev_co[3] = {0.0f};
+      if (state->prevpoint) {
+        copy_v3_v3(prev_co, state->prevpoint);
+      }
+      else {
+        snap_elements &= ~SCE_SNAP_MODE_EDGE_PERPENDICULAR;
+      }
 
-    eSnapEditType edit_mode_type = (state->flag & V3D_SNAPCURSOR_SNAP_EDIT_GEOM_FINAL) ?
-                                       SNAP_GEOM_FINAL :
-                                   (state->flag & V3D_SNAPCURSOR_SNAP_EDIT_GEOM_CAGE) ?
-                                       SNAP_GEOM_CAGE :
-                                       SNAP_GEOM_EDIT;
-
-    bool use_occlusion_test = (state->flag & V3D_SNAPCURSOR_OCCLUSION_ALWAYS_TRUE) ? false : true;
-
-    float dist_px = 12.0f * U.pixelsize;
-
-    snap_elem = ED_transform_snap_object_project_view3d_ex(
-        data_intern->snap_context_v3d,
-        depsgraph,
-        region,
-        v3d,
-        snap_elements,
-        &(const struct SnapObjectParams){
-            .snap_target_select = SCE_SNAP_TARGET_ALL,
-            .edit_mode_type = edit_mode_type,
-            .use_occlusion_test = use_occlusion_test,
-        },
-        NULL,
-        mval_fl,
-        prev_co,
-        &dist_px,
-        co,
-        no,
-        &index,
-        NULL,
-        obmat,
-        face_nor);
+      eSnapEditType edit_mode_type = (state->flag & V3D_SNAPCURSOR_SNAP_EDIT_GEOM_FINAL) ?
+                                         SNAP_GEOM_FINAL :
+                                     (state->flag & V3D_SNAPCURSOR_SNAP_EDIT_GEOM_CAGE) ?
+                                         SNAP_GEOM_CAGE :
+                                         SNAP_GEOM_EDIT;
+
+      bool use_occlusion_test = (state->flag & V3D_SNAPCURSOR_OCCLUSION_ALWAYS_TRUE) ? false :
+                                                                                       true;
+
+      float dist_px = 12.0f * U.pixelsize;
+
+      snap_elem = ED_transform_snap_object_project_view3d_ex(
+          data_intern->snap_context_v3d,
+          depsgraph,
+          region,
+          v3d,
+          snap_elements,
+          &(const struct SnapObjectParams){
+              .snap_target_select = SCE_SNAP_TARGET_ALL,
+              .edit_mode_type = edit_mode_type,
+              .use_occlusion_test = use_occlusion_test,
+          },
+          NULL,
+          mval_fl,
+          prev_co,
+          &dist_px,
+          co,
+          no,
+          &index,
+          NULL,
+          obmat,
+          face_nor);
+    }
+  }
+#ifdef USE_SNAP_DETECT_FROM_KEYMAP_HACK
+  else {
+    v3d_cursor_eventstate_save_modifier(data_intern, wm);
   }
+#endif
 
   if (calc_plane_omat) {
     RegionView3D *rv3d = region->regiondata;
-    bool orient_surface = (snap_elem != SCE_SNAP_MODE_NONE) &&
-                          (state->plane_orient == V3D_PLACE_ORIENT_SURFACE);
+    bool orient_surface = use_surface_nor && (snap_elem != SCE_SNAP_MODE_NONE);
     if (orient_surface) {
       copy_m3_m4(omat, obmat);
     }
     else {
       ViewLayer *view_layer = CTX_data_view_layer(C);
-      Object *ob = OBACT(view_layer);
+      BKE_view_layer_synced_ensure(CTX_data_scene(C), view_layer);
+      Object *ob = BKE_view_layer_active_object_get(view_layer);
       const int orient_index = BKE_scene_orientation_get_index(scene, SCE_ORIENT_DEFAULT);
       const int pivot_point = scene->toolsettings->transform_pivot_point;
       ED_transform_calc_orientation_from_type_ex(
@@ -715,6 +738,10 @@ static void v3d_cursor_snap_update(V3DSnapCursorState *state,
     }
   }
 
+  if (!use_surface_co) {
+    snap_elem = SCE_SNAP_MODE_NONE;
+  }
+
   float *co_depth = (snap_elem != SCE_SNAP_MODE_NONE) ? co : scene->cursor.location;
   snap_elem &= ~data_intern->snap_elem_hidden;
   if (snap_elem == SCE_SNAP_MODE_NONE) {
diff --git a/source/blender/editors/space_view3d/view3d_draw.c b/source/blender/editors/space_view3d/view3d_draw.c
index 5405867be56..219c70cffae 100644
--- a/source/blender/editors/space_view3d/view3d_draw.c
+++ b/source/blender/editors/space_view3d/view3d_draw.c
@@ -567,7 +567,7 @@ static void drawviewborder(Scene *scene, Depsgraph *depsgraph, ARegion *region,
 
   /* First, solid lines. */
   {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     /* passepartout, specified in camera edit buttons */
     if (ca && (ca->flag & CAM_SHOWPASSEPARTOUT) && ca->passepartalpha > 0.000001f) {
@@ -618,7 +618,7 @@ static void drawviewborder(Scene *scene, Depsgraph *depsgraph, ARegion *region,
   }
 
   /* And now, the dashed lines! */
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   {
     float viewport_size[4];
@@ -800,7 +800,7 @@ static void drawrenderborder(ARegion *region, View3D *v3d)
 
   GPU_line_width(1.0f);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -982,7 +982,7 @@ static void draw_view_axis(RegionView3D *rv3d, const rcti *rect)
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
   uint col = GPU_vertformat_attr_add(format, "color", GPU_COMP_U8, 4, GPU_FETCH_INT_TO_FLOAT_UNIT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_FLAT_COLOR);
   immBegin(GPU_PRIM_LINES, 6);
 
   for (int axis_i = 0; axis_i < 3; axis_i++) {
@@ -1306,7 +1306,8 @@ static void draw_selected_name(
   s += sprintf(s, "(%d)", cfra);
 
   if ((ob == NULL) || (ob->mode == OB_MODE_OBJECT)) {
-    LayerCollection *layer_collection = view_layer->active_collection;
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LayerCollection *layer_collection = BKE_view_layer_active_collection_get(view_layer);
     s += sprintf(s,
                  " %s%s",
                  BKE_collection_ui_name_get(layer_collection->collection),
@@ -1352,7 +1353,7 @@ static void draw_selected_name(
       }
     }
     else if (ELEM(ob->type, OB_MESH, OB_LATTICE, OB_CURVES_LEGACY)) {
-      /* try to display active bone and active shapekey too (if they exist) */
+      /* Try to display active bone and active shape-key too (if they exist). */
 
       if (ob->type == OB_MESH && ob->mode & OB_MODE_WEIGHT_PAINT) {
         Object *armobj = BKE_object_pose_armature_get(ob);
@@ -1497,7 +1498,8 @@ void view3d_draw_region_info(const bContext *C, ARegion *region)
     }
 
     if (U.uiflag & USER_DRAWVIEWINFO) {
-      Object *ob = OBACT(view_layer);
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      Object *ob = BKE_view_layer_active_object_get(view_layer);
       draw_selected_name(scene, view_layer, ob, xoffset, &yoffset);
     }
 
@@ -2121,6 +2123,7 @@ bool ED_view3d_clipping_test(const RegionView3D *rv3d, const float co[3], const
  * \note Only use in object mode.
  */
 static void validate_object_select_id(struct Depsgraph *depsgraph,
+                                      const Scene *scene,
                                       ViewLayer *view_layer,
                                       ARegion *region,
                                       View3D *v3d,
@@ -2152,7 +2155,8 @@ static void validate_object_select_id(struct Depsgraph *depsgraph,
     return;
   }
 
-  if (obact_eval && ((obact_eval->base_flag & BASE_VISIBLE_DEPSGRAPH) != 0)) {
+  if (obact_eval && ((obact_eval->base_flag & BASE_ENABLED_AND_MAYBE_VISIBLE_IN_VIEWPORT) != 0)) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
     Base *base = BKE_view_layer_base_find(view_layer, obact);
     DRW_select_buffer_context_create(&base, 1, -1);
   }
@@ -2188,7 +2192,8 @@ static void view3d_opengl_read_Z_pixels(GPUViewport *viewport, rcti *rect, void
 
 void ED_view3d_select_id_validate(ViewContext *vc)
 {
-  validate_object_select_id(vc->depsgraph, vc->view_layer, vc->region, vc->v3d, vc->obact);
+  validate_object_select_id(
+      vc->depsgraph, vc->scene, vc->view_layer, vc->region, vc->v3d, vc->obact);
 }
 
 int ED_view3d_backbuf_sample_size_clamp(ARegion *region, const float dist)
@@ -2247,16 +2252,16 @@ void view3d_depths_rect_create(ARegion *region, rcti *rect, ViewDepths *r_d)
 static ViewDepths *view3d_depths_create(ARegion *region)
 {
   ViewDepths *d = MEM_callocN(sizeof(ViewDepths), "ViewDepths");
-  d->w = region->winx;
-  d->h = region->winy;
 
   {
     GPUViewport *viewport = WM_draw_region_get_viewport(region);
     GPUTexture *depth_tx = GPU_viewport_depth_texture(viewport);
     uint32_t *int_depths = GPU_texture_read(depth_tx, GPU_DATA_UINT_24_8, 0);
+    d->w = GPU_texture_width(depth_tx);
+    d->h = GPU_texture_height(depth_tx);
     d->depths = (float *)int_depths;
     /* Convert in-place. */
-    int pixel_count = GPU_texture_width(depth_tx) * GPU_texture_height(depth_tx);
+    int pixel_count = d->w * d->h;
     for (int i = 0; i < pixel_count; i++) {
       d->depths[i] = (int_depths[i] >> 8u) / (float)0xFFFFFF;
     }
diff --git a/source/blender/editors/space_view3d/view3d_edit.c b/source/blender/editors/space_view3d/view3d_edit.c
index 041663b4a00..6001f701c00 100644
--- a/source/blender/editors/space_view3d/view3d_edit.c
+++ b/source/blender/editors/space_view3d/view3d_edit.c
@@ -413,7 +413,9 @@ static void view3d_set_1_to_1_viewborder(Scene *scene,
 {
   RegionView3D *rv3d = region->regiondata;
   float size[2];
-  int im_width = (scene->r.size * scene->r.xsch) / 100;
+
+  int im_width, im_height;
+  BKE_render_resolution(&scene->r, false, &im_width, &im_height);
 
   ED_view3d_calc_camera_border_size(scene, depsgraph, region, v3d, rv3d, size);
 
@@ -695,7 +697,7 @@ static int drop_world_exec(bContext *C, wmOperator *op)
   id_us_plus(&world->id);
   scene->world = world;
 
-  DEG_id_tag_update(&scene->id, 0);
+  DEG_id_tag_update(&scene->id, ID_RECALC_COPY_ON_WRITE);
   DEG_relations_tag_update(bmain);
 
   WM_event_add_notifier(C, NC_SCENE | ND_WORLD, scene);
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_armature.c b/source/blender/editors/space_view3d/view3d_gizmo_armature.c
index 3f6167d92ca..4f73e2fada2 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_armature.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_armature.c
@@ -37,7 +37,7 @@
  * \{ */
 
 /*
- * TODO(campbell): Current conversion is a approximation (usable not correct),
+ * TODO(@campbellbarton): Current conversion is a approximation (usable not correct),
  * we'll need to take the next/previous bones into account to get the tangent directions.
  * First last matrices from 'BKE_pchan_bbone_spline_setup' are close but also not quite accurate
  * since they're not at either end-points on the curve.
@@ -113,8 +113,10 @@ static bool WIDGETGROUP_armature_spline_poll(const bContext *C, wmGizmoGroupType
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = BKE_object_pose_armature_get(base->object);
     if (ob) {
@@ -132,8 +134,10 @@ static bool WIDGETGROUP_armature_spline_poll(const bContext *C, wmGizmoGroupType
 
 static void WIDGETGROUP_armature_spline_setup(const bContext *C, wmGizmoGroup *gzgroup)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = BKE_object_pose_armature_get(OBACT(view_layer));
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_object_pose_armature_get(BKE_view_layer_active_object_get(view_layer));
   bPoseChannel *pchan = BKE_pose_channel_active_if_layer_visible(ob);
 
   const wmGizmoType *gzt_move = WM_gizmotype_find("GIZMO_GT_move_3d", true);
@@ -165,8 +169,10 @@ static void WIDGETGROUP_armature_spline_setup(const bContext *C, wmGizmoGroup *g
 
 static void WIDGETGROUP_armature_spline_refresh(const bContext *C, wmGizmoGroup *gzgroup)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = BKE_object_pose_armature_get(OBACT(view_layer));
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_object_pose_armature_get(BKE_view_layer_active_object_get(view_layer));
 
   if (!gzgroup->customdata) {
     return;
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_camera.c b/source/blender/editors/space_view3d/view3d_gizmo_camera.c
index 83f589a64c9..952ef56710b 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_camera.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_camera.c
@@ -55,8 +55,10 @@ static bool WIDGETGROUP_camera_poll(const bContext *C, wmGizmoGroupType *UNUSED(
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->type == OB_CAMERA) {
@@ -72,8 +74,10 @@ static bool WIDGETGROUP_camera_poll(const bContext *C, wmGizmoGroupType *UNUSED(
 
 static void WIDGETGROUP_camera_setup(const bContext *C, wmGizmoGroup *gzgroup)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   float dir[3];
 
   const wmGizmoType *gzt_arrow = WM_gizmotype_find("GIZMO_GT_arrow_3d", true);
@@ -124,8 +128,10 @@ static void WIDGETGROUP_camera_refresh(const bContext *C, wmGizmoGroup *gzgroup)
 
   struct CameraWidgetGroup *cagzgroup = gzgroup->customdata;
   View3D *v3d = CTX_wm_view3d(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Camera *ca = ob->data;
   PointerRNA camera_ptr;
   float dir[3];
@@ -151,7 +157,6 @@ static void WIDGETGROUP_camera_refresh(const bContext *C, wmGizmoGroup *gzgroup)
   }
 
   /* TODO: make focal length/ortho ob_scale_inv widget optional. */
-  const Scene *scene = CTX_data_scene(C);
   const float aspx = (float)scene->r.xsch * scene->r.xasp;
   const float aspy = (float)scene->r.ysch * scene->r.yasp;
   const bool is_ortho = (ca->type == CAM_ORTHO);
@@ -241,8 +246,10 @@ static void WIDGETGROUP_camera_message_subscribe(const bContext *C,
                                                  struct wmMsgBus *mbus)
 {
   ARegion *region = CTX_wm_region(C);
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Camera *ca = ob->data;
 
   wmMsgSubscribeValue msg_sub_value_gz_tag_refresh = {
@@ -370,7 +377,8 @@ static bool WIDGETGROUP_camera_view_poll(const bContext *C, wmGizmoGroupType *UN
    * We could change the rules for when to show. */
   {
     ViewLayer *view_layer = CTX_data_view_layer(C);
-    if (scene->camera != OBACT(view_layer)) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (scene->camera != BKE_view_layer_active_object_get(view_layer)) {
       return false;
     }
   }
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_empty.c b/source/blender/editors/space_view3d/view3d_gizmo_empty.c
index f113cc60224..41a763192ce 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_empty.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_empty.c
@@ -99,8 +99,10 @@ static bool WIDGETGROUP_empty_image_poll(const bContext *C, wmGizmoGroupType *UN
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->type == OB_EMPTY) {
@@ -132,8 +134,10 @@ static void WIDGETGROUP_empty_image_refresh(const bContext *C, wmGizmoGroup *gzg
 {
   struct EmptyImageWidgetGroup *igzgroup = gzgroup->customdata;
   wmGizmo *gz = igzgroup->gizmo;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   copy_m4_m4(gz->matrix_basis, ob->obmat);
 
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_forcefield.c b/source/blender/editors/space_view3d/view3d_gizmo_forcefield.c
index 456e939eba7..58b43301397 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_forcefield.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_forcefield.c
@@ -42,8 +42,10 @@ static bool WIDGETGROUP_forcefield_poll(const bContext *C, wmGizmoGroupType *UNU
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->pd && ob->pd->forcefield) {
@@ -73,8 +75,10 @@ static void WIDGETGROUP_forcefield_refresh(const bContext *C, wmGizmoGroup *gzgr
 {
   wmGizmoWrapper *wwrapper = gzgroup->customdata;
   wmGizmo *gz = wwrapper->gizmo;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   PartDeflect *pd = ob->pd;
 
   if (pd->forcefield == PFIELD_WIND) {
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_light.c b/source/blender/editors/space_view3d/view3d_gizmo_light.c
index b3bc0bc70cb..df653f9a6e5 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_light.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_light.c
@@ -45,8 +45,10 @@ static bool WIDGETGROUP_light_spot_poll(const bContext *C, wmGizmoGroupType *UNU
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->type == OB_LAMP) {
@@ -76,8 +78,10 @@ static void WIDGETGROUP_light_spot_refresh(const bContext *C, wmGizmoGroup *gzgr
 {
   wmGizmoWrapper *wwrapper = gzgroup->customdata;
   wmGizmo *gz = wwrapper->gizmo;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Light *la = ob->data;
   float dir[3];
 
@@ -156,8 +160,10 @@ static bool WIDGETGROUP_light_area_poll(const bContext *C, wmGizmoGroupType *UNU
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->type == OB_LAMP) {
@@ -186,8 +192,10 @@ static void WIDGETGROUP_light_area_setup(const bContext *UNUSED(C), wmGizmoGroup
 static void WIDGETGROUP_light_area_refresh(const bContext *C, wmGizmoGroup *gzgroup)
 {
   wmGizmoWrapper *wwrapper = gzgroup->customdata;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Light *la = ob->data;
   wmGizmo *gz = wwrapper->gizmo;
 
@@ -239,8 +247,10 @@ static bool WIDGETGROUP_light_target_poll(const bContext *C, wmGizmoGroupType *U
     return false;
   }
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Base *base = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base = BKE_view_layer_active_base_get(view_layer);
   if (base && BASE_SELECTABLE(v3d, base)) {
     Object *ob = base->object;
     if (ob->type == OB_LAMP) {
@@ -280,8 +290,10 @@ static void WIDGETGROUP_light_target_setup(const bContext *UNUSED(C), wmGizmoGro
 static void WIDGETGROUP_light_target_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
 {
   wmGizmoWrapper *wwrapper = gzgroup->customdata;
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   wmGizmo *gz = wwrapper->gizmo;
 
   normalize_m4_m4(gz->matrix_basis, ob->obmat);
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_preselect_type.c b/source/blender/editors/space_view3d/view3d_gizmo_preselect_type.c
index a0c010a6813..d0f6ca4c922 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_preselect_type.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_preselect_type.c
@@ -125,12 +125,15 @@ static int gizmo_preselect_elem_test_select(bContext *C, wmGizmo *gz, const int
   };
 
   {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     View3D *v3d = CTX_wm_view3d(C);
-    if (((gz_ele->bases)) == NULL || (gz_ele->bases[0] != view_layer->basact)) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (((gz_ele->bases)) == NULL ||
+        (gz_ele->bases[0] != BKE_view_layer_active_base_get(view_layer))) {
       MEM_SAFE_FREE(gz_ele->bases);
       gz_ele->bases = BKE_view_layer_array_from_bases_in_edit_mode(
-          view_layer, v3d, &gz_ele->bases_len);
+          scene, view_layer, v3d, &gz_ele->bases_len);
     }
   }
 
@@ -351,12 +354,15 @@ static int gizmo_preselect_edgering_test_select(bContext *C, wmGizmo *gz, const
   };
 
   {
+    const Scene *scene = CTX_data_scene(C);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     View3D *v3d = CTX_wm_view3d(C);
-    if (((gz_ring->bases)) == NULL || (gz_ring->bases[0] != view_layer->basact)) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    if (((gz_ring->bases)) == NULL ||
+        (gz_ring->bases[0] != BKE_view_layer_active_base_get(view_layer))) {
       MEM_SAFE_FREE(gz_ring->bases);
       gz_ring->bases = BKE_view_layer_array_from_bases_in_edit_mode(
-          view_layer, v3d, &gz_ring->bases_len);
+          scene, view_layer, v3d, &gz_ring->bases_len);
     }
   }
 
@@ -488,6 +494,7 @@ void ED_view3d_gizmo_mesh_preselect_get_active(bContext *C,
                                                Base **r_base,
                                                BMElem **r_ele)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
 
   const int object_index = RNA_int_get(gz->ptr, "object_index");
@@ -498,7 +505,7 @@ void ED_view3d_gizmo_mesh_preselect_get_active(bContext *C,
   {
     uint bases_len;
     Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
-        view_layer, CTX_wm_view3d(C), &bases_len);
+        scene, view_layer, CTX_wm_view3d(C), &bases_len);
     if (object_index < bases_len) {
       base = bases[object_index];
       obedit = base->object;
diff --git a/source/blender/editors/space_view3d/view3d_gizmo_ruler.c b/source/blender/editors/space_view3d/view3d_gizmo_ruler.c
index 62dc461e05c..d95d49dd982 100644
--- a/source/blender/editors/space_view3d/view3d_gizmo_ruler.c
+++ b/source/blender/editors/space_view3d/view3d_gizmo_ruler.c
@@ -17,6 +17,7 @@
 #include "BKE_main.h"
 #include "BKE_report.h"
 
+#include "BKE_layer.h"
 #include "BKE_material.h"
 #include "BKE_object.h"
 #include "BKE_scene.h"
@@ -420,7 +421,8 @@ static bool view3d_ruler_item_mousemove(const bContext *C,
         Scene *scene = DEG_get_input_scene(depsgraph);
         ViewLayer *view_layer = DEG_get_input_view_layer(depsgraph);
         RegionView3D *rv3d = ruler_info->region->regiondata;
-        Object *ob = OBACT(view_layer);
+        BKE_view_layer_synced_ensure(scene, view_layer);
+        Object *ob = BKE_view_layer_active_object_get(view_layer);
         Object *obedit = OBEDIT_FROM_OBACT(ob);
 
         short orient_index = BKE_scene_orientation_get_index(scene, SCE_ORIENT_DEFAULT);
@@ -783,7 +785,7 @@ static void gizmo_ruler_draw(const bContext *C, wmGizmo *gz)
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
   if (ruler_item->flag & RULERITEM_USE_ANGLE) {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     /* capping */
     {
       float rot_90_vec_a[2];
@@ -885,7 +887,7 @@ static void gizmo_ruler_draw(const bContext *C, wmGizmo *gz)
     }
   }
   else {
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
     sub_v2_v2v2(dir_ruler, co_ss[0], co_ss[2]);
 
diff --git a/source/blender/editors/space_view3d/view3d_header.c b/source/blender/editors/space_view3d/view3d_header.c
index 6e8d9e96abd..45f7a3a8fe9 100644
--- a/source/blender/editors/space_view3d/view3d_header.c
+++ b/source/blender/editors/space_view3d/view3d_header.c
@@ -20,6 +20,7 @@
 
 #include "BKE_context.h"
 #include "BKE_editmesh.h"
+#include "BKE_layer.h"
 
 #include "DEG_depsgraph.h"
 
@@ -124,8 +125,10 @@ void uiTemplateEditModeSelection(uiLayout *layout, struct bContext *C)
 
 static void uiTemplatePaintModeSelection(uiLayout *layout, struct bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   /* Gizmos aren't used in paint modes */
   if (!ELEM(ob->mode, OB_MODE_SCULPT, OB_MODE_PARTICLE_EDIT)) {
@@ -146,8 +149,10 @@ static void uiTemplatePaintModeSelection(uiLayout *layout, struct bContext *C)
 
 void uiTemplateHeader3D_mode(uiLayout *layout, struct bContext *C)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Object *obedit = CTX_data_edit_object(C);
   bGPdata *gpd = CTX_data_gpencil_data(C);
 
diff --git a/source/blender/editors/space_view3d/view3d_intern.h b/source/blender/editors/space_view3d/view3d_intern.h
index 53fc450107a..4c9e2595023 100644
--- a/source/blender/editors/space_view3d/view3d_intern.h
+++ b/source/blender/editors/space_view3d/view3d_intern.h
@@ -9,6 +9,10 @@
 
 #include "ED_view3d.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* internal exports only */
 
 struct ARegion;
@@ -83,7 +87,7 @@ void view3d_depths_rect_create(struct ARegion *region, struct rcti *rect, struct
  */
 float view3d_depth_near(struct ViewDepths *d);
 
-/* view3d_select.c */
+/* view3d_select.cc */
 
 void VIEW3D_OT_select(struct wmOperatorType *ot);
 void VIEW3D_OT_select_circle(struct wmOperatorType *ot);
@@ -241,3 +245,7 @@ void VIEW3D_GGT_placement(struct wmGizmoGroupType *gzgt);
 extern uchar view3d_camera_border_hack_col[3];
 extern bool view3d_camera_border_hack_test;
 #endif
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/source/blender/editors/space_view3d/view3d_iterators.c b/source/blender/editors/space_view3d/view3d_iterators.c
index 35d4746608b..34f68e87880 100644
--- a/source/blender/editors/space_view3d/view3d_iterators.c
+++ b/source/blender/editors/space_view3d/view3d_iterators.c
@@ -23,6 +23,7 @@
 #include "BKE_curve.h"
 #include "BKE_displist.h"
 #include "BKE_editmesh.h"
+#include "BKE_mesh.h"
 #include "BKE_mesh_iterators.h"
 #include "BKE_mesh_runtime.h"
 #include "BKE_mesh_wrapper.h"
@@ -205,6 +206,8 @@ typedef struct foreachScreenObjectVert_userData {
   void (*func)(void *userData, MVert *mv, const float screen_co[2], int index);
   void *userData;
   ViewContext vc;
+  MVert *verts;
+  const bool *hide_vert;
   eV3DProjTest clip_flag;
 } foreachScreenObjectVert_userData;
 
@@ -244,7 +247,7 @@ typedef struct foreachScreenFace_userData {
 } foreachScreenFace_userData;
 
 /**
- * \note foreach funcs should be called while drawing or directly after
+ * \note foreach functions should be called while drawing or directly after
  * if not, #ED_view3d_init_mats_rv3d() can be used for selection tools
  * but would not give correct results with dupli's for eg. which don't
  * use the object matrix in the usual way.
@@ -262,18 +265,19 @@ static void meshobject_foreachScreenVert__mapFunc(void *userData,
                                                   const float UNUSED(no[3]))
 {
   foreachScreenObjectVert_userData *data = userData;
-  struct MVert *mv = &((Mesh *)(data->vc.obact->data))->mvert[index];
-
-  if (!(mv->flag & ME_HIDE)) {
-    float screen_co[2];
+  if (data->hide_vert && data->hide_vert[index]) {
+    return;
+  }
+  MVert *mv = &data->verts[index];
 
-    if (ED_view3d_project_float_object(data->vc.region, co, screen_co, data->clip_flag) !=
-        V3D_PROJ_RET_OK) {
-      return;
-    }
+  float screen_co[2];
 
-    data->func(data->userData, mv, screen_co, index);
+  if (ED_view3d_project_float_object(data->vc.region, co, screen_co, data->clip_flag) !=
+      V3D_PROJ_RET_OK) {
+    return;
   }
+
+  data->func(data->userData, mv, screen_co, index);
 }
 
 void meshobject_foreachScreenVert(
@@ -297,6 +301,9 @@ void meshobject_foreachScreenVert(
   data.func = func;
   data.userData = userData;
   data.clip_flag = clip_flag;
+  data.verts = BKE_mesh_verts_for_write((Mesh *)vc->obact->data);
+  data.hide_vert = (const bool *)CustomData_get_layer_named(
+      &me->vdata, CD_PROP_BOOL, ".hide_vert");
 
   if (clip_flag & V3D_PROJ_TEST_CLIP_BB) {
     ED_view3d_clipping_local(vc->rv3d, vc->obact->obmat);
diff --git a/source/blender/editors/space_view3d/view3d_navigate.c b/source/blender/editors/space_view3d/view3d_navigate.c
index 50d7626a57d..b27c65c42ef 100644
--- a/source/blender/editors/space_view3d/view3d_navigate.c
+++ b/source/blender/editors/space_view3d/view3d_navigate.c
@@ -164,9 +164,11 @@ bool view3d_orbit_calc_center(bContext *C, float r_dyn_ofs[3])
 
   const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   Scene *scene = CTX_data_scene(C);
+  Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
   ViewLayer *view_layer_eval = DEG_get_evaluated_view_layer(depsgraph);
   View3D *v3d = CTX_wm_view3d(C);
-  Object *ob_act_eval = OBACT(view_layer_eval);
+  BKE_view_layer_synced_ensure(scene_eval, view_layer_eval);
+  Object *ob_act_eval = BKE_view_layer_active_object_get(view_layer_eval);
   Object *ob_act = DEG_get_original_object(ob_act_eval);
 
   if (ob_act && (ob_act->mode & OB_MODE_ALL_PAINT) &&
@@ -203,12 +205,11 @@ bool view3d_orbit_calc_center(bContext *C, float r_dyn_ofs[3])
   }
   else if (ob_act == NULL || ob_act->mode == OB_MODE_OBJECT) {
     /* object mode use boundbox centers */
-    Base *base_eval;
     uint tot = 0;
     float select_center[3];
 
     zero_v3(select_center);
-    for (base_eval = FIRSTBASE(view_layer_eval); base_eval; base_eval = base_eval->next) {
+    LISTBASE_FOREACH (Base *, base_eval, BKE_view_layer_object_bases_get(view_layer_eval)) {
       if (BASE_SELECTED(v3d, base_eval)) {
         /* use the boundbox if we can */
         Object *ob_eval = base_eval->object;
@@ -495,6 +496,8 @@ static void axis_set_view(bContext *C,
                               .camera_old = v3d->camera,
                               .ofs = rv3d->ofs,
                               .quat = quat,
+                              /* No undo because this switches to/from camera. */
+                              .undo_str = NULL,
                           });
   }
   else if (orig_persp == RV3D_CAMOB && v3d->camera) {
@@ -518,6 +521,8 @@ static void axis_set_view(bContext *C,
                               .ofs = ofs,
                               .quat = quat,
                               .dist = &dist,
+                              /* No undo because this switches to/from camera. */
+                              .undo_str = NULL,
                           });
   }
   else {
@@ -540,6 +545,8 @@ static void axis_set_view(bContext *C,
                           &(const V3D_SmoothParams){
                               .quat = quat,
                               .dyn_ofs = dyn_ofs_pt,
+                              /* No undo because this isn't a camera view. */
+                              .undo_str = NULL,
                           });
   }
 }
@@ -694,6 +701,8 @@ static void view3d_from_minmax(bContext *C,
                               .camera_old = v3d->camera,
                               .ofs = new_ofs,
                               .dist = ok_dist ? &new_dist : NULL,
+                              /* The caller needs to use undo begin/end calls. */
+                              .undo_str = NULL,
                           });
   }
   else {
@@ -704,6 +713,8 @@ static void view3d_from_minmax(bContext *C,
                           &(const V3D_SmoothParams){
                               .ofs = new_ofs,
                               .dist = ok_dist ? &new_dist : NULL,
+                              /* The caller needs to use undo begin/end calls. */
+                              .undo_str = NULL,
                           });
   }
 
@@ -736,13 +747,15 @@ static void view3d_from_minmax_multi(bContext *C,
 
 static int view3d_all_exec(bContext *C, wmOperator *op)
 {
+  ScrArea *area = CTX_wm_area(C);
   ARegion *region = CTX_wm_region(C);
   View3D *v3d = CTX_wm_view3d(C);
   RegionView3D *rv3d = CTX_wm_region_view3d(C);
   Scene *scene = CTX_data_scene(C);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
   ViewLayer *view_layer_eval = DEG_get_evaluated_view_layer(depsgraph);
-  Base *base_eval;
+
   const bool use_all_regions = RNA_boolean_get(op->ptr, "use_all_regions");
   const bool skip_camera = (ED_view3d_camera_lock_check(v3d, region->regiondata) ||
                             /* any one of the regions may be locked */
@@ -767,7 +780,8 @@ static int view3d_all_exec(bContext *C, wmOperator *op)
     INIT_MINMAX(min, max);
   }
 
-  for (base_eval = view_layer_eval->object_bases.first; base_eval; base_eval = base_eval->next) {
+  BKE_view_layer_synced_ensure(scene_eval, view_layer_eval);
+  LISTBASE_FOREACH (Base *, base_eval, BKE_view_layer_object_bases_get(view_layer_eval)) {
     if (BASE_VISIBLE(v3d, base_eval)) {
       bool only_center = false;
       Object *ob = DEG_get_original_object(base_eval->object);
@@ -802,6 +816,7 @@ static int view3d_all_exec(bContext *C, wmOperator *op)
     /* This is an approximation, see function documentation for details. */
     ED_view3d_clipping_clamp_minmax(rv3d, min, max);
   }
+  ED_view3d_smooth_view_undo_begin(C, area);
 
   if (use_all_regions) {
     view3d_from_minmax_multi(C, v3d, min, max, true, smooth_viewtx);
@@ -810,6 +825,8 @@ static int view3d_all_exec(bContext *C, wmOperator *op)
     view3d_from_minmax(C, v3d, region, min, max, true, smooth_viewtx);
   }
 
+  ED_view3d_smooth_view_undo_end(C, area, op->type->name, false);
+
   return OPERATOR_FINISHED;
 }
 
@@ -842,13 +859,16 @@ void VIEW3D_OT_view_all(wmOperatorType *ot)
 
 static int viewselected_exec(bContext *C, wmOperator *op)
 {
+  ScrArea *area = CTX_wm_area(C);
   ARegion *region = CTX_wm_region(C);
   View3D *v3d = CTX_wm_view3d(C);
   RegionView3D *rv3d = CTX_wm_region_view3d(C);
   Scene *scene = CTX_data_scene(C);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  const Scene *scene_eval = DEG_get_evaluated_scene(depsgraph);
   ViewLayer *view_layer_eval = DEG_get_evaluated_view_layer(depsgraph);
-  Object *ob_eval = OBACT(view_layer_eval);
+  BKE_view_layer_synced_ensure(scene_eval, view_layer_eval);
+  Object *ob_eval = BKE_view_layer_active_object_get(view_layer_eval);
   Object *obedit = CTX_data_edit_object(C);
   const bGPdata *gpd_eval = ob_eval && (ob_eval->type == OB_GPENCIL) ? ob_eval->data : NULL;
   const bool is_gp_edit = gpd_eval ? GPENCIL_ANY_MODE(gpd_eval) : false;
@@ -872,7 +892,8 @@ static int viewselected_exec(bContext *C, wmOperator *op)
     /* this is weak code this way, we should make a generic
      * active/selection callback interface once... */
     Base *base_eval;
-    for (base_eval = view_layer_eval->object_bases.first; base_eval; base_eval = base_eval->next) {
+    for (base_eval = BKE_view_layer_object_bases_get(view_layer_eval)->first; base_eval;
+         base_eval = base_eval->next) {
       if (BASE_SELECTED_EDITABLE(v3d, base_eval)) {
         if (base_eval->object->type == OB_ARMATURE) {
           if (base_eval->object->mode & OB_MODE_POSE) {
@@ -922,14 +943,15 @@ static int viewselected_exec(bContext *C, wmOperator *op)
   }
   else if (obedit) {
     /* only selected */
-    FOREACH_OBJECT_IN_MODE_BEGIN (view_layer_eval, v3d, obedit->type, obedit->mode, ob_eval_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (
+        scene_eval, view_layer_eval, v3d, obedit->type, obedit->mode, ob_eval_iter) {
       ok |= ED_view3d_minmax_verts(ob_eval_iter, min, max);
     }
     FOREACH_OBJECT_IN_MODE_END;
   }
   else if (ob_eval && (ob_eval->mode & OB_MODE_POSE)) {
     FOREACH_OBJECT_IN_MODE_BEGIN (
-        view_layer_eval, v3d, ob_eval->type, ob_eval->mode, ob_eval_iter) {
+        scene_eval, view_layer_eval, v3d, ob_eval->type, ob_eval->mode, ob_eval_iter) {
       ok |= BKE_pose_minmax(ob_eval_iter, min, max, true, true);
     }
     FOREACH_OBJECT_IN_MODE_END;
@@ -948,8 +970,7 @@ static int viewselected_exec(bContext *C, wmOperator *op)
     ok_dist = 0; /* don't zoom */
   }
   else {
-    Base *base_eval;
-    for (base_eval = FIRSTBASE(view_layer_eval); base_eval; base_eval = base_eval->next) {
+    LISTBASE_FOREACH (Base *, base_eval, BKE_view_layer_object_bases_get(view_layer_eval)) {
       if (BASE_SELECTED(v3d, base_eval)) {
         bool only_center = false;
         Object *ob = DEG_get_original_object(base_eval->object);
@@ -971,6 +992,8 @@ static int viewselected_exec(bContext *C, wmOperator *op)
     ED_view3d_clipping_clamp_minmax(rv3d, min, max);
   }
 
+  ED_view3d_smooth_view_undo_begin(C, area);
+
   if (use_all_regions) {
     view3d_from_minmax_multi(C, v3d, min, max, ok_dist, smooth_viewtx);
   }
@@ -978,6 +1001,8 @@ static int viewselected_exec(bContext *C, wmOperator *op)
     view3d_from_minmax(C, v3d, region, min, max, ok_dist, smooth_viewtx);
   }
 
+  ED_view3d_smooth_view_undo_end(C, area, op->type->name, false);
+
   return OPERATOR_FINISHED;
 }
 
@@ -1020,8 +1045,14 @@ static int viewcenter_cursor_exec(bContext *C, wmOperator *op)
     /* non camera center */
     float new_ofs[3];
     negate_v3_v3(new_ofs, scene->cursor.location);
-    ED_view3d_smooth_view(
-        C, v3d, region, smooth_viewtx, &(const V3D_SmoothParams){.ofs = new_ofs});
+    ED_view3d_smooth_view(C,
+                          v3d,
+                          region,
+                          smooth_viewtx,
+                          &(const V3D_SmoothParams){
+                              .ofs = new_ofs,
+                              .undo_str = op->type->name,
+                          });
 
     /* Smooth view does view-lock #RV3D_BOXVIEW copy. */
   }
@@ -1074,8 +1105,14 @@ static int viewcenter_pick_invoke(bContext *C, wmOperator *op, const wmEvent *ev
       ED_view3d_win_to_3d_int(v3d, region, new_ofs, event->mval, new_ofs);
     }
     negate_v3(new_ofs);
-    ED_view3d_smooth_view(
-        C, v3d, region, smooth_viewtx, &(const V3D_SmoothParams){.ofs = new_ofs});
+    ED_view3d_smooth_view(C,
+                          v3d,
+                          region,
+                          smooth_viewtx,
+                          &(const V3D_SmoothParams){
+                              .ofs = new_ofs,
+                              .undo_str = op->type->name,
+                          });
   }
 
   return OPERATOR_FINISHED;
@@ -1138,10 +1175,12 @@ static int view_axis_exec(bContext *C, wmOperator *op)
     Object *obact = CTX_data_active_object(C);
     if (obact != NULL) {
       float twmat[3][3];
+      const Scene *scene = CTX_data_scene(C);
       struct ViewLayer *view_layer = CTX_data_view_layer(C);
       Object *obedit = CTX_data_edit_object(C);
       /* same as transform gizmo when normal is set */
-      ED_getTransformOrientationMatrix(view_layer, v3d, obact, obedit, V3D_AROUND_ACTIVE, twmat);
+      ED_getTransformOrientationMatrix(
+          scene, view_layer, v3d, obact, obedit, V3D_AROUND_ACTIVE, twmat);
       align_quat = align_quat_buf;
       mat3_to_quat(align_quat, twmat);
       invert_qt_normalized(align_quat);
@@ -1275,7 +1314,8 @@ static int view_camera_exec(bContext *C, wmOperator *op)
     Scene *scene = CTX_data_scene(C);
 
     if (rv3d->persp != RV3D_CAMOB) {
-      Object *ob = OBACT(view_layer);
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      Object *ob = BKE_view_layer_active_object_get(view_layer);
 
       if (!rv3d->smooth_timer) {
         /* store settings of current view before allowing overwriting with camera view
@@ -1302,7 +1342,7 @@ static int view_camera_exec(bContext *C, wmOperator *op)
       }
 
       if (v3d->camera == NULL) {
-        v3d->camera = BKE_view_layer_camera_find(view_layer);
+        v3d->camera = BKE_view_layer_camera_find(scene, view_layer);
       }
 
       /* couldn't find any useful camera, bail out */
@@ -1318,17 +1358,20 @@ static int view_camera_exec(bContext *C, wmOperator *op)
 
       /* finally do snazzy view zooming */
       rv3d->persp = RV3D_CAMOB;
-      ED_view3d_smooth_view(C,
-                            v3d,
-                            region,
-                            smooth_viewtx,
-                            &(const V3D_SmoothParams){
-                                .camera = v3d->camera,
-                                .ofs = rv3d->ofs,
-                                .quat = rv3d->viewquat,
-                                .dist = &rv3d->dist,
-                                .lens = &v3d->lens,
-                            });
+      ED_view3d_smooth_view(
+          C,
+          v3d,
+          region,
+          smooth_viewtx,
+          &(const V3D_SmoothParams){
+              .camera = v3d->camera,
+              .ofs = rv3d->ofs,
+              .quat = rv3d->viewquat,
+              .dist = &rv3d->dist,
+              .lens = &v3d->lens,
+              /* No undo because this changes cameras (and wont move the camera). */
+              .undo_str = NULL,
+          });
     }
     else {
       /* return to settings of last view */
@@ -1417,7 +1460,12 @@ static int vieworbit_exec(bContext *C, wmOperator *op)
   ED_view3d_smooth_view_force_finish(C, v3d, region);
 
   if ((RV3D_LOCK_FLAGS(rv3d) & RV3D_LOCK_ROTATION) == 0 || (view_opposite != RV3D_VIEW_USER)) {
-    if ((rv3d->persp != RV3D_CAMOB) || ED_view3d_camera_lock_check(v3d, rv3d)) {
+    const bool is_camera_lock = ED_view3d_camera_lock_check(v3d, rv3d);
+    if ((rv3d->persp != RV3D_CAMOB) || is_camera_lock) {
+      if (is_camera_lock) {
+        const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+        ED_view3d_camera_lock_init(depsgraph, v3d, rv3d);
+      }
       int smooth_viewtx = WM_operator_smooth_viewtx_get(op);
       float quat_mul[4];
       float quat_new[4];
@@ -1475,6 +1523,9 @@ static int vieworbit_exec(bContext *C, wmOperator *op)
                             &(const V3D_SmoothParams){
                                 .quat = quat_new,
                                 .dyn_ofs = dyn_ofs_pt,
+                                /* Group as successive orbit may run by holding a key. */
+                                .undo_str = op->type->name,
+                                .undo_grouped = true,
                             });
 
       return OPERATOR_FINISHED;
@@ -1554,6 +1605,7 @@ static int viewpan_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 
   viewmove_apply(vod, vod->prev.event_xy[0] + x, vod->prev.event_xy[1] + y);
 
+  ED_view3d_camera_lock_undo_push(op->type->name, vod->v3d, vod->rv3d, C);
   viewops_data_free(C, vod);
 
   return OPERATOR_FINISHED;
diff --git a/source/blender/editors/space_view3d/view3d_navigate.h b/source/blender/editors/space_view3d/view3d_navigate.h
index fc7bc11295a..925acd90573 100644
--- a/source/blender/editors/space_view3d/view3d_navigate.h
+++ b/source/blender/editors/space_view3d/view3d_navigate.h
@@ -231,6 +231,14 @@ typedef struct V3D_SmoothParams {
 
   /** Alternate rotation center, when set `ofs` must be NULL. */
   const float *dyn_ofs;
+
+  /** When non-NULL, perform undo pushes when transforming the camera. */
+  const char *undo_str;
+  /**
+   * When true use grouped undo pushes, use for incremental viewport manipulation
+   * which are likely to be activated by holding a key or from the mouse-wheel.
+   */
+  bool undo_grouped;
 } V3D_SmoothParams;
 
 /**
@@ -252,6 +260,22 @@ void ED_view3d_smooth_view(struct bContext *C,
                            const V3D_SmoothParams *sview);
 
 /**
+ * Call before multiple smooth-view operations begin to properly handle undo.
+ *
+ * \note Only use explicit undo calls when multiple calls to smooth-view are necessary
+ * or when calling #ED_view3d_smooth_view_ex.
+ * Otherwise pass in #V3D_SmoothParams.undo_str so an undo step is pushed as needed.
+ */
+void ED_view3d_smooth_view_undo_begin(struct bContext *C, const struct ScrArea *area);
+/**
+ * Run after multiple smooth-view operations have run to push undo as needed.
+ */
+void ED_view3d_smooth_view_undo_end(struct bContext *C,
+                                    const struct ScrArea *area,
+                                    const char *undo_str,
+                                    bool undo_grouped);
+
+/**
  * Apply the smooth-view immediately, use when we need to start a new view operation.
  * (so we don't end up half-applying a view operation when pressing keys quickly).
  */
diff --git a/source/blender/editors/space_view3d/view3d_navigate_dolly.c b/source/blender/editors/space_view3d/view3d_navigate_dolly.c
index d45b0c436ac..df0f4e6e94b 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_dolly.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_dolly.c
@@ -41,7 +41,7 @@ void viewdolly_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Dolly Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -181,6 +181,7 @@ static int viewdolly_modal(bContext *C, wmOperator *op, const wmEvent *event)
   }
 
   if (ret & OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, vod->v3d, vod->rv3d, C);
     viewops_data_free(C, vod);
     op->customdata = NULL;
   }
diff --git a/source/blender/editors/space_view3d/view3d_navigate_fly.c b/source/blender/editors/space_view3d/view3d_navigate_fly.c
index 399f422f411..3e83f8085c7 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_fly.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_fly.c
@@ -122,7 +122,7 @@ void fly_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Fly Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -247,7 +247,7 @@ static void drawFlyPixel(const struct bContext *UNUSED(C), ARegion *UNUSED(regio
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColor3(TH_VIEW_OVERLAY);
 
@@ -1079,6 +1079,7 @@ static int fly_modal(bContext *C, wmOperator *op, const wmEvent *event)
   int exit_code;
   bool do_draw = false;
   FlyInfo *fly = op->customdata;
+  View3D *v3d = fly->v3d;
   RegionView3D *rv3d = fly->rv3d;
   Object *fly_object = ED_view3d_cameracontrol_object_get(fly->v3d_camera_control);
 
@@ -1102,6 +1103,9 @@ static int fly_modal(bContext *C, wmOperator *op, const wmEvent *event)
 
   exit_code = flyEnd(C, fly);
 
+  if (exit_code == OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, v3d, rv3d, C);
+  }
   if (exit_code != OPERATOR_RUNNING_MODAL) {
     do_draw = true;
   }
diff --git a/source/blender/editors/space_view3d/view3d_navigate_move.c b/source/blender/editors/space_view3d/view3d_navigate_move.c
index e653b349a2f..9de0a2ae4c2 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_move.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_move.c
@@ -35,7 +35,7 @@ void viewmove_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Move Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -140,6 +140,7 @@ static int viewmove_modal(bContext *C, wmOperator *op, const wmEvent *event)
   }
 
   if (ret & OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, vod->v3d, vod->rv3d, C);
     viewops_data_free(C, op->customdata);
     op->customdata = NULL;
   }
diff --git a/source/blender/editors/space_view3d/view3d_navigate_ndof.c b/source/blender/editors/space_view3d/view3d_navigate_ndof.c
index 1ce9bdcb211..88abf602c26 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_ndof.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_ndof.c
@@ -373,6 +373,9 @@ static int view3d_ndof_cameraview_pan_zoom(bContext *C, const wmEvent *event)
   const bool has_translate = !is_zero_v2(ndof->tvec);
   const bool has_zoom = ndof->tvec[2] != 0.0f;
 
+  float pan_vec[3];
+  WM_event_ndof_pan_get(ndof, pan_vec, true);
+
   /* NOTE(@campbellbarton): In principle rotating could pass through to regular
    * non-camera NDOF behavior (exiting the camera-view and rotating).
    * Disabled this block since in practice it's difficult to control NDOF devices
@@ -388,14 +391,14 @@ static int view3d_ndof_cameraview_pan_zoom(bContext *C, const wmEvent *event)
 
   if (has_translate) {
     const float speed = ndof->dt * NDOF_PIXELS_PER_SECOND;
-    float event_ofs[2] = {ndof->tvec[0] * speed, ndof->tvec[1] * speed};
+    float event_ofs[2] = {pan_vec[0] * speed, pan_vec[1] * speed};
     if (ED_view3d_camera_view_pan(region, event_ofs)) {
       changed = true;
     }
   }
 
   if (has_zoom) {
-    const float scale = 1.0f + (ndof->dt * ndof->tvec[2]);
+    const float scale = 1.0f + (ndof->dt * pan_vec[2]);
     if (ED_view3d_camera_view_zoom_scale(rv3d, scale)) {
       changed = true;
     }
diff --git a/source/blender/editors/space_view3d/view3d_navigate_roll.c b/source/blender/editors/space_view3d/view3d_navigate_roll.c
index 087ca72211e..af93aa50238 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_roll.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_roll.c
@@ -15,6 +15,8 @@
 #include "RNA_access.h"
 #include "RNA_define.h"
 
+#include "DEG_depsgraph_query.h"
+
 #include "ED_screen.h"
 
 #include "view3d_intern.h"
@@ -167,7 +169,13 @@ static int viewroll_exec(bContext *C, wmOperator *op)
   }
 
   rv3d = region->regiondata;
-  if ((rv3d->persp != RV3D_CAMOB) || ED_view3d_camera_lock_check(v3d, rv3d)) {
+
+  const bool is_camera_lock = ED_view3d_camera_lock_check(v3d, rv3d);
+  if ((rv3d->persp != RV3D_CAMOB) || is_camera_lock) {
+    if (is_camera_lock) {
+      const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+      ED_view3d_camera_lock_init(depsgraph, v3d, rv3d);
+    }
 
     ED_view3d_smooth_view_force_finish(C, v3d, region);
 
@@ -202,6 +210,9 @@ static int viewroll_exec(bContext *C, wmOperator *op)
                           &(const V3D_SmoothParams){
                               .quat = quat_new,
                               .dyn_ofs = dyn_ofs_pt,
+                              /* Group as successive roll may run by holding a key. */
+                              .undo_str = op->type->name,
+                              .undo_grouped = true,
                           });
 
     viewops_data_free(C, op->customdata);
diff --git a/source/blender/editors/space_view3d/view3d_navigate_rotate.c b/source/blender/editors/space_view3d/view3d_navigate_rotate.c
index 989fa152acc..10adf238001 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_rotate.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_rotate.c
@@ -37,7 +37,7 @@ void viewrotate_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Rotate Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -375,6 +375,7 @@ static int viewrotate_modal(bContext *C, wmOperator *op, const wmEvent *event)
   }
 
   if (ret & OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, vod->v3d, vod->rv3d, C);
     viewops_data_free(C, op->customdata);
     op->customdata = NULL;
   }
diff --git a/source/blender/editors/space_view3d/view3d_navigate_smoothview.c b/source/blender/editors/space_view3d/view3d_navigate_smoothview.c
index 48af126d8a9..6b150d1e771 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_smoothview.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_smoothview.c
@@ -8,6 +8,7 @@
 
 #include "MEM_guardedalloc.h"
 
+#include "BLI_listbase.h"
 #include "BLI_math.h"
 
 #include "BKE_context.h"
@@ -21,6 +22,115 @@
 #include "view3d_intern.h"
 #include "view3d_navigate.h" /* own include */
 
+static void view3d_smoothview_apply_with_interp(
+    bContext *C, View3D *v3d, RegionView3D *rv3d, const bool use_autokey, const float factor);
+
+/* -------------------------------------------------------------------- */
+/** \name Smooth View Undo Handling
+ *
+ * When the camera is locked to the viewport smooth-view operations
+ * may need to perform an undo push.
+ *
+ * In this case the smooth-view camera transformation is temporarily completed,
+ * undo is pushed then the change is rewound, and smooth-view completes from it's timer.
+ * In the case smooth-view executed the change immediately - an undo push is called.
+ *
+ * NOTE(@campbellbarton): While this is not ideal it's necessary as making the undo-push
+ * once smooth-view is complete because smooth-view is non-blocking and it's possible other
+ * operations are executed once smooth-view has started.
+ * \{ */
+
+void ED_view3d_smooth_view_undo_begin(bContext *C, const ScrArea *area)
+{
+  const View3D *v3d = area->spacedata.first;
+  Object *camera = v3d->camera;
+  if (!camera) {
+    return;
+  }
+
+  /* Tag the camera object so it's known smooth-view is applied to the view-ports camera
+   * (needed to detect when a locked camera is being manipulated).
+   * NOTE: It doesn't matter if the actual object being manipulated is the camera or not. */
+  camera->id.tag &= ~LIB_TAG_DOIT;
+
+  LISTBASE_FOREACH (const ARegion *, region, &area->regionbase) {
+    if (region->regiontype != RGN_TYPE_WINDOW) {
+      continue;
+    }
+    const RegionView3D *rv3d = region->regiondata;
+    if (ED_view3d_camera_lock_undo_test(v3d, rv3d, C)) {
+      camera->id.tag |= LIB_TAG_DOIT;
+      break;
+    }
+  }
+}
+
+void ED_view3d_smooth_view_undo_end(bContext *C,
+                                    const ScrArea *area,
+                                    const char *undo_str,
+                                    const bool undo_grouped)
+{
+  View3D *v3d = area->spacedata.first;
+  Object *camera = v3d->camera;
+  if (!camera) {
+    return;
+  }
+  if (camera->id.tag & LIB_TAG_DOIT) {
+    /* Smooth view didn't touch the camera. */
+    camera->id.tag &= ~LIB_TAG_DOIT;
+    return;
+  }
+
+  if ((U.uiflag & USER_GLOBALUNDO) == 0) {
+    return;
+  }
+
+  /* NOTE(@campbellbarton): It is not possible that a single viewport references different cameras
+   * so even in the case there is a quad-view with multiple camera views set, these will all
+   * reference the same camera. In this case it doesn't matter which region is used.
+   * If in the future multiple cameras are supported, this logic can be extended. */
+  const ARegion *region_camera = NULL;
+
+  /* An undo push should be performed. */
+  bool is_interactive = false;
+  LISTBASE_FOREACH (const ARegion *, region, &area->regionbase) {
+    if (region->regiontype != RGN_TYPE_WINDOW) {
+      continue;
+    }
+    const RegionView3D *rv3d = region->regiondata;
+    if (ED_view3d_camera_lock_undo_test(v3d, rv3d, C)) {
+      region_camera = region;
+      if (rv3d->sms) {
+        is_interactive = true;
+      }
+    }
+  }
+
+  if (region_camera == NULL) {
+    return;
+  }
+
+  RegionView3D *rv3d = region_camera->regiondata;
+
+  /* Fast forward, undo push, then rewind. */
+  if (is_interactive) {
+    view3d_smoothview_apply_with_interp(C, v3d, rv3d, false, 1.0f);
+  }
+
+  if (undo_grouped) {
+    ED_view3d_camera_lock_undo_grouped_push(undo_str, v3d, rv3d, C);
+  }
+  else {
+    ED_view3d_camera_lock_undo_push(undo_str, v3d, rv3d, C);
+  }
+
+  if (is_interactive) {
+    view3d_smoothview_apply_with_interp(C, v3d, rv3d, false, 0.0f);
+  }
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Smooth View Operator & Utilities
  *
@@ -86,6 +196,11 @@ void ED_view3d_smooth_view_ex(
     const int smooth_viewtx,
     const V3D_SmoothParams *sview)
 {
+  /* In this case use #ED_view3d_smooth_view_undo_begin & end functions
+   * instead of passing in undo. */
+  BLI_assert_msg(sview->undo_str == NULL,
+                 "Only the 'ED_view3d_smooth_view' version of this function handles undo!");
+
   RegionView3D *rv3d = region->regiondata;
   struct SmoothView3DStore sms = {{0}};
 
@@ -236,6 +351,13 @@ void ED_view3d_smooth_view_ex(
 
     WM_event_add_mousemove(win);
   }
+
+  if (sms.to_camera == false) {
+    /* See comments in #ED_view3d_smooth_view_undo_begin for why this is needed. */
+    if (v3d->camera) {
+      v3d->camera->id.tag &= ~LIB_TAG_DOIT;
+    }
+  }
 }
 
 void ED_view3d_smooth_view(bContext *C,
@@ -249,97 +371,129 @@ void ED_view3d_smooth_view(bContext *C,
   wmWindow *win = CTX_wm_window(C);
   ScrArea *area = CTX_wm_area(C);
 
-  ED_view3d_smooth_view_ex(depsgraph, wm, win, area, v3d, region, smooth_viewtx, sview);
+  /* #ED_view3d_smooth_view_ex asserts this is not set as it doesn't support undo. */
+  struct V3D_SmoothParams sview_no_undo = *sview;
+  sview_no_undo.undo_str = NULL;
+  sview_no_undo.undo_grouped = false;
+
+  const bool do_undo = (sview->undo_str != NULL);
+  if (do_undo) {
+    ED_view3d_smooth_view_undo_begin(C, area);
+  }
+
+  ED_view3d_smooth_view_ex(depsgraph, wm, win, area, v3d, region, smooth_viewtx, &sview_no_undo);
+
+  if (do_undo) {
+    ED_view3d_smooth_view_undo_end(C, area, sview->undo_str, sview->undo_grouped);
+  }
 }
 
-/* only meant for timer usage */
-static void view3d_smoothview_apply(bContext *C, View3D *v3d, ARegion *region, bool sync_boxview)
+/**
+ * Apply with interpolation, on completion run #view3d_smoothview_apply_and_finish.
+ */
+static void view3d_smoothview_apply_with_interp(
+    bContext *C, View3D *v3d, RegionView3D *rv3d, const bool use_autokey, const float factor)
 {
-  wmWindowManager *wm = CTX_wm_manager(C);
-  RegionView3D *rv3d = region->regiondata;
   struct SmoothView3DStore *sms = rv3d->sms;
-  float step, step_inv;
 
-  if (sms->time_allowed != 0.0) {
-    step = (float)((rv3d->smooth_timer->duration) / sms->time_allowed);
+  interp_qt_qtqt(rv3d->viewquat, sms->src.quat, sms->dst.quat, factor);
+
+  if (sms->use_dyn_ofs) {
+    view3d_orbit_apply_dyn_ofs(
+        rv3d->ofs, sms->src.ofs, sms->src.quat, rv3d->viewquat, sms->dyn_ofs);
   }
   else {
-    step = 1.0f;
+    interp_v3_v3v3(rv3d->ofs, sms->src.ofs, sms->dst.ofs, factor);
   }
 
-  /* end timer */
-  if (step >= 1.0f) {
-    wmWindow *win = CTX_wm_window(C);
+  rv3d->dist = interpf(sms->dst.dist, sms->src.dist, factor);
+  v3d->lens = interpf(sms->dst.lens, sms->src.lens, factor);
 
-    /* if we went to camera, store the original */
-    if (sms->to_camera) {
-      rv3d->persp = RV3D_CAMOB;
-      view3d_smooth_view_state_restore(&sms->org, v3d, rv3d);
-    }
-    else {
-      const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
-
-      view3d_smooth_view_state_restore(&sms->dst, v3d, rv3d);
-
-      ED_view3d_camera_lock_sync(depsgraph, v3d, rv3d);
+  const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  if (ED_view3d_camera_lock_sync(depsgraph, v3d, rv3d)) {
+    if (use_autokey) {
       ED_view3d_camera_lock_autokey(v3d, rv3d, C, true, true);
     }
+  }
+}
 
-    if ((RV3D_LOCK_FLAGS(rv3d) & RV3D_LOCK_ROTATION) == 0) {
-      rv3d->view = sms->org_view;
-    }
-
-    MEM_freeN(rv3d->sms);
-    rv3d->sms = NULL;
+/**
+ * Apply the view-port transformation & free smooth-view related data.
+ */
+static void view3d_smoothview_apply_and_finish(bContext *C, View3D *v3d, RegionView3D *rv3d)
+{
+  wmWindowManager *wm = CTX_wm_manager(C);
+  struct SmoothView3DStore *sms = rv3d->sms;
 
-    WM_event_remove_timer(wm, win, rv3d->smooth_timer);
-    rv3d->smooth_timer = NULL;
-    rv3d->rflag &= ~RV3D_NAVIGATING;
+  wmWindow *win = CTX_wm_window(C);
 
-    /* Event handling won't know if a UI item has been moved under the pointer. */
-    WM_event_add_mousemove(win);
+  /* if we went to camera, store the original */
+  if (sms->to_camera) {
+    rv3d->persp = RV3D_CAMOB;
+    view3d_smooth_view_state_restore(&sms->org, v3d, rv3d);
   }
   else {
-    /* ease in/out */
-    step = (3.0f * step * step - 2.0f * step * step * step);
-
-    step_inv = 1.0f - step;
-
-    interp_qt_qtqt(rv3d->viewquat, sms->src.quat, sms->dst.quat, step);
-
-    if (sms->use_dyn_ofs) {
-      view3d_orbit_apply_dyn_ofs(
-          rv3d->ofs, sms->src.ofs, sms->src.quat, rv3d->viewquat, sms->dyn_ofs);
-    }
-    else {
-      interp_v3_v3v3(rv3d->ofs, sms->src.ofs, sms->dst.ofs, step);
-    }
+    const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
 
-    rv3d->dist = sms->dst.dist * step + sms->src.dist * step_inv;
-    v3d->lens = sms->dst.lens * step + sms->src.lens * step_inv;
+    view3d_smooth_view_state_restore(&sms->dst, v3d, rv3d);
 
-    const Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
-    ED_view3d_camera_lock_sync(depsgraph, v3d, rv3d);
-    if (ED_screen_animation_playing(wm)) {
+    if (ED_view3d_camera_lock_sync(depsgraph, v3d, rv3d)) {
       ED_view3d_camera_lock_autokey(v3d, rv3d, C, true, true);
     }
   }
 
-  if (sync_boxview && (RV3D_LOCK_FLAGS(rv3d) & RV3D_BOXVIEW)) {
-    view3d_boxview_copy(CTX_wm_area(C), region);
+  if ((RV3D_LOCK_FLAGS(rv3d) & RV3D_LOCK_ROTATION) == 0) {
+    rv3d->view = sms->org_view;
   }
 
+  MEM_freeN(rv3d->sms);
+  rv3d->sms = NULL;
+
+  WM_event_remove_timer(wm, win, rv3d->smooth_timer);
+  rv3d->smooth_timer = NULL;
+  rv3d->rflag &= ~RV3D_NAVIGATING;
+
+  /* Event handling won't know if a UI item has been moved under the pointer. */
+  WM_event_add_mousemove(win);
+
   /* NOTE: this doesn't work right because the v3d->lens is now used in ortho mode r51636,
    * when switching camera in quad-view the other ortho views would zoom & reset.
    *
    * For now only redraw all regions when smooth-view finishes.
    */
-  if (step >= 1.0f) {
-    WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, v3d);
+  WM_event_add_notifier(C, NC_SPACE | ND_SPACE_VIEW3D, v3d);
+}
+
+/* only meant for timer usage */
+
+static void view3d_smoothview_apply_from_timer(bContext *C, View3D *v3d, ARegion *region)
+{
+  wmWindowManager *wm = CTX_wm_manager(C);
+  RegionView3D *rv3d = region->regiondata;
+  struct SmoothView3DStore *sms = rv3d->sms;
+  float factor;
+
+  if (sms->time_allowed != 0.0) {
+    factor = (float)((rv3d->smooth_timer->duration) / sms->time_allowed);
   }
   else {
-    ED_region_tag_redraw(region);
+    factor = 1.0f;
+  }
+  if (factor >= 1.0f) {
+    view3d_smoothview_apply_and_finish(C, v3d, rv3d);
   }
+  else {
+    /* Ease in/out smoothing. */
+    factor = (3.0f * factor * factor - 2.0f * factor * factor * factor);
+    const bool use_autokey = ED_screen_animation_playing(wm);
+    view3d_smoothview_apply_with_interp(C, v3d, rv3d, use_autokey, factor);
+  }
+
+  if (RV3D_LOCK_FLAGS(rv3d) & RV3D_BOXVIEW) {
+    view3d_boxview_copy(CTX_wm_area(C), region);
+  }
+
+  ED_region_tag_redraw(region);
 }
 
 static int view3d_smoothview_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
@@ -353,7 +507,7 @@ static int view3d_smoothview_invoke(bContext *C, wmOperator *UNUSED(op), const w
     return OPERATOR_PASS_THROUGH;
   }
 
-  view3d_smoothview_apply(C, v3d, region, true);
+  view3d_smoothview_apply_from_timer(C, v3d, region);
 
   return OPERATOR_FINISHED;
 }
@@ -361,12 +515,10 @@ static int view3d_smoothview_invoke(bContext *C, wmOperator *UNUSED(op), const w
 void ED_view3d_smooth_view_force_finish(bContext *C, View3D *v3d, ARegion *region)
 {
   RegionView3D *rv3d = region->regiondata;
-
   if (rv3d && rv3d->sms) {
-    rv3d->sms->time_allowed = 0.0; /* force finishing */
-    view3d_smoothview_apply(C, v3d, region, false);
+    view3d_smoothview_apply_and_finish(C, v3d, rv3d);
 
-    /* force update of view matrix so tools that run immediately after
+    /* Force update of view matrix so tools that run immediately after
      * can use them without redrawing first */
     Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
     Scene *scene = CTX_data_scene(C);
diff --git a/source/blender/editors/space_view3d/view3d_navigate_walk.c b/source/blender/editors/space_view3d/view3d_navigate_walk.c
index 471231b5f27..3e0ce892b5a 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_walk.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_walk.c
@@ -170,7 +170,7 @@ void walk_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Walk Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -335,7 +335,7 @@ static void drawWalkPixel(const struct bContext *UNUSED(C), ARegion *region, voi
   GPUVertFormat *format = immVertexFormat();
   uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_I32, 2, GPU_FETCH_INT_TO_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
   immUniformThemeColorAlpha(TH_VIEW_OVERLAY, 1.0f);
 
@@ -659,7 +659,7 @@ static void walkEvent(WalkInfo *walk, const wmEvent *event)
   if (event->type == TIMER && event->customdata == walk->timer) {
     walk->redraw = true;
   }
-  else if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  else if (ISMOUSE_MOTION(event->type)) {
 
 #ifdef USE_TABLET_SUPPORT
     if ((walk->is_cursor_absolute == false) && event->tablet.is_motion_absolute) {
@@ -1386,6 +1386,7 @@ static int walk_modal(bContext *C, wmOperator *op, const wmEvent *event)
   int exit_code;
   bool do_draw = false;
   WalkInfo *walk = op->customdata;
+  View3D *v3d = walk->v3d;
   RegionView3D *rv3d = walk->rv3d;
   Object *walk_object = ED_view3d_cameracontrol_object_get(walk->v3d_camera_control);
 
@@ -1412,6 +1413,9 @@ static int walk_modal(bContext *C, wmOperator *op, const wmEvent *event)
   if (exit_code != OPERATOR_RUNNING_MODAL) {
     do_draw = true;
   }
+  if (exit_code == OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, v3d, rv3d, C);
+  }
 
   if (do_draw) {
     if (rv3d->persp == RV3D_CAMOB) {
diff --git a/source/blender/editors/space_view3d/view3d_navigate_zoom.c b/source/blender/editors/space_view3d/view3d_navigate_zoom.c
index a67c0850ad9..40df2b1a9c9 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_zoom.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_zoom.c
@@ -41,7 +41,7 @@ void viewzoom_modal_keymap(wmKeyConfig *keyconf)
 
   wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "View3D Zoom Modal");
 
-  /* this function is called for each spacetype, only needs to add map once */
+  /* This function is called for each space-type, only needs to add map once. */
   if (keymap && keymap->modal_items) {
     return;
   }
@@ -425,6 +425,7 @@ static int viewzoom_modal(bContext *C, wmOperator *op, const wmEvent *event)
   }
 
   if (ret & OPERATOR_FINISHED) {
+    ED_view3d_camera_lock_undo_push(op->type->name, vod->v3d, vod->rv3d, C);
     viewops_data_free(C, op->customdata);
     op->customdata = NULL;
   }
@@ -507,6 +508,7 @@ static int viewzoom_exec(bContext *C, wmOperator *op)
 
   ED_region_tag_redraw(region);
 
+  ED_view3d_camera_lock_undo_grouped_push(op->type->name, v3d, rv3d, C);
   viewops_data_free(C, op->customdata);
   op->customdata = NULL;
 
diff --git a/source/blender/editors/space_view3d/view3d_navigate_zoom_border.c b/source/blender/editors/space_view3d/view3d_navigate_zoom_border.c
index f834efe4a7b..7cafc3dfd42 100644
--- a/source/blender/editors/space_view3d/view3d_navigate_zoom_border.c
+++ b/source/blender/editors/space_view3d/view3d_navigate_zoom_border.c
@@ -159,11 +159,15 @@ static int view3d_zoom_border_exec(bContext *C, wmOperator *op)
   /* clamp after because we may have been zooming out */
   CLAMP(new_dist, dist_range[0], dist_range[1]);
 
-  /* TODO(campbell): 'is_camera_lock' not currently working well. */
   const bool is_camera_lock = ED_view3d_camera_lock_check(v3d, rv3d);
-  if ((rv3d->persp == RV3D_CAMOB) && (is_camera_lock == false)) {
+  if (rv3d->persp == RV3D_CAMOB) {
     Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
-    ED_view3d_persp_switch_from_camera(depsgraph, v3d, rv3d, RV3D_PERSP);
+    if (is_camera_lock) {
+      ED_view3d_camera_lock_init(depsgraph, v3d, rv3d);
+    }
+    else {
+      ED_view3d_persp_switch_from_camera(depsgraph, v3d, rv3d, RV3D_PERSP);
+    }
   }
 
   ED_view3d_smooth_view(C,
@@ -173,6 +177,7 @@ static int view3d_zoom_border_exec(bContext *C, wmOperator *op)
                         &(const V3D_SmoothParams){
                             .ofs = new_ofs,
                             .dist = &new_dist,
+                            .undo_str = op->type->name,
                         });
 
   if (RV3D_LOCK_FLAGS(rv3d) & RV3D_BOXVIEW) {
diff --git a/source/blender/editors/space_view3d/view3d_select.c b/source/blender/editors/space_view3d/view3d_select.cc
index 8eff9ee472f..447bf99b000 100644
--- a/source/blender/editors/space_view3d/view3d_select.c
+++ b/source/blender/editors/space_view3d/view3d_select.cc
@@ -5,10 +5,10 @@
  * \ingroup spview3d
  */
 
-#include <float.h>
-#include <math.h>
-#include <stdio.h>
-#include <string.h>
+#include <cfloat>
+#include <cmath>
+#include <cstdio>
+#include <cstring>
 
 #include "DNA_action_types.h"
 #include "DNA_armature_types.h"
@@ -23,7 +23,6 @@
 
 #include "MEM_guardedalloc.h"
 
-#include "BLI_array.h"
 #include "BLI_bitmap.h"
 #include "BLI_lasso_2d.h"
 #include "BLI_linklist.h"
@@ -32,6 +31,7 @@
 #include "BLI_rect.h"
 #include "BLI_string.h"
 #include "BLI_utildefines.h"
+#include "BLI_vector.hh"
 
 #ifdef __BIG_ENDIAN__
 #  include "BLI_endian_switch.h"
@@ -140,10 +140,11 @@ void ED_view3d_viewcontext_init_object(ViewContext *vc, Object *obact)
 /** \name Internal Object Utilities
  * \{ */
 
-static bool object_deselect_all_visible(ViewLayer *view_layer, View3D *v3d)
+static bool object_deselect_all_visible(const Scene *scene, ViewLayer *view_layer, View3D *v3d)
 {
   bool changed = false;
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->flag & BASE_SELECTED) {
       if (BASE_SELECTABLE(v3d, base)) {
         ED_object_base_select(base, BA_DESELECT);
@@ -155,10 +156,11 @@ static bool object_deselect_all_visible(ViewLayer *view_layer, View3D *v3d)
 }
 
 /* deselect all except b */
-static bool object_deselect_all_except(ViewLayer *view_layer, Base *b)
+static bool object_deselect_all_except(const Scene *scene, ViewLayer *view_layer, Base *b)
 {
   bool changed = false;
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->flag & BASE_SELECTED) {
       if (b != base) {
         ED_object_base_select(base, BA_DESELECT);
@@ -191,7 +193,7 @@ static void editselect_buf_cache_init(ViewContext *vc, short select_mode)
   if (vc->obedit) {
     uint bases_len = 0;
     Base **bases = BKE_view_layer_array_from_bases_in_edit_mode(
-        vc->view_layer, vc->v3d, &bases_len);
+        vc->scene, vc->view_layer, vc->v3d, &bases_len);
 
     DRW_select_buffer_context_create(bases, bases_len, select_mode);
     MEM_freeN(bases);
@@ -199,20 +201,21 @@ static void editselect_buf_cache_init(ViewContext *vc, short select_mode)
   else {
     /* Use for paint modes, currently only a single object at a time. */
     if (vc->obact) {
+      BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
       Base *base = BKE_view_layer_base_find(vc->view_layer, vc->obact);
       DRW_select_buffer_context_create(&base, 1, select_mode);
     }
   }
 }
 
-static void editselect_buf_cache_free(struct EditSelectBuf_Cache *esel)
+static void editselect_buf_cache_free(EditSelectBuf_Cache *esel)
 {
   MEM_SAFE_FREE(esel->select_bitmap);
 }
 
 static void editselect_buf_cache_free_voidp(void *esel_voidp)
 {
-  editselect_buf_cache_free(esel_voidp);
+  editselect_buf_cache_free(static_cast<EditSelectBuf_Cache *>(esel_voidp));
   MEM_freeN(esel_voidp);
 }
 
@@ -220,7 +223,7 @@ static void editselect_buf_cache_init_with_generic_userdata(wmGenericUserData *w
                                                             ViewContext *vc,
                                                             short select_mode)
 {
-  struct EditSelectBuf_Cache *esel = MEM_callocN(sizeof(*esel), __func__);
+  EditSelectBuf_Cache *esel = MEM_cnew<EditSelectBuf_Cache>(__func__);
   wm_userdata->data = esel;
   wm_userdata->free_fn = editselect_buf_cache_free_voidp;
   wm_userdata->use_free = true;
@@ -233,7 +236,7 @@ static void editselect_buf_cache_init_with_generic_userdata(wmGenericUserData *w
 /** \name Internal Edit-Mesh Utilities
  * \{ */
 
-static bool edbm_backbuf_check_and_select_verts(struct EditSelectBuf_Cache *esel,
+static bool edbm_backbuf_check_and_select_verts(EditSelectBuf_Cache *esel,
                                                 Depsgraph *depsgraph,
                                                 Object *ob,
                                                 BMEditMesh *em,
@@ -265,7 +268,7 @@ static bool edbm_backbuf_check_and_select_verts(struct EditSelectBuf_Cache *esel
   return changed;
 }
 
-static bool edbm_backbuf_check_and_select_edges(struct EditSelectBuf_Cache *esel,
+static bool edbm_backbuf_check_and_select_edges(EditSelectBuf_Cache *esel,
                                                 Depsgraph *depsgraph,
                                                 Object *ob,
                                                 BMEditMesh *em,
@@ -297,7 +300,7 @@ static bool edbm_backbuf_check_and_select_edges(struct EditSelectBuf_Cache *esel
   return changed;
 }
 
-static bool edbm_backbuf_check_and_select_faces(struct EditSelectBuf_Cache *esel,
+static bool edbm_backbuf_check_and_select_faces(EditSelectBuf_Cache *esel,
                                                 Depsgraph *depsgraph,
                                                 Object *ob,
                                                 BMEditMesh *em,
@@ -331,18 +334,21 @@ static bool edbm_backbuf_check_and_select_faces(struct EditSelectBuf_Cache *esel
 
 /* object mode, edbm_ prefix is confusing here, rename? */
 static bool edbm_backbuf_check_and_select_verts_obmode(Mesh *me,
-                                                       struct EditSelectBuf_Cache *esel,
+                                                       EditSelectBuf_Cache *esel,
                                                        const eSelectOp sel_op)
 {
-  MVert *mv = me->mvert;
-  uint index;
+  MVert *verts = BKE_mesh_verts_for_write(me);
+  MVert *mv = verts;
   bool changed = false;
 
   const BLI_bitmap *select_bitmap = esel->select_bitmap;
 
   if (mv) {
-    for (index = 0; index < me->totvert; index++, mv++) {
-      if (!(mv->flag & ME_HIDE)) {
+    const bool *hide_vert = (const bool *)CustomData_get_layer_named(
+        &me->vdata, CD_PROP_BOOL, ".hide_vert");
+
+    for (int index = 0; index < me->totvert; index++, mv++) {
+      if (!(hide_vert && hide_vert[index])) {
         const bool is_select = mv->flag & SELECT;
         const bool is_inside = BLI_BITMAP_TEST_BOOL(select_bitmap, index);
         const int sel_op_result = ED_select_op_action_deselected(sel_op, is_select, is_inside);
@@ -358,23 +364,25 @@ static bool edbm_backbuf_check_and_select_verts_obmode(Mesh *me,
 
 /* object mode, edbm_ prefix is confusing here, rename? */
 static bool edbm_backbuf_check_and_select_faces_obmode(Mesh *me,
-                                                       struct EditSelectBuf_Cache *esel,
+                                                       EditSelectBuf_Cache *esel,
                                                        const eSelectOp sel_op)
 {
-  MPoly *mpoly = me->mpoly;
-  uint index;
+  MPoly *polys = BKE_mesh_polys_for_write(me);
   bool changed = false;
 
   const BLI_bitmap *select_bitmap = esel->select_bitmap;
 
-  if (mpoly) {
-    for (index = 0; index < me->totpoly; index++, mpoly++) {
-      if (!(mpoly->flag & ME_HIDE)) {
-        const bool is_select = mpoly->flag & ME_FACE_SEL;
+  if (polys) {
+    const bool *hide_poly = (const bool *)CustomData_get_layer_named(
+        &me->vdata, CD_PROP_BOOL, ".hide_poly");
+
+    for (int index = 0; index < me->totpoly; index++) {
+      if (!(hide_poly && hide_poly[index])) {
+        const bool is_select = polys[index].flag & ME_FACE_SEL;
         const bool is_inside = BLI_BITMAP_TEST_BOOL(select_bitmap, index);
         const int sel_op_result = ED_select_op_action_deselected(sel_op, is_select, is_inside);
         if (sel_op_result != -1) {
-          SET_FLAG_FROM_TEST(mpoly->flag, sel_op_result, ME_FACE_SEL);
+          SET_FLAG_FROM_TEST(polys[index].flag, sel_op_result, ME_FACE_SEL);
           changed = true;
         }
       }
@@ -389,7 +397,7 @@ static bool edbm_backbuf_check_and_select_faces_obmode(Mesh *me,
 /** \name Lasso Select
  * \{ */
 
-typedef struct LassoSelectUserData {
+struct LassoSelectUserData {
   ViewContext *vc;
   const rcti *rect;
   const rctf *rect_fl;
@@ -403,7 +411,7 @@ typedef struct LassoSelectUserData {
   int pass;
   bool is_done;
   bool is_changed;
-} LassoSelectUserData;
+};
 
 static void view3d_userdata_lassoselect_init(LassoSelectUserData *r_data,
                                              ViewContext *vc,
@@ -422,7 +430,7 @@ static void view3d_userdata_lassoselect_init(LassoSelectUserData *r_data,
   r_data->mcoords_len = mcoords_len;
   r_data->sel_op = sel_op;
   /* SELECT by default, but can be changed if needed (only few cases use and respect this). */
-  r_data->select_flag = SELECT;
+  r_data->select_flag = (eBezTriple_Flag)SELECT;
 
   /* runtime */
   r_data->pass = 0;
@@ -435,24 +443,24 @@ static bool view3d_selectable_data(bContext *C)
   Object *ob = CTX_data_active_object(C);
 
   if (!ED_operator_region_view3d_active(C)) {
-    return 0;
+    return false;
   }
 
   if (ob) {
     if (ob->mode & OB_MODE_EDIT) {
       if (ob->type == OB_FONT) {
-        return 0;
+        return false;
       }
     }
     else {
       if ((ob->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT | OB_MODE_TEXTURE_PAINT)) &&
           !BKE_paint_select_elem_test(ob)) {
-        return 0;
+        return false;
       }
     }
   }
 
-  return 1;
+  return true;
 }
 
 /* helper also for box_select */
@@ -467,21 +475,21 @@ static bool edge_inside_rect(const rctf *rect, const float v1[2], const float v2
 
   /* check points in rect */
   if (edge_fully_inside_rect(rect, v1, v2)) {
-    return 1;
+    return true;
   }
 
   /* check points completely out rect */
   if (v1[0] < rect->xmin && v2[0] < rect->xmin) {
-    return 0;
+    return false;
   }
   if (v1[0] > rect->xmax && v2[0] > rect->xmax) {
-    return 0;
+    return false;
   }
   if (v1[1] < rect->ymin && v2[1] < rect->ymin) {
-    return 0;
+    return false;
   }
   if (v1[1] > rect->ymax && v2[1] > rect->ymax) {
-    return 0;
+    return false;
   }
 
   /* simple check lines intersecting. */
@@ -491,22 +499,22 @@ static bool edge_inside_rect(const rctf *rect, const float v1[2], const float v2
   d4 = (v1[1] - v2[1]) * (v1[0] - rect->xmax) + (v2[0] - v1[0]) * (v1[1] - rect->ymin);
 
   if (d1 < 0 && d2 < 0 && d3 < 0 && d4 < 0) {
-    return 0;
+    return false;
   }
   if (d1 > 0 && d2 > 0 && d3 > 0 && d4 > 0) {
-    return 0;
+    return false;
   }
 
-  return 1;
+  return true;
 }
 
 static void do_lasso_select_pose__do_tag(void *userData,
-                                         struct bPoseChannel *pchan,
+                                         bPoseChannel *pchan,
                                          const float screen_co_a[2],
                                          const float screen_co_b[2])
 {
-  LassoSelectUserData *data = userData;
-  const bArmature *arm = data->vc->obact->data;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
+  const bArmature *arm = static_cast<bArmature *>(data->vc->obact->data);
   if (!PBONE_SELECTABLE(arm, pchan->bone)) {
     return;
   }
@@ -527,7 +535,7 @@ static void do_lasso_tag_pose(ViewContext *vc,
   LassoSelectUserData data;
   rcti rect;
 
-  if ((ob->type != OB_ARMATURE) || (ob->pose == NULL)) {
+  if ((ob->type != OB_ARMATURE) || (ob->pose == nullptr)) {
     return;
   }
 
@@ -536,7 +544,8 @@ static void do_lasso_tag_pose(ViewContext *vc,
 
   BLI_lasso_boundbox(&rect, mcoords, mcoords_len);
 
-  view3d_userdata_lassoselect_init(&data, vc, &rect, mcoords, mcoords_len, 0);
+  view3d_userdata_lassoselect_init(
+      &data, vc, &rect, mcoords, mcoords_len, static_cast<eSelectOp>(0));
 
   ED_view3d_init_mats_rv3d(vc_tmp.obact, vc->rv3d);
 
@@ -553,14 +562,13 @@ static bool do_lasso_select_objects(ViewContext *vc,
                                     const eSelectOp sel_op)
 {
   View3D *v3d = vc->v3d;
-  Base *base;
 
   bool changed = false;
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    changed |= object_deselect_all_visible(vc->view_layer, vc->v3d);
+    changed |= object_deselect_all_visible(vc->scene, vc->view_layer, vc->v3d);
   }
-
-  for (base = vc->view_layer->object_bases.first; base; base = base->next) {
+  BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(vc->view_layer)) {
     if (BASE_SELECTABLE(v3d, base)) { /* Use this to avoid unnecessary lasso look-ups. */
       const bool is_select = base->flag & BASE_SELECTED;
       const bool is_inside = ((ED_view3d_project_base(vc->region, base) == V3D_PROJ_RET_OK) &&
@@ -584,32 +592,32 @@ static bool do_lasso_select_objects(ViewContext *vc,
 /**
  * Use for lasso & box select.
  */
-static Base **do_pose_tag_select_op_prepare(ViewContext *vc, uint *r_bases_len)
+static blender::Vector<Base *> do_pose_tag_select_op_prepare(ViewContext *vc)
 {
-  Base **bases = NULL;
-  BLI_array_declare(bases);
-  FOREACH_BASE_IN_MODE_BEGIN (vc->view_layer, vc->v3d, OB_ARMATURE, OB_MODE_POSE, base_iter) {
+  blender::Vector<Base *> bases;
+
+  FOREACH_BASE_IN_MODE_BEGIN (
+      vc->scene, vc->view_layer, vc->v3d, OB_ARMATURE, OB_MODE_POSE, base_iter) {
     Object *ob_iter = base_iter->object;
-    bArmature *arm = ob_iter->data;
+    bArmature *arm = static_cast<bArmature *>(ob_iter->data);
     LISTBASE_FOREACH (bPoseChannel *, pchan, &ob_iter->pose->chanbase) {
       Bone *bone = pchan->bone;
       bone->flag &= ~BONE_DONE;
     }
     arm->id.tag |= LIB_TAG_DOIT;
     ob_iter->id.tag &= ~LIB_TAG_DOIT;
-    BLI_array_append(bases, base_iter);
+    bases.append(base_iter);
   }
   FOREACH_BASE_IN_MODE_END;
-  *r_bases_len = BLI_array_len(bases);
   return bases;
 }
 
-static bool do_pose_tag_select_op_exec(Base **bases, const uint bases_len, const eSelectOp sel_op)
+static bool do_pose_tag_select_op_exec(blender::MutableSpan<Base *> bases, const eSelectOp sel_op)
 {
   bool changed_multi = false;
 
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    for (int i = 0; i < bases_len; i++) {
+    for (const int i : bases.index_range()) {
       Base *base_iter = bases[i];
       Object *ob_iter = base_iter->object;
       if (ED_pose_deselect_all(ob_iter, SEL_DESELECT, false)) {
@@ -619,10 +627,10 @@ static bool do_pose_tag_select_op_exec(Base **bases, const uint bases_len, const
     }
   }
 
-  for (int i = 0; i < bases_len; i++) {
+  for (const int i : bases.index_range()) {
     Base *base_iter = bases[i];
     Object *ob_iter = base_iter->object;
-    bArmature *arm = ob_iter->data;
+    bArmature *arm = static_cast<bArmature *>(ob_iter->data);
 
     /* Don't handle twice. */
     if (arm->id.tag & LIB_TAG_DOIT) {
@@ -643,7 +651,7 @@ static bool do_pose_tag_select_op_exec(Base **bases, const uint bases_len, const
           SET_FLAG_FROM_TEST(bone->flag, sel_op_result, BONE_SELECTED);
           if (sel_op_result == 0) {
             if (arm->act_bone == bone) {
-              arm->act_bone = NULL;
+              arm->act_bone = nullptr;
             }
           }
           changed = true;
@@ -663,22 +671,20 @@ static bool do_lasso_select_pose(ViewContext *vc,
                                  const int mcoords_len,
                                  const eSelectOp sel_op)
 {
-  uint bases_len;
-  Base **bases = do_pose_tag_select_op_prepare(vc, &bases_len);
+  blender::Vector<Base *> bases = do_pose_tag_select_op_prepare(vc);
 
-  for (int i = 0; i < bases_len; i++) {
+  for (const int i : bases.index_range()) {
     Base *base_iter = bases[i];
     Object *ob_iter = base_iter->object;
     do_lasso_tag_pose(vc, ob_iter, mcoords, mcoords_len);
   }
 
-  const bool changed_multi = do_pose_tag_select_op_exec(bases, bases_len, sel_op);
+  const bool changed_multi = do_pose_tag_select_op_exec(bases, sel_op);
   if (changed_multi) {
     DEG_id_tag_update(&vc->scene->id, ID_RECALC_SELECT);
     WM_main_add_notifier(NC_SCENE | ND_OB_SELECT, vc->scene);
   }
 
-  MEM_freeN(bases);
   return changed_multi;
 }
 
@@ -687,7 +693,7 @@ static void do_lasso_select_mesh__doSelectVert(void *userData,
                                                const float screen_co[2],
                                                int UNUSED(index))
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
   const bool is_select = BM_elem_flag_test(eve, BM_ELEM_SELECT);
   const bool is_inside =
       (BLI_rctf_isect_pt_v(data->rect_fl, screen_co) &&
@@ -701,7 +707,7 @@ static void do_lasso_select_mesh__doSelectVert(void *userData,
 }
 struct LassoSelectUserData_ForMeshEdge {
   LassoSelectUserData *data;
-  struct EditSelectBuf_Cache *esel;
+  EditSelectBuf_Cache *esel;
   uint backbuf_offset;
 };
 static void do_lasso_select_mesh__doSelectEdge_pass0(void *user_data,
@@ -710,7 +716,8 @@ static void do_lasso_select_mesh__doSelectEdge_pass0(void *user_data,
                                                      const float screen_co_b[2],
                                                      int index)
 {
-  struct LassoSelectUserData_ForMeshEdge *data_for_edge = user_data;
+  LassoSelectUserData_ForMeshEdge *data_for_edge = static_cast<LassoSelectUserData_ForMeshEdge *>(
+      user_data);
   LassoSelectUserData *data = data_for_edge->data;
   bool is_visible = true;
   if (data_for_edge->backbuf_offset) {
@@ -738,7 +745,8 @@ static void do_lasso_select_mesh__doSelectEdge_pass1(void *user_data,
                                                      const float screen_co_b[2],
                                                      int index)
 {
-  struct LassoSelectUserData_ForMeshEdge *data_for_edge = user_data;
+  LassoSelectUserData_ForMeshEdge *data_for_edge = static_cast<LassoSelectUserData_ForMeshEdge *>(
+      user_data);
   LassoSelectUserData *data = data_for_edge->data;
   bool is_visible = true;
   if (data_for_edge->backbuf_offset) {
@@ -764,7 +772,7 @@ static void do_lasso_select_mesh__doSelectFace(void *userData,
                                                const float screen_co[2],
                                                int UNUSED(index))
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
   const bool is_select = BM_elem_flag_test(efa, BM_ELEM_SELECT);
   const bool is_inside =
       (BLI_rctf_isect_pt_v(data->rect_fl, screen_co) &&
@@ -808,13 +816,13 @@ static bool do_lasso_select_mesh(ViewContext *vc,
 
   const bool use_zbuf = !XRAY_FLAG_ENABLED(vc->v3d);
 
-  struct EditSelectBuf_Cache *esel = wm_userdata->data;
+  EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
   if (use_zbuf) {
-    if (wm_userdata->data == NULL) {
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, ts->selectmode);
-      esel = wm_userdata->data;
+      esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
       esel->select_bitmap = DRW_select_buffer_bitmap_from_poly(
-          vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, NULL);
+          vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, nullptr);
     }
   }
 
@@ -830,16 +838,15 @@ static bool do_lasso_select_mesh(ViewContext *vc,
   }
   if (ts->selectmode & SCE_SELECT_EDGE) {
     /* Does both use_zbuf and non-use_zbuf versions (need screen cos for both) */
-    struct LassoSelectUserData_ForMeshEdge data_for_edge = {
-        .data = &data,
-        .esel = use_zbuf ? esel : NULL,
-        .backbuf_offset = use_zbuf ? DRW_select_buffer_context_offset_for_object_elem(
-                                         vc->depsgraph, vc->obedit, SCE_SELECT_EDGE) :
-                                     0,
-    };
+    LassoSelectUserData_ForMeshEdge data_for_edge{};
+    data_for_edge.data = &data;
+    data_for_edge.esel = use_zbuf ? esel : nullptr;
+    data_for_edge.backbuf_offset = use_zbuf ? DRW_select_buffer_context_offset_for_object_elem(
+                                                  vc->depsgraph, vc->obedit, SCE_SELECT_EDGE) :
+                                              0;
 
     const eV3DProjTest clip_flag = V3D_PROJ_TEST_CLIP_NEAR |
-                                   (use_zbuf ? 0 : V3D_PROJ_TEST_CLIP_BB);
+                                   (use_zbuf ? (eV3DProjTest)0 : V3D_PROJ_TEST_CLIP_BB);
     /* Fully inside. */
     mesh_foreachScreenEdge_clip_bb_segment(
         vc, do_lasso_select_mesh__doSelectEdge_pass0, &data_for_edge, clip_flag);
@@ -878,7 +885,7 @@ static void do_lasso_select_curve__doSelect(void *userData,
                                             bool handles_visible,
                                             const float screen_co[2])
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
 
   const bool is_inside = BLI_lasso_is_point_inside(
       data->mcoords, data->mcoords_len, screen_co[0], screen_co[1], IS_CLIPPED);
@@ -944,14 +951,14 @@ static bool do_lasso_select_curve(ViewContext *vc,
   }
 
   if (data.is_changed) {
-    BKE_curve_nurb_vert_active_validate(vc->obedit->data);
+    BKE_curve_nurb_vert_active_validate(static_cast<Curve *>(vc->obedit->data));
   }
   return data.is_changed;
 }
 
 static void do_lasso_select_lattice__doSelect(void *userData, BPoint *bp, const float screen_co[2])
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
   const bool is_select = bp->f1 & SELECT;
   const bool is_inside =
       (BLI_rctf_isect_pt_v(data->rect_fl, screen_co) &&
@@ -990,8 +997,8 @@ static void do_lasso_select_armature__doSelectBone(void *userData,
                                                    const float screen_co_a[2],
                                                    const float screen_co_b[2])
 {
-  LassoSelectUserData *data = userData;
-  const bArmature *arm = data->vc->obedit->data;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
+  const bArmature *arm = static_cast<const bArmature *>(data->vc->obedit->data);
   if (!EBONE_VISIBLE(arm, ebone)) {
     return;
   }
@@ -1039,8 +1046,8 @@ static void do_lasso_select_armature__doSelectBone_clip_content(void *userData,
                                                                 const float screen_co_a[2],
                                                                 const float screen_co_b[2])
 {
-  LassoSelectUserData *data = userData;
-  bArmature *arm = data->vc->obedit->data;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
+  bArmature *arm = static_cast<bArmature *>(data->vc->obedit->data);
   if (!EBONE_VISIBLE(arm, ebone)) {
     return;
   }
@@ -1079,7 +1086,7 @@ static bool do_lasso_select_armature(ViewContext *vc,
     data.is_changed |= ED_armature_edit_deselect_all_visible(vc->obedit);
   }
 
-  bArmature *arm = vc->obedit->data;
+  bArmature *arm = static_cast<bArmature *>(vc->obedit->data);
 
   ED_armature_ebone_listbase_temp_clear(arm->edbo);
 
@@ -1097,7 +1104,7 @@ static bool do_lasso_select_armature(ViewContext *vc,
                              &data,
                              V3D_PROJ_TEST_CLIP_DEFAULT | V3D_PROJ_TEST_CLIP_CONTENT_DEFAULT);
 
-  data.is_changed |= ED_armature_edit_select_op_from_tagged(vc->obedit->data, sel_op);
+  data.is_changed |= ED_armature_edit_select_op_from_tagged(arm, sel_op);
 
   if (data.is_changed) {
     WM_main_add_notifier(NC_OBJECT | ND_BONE_SELECT, vc->obedit);
@@ -1106,10 +1113,10 @@ static bool do_lasso_select_armature(ViewContext *vc,
 }
 
 static void do_lasso_select_mball__doSelectElem(void *userData,
-                                                struct MetaElem *ml,
+                                                MetaElem *ml,
                                                 const float screen_co[2])
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
   const bool is_select = ml->flag & SELECT;
   const bool is_inside =
       (BLI_rctf_isect_pt_v(data->rect_fl, screen_co) &&
@@ -1152,7 +1159,7 @@ static void do_lasso_select_meshobject__doSelectVert(void *userData,
                                                      const float screen_co[2],
                                                      int UNUSED(index))
 {
-  LassoSelectUserData *data = userData;
+  LassoSelectUserData *data = static_cast<LassoSelectUserData *>(userData);
   const bool is_select = mv->flag & SELECT;
   const bool is_inside =
       (BLI_rctf_isect_pt_v(data->rect_fl, screen_co) &&
@@ -1172,10 +1179,10 @@ static bool do_lasso_select_paintvert(ViewContext *vc,
 {
   const bool use_zbuf = !XRAY_ENABLED(vc->v3d);
   Object *ob = vc->obact;
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   rcti rect;
 
-  if (me == NULL || me->totvert == 0) {
+  if (me == nullptr || me->totvert == 0) {
     return false;
   }
 
@@ -1187,18 +1194,18 @@ static bool do_lasso_select_paintvert(ViewContext *vc,
 
   BLI_lasso_boundbox(&rect, mcoords, mcoords_len);
 
-  struct EditSelectBuf_Cache *esel = wm_userdata->data;
+  EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
   if (use_zbuf) {
-    if (wm_userdata->data == NULL) {
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_VERTEX);
-      esel = wm_userdata->data;
+      esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
       esel->select_bitmap = DRW_select_buffer_bitmap_from_poly(
-          vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, NULL);
+          vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, nullptr);
     }
   }
 
   if (use_zbuf) {
-    if (esel->select_bitmap != NULL) {
+    if (esel->select_bitmap != nullptr) {
       changed |= edbm_backbuf_check_and_select_verts_obmode(me, esel, sel_op);
     }
   }
@@ -1232,10 +1239,10 @@ static bool do_lasso_select_paintface(ViewContext *vc,
                                       const eSelectOp sel_op)
 {
   Object *ob = vc->obact;
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
   rcti rect;
 
-  if (me == NULL || me->totpoly == 0) {
+  if (me == nullptr || me->totpoly == 0) {
     return false;
   }
 
@@ -1247,12 +1254,12 @@ static bool do_lasso_select_paintface(ViewContext *vc,
 
   BLI_lasso_boundbox(&rect, mcoords, mcoords_len);
 
-  struct EditSelectBuf_Cache *esel = wm_userdata->data;
-  if (esel == NULL) {
+  EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
+  if (esel == nullptr) {
     editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_FACE);
-    esel = wm_userdata->data;
+    esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
     esel->select_bitmap = DRW_select_buffer_bitmap_from_poly(
-        vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, NULL);
+        vc->depsgraph, vc->region, vc->v3d, mcoords, mcoords_len, &rect, nullptr);
   }
 
   if (esel->select_bitmap) {
@@ -1260,7 +1267,7 @@ static bool do_lasso_select_paintface(ViewContext *vc,
   }
 
   if (changed) {
-    paintface_flush_flags(vc->C, ob, SELECT);
+    paintface_flush_flags(vc->C, ob, true, false);
   }
   return changed;
 }
@@ -1274,10 +1281,10 @@ static bool view3d_lasso_select(bContext *C,
   Object *ob = CTX_data_active_object(C);
   bool changed_multi = false;
 
-  wmGenericUserData wm_userdata_buf = {0};
+  wmGenericUserData wm_userdata_buf = {nullptr, nullptr, false};
   wmGenericUserData *wm_userdata = &wm_userdata_buf;
 
-  if (vc->obedit == NULL) { /* Object Mode */
+  if (vc->obedit == nullptr) { /* Object Mode */
     if (BKE_paint_select_face_test(ob)) {
       changed_multi |= do_lasso_select_paintface(vc, wm_userdata, mcoords, mcoords_len, sel_op);
     }
@@ -1289,7 +1296,7 @@ static bool view3d_lasso_select(bContext *C,
       /* pass */
     }
     else if (ob && (ob->mode & OB_MODE_PARTICLE_EDIT)) {
-      changed_multi |= PE_lasso_select(C, mcoords, mcoords_len, sel_op);
+      changed_multi |= PE_lasso_select(C, mcoords, mcoords_len, sel_op) != OPERATOR_CANCELLED;
     }
     else if (ob && (ob->mode & OB_MODE_POSE)) {
       changed_multi |= do_lasso_select_pose(vc, mcoords, mcoords_len, sel_op);
@@ -1305,7 +1312,8 @@ static bool view3d_lasso_select(bContext *C,
     }
   }
   else { /* Edit Mode */
-    FOREACH_OBJECT_IN_MODE_BEGIN (vc->view_layer, vc->v3d, ob->type, ob->mode, ob_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (
+        vc->scene, vc->view_layer, vc->v3d, ob->type, ob->mode, ob_iter) {
       ED_view3d_viewcontext_init_object(vc, ob_iter);
       bool changed = false;
 
@@ -1335,7 +1343,7 @@ static bool view3d_lasso_select(bContext *C,
       }
 
       if (changed) {
-        DEG_id_tag_update(vc->obedit->data, ID_RECALC_SELECT);
+        DEG_id_tag_update(static_cast<ID *>(vc->obedit->data), ID_RECALC_SELECT);
         WM_event_add_notifier(C, NC_GEOM | ND_SELECT, vc->obedit->data);
         changed_multi = true;
       }
@@ -1364,7 +1372,7 @@ static int view3d_lasso_select_exec(bContext *C, wmOperator *op)
     /* setup view context for argument to callbacks */
     ED_view3d_viewcontext_init(C, &vc, depsgraph);
 
-    eSelectOp sel_op = RNA_enum_get(op->ptr, "mode");
+    eSelectOp sel_op = static_cast<eSelectOp>(RNA_enum_get(op->ptr, "mode"));
     bool changed_multi = view3d_lasso_select(C, &vc, mcoords, mcoords_len, sel_op);
 
     MEM_freeN((void *)mcoords);
@@ -1404,12 +1412,12 @@ void VIEW3D_OT_select_lasso(wmOperatorType *ot)
  * \{ */
 
 /* The max number of menu items in an object select menu */
-typedef struct SelMenuItemF {
+struct SelMenuItemF {
   char idname[MAX_ID_NAME - 2];
   int icon;
   Base *base_ptr;
   void *item_ptr;
-} SelMenuItemF;
+};
 
 #define SEL_MENU_SIZE 22
 static SelMenuItemF object_mouse_select_menu_data[SEL_MENU_SIZE];
@@ -1420,12 +1428,12 @@ static const EnumPropertyItem *object_select_menu_enum_itemf(bContext *C,
                                                              PropertyRNA *UNUSED(prop),
                                                              bool *r_free)
 {
-  EnumPropertyItem *item = NULL, item_tmp = {0};
+  EnumPropertyItem *item = nullptr, item_tmp = {0};
   int totitem = 0;
   int i = 0;
 
   /* Don't need context but avoid API doc-generation using this. */
-  if (C == NULL || object_mouse_select_menu_data[i].idname[0] == '\0') {
+  if (C == nullptr || object_mouse_select_menu_data[i].idname[0] == '\0') {
     return DummyRNA_NULL_items;
   }
 
@@ -1453,10 +1461,12 @@ static int object_select_menu_exec(bContext *C, wmOperator *op)
   const char *name = object_mouse_select_menu_data[name_index].idname;
 
   View3D *v3d = CTX_wm_view3d(C);
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  const Base *oldbasact = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Base *oldbasact = BKE_view_layer_active_base_get(view_layer);
 
-  Base *basact = NULL;
+  Base *basact = nullptr;
   CTX_DATA_BEGIN (C, Base *, base, selectable_bases) {
     /* This is a bit dodgy, there should only be ONE object with this name,
      * but library objects can mess this up. */
@@ -1467,7 +1477,7 @@ static int object_select_menu_exec(bContext *C, wmOperator *op)
   }
   CTX_DATA_END;
 
-  if (basact == NULL) {
+  if (basact == nullptr) {
     return OPERATOR_CANCELLED;
   }
   UNUSED_VARS_NDEBUG(v3d);
@@ -1494,7 +1504,7 @@ static int object_select_menu_exec(bContext *C, wmOperator *op)
     }
   }
   else {
-    object_deselect_all_except(view_layer, basact);
+    object_deselect_all_except(scene, view_layer, basact);
     ED_object_base_select(basact, BA_SELECT);
     changed = true;
   }
@@ -1538,14 +1548,14 @@ void VIEW3D_OT_select_menu(wmOperatorType *ot)
   /* #Object.id.name to select (dynamic enum). */
   prop = RNA_def_enum(ot->srna, "name", DummyRNA_NULL_items, 0, "Object Name", "");
   RNA_def_enum_funcs(prop, object_select_menu_enum_itemf);
-  RNA_def_property_flag(prop, PROP_HIDDEN | PROP_ENUM_NO_TRANSLATE);
+  RNA_def_property_flag(prop, (PropertyFlag)(PROP_HIDDEN | PROP_ENUM_NO_TRANSLATE));
   ot->prop = prop;
 
-  prop = RNA_def_boolean(ot->srna, "extend", 0, "Extend", "");
+  prop = RNA_def_boolean(ot->srna, "extend", false, "Extend", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "deselect", 0, "Deselect", "");
+  prop = RNA_def_boolean(ot->srna, "deselect", false, "Deselect", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "toggle", 0, "Toggle", "");
+  prop = RNA_def_boolean(ot->srna, "toggle", false, "Toggle", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
 
@@ -1557,12 +1567,12 @@ static bool object_mouse_select_menu(bContext *C,
                                      const GPUSelectResult *buffer,
                                      const int hits,
                                      const int mval[2],
-                                     const struct SelectPick_Params *params,
+                                     const SelectPick_Params *params,
                                      Base **r_basact)
 {
   int base_count = 0;
   bool ok;
-  LinkNodePair linklist = {NULL, NULL};
+  LinkNodePair linklist = {nullptr, nullptr};
 
   /* handle base->object->select_id */
   CTX_DATA_BEGIN (C, Base *, base, selectable_bases) {
@@ -1599,14 +1609,14 @@ static bool object_mouse_select_menu(bContext *C,
   }
   CTX_DATA_END;
 
-  *r_basact = NULL;
+  *r_basact = nullptr;
 
   if (base_count == 0) {
     return false;
   }
   if (base_count == 1) {
     Base *base = (Base *)linklist.list->link;
-    BLI_linklist_free(linklist.list, NULL);
+    BLI_linklist_free(linklist.list, nullptr);
     *r_basact = base;
     return false;
   }
@@ -1618,7 +1628,7 @@ static bool object_mouse_select_menu(bContext *C,
   memset(object_mouse_select_menu_data, 0, sizeof(object_mouse_select_menu_data));
 
   for (node = linklist.list, i = 0; node; node = node->next, i++) {
-    Base *base = node->link;
+    Base *base = static_cast<Base *>(node->link);
     Object *ob = base->object;
     const char *name = ob->id.name + 2;
 
@@ -1633,10 +1643,10 @@ static bool object_mouse_select_menu(bContext *C,
   RNA_boolean_set(&ptr, "extend", params->sel_op == SEL_OP_ADD);
   RNA_boolean_set(&ptr, "deselect", params->sel_op == SEL_OP_SUB);
   RNA_boolean_set(&ptr, "toggle", params->sel_op == SEL_OP_XOR);
-  WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, NULL);
+  WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, nullptr);
   WM_operator_properties_free(&ptr);
 
-  BLI_linklist_free(linklist.list, NULL);
+  BLI_linklist_free(linklist.list, nullptr);
   return true;
 }
 
@@ -1644,17 +1654,18 @@ static int bone_select_menu_exec(bContext *C, wmOperator *op)
 {
   const int name_index = RNA_enum_get(op->ptr, "name");
 
-  const struct SelectPick_Params params = {
-      .sel_op = ED_select_op_from_operator(op->ptr),
-  };
+  SelectPick_Params params{};
+  params.sel_op = ED_select_op_from_operator(op->ptr);
 
   View3D *v3d = CTX_wm_view3d(C);
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  const Base *oldbasact = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  const Base *oldbasact = BKE_view_layer_active_base_get(view_layer);
 
   Base *basact = object_mouse_select_menu_data[name_index].base_ptr;
 
-  if (basact == NULL) {
+  if (basact == nullptr) {
     return OPERATOR_CANCELLED;
   }
 
@@ -1666,7 +1677,8 @@ static int bone_select_menu_exec(bContext *C, wmOperator *op)
   }
   else {
     bPoseChannel *pchan = (bPoseChannel *)object_mouse_select_menu_data[name_index].item_ptr;
-    ED_armature_pose_select_pick_bone(view_layer, v3d, basact->object, pchan->bone, &params);
+    ED_armature_pose_select_pick_bone(
+        scene, view_layer, v3d, basact->object, pchan->bone, &params);
   }
 
   /* Weak but ensures we activate the menu again before using the enum. */
@@ -1690,7 +1702,7 @@ static int bone_select_menu_exec(bContext *C, wmOperator *op)
        * Selection causes this to be considered the 'active' pose in weight-paint mode.
        * Eventually this limitation may be removed.
        * For now, de-select all other pose objects deforming this mesh. */
-      ED_armature_pose_select_in_wpaint_mode(view_layer, basact);
+      ED_armature_pose_select_in_wpaint_mode(scene, view_layer, basact);
     }
     else {
       if (oldbasact != basact) {
@@ -1700,7 +1712,6 @@ static int bone_select_menu_exec(bContext *C, wmOperator *op)
   }
 
   /* Undo? */
-  Scene *scene = CTX_data_scene(C);
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
@@ -1729,14 +1740,14 @@ void VIEW3D_OT_bone_select_menu(wmOperatorType *ot)
   /* #Object.id.name to select (dynamic enum). */
   prop = RNA_def_enum(ot->srna, "name", DummyRNA_NULL_items, 0, "Bone Name", "");
   RNA_def_enum_funcs(prop, object_select_menu_enum_itemf);
-  RNA_def_property_flag(prop, PROP_HIDDEN | PROP_ENUM_NO_TRANSLATE);
+  RNA_def_property_flag(prop, (PropertyFlag)(PROP_HIDDEN | PROP_ENUM_NO_TRANSLATE));
   ot->prop = prop;
 
-  prop = RNA_def_boolean(ot->srna, "extend", 0, "Extend", "");
+  prop = RNA_def_boolean(ot->srna, "extend", false, "Extend", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "deselect", 0, "Deselect", "");
+  prop = RNA_def_boolean(ot->srna, "deselect", false, "Deselect", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "toggle", 0, "Toggle", "");
+  prop = RNA_def_boolean(ot->srna, "toggle", false, "Toggle", "");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 }
 
@@ -1747,19 +1758,19 @@ static bool bone_mouse_select_menu(bContext *C,
                                    const GPUSelectResult *buffer,
                                    const int hits,
                                    const bool is_editmode,
-                                   const struct SelectPick_Params *params)
+                                   const SelectPick_Params *params)
 {
   BLI_assert(buffer);
 
   int bone_count = 0;
-  LinkNodePair base_list = {NULL, NULL};
-  LinkNodePair bone_list = {NULL, NULL};
+  LinkNodePair base_list = {nullptr, nullptr};
+  LinkNodePair bone_list = {nullptr, nullptr};
   GSet *added_bones = BLI_gset_ptr_new("Bone mouse select menu");
 
   /* Select logic taken from ed_armature_pick_bone_from_selectbuffer_impl in armature_select.c */
   for (int a = 0; a < hits; a++) {
-    void *bone_ptr = NULL;
-    Base *bone_base = NULL;
+    void *bone_ptr = nullptr;
+    Base *bone_base = nullptr;
     uint hitresult = buffer[a].id;
 
     if (!(hitresult & BONESEL_ANY)) {
@@ -1787,8 +1798,8 @@ static bool bone_mouse_select_menu(bContext *C,
     if (is_editmode) {
       EditBone *ebone;
       const uint hit_bone = (hitresult & ~BONESEL_ANY) >> 16;
-      bArmature *arm = bone_base->object->data;
-      ebone = BLI_findlink(arm->edbo, hit_bone);
+      bArmature *arm = static_cast<bArmature *>(bone_base->object->data);
+      ebone = static_cast<EditBone *>(BLI_findlink(arm->edbo, hit_bone));
       if (ebone && !(ebone->flag & BONE_UNSELECTABLE)) {
         bone_ptr = ebone;
       }
@@ -1796,7 +1807,8 @@ static bool bone_mouse_select_menu(bContext *C,
     else {
       bPoseChannel *pchan;
       const uint hit_bone = (hitresult & ~BONESEL_ANY) >> 16;
-      pchan = BLI_findlink(&bone_base->object->pose->chanbase, hit_bone);
+      pchan = static_cast<bPoseChannel *>(
+          BLI_findlink(&bone_base->object->pose->chanbase, hit_bone));
       if (pchan && !(pchan->bone->flag & BONE_UNSELECTABLE)) {
         bone_ptr = pchan;
       }
@@ -1821,14 +1833,14 @@ static bool bone_mouse_select_menu(bContext *C,
     }
   }
 
-  BLI_gset_free(added_bones, NULL);
+  BLI_gset_free(added_bones, nullptr);
 
   if (bone_count == 0) {
     return false;
   }
   if (bone_count == 1) {
-    BLI_linklist_free(base_list.list, NULL);
-    BLI_linklist_free(bone_list.list, NULL);
+    BLI_linklist_free(base_list.list, nullptr);
+    BLI_linklist_free(bone_list.list, nullptr);
     return false;
   }
 
@@ -1842,15 +1854,15 @@ static bool bone_mouse_select_menu(bContext *C,
        base_node = base_node->next, bone_node = bone_node->next, i++) {
     char *name;
 
-    object_mouse_select_menu_data[i].base_ptr = base_node->link;
+    object_mouse_select_menu_data[i].base_ptr = static_cast<Base *>(base_node->link);
 
     if (is_editmode) {
-      EditBone *ebone = bone_node->link;
+      EditBone *ebone = static_cast<EditBone *>(bone_node->link);
       object_mouse_select_menu_data[i].item_ptr = ebone;
       name = ebone->name;
     }
     else {
-      bPoseChannel *pchan = bone_node->link;
+      bPoseChannel *pchan = static_cast<bPoseChannel *>(bone_node->link);
       object_mouse_select_menu_data[i].item_ptr = pchan;
       name = pchan->name;
     }
@@ -1866,11 +1878,11 @@ static bool bone_mouse_select_menu(bContext *C,
   RNA_boolean_set(&ptr, "extend", params->sel_op == SEL_OP_ADD);
   RNA_boolean_set(&ptr, "deselect", params->sel_op == SEL_OP_SUB);
   RNA_boolean_set(&ptr, "toggle", params->sel_op == SEL_OP_XOR);
-  WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, NULL);
+  WM_operator_name_call_ptr(C, ot, WM_OP_INVOKE_DEFAULT, &ptr, nullptr);
   WM_operator_properties_free(&ptr);
 
-  BLI_linklist_free(base_list.list, NULL);
-  BLI_linklist_free(bone_list.list, NULL);
+  BLI_linklist_free(base_list.list, nullptr);
+  BLI_linklist_free(bone_list.list, nullptr);
   return true;
 }
 
@@ -1928,7 +1940,7 @@ static int mixed_bones_object_selectbuffer(ViewContext *vc,
   int hits15, hits9 = 0, hits5 = 0;
   bool has_bones15 = false, has_bones9 = false, has_bones5 = false;
 
-  int select_mode = (do_nearest ? VIEW3D_SELECT_PICK_NEAREST : VIEW3D_SELECT_PICK_ALL);
+  eV3DSelectMode select_mode = (do_nearest ? VIEW3D_SELECT_PICK_NEAREST : VIEW3D_SELECT_PICK_ALL);
   int hits = 0;
 
   if (do_nearest_xray_if_supported) {
@@ -2084,7 +2096,7 @@ static int gpu_select_buffer_depth_id_cmp(const void *sel_a_p, const void *sel_b
  * that are visible but not select-able,
  * since you may be in pose mode with an un-selectable object.
  *
- * \return the active base or NULL.
+ * \return the active base or nullptr.
  */
 static Base *mouse_select_eval_buffer(ViewContext *vc,
                                       const GPUSelectResult *buffer,
@@ -2094,6 +2106,7 @@ static Base *mouse_select_eval_buffer(ViewContext *vc,
                                       bool do_bones_get_priotity,
                                       int *r_select_id_subelem)
 {
+  Scene *scene = vc->scene;
   ViewLayer *view_layer = vc->view_layer;
   View3D *v3d = vc->v3d;
   int a;
@@ -2136,7 +2149,8 @@ static Base *mouse_select_eval_buffer(ViewContext *vc,
   else {
 
     {
-      GPUSelectResult *buffer_sorted = MEM_mallocN(sizeof(*buffer_sorted) * hits, __func__);
+      GPUSelectResult *buffer_sorted = static_cast<GPUSelectResult *>(
+          MEM_mallocN(sizeof(*buffer_sorted) * hits, __func__));
       memcpy(buffer_sorted, buffer, sizeof(*buffer_sorted) * hits);
       /* Remove non-bone objects. */
       if (has_bones && do_bones_get_priotity) {
@@ -2156,8 +2170,10 @@ static Base *mouse_select_eval_buffer(ViewContext *vc,
     /* It's possible there are no hits (all objects contained bones). */
     if (hits > 0) {
       /* Only exclude active object when it is selected. */
-      if (BASACT(view_layer) && (BASACT(view_layer)->flag & BASE_SELECTED)) {
-        const int select_id_active = BASACT(view_layer)->object->runtime.select_id;
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      Base *base = BKE_view_layer_active_base_get(view_layer);
+      if (base && (base->flag & BASE_SELECTED)) {
+        const int select_id_active = base->object->runtime.select_id;
         for (int i_next = 0, i_prev = hits - 1; i_next < hits; i_prev = i_next++) {
           if ((select_id_active == (buffer[i_prev].id & 0xFFFF)) &&
               (select_id_active != (buffer[i_next].id & 0xFFFF))) {
@@ -2182,9 +2198,10 @@ static Base *mouse_select_eval_buffer(ViewContext *vc,
     MEM_freeN((void *)buffer);
   }
 
-  Base *basact = NULL;
+  Base *basact = nullptr;
   if (found) {
-    for (Base *base = FIRSTBASE(view_layer); base; base = base->next) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       if (has_bones ? BASE_VISIBLE(v3d, base) : BASE_SELECTABLE(v3d, base)) {
         if (base->object->runtime.select_id == select_id) {
           basact = base;
@@ -2204,14 +2221,16 @@ static Base *mouse_select_eval_buffer(ViewContext *vc,
 static Base *mouse_select_object_center(ViewContext *vc, Base *startbase, const int mval[2])
 {
   ARegion *region = vc->region;
+  Scene *scene = vc->scene;
   ViewLayer *view_layer = vc->view_layer;
   View3D *v3d = vc->v3d;
 
-  Base *oldbasact = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *oldbasact = BKE_view_layer_active_base_get(view_layer);
 
   const float mval_fl[2] = {(float)mval[0], (float)mval[1]};
   float dist = ED_view3d_select_dist_px() * 1.3333f;
-  Base *basact = NULL;
+  Base *basact = nullptr;
 
   /* Put the active object at a disadvantage to cycle through other objects. */
   const float penalty_dist = 10.0f * UI_DPI_FAC;
@@ -2234,8 +2253,8 @@ static Base *mouse_select_object_center(ViewContext *vc, Base *startbase, const
     }
     base = base->next;
 
-    if (base == NULL) {
-      base = FIRSTBASE(view_layer);
+    if (base == nullptr) {
+      base = static_cast<Base *>(BKE_view_layer_object_bases_get(view_layer)->first);
     }
     if (base == startbase) {
       break;
@@ -2250,7 +2269,7 @@ static Base *ed_view3d_give_base_under_cursor_ex(bContext *C,
 {
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   ViewContext vc;
-  Base *basact = NULL;
+  Base *basact = nullptr;
   GPUSelectResult buffer[MAXPICKELEMS];
 
   /* setup view context for argument to callbacks */
@@ -2260,7 +2279,7 @@ static Base *ed_view3d_give_base_under_cursor_ex(bContext *C,
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
 
   const bool do_nearest = !XRAY_ACTIVE(vc.v3d);
-  const bool do_material_slot_selection = r_material_slot != NULL;
+  const bool do_material_slot_selection = r_material_slot != nullptr;
   const int hits = mixed_bones_object_selectbuffer(&vc,
                                                    buffer,
                                                    ARRAY_SIZE(buffer),
@@ -2271,7 +2290,7 @@ static Base *ed_view3d_give_base_under_cursor_ex(bContext *C,
                                                    do_material_slot_selection);
 
   if (hits > 0) {
-    const bool has_bones = (r_material_slot == NULL) && selectbuffer_has_bones(buffer, hits);
+    const bool has_bones = (r_material_slot == nullptr) && selectbuffer_has_bones(buffer, hits);
     basact = mouse_select_eval_buffer(
         &vc, buffer, hits, do_nearest, has_bones, true, r_material_slot);
   }
@@ -2281,7 +2300,7 @@ static Base *ed_view3d_give_base_under_cursor_ex(bContext *C,
 
 Base *ED_view3d_give_base_under_cursor(bContext *C, const int mval[2])
 {
-  return ed_view3d_give_base_under_cursor_ex(C, mval, NULL);
+  return ed_view3d_give_base_under_cursor_ex(C, mval, nullptr);
 }
 
 Object *ED_view3d_give_object_under_cursor(bContext *C, const int mval[2])
@@ -2290,33 +2309,33 @@ Object *ED_view3d_give_object_under_cursor(bContext *C, const int mval[2])
   if (base) {
     return base->object;
   }
-  return NULL;
+  return nullptr;
 }
 
-struct Object *ED_view3d_give_material_slot_under_cursor(struct bContext *C,
-                                                         const int mval[2],
-                                                         int *r_material_slot)
+Object *ED_view3d_give_material_slot_under_cursor(bContext *C,
+                                                  const int mval[2],
+                                                  int *r_material_slot)
 {
   Base *base = ed_view3d_give_base_under_cursor_ex(C, mval, r_material_slot);
   if (base) {
     return base->object;
   }
-  return NULL;
+  return nullptr;
 }
 
 bool ED_view3d_is_object_under_cursor(bContext *C, const int mval[2])
 {
-  return ED_view3d_give_object_under_cursor(C, mval) != NULL;
+  return ED_view3d_give_object_under_cursor(C, mval) != nullptr;
 }
 
 static void deselect_all_tracks(MovieTracking *tracking)
 {
   MovieTrackingObject *object;
 
-  object = tracking->objects.first;
+  object = static_cast<MovieTrackingObject *>(tracking->objects.first);
   while (object) {
     ListBase *tracksbase = BKE_tracking_object_get_tracks(tracking, object);
-    MovieTrackingTrack *track = tracksbase->first;
+    MovieTrackingTrack *track = static_cast<MovieTrackingTrack *>(tracksbase->first);
 
     while (track) {
       BKE_tracking_track_deselect(track, TRACK_AREA_ALL);
@@ -2332,16 +2351,16 @@ static bool ed_object_select_pick_camera_track(bContext *C,
                                                Scene *scene,
                                                Base *basact,
                                                MovieClip *clip,
-                                               const struct GPUSelectResult *buffer,
+                                               const GPUSelectResult *buffer,
                                                const short hits,
-                                               const struct SelectPick_Params *params)
+                                               const SelectPick_Params *params)
 {
   bool changed = false;
   bool found = false;
 
   MovieTracking *tracking = &clip->tracking;
-  ListBase *tracksbase = NULL;
-  MovieTrackingTrack *track = NULL;
+  ListBase *tracksbase = nullptr;
+  MovieTrackingTrack *track = nullptr;
 
   for (int i = 0; i < hits; i++) {
     const int hitresult = buffer[i].id;
@@ -2429,7 +2448,7 @@ static bool ed_object_select_pick_camera_track(bContext *C,
  */
 static bool ed_object_select_pick(bContext *C,
                                   const int mval[2],
-                                  const struct SelectPick_Params *params,
+                                  const SelectPick_Params *params,
                                   const bool center,
                                   const bool enumerate,
                                   const bool object_only)
@@ -2443,21 +2462,21 @@ static bool ed_object_select_pick(bContext *C,
   View3D *v3d = vc.v3d;
 
   /* Menu activation may find a base to make active (if it only finds a single item to select). */
-  Base *basact_override = NULL;
+  Base *basact_override = nullptr;
 
-  const bool is_obedit = (vc.obedit != NULL);
+  const bool is_obedit = (vc.obedit != nullptr);
   if (object_only) {
     /* Signal for #view3d_opengl_select to skip edit-mode objects. */
-    vc.obedit = NULL;
+    vc.obedit = nullptr;
   }
 
-  /* Set for GPU depth buffer picking, leave NULL when selecting by center. */
-  struct {
+  /* Set for GPU depth buffer picking, leave null when selecting by center. */
+  struct GPUData {
     GPUSelectResult buffer[MAXPICKELEMS];
     int hits;
     bool do_nearest;
     bool has_bones;
-  } *gpu = NULL;
+  } *gpu = nullptr;
 
   /* First handle menu selection, early exit if a menu opens
    * since this takes ownership of the selection action.
@@ -2466,7 +2485,7 @@ static bool ed_object_select_pick(bContext *C,
    * the item under the cursor. */
 
   if (center == false) {
-    gpu = MEM_mallocN(sizeof(*gpu), __func__);
+    gpu = MEM_new<GPUData>(__func__);
     gpu->do_nearest = false;
     gpu->has_bones = false;
 
@@ -2493,7 +2512,7 @@ static bool ed_object_select_pick(bContext *C,
   if (enumerate) {
     bool has_menu = false;
     if (center) {
-      if (object_mouse_select_menu(C, &vc, NULL, 0, mval, params, &basact_override)) {
+      if (object_mouse_select_menu(C, &vc, nullptr, 0, mval, params, &basact_override)) {
         has_menu = true;
       }
     }
@@ -2511,7 +2530,7 @@ static bool ed_object_select_pick(bContext *C,
 
     /* Let the menu handle any further actions. */
     if (has_menu) {
-      if (gpu != NULL) {
+      if (gpu != nullptr) {
         MEM_freeN(gpu);
       }
       return false;
@@ -2521,14 +2540,18 @@ static bool ed_object_select_pick(bContext *C,
   /* No menu, continue with selection. */
 
   ViewLayer *view_layer = vc.view_layer;
+  BKE_view_layer_synced_ensure(scene, view_layer);
   /* Don't set when the context has no active object (hidden), see: T60807. */
-  const Base *oldbasact = vc.obact ? BASACT(view_layer) : NULL;
+  const Base *oldbasact = vc.obact ? BKE_view_layer_active_base_get(view_layer) : nullptr;
   /* Always start list from `basact` when cycling the selection. */
-  Base *startbase = (oldbasact && oldbasact->next) ? oldbasact->next : FIRSTBASE(view_layer);
+  Base *startbase = (oldbasact && oldbasact->next) ?
+                        oldbasact->next :
+                        static_cast<Base *>(BKE_view_layer_object_bases_get(view_layer)->first);
 
   /* The next object's base to make active. */
-  Base *basact = NULL;
-  const eObjectMode object_mode = oldbasact ? oldbasact->object->mode : OB_MODE_OBJECT;
+  Base *basact = nullptr;
+  const eObjectMode object_mode = oldbasact ? static_cast<eObjectMode>(oldbasact->object->mode) :
+                                              OB_MODE_OBJECT;
 
   /* When enabled, don't attempt any further selection. */
   bool handled = false;
@@ -2575,8 +2598,8 @@ static bool ed_object_select_pick(bContext *C,
                                                           gpu->do_nearest,
                                                           gpu->has_bones,
                                                           do_bones_get_priotity,
-                                                          NULL) :
-                                 NULL;
+                                                          nullptr) :
+                                 nullptr;
     }
 
     /* Select pose-bones or camera-tracks. */
@@ -2586,7 +2609,7 @@ static bool ed_object_select_pick(bContext *C,
 
       if (basact && (gpu->has_bones && (basact->object->type == OB_CAMERA))) {
         MovieClip *clip = BKE_object_movieclip_get(scene, basact->object, false);
-        if (clip != NULL) {
+        if (clip != nullptr) {
           if (ed_object_select_pick_camera_track(
                   C, scene, basact, clip, gpu->buffer, gpu->hits, params)) {
             ED_object_base_select(basact, BA_SELECT);
@@ -2599,11 +2622,12 @@ static bool ed_object_select_pick(bContext *C,
             /* Fallback to regular object selection if no new bundles were selected,
              * allows to select object parented to reconstruction object. */
             basact = mouse_select_eval_buffer(
-                &vc, gpu->buffer, gpu->hits, gpu->do_nearest, false, false, NULL);
+                &vc, gpu->buffer, gpu->hits, gpu->do_nearest, false, false, nullptr);
           }
         }
       }
-      else if (ED_armature_pose_select_pick_with_buffer(view_layer,
+      else if (ED_armature_pose_select_pick_with_buffer(scene,
+                                                        view_layer,
                                                         v3d,
                                                         basact ? basact : (Base *)oldbasact,
                                                         gpu->buffer,
@@ -2616,7 +2640,7 @@ static bool ed_object_select_pick(bContext *C,
         /* When there is no `baseact` this will have operated on `oldbasact`,
          * allowing #SelectPick_Params.deselect_all work in pose-mode.
          * In this case no object operations are needed. */
-        if (basact != NULL) {
+        if (basact != nullptr) {
           /* By convention the armature-object is selected when in pose-mode.
            * While leaving it unselected will work, leaving pose-mode would leave the object
            * active + unselected which isn't ideal when performing other actions on the object. */
@@ -2634,7 +2658,7 @@ static bool ed_object_select_pick(bContext *C,
                * Selection causes this to be considered the 'active' pose in weight-paint mode.
                * Eventually this limitation may be removed.
                * For now, de-select all other pose objects deforming this mesh. */
-              ED_armature_pose_select_in_wpaint_mode(view_layer, basact);
+              ED_armature_pose_select_in_wpaint_mode(scene, view_layer, basact);
 
               handled = true;
             }
@@ -2671,11 +2695,11 @@ static bool ed_object_select_pick(bContext *C,
       if (is_obedit == false) {
         if (basact && !BKE_object_is_mode_compat(basact->object, object_mode)) {
           if (object_mode == OB_MODE_OBJECT) {
-            struct Main *bmain = vc.bmain;
+            Main *bmain = vc.bmain;
             ED_object_mode_generic_exit(bmain, vc.depsgraph, scene, basact->object);
           }
           if (!BKE_object_is_mode_compat(basact->object, object_mode)) {
-            basact = NULL;
+            basact = nullptr;
           }
         }
 
@@ -2684,7 +2708,7 @@ static bool ed_object_select_pick(bContext *C,
         if (basact && oldbasact) {
           if ((oldbasact->object->mode != basact->object->mode) &&
               (oldbasact->object->mode & basact->object->mode) == 0) {
-            basact = NULL;
+            basact = nullptr;
           }
         }
       }
@@ -2693,10 +2717,10 @@ static bool ed_object_select_pick(bContext *C,
 
   /* Ensure code above doesn't change the active base. This code is already fairly involved,
    * it's best if changing the active object is localized to a single place. */
-  BLI_assert(oldbasact == (vc.obact ? BASACT(view_layer) : NULL));
+  BLI_assert(oldbasact == (vc.obact ? BKE_view_layer_active_base_get(view_layer) : nullptr));
 
-  bool found = (basact != NULL);
-  if ((handled == false) && (vc.obedit == NULL)) {
+  bool found = (basact != nullptr);
+  if ((handled == false) && (vc.obedit == nullptr)) {
     /* Object-mode (pose mode will have been handled already). */
     if (params->sel_op == SEL_OP_SET) {
       if ((found && params->select_passthrough) && (basact->flag & BASE_SELECTED)) {
@@ -2704,8 +2728,8 @@ static bool ed_object_select_pick(bContext *C,
       }
       else if (found || params->deselect_all) {
         /* Deselect everything. */
-        /* `basact` may be NULL. */
-        if (object_deselect_all_except(view_layer, basact)) {
+        /* `basact` may be nullptr. */
+        if (object_deselect_all_except(scene, view_layer, basact)) {
           changed_object = true;
         }
       }
@@ -2717,7 +2741,7 @@ static bool ed_object_select_pick(bContext *C,
     if (vc.obedit) {
       /* Only do the select (use for setting vertex parents & hooks).
        * In edit-mode do not activate. */
-      object_deselect_all_except(view_layer, basact);
+      object_deselect_all_except(scene, view_layer, basact);
       ED_object_base_select(basact, BA_SELECT);
 
       changed_object = true;
@@ -2748,7 +2772,7 @@ static bool ed_object_select_pick(bContext *C,
           break;
         }
         case SEL_OP_SET: {
-          object_deselect_all_except(view_layer, basact);
+          object_deselect_all_except(scene, view_layer, basact);
           ED_object_base_select(basact, BA_SELECT);
           break;
         }
@@ -2764,7 +2788,7 @@ static bool ed_object_select_pick(bContext *C,
 
   /* Perform the activation even when 'handled', since this is used to ensure
    * the object from the pose-bone selected is also activated. */
-  if (use_activate_selected_base && (basact != NULL)) {
+  if (use_activate_selected_base && (basact != nullptr)) {
     changed_object = true;
     ED_object_base_activate(C, basact); /* adds notifier */
     if ((scene->toolsettings->object_flag & SCE_OBJECT_MODE_LOCK) == 0) {
@@ -2783,7 +2807,7 @@ static bool ed_object_select_pick(bContext *C,
     ED_outliner_select_sync_from_pose_bone_tag(C);
   }
 
-  if (gpu != NULL) {
+  if (gpu != nullptr) {
     MEM_freeN(gpu);
   }
 
@@ -2798,21 +2822,23 @@ static bool ed_object_select_pick(bContext *C,
  */
 static bool ed_wpaint_vertex_select_pick(bContext *C,
                                          const int mval[2],
-                                         const struct SelectPick_Params *params,
+                                         const SelectPick_Params *params,
                                          Object *obact)
 {
   View3D *v3d = CTX_wm_view3d(C);
   const bool use_zbuf = !XRAY_ENABLED(v3d);
 
-  Mesh *me = obact->data; /* already checked for NULL */
+  Mesh *me = static_cast<Mesh *>(obact->data); /* already checked for nullptr */
   uint index = 0;
+  MVert *verts = BKE_mesh_verts_for_write(me);
+
   MVert *mv;
   bool changed = false;
 
   bool found = ED_mesh_pick_vert(C, obact, mval, ED_MESH_PICK_DEFAULT_VERT_DIST, use_zbuf, &index);
 
   if (params->sel_op == SEL_OP_SET) {
-    if ((found && params->select_passthrough) && (me->mvert[index].flag & SELECT)) {
+    if ((found && params->select_passthrough) && (verts[index].flag & SELECT)) {
       found = false;
     }
     else if (found || params->deselect_all) {
@@ -2822,7 +2848,7 @@ static bool ed_wpaint_vertex_select_pick(bContext *C,
   }
 
   if (found) {
-    mv = &me->mvert[index];
+    mv = &verts[index];
     switch (params->sel_op) {
       case SEL_OP_ADD: {
         mv->flag |= SELECT;
@@ -2873,7 +2899,7 @@ static int view3d_select_exec(bContext *C, wmOperator *op)
   Object *obedit = CTX_data_edit_object(C);
   Object *obact = CTX_data_active_object(C);
 
-  struct SelectPick_Params params = {0};
+  SelectPick_Params params{};
   ED_select_pick_params_from_operator(op->ptr, &params);
 
   const bool vert_without_handles = RNA_boolean_get(op->ptr, "vert_without_handles");
@@ -2893,14 +2919,9 @@ static int view3d_select_exec(bContext *C, wmOperator *op)
   bool changed = false;
   int mval[2];
 
-  RNA_int_get_array(op->ptr, "location", mval);
-
-  view3d_operator_needs_opengl(C);
-  BKE_object_update_select_id(CTX_data_main(C));
-
   if (object_only) {
-    obedit = NULL;
-    obact = NULL;
+    obedit = nullptr;
+    obact = nullptr;
 
     /* ack, this is incorrect but to do this correctly we would need an
      * alternative edit-mode/object-mode keymap, this copies the functionality
@@ -2908,6 +2929,19 @@ static int view3d_select_exec(bContext *C, wmOperator *op)
     center = false;
   }
 
+  if (obedit && enumerate) {
+    /* Enumerate makes no sense in edit-mode unless also explicitly picking objects or bones.
+     * Pass the event through so the event may be handled by loop-select for e.g. see: T100204. */
+    if (obedit->type != OB_ARMATURE) {
+      return OPERATOR_PASS_THROUGH | OPERATOR_CANCELLED;
+    }
+  }
+
+  RNA_int_get_array(op->ptr, "location", mval);
+
+  view3d_operator_needs_opengl(C);
+  BKE_object_update_select_id(CTX_data_main(C));
+
   if (obedit && object_only == false) {
     if (obedit->type == OB_MESH) {
       changed = EDBM_select_pick(C, mval, &params);
@@ -2999,21 +3033,25 @@ void VIEW3D_OT_select(wmOperatorType *ot)
   prop = RNA_def_boolean(
       ot->srna,
       "center",
-      0,
+      false,
       "Center",
       "Use the object center when selecting, in edit mode used to extend object selection");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(
-      ot->srna, "enumerate", 0, "Enumerate", "List objects under the mouse (object mode only)");
+  prop = RNA_def_boolean(ot->srna,
+                         "enumerate",
+                         false,
+                         "Enumerate",
+                         "List objects under the mouse (object mode only)");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
-  prop = RNA_def_boolean(ot->srna, "object", 0, "Object", "Use object selection (edit mode only)");
+  prop = RNA_def_boolean(
+      ot->srna, "object", false, "Object", "Use object selection (edit mode only)");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
 
   /* Needed for select-through to usefully drag handles, see: T98254.
    * NOTE: this option may be removed and become default behavior, see design task: T98552. */
   prop = RNA_def_boolean(ot->srna,
                          "vert_without_handles",
-                         0,
+                         false,
                          "Control Point Without Handles",
                          "Only select the curve control point, not it's handles");
   RNA_def_property_flag(prop, PROP_SKIP_SAVE);
@@ -3021,7 +3059,7 @@ void VIEW3D_OT_select(wmOperatorType *ot)
   prop = RNA_def_int_vector(ot->srna,
                             "location",
                             2,
-                            NULL,
+                            nullptr,
                             INT_MIN,
                             INT_MAX,
                             "Location",
@@ -3037,7 +3075,7 @@ void VIEW3D_OT_select(wmOperatorType *ot)
 /** \name Box Select
  * \{ */
 
-typedef struct BoxSelectUserData {
+struct BoxSelectUserData {
   ViewContext *vc;
   const rcti *rect;
   const rctf *rect_fl;
@@ -3048,7 +3086,7 @@ typedef struct BoxSelectUserData {
   /* runtime */
   bool is_done;
   bool is_changed;
-} BoxSelectUserData;
+};
 
 static void view3d_userdata_boxselect_init(BoxSelectUserData *r_data,
                                            ViewContext *vc,
@@ -3063,7 +3101,7 @@ static void view3d_userdata_boxselect_init(BoxSelectUserData *r_data,
 
   r_data->sel_op = sel_op;
   /* SELECT by default, but can be changed if needed (only few cases use and respect this). */
-  r_data->select_flag = SELECT;
+  r_data->select_flag = (eBezTriple_Flag)SELECT;
 
   /* runtime */
   r_data->is_done = false;
@@ -3084,7 +3122,7 @@ static void do_paintvert_box_select__doSelectVert(void *userData,
                                                   const float screen_co[2],
                                                   int UNUSED(index))
 {
-  BoxSelectUserData *data = userData;
+  BoxSelectUserData *data = static_cast<BoxSelectUserData *>(userData);
   const bool is_select = mv->flag & SELECT;
   const bool is_inside = BLI_rctf_isect_pt_v(data->rect_fl, screen_co);
   const int sel_op_result = ED_select_op_action_deselected(data->sel_op, is_select, is_inside);
@@ -3100,11 +3138,9 @@ static bool do_paintvert_box_select(ViewContext *vc,
 {
   const bool use_zbuf = !XRAY_ENABLED(vc->v3d);
 
-  Mesh *me;
-
-  me = vc->obact->data;
-  if ((me == NULL) || (me->totvert == 0)) {
-    return OPERATOR_CANCELLED;
+  Mesh *me = static_cast<Mesh *>(vc->obact->data);
+  if ((me == nullptr) || (me->totvert == 0)) {
+    return false;
   }
 
   bool changed = false;
@@ -3116,14 +3152,14 @@ static bool do_paintvert_box_select(ViewContext *vc,
     /* pass */
   }
   else if (use_zbuf) {
-    struct EditSelectBuf_Cache *esel = wm_userdata->data;
-    if (wm_userdata->data == NULL) {
+    EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_VERTEX);
-      esel = wm_userdata->data;
+      esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
       esel->select_bitmap = DRW_select_buffer_bitmap_from_rect(
-          vc->depsgraph, vc->region, vc->v3d, rect, NULL);
+          vc->depsgraph, vc->region, vc->v3d, rect, nullptr);
     }
-    if (esel->select_bitmap != NULL) {
+    if (esel->select_bitmap != nullptr) {
       changed |= edbm_backbuf_check_and_select_verts_obmode(me, esel, sel_op);
     }
   }
@@ -3152,13 +3188,13 @@ static bool do_paintvert_box_select(ViewContext *vc,
 static bool do_paintface_box_select(ViewContext *vc,
                                     wmGenericUserData *wm_userdata,
                                     const rcti *rect,
-                                    int sel_op)
+                                    eSelectOp sel_op)
 {
   Object *ob = vc->obact;
   Mesh *me;
 
   me = BKE_mesh_from_object(ob);
-  if ((me == NULL) || (me->totpoly == 0)) {
+  if ((me == nullptr) || (me->totpoly == 0)) {
     return false;
   }
 
@@ -3171,20 +3207,20 @@ static bool do_paintface_box_select(ViewContext *vc,
     /* pass */
   }
   else {
-    struct EditSelectBuf_Cache *esel = wm_userdata->data;
-    if (wm_userdata->data == NULL) {
+    EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_FACE);
-      esel = wm_userdata->data;
+      esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
       esel->select_bitmap = DRW_select_buffer_bitmap_from_rect(
-          vc->depsgraph, vc->region, vc->v3d, rect, NULL);
+          vc->depsgraph, vc->region, vc->v3d, rect, nullptr);
     }
-    if (esel->select_bitmap != NULL) {
+    if (esel->select_bitmap != nullptr) {
       changed |= edbm_backbuf_check_and_select_faces_obmode(me, esel, sel_op);
     }
   }
 
   if (changed) {
-    paintface_flush_flags(vc->C, vc->obact, SELECT);
+    paintface_flush_flags(vc->C, vc->obact, true, false);
   }
   return changed;
 }
@@ -3197,7 +3233,7 @@ static void do_nurbs_box_select__doSelect(void *userData,
                                           bool handles_visible,
                                           const float screen_co[2])
 {
-  BoxSelectUserData *data = userData;
+  BoxSelectUserData *data = static_cast<BoxSelectUserData *>(userData);
 
   const bool is_inside = BLI_rctf_isect_pt_v(data->rect_fl, screen_co);
   if (bp) {
@@ -3254,14 +3290,14 @@ static bool do_nurbs_box_select(ViewContext *vc, rcti *rect, const eSelectOp sel
     data.is_changed |= BKE_nurbList_flag_set_from_flag(nurbs, BEZT_FLAG_TEMP_TAG, SELECT);
   }
 
-  BKE_curve_nurb_vert_active_validate(vc->obedit->data);
+  BKE_curve_nurb_vert_active_validate(curve);
 
   return data.is_changed;
 }
 
 static void do_lattice_box_select__doSelect(void *userData, BPoint *bp, const float screen_co[2])
 {
-  BoxSelectUserData *data = userData;
+  BoxSelectUserData *data = static_cast<BoxSelectUserData *>(userData);
   const bool is_select = bp->f1 & SELECT;
   const bool is_inside = BLI_rctf_isect_pt_v(data->rect_fl, screen_co);
   const int sel_op_result = ED_select_op_action_deselected(data->sel_op, is_select, is_inside);
@@ -3292,7 +3328,7 @@ static void do_mesh_box_select__doSelectVert(void *userData,
                                              const float screen_co[2],
                                              int UNUSED(index))
 {
-  BoxSelectUserData *data = userData;
+  BoxSelectUserData *data = static_cast<BoxSelectUserData *>(userData);
   const bool is_select = BM_elem_flag_test(eve, BM_ELEM_SELECT);
   const bool is_inside = BLI_rctf_isect_pt_v(data->rect_fl, screen_co);
   const int sel_op_result = ED_select_op_action_deselected(data->sel_op, is_select, is_inside);
@@ -3303,7 +3339,7 @@ static void do_mesh_box_select__doSelectVert(void *userData,
 }
 struct BoxSelectUserData_ForMeshEdge {
   BoxSelectUserData *data;
-  struct EditSelectBuf_Cache *esel;
+  EditSelectBuf_Cache *esel;
   uint backbuf_offset;
 };
 /**
@@ -3312,7 +3348,8 @@ struct BoxSelectUserData_ForMeshEdge {
 static void do_mesh_box_select__doSelectEdge_pass0(
     void *userData, BMEdge *eed, const float screen_co_a[2], const float screen_co_b[2], int index)
 {
-  struct BoxSelectUserData_ForMeshEdge *data_for_edge = userData;
+  BoxSelectUserData_ForMeshEdge *data_for_edge = static_cast<BoxSelectUserData_ForMeshEdge *>(
+      userData);
   BoxSelectUserData *data = data_for_edge->data;
   bool is_visible = true;
   if (data_for_edge->backbuf_offset) {
@@ -3336,7 +3373,8 @@ static void do_mesh_box_select__doSelectEdge_pass0(
 static void do_mesh_box_select__doSelectEdge_pass1(
     void *userData, BMEdge *eed, const float screen_co_a[2], const float screen_co_b[2], int index)
 {
-  struct BoxSelectUserData_ForMeshEdge *data_for_edge = userData;
+  BoxSelectUserData_ForMeshEdge *data_for_edge = static_cast<BoxSelectUserData_ForMeshEdge *>(
+      userData);
   BoxSelectUserData *data = data_for_edge->data;
   bool is_visible = true;
   if (data_for_edge->backbuf_offset) {
@@ -3357,7 +3395,7 @@ static void do_mesh_box_select__doSelectFace(void *userData,
                                              const float screen_co[2],
                                              int UNUSED(index))
 {
-  BoxSelectUserData *data = userData;
+  BoxSelectUserData *data = static_cast<BoxSelectUserData *>(userData);
   const bool is_select = BM_elem_flag_test(efa, BM_ELEM_SELECT);
   const bool is_inside = BLI_rctf_isect_pt_v(data->rect_fl, screen_co);
   const int sel_op_result = ED_select_op_action_deselected(data->sel_op, is_select, is_inside);
@@ -3390,13 +3428,13 @@ static bool do_mesh_box_select(ViewContext *vc,
 
   const bool use_zbuf = !XRAY_FLAG_ENABLED(vc->v3d);
 
-  struct EditSelectBuf_Cache *esel = wm_userdata->data;
+  EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
   if (use_zbuf) {
-    if (wm_userdata->data == NULL) {
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, ts->selectmode);
-      esel = wm_userdata->data;
+      esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
       esel->select_bitmap = DRW_select_buffer_bitmap_from_rect(
-          vc->depsgraph, vc->region, vc->v3d, rect, NULL);
+          vc->depsgraph, vc->region, vc->v3d, rect, nullptr);
     }
   }
 
@@ -3412,16 +3450,16 @@ static bool do_mesh_box_select(ViewContext *vc,
   }
   if (ts->selectmode & SCE_SELECT_EDGE) {
     /* Does both use_zbuf and non-use_zbuf versions (need screen cos for both) */
-    struct BoxSelectUserData_ForMeshEdge cb_data = {
-        .data = &data,
-        .esel = use_zbuf ? esel : NULL,
-        .backbuf_offset = use_zbuf ? DRW_select_buffer_context_offset_for_object_elem(
-                                         vc->depsgraph, vc->obedit, SCE_SELECT_EDGE) :
-                                     0,
+    struct BoxSelectUserData_ForMeshEdge cb_data {
     };
+    cb_data.data = &data;
+    cb_data.esel = use_zbuf ? esel : nullptr;
+    cb_data.backbuf_offset = use_zbuf ? DRW_select_buffer_context_offset_for_object_elem(
+                                            vc->depsgraph, vc->obedit, SCE_SELECT_EDGE) :
+                                        0;
 
     const eV3DProjTest clip_flag = V3D_PROJ_TEST_CLIP_NEAR |
-                                   (use_zbuf ? 0 : V3D_PROJ_TEST_CLIP_BB);
+                                   (use_zbuf ? (eV3DProjTest)0 : V3D_PROJ_TEST_CLIP_BB);
     /* Fully inside. */
     mesh_foreachScreenEdge_clip_bb_segment(
         vc, do_mesh_box_select__doSelectEdge_pass0, &cb_data, clip_flag);
@@ -3471,7 +3509,8 @@ static bool do_meta_box_select(ViewContext *vc, const rcti *rect, const eSelectO
   }
 
   int metaelem_id = 0;
-  for (ml = mb->editelems->first; ml; ml = ml->next, metaelem_id += 0x10000) {
+  for (ml = static_cast<MetaElem *>(mb->editelems->first); ml;
+       ml = ml->next, metaelem_id += 0x10000) {
     bool is_inside_radius = false;
     bool is_inside_stiff = false;
 
@@ -3535,7 +3574,7 @@ static bool do_armature_box_select(ViewContext *vc, const rcti *rect, const eSel
 
   uint bases_len = 0;
   Base **bases = BKE_view_layer_array_from_bases_in_edit_mode_unique_data(
-      vc->view_layer, vc->v3d, &bases_len);
+      vc->scene, vc->view_layer, vc->v3d, &bases_len);
 
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
     changed |= ED_armature_edit_deselect_all_visible_multi_ex(bases, bases_len);
@@ -3545,7 +3584,7 @@ static bool do_armature_box_select(ViewContext *vc, const rcti *rect, const eSel
     Object *obedit = bases[base_index]->object;
     obedit->id.tag &= ~LIB_TAG_DOIT;
 
-    bArmature *arm = obedit->data;
+    bArmature *arm = static_cast<bArmature *>(obedit->data);
     ED_armature_ebone_listbase_temp_clear(arm->edbo);
   }
 
@@ -3569,7 +3608,8 @@ static bool do_armature_box_select(ViewContext *vc, const rcti *rect, const eSel
     Object *obedit = bases[base_index]->object;
     if (obedit->id.tag & LIB_TAG_DOIT) {
       obedit->id.tag &= ~LIB_TAG_DOIT;
-      changed |= ED_armature_edit_select_op_from_tagged(obedit->data, sel_op);
+      changed |= ED_armature_edit_select_op_from_tagged(static_cast<bArmature *>(obedit->data),
+                                                        sel_op);
     }
   }
 
@@ -3607,33 +3647,33 @@ static bool do_object_box_select(bContext *C, ViewContext *vc, rcti *rect, const
   int totobj = MAXPICKELEMS; /* XXX solve later */
 
   /* Selection buffer has bones potentially too, so we add #MAXPICKELEMS. */
-  GPUSelectResult *buffer = MEM_mallocN((totobj + MAXPICKELEMS) * sizeof(GPUSelectResult),
-                                        "selection buffer");
+  GPUSelectResult *buffer = static_cast<GPUSelectResult *>(
+      MEM_mallocN((totobj + MAXPICKELEMS) * sizeof(GPUSelectResult), __func__));
   const eV3DSelectObjectFilter select_filter = ED_view3d_select_filter_from_mode(vc->scene,
                                                                                  vc->obact);
   const int hits = view3d_opengl_select(
       vc, buffer, (totobj + MAXPICKELEMS), rect, VIEW3D_SELECT_ALL, select_filter);
-
-  LISTBASE_FOREACH (Base *, base, &vc->view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(vc->scene, vc->view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(vc->view_layer)) {
     base->object->id.tag &= ~LIB_TAG_DOIT;
   }
 
-  Base **bases = NULL;
-  BLI_array_declare(bases);
+  blender::Vector<Base *> bases;
 
   bool changed = false;
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    changed |= object_deselect_all_visible(vc->view_layer, vc->v3d);
+    changed |= object_deselect_all_visible(vc->scene, vc->view_layer, vc->v3d);
   }
 
+  ListBase *object_bases = BKE_view_layer_object_bases_get(vc->view_layer);
   if ((hits == -1) && !SEL_OP_USE_OUTSIDE(sel_op)) {
     goto finally;
   }
 
-  LISTBASE_FOREACH (Base *, base, &vc->view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     if (BASE_SELECTABLE(v3d, base)) {
       if ((base->object->runtime.select_id & 0x0000FFFF) != 0) {
-        BLI_array_append(bases, base);
+        bases.append(base);
       }
     }
   }
@@ -3645,13 +3685,13 @@ static bool do_object_box_select(bContext *C, ViewContext *vc, rcti *rect, const
        buf_iter++) {
     bPoseChannel *pchan_dummy;
     Base *base = ED_armature_base_and_pchan_from_select_buffer(
-        bases, BLI_array_len(bases), buf_iter->id, &pchan_dummy);
-    if (base != NULL) {
+        bases.data(), bases.size(), buf_iter->id, &pchan_dummy);
+    if (base != nullptr) {
       base->object->id.tag |= LIB_TAG_DOIT;
     }
   }
 
-  for (Base *base = vc->view_layer->object_bases.first; base && hits; base = base->next) {
+  for (Base *base = static_cast<Base *>(object_bases->first); base && hits; base = base->next) {
     if (BASE_SELECTABLE(v3d, base)) {
       const bool is_select = base->flag & BASE_SELECTED;
       const bool is_inside = base->object->id.tag & LIB_TAG_DOIT;
@@ -3664,9 +3704,6 @@ static bool do_object_box_select(bContext *C, ViewContext *vc, rcti *rect, const
   }
 
 finally:
-  if (bases != NULL) {
-    MEM_freeN(bases);
-  }
 
   MEM_freeN(buffer);
 
@@ -3679,14 +3716,13 @@ finally:
 
 static bool do_pose_box_select(bContext *C, ViewContext *vc, rcti *rect, const eSelectOp sel_op)
 {
-  uint bases_len;
-  Base **bases = do_pose_tag_select_op_prepare(vc, &bases_len);
+  blender::Vector<Base *> bases = do_pose_tag_select_op_prepare(vc);
 
   int totobj = MAXPICKELEMS; /* XXX solve later */
 
   /* Selection buffer has bones potentially too, so add #MAXPICKELEMS. */
-  GPUSelectResult *buffer = MEM_mallocN((totobj + MAXPICKELEMS) * sizeof(GPUSelectResult),
-                                        "selection buffer");
+  GPUSelectResult *buffer = static_cast<GPUSelectResult *>(
+      MEM_mallocN((totobj + MAXPICKELEMS) * sizeof(GPUSelectResult), __func__));
   const eV3DSelectObjectFilter select_filter = ED_view3d_select_filter_from_mode(vc->scene,
                                                                                  vc->obact);
   const int hits = view3d_opengl_select(
@@ -3710,16 +3746,16 @@ static bool do_pose_box_select(bContext *C, ViewContext *vc, rcti *rect, const e
          buf_iter++) {
       Bone *bone;
       Base *base = ED_armature_base_and_bone_from_select_buffer(
-          bases, bases_len, buf_iter->id, &bone);
+          bases.data(), bases.size(), buf_iter->id, &bone);
 
-      if (base == NULL) {
+      if (base == nullptr) {
         continue;
       }
 
       /* Loop over contiguous bone hits for 'base'. */
       for (; buf_iter != buf_end; buf_iter++) {
         /* should never fail */
-        if (bone != NULL) {
+        if (bone != nullptr) {
           base->object->id.tag |= LIB_TAG_DOIT;
           bone->flag |= BONE_DONE;
         }
@@ -3730,28 +3766,26 @@ static bool do_pose_box_select(bContext *C, ViewContext *vc, rcti *rect, const e
           if ((base->object->runtime.select_id & 0x0000FFFF) != (col_next->id & 0x0000FFFF)) {
             break;
           }
-          if (base->object->pose != NULL) {
+          if (base->object->pose != nullptr) {
             const uint hit_bone = (col_next->id & ~BONESEL_ANY) >> 16;
-            bPoseChannel *pchan = BLI_findlink(&base->object->pose->chanbase, hit_bone);
-            bone = pchan ? pchan->bone : NULL;
+            bPoseChannel *pchan = static_cast<bPoseChannel *>(
+                BLI_findlink(&base->object->pose->chanbase, hit_bone));
+            bone = pchan ? pchan->bone : nullptr;
           }
           else {
-            bone = NULL;
+            bone = nullptr;
           }
         }
       }
     }
   }
 
-  const bool changed_multi = do_pose_tag_select_op_exec(bases, bases_len, sel_op);
+  const bool changed_multi = do_pose_tag_select_op_exec(bases, sel_op);
   if (changed_multi) {
     DEG_id_tag_update(&vc->scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, vc->scene);
   }
 
-  if (bases != NULL) {
-    MEM_freeN(bases);
-  }
   MEM_freeN(buffer);
 
   return changed_multi;
@@ -3764,7 +3798,7 @@ static int view3d_box_select_exec(bContext *C, wmOperator *op)
   rcti rect;
   bool changed_multi = false;
 
-  wmGenericUserData wm_userdata_buf = {0};
+  wmGenericUserData wm_userdata_buf = {nullptr, nullptr, false};
   wmGenericUserData *wm_userdata = &wm_userdata_buf;
 
   view3d_operator_needs_opengl(C);
@@ -3773,12 +3807,12 @@ static int view3d_box_select_exec(bContext *C, wmOperator *op)
   /* setup view context for argument to callbacks */
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
 
-  eSelectOp sel_op = RNA_enum_get(op->ptr, "mode");
+  eSelectOp sel_op = static_cast<eSelectOp>(RNA_enum_get(op->ptr, "mode"));
   WM_operator_properties_border_to_rcti(op, &rect);
 
   if (vc.obedit) {
     FOREACH_OBJECT_IN_MODE_BEGIN (
-        vc.view_layer, vc.v3d, vc.obedit->type, vc.obedit->mode, ob_iter) {
+        vc.scene, vc.view_layer, vc.v3d, vc.obedit->type, vc.obedit->mode, ob_iter) {
       ED_view3d_viewcontext_init_object(&vc, ob_iter);
       bool changed = false;
 
@@ -3787,7 +3821,7 @@ static int view3d_box_select_exec(bContext *C, wmOperator *op)
           vc.em = BKE_editmesh_from_object(vc.obedit);
           changed = do_mesh_box_select(&vc, wm_userdata, &rect, sel_op);
           if (changed) {
-            DEG_id_tag_update(vc.obedit->data, ID_RECALC_SELECT);
+            DEG_id_tag_update(static_cast<ID *>(vc.obedit->data), ID_RECALC_SELECT);
             WM_event_add_notifier(C, NC_GEOM | ND_SELECT, vc.obedit->data);
           }
           break;
@@ -3795,14 +3829,14 @@ static int view3d_box_select_exec(bContext *C, wmOperator *op)
         case OB_SURF:
           changed = do_nurbs_box_select(&vc, &rect, sel_op);
           if (changed) {
-            DEG_id_tag_update(vc.obedit->data, ID_RECALC_SELECT);
+            DEG_id_tag_update(static_cast<ID *>(vc.obedit->data), ID_RECALC_SELECT);
             WM_event_add_notifier(C, NC_GEOM | ND_SELECT, vc.obedit->data);
           }
           break;
         case OB_MBALL:
           changed = do_meta_box_select(&vc, &rect, sel_op);
           if (changed) {
-            DEG_id_tag_update(vc.obedit->data, ID_RECALC_SELECT);
+            DEG_id_tag_update(static_cast<ID *>(vc.obedit->data), ID_RECALC_SELECT);
             WM_event_add_notifier(C, NC_GEOM | ND_SELECT, vc.obedit->data);
           }
           break;
@@ -3817,7 +3851,7 @@ static int view3d_box_select_exec(bContext *C, wmOperator *op)
         case OB_LATTICE:
           changed = do_lattice_box_select(&vc, &rect, sel_op);
           if (changed) {
-            DEG_id_tag_update(vc.obedit->data, ID_RECALC_SELECT);
+            DEG_id_tag_update(static_cast<ID *>(vc.obedit->data), ID_RECALC_SELECT);
             WM_event_add_notifier(C, NC_GEOM | ND_SELECT, vc.obedit->data);
           }
           break;
@@ -3889,7 +3923,7 @@ void VIEW3D_OT_select_box(wmOperatorType *ot)
 /** \name Circle Select
  * \{ */
 
-typedef struct CircleSelectUserData {
+struct CircleSelectUserData {
   ViewContext *vc;
   bool select;
   int mval[2];
@@ -3900,7 +3934,7 @@ typedef struct CircleSelectUserData {
 
   /* runtime */
   bool is_changed;
-} CircleSelectUserData;
+};
 
 static void view3d_userdata_circleselect_init(CircleSelectUserData *r_data,
                                               ViewContext *vc,
@@ -3918,7 +3952,7 @@ static void view3d_userdata_circleselect_init(CircleSelectUserData *r_data,
   r_data->radius_squared = rad * rad;
 
   /* SELECT by default, but can be changed if needed (only few cases use and respect this). */
-  r_data->select_flag = SELECT;
+  r_data->select_flag = (eBezTriple_Flag)SELECT;
 
   /* runtime */
   r_data->is_changed = false;
@@ -3929,7 +3963,7 @@ static void mesh_circle_doSelectVert(void *userData,
                                      const float screen_co[2],
                                      int UNUSED(index))
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     BM_vert_select_set(data->vc->em->bm, eve, data->select);
@@ -3942,7 +3976,7 @@ static void mesh_circle_doSelectEdge(void *userData,
                                      const float screen_co_b[2],
                                      int UNUSED(index))
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (edge_inside_circle(data->mval_fl, data->radius, screen_co_a, screen_co_b)) {
     BM_edge_select_set(data->vc->em->bm, eed, data->select);
@@ -3954,7 +3988,7 @@ static void mesh_circle_doSelectFace(void *userData,
                                      const float screen_co[2],
                                      int UNUSED(index))
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     BM_face_select_set(data->vc->em->bm, efa, data->select);
@@ -3991,22 +4025,22 @@ static bool mesh_circle_select(ViewContext *vc,
   const bool use_zbuf = !XRAY_FLAG_ENABLED(vc->v3d);
 
   if (use_zbuf) {
-    if (wm_userdata->data == NULL) {
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, ts->selectmode);
     }
   }
-  struct EditSelectBuf_Cache *esel = wm_userdata->data;
+  EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
 
   if (use_zbuf) {
-    if (esel->select_bitmap == NULL) {
+    if (esel->select_bitmap == nullptr) {
       esel->select_bitmap = DRW_select_buffer_bitmap_from_circle(
-          vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), NULL);
+          vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), nullptr);
     }
   }
 
   if (ts->selectmode & SCE_SELECT_VERTEX) {
     if (use_zbuf) {
-      if (esel->select_bitmap != NULL) {
+      if (esel->select_bitmap != nullptr) {
         changed |= edbm_backbuf_check_and_select_verts(
             esel, vc->depsgraph, vc->obedit, vc->em, select ? SEL_OP_ADD : SEL_OP_SUB);
       }
@@ -4018,7 +4052,7 @@ static bool mesh_circle_select(ViewContext *vc,
 
   if (ts->selectmode & SCE_SELECT_EDGE) {
     if (use_zbuf) {
-      if (esel->select_bitmap != NULL) {
+      if (esel->select_bitmap != nullptr) {
         changed |= edbm_backbuf_check_and_select_edges(
             esel, vc->depsgraph, vc->obedit, vc->em, select ? SEL_OP_ADD : SEL_OP_SUB);
       }
@@ -4034,7 +4068,7 @@ static bool mesh_circle_select(ViewContext *vc,
 
   if (ts->selectmode & SCE_SELECT_FACE) {
     if (use_zbuf) {
-      if (esel->select_bitmap != NULL) {
+      if (esel->select_bitmap != nullptr) {
         changed |= edbm_backbuf_check_and_select_faces(
             esel, vc->depsgraph, vc->obedit, vc->em, select ? SEL_OP_ADD : SEL_OP_SUB);
       }
@@ -4061,7 +4095,7 @@ static bool paint_facesel_circle_select(ViewContext *vc,
 {
   BLI_assert(ELEM(sel_op, SEL_OP_SET, SEL_OP_ADD, SEL_OP_SUB));
   Object *ob = vc->obact;
-  Mesh *me = ob->data;
+  Mesh *me = static_cast<Mesh *>(ob->data);
 
   bool changed = false;
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
@@ -4069,23 +4103,23 @@ static bool paint_facesel_circle_select(ViewContext *vc,
     changed |= paintface_deselect_all_visible(vc->C, ob, SEL_DESELECT, false);
   }
 
-  if (wm_userdata->data == NULL) {
+  if (wm_userdata->data == nullptr) {
     editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_FACE);
   }
 
   {
-    struct EditSelectBuf_Cache *esel = wm_userdata->data;
+    EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
     esel->select_bitmap = DRW_select_buffer_bitmap_from_circle(
-        vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), NULL);
-    if (esel->select_bitmap != NULL) {
+        vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), nullptr);
+    if (esel->select_bitmap != nullptr) {
       changed |= edbm_backbuf_check_and_select_faces_obmode(me, esel, sel_op);
       MEM_freeN(esel->select_bitmap);
-      esel->select_bitmap = NULL;
+      esel->select_bitmap = nullptr;
     }
   }
 
   if (changed) {
-    paintface_flush_flags(vc->C, ob, SELECT);
+    paintface_flush_flags(vc->C, ob, true, false);
   }
   return changed;
 }
@@ -4095,7 +4129,7 @@ static void paint_vertsel_circle_select_doSelectVert(void *userData,
                                                      const float screen_co[2],
                                                      int UNUSED(index))
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     SET_FLAG_FROM_TEST(mv->flag, data->select, SELECT);
@@ -4111,8 +4145,8 @@ static bool paint_vertsel_circle_select(ViewContext *vc,
   BLI_assert(ELEM(sel_op, SEL_OP_SET, SEL_OP_ADD, SEL_OP_SUB));
   const bool use_zbuf = !XRAY_ENABLED(vc->v3d);
   Object *ob = vc->obact;
-  Mesh *me = ob->data;
-  /* CircleSelectUserData data = {NULL}; */ /* UNUSED */
+  Mesh *me = static_cast<Mesh *>(ob->data);
+  /* CircleSelectUserData data = {nullptr}; */ /* UNUSED */
 
   bool changed = false;
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
@@ -4123,19 +4157,19 @@ static bool paint_vertsel_circle_select(ViewContext *vc,
   const bool select = (sel_op != SEL_OP_SUB);
 
   if (use_zbuf) {
-    if (wm_userdata->data == NULL) {
+    if (wm_userdata->data == nullptr) {
       editselect_buf_cache_init_with_generic_userdata(wm_userdata, vc, SCE_SELECT_VERTEX);
     }
   }
 
   if (use_zbuf) {
-    struct EditSelectBuf_Cache *esel = wm_userdata->data;
+    EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
     esel->select_bitmap = DRW_select_buffer_bitmap_from_circle(
-        vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), NULL);
-    if (esel->select_bitmap != NULL) {
+        vc->depsgraph, vc->region, vc->v3d, mval, (int)(rad + 1.0f), nullptr);
+    if (esel->select_bitmap != nullptr) {
       changed |= edbm_backbuf_check_and_select_verts_obmode(me, esel, sel_op);
       MEM_freeN(esel->select_bitmap);
-      esel->select_bitmap = NULL;
+      esel->select_bitmap = nullptr;
     }
   }
   else {
@@ -4167,7 +4201,7 @@ static void nurbscurve_circle_doSelect(void *userData,
                                        bool UNUSED(handles_visible),
                                        const float screen_co[2])
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     if (bp) {
@@ -4215,14 +4249,14 @@ static bool nurbscurve_circle_select(ViewContext *vc,
     data.is_changed |= BKE_nurbList_flag_set_from_flag(nurbs, BEZT_FLAG_TEMP_TAG, SELECT);
   }
 
-  BKE_curve_nurb_vert_active_validate(vc->obedit->data);
+  BKE_curve_nurb_vert_active_validate(static_cast<Curve *>(vc->obedit->data));
 
   return data.is_changed;
 }
 
 static void latticecurve_circle_doSelect(void *userData, BPoint *bp, const float screen_co[2])
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     bp->f1 = data->select ? (bp->f1 | SELECT) : (bp->f1 & ~SELECT);
@@ -4256,7 +4290,7 @@ static bool pchan_circle_doSelectJoint(void *userData,
                                        bPoseChannel *pchan,
                                        const float screen_co[2])
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     if (data->select) {
@@ -4265,17 +4299,17 @@ static bool pchan_circle_doSelectJoint(void *userData,
     else {
       pchan->bone->flag &= ~BONE_SELECTED;
     }
-    return 1;
+    return true;
   }
-  return 0;
+  return false;
 }
 static void do_circle_select_pose__doSelectBone(void *userData,
-                                                struct bPoseChannel *pchan,
+                                                bPoseChannel *pchan,
                                                 const float screen_co_a[2],
                                                 const float screen_co_b[2])
 {
-  CircleSelectUserData *data = userData;
-  bArmature *arm = data->vc->obact->data;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
+  bArmature *arm = static_cast<bArmature *>(data->vc->obact->data);
   if (!PBONE_SELECTABLE(arm, pchan->bone)) {
     return;
   }
@@ -4283,7 +4317,7 @@ static void do_circle_select_pose__doSelectBone(void *userData,
   bool is_point_done = false;
   int points_proj_tot = 0;
 
-  /* project head location to screenspace */
+  /* Project head location to screen-space. */
   if (screen_co_a[0] != IS_CLIPPED) {
     points_proj_tot++;
     if (pchan_circle_doSelectJoint(data, pchan, screen_co_a)) {
@@ -4291,7 +4325,7 @@ static void do_circle_select_pose__doSelectBone(void *userData,
     }
   }
 
-  /* project tail location to screenspace */
+  /* Project tail location to screen-space. */
   if (screen_co_b[0] != IS_CLIPPED) {
     points_proj_tot++;
     if (pchan_circle_doSelectJoint(data, pchan, screen_co_b)) {
@@ -4356,7 +4390,7 @@ static bool armature_circle_doSelectJoint(void *userData,
                                           const float screen_co[2],
                                           bool head)
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     if (head) {
@@ -4375,17 +4409,17 @@ static bool armature_circle_doSelectJoint(void *userData,
         ebone->flag &= ~BONE_TIPSEL;
       }
     }
-    return 1;
+    return true;
   }
-  return 0;
+  return false;
 }
 static void do_circle_select_armature__doSelectBone(void *userData,
-                                                    struct EditBone *ebone,
+                                                    EditBone *ebone,
                                                     const float screen_co_a[2],
                                                     const float screen_co_b[2])
 {
-  CircleSelectUserData *data = userData;
-  const bArmature *arm = data->vc->obedit->data;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
+  const bArmature *arm = static_cast<const bArmature *>(data->vc->obedit->data);
   if (!(data->select ? EBONE_SELECTABLE(arm, ebone) : EBONE_VISIBLE(arm, ebone))) {
     return;
   }
@@ -4397,7 +4431,7 @@ static void do_circle_select_armature__doSelectBone(void *userData,
   bool is_edge_done = false;
   int points_proj_tot = 0;
 
-  /* project head location to screenspace */
+  /* Project head location to screen-space. */
   if (screen_co_a[0] != IS_CLIPPED) {
     points_proj_tot++;
     if (armature_circle_doSelectJoint(data, ebone, screen_co_a, true)) {
@@ -4405,7 +4439,7 @@ static void do_circle_select_armature__doSelectBone(void *userData,
     }
   }
 
-  /* project tail location to screenspace */
+  /* Project tail location to screen-space. */
   if (screen_co_b[0] != IS_CLIPPED) {
     points_proj_tot++;
     if (armature_circle_doSelectJoint(data, ebone, screen_co_b, false)) {
@@ -4434,19 +4468,19 @@ static void do_circle_select_armature__doSelectBone(void *userData,
   data->is_changed |= is_point_done;
 }
 static void do_circle_select_armature__doSelectBone_clip_content(void *userData,
-                                                                 struct EditBone *ebone,
+                                                                 EditBone *ebone,
                                                                  const float screen_co_a[2],
                                                                  const float screen_co_b[2])
 {
-  CircleSelectUserData *data = userData;
-  bArmature *arm = data->vc->obedit->data;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
+  bArmature *arm = static_cast<bArmature *>(data->vc->obedit->data);
 
   if (!(data->select ? EBONE_SELECTABLE(arm, ebone) : EBONE_VISIBLE(arm, ebone))) {
     return;
   }
 
   /* Set in the first pass, needed so circle select prioritizes joints. */
-  if (ebone->temp.i == true) {
+  if (ebone->temp.i != 0) {
     return;
   }
 
@@ -4461,7 +4495,7 @@ static bool armature_circle_select(ViewContext *vc,
                                    float rad)
 {
   CircleSelectUserData data;
-  bArmature *arm = vc->obedit->data;
+  bArmature *arm = static_cast<bArmature *>(vc->obedit->data);
 
   const bool select = (sel_op != SEL_OP_SUB);
 
@@ -4494,10 +4528,10 @@ static bool armature_circle_select(ViewContext *vc,
 }
 
 static void do_circle_select_mball__doSelectElem(void *userData,
-                                                 struct MetaElem *ml,
+                                                 MetaElem *ml,
                                                  const float screen_co[2])
 {
-  CircleSelectUserData *data = userData;
+  CircleSelectUserData *data = static_cast<CircleSelectUserData *>(userData);
 
   if (len_squared_v2v2(data->mval_fl, screen_co) <= data->radius_squared) {
     if (data->select) {
@@ -4521,7 +4555,7 @@ static bool mball_circle_select(ViewContext *vc,
   view3d_userdata_circleselect_init(&data, vc, select, mval, rad);
 
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    data.is_changed |= BKE_mball_deselect_all(vc->obedit->data);
+    data.is_changed |= BKE_mball_deselect_all(static_cast<MetaBall *>(vc->obedit->data));
   }
 
   ED_view3d_init_mats_rv3d(vc->obedit, vc->rv3d);
@@ -4569,7 +4603,7 @@ static bool obedit_circle_select(bContext *C,
   }
 
   if (changed) {
-    DEG_id_tag_update(vc->obact->data, ID_RECALC_SELECT);
+    DEG_id_tag_update(static_cast<ID *>(vc->obact->data), ID_RECALC_SELECT);
     WM_main_add_notifier(NC_GEOM | ND_SELECT, vc->obact->data);
   }
   return changed;
@@ -4581,21 +4615,21 @@ static bool object_circle_select(ViewContext *vc,
                                  float rad)
 {
   BLI_assert(ELEM(sel_op, SEL_OP_SET, SEL_OP_ADD, SEL_OP_SUB));
+  Scene *scene = vc->scene;
   ViewLayer *view_layer = vc->view_layer;
   View3D *v3d = vc->v3d;
 
   const float radius_squared = rad * rad;
-  const float mval_fl[2] = {mval[0], mval[1]};
+  const float mval_fl[2] = {static_cast<float>(mval[0]), static_cast<float>(mval[1])};
 
   bool changed = false;
   if (SEL_OP_USE_PRE_DESELECT(sel_op)) {
-    changed |= object_deselect_all_visible(vc->view_layer, vc->v3d);
+    changed |= object_deselect_all_visible(vc->scene, vc->view_layer, vc->v3d);
   }
   const bool select = (sel_op != SEL_OP_SUB);
   const int select_flag = select ? BASE_SELECTED : 0;
-
-  Base *base;
-  for (base = FIRSTBASE(view_layer); base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_SELECTABLE(v3d, base) && ((base->flag & BASE_SELECTED) != select_flag)) {
       float screen_co[2];
       if (ED_view3d_project_float_global(
@@ -4615,7 +4649,7 @@ static bool object_circle_select(ViewContext *vc,
 /* not a real operator, only for circle test */
 static void view3d_circle_select_recalc(void *user_data)
 {
-  bContext *C = user_data;
+  bContext *C = static_cast<bContext *>(user_data);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   ViewContext vc;
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
@@ -4625,7 +4659,7 @@ static void view3d_circle_select_recalc(void *user_data)
     switch (vc.obedit->type) {
       case OB_MESH: {
         FOREACH_OBJECT_IN_MODE_BEGIN (
-            vc.view_layer, vc.v3d, vc.obact->type, vc.obact->mode, ob_iter) {
+            vc.scene, vc.view_layer, vc.v3d, vc.obact->type, vc.obact->mode, ob_iter) {
           ED_view3d_viewcontext_init_object(&vc, ob_iter);
           BM_mesh_select_mode_flush_ex(
               vc.em->bm, vc.em->selectmode, BM_SELECT_LEN_FLUSH_RECALC_ALL);
@@ -4663,12 +4697,12 @@ static int view3d_circle_select_exec(bContext *C, wmOperator *op)
   const int mval[2] = {RNA_int_get(op->ptr, "x"), RNA_int_get(op->ptr, "y")};
 
   /* Allow each selection type to allocate their own data that's used between executions. */
-  wmGesture *gesture = op->customdata; /* NULL when non-modal. */
-  wmGenericUserData wm_userdata_buf = {0};
+  wmGesture *gesture = static_cast<wmGesture *>(op->customdata); /* nullptr when non-modal. */
+  wmGenericUserData wm_userdata_buf = {nullptr, nullptr, false};
   wmGenericUserData *wm_userdata = gesture ? &gesture->user_data : &wm_userdata_buf;
 
-  const eSelectOp sel_op = ED_select_op_modal(RNA_enum_get(op->ptr, "mode"),
-                                              WM_gesture_is_modal_first(gesture));
+  const eSelectOp sel_op = ED_select_op_modal(
+      static_cast<eSelectOp>(RNA_enum_get(op->ptr, "mode")), WM_gesture_is_modal_first(gesture));
 
   ED_view3d_viewcontext_init(C, &vc, depsgraph);
 
@@ -4677,11 +4711,12 @@ static int view3d_circle_select_exec(bContext *C, wmOperator *op)
 
   if (obedit || BKE_paint_select_elem_test(obact) || (obact && (obact->mode & OB_MODE_POSE))) {
     view3d_operator_needs_opengl(C);
-    if (obedit == NULL) {
+    if (obedit == nullptr) {
       BKE_object_update_select_id(CTX_data_main(C));
     }
 
-    FOREACH_OBJECT_IN_MODE_BEGIN (vc.view_layer, vc.v3d, obact->type, obact->mode, ob_iter) {
+    FOREACH_OBJECT_IN_MODE_BEGIN (
+        vc.scene, vc.view_layer, vc.v3d, obact->type, obact->mode, ob_iter) {
       ED_view3d_viewcontext_init_object(&vc, ob_iter);
 
       obact = vc.obact;
@@ -4729,10 +4764,10 @@ static int view3d_circle_select_exec(bContext *C, wmOperator *op)
     WM_generic_user_data_free(wm_userdata);
   }
   else {
-    struct EditSelectBuf_Cache *esel = wm_userdata->data;
+    EditSelectBuf_Cache *esel = static_cast<EditSelectBuf_Cache *>(wm_userdata->data);
     if (esel && esel->select_bitmap) {
       MEM_freeN(esel->select_bitmap);
-      esel->select_bitmap = NULL;
+      esel->select_bitmap = nullptr;
     }
   }
 
diff --git a/source/blender/editors/space_view3d/view3d_snap.c b/source/blender/editors/space_view3d/view3d_snap.c
index 2f51b2dce3b..a5ecef69ff8 100644
--- a/source/blender/editors/space_view3d/view3d_snap.c
+++ b/source/blender/editors/space_view3d/view3d_snap.c
@@ -69,7 +69,7 @@ static int snap_sel_to_grid_exec(bContext *C, wmOperator *UNUSED(op))
     ViewLayer *view_layer = CTX_data_view_layer(C);
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &objects_len);
+        scene, view_layer, CTX_wm_view3d(C), &objects_len);
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       Object *obedit = objects[ob_index];
 
@@ -111,7 +111,7 @@ static int snap_sel_to_grid_exec(bContext *C, wmOperator *UNUSED(op))
   else if (OBPOSE_FROM_OBACT(obact)) {
     struct KeyingSet *ks = ANIM_get_keyingset_for_autokeying(scene, ANIM_KS_LOCATION_ID);
     uint objects_len = 0;
-    Object **objects_eval = BKE_object_pose_array_get(view_layer_eval, v3d, &objects_len);
+    Object **objects_eval = BKE_object_pose_array_get(scene, view_layer_eval, v3d, &objects_len);
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       Object *ob_eval = objects_eval[ob_index];
       Object *ob = DEG_get_original_object(ob_eval);
@@ -203,7 +203,7 @@ static int snap_sel_to_grid_exec(bContext *C, wmOperator *UNUSED(op))
       BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
       xcs = ED_object_xform_skip_child_container_create();
       ED_object_xform_skip_child_container_item_ensure_from_array(
-          xcs, view_layer, objects, objects_eval_len);
+          xcs, scene, view_layer, objects, objects_eval_len);
       MEM_freeN(objects);
     }
     if (use_transform_data_origin) {
@@ -326,7 +326,7 @@ static bool snap_selected_to_location(bContext *C,
     ViewLayer *view_layer = CTX_data_view_layer(C);
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, v3d, &objects_len);
+        scene, view_layer, v3d, &objects_len);
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       obedit = objects[ob_index];
 
@@ -376,7 +376,7 @@ static bool snap_selected_to_location(bContext *C,
     struct KeyingSet *ks = ANIM_get_keyingset_for_autokeying(scene, ANIM_KS_LOCATION_ID);
     ViewLayer *view_layer = CTX_data_view_layer(C);
     uint objects_len = 0;
-    Object **objects = BKE_object_pose_array_get(view_layer, v3d, &objects_len);
+    Object **objects = BKE_object_pose_array_get(scene, view_layer, v3d, &objects_len);
 
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       Object *ob = objects[ob_index];
@@ -487,7 +487,7 @@ static bool snap_selected_to_location(bContext *C,
       BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
       xcs = ED_object_xform_skip_child_container_create();
       ED_object_xform_skip_child_container_item_ensure_from_array(
-          xcs, view_layer, objects, objects_len);
+          xcs, scene, view_layer, objects, objects_len);
     }
     if (use_transform_data_origin) {
       BKE_scene_graph_evaluated_ensure(depsgraph, bmain);
@@ -789,7 +789,7 @@ static bool snap_curs_to_sel_ex(bContext *C, const int pivot_point, float r_curs
     ViewLayer *view_layer = CTX_data_view_layer(C);
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-        view_layer, CTX_wm_view3d(C), &objects_len);
+        scene, view_layer, CTX_wm_view3d(C), &objects_len);
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       obedit = objects[ob_index];
 
diff --git a/source/blender/editors/space_view3d/view3d_utils.c b/source/blender/editors/space_view3d/view3d_utils.c
index 1fabdef8da2..cb716391fb2 100644
--- a/source/blender/editors/space_view3d/view3d_utils.c
+++ b/source/blender/editors/space_view3d/view3d_utils.c
@@ -44,6 +44,7 @@
 
 #include "ED_keyframing.h"
 #include "ED_screen.h"
+#include "ED_undo.h"
 #include "ED_view3d.h"
 
 #include "UI_resources.h"
@@ -688,6 +689,60 @@ bool ED_view3d_camera_lock_autokey(View3D *v3d,
   return false;
 }
 
+bool ED_view3d_camera_lock_undo_test(const View3D *v3d,
+                                     const RegionView3D *rv3d,
+                                     struct bContext *C)
+{
+  if (ED_view3d_camera_lock_check(v3d, rv3d)) {
+    if (ED_undo_is_memfile_compatible(C)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Create a MEMFILE undo-step for locked camera movement when transforming the view.
+ * Edit and texture paint mode don't use MEMFILE undo so undo push is skipped for them.
+ * NDOF and track-pad navigation would create an undo step on every gesture and we may end up with
+ * unnecessary undo steps so undo push for them is not supported for now.
+ * Operators that use smooth view for navigation are supported via an optional parameter field,
+ * see: #V3D_SmoothParams.undo_str.
+ */
+static bool view3d_camera_lock_undo_ex(const char *str,
+                                       const View3D *v3d,
+                                       const RegionView3D *rv3d,
+                                       struct bContext *C,
+                                       const bool undo_group)
+{
+  if (ED_view3d_camera_lock_undo_test(v3d, rv3d, C)) {
+    if (undo_group) {
+      ED_undo_grouped_push(C, str);
+    }
+    else {
+      ED_undo_push(C, str);
+    }
+    return true;
+  }
+  return false;
+}
+
+bool ED_view3d_camera_lock_undo_push(const char *str,
+                                     const View3D *v3d,
+                                     const RegionView3D *rv3d,
+                                     bContext *C)
+{
+  return view3d_camera_lock_undo_ex(str, v3d, rv3d, C, false);
+}
+
+bool ED_view3d_camera_lock_undo_grouped_push(const char *str,
+                                             const View3D *v3d,
+                                             const RegionView3D *rv3d,
+                                             bContext *C)
+{
+  return view3d_camera_lock_undo_ex(str, v3d, rv3d, C, true);
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -1492,10 +1547,12 @@ static bool view3d_camera_to_view_selected_impl(struct Main *bmain,
           depsgraph, scene, camera_ob_eval, co, &scale, r_clip_start, r_clip_end)) {
     ObjectTfmProtectedChannels obtfm;
     float obmat_new[4][4];
+    bool is_ortho_camera = false;
 
     if ((camera_ob_eval->type == OB_CAMERA) &&
         (((Camera *)camera_ob_eval->data)->type == CAM_ORTHO)) {
       ((Camera *)camera_ob->data)->ortho_scale = scale;
+      is_ortho_camera = true;
     }
 
     copy_m4_m4(obmat_new, camera_ob_eval->obmat);
@@ -1508,6 +1565,9 @@ static bool view3d_camera_to_view_selected_impl(struct Main *bmain,
 
     /* notifiers */
     DEG_id_tag_update_ex(bmain, &camera_ob->id, ID_RECALC_TRANSFORM);
+    if (is_ortho_camera) {
+      DEG_id_tag_update_ex(bmain, camera_ob->data, ID_RECALC_PARAMETERS);
+    }
 
     return true;
   }
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index fc88737ca70..d0db4de0c47 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -202,6 +202,8 @@ static void sync_viewport_camera_smoothview(bContext *C,
                                               .quat = other_rv3d->viewquat,
                                               .dist = &other_rv3d->dist,
                                               .lens = &other_v3d->lens,
+                                              /* No undo because this switches cameras. */
+                                              .undo_str = NULL,
                                           });
                   }
                   else {
@@ -256,6 +258,8 @@ static int view3d_setobjectascamera_exec(bContext *C, wmOperator *op)
                                 .quat = rv3d->viewquat,
                                 .dist = &rv3d->dist,
                                 .lens = &v3d->lens,
+                                /* No undo because this switches cameras. */
+                                .undo_str = NULL,
                             });
     }
 
@@ -549,7 +553,8 @@ int view3d_opengl_select_ex(ViewContext *vc,
   ARegion *region = vc->region;
   rcti rect;
   int hits = 0;
-  const bool use_obedit_skip = (OBEDIT_FROM_VIEW_LAYER(vc->view_layer) != NULL) &&
+  BKE_view_layer_synced_ensure(scene, vc->view_layer);
+  const bool use_obedit_skip = (BKE_view_layer_edit_object_get(vc->view_layer) != NULL) &&
                                (vc->obedit == NULL);
   const bool is_pick_select = (U.gpu_flag & USER_GPU_FLAG_NO_DEPT_PICK) == 0;
   const bool do_passes = ((is_pick_select == false) &&
@@ -597,7 +602,7 @@ int view3d_opengl_select_ex(ViewContext *vc,
     goto finally;
   }
 
-  /* Important to use 'vc->obact', not 'OBACT(vc->view_layer)' below,
+  /* Important to use 'vc->obact', not 'BKE_view_layer_active_object_get(vc->view_layer)' below,
    * so it will be NULL when hidden. */
   struct {
     DRW_ObjectFilterFn fn;
@@ -820,6 +825,7 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
                                   wmWindowManager *wm,
                                   wmWindow *win,
                                   Main *bmain,
+                                  const Scene *scene,
                                   ViewLayer *view_layer,
                                   ScrArea *area,
                                   const bool frame_selected,
@@ -827,7 +833,6 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
                                   ReportList *reports)
 {
   View3D *v3d = area->spacedata.first;
-  Base *base;
   float min[3], max[3], box[3];
   float size = 0.0f;
   uint local_view_bit;
@@ -848,12 +853,14 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
     ok = false;
   }
   else {
-    Object *obedit = OBEDIT_FROM_VIEW_LAYER(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obedit = BKE_view_layer_edit_object_get(view_layer);
     if (obedit) {
-      for (base = FIRSTBASE(view_layer); base; base = base->next) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
         base->local_view_bits &= ~local_view_bit;
       }
-      FOREACH_BASE_IN_EDIT_MODE_BEGIN (view_layer, v3d, base_iter) {
+      FOREACH_BASE_IN_EDIT_MODE_BEGIN (scene, view_layer, v3d, base_iter) {
         BKE_object_minmax(base_iter->object, min, max, false);
         base_iter->local_view_bits |= local_view_bit;
         ok = true;
@@ -861,7 +868,8 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
       FOREACH_BASE_IN_EDIT_MODE_END;
     }
     else {
-      for (base = FIRSTBASE(view_layer); base; base = base->next) {
+      BKE_view_layer_synced_ensure(scene, view_layer);
+      LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
         if (BASE_SELECTED(v3d, base)) {
           BKE_object_minmax(base->object, min, max, false);
           base->local_view_bits |= local_view_bit;
@@ -939,6 +947,8 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
                                      .quat = rv3d->viewquat,
                                      .dist = ok_dist ? &dist_new : NULL,
                                      .lens = &v3d->lens,
+                                     /* No undo because this doesn't move the camera. */
+                                     .undo_str = NULL,
                                  });
       }
     }
@@ -950,6 +960,7 @@ static bool view3d_localview_init(const Depsgraph *depsgraph,
 static void view3d_localview_exit(const Depsgraph *depsgraph,
                                   wmWindowManager *wm,
                                   wmWindow *win,
+                                  const Scene *scene,
                                   ViewLayer *view_layer,
                                   ScrArea *area,
                                   const bool frame_selected,
@@ -960,8 +971,8 @@ static void view3d_localview_exit(const Depsgraph *depsgraph,
   if (v3d->localvd == NULL) {
     return;
   }
-
-  for (Base *base = FIRSTBASE(view_layer); base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->local_view_bits & v3d->local_view_uuid) {
       base->local_view_bits &= ~v3d->local_view_uuid;
     }
@@ -1008,6 +1019,8 @@ static void view3d_localview_exit(const Depsgraph *depsgraph,
                                      .ofs = rv3d->localvd->ofs,
                                      .quat = rv3d->localvd->viewquat,
                                      .dist = &rv3d->localvd->dist,
+                                     /* No undo because this doesn't move the camera. */
+                                     .undo_str = NULL,
                                  });
       }
 
@@ -1032,12 +1045,21 @@ static int localview_exec(bContext *C, wmOperator *op)
   bool changed;
 
   if (v3d->localvd) {
-    view3d_localview_exit(depsgraph, wm, win, view_layer, area, frame_selected, smooth_viewtx);
+    view3d_localview_exit(
+        depsgraph, wm, win, scene, view_layer, area, frame_selected, smooth_viewtx);
     changed = true;
   }
   else {
-    changed = view3d_localview_init(
-        depsgraph, wm, win, bmain, view_layer, area, frame_selected, smooth_viewtx, op->reports);
+    changed = view3d_localview_init(depsgraph,
+                                    wm,
+                                    win,
+                                    bmain,
+                                    scene,
+                                    view_layer,
+                                    area,
+                                    frame_selected,
+                                    smooth_viewtx,
+                                    op->reports);
   }
 
   if (changed) {
@@ -1085,13 +1107,13 @@ static int localview_remove_from_exec(bContext *C, wmOperator *op)
   Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   bool changed = false;
-
-  for (Base *base = FIRSTBASE(view_layer); base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (BASE_SELECTED(v3d, base)) {
       base->local_view_bits &= ~v3d->local_view_uuid;
       ED_object_base_select(base, BA_DESELECT);
 
-      if (base == BASACT(view_layer)) {
+      if (base == view_layer->basact) {
         view_layer->basact = NULL;
       }
       changed = true;
@@ -1258,7 +1280,7 @@ void ED_view3d_local_collections_reset(struct bContext *C, const bool reset_all)
   else if (reset_all && (do_reset || (local_view_bit != ~(0)))) {
     view3d_local_collections_reset(bmain, ~(0));
     View3D v3d = {.local_collections_uuid = ~(0)};
-    BKE_layer_collection_local_sync(CTX_data_view_layer(C), &v3d);
+    BKE_layer_collection_local_sync(CTX_data_scene(C), CTX_data_view_layer(C), &v3d);
     DEG_id_tag_update(&CTX_data_scene(C)->id, ID_RECALC_BASE_FLAGS);
   }
 }
diff --git a/source/blender/editors/transform/CMakeLists.txt b/source/blender/editors/transform/CMakeLists.txt
index 68c4f4e76ca..ec6f62e0f5b 100644
--- a/source/blender/editors/transform/CMakeLists.txt
+++ b/source/blender/editors/transform/CMakeLists.txt
@@ -15,7 +15,6 @@ set(INC
   ../../render
   ../../sequencer
   ../../windowmanager
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -39,6 +38,7 @@ set(SRC
   transform_convert_mesh_edge.c
   transform_convert_mesh_skin.c
   transform_convert_mesh_uv.c
+  transform_convert_mesh_vert_cdata.c
   transform_convert_nla.c
   transform_convert_node.c
   transform_convert_object.c
diff --git a/source/blender/editors/transform/transform.c b/source/blender/editors/transform/transform.c
index d9e23b98c66..95aa48efd84 100644
--- a/source/blender/editors/transform/transform.c
+++ b/source/blender/editors/transform/transform.c
@@ -19,6 +19,7 @@
 
 #include "BKE_context.h"
 #include "BKE_editmesh.h"
+#include "BKE_layer.h"
 #include "BKE_mask.h"
 #include "BKE_scene.h"
 
@@ -484,7 +485,9 @@ static void viewRedrawForce(const bContext *C, TransInfo *t)
       /* XXX how to deal with lock? */
       SpaceImage *sima = (SpaceImage *)t->area->spacedata.first;
       if (sima->lock) {
-        WM_event_add_notifier(C, NC_GEOM | ND_DATA, OBEDIT_FROM_VIEW_LAYER(t->view_layer)->data);
+        BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+        WM_event_add_notifier(
+            C, NC_GEOM | ND_DATA, BKE_view_layer_edit_object_get(t->view_layer)->data);
       }
       else {
         ED_area_tag_redraw(t->area);
@@ -525,7 +528,8 @@ static void viewRedrawPost(bContext *C, TransInfo *t)
                                          UVCALC_TRANSFORM_CORRECT_SLIDE :
                                          UVCALC_TRANSFORM_CORRECT;
 
-    if ((t->data_type == TC_MESH_VERTS) && (t->settings->uvcalc_flag & uvcalc_correct_flag)) {
+    if ((t->data_type == &TransConvertType_Mesh) &&
+        (t->settings->uvcalc_flag & uvcalc_correct_flag)) {
       WM_event_add_notifier(C, NC_GEOM | ND_DATA, NULL);
     }
 
@@ -847,7 +851,7 @@ static bool transform_event_modal_constraint(TransInfo *t, short modal_type)
       return false;
     }
 
-    if (t->data_type == TC_SEQ_IMAGE_DATA) {
+    if (t->data_type == &TransConvertType_SequencerImage) {
       /* Setup the 2d msg string so it writes out the transform space. */
       msg_2d = msg_3d;
 
@@ -1327,7 +1331,7 @@ int transformEvent(TransInfo *t, const wmEvent *event)
     handled = true;
   }
 
-  if (t->redraw && !ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+  if (t->redraw && !ISMOUSE_MOTION(event->type)) {
     WM_window_status_area_tag_redraw(CTX_wm_window(t->context));
   }
 
@@ -1475,7 +1479,8 @@ static void drawTransformPixel(const struct bContext *C, ARegion *region, void *
   if (region == t->region) {
     Scene *scene = t->scene;
     ViewLayer *view_layer = t->view_layer;
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
 
     /* draw auto-key-framing hint in the corner
      * - only draw if enabled (advanced users may be distracted/annoyed),
@@ -1535,7 +1540,8 @@ void saveTransform(bContext *C, TransInfo *t, wmOperator *op)
     if (!(t->options & CTX_NO_PET)) {
       if ((prop = RNA_struct_find_property(op->ptr, "use_proportional_edit")) &&
           !RNA_property_is_set(op->ptr, prop)) {
-        const Object *obact = OBACT(t->view_layer);
+        BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+        const Object *obact = BKE_view_layer_active_object_get(t->view_layer);
 
         if (t->spacetype == SPACE_GRAPH) {
           ts->proportional_fcurve = use_prop_edit;
@@ -1713,11 +1719,17 @@ static void initSnapSpatial(TransInfo *t, float r_snap[2])
     int grid_size = SI_GRID_STEPS_LEN;
     float zoom_factor = ED_space_image_zoom_level(v2d, grid_size);
     float grid_steps[SI_GRID_STEPS_LEN];
+    float grid_steps_y[SI_GRID_STEPS_LEN];
 
-    ED_space_image_grid_steps(sima, grid_steps, grid_size);
+    ED_space_image_grid_steps(sima, grid_steps, grid_steps_y, grid_size);
     /* Snapping value based on what type of grid is used (adaptive-subdividing or custom-grid). */
     r_snap[0] = ED_space_image_increment_snap_value(grid_size, grid_steps, zoom_factor);
     r_snap[1] = r_snap[0] / 2.0f;
+
+    /* TODO: Implement snapping for custom grid sizes with `grid_steps[0] != grid_steps_y[0]`.
+     * r_snap_y[0] = ED_space_image_increment_snap_value(grid_size, grid_steps_y, zoom_factor);
+     * r_snap_y[1] = r_snap_y[0] / 2.0f;
+     */
   }
   else if (t->spacetype == SPACE_CLIP) {
     r_snap[0] = 0.125f;
diff --git a/source/blender/editors/transform/transform.h b/source/blender/editors/transform/transform.h
index 049d1b6a90e..09fc07f57f4 100644
--- a/source/blender/editors/transform/transform.h
+++ b/source/blender/editors/transform/transform.h
@@ -38,6 +38,7 @@ struct ReportList;
 struct Scene;
 struct ScrArea;
 struct SnapObjectContext;
+struct TransConvertTypeInfo;
 struct TransDataContainer;
 struct TransInfo;
 struct TransSnap;
@@ -204,36 +205,6 @@ typedef enum {
   HLP_TRACKBALL = 6,
 } eTHelpline;
 
-typedef enum {
-  TC_NONE = 0,
-  TC_ACTION_DATA,
-  TC_POSE,
-  TC_ARMATURE_VERTS,
-  TC_CURSOR_IMAGE,
-  TC_CURSOR_SEQUENCER,
-  TC_CURSOR_VIEW3D,
-  TC_CURVE_VERTS,
-  TC_GRAPH_EDIT_DATA,
-  TC_GPENCIL,
-  TC_LATTICE_VERTS,
-  TC_MASKING_DATA,
-  TC_MBALL_VERTS,
-  TC_MESH_VERTS,
-  TC_MESH_EDGES,
-  TC_MESH_SKIN,
-  TC_MESH_UV,
-  TC_NLA_DATA,
-  TC_NODE_DATA,
-  TC_OBJECT,
-  TC_OBJECT_TEXSPACE,
-  TC_PAINT_CURVE_VERTS,
-  TC_PARTICLE_VERTS,
-  TC_SCULPT,
-  TC_SEQ_DATA,
-  TC_SEQ_IMAGE_DATA,
-  TC_TRACKING_DATA,
-} eTConvertType;
-
 /** \} */
 
 /* -------------------------------------------------------------------- */
@@ -384,10 +355,12 @@ typedef struct MouseInput {
 
   /** Initial mouse position. */
   int imval[2];
-  bool precision;
-  float precision_factor;
+  float imval_unproj[3];
   float center[2];
   float factor;
+  float precision_factor;
+  bool precision;
+
   /** Additional data, if needed by the particular function. */
   void *data;
 
@@ -518,7 +491,7 @@ typedef struct TransInfo {
   int data_len_all;
 
   /** TODO: It should be a member of #TransDataContainer. */
-  eTConvertType data_type;
+  struct TransConvertTypeInfo *data_type;
 
   /** Current context/options for transform. */
   eTContext options;
@@ -647,6 +620,9 @@ typedef struct TransInfo {
    * value of the input parameter, except when a constrain is entered. */
   float values_final[4];
 
+  /** Cache safe value for constraints that require iteration or are slow to calculate. */
+  float values_inside_constraints[4];
+
   /* Axis members for modes that use an axis separate from the orientation (rotate & shear). */
 
   /** Primary axis, rotate only uses this. */
@@ -685,6 +661,9 @@ typedef struct TransInfo {
 
   /** Typically for mode settings. */
   TransCustomDataContainer custom;
+
+  /* Needed for sculpt transform. */
+  const char *undo_name;
 } TransInfo;
 
 /** \} */
@@ -784,6 +763,7 @@ void applyMouseInput(struct TransInfo *t,
                      struct MouseInput *mi,
                      const int mval[2],
                      float output[3]);
+void transform_input_update(TransInfo *t, const float fac);
 
 void setCustomPoints(TransInfo *t, MouseInput *mi, const int start[2], const int end[2]);
 void setCustomPointsFromDirection(TransInfo *t, MouseInput *mi, const float dir[2]);
@@ -832,6 +812,7 @@ void calculateCenter2D(TransInfo *t);
 void calculateCenterLocal(TransInfo *t, const float center_global[3]);
 
 void calculateCenter(TransInfo *t);
+void tranformViewUpdate(TransInfo *t);
 
 /* API functions for getting center points */
 void calculateCenterBound(TransInfo *t, float r_center[3]);
diff --git a/source/blender/editors/transform/transform_constraints.c b/source/blender/editors/transform/transform_constraints.c
index 658901a6991..d09bd99ef57 100644
--- a/source/blender/editors/transform/transform_constraints.c
+++ b/source/blender/editors/transform/transform_constraints.c
@@ -177,7 +177,7 @@ static void axisProjection(const TransInfo *t,
                            const float in[3],
                            float out[3])
 {
-  float norm[3], vec[3], factor, angle;
+  float vec[3], factor, angle;
   float t_con_center[3];
 
   if (is_zero_v3(in)) {
@@ -214,7 +214,7 @@ static void axisProjection(const TransInfo *t,
   }
   else {
     float v[3];
-    float norm_center[3];
+    float norm[3], norm_center[3];
     float plane[3];
 
     view_vector_calc(t, t_con_center, norm_center);
@@ -337,25 +337,20 @@ static bool isPlaneProjectionViewAligned(const TransInfo *t, const float plane[4
   return fabsf(factor) < eps;
 }
 
-static void planeProjection(const TransInfo *t, const float in[3], float out[3])
+static void planeProjection(const TransInfo *t,
+                            const float plane[3],
+                            const float in[3],
+                            float out[3])
 {
-  float vec[3], factor, norm[3];
 
-  add_v3_v3v3(vec, in, t->center_global);
-  view_vector_calc(t, vec, norm);
+  float pos[3], view_vec[3], factor;
 
-  sub_v3_v3v3(vec, out, in);
+  add_v3_v3v3(pos, in, t->center_global);
+  view_vector_calc(t, pos, view_vec);
 
-  factor = dot_v3v3(vec, norm);
-  if (factor == 0.0f) {
-    return; /* prevent divide by zero */
+  if (isect_ray_plane_v3(pos, view_vec, plane, &factor, false)) {
+    madd_v3_v3v3fl(out, in, view_vec, factor);
   }
-  factor = dot_v3v3(vec, vec) / factor;
-
-  copy_v3_v3(vec, norm);
-  mul_v3_fl(vec, factor);
-
-  add_v3_v3v3(out, in, vec);
 }
 
 static short transform_orientation_or_default(const TransInfo *t)
@@ -397,7 +392,6 @@ static void applyAxisConstraintVec(const TransInfo *t,
   copy_v3_v3(out, in);
   if (!td && t->con.mode & CON_APPLY) {
     bool is_snap_to_point = false, is_snap_to_edge = false, is_snap_to_face = false;
-    mul_m3_v3(t->con.pmtx, out);
 
     if (activeSnap(t)) {
       if (validSnap(t)) {
@@ -410,8 +404,11 @@ static void applyAxisConstraintVec(const TransInfo *t,
       }
     }
 
-    /* With snap points, a projection is alright, no adjustments needed. */
-    if (!is_snap_to_point || is_snap_to_edge || is_snap_to_face) {
+    if (is_snap_to_point) {
+      /* With snap points, a projection is alright, no adjustments needed. */
+      mul_m3_v3(t->con.pmtx, out);
+    }
+    else {
       const int dims = getConstraintSpaceDimension(t);
       if (dims == 2) {
         if (!is_zero_v3(out)) {
@@ -428,7 +425,10 @@ static void applyAxisConstraintVec(const TransInfo *t,
           else {
             /* View alignment correction. */
             if (!isPlaneProjectionViewAligned(t, plane)) {
-              planeProjection(t, in, out);
+              planeProjection(t, plane, in, out);
+            }
+            else {
+              mul_m3_v3(t->con.pmtx, out);
             }
           }
         }
@@ -701,12 +701,12 @@ void setLocalConstraint(TransInfo *t, int mode, const char text[])
   }
 }
 
-void setUserConstraint(TransInfo *t, int mode, const char ftext[])
+void setUserConstraint(TransInfo *t, int mode, const char text_[])
 {
   char text[256];
   const short orientation = transform_orientation_or_default(t);
   const char *spacename = transform_orientations_spacename_get(t, orientation);
-  BLI_snprintf(text, sizeof(text), ftext, spacename);
+  BLI_snprintf(text, sizeof(text), text_, spacename);
 
   switch (orientation) {
     case V3D_ORIENT_LOCAL:
diff --git a/source/blender/editors/transform/transform_constraints.h b/source/blender/editors/transform/transform_constraints.h
index 9182330b729..90a693b089e 100644
--- a/source/blender/editors/transform/transform_constraints.h
+++ b/source/blender/editors/transform/transform_constraints.h
@@ -34,7 +34,7 @@ void setLocalConstraint(TransInfo *t, int mode, const char text[]);
  * `ftext` is a format string passed to #BLI_snprintf. It will add the name of
  * the orientation where %s is (logically).
  */
-void setUserConstraint(TransInfo *t, int mode, const char text[]);
+void setUserConstraint(TransInfo *t, int mode, const char text_[]);
 void drawConstraint(TransInfo *t);
 /**
  * Called from drawview.c, as an extra per-window draw option.
diff --git a/source/blender/editors/transform/transform_convert.c b/source/blender/editors/transform/transform_convert.c
index d9b971c5478..1e29411fe84 100644
--- a/source/blender/editors/transform/transform_convert.c
+++ b/source/blender/editors/transform/transform_convert.c
@@ -479,132 +479,6 @@ TransDataCurveHandleFlags *initTransDataCurveHandles(TransData *td, struct BezTr
 /** \name UV Coordinates
  * \{ */
 
-/**
- * Find the correction for the scaling factor when "Constrain to Bounds" is active.
- * \param numerator: How far the UV boundary (unit square) is from the origin of the scale.
- * \param denominator: How far the AABB is from the origin of the scale.
- * \param scale: Scale parameter to update.
- */
-static void constrain_scale_to_boundary(const float numerator,
-                                        const float denominator,
-                                        float *scale)
-{
-  if (denominator == 0.0f) {
-    /* The origin of the scale is on the edge of the boundary. */
-    if (numerator < 0.0f) {
-      /* Negative scale will wrap around and put us outside the boundary. */
-      *scale = 0.0f; /* Hold at the boundary instead. */
-    }
-    return; /* Nothing else we can do without more info. */
-  }
-
-  const float correction = numerator / denominator;
-  if (correction < 0.0f || !isfinite(correction)) {
-    /* TODO: Correction is negative or invalid, but we lack context to fix `*scale`. */
-    return;
-  }
-
-  if (denominator < 0.0f) {
-    /* Scale origin is outside boundary, only make scale bigger. */
-    if (*scale < correction) {
-      *scale = correction;
-    }
-    return;
-  }
-
-  /* Scale origin is inside boundary, the "regular" case, limit maximum scale. */
-  if (*scale > correction) {
-    *scale = correction;
-  }
-}
-
-bool clipUVTransform(TransInfo *t, float vec[2], const bool resize)
-{
-  bool clipx = true, clipy = true;
-  float min[2], max[2];
-
-  /* Check if the current image in UV editor is a tiled image or not. */
-  const SpaceImage *sima = t->area->spacedata.first;
-  const Image *image = sima->image;
-  const bool is_tiled_image = image && (image->source == IMA_SRC_TILED);
-  /* Stores the coordinates of the closest UDIM tile.
-   * Also acts as an offset to the tile from the origin of UV space. */
-  float base_offset[2] = {0.0f, 0.0f};
-
-  /* If tiled image then constrain to correct/closest UDIM tile, else 0-1 UV space. */
-  if (is_tiled_image) {
-    int nearest_tile_index = BKE_image_find_nearest_tile(image, t->center_global);
-    if (nearest_tile_index != -1) {
-      nearest_tile_index -= 1001;
-      /* Getting coordinates of nearest tile from the tile index. */
-      base_offset[0] = nearest_tile_index % 10;
-      base_offset[1] = nearest_tile_index / 10;
-    }
-  }
-
-  min[0] = min[1] = FLT_MAX;
-  max[0] = max[1] = FLT_MIN;
-
-  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
-
-    TransData *td;
-    int a;
-
-    for (a = 0, td = tc->data; a < tc->data_len; a++, td++) {
-      minmax_v2v2_v2(min, max, td->loc);
-    }
-  }
-
-  if (resize) {
-    /* Assume no change is required. */
-    float scalex = 1.0f;
-    float scaley = 1.0f;
-
-    /* Update U against the left border. */
-    constrain_scale_to_boundary(
-        t->center_global[0] - base_offset[0], t->center_global[0] - min[0], &scalex);
-    /* Now the right border, negated, because `-1.0 / -1.0 = 1.0` */
-    constrain_scale_to_boundary(base_offset[0] + t->aspect[0] - t->center_global[0],
-                                max[0] - t->center_global[0],
-                                &scalex);
-
-    /* Do the same for the V co-ordinate, which is called `y`. */
-    constrain_scale_to_boundary(
-        t->center_global[1] - base_offset[1], t->center_global[1] - min[1], &scaley);
-    constrain_scale_to_boundary(base_offset[1] + t->aspect[1] - t->center_global[1],
-                                max[1] - t->center_global[1],
-                                &scaley);
-
-    clipx = (scalex != 1.0f);
-    clipy = (scaley != 1.0f);
-    vec[0] *= scalex;
-    vec[1] *= scaley;
-  }
-  else {
-    if (min[0] < base_offset[0]) {
-      vec[0] += base_offset[0] - min[0];
-    }
-    else if (max[0] > base_offset[0] + t->aspect[0]) {
-      vec[0] -= max[0] - base_offset[0] - t->aspect[0];
-    }
-    else {
-      clipx = 0;
-    }
-
-    if (min[1] < base_offset[1]) {
-      vec[1] += base_offset[1] - min[1];
-    }
-    else if (max[1] > base_offset[1] + t->aspect[1]) {
-      vec[1] -= max[1] - base_offset[1] - t->aspect[1];
-    }
-    else {
-      clipy = 0;
-    }
-  }
-
-  return (clipx || clipy);
-}
-
 void clipUVData(TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
@@ -769,7 +643,7 @@ void posttrans_fcurve_clean(FCurve *fcu, const int sel_flag, const bool use_hand
           }
           else {
             /* Delete Keyframe */
-            delete_fcurve_key(fcu, i, 0);
+            BKE_fcurve_delete_key(fcu, i);
           }
 
           /* Update count of how many we've deleted
@@ -779,7 +653,7 @@ void posttrans_fcurve_clean(FCurve *fcu, const int sel_flag, const bool use_hand
         }
         else {
           /* Always delete - Unselected keys don't matter */
-          delete_fcurve_key(fcu, i, 0);
+          BKE_fcurve_delete_key(fcu, i);
         }
 
         /* Stop the RK search... we've found our match now */
@@ -902,62 +776,12 @@ void special_aftertrans_update(bContext *C, TransInfo *t)
     return;
   }
 
-  BLI_assert(CTX_data_main(t->context) == CTX_data_main(C));
-  switch (t->data_type) {
-    case TC_ACTION_DATA:
-      special_aftertrans_update__actedit(C, t);
-      break;
-    case TC_POSE:
-      special_aftertrans_update__pose(C, t);
-      break;
-    case TC_GRAPH_EDIT_DATA:
-      special_aftertrans_update__graph(C, t);
-      break;
-    case TC_MASKING_DATA:
-      special_aftertrans_update__mask(C, t);
-      break;
-    case TC_MESH_VERTS:
-    case TC_MESH_EDGES:
-      special_aftertrans_update__mesh(C, t);
-      break;
-    case TC_NLA_DATA:
-      special_aftertrans_update__nla(C, t);
-      break;
-    case TC_NODE_DATA:
-      special_aftertrans_update__node(C, t);
-      break;
-    case TC_OBJECT:
-      special_aftertrans_update__object(C, t);
-      break;
-    case TC_SCULPT:
-      special_aftertrans_update__sculpt(C, t);
-      break;
-    case TC_SEQ_DATA:
-      special_aftertrans_update__sequencer(C, t);
-      break;
-    case TC_SEQ_IMAGE_DATA:
-      special_aftertrans_update__sequencer_image(C, t);
-      break;
-    case TC_TRACKING_DATA:
-      special_aftertrans_update__movieclip(C, t);
-      break;
-    case TC_ARMATURE_VERTS:
-    case TC_CURSOR_IMAGE:
-    case TC_CURSOR_SEQUENCER:
-    case TC_CURSOR_VIEW3D:
-    case TC_CURVE_VERTS:
-    case TC_GPENCIL:
-    case TC_LATTICE_VERTS:
-    case TC_MBALL_VERTS:
-    case TC_MESH_UV:
-    case TC_MESH_SKIN:
-    case TC_OBJECT_TEXSPACE:
-    case TC_PAINT_CURVE_VERTS:
-    case TC_PARTICLE_VERTS:
-    case TC_NONE:
-    default:
-      break;
+  if (!t->data_type || !t->data_type->special_aftertrans_update) {
+    return;
   }
+
+  BLI_assert(CTX_data_main(t->context) == CTX_data_main(C));
+  t->data_type->special_aftertrans_update(C, t);
 }
 
 int special_transform_moving(TransInfo *t)
@@ -1018,54 +842,44 @@ static int countAndCleanTransDataContainer(TransInfo *t)
 
 static void init_proportional_edit(TransInfo *t)
 {
-  eTConvertType convert_type = t->data_type;
-  switch (convert_type) {
-    case TC_ACTION_DATA:
-    case TC_CURVE_VERTS:
-    case TC_GRAPH_EDIT_DATA:
-    case TC_GPENCIL:
-    case TC_LATTICE_VERTS:
-    case TC_MASKING_DATA:
-    case TC_MBALL_VERTS:
-    case TC_MESH_VERTS:
-    case TC_MESH_EDGES:
-    case TC_MESH_SKIN:
-    case TC_MESH_UV:
-    case TC_NODE_DATA:
-    case TC_OBJECT:
-    case TC_PARTICLE_VERTS:
-      break;
-    case TC_POSE: /* Disable PET, its not usable in pose mode yet T32444. */
-    case TC_ARMATURE_VERTS:
-    case TC_CURSOR_IMAGE:
-    case TC_CURSOR_SEQUENCER:
-    case TC_CURSOR_VIEW3D:
-    case TC_NLA_DATA:
-    case TC_OBJECT_TEXSPACE:
-    case TC_PAINT_CURVE_VERTS:
-    case TC_SCULPT:
-    case TC_SEQ_DATA:
-    case TC_SEQ_IMAGE_DATA:
-    case TC_TRACKING_DATA:
-    case TC_NONE:
-    default:
-      t->options |= CTX_NO_PET;
-      t->flag &= ~T_PROP_EDIT_ALL;
-      return;
+  /* NOTE: PET is not usable in pose mode yet T32444. */
+  if (!ELEM(t->data_type,
+            &TransConvertType_Action,
+            &TransConvertType_Curve,
+            &TransConvertType_Graph,
+            &TransConvertType_GPencil,
+            &TransConvertType_Lattice,
+            &TransConvertType_Mask,
+            &TransConvertType_MBall,
+            &TransConvertType_Mesh,
+            &TransConvertType_MeshEdge,
+            &TransConvertType_MeshSkin,
+            &TransConvertType_MeshUV,
+            &TransConvertType_MeshVertCData,
+            &TransConvertType_Node,
+            &TransConvertType_Object,
+            &TransConvertType_Particle)) {
+    /* Disable PET */
+    t->options |= CTX_NO_PET;
+    t->flag &= ~T_PROP_EDIT_ALL;
+    return;
   }
 
   if (t->data_len_all && (t->flag & T_PROP_EDIT)) {
-    if (convert_type == TC_OBJECT) {
+    if (t->data_type == &TransConvertType_Object) {
       /* Selected objects are already first, no need to presort. */
     }
     else {
       sort_trans_data_selected_first(t);
     }
 
-    if (ELEM(convert_type, TC_ACTION_DATA, TC_GRAPH_EDIT_DATA)) {
+    if (ELEM(t->data_type, &TransConvertType_Action, &TransConvertType_Graph)) {
       /* Distance has already been set. */
     }
-    else if (ELEM(convert_type, TC_MESH_VERTS, TC_MESH_SKIN)) {
+    else if (ELEM(t->data_type,
+                  &TransConvertType_Mesh,
+                  &TransConvertType_MeshSkin,
+                  &TransConvertType_MeshVertCData)) {
       if (t->flag & T_PROP_CONNECTED) {
         /* Already calculated by transform_convert_mesh_connectivity_distance. */
       }
@@ -1073,10 +887,10 @@ static void init_proportional_edit(TransInfo *t)
         set_prop_dist(t, false);
       }
     }
-    else if (convert_type == TC_MESH_UV && t->flag & T_PROP_CONNECTED) {
+    else if (t->data_type == &TransConvertType_MeshUV && t->flag & T_PROP_CONNECTED) {
       /* Already calculated by uv_set_connectivity_distance. */
     }
-    else if (convert_type == TC_CURVE_VERTS) {
+    else if (t->data_type == &TransConvertType_Curve) {
       BLI_assert(t->obedit_type == OB_CURVES_LEGACY);
       set_prop_dist(t, false);
     }
@@ -1099,44 +913,26 @@ static void init_TransDataContainers(TransInfo *t,
                                      Object **objects,
                                      uint objects_len)
 {
-  switch (t->data_type) {
-    case TC_POSE:
-    case TC_ARMATURE_VERTS:
-    case TC_CURVE_VERTS:
-    case TC_GPENCIL:
-    case TC_LATTICE_VERTS:
-    case TC_MBALL_VERTS:
-    case TC_MESH_VERTS:
-    case TC_MESH_EDGES:
-    case TC_MESH_SKIN:
-    case TC_MESH_UV:
-      break;
-    case TC_ACTION_DATA:
-    case TC_GRAPH_EDIT_DATA:
-    case TC_CURSOR_IMAGE:
-    case TC_CURSOR_SEQUENCER:
-    case TC_CURSOR_VIEW3D:
-    case TC_MASKING_DATA:
-    case TC_NLA_DATA:
-    case TC_NODE_DATA:
-    case TC_OBJECT:
-    case TC_OBJECT_TEXSPACE:
-    case TC_PAINT_CURVE_VERTS:
-    case TC_PARTICLE_VERTS:
-    case TC_SCULPT:
-    case TC_SEQ_DATA:
-    case TC_SEQ_IMAGE_DATA:
-    case TC_TRACKING_DATA:
-    case TC_NONE:
-    default:
-      /* Does not support Multi object editing. */
-      return;
+  if (!ELEM(t->data_type,
+            &TransConvertType_Pose,
+            &TransConvertType_EditArmature,
+            &TransConvertType_Curve,
+            &TransConvertType_GPencil,
+            &TransConvertType_Lattice,
+            &TransConvertType_MBall,
+            &TransConvertType_Mesh,
+            &TransConvertType_MeshEdge,
+            &TransConvertType_MeshSkin,
+            &TransConvertType_MeshUV,
+            &TransConvertType_MeshVertCData)) {
+    /* Does not support Multi object editing. */
+    return;
   }
 
   const eObjectMode object_mode = obact ? obact->mode : OB_MODE_OBJECT;
   const short object_type = obact ? obact->type : -1;
 
-  if ((object_mode & OB_MODE_EDIT) || (t->data_type == TC_GPENCIL) ||
+  if ((object_mode & OB_MODE_EDIT) || (t->data_type == &TransConvertType_GPencil) ||
       ((object_mode & OB_MODE_POSE) && (object_type == OB_ARMATURE))) {
     if (t->data_container) {
       MEM_freeN(t->data_container);
@@ -1144,15 +940,16 @@ static void init_TransDataContainers(TransInfo *t,
 
     bool free_objects = false;
     if (objects == NULL) {
-      objects = BKE_view_layer_array_from_objects_in_mode(
+      struct ObjectsInModeParams params = {0};
+      params.object_mode = object_mode;
+      /* Pose transform operates on `ob->pose` so don't skip duplicate object-data. */
+      params.no_dup_data = (object_mode & OB_MODE_POSE) == 0;
+      objects = BKE_view_layer_array_from_objects_in_mode_params(
+          t->scene,
           t->view_layer,
           (t->spacetype == SPACE_VIEW3D) ? t->view : NULL,
           &objects_len,
-          {
-              .object_mode = object_mode,
-              /* Pose transform operates on `ob->pose` so don't skip duplicate object-data. */
-              .no_dup_data = (object_mode & OB_MODE_POSE) == 0,
-          });
+          &params);
       free_objects = true;
     }
 
@@ -1178,7 +975,7 @@ static void init_TransDataContainers(TransInfo *t,
         tc->poseobj = objects[i];
         tc->use_local_mat = true;
       }
-      else if (t->data_type == TC_GPENCIL) {
+      else if (t->data_type == &TransConvertType_GPencil) {
         tc->use_local_mat = true;
       }
 
@@ -1201,173 +998,132 @@ static void init_TransDataContainers(TransInfo *t,
   }
 }
 
-static eTFlag flags_from_data_type(eTConvertType data_type)
-{
-  switch (data_type) {
-    case TC_ACTION_DATA:
-    case TC_GRAPH_EDIT_DATA:
-    case TC_MASKING_DATA:
-    case TC_NLA_DATA:
-    case TC_NODE_DATA:
-    case TC_PAINT_CURVE_VERTS:
-    case TC_SEQ_DATA:
-    case TC_SEQ_IMAGE_DATA:
-    case TC_TRACKING_DATA:
-      return T_POINTS | T_2D_EDIT;
-    case TC_ARMATURE_VERTS:
-    case TC_CURVE_VERTS:
-    case TC_GPENCIL:
-    case TC_LATTICE_VERTS:
-    case TC_MBALL_VERTS:
-    case TC_MESH_VERTS:
-    case TC_MESH_SKIN:
-      return T_EDIT | T_POINTS;
-    case TC_MESH_EDGES:
-      return T_EDIT;
-    case TC_MESH_UV:
-      return T_EDIT | T_POINTS | T_2D_EDIT;
-    case TC_CURSOR_IMAGE:
-    case TC_CURSOR_SEQUENCER:
-      return T_2D_EDIT;
-    case TC_PARTICLE_VERTS:
-      return T_POINTS;
-    case TC_POSE:
-    case TC_CURSOR_VIEW3D:
-    case TC_OBJECT:
-    case TC_OBJECT_TEXSPACE:
-    case TC_SCULPT:
-    case TC_NONE:
-    default:
-      break;
-  }
-  return 0;
-}
-
-static eTConvertType convert_type_get(const TransInfo *t, Object **r_obj_armature)
+static TransConvertTypeInfo *convert_type_get(const TransInfo *t, Object **r_obj_armature)
 {
   ViewLayer *view_layer = t->view_layer;
-  Object *ob = OBACT(view_layer);
-  eTConvertType convert_type = TC_NONE;
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
 
   /* if tests must match recalcData for correct updates */
   if (t->options & CTX_CURSOR) {
     if (t->spacetype == SPACE_IMAGE) {
-      convert_type = TC_CURSOR_IMAGE;
-    }
-    else if (t->spacetype == SPACE_SEQ) {
-      convert_type = TC_CURSOR_SEQUENCER;
+      return &TransConvertType_CursorImage;
     }
-    else {
-      convert_type = TC_CURSOR_VIEW3D;
+
+    if (t->spacetype == SPACE_SEQ) {
+      return &TransConvertType_CursorSequencer;
     }
+
+    return &TransConvertType_Cursor3D;
   }
-  else if (!(t->options & CTX_PAINT_CURVE) && (t->spacetype == SPACE_VIEW3D) && ob &&
-           (ob->mode == OB_MODE_SCULPT) && ob->sculpt) {
-    convert_type = TC_SCULPT;
+  if (!(t->options & CTX_PAINT_CURVE) && (t->spacetype == SPACE_VIEW3D) && ob &&
+      (ob->mode == OB_MODE_SCULPT) && ob->sculpt) {
+    return &TransConvertType_Sculpt;
   }
-  else if (t->options & CTX_TEXTURE_SPACE) {
-    convert_type = TC_OBJECT_TEXSPACE;
+  if (t->options & CTX_TEXTURE_SPACE) {
+    return &TransConvertType_ObjectTexSpace;
   }
-  else if (t->options & CTX_EDGE_DATA) {
-    convert_type = TC_MESH_EDGES;
+  if (t->options & CTX_EDGE_DATA) {
+    return &TransConvertType_MeshEdge;
   }
-  else if (t->options & CTX_GPENCIL_STROKES) {
-    convert_type = TC_GPENCIL;
+  if (t->options & CTX_GPENCIL_STROKES) {
+    return &TransConvertType_GPencil;
   }
-  else if (t->spacetype == SPACE_IMAGE) {
+  if (t->spacetype == SPACE_IMAGE) {
     if (t->options & CTX_MASK) {
-      convert_type = TC_MASKING_DATA;
+      return &TransConvertType_Mask;
     }
-    else if (t->options & CTX_PAINT_CURVE) {
+    if (t->options & CTX_PAINT_CURVE) {
       if (!ELEM(t->mode, TFM_SHEAR, TFM_SHRINKFATTEN)) {
-        convert_type = TC_PAINT_CURVE_VERTS;
+        return &TransConvertType_PaintCurve;
       }
     }
     else if (t->obedit_type == OB_MESH) {
-      convert_type = TC_MESH_UV;
+      return &TransConvertType_MeshUV;
     }
+    return NULL;
   }
-  else if (t->spacetype == SPACE_ACTION) {
-    convert_type = TC_ACTION_DATA;
+  if (t->spacetype == SPACE_ACTION) {
+    return &TransConvertType_Action;
   }
-  else if (t->spacetype == SPACE_NLA) {
-    convert_type = TC_NLA_DATA;
+  if (t->spacetype == SPACE_NLA) {
+    return &TransConvertType_NLA;
   }
-  else if (t->spacetype == SPACE_SEQ) {
+  if (t->spacetype == SPACE_SEQ) {
     if (t->options & CTX_SEQUENCER_IMAGE) {
-      convert_type = TC_SEQ_IMAGE_DATA;
-    }
-    else {
-      convert_type = TC_SEQ_DATA;
+      return &TransConvertType_SequencerImage;
     }
+    return &TransConvertType_Sequencer;
   }
-  else if (t->spacetype == SPACE_GRAPH) {
-    convert_type = TC_GRAPH_EDIT_DATA;
+  if (t->spacetype == SPACE_GRAPH) {
+    return &TransConvertType_Graph;
   }
-  else if (t->spacetype == SPACE_NODE) {
-    convert_type = TC_NODE_DATA;
+  if (t->spacetype == SPACE_NODE) {
+    return &TransConvertType_Node;
   }
-  else if (t->spacetype == SPACE_CLIP) {
+  if (t->spacetype == SPACE_CLIP) {
     if (t->options & CTX_MOVIECLIP) {
-      convert_type = TC_TRACKING_DATA;
+      return &TransConvertType_Tracking;
     }
-    else if (t->options & CTX_MASK) {
-      convert_type = TC_MASKING_DATA;
+    if (t->options & CTX_MASK) {
+      return &TransConvertType_Mask;
     }
+    return NULL;
   }
-  else if (t->obedit_type != -1) {
+  if (t->obedit_type != -1) {
     if (t->obedit_type == OB_MESH) {
       if (t->mode == TFM_SKIN_RESIZE) {
-        convert_type = TC_MESH_SKIN;
+        return &TransConvertType_MeshSkin;
       }
-      else {
-        convert_type = TC_MESH_VERTS;
+      if (ELEM(t->mode, TFM_BWEIGHT, TFM_VERT_CREASE)) {
+        return &TransConvertType_MeshVertCData;
       }
+      return &TransConvertType_Mesh;
     }
-    else if (ELEM(t->obedit_type, OB_CURVES_LEGACY, OB_SURF)) {
-      convert_type = TC_CURVE_VERTS;
+    if (ELEM(t->obedit_type, OB_CURVES_LEGACY, OB_SURF)) {
+      return &TransConvertType_Curve;
     }
-    else if (t->obedit_type == OB_LATTICE) {
-      convert_type = TC_LATTICE_VERTS;
+    if (t->obedit_type == OB_LATTICE) {
+      return &TransConvertType_Lattice;
     }
-    else if (t->obedit_type == OB_MBALL) {
-      convert_type = TC_MBALL_VERTS;
+    if (t->obedit_type == OB_MBALL) {
+      return &TransConvertType_MBall;
     }
-    else if (t->obedit_type == OB_ARMATURE) {
-      convert_type = TC_ARMATURE_VERTS;
+    if (t->obedit_type == OB_ARMATURE) {
+      return &TransConvertType_EditArmature;
     }
+    return NULL;
   }
-  else if (ob && (ob->mode & OB_MODE_POSE)) {
-    convert_type = TC_POSE;
+  if (ob && (ob->mode & OB_MODE_POSE)) {
+    return &TransConvertType_Pose;
   }
-  else if (ob && (ob->mode & OB_MODE_ALL_WEIGHT_PAINT) && !(t->options & CTX_PAINT_CURVE)) {
+  if (ob && (ob->mode & OB_MODE_ALL_WEIGHT_PAINT) && !(t->options & CTX_PAINT_CURVE)) {
     Object *ob_armature = transform_object_deform_pose_armature_get(t, ob);
     if (ob_armature) {
       *r_obj_armature = ob_armature;
-      convert_type = TC_POSE;
+      return &TransConvertType_Pose;
     }
+    return NULL;
   }
-  else if (ob && (ob->mode & OB_MODE_PARTICLE_EDIT) &&
-           PE_start_edit(PE_get_current(t->depsgraph, t->scene, ob))) {
-    convert_type = TC_PARTICLE_VERTS;
+  if (ob && (ob->mode & OB_MODE_PARTICLE_EDIT) &&
+      PE_start_edit(PE_get_current(t->depsgraph, t->scene, ob))) {
+    return &TransConvertType_Particle;
   }
-  else if (ob && (ob->mode & OB_MODE_ALL_PAINT)) {
+  if (ob && (ob->mode & OB_MODE_ALL_PAINT)) {
     if ((t->options & CTX_PAINT_CURVE) && !ELEM(t->mode, TFM_SHEAR, TFM_SHRINKFATTEN)) {
-      convert_type = TC_PAINT_CURVE_VERTS;
+      return &TransConvertType_PaintCurve;
     }
+    return NULL;
   }
-  else if ((ob) && (ELEM(ob->mode,
-                         OB_MODE_PAINT_GPENCIL,
-                         OB_MODE_SCULPT_GPENCIL,
-                         OB_MODE_WEIGHT_GPENCIL,
-                         OB_MODE_VERTEX_GPENCIL))) {
+  if ((ob) && (ELEM(ob->mode,
+                    OB_MODE_PAINT_GPENCIL,
+                    OB_MODE_SCULPT_GPENCIL,
+                    OB_MODE_WEIGHT_GPENCIL,
+                    OB_MODE_VERTEX_GPENCIL))) {
     /* In grease pencil all transformations must be canceled if not Object or Edit. */
+    return NULL;
   }
-  else {
-    convert_type = TC_OBJECT;
-  }
-
-  return convert_type;
+  return &TransConvertType_Object;
 }
 
 void createTransData(bContext *C, TransInfo *t)
@@ -1376,133 +1132,64 @@ void createTransData(bContext *C, TransInfo *t)
 
   Object *ob_armature = NULL;
   t->data_type = convert_type_get(t, &ob_armature);
-  t->flag |= flags_from_data_type(t->data_type);
+  if (t->data_type == NULL) {
+    printf("edit type not implemented!\n");
+    BLI_assert(t->data_len_all == -1);
+    t->data_len_all = 0;
+    return;
+  }
+
+  t->flag |= t->data_type->flags;
 
   if (ob_armature) {
     init_TransDataContainers(t, ob_armature, &ob_armature, 1);
   }
   else {
-    ViewLayer *view_layer = t->view_layer;
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    Object *ob = BKE_view_layer_active_object_get(t->view_layer);
     init_TransDataContainers(t, ob, NULL, 0);
   }
 
-  switch (t->data_type) {
-    case TC_ACTION_DATA:
-      createTransActionData(C, t);
-      break;
-    case TC_POSE:
-      t->options |= CTX_POSE_BONE;
+  if (t->data_type == &TransConvertType_Object) {
+    t->options |= CTX_OBJECT;
 
-      /* XXX active-layer checking isn't done
-       * as that should probably be checked through context instead. */
-      createTransPose(t);
-      break;
-    case TC_ARMATURE_VERTS:
-      createTransArmatureVerts(t);
-      break;
-    case TC_CURSOR_IMAGE:
-      createTransCursor_image(t);
-      break;
-    case TC_CURSOR_SEQUENCER:
-      createTransCursor_sequencer(t);
-      break;
-    case TC_CURSOR_VIEW3D:
-      createTransCursor_view3d(t);
-      break;
-    case TC_CURVE_VERTS:
-      createTransCurveVerts(t);
-      break;
-    case TC_GRAPH_EDIT_DATA:
-      createTransGraphEditData(C, t);
-      break;
-    case TC_GPENCIL:
-      createTransGPencil(C, t);
-      break;
-    case TC_LATTICE_VERTS:
-      createTransLatticeVerts(t);
-      break;
-    case TC_MASKING_DATA:
-      createTransMaskingData(C, t);
-      break;
-    case TC_MBALL_VERTS:
-      createTransMBallVerts(t);
-      break;
-    case TC_MESH_VERTS:
-      createTransEditVerts(t);
-      break;
-    case TC_MESH_EDGES:
-      createTransEdge(t);
-      break;
-    case TC_MESH_SKIN:
-      createTransMeshSkin(t);
-      break;
-    case TC_MESH_UV:
-      createTransUVs(C, t);
-      break;
-    case TC_NLA_DATA:
-      createTransNlaData(C, t);
-      break;
-    case TC_NODE_DATA:
-      createTransNodeData(t);
-      break;
-    case TC_OBJECT:
-      t->options |= CTX_OBJECT;
-
-      /* Needed for correct Object.obmat after duplication, see: T62135. */
-      BKE_scene_graph_evaluated_ensure(t->depsgraph, CTX_data_main(t->context));
-
-      if ((t->settings->transform_flag & SCE_XFORM_DATA_ORIGIN) != 0) {
-        t->options |= CTX_OBMODE_XFORM_OBDATA;
-      }
-      if ((t->settings->transform_flag & SCE_XFORM_SKIP_CHILDREN) != 0) {
-        t->options |= CTX_OBMODE_XFORM_SKIP_CHILDREN;
-      }
-      createTransObject(C, t);
-      /* Check if we're transforming the camera from the camera */
-      if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
-        View3D *v3d = t->view;
-        RegionView3D *rv3d = t->region->regiondata;
-        if ((rv3d->persp == RV3D_CAMOB) && v3d->camera) {
-          /* we could have a flag to easily check an object is being transformed */
-          if (v3d->camera->id.tag & LIB_TAG_DOIT) {
-            t->options |= CTX_CAMERA;
-          }
-        }
-        else if (v3d->ob_center && v3d->ob_center->id.tag & LIB_TAG_DOIT) {
+    /* Needed for correct Object.obmat after duplication, see: T62135. */
+    BKE_scene_graph_evaluated_ensure(t->depsgraph, CTX_data_main(t->context));
+
+    if ((t->settings->transform_flag & SCE_XFORM_DATA_ORIGIN) != 0) {
+      t->options |= CTX_OBMODE_XFORM_OBDATA;
+    }
+    if ((t->settings->transform_flag & SCE_XFORM_SKIP_CHILDREN) != 0) {
+      t->options |= CTX_OBMODE_XFORM_SKIP_CHILDREN;
+    }
+    TransConvertType_Object.createTransData(C, t);
+    /* Check if we're transforming the camera from the camera */
+    if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
+      View3D *v3d = t->view;
+      RegionView3D *rv3d = t->region->regiondata;
+      if ((rv3d->persp == RV3D_CAMOB) && v3d->camera) {
+        /* we could have a flag to easily check an object is being transformed */
+        if (v3d->camera->id.tag & LIB_TAG_DOIT) {
           t->options |= CTX_CAMERA;
         }
       }
-      break;
-    case TC_OBJECT_TEXSPACE:
-      createTransTexspace(t);
-      break;
-    case TC_PAINT_CURVE_VERTS:
-      createTransPaintCurveVerts(C, t);
-      break;
-    case TC_PARTICLE_VERTS:
-      createTransParticleVerts(t);
-      break;
-    case TC_SCULPT:
-      createTransSculpt(C, t);
-      break;
-    case TC_SEQ_DATA:
-      t->num.flag |= NUM_NO_FRACTION; /* sequencer has no use for floating point transform. */
-      createTransSeqData(t);
-      break;
-    case TC_SEQ_IMAGE_DATA:
+      else if (v3d->ob_center && v3d->ob_center->id.tag & LIB_TAG_DOIT) {
+        t->options |= CTX_CAMERA;
+      }
+    }
+  }
+  else {
+    if (t->data_type == &TransConvertType_Pose) {
+      t->options |= CTX_POSE_BONE;
+    }
+    else if (t->data_type == &TransConvertType_Sequencer) {
+      /* Sequencer has no use for floating point transform. */
+      t->num.flag |= NUM_NO_FRACTION;
+    }
+    else if (t->data_type == &TransConvertType_SequencerImage) {
       t->obedit_type = -1;
-      createTransSeqImageData(t);
-      break;
-    case TC_TRACKING_DATA:
-      createTransTrackingData(C, t);
-      break;
-    case TC_NONE:
-    default:
-      printf("edit type not implemented!\n");
-      BLI_assert(t->data_len_all == -1);
-      t->data_len_all = 0;
-      return;
+    }
+    t->data_type->createTransData(C, t);
   }
 
   countAndCleanTransDataContainer(t);
@@ -1706,89 +1393,10 @@ void transform_convert_flush_handle2D(TransData *td, TransData2D *td2d, const fl
 
 void recalcData(TransInfo *t)
 {
-  switch (t->data_type) {
-    case TC_ACTION_DATA:
-      recalcData_actedit(t);
-      break;
-    case TC_POSE:
-      recalcData_pose(t);
-      break;
-    case TC_ARMATURE_VERTS:
-      recalcData_edit_armature(t);
-      break;
-    case TC_CURVE_VERTS:
-      recalcData_curve(t);
-      break;
-    case TC_CURSOR_IMAGE:
-      recalcData_cursor_image(t);
-      break;
-    case TC_CURSOR_SEQUENCER:
-      recalcData_cursor_sequencer(t);
-      break;
-    case TC_CURSOR_VIEW3D:
-      recalcData_cursor_view3d(t);
-      break;
-    case TC_GRAPH_EDIT_DATA:
-      recalcData_graphedit(t);
-      break;
-    case TC_GPENCIL:
-      recalcData_gpencil_strokes(t);
-      break;
-    case TC_MASKING_DATA:
-      recalcData_mask_common(t);
-      break;
-    case TC_MESH_VERTS:
-      recalcData_mesh(t);
-      break;
-    case TC_MESH_EDGES:
-      recalcData_mesh_edge(t);
-      break;
-    case TC_MESH_SKIN:
-      recalcData_mesh_skin(t);
-      break;
-    case TC_MESH_UV:
-      recalcData_uv(t);
-      break;
-    case TC_NLA_DATA:
-      recalcData_nla(t);
-      break;
-    case TC_NODE_DATA:
-      flushTransNodes(t);
-      break;
-    case TC_OBJECT:
-      recalcData_objects(t);
-      break;
-    case TC_OBJECT_TEXSPACE:
-      recalcData_texspace(t);
-      break;
-    case TC_PAINT_CURVE_VERTS:
-      flushTransPaintCurve(t);
-      break;
-    case TC_SCULPT:
-      recalcData_sculpt(t);
-      break;
-    case TC_SEQ_DATA:
-      recalcData_sequencer(t);
-      break;
-    case TC_SEQ_IMAGE_DATA:
-      recalcData_sequencer_image(t);
-      break;
-    case TC_TRACKING_DATA:
-      recalcData_tracking(t);
-      break;
-    case TC_MBALL_VERTS:
-      recalcData_mball(t);
-      break;
-    case TC_LATTICE_VERTS:
-      recalcData_lattice(t);
-      break;
-    case TC_PARTICLE_VERTS:
-      recalcData_particles(t);
-      break;
-    case TC_NONE:
-    default:
-      break;
+  if (!t->data_type || !t->data_type->recalcData) {
+    return;
   }
+  t->data_type->recalcData(t);
 }
 
 /** \} */
diff --git a/source/blender/editors/transform/transform_convert.h b/source/blender/editors/transform/transform_convert.h
index 037fbe26c77..f32bff6dcff 100644
--- a/source/blender/editors/transform/transform_convert.h
+++ b/source/blender/editors/transform/transform_convert.h
@@ -21,6 +21,25 @@ struct TransDataCurveHandleFlags;
 struct TransInfo;
 struct bContext;
 
+typedef struct TransConvertTypeInfo {
+  int flags; /* eTFlag */
+
+  /**
+   * Allocate and initialize `t->data`.
+   */
+  void (*createTransData)(bContext *C, TransInfo *t);
+
+  /**
+   * Force recalculation of data during transformation.
+   */
+  void (*recalcData)(TransInfo *t);
+
+  /**
+   * Called when the operation is finished.
+   */
+  void (*special_aftertrans_update)(bContext *C, TransInfo *t);
+} TransConvertTypeInfo;
+
 /* transform_convert.c */
 
 /**
@@ -34,7 +53,6 @@ int special_transform_moving(TransInfo *t);
 void special_aftertrans_update(struct bContext *C, TransInfo *t);
 void sort_trans_data_dist(TransInfo *t);
 void createTransData(struct bContext *C, TransInfo *t);
-bool clipUVTransform(TransInfo *t, float vec[2], bool resize);
 void clipUVData(TransInfo *t);
 void transform_convert_flush_handle2D(TransData *td, TransData2D *td2d, float y_fac);
 /**
@@ -99,82 +117,53 @@ void animrecord_check_state(TransInfo *t, struct ID *id);
 
 /* transform_convert_action.c */
 
-void createTransActionData(bContext *C, TransInfo *t);
-/* helper for recalcData() - for Action Editor transforms */
-void recalcData_actedit(TransInfo *t);
-void special_aftertrans_update__actedit(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Action;
 
 /* transform_convert_armature.c */
 
+extern TransConvertTypeInfo TransConvertType_EditArmature;
+extern TransConvertTypeInfo TransConvertType_Pose;
+
 /**
  * Sets transform flags in the bones.
  * Returns total number of bones with #BONE_TRANSFORM.
  */
 void transform_convert_pose_transflags_update(Object *ob, int mode, short around);
 
-/**
- * When objects array is NULL, use 't->data_container' as is.
- */
-void createTransPose(TransInfo *t);
-void createTransArmatureVerts(TransInfo *t);
-void recalcData_edit_armature(TransInfo *t);
-void recalcData_pose(TransInfo *t);
-void special_aftertrans_update__pose(bContext *C, TransInfo *t);
-
 /* transform_convert_cursor.c */
 
-void createTransCursor_image(TransInfo *t);
-void createTransCursor_sequencer(TransInfo *t);
-void createTransCursor_view3d(TransInfo *t);
-void recalcData_cursor_image(TransInfo *t);
-void recalcData_cursor_sequencer(TransInfo *t);
-void recalcData_cursor_view3d(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_CursorImage;
+extern TransConvertTypeInfo TransConvertType_CursorSequencer;
+extern TransConvertTypeInfo TransConvertType_Cursor3D;
 
 /* transform_convert_curve.c */
 
-void createTransCurveVerts(TransInfo *t);
-void recalcData_curve(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Curve;
 
 /* transform_convert_graph.c */
 
-/**
- * It is important to note that this doesn't always act on the selection (like it's usually done),
- * it acts on a subset of it. E.g. the selection code may leave a hint that we just dragged on a
- * left or right handle (SIPO_RUNTIME_FLAG_TWEAK_HANDLES_LEFT/RIGHT) and then we only transform the
- * selected left or right handles accordingly.
- * The points to be transformed are tagged with BEZT_FLAG_TEMP_TAG; some lower level curve
- * functions may need to be made aware of this. It's ugly that these act based on selection state
- * anyway.
- */
-void createTransGraphEditData(bContext *C, TransInfo *t);
-/* helper for recalcData() - for Graph Editor transforms */
-void recalcData_graphedit(TransInfo *t);
-void special_aftertrans_update__graph(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Graph;
 
 /* transform_convert_gpencil.c */
 
-void createTransGPencil(bContext *C, TransInfo *t);
-/* force recalculation of triangles during transformation */
-void recalcData_gpencil_strokes(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_GPencil;
 
 /* transform_convert_lattice.c */
 
-void createTransLatticeVerts(TransInfo *t);
-void recalcData_lattice(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Lattice;
 
 /* transform_convert_mask.c */
 
-void createTransMaskingData(bContext *C, TransInfo *t);
-void recalcData_mask_common(TransInfo *t);
-void special_aftertrans_update__mask(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Mask;
 
 /* transform_convert_mball.c */
 
-void createTransMBallVerts(TransInfo *t);
-void recalcData_mball(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_MBall;
 
 /* transform_convert_mesh.c */
 
+extern TransConvertTypeInfo TransConvertType_Mesh;
+
 struct TransIslandData {
   float (*center)[3];
   float (*axismtx)[3][3];
@@ -233,84 +222,60 @@ void transform_convert_mesh_crazyspace_transdata_set(const float mtx[3][3],
                                                      struct TransData *r_td);
 void transform_convert_mesh_crazyspace_free(struct TransMeshDataCrazySpace *r_crazyspace_data);
 
-void createTransEditVerts(TransInfo *t);
-void recalcData_mesh(TransInfo *t);
 void special_aftertrans_update__mesh(bContext *C, TransInfo *t);
 
 /* transform_convert_mesh_edge.c */
 
-void createTransEdge(TransInfo *t);
-void recalcData_mesh_edge(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_MeshEdge;
 
 /* transform_convert_mesh_skin.c */
 
-void createTransMeshSkin(TransInfo *t);
-void recalcData_mesh_skin(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_MeshSkin;
 
 /* transform_convert_mesh_uv.c */
 
-void createTransUVs(bContext *C, TransInfo *t);
-/* helper for recalcData() - for Image Editor transforms */
-void recalcData_uv(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_MeshUV;
+
+/* transform_convert_mesh_vert_cdata.c */
+
+extern TransConvertTypeInfo TransConvertType_MeshVertCData;
 
 /* transform_convert_nla.c */
 
-void createTransNlaData(bContext *C, TransInfo *t);
-/* helper for recalcData() - for NLA Editor transforms */
-void recalcData_nla(TransInfo *t);
-void special_aftertrans_update__nla(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_NLA;
 
 /* transform_convert_node.c */
 
-void createTransNodeData(TransInfo *t);
-void flushTransNodes(TransInfo *t);
-void special_aftertrans_update__node(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Node;
 
 /* transform_convert_object.c */
 
-void createTransObject(bContext *C, TransInfo *t);
-/* helper for recalcData() - for object transforms, typically in the 3D view */
-void recalcData_objects(TransInfo *t);
-void special_aftertrans_update__object(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Object;
 
 /* transform_convert_object_texspace.c */
 
-void createTransTexspace(TransInfo *t);
-/* helper for recalcData() - for object transforms, typically in the 3D view */
-void recalcData_texspace(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_ObjectTexSpace;
 
 /* transform_convert_paintcurve.c */
 
-void createTransPaintCurveVerts(bContext *C, TransInfo *t);
-void flushTransPaintCurve(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_PaintCurve;
 
 /* transform_convert_particle.c */
 
-void createTransParticleVerts(TransInfo *t);
-void recalcData_particles(TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Particle;
 
 /* transform_convert_sculpt.c */
 
-void createTransSculpt(bContext *C, TransInfo *t);
-void recalcData_sculpt(TransInfo *t);
-void special_aftertrans_update__sculpt(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Sculpt;
 
 /* transform_convert_sequencer.c */
 
-void createTransSeqData(TransInfo *t);
-/* helper for recalcData() - for sequencer transforms */
-void recalcData_sequencer(TransInfo *t);
-void special_aftertrans_update__sequencer(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Sequencer;
 
 /* transform_convert_sequencer_image.c */
 
-void createTransSeqImageData(TransInfo *t);
-void recalcData_sequencer_image(TransInfo *t);
-void special_aftertrans_update__sequencer_image(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_SequencerImage;
 
 /* transform_convert_tracking.c */
 
-void createTransTrackingData(bContext *C, TransInfo *t);
-/* helper for recalcData() - for Movie Clip transforms */
-void recalcData_tracking(TransInfo *t);
-void special_aftertrans_update__movieclip(bContext *C, TransInfo *t);
+extern TransConvertTypeInfo TransConvertType_Tracking;
diff --git a/source/blender/editors/transform/transform_convert_action.c b/source/blender/editors/transform/transform_convert_action.c
index 71a78321e12..8c6f2baf84a 100644
--- a/source/blender/editors/transform/transform_convert_action.c
+++ b/source/blender/editors/transform/transform_convert_action.c
@@ -18,6 +18,7 @@
 #include "BKE_context.h"
 #include "BKE_gpencil.h"
 #include "BKE_key.h"
+#include "BKE_layer.h"
 #include "BKE_mask.h"
 #include "BKE_nla.h"
 
@@ -289,7 +290,7 @@ static int MaskLayerToTransData(TransData *td,
   return count;
 }
 
-void createTransActionData(bContext *C, TransInfo *t)
+static void createTransActionData(bContext *C, TransInfo *t)
 {
   Scene *scene = t->scene;
   TransData *td = NULL;
@@ -565,7 +566,7 @@ static void flushTransIntFrameActionData(TransInfo *t)
   }
 }
 
-void recalcData_actedit(TransInfo *t)
+static void recalcData_actedit(TransInfo *t)
 {
   ViewLayer *view_layer = t->view_layer;
   SpaceAction *saction = (SpaceAction *)t->area->spacedata.first;
@@ -575,12 +576,14 @@ void recalcData_actedit(TransInfo *t)
   bAnimListElem *ale;
   int filter;
 
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+
   /* initialize relevant anim-context 'context' data from TransInfo data */
   /* NOTE: sync this with the code in ANIM_animdata_get_context() */
   ac.bmain = CTX_data_main(t->context);
   ac.scene = t->scene;
   ac.view_layer = t->view_layer;
-  ac.obact = OBACT(view_layer);
+  ac.obact = BKE_view_layer_active_object_get(view_layer);
   ac.area = t->area;
   ac.region = t->region;
   ac.sl = (t->area) ? t->area->spacedata.first : NULL;
@@ -759,7 +762,7 @@ static void posttrans_action_clean(bAnimContext *ac, bAction *act)
   ANIM_animdata_freelist(&anim_data);
 }
 
-void special_aftertrans_update__actedit(bContext *C, TransInfo *t)
+static void special_aftertrans_update__actedit(bContext *C, TransInfo *t)
 {
   SpaceAction *saction = (SpaceAction *)t->area->spacedata.first;
   bAnimContext ac;
@@ -901,18 +904,18 @@ void special_aftertrans_update__actedit(bContext *C, TransInfo *t)
         if (ELEM(t->frame_side, 'L', 'R')) { /* TFM_TIME_EXTEND */
           /* same as below */
           ED_markers_post_apply_transform(
-              ED_context_get_markers(C), t->scene, t->mode, t->values[0], t->frame_side);
+              ED_context_get_markers(C), t->scene, t->mode, t->values_final[0], t->frame_side);
         }
         else /* TFM_TIME_TRANSLATE */
 #endif
       {
         ED_markers_post_apply_transform(
-            ED_context_get_markers(C), t->scene, t->mode, t->values[0], t->frame_side);
+            ED_context_get_markers(C), t->scene, t->mode, t->values_final[0], t->frame_side);
       }
     }
     else if (t->mode == TFM_TIME_SCALE) {
       ED_markers_post_apply_transform(
-          ED_context_get_markers(C), t->scene, t->mode, t->values[0], t->frame_side);
+          ED_context_get_markers(C), t->scene, t->mode, t->values_final[0], t->frame_side);
     }
   }
 
@@ -926,3 +929,10 @@ void special_aftertrans_update__actedit(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Action = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransActionData,
+    /* recalcData */ recalcData_actedit,
+    /* special_aftertrans_update */ special_aftertrans_update__actedit,
+};
diff --git a/source/blender/editors/transform/transform_convert_armature.c b/source/blender/editors/transform/transform_convert_armature.c
index 1613218ca29..d83cca15219 100644
--- a/source/blender/editors/transform/transform_convert_armature.c
+++ b/source/blender/editors/transform/transform_convert_armature.c
@@ -701,7 +701,7 @@ static void add_pose_transdata(TransInfo *t, bPoseChannel *pchan, Object *ob, Tr
   td->con = pchan->constraints.first;
 }
 
-void createTransPose(TransInfo *t)
+static void createTransPose(bContext *UNUSED(C), TransInfo *t)
 {
   Main *bmain = CTX_data_main(t->context);
 
@@ -879,7 +879,7 @@ void createTransPose(TransInfo *t)
   }
 }
 
-void createTransArmatureVerts(TransInfo *t)
+static void createTransArmatureVerts(bContext *UNUSED(C), TransInfo *t)
 {
   t->data_len_all = 0;
 
@@ -1189,7 +1189,7 @@ static void restoreBones(TransDataContainer *tc)
   }
 }
 
-void recalcData_edit_armature(TransInfo *t)
+static void recalcData_edit_armature(TransInfo *t)
 {
   if (t->state != TRANS_CANCEL) {
     applySnappingIndividual(t);
@@ -1356,7 +1356,7 @@ static void pose_transform_mirror_update(TransInfo *t, TransDataContainer *tc, O
       }
       mul_v3_m4v3(data->grabtarget, flip_mtx, td->loc);
       if (pid) {
-        /* TODO(germano): Relative Mirror support. */
+        /* TODO(@germano): Relative Mirror support. */
       }
       data->flag |= CONSTRAINT_IK_AUTO;
       /* Add a temporary auto IK constraint here, as we will only temporarily active this
@@ -1412,7 +1412,7 @@ static void restoreMirrorPoseBones(TransDataContainer *tc)
   }
 }
 
-void recalcData_pose(TransInfo *t)
+static void recalcData_pose(TransInfo *t)
 {
   if (t->mode == TFM_BONESIZE) {
     /* Handle the exception where for TFM_BONESIZE in edit mode we pretend to be
@@ -1684,7 +1684,7 @@ static void pose_grab_with_ik_clear(Main *bmain, Object *ob)
   }
 }
 
-void special_aftertrans_update__pose(bContext *C, TransInfo *t)
+static void special_aftertrans_update__pose(bContext *C, TransInfo *t)
 {
   Object *ob;
 
@@ -1768,3 +1768,17 @@ void special_aftertrans_update__pose(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_EditArmature = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransArmatureVerts,
+    /* recalcData */ recalcData_edit_armature,
+    /* special_aftertrans_update */ NULL,
+};
+
+TransConvertTypeInfo TransConvertType_Pose = {
+    /* flags */ 0,
+    /* createTransData */ createTransPose,
+    /* recalcData */ recalcData_pose,
+    /* special_aftertrans_update */ special_aftertrans_update__pose,
+};
diff --git a/source/blender/editors/transform/transform_convert_cursor.c b/source/blender/editors/transform/transform_convert_cursor.c
index 5e6eee192f2..0bf6f06a9f2 100644
--- a/source/blender/editors/transform/transform_convert_cursor.c
+++ b/source/blender/editors/transform/transform_convert_cursor.c
@@ -82,13 +82,13 @@ static void recalcData_cursor_2D_impl(TransInfo *t)
 /** \name Image Cursor
  * \{ */
 
-void createTransCursor_image(TransInfo *t)
+static void createTransCursor_image(bContext *UNUSED(C), TransInfo *t)
 {
   SpaceImage *sima = t->area->spacedata.first;
   createTransCursor_2D_impl(t, sima->cursor);
 }
 
-void recalcData_cursor_image(TransInfo *t)
+static void recalcData_cursor_image(TransInfo *t)
 {
   recalcData_cursor_2D_impl(t);
 }
@@ -99,7 +99,7 @@ void recalcData_cursor_image(TransInfo *t)
 /** \name Sequencer Cursor
  * \{ */
 
-void createTransCursor_sequencer(TransInfo *t)
+static void createTransCursor_sequencer(bContext *UNUSED(C), TransInfo *t)
 {
   SpaceSeq *sseq = t->area->spacedata.first;
   if (sseq->mainb != SEQ_DRAW_IMG_IMBUF) {
@@ -108,7 +108,7 @@ void createTransCursor_sequencer(TransInfo *t)
   createTransCursor_2D_impl(t, sseq->cursor);
 }
 
-void recalcData_cursor_sequencer(TransInfo *t)
+static void recalcData_cursor_sequencer(TransInfo *t)
 {
   recalcData_cursor_2D_impl(t);
 }
@@ -119,7 +119,7 @@ void recalcData_cursor_sequencer(TransInfo *t)
 /** \name View 3D Cursor
  * \{ */
 
-void createTransCursor_view3d(TransInfo *t)
+static void createTransCursor_view3d(bContext *UNUSED(C), TransInfo *t)
 {
   TransData *td;
 
@@ -178,9 +178,30 @@ void createTransCursor_view3d(TransInfo *t)
   td->ext->rotOrder = cursor->rotation_mode;
 }
 
-void recalcData_cursor_view3d(TransInfo *t)
+static void recalcData_cursor_view3d(TransInfo *t)
 {
   DEG_id_tag_update(&t->scene->id, ID_RECALC_COPY_ON_WRITE);
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_CursorImage = {
+    /* flags */ T_2D_EDIT,
+    /* createTransData */ createTransCursor_image,
+    /* recalcData */ recalcData_cursor_image,
+    /* special_aftertrans_update */ NULL,
+};
+
+TransConvertTypeInfo TransConvertType_CursorSequencer = {
+    /* flags */ T_2D_EDIT,
+    /* createTransData */ createTransCursor_sequencer,
+    /* recalcData */ recalcData_cursor_sequencer,
+    /* special_aftertrans_update */ NULL,
+};
+
+TransConvertTypeInfo TransConvertType_Cursor3D = {
+    /* flags */ 0,
+    /* createTransData */ createTransCursor_view3d,
+    /* recalcData */ recalcData_cursor_view3d,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_curve.c b/source/blender/editors/transform/transform_convert_curve.c
index b9581aa1e31..404b1293208 100644
--- a/source/blender/editors/transform/transform_convert_curve.c
+++ b/source/blender/editors/transform/transform_convert_curve.c
@@ -62,7 +62,7 @@ static int bezt_select_to_transform_triple_flag(const BezTriple *bezt, const boo
   return flag;
 }
 
-void createTransCurveVerts(TransInfo *t)
+static void createTransCurveVerts(bContext *UNUSED(C), TransInfo *t)
 {
 
 #define SEL_F1 (1 << 0)
@@ -415,7 +415,7 @@ void createTransCurveVerts(TransInfo *t)
 #undef SEL_F3
 }
 
-void recalcData_curve(TransInfo *t)
+static void recalcData_curve(TransInfo *t)
 {
   if (t->state != TRANS_CANCEL) {
     applySnappingIndividual(t);
@@ -446,3 +446,10 @@ void recalcData_curve(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Curve = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransCurveVerts,
+    /* recalcData */ recalcData_curve,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_gpencil.c b/source/blender/editors/transform/transform_convert_gpencil.c
index 4bd02b0a45b..b3d58f25ad3 100644
--- a/source/blender/editors/transform/transform_convert_gpencil.c
+++ b/source/blender/editors/transform/transform_convert_gpencil.c
@@ -19,6 +19,7 @@
 #include "BKE_gpencil.h"
 #include "BKE_gpencil_curve.h"
 #include "BKE_gpencil_geom.h"
+#include "BKE_layer.h"
 
 #include "ED_gpencil.h"
 #include "ED_keyframing.h"
@@ -672,7 +673,7 @@ static void createTransGPencil_strokes(bContext *C,
   }
 }
 
-void createTransGPencil(bContext *C, TransInfo *t)
+static void createTransGPencil(bContext *C, TransInfo *t)
 {
   if (t->data_container_len == 0) {
     return;
@@ -681,7 +682,8 @@ void createTransGPencil(bContext *C, TransInfo *t)
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
   const Scene *scene = CTX_data_scene(C);
   ToolSettings *ts = scene->toolsettings;
-  Object *obact = OBACT(t->view_layer);
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Object *obact = BKE_view_layer_active_object_get(t->view_layer);
   bGPdata *gpd = obact->data;
   BLI_assert(gpd != NULL);
 
@@ -737,7 +739,7 @@ void createTransGPencil(bContext *C, TransInfo *t)
   }
 }
 
-void recalcData_gpencil_strokes(TransInfo *t)
+static void recalcData_gpencil_strokes(TransInfo *t)
 {
   TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_SINGLE(t);
   GHash *strokes = BLI_ghash_ptr_new(__func__);
@@ -762,3 +764,10 @@ void recalcData_gpencil_strokes(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_GPencil = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransGPencil,
+    /* recalcData */ recalcData_gpencil_strokes,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_graph.c b/source/blender/editors/transform/transform_convert_graph.c
index d93fff72de6..27e6c8a25e1 100644
--- a/source/blender/editors/transform/transform_convert_graph.c
+++ b/source/blender/editors/transform/transform_convert_graph.c
@@ -14,6 +14,7 @@
 
 #include "BKE_context.h"
 #include "BKE_fcurve.h"
+#include "BKE_layer.h"
 #include "BKE_nla.h"
 #include "BKE_report.h"
 
@@ -199,7 +200,16 @@ static void graph_key_shortest_dist(
   }
 }
 
-void createTransGraphEditData(bContext *C, TransInfo *t)
+/**
+ * It is important to note that this doesn't always act on the selection (like it's usually done),
+ * it acts on a subset of it. E.g. the selection code may leave a hint that we just dragged on a
+ * left or right handle (SIPO_RUNTIME_FLAG_TWEAK_HANDLES_LEFT/RIGHT) and then we only transform the
+ * selected left or right handles accordingly.
+ * The points to be transformed are tagged with BEZT_FLAG_TEMP_TAG; some lower level curve
+ * functions may need to be made aware of this. It's ugly that these act based on selection state
+ * anyway.
+ */
+static void createTransGraphEditData(bContext *C, TransInfo *t)
 {
   SpaceGraph *sipo = (SpaceGraph *)t->area->spacedata.first;
   Scene *scene = t->scene;
@@ -629,7 +639,7 @@ static bool fcu_test_selected(FCurve *fcu)
   return 0;
 }
 
-/* this function is called on recalcData to apply the transforms applied
+/* This function is called on recalcData to apply the transforms applied
  * to the transdata on to the actual keyframe data
  */
 static void flushTransGraphData(TransInfo *t)
@@ -886,7 +896,7 @@ static void remake_graph_transdata(TransInfo *t, ListBase *anim_data)
   }
 }
 
-void recalcData_graphedit(TransInfo *t)
+static void recalcData_graphedit(TransInfo *t)
 {
   SpaceGraph *sipo = (SpaceGraph *)t->area->spacedata.first;
   ViewLayer *view_layer = t->view_layer;
@@ -898,12 +908,14 @@ void recalcData_graphedit(TransInfo *t)
   bAnimListElem *ale;
   int dosort = 0;
 
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+
   /* initialize relevant anim-context 'context' data from TransInfo data */
   /* NOTE: sync this with the code in ANIM_animdata_get_context() */
   ac.bmain = CTX_data_main(t->context);
   ac.scene = t->scene;
   ac.view_layer = t->view_layer;
-  ac.obact = OBACT(view_layer);
+  ac.obact = BKE_view_layer_active_object_get(view_layer);
   ac.area = t->area;
   ac.region = t->region;
   ac.sl = (t->area) ? t->area->spacedata.first : NULL;
@@ -934,7 +946,7 @@ void recalcData_graphedit(TransInfo *t)
       dosort++;
     }
     else {
-      calchandles_fcurve_ex(fcu, BEZT_FLAG_TEMP_TAG);
+      BKE_fcurve_handles_recalc_ex(fcu, BEZT_FLAG_TEMP_TAG);
     }
 
     /* set refresh tags for objects using this animation,
@@ -960,7 +972,7 @@ void recalcData_graphedit(TransInfo *t)
 /** \name Special After Transform Graph
  * \{ */
 
-void special_aftertrans_update__graph(bContext *C, TransInfo *t)
+static void special_aftertrans_update__graph(bContext *C, TransInfo *t)
 {
   SpaceGraph *sipo = (SpaceGraph *)t->area->spacedata.first;
   bAnimContext ac;
@@ -1021,3 +1033,10 @@ void special_aftertrans_update__graph(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Graph = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransGraphEditData,
+    /* recalcData */ recalcData_graphedit,
+    /* special_aftertrans_update */ special_aftertrans_update__graph,
+};
diff --git a/source/blender/editors/transform/transform_convert_lattice.c b/source/blender/editors/transform/transform_convert_lattice.c
index d3c34697237..b77538dc249 100644
--- a/source/blender/editors/transform/transform_convert_lattice.c
+++ b/source/blender/editors/transform/transform_convert_lattice.c
@@ -25,7 +25,7 @@
 /** \name Curve/Surfaces Transform Creation
  * \{ */
 
-void createTransLatticeVerts(TransInfo *t)
+static void createTransLatticeVerts(bContext *UNUSED(C), TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 
@@ -98,7 +98,7 @@ void createTransLatticeVerts(TransInfo *t)
   }
 }
 
-void recalcData_lattice(TransInfo *t)
+static void recalcData_lattice(TransInfo *t)
 {
   if (t->state != TRANS_CANCEL) {
     applySnappingIndividual(t);
@@ -114,3 +114,10 @@ void recalcData_lattice(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Lattice = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransLatticeVerts,
+    /* recalcData */ recalcData_lattice,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_mask.c b/source/blender/editors/transform/transform_convert_mask.c
index f035cfc7aa9..2dca59a5da1 100644
--- a/source/blender/editors/transform/transform_convert_mask.c
+++ b/source/blender/editors/transform/transform_convert_mask.c
@@ -245,7 +245,7 @@ static void MaskPointToTransData(Scene *scene,
   }
 }
 
-void createTransMaskingData(bContext *C, TransInfo *t)
+static void createTransMaskingData(bContext *C, TransInfo *t)
 {
   Scene *scene = CTX_data_scene(C);
   Mask *mask = CTX_data_edit_mask(C);
@@ -416,7 +416,7 @@ static void flushTransMasking(TransInfo *t)
   }
 }
 
-void recalcData_mask_common(TransInfo *t)
+static void recalcData_mask_common(TransInfo *t)
 {
   Mask *mask = CTX_data_edit_mask(t->context);
 
@@ -431,7 +431,7 @@ void recalcData_mask_common(TransInfo *t)
 /** \name Special After Transform Mask
  * \{ */
 
-void special_aftertrans_update__mask(bContext *C, TransInfo *t)
+static void special_aftertrans_update__mask(bContext *C, TransInfo *t)
 {
   Mask *mask = NULL;
 
@@ -463,3 +463,10 @@ void special_aftertrans_update__mask(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Mask = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransMaskingData,
+    /* recalcData */ recalcData_mask_common,
+    /* special_aftertrans_update */ special_aftertrans_update__mask,
+};
diff --git a/source/blender/editors/transform/transform_convert_mball.c b/source/blender/editors/transform/transform_convert_mball.c
index 5b2a1f8336d..7ae93524d0b 100644
--- a/source/blender/editors/transform/transform_convert_mball.c
+++ b/source/blender/editors/transform/transform_convert_mball.c
@@ -22,7 +22,7 @@
 /** \name Meta Elements Transform Creation
  * \{ */
 
-void createTransMBallVerts(TransInfo *t)
+static void createTransMBallVerts(bContext *UNUSED(C), TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     MetaBall *mb = (MetaBall *)tc->obedit->data;
@@ -119,7 +119,7 @@ void createTransMBallVerts(TransInfo *t)
 /** \name Recalc Meta Ball
  * \{ */
 
-void recalcData_mball(TransInfo *t)
+static void recalcData_mball(TransInfo *t)
 {
   if (t->state != TRANS_CANCEL) {
     applySnappingIndividual(t);
@@ -132,3 +132,10 @@ void recalcData_mball(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_MBall = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransMBallVerts,
+    /* recalcData */ recalcData_mball,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_mesh.c b/source/blender/editors/transform/transform_convert_mesh.c
index c8d943df3fa..f67a44703e5 100644
--- a/source/blender/editors/transform/transform_convert_mesh.c
+++ b/source/blender/editors/transform/transform_convert_mesh.c
@@ -1314,7 +1314,8 @@ void transform_convert_mesh_crazyspace_detect(TransInfo *t,
      * correction with \a quats, relative to the coordinates after
      * the modifiers that support deform matrices \a defcos. */
 
-#if 0 /* TODO(campbell): fix crazy-space & extrude so it can be enabled for general use. */
+#if 0 /* TODO(@campbellbarton): fix crazy-space & extrude so it can be enabled for general use. \
+       */
       if ((totleft > 0) || (totleft == -1))
 #else
     if (totleft > 0)
@@ -1408,7 +1409,6 @@ static void VertsToTransData(TransInfo *t,
                              TransDataExtension *tx,
                              BMEditMesh *em,
                              BMVert *eve,
-                             float *bweight,
                              const struct TransIslandData *island_data,
                              const int island_index)
 {
@@ -1449,17 +1449,13 @@ static void VertsToTransData(TransInfo *t,
   td->ext = NULL;
   td->val = NULL;
   td->extra = eve;
-  if (ELEM(t->mode, TFM_BWEIGHT, TFM_VERT_CREASE)) {
-    td->val = bweight;
-    td->ival = *bweight;
-  }
-  else if (t->mode == TFM_SHRINKFATTEN) {
+  if (t->mode == TFM_SHRINKFATTEN) {
     td->ext = tx;
     tx->isize[0] = BM_vert_calc_shell_factor_ex(eve, no, BM_ELEM_SELECT);
   }
 }
 
-void createTransEditVerts(TransInfo *t)
+static void createTransEditVerts(bContext *UNUSED(C), TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     TransDataExtension *tx = NULL;
@@ -1589,17 +1585,6 @@ void createTransEditVerts(TransInfo *t)
                                       "TransObData ext");
     }
 
-    int cd_vert_bweight_offset = -1;
-    int cd_vert_crease_offset = -1;
-    if (t->mode == TFM_BWEIGHT) {
-      BM_mesh_cd_flag_ensure(bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_VERT_BWEIGHT);
-      cd_vert_bweight_offset = CustomData_get_offset(&bm->vdata, CD_BWEIGHT);
-    }
-    else if (t->mode == TFM_VERT_CREASE) {
-      BM_mesh_cd_flag_ensure(bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_VERT_CREASE);
-      cd_vert_crease_offset = CustomData_get_offset(&bm->vdata, CD_CREASE);
-    }
-
     TransData *tob = tc->data;
     TransDataMirror *td_mirror = tc->data_mirror;
     BM_ITER_MESH_INDEX (eve, &iter, bm, BM_VERTS_OF_MESH, a) {
@@ -1632,15 +1617,9 @@ void createTransEditVerts(TransInfo *t)
         td_mirror++;
       }
       else if (prop_mode || BM_elem_flag_test(eve, BM_ELEM_SELECT)) {
-        float *bweight = (cd_vert_bweight_offset != -1) ?
-                             BM_ELEM_CD_GET_VOID_P(eve, cd_vert_bweight_offset) :
-                         (cd_vert_crease_offset != -1) ?
-                             BM_ELEM_CD_GET_VOID_P(eve, cd_vert_crease_offset) :
-                             NULL;
-
         /* Do not use the island center in case we are using islands
          * only to get axis for snap/rotate to normal... */
-        VertsToTransData(t, tob, tx, em, eve, bweight, &island_data, island_index);
+        VertsToTransData(t, tob, tx, em, eve, &island_data, island_index);
         if (tx) {
           tx++;
         }
@@ -2051,7 +2030,7 @@ static void tc_mesh_transdata_mirror_apply(TransDataContainer *tc)
   }
 }
 
-void recalcData_mesh(TransInfo *t)
+static void recalcData_mesh(TransInfo *t)
 {
   bool is_canceling = t->state == TRANS_CANCEL;
   /* Apply corrections. */
@@ -2145,9 +2124,16 @@ void special_aftertrans_update__mesh(bContext *UNUSED(C), TransInfo *t)
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     /* table needs to be created for each edit command, since vertices can move etc */
     ED_mesh_mirror_spatial_table_end(tc->obedit);
-    /* TODO(campbell): xform: We need support for many mirror objects at once! */
+    /* TODO(@campbellbarton): xform: We need support for many mirror objects at once! */
     break;
   }
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Mesh = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransEditVerts,
+    /* recalcData */ recalcData_mesh,
+    /* special_aftertrans_update */ special_aftertrans_update__mesh,
+};
diff --git a/source/blender/editors/transform/transform_convert_mesh_edge.c b/source/blender/editors/transform/transform_convert_mesh_edge.c
index 2d6c6a933d6..b1627e62f8c 100644
--- a/source/blender/editors/transform/transform_convert_mesh_edge.c
+++ b/source/blender/editors/transform/transform_convert_mesh_edge.c
@@ -23,7 +23,7 @@
 /** \name Edge (for crease) Transform Creation
  * \{ */
 
-void createTransEdge(TransInfo *t)
+static void createTransEdge(bContext *UNUSED(C), TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 
@@ -67,7 +67,9 @@ void createTransEdge(TransInfo *t)
 
     /* create data we need */
     if (t->mode == TFM_BWEIGHT) {
-      BM_mesh_cd_flag_ensure(em->bm, BKE_mesh_from_object(tc->obedit), ME_CDFLAG_EDGE_BWEIGHT);
+      if (!CustomData_has_layer(&em->bm->edata, CD_BWEIGHT)) {
+        BM_data_layer_add(em->bm, &em->bm->edata, CD_BWEIGHT);
+      }
       cd_edge_float_offset = CustomData_get_offset(&em->bm->edata, CD_BWEIGHT);
     }
     else { /* if (t->mode == TFM_EDGE_CREASE) { */
@@ -99,8 +101,8 @@ void createTransEdge(TransInfo *t)
         td->ext = NULL;
 
         fl_ptr = BM_ELEM_CD_GET_VOID_P(eed, cd_edge_float_offset);
-        td->val = fl_ptr;
-        td->ival = *fl_ptr;
+        td->loc = fl_ptr;
+        td->iloc[0] = *fl_ptr;
 
         td++;
       }
@@ -108,7 +110,7 @@ void createTransEdge(TransInfo *t)
   }
 }
 
-void recalcData_mesh_edge(TransInfo *t)
+static void recalcData_mesh_edge(TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     DEG_id_tag_update(tc->obedit->data, ID_RECALC_GEOMETRY);
@@ -116,3 +118,10 @@ void recalcData_mesh_edge(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_MeshEdge = {
+    /* flags */ T_EDIT,
+    /* createTransData */ createTransEdge,
+    /* recalcData */ recalcData_mesh_edge,
+    /* special_aftertrans_update */ special_aftertrans_update__mesh,
+};
diff --git a/source/blender/editors/transform/transform_convert_mesh_skin.c b/source/blender/editors/transform/transform_convert_mesh_skin.c
index fdc2ba59035..376e559181e 100644
--- a/source/blender/editors/transform/transform_convert_mesh_skin.c
+++ b/source/blender/editors/transform/transform_convert_mesh_skin.c
@@ -66,7 +66,7 @@ static void tc_mesh_skin_transdata_create(TransDataBasic *td,
   td->extra = eve;
 }
 
-void createTransMeshSkin(TransInfo *t)
+static void createTransMeshSkin(bContext *UNUSED(C), TransInfo *t)
 {
   BLI_assert(t->mode == TFM_SKIN_RESIZE);
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
@@ -271,7 +271,7 @@ static void tc_mesh_skin_apply_to_mirror(TransInfo *t)
   }
 }
 
-void recalcData_mesh_skin(TransInfo *t)
+static void recalcData_mesh_skin(TransInfo *t)
 {
   bool is_canceling = t->state == TRANS_CANCEL;
   /* mirror modifier clipping? */
@@ -289,3 +289,10 @@ void recalcData_mesh_skin(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_MeshSkin = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransMeshSkin,
+    /* recalcData */ recalcData_mesh_skin,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_mesh_uv.c b/source/blender/editors/transform/transform_convert_mesh_uv.c
index 18868643b6d..4f15fc240d3 100644
--- a/source/blender/editors/transform/transform_convert_mesh_uv.c
+++ b/source/blender/editors/transform/transform_convert_mesh_uv.c
@@ -74,8 +74,12 @@ static void UVsToTransData(const float aspect[2],
 /**
  * \param dists: Store the closest connected distance to selected vertices.
  */
-static void uv_set_connectivity_distance(BMesh *bm, float *dists, const float aspect[2])
+static void uv_set_connectivity_distance(const ToolSettings *ts,
+                                         BMesh *bm,
+                                         float *dists,
+                                         const float aspect[2])
 {
+#define TMP_LOOP_SELECT_TAG BM_ELEM_TAG_ALT
   /* Mostly copied from #transform_convert_mesh_connectivity_distance. */
   BLI_LINKSTACK_DECLARE(queue, BMLoop *);
 
@@ -101,15 +105,15 @@ static void uv_set_connectivity_distance(BMesh *bm, float *dists, const float as
 
     BM_ITER_ELEM (l, &liter, f, BM_LOOPS_OF_FACE) {
       float dist;
-      MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-
-      bool uv_vert_sel = luv->flag & MLOOPUV_VERTSEL;
+      bool uv_vert_sel = uvedit_uv_select_test_ex(ts, l, cd_loop_uv_offset);
 
       if (uv_vert_sel) {
         BLI_LINKSTACK_PUSH(queue, l);
+        BM_elem_flag_enable(l, TMP_LOOP_SELECT_TAG);
         dist = 0.0f;
       }
       else {
+        BM_elem_flag_disable(l, TMP_LOOP_SELECT_TAG);
         dist = FLT_MAX;
       }
 
@@ -164,7 +168,7 @@ static void uv_set_connectivity_distance(BMesh *bm, float *dists, const float as
 
         bool other_vert_sel, connected_vert_sel;
 
-        other_vert_sel = luv_other->flag & MLOOPUV_VERTSEL;
+        other_vert_sel = BM_elem_flag_test_bool(l_other, TMP_LOOP_SELECT_TAG);
 
         BM_ITER_ELEM (l_connected, &l_connected_iter, l_other->v, BM_LOOPS_OF_VERT) {
           if (l_connected == l_other) {
@@ -176,7 +180,7 @@ static void uv_set_connectivity_distance(BMesh *bm, float *dists, const float as
           }
 
           MLoopUV *luv_connected = BM_ELEM_CD_GET_VOID_P(l_connected, cd_loop_uv_offset);
-          connected_vert_sel = luv_connected->flag & MLOOPUV_VERTSEL;
+          connected_vert_sel = BM_elem_flag_test_bool(l_connected, TMP_LOOP_SELECT_TAG);
 
           /* Check if this loop is connected in UV space.
            * If the uv loops share the same selection state (if not, they are not connected as
@@ -232,13 +236,13 @@ static void uv_set_connectivity_distance(BMesh *bm, float *dists, const float as
   BLI_LINKSTACK_FREE(queue_next);
 
   MEM_freeN(dists_prev);
+#undef TMP_LOOP_SELECT_TAG
 }
 
-void createTransUVs(bContext *C, TransInfo *t)
+static void createTransUVs(bContext *C, TransInfo *t)
 {
   SpaceImage *sima = CTX_wm_space_image(C);
   Scene *scene = t->scene;
-  ToolSettings *ts = CTX_data_tool_settings(C);
 
   const bool is_prop_edit = (t->flag & T_PROP_EDIT) != 0;
   const bool is_prop_connected = (t->flag & T_PROP_CONNECTED) != 0;
@@ -266,13 +270,12 @@ void createTransUVs(bContext *C, TransInfo *t)
     /* count */
     if (is_island_center) {
       /* create element map with island information */
-      const bool use_facesel = (ts->uv_flag & UV_SYNC_SELECTION) == 0;
-      elementmap = BM_uv_element_map_create(em->bm, scene, use_facesel, true, false, true);
+      elementmap = BM_uv_element_map_create(em->bm, scene, true, false, true, true);
       if (elementmap == NULL) {
         continue;
       }
 
-      island_center = MEM_callocN(sizeof(*island_center) * elementmap->totalIslands, __func__);
+      island_center = MEM_callocN(sizeof(*island_center) * elementmap->total_islands, __func__);
     }
 
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
@@ -317,9 +320,7 @@ void createTransUVs(bContext *C, TransInfo *t)
     }
 
     if (is_island_center) {
-      int i;
-
-      for (i = 0; i < elementmap->totalIslands; i++) {
+      for (int i = 0; i < elementmap->total_islands; i++) {
         mul_v2_fl(island_center[i].co, 1.0f / island_center[i].co_num);
         mul_v2_v2(island_center[i].co, t->aspect);
       }
@@ -341,7 +342,7 @@ void createTransUVs(bContext *C, TransInfo *t)
     if (is_prop_connected) {
       prop_dists = MEM_callocN(em->bm->totloop * sizeof(float), "TransObPropDists(UV Editing)");
 
-      uv_set_connectivity_distance(em->bm, prop_dists, t->aspect);
+      uv_set_connectivity_distance(t->settings, em->bm, prop_dists, t->aspect);
     }
 
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
@@ -403,8 +404,8 @@ void createTransUVs(bContext *C, TransInfo *t)
 static void flushTransUVs(TransInfo *t)
 {
   SpaceImage *sima = t->area->spacedata.first;
-  const bool use_pixel_snap = ((sima->pixel_snap_mode != SI_PIXEL_SNAP_DISABLED) &&
-                               (t->state != TRANS_CANCEL));
+  const bool use_pixel_round = ((sima->pixel_round_mode != SI_PIXEL_ROUND_DISABLED) &&
+                                (t->state != TRANS_CANCEL));
 
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     TransData2D *td;
@@ -414,7 +415,7 @@ static void flushTransUVs(TransInfo *t)
     aspect_inv[0] = 1.0f / t->aspect[0];
     aspect_inv[1] = 1.0f / t->aspect[1];
 
-    if (use_pixel_snap) {
+    if (use_pixel_round) {
       int size_i[2];
       ED_space_image_get_size(sima, &size_i[0], &size_i[1]);
       size[0] = size_i[0];
@@ -426,16 +427,16 @@ static void flushTransUVs(TransInfo *t)
       td->loc2d[0] = td->loc[0] * aspect_inv[0];
       td->loc2d[1] = td->loc[1] * aspect_inv[1];
 
-      if (use_pixel_snap) {
+      if (use_pixel_round) {
         td->loc2d[0] *= size[0];
         td->loc2d[1] *= size[1];
 
-        switch (sima->pixel_snap_mode) {
-          case SI_PIXEL_SNAP_CENTER:
+        switch (sima->pixel_round_mode) {
+          case SI_PIXEL_ROUND_CENTER:
             td->loc2d[0] = roundf(td->loc2d[0] - 0.5f) + 0.5f;
             td->loc2d[1] = roundf(td->loc2d[1] - 0.5f) + 0.5f;
             break;
-          case SI_PIXEL_SNAP_CORNER:
+          case SI_PIXEL_ROUND_CORNER:
             td->loc2d[0] = roundf(td->loc2d[0]);
             td->loc2d[1] = roundf(td->loc2d[1]);
             break;
@@ -448,7 +449,7 @@ static void flushTransUVs(TransInfo *t)
   }
 }
 
-void recalcData_uv(TransInfo *t)
+static void recalcData_uv(TransInfo *t)
 {
   SpaceImage *sima = t->area->spacedata.first;
 
@@ -465,3 +466,10 @@ void recalcData_uv(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_MeshUV = {
+    /* flags */ (T_EDIT | T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransUVs,
+    /* recalcData */ recalcData_uv,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_mesh_vert_cdata.c b/source/blender/editors/transform/transform_convert_mesh_vert_cdata.c
new file mode 100644
index 00000000000..39705f87a0d
--- /dev/null
+++ b/source/blender/editors/transform/transform_convert_mesh_vert_cdata.c
@@ -0,0 +1,298 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2001-2002 NaN Holding BV. All rights reserved. */
+
+/** \file
+ * \ingroup edtransform
+ */
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_math.h"
+
+#include "BKE_context.h"
+#include "BKE_crazyspace.h"
+#include "BKE_editmesh.h"
+#include "BKE_modifier.h"
+#include "BKE_scene.h"
+
+#include "ED_mesh.h"
+
+#include "DEG_depsgraph_query.h"
+
+#include "transform.h"
+#include "transform_orientations.h"
+
+#include "transform_convert.h"
+
+/* -------------------------------------------------------------------- */
+/** \name Edit Mesh #CD_BWEIGHT and #CD_CREASE Transform Creation
+ * \{ */
+
+static float *tc_mesh_cdata_transdata_center(const struct TransIslandData *island_data,
+                                             const int island_index,
+                                             BMVert *eve)
+{
+  if (island_data->center && island_index != -1) {
+    return island_data->center[island_index];
+  }
+  return eve->co;
+}
+
+static void tc_mesh_cdata_transdata_create(TransDataBasic *td,
+                                           BMVert *eve,
+                                           float *weight,
+                                           const struct TransIslandData *island_data,
+                                           const int island_index)
+{
+  BLI_assert(BM_elem_flag_test(eve, BM_ELEM_HIDDEN) == 0);
+
+  td->loc = weight;
+  td->iloc[0] = *weight;
+
+  if (BM_elem_flag_test(eve, BM_ELEM_SELECT)) {
+    td->flag |= TD_SELECTED;
+  }
+
+  copy_v3_v3(td->center, tc_mesh_cdata_transdata_center(island_data, island_index, eve));
+  td->extra = eve;
+}
+
+static void createTransMeshVertCData(bContext *UNUSED(C), TransInfo *t)
+{
+  BLI_assert(ELEM(t->mode, TFM_BWEIGHT, TFM_VERT_CREASE));
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
+    Mesh *me = tc->obedit->data;
+    BMesh *bm = em->bm;
+    BMVert *eve;
+    BMIter iter;
+    float mtx[3][3], smtx[3][3];
+    int a;
+    const int prop_mode = (t->flag & T_PROP_EDIT) ? (t->flag & T_PROP_EDIT_ALL) : 0;
+
+    struct TransIslandData island_data = {NULL};
+    struct TransMirrorData mirror_data = {NULL};
+    struct TransMeshDataCrazySpace crazyspace_data = {NULL};
+
+    /* Support other objects using PET to adjust these, unless connected is enabled. */
+    if ((!prop_mode || (prop_mode & T_PROP_CONNECTED)) && (bm->totvertsel == 0)) {
+      continue;
+    }
+
+    int cd_offset = -1;
+    if (t->mode == TFM_BWEIGHT) {
+      if (!CustomData_has_layer(&bm->vdata, CD_BWEIGHT)) {
+        BM_data_layer_add(bm, &bm->vdata, CD_BWEIGHT);
+      }
+      cd_offset = CustomData_get_offset(&bm->vdata, CD_BWEIGHT);
+    }
+    else {
+      BM_mesh_cd_flag_ensure(bm, me, ME_CDFLAG_VERT_CREASE);
+      cd_offset = CustomData_get_offset(&bm->vdata, CD_CREASE);
+    }
+
+    if (cd_offset == -1) {
+      continue;
+    }
+
+    int data_len = 0;
+    if (prop_mode) {
+      BM_ITER_MESH (eve, &iter, bm, BM_VERTS_OF_MESH) {
+        if (!BM_elem_flag_test(eve, BM_ELEM_HIDDEN)) {
+          data_len++;
+        }
+      }
+    }
+    else {
+      data_len = bm->totvertsel;
+    }
+
+    if (data_len == 0) {
+      continue;
+    }
+
+    const bool is_island_center = (t->around == V3D_AROUND_LOCAL_ORIGINS);
+    if (is_island_center) {
+      /* In this specific case, near-by vertices will need to know
+       * the island of the nearest connected vertex. */
+      const bool calc_single_islands = ((prop_mode & T_PROP_CONNECTED) &&
+                                        (t->around == V3D_AROUND_LOCAL_ORIGINS) &&
+                                        (em->selectmode & SCE_SELECT_VERTEX));
+
+      const bool calc_island_center = false;
+      const bool calc_island_axismtx = false;
+
+      transform_convert_mesh_islands_calc(
+          em, calc_single_islands, calc_island_center, calc_island_axismtx, &island_data);
+    }
+
+    copy_m3_m4(mtx, tc->obedit->obmat);
+    /* we use a pseudo-inverse so that when one of the axes is scaled to 0,
+     * matrix inversion still works and we can still moving along the other */
+    pseudoinverse_m3_m3(smtx, mtx, PSEUDOINVERSE_EPSILON);
+
+    /* Original index of our connected vertex when connected distances are calculated.
+     * Optional, allocate if needed. */
+    int *dists_index = NULL;
+    float *dists = NULL;
+    if (prop_mode & T_PROP_CONNECTED) {
+      dists = MEM_mallocN(bm->totvert * sizeof(float), __func__);
+      if (is_island_center) {
+        dists_index = MEM_mallocN(bm->totvert * sizeof(int), __func__);
+      }
+      transform_convert_mesh_connectivity_distance(em->bm, mtx, dists, dists_index);
+    }
+
+    /* Create TransDataMirror. */
+    if (tc->use_mirror_axis_any) {
+      bool use_topology = (me->editflag & ME_EDIT_MIRROR_TOPO) != 0;
+      bool use_select = (t->flag & T_PROP_EDIT) == 0;
+      const bool mirror_axis[3] = {
+          tc->use_mirror_axis_x, tc->use_mirror_axis_y, tc->use_mirror_axis_z};
+      transform_convert_mesh_mirrordata_calc(
+          em, use_select, use_topology, mirror_axis, &mirror_data);
+
+      if (mirror_data.vert_map) {
+        tc->data_mirror_len = mirror_data.mirror_elem_len;
+        tc->data_mirror = MEM_mallocN(mirror_data.mirror_elem_len * sizeof(*tc->data_mirror),
+                                      __func__);
+
+        BM_ITER_MESH_INDEX (eve, &iter, bm, BM_VERTS_OF_MESH, a) {
+          if (prop_mode || BM_elem_flag_test(eve, BM_ELEM_SELECT)) {
+            if (mirror_data.vert_map[a].index != -1) {
+              data_len--;
+            }
+          }
+        }
+      }
+    }
+
+    /* Detect CrazySpace [tm]. */
+    transform_convert_mesh_crazyspace_detect(t, tc, em, &crazyspace_data);
+
+    /* Create TransData. */
+    BLI_assert(data_len >= 1);
+    tc->data_len = data_len;
+    tc->data = MEM_callocN(data_len * sizeof(TransData), "TransObData(Mesh EditMode)");
+
+    TransData *td = tc->data;
+    TransDataMirror *td_mirror = tc->data_mirror;
+    BM_ITER_MESH_INDEX (eve, &iter, bm, BM_VERTS_OF_MESH, a) {
+      if (BM_elem_flag_test(eve, BM_ELEM_HIDDEN)) {
+        continue;
+      }
+
+      int island_index = -1;
+      if (island_data.island_vert_map) {
+        const int connected_index = (dists_index && dists_index[a] != -1) ? dists_index[a] : a;
+        island_index = island_data.island_vert_map[connected_index];
+      }
+
+      float *weight = BM_ELEM_CD_GET_VOID_P(eve, cd_offset);
+      if (mirror_data.vert_map && mirror_data.vert_map[a].index != -1) {
+        tc_mesh_cdata_transdata_create(
+            (TransDataBasic *)td_mirror, eve, weight, &island_data, island_index);
+
+        int elem_index = mirror_data.vert_map[a].index;
+        BMVert *v_src = BM_vert_at_index(bm, elem_index);
+
+        td_mirror->flag |= mirror_data.vert_map[a].flag;
+        td_mirror->loc_src = BM_ELEM_CD_GET_VOID_P(v_src, cd_offset);
+        td_mirror++;
+      }
+      else if (prop_mode || BM_elem_flag_test(eve, BM_ELEM_SELECT)) {
+        tc_mesh_cdata_transdata_create(
+            (TransDataBasic *)td, eve, weight, &island_data, island_index);
+
+        if (t->around == V3D_AROUND_LOCAL_ORIGINS) {
+          createSpaceNormal(td->axismtx, eve->no);
+        }
+        else {
+          /* Setting normals */
+          copy_v3_v3(td->axismtx[2], eve->no);
+          td->axismtx[0][0] = td->axismtx[0][1] = td->axismtx[0][2] = td->axismtx[1][0] =
+              td->axismtx[1][1] = td->axismtx[1][2] = 0.0f;
+        }
+
+        if (prop_mode) {
+          if (prop_mode & T_PROP_CONNECTED) {
+            td->dist = dists[a];
+          }
+          else {
+            td->flag |= TD_NOTCONNECTED;
+            td->dist = FLT_MAX;
+          }
+        }
+
+        /* CrazySpace */
+        transform_convert_mesh_crazyspace_transdata_set(
+            mtx,
+            smtx,
+            crazyspace_data.defmats ? crazyspace_data.defmats[a] : NULL,
+            crazyspace_data.quats && BM_elem_flag_test(eve, BM_ELEM_TAG) ?
+                crazyspace_data.quats[a] :
+                NULL,
+            td);
+
+        td++;
+      }
+    }
+
+    transform_convert_mesh_islanddata_free(&island_data);
+    transform_convert_mesh_mirrordata_free(&mirror_data);
+    transform_convert_mesh_crazyspace_free(&crazyspace_data);
+    if (dists) {
+      MEM_freeN(dists);
+    }
+    if (dists_index) {
+      MEM_freeN(dists_index);
+    }
+  }
+}
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Recalc Mesh Data
+ * \{ */
+
+static void tc_mesh_cdata_apply_to_mirror(TransInfo *t)
+{
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    if (tc->use_mirror_axis_any) {
+      TransDataMirror *td_mirror = tc->data_mirror;
+      for (int i = 0; i < tc->data_mirror_len; i++, td_mirror++) {
+        td_mirror->loc[0] = td_mirror->loc_src[0];
+      }
+    }
+  }
+}
+
+static void recalcData_mesh_cdata(TransInfo *t)
+{
+  bool is_canceling = t->state == TRANS_CANCEL;
+  /* mirror modifier clipping? */
+  if (!is_canceling) {
+    if (!(t->flag & T_NO_MIRROR)) {
+      tc_mesh_cdata_apply_to_mirror(t);
+    }
+  }
+
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    DEG_id_tag_update(tc->obedit->data, ID_RECALC_GEOMETRY);
+    BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
+    BKE_editmesh_looptri_and_normals_calc(em);
+  }
+}
+
+/** \} */
+
+TransConvertTypeInfo TransConvertType_MeshVertCData = {
+    /* flags */ (T_EDIT | T_POINTS),
+    /* createTransData */ createTransMeshVertCData,
+    /* recalcData */ recalcData_mesh_cdata,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_nla.c b/source/blender/editors/transform/transform_convert_nla.c
index 32f70fc010b..cfa933d1600 100644
--- a/source/blender/editors/transform/transform_convert_nla.c
+++ b/source/blender/editors/transform/transform_convert_nla.c
@@ -59,7 +59,7 @@ typedef struct TransDataNla {
 /** \name NLA Transform Creation
  * \{ */
 
-void createTransNlaData(bContext *C, TransInfo *t)
+static void createTransNlaData(bContext *C, TransInfo *t)
 {
   Scene *scene = t->scene;
   SpaceNla *snla = NULL;
@@ -249,7 +249,7 @@ void createTransNlaData(bContext *C, TransInfo *t)
   ANIM_animdata_freelist(&anim_data);
 }
 
-void recalcData_nla(TransInfo *t)
+static void recalcData_nla(TransInfo *t)
 {
   SpaceNla *snla = (SpaceNla *)t->area->spacedata.first;
 
@@ -464,7 +464,7 @@ void recalcData_nla(TransInfo *t)
 /** \name Special After Transform NLA
  * \{ */
 
-void special_aftertrans_update__nla(bContext *C, TransInfo *UNUSED(t))
+static void special_aftertrans_update__nla(bContext *C, TransInfo *UNUSED(t))
 {
   bAnimContext ac;
 
@@ -506,3 +506,10 @@ void special_aftertrans_update__nla(bContext *C, TransInfo *UNUSED(t))
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_NLA = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransNlaData,
+    /* recalcData */ recalcData_nla,
+    /* special_aftertrans_update */ special_aftertrans_update__nla,
+};
diff --git a/source/blender/editors/transform/transform_convert_node.c b/source/blender/editors/transform/transform_convert_node.c
index 8281052c314..ed19789fdd8 100644
--- a/source/blender/editors/transform/transform_convert_node.c
+++ b/source/blender/editors/transform/transform_convert_node.c
@@ -27,6 +27,13 @@
 #include "transform_convert.h"
 #include "transform_snap.h"
 
+struct TransCustomDataNode {
+  View2DEdgePanData edgepan_data;
+
+  /* Compare if the view has changed so we can update with `transformViewUpdate`. */
+  rctf viewrect_prev;
+};
+
 /* -------------------------------------------------------------------- */
 /** \name Node Transform Creation
  * \{ */
@@ -89,21 +96,23 @@ static bool is_node_parent_select(bNode *node)
   return false;
 }
 
-void createTransNodeData(TransInfo *t)
+static void createTransNodeData(bContext *UNUSED(C), TransInfo *t)
 {
   const float dpi_fac = UI_DPI_FAC;
   SpaceNode *snode = t->area->spacedata.first;
 
   /* Custom data to enable edge panning during the node transform */
-  View2DEdgePanData *customdata = MEM_callocN(sizeof(*customdata), __func__);
+  struct TransCustomDataNode *customdata = MEM_callocN(sizeof(*customdata), __func__);
   UI_view2d_edge_pan_init(t->context,
-                          customdata,
+                          &customdata->edgepan_data,
                           NODE_EDGE_PAN_INSIDE_PAD,
                           NODE_EDGE_PAN_OUTSIDE_PAD,
                           NODE_EDGE_PAN_SPEED_RAMP,
                           NODE_EDGE_PAN_MAX_SPEED,
                           NODE_EDGE_PAN_DELAY,
                           NODE_EDGE_PAN_ZOOM_INFLUENCE);
+  customdata->viewrect_prev = customdata->edgepan_data.initial_rect;
+
   t->custom.type.data = customdata;
   t->custom.type.use_free = true;
 
@@ -150,15 +159,15 @@ void createTransNodeData(TransInfo *t)
 /** \name Node Transform Creation
  * \{ */
 
-void flushTransNodes(TransInfo *t)
+static void flushTransNodes(TransInfo *t)
 {
   const float dpi_fac = UI_DPI_FAC;
 
-  View2DEdgePanData *customdata = (View2DEdgePanData *)t->custom.type.data;
+  struct TransCustomDataNode *customdata = (struct TransCustomDataNode *)t->custom.type.data;
 
   if (t->options & CTX_VIEW2D_EDGE_PAN) {
     if (t->state == TRANS_CANCEL) {
-      UI_view2d_edge_pan_cancel(t->context, customdata);
+      UI_view2d_edge_pan_cancel(t->context, &customdata->edgepan_data);
     }
     else {
       /* Edge panning functions expect window coordinates, mval is relative to region */
@@ -166,13 +175,19 @@ void flushTransNodes(TransInfo *t)
           t->region->winrct.xmin + t->mval[0],
           t->region->winrct.ymin + t->mval[1],
       };
-      UI_view2d_edge_pan_apply(t->context, customdata, xy);
+      UI_view2d_edge_pan_apply(t->context, &customdata->edgepan_data, xy);
     }
   }
 
-  /* Initial and current view2D rects for additional transform due to view panning and zooming */
-  const rctf *rect_src = &customdata->initial_rect;
-  const rctf *rect_dst = &t->region->v2d.cur;
+  float offset[2] = {0.0f, 0.0f};
+  if (t->state != TRANS_CANCEL) {
+    if (!BLI_rctf_compare(&customdata->viewrect_prev, &t->region->v2d.cur, FLT_EPSILON)) {
+      /* Additional offset due to change in view2D rect. */
+      BLI_rctf_transform_pt_v(&t->region->v2d.cur, &customdata->viewrect_prev, offset, offset);
+      tranformViewUpdate(t);
+      customdata->viewrect_prev = t->region->v2d.cur;
+    }
+  }
 
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     applyGridAbsolute(t);
@@ -184,10 +199,7 @@ void flushTransNodes(TransInfo *t)
       bNode *node = td->extra;
 
       float loc[2];
-      copy_v2_v2(loc, td2d->loc);
-
-      /* additional offset due to change in view2D rect */
-      BLI_rctf_transform_pt_v(rect_dst, rect_src, loc, loc);
+      add_v2_v2v2(loc, td2d->loc, offset);
 
 #ifdef USE_NODE_CENTER
       loc[0] -= 0.5f * BLI_rctf_size_x(&node->totr);
@@ -220,7 +232,7 @@ void flushTransNodes(TransInfo *t)
 /** \name Special After Transform Node
  * \{ */
 
-void special_aftertrans_update__node(bContext *C, TransInfo *t)
+static void special_aftertrans_update__node(bContext *C, TransInfo *t)
 {
   struct Main *bmain = CTX_data_main(C);
   const bool canceled = (t->state == TRANS_CANCEL);
@@ -249,3 +261,10 @@ void special_aftertrans_update__node(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Node = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransNodeData,
+    /* recalcData */ flushTransNodes,
+    /* special_aftertrans_update */ special_aftertrans_update__node,
+};
diff --git a/source/blender/editors/transform/transform_convert_object.c b/source/blender/editors/transform/transform_convert_object.c
index 26d57ae1e58..caa11fa5db4 100644
--- a/source/blender/editors/transform/transform_convert_object.c
+++ b/source/blender/editors/transform/transform_convert_object.c
@@ -291,9 +291,10 @@ static void ObjectToTransData(TransInfo *t, TransData *td, Object *ob)
   }
 }
 
-static void trans_object_base_deps_flag_prepare(ViewLayer *view_layer)
+static void trans_object_base_deps_flag_prepare(const Scene *scene, ViewLayer *view_layer)
 {
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     base->object->id.tag &= ~LIB_TAG_DOIT;
   }
 }
@@ -323,11 +324,14 @@ static void flush_trans_object_base_deps_flag(Depsgraph *depsgraph, Object *obje
                                      NULL);
 }
 
-static void trans_object_base_deps_flag_finish(const TransInfo *t, ViewLayer *view_layer)
+static void trans_object_base_deps_flag_finish(const TransInfo *t,
+                                               const Scene *scene,
+                                               ViewLayer *view_layer)
 {
 
   if ((t->options & CTX_OBMODE_XFORM_OBDATA) == 0) {
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       if (base->object->id.tag & LIB_TAG_DOIT) {
         base->flag_legacy |= BA_SNAP_FIX_DEPS_FIASCO;
       }
@@ -352,13 +356,14 @@ static void set_trans_object_base_flags(TransInfo *t)
     return;
   }
   /* Makes sure base flags and object flags are identical. */
-  BKE_scene_base_flag_to_objects(t->view_layer);
+  BKE_scene_base_flag_to_objects(t->scene, t->view_layer);
   /* Make sure depsgraph is here. */
   DEG_graph_relations_update(depsgraph);
   /* Clear all flags we need. It will be used to detect dependencies. */
-  trans_object_base_deps_flag_prepare(view_layer);
+  trans_object_base_deps_flag_prepare(scene, view_layer);
   /* Traverse all bases and set all possible flags. */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     base->flag_legacy &= ~(BA_WAS_SEL | BA_TRANSFORM_LOCKED_IN_PLACE);
     if (BASE_SELECTED_EDITABLE(v3d, base)) {
       Object *ob = base->object;
@@ -392,7 +397,7 @@ static void set_trans_object_base_flags(TransInfo *t)
   /* Store temporary bits in base indicating that base is being modified
    * (directly or indirectly) by transforming objects.
    */
-  trans_object_base_deps_flag_finish(t, view_layer);
+  trans_object_base_deps_flag_finish(t, scene, view_layer);
 }
 
 static bool mark_children(Object *ob)
@@ -420,11 +425,11 @@ static int count_proportional_objects(TransInfo *t)
   Scene *scene = t->scene;
   Depsgraph *depsgraph = BKE_scene_ensure_depsgraph(bmain, scene, view_layer);
   /* Clear all flags we need. It will be used to detect dependencies. */
-  trans_object_base_deps_flag_prepare(view_layer);
+  trans_object_base_deps_flag_prepare(scene, view_layer);
   /* Rotations around local centers are allowed to propagate, so we take all objects. */
   if (!((t->around == V3D_AROUND_LOCAL_ORIGINS) && (ELEM(t->mode, TFM_ROTATION, TFM_TRACKBALL)))) {
     /* Mark all parents. */
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       if (BASE_SELECTED_EDITABLE(v3d, base) && BASE_SELECTABLE(v3d, base)) {
         Object *parent = base->object->parent;
         /* flag all parents */
@@ -435,7 +440,7 @@ static int count_proportional_objects(TransInfo *t)
       }
     }
     /* Mark all children. */
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       /* all base not already selected or marked that is editable */
       if ((base->object->flag & (BA_TRANSFORM_CHILD | BA_TRANSFORM_PARENT)) == 0 &&
           (base->flag & BASE_SELECTED) == 0 &&
@@ -445,7 +450,7 @@ static int count_proportional_objects(TransInfo *t)
     }
   }
   /* Flush changed flags to all dependencies. */
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     Object *ob = base->object;
     /* If base is not selected, not a parent of selection or not a child of
      * selection and it is editable and selectable.
@@ -460,16 +465,17 @@ static int count_proportional_objects(TransInfo *t)
   /* Store temporary bits in base indicating that base is being modified
    * (directly or indirectly) by transforming objects.
    */
-  trans_object_base_deps_flag_finish(t, view_layer);
+  trans_object_base_deps_flag_finish(t, scene, view_layer);
   return total;
 }
 
 static void clear_trans_object_base_flags(TransInfo *t)
 {
+  Scene *scene = t->scene;
   ViewLayer *view_layer = t->view_layer;
-  Base *base;
 
-  for (base = view_layer->object_bases.first; base; base = base->next) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (base->flag_legacy & BA_WAS_SEL) {
       ED_object_base_select(base, BA_SELECT);
     }
@@ -480,7 +486,7 @@ static void clear_trans_object_base_flags(TransInfo *t)
   }
 }
 
-void createTransObject(bContext *C, TransInfo *t)
+static void createTransObject(bContext *C, TransInfo *t)
 {
   Main *bmain = CTX_data_main(C);
   TransData *td = NULL;
@@ -559,11 +565,12 @@ void createTransObject(bContext *C, TransInfo *t)
   CTX_DATA_END;
 
   if (is_prop_edit) {
+    Scene *scene = t->scene;
     ViewLayer *view_layer = t->view_layer;
     View3D *v3d = t->view;
-    Base *base;
 
-    for (base = view_layer->object_bases.first; base; base = base->next) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       Object *ob = base->object;
 
       /* if base is not selected, not a parent of selection
@@ -592,10 +599,12 @@ void createTransObject(bContext *C, TransInfo *t)
       }
     }
 
+    Scene *scene = t->scene;
     ViewLayer *view_layer = t->view_layer;
     View3D *v3d = t->view;
 
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       Object *ob = base->object;
 
       /* if base is not selected, not a parent of selection
@@ -640,9 +649,11 @@ void createTransObject(bContext *C, TransInfo *t)
       }
     }
 
+    Scene *scene = t->scene;
     ViewLayer *view_layer = t->view_layer;
 
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       Object *ob = base->object;
       if (ob->parent != NULL) {
         if (ob->parent && !BLI_gset_haskey(objects_in_transdata, ob->parent) &&
@@ -672,7 +683,7 @@ void createTransObject(bContext *C, TransInfo *t)
       }
     }
 
-    LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+    LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
       Object *ob = base->object;
 
       if (BASE_XFORM_INDIRECT(base) || BLI_gset_haskey(objects_in_transdata, ob)) {
@@ -782,7 +793,8 @@ static void autokeyframe_object(
       }
       else if (ELEM(tmode, TFM_ROTATION, TFM_TRACKBALL)) {
         if (scene->toolsettings->transform_pivot_point == V3D_AROUND_ACTIVE) {
-          if (ob != OBACT(view_layer)) {
+          BKE_view_layer_synced_ensure(scene, view_layer);
+          if (ob != BKE_view_layer_active_object_get(view_layer)) {
             do_loc = true;
           }
         }
@@ -796,7 +808,8 @@ static void autokeyframe_object(
       }
       else if (tmode == TFM_RESIZE) {
         if (scene->toolsettings->transform_pivot_point == V3D_AROUND_ACTIVE) {
-          if (ob != OBACT(view_layer)) {
+          BKE_view_layer_synced_ensure(scene, view_layer);
+          if (ob != BKE_view_layer_active_object_get(view_layer)) {
             do_loc = true;
           }
         }
@@ -860,7 +873,7 @@ static bool motionpath_need_update_object(Scene *scene, Object *ob)
 /** \name Recalc Data object
  * \{ */
 
-void recalcData_objects(TransInfo *t)
+static void recalcData_objects(TransInfo *t)
 {
   bool motionpath_update = false;
 
@@ -918,7 +931,7 @@ void recalcData_objects(TransInfo *t)
 /** \name Special After Transform Object
  * \{ */
 
-void special_aftertrans_update__object(bContext *C, TransInfo *t)
+static void special_aftertrans_update__object(bContext *C, TransInfo *t)
 {
   BLI_assert(t->options & CTX_OBJECT);
 
@@ -991,3 +1004,10 @@ void special_aftertrans_update__object(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Object = {
+    /* flags */ 0,
+    /* createTransData */ createTransObject,
+    /* recalcData */ recalcData_objects,
+    /* special_aftertrans_update */ special_aftertrans_update__object,
+};
diff --git a/source/blender/editors/transform/transform_convert_object_texspace.c b/source/blender/editors/transform/transform_convert_object_texspace.c
index e5a66f8a1d2..839bf6b77b3 100644
--- a/source/blender/editors/transform/transform_convert_object_texspace.c
+++ b/source/blender/editors/transform/transform_convert_object_texspace.c
@@ -11,6 +11,7 @@
 
 #include "BKE_animsys.h"
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_object.h"
 #include "BKE_report.h"
 
@@ -29,7 +30,7 @@
  *
  * \{ */
 
-void createTransTexspace(TransInfo *t)
+static void createTransTexspace(bContext *UNUSED(C), TransInfo *t)
 {
   ViewLayer *view_layer = t->view_layer;
   TransData *td;
@@ -37,7 +38,8 @@ void createTransTexspace(TransInfo *t)
   ID *id;
   char *texflag;
 
-  ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  ob = BKE_view_layer_active_object_get(view_layer);
 
   if (ob == NULL) { /* Shouldn't logically happen, but still. */
     return;
@@ -86,7 +88,7 @@ void createTransTexspace(TransInfo *t)
 /** \name Recalc Data object
  * \{ */
 
-void recalcData_texspace(TransInfo *t)
+static void recalcData_texspace(TransInfo *t)
 {
 
   if (t->state != TRANS_CANCEL) {
@@ -106,3 +108,10 @@ void recalcData_texspace(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_ObjectTexSpace = {
+    /* flags */ 0,
+    /* createTransData */ createTransTexspace,
+    /* recalcData */ recalcData_texspace,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_paintcurve.c b/source/blender/editors/transform/transform_convert_paintcurve.c
index b2566016496..61b1cb9493b 100644
--- a/source/blender/editors/transform/transform_convert_paintcurve.c
+++ b/source/blender/editors/transform/transform_convert_paintcurve.c
@@ -108,7 +108,7 @@ static void PaintCurvePointToTransData(PaintCurvePoint *pcp,
   }
 }
 
-void createTransPaintCurveVerts(bContext *C, TransInfo *t)
+static void createTransPaintCurveVerts(bContext *C, TransInfo *t)
 {
   Paint *paint = BKE_paint_get_active_from_context(C);
   PaintCurve *pc;
@@ -188,7 +188,7 @@ void createTransPaintCurveVerts(bContext *C, TransInfo *t)
 /** \name Paint Curve Transform Flush
  * \{ */
 
-void flushTransPaintCurve(TransInfo *t)
+static void flushTransPaintCurve(TransInfo *t)
 {
   int i;
 
@@ -204,3 +204,10 @@ void flushTransPaintCurve(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_PaintCurve = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransPaintCurveVerts,
+    /* recalcData */ flushTransPaintCurve,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_particle.c b/source/blender/editors/transform/transform_convert_particle.c
index 31e73288ad0..3e056b6a048 100644
--- a/source/blender/editors/transform/transform_convert_particle.c
+++ b/source/blender/editors/transform/transform_convert_particle.c
@@ -13,6 +13,7 @@
 #include "BLI_math.h"
 
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_particle.h"
 #include "BKE_pointcache.h"
 
@@ -28,13 +29,14 @@
 /** \name Particle Edit Transform Creation
  * \{ */
 
-void createTransParticleVerts(TransInfo *t)
+static void createTransParticleVerts(bContext *UNUSED(C), TransInfo *t)
 {
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 
     TransData *td = NULL;
     TransDataExtension *tx;
-    Object *ob = OBACT(t->view_layer);
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    Object *ob = BKE_view_layer_active_object_get(t->view_layer);
     ParticleEditSettings *pset = PE_settings(t->scene);
     PTCacheEdit *edit = PE_get_current(t->depsgraph, t->scene, ob);
     ParticleSystem *psys = NULL;
@@ -183,7 +185,8 @@ static void flushTransParticles(TransInfo *t)
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
     Scene *scene = t->scene;
     ViewLayer *view_layer = t->view_layer;
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
     PTCacheEdit *edit = PE_get_current(t->depsgraph, scene, ob);
     ParticleSystem *psys = edit->psys;
     PTCacheEditPoint *point;
@@ -223,7 +226,7 @@ static void flushTransParticles(TransInfo *t)
       }
     }
 
-    PE_update_object(t->depsgraph, scene, OBACT(view_layer), 1);
+    PE_update_object(t->depsgraph, scene, ob, 1);
     BKE_particle_batch_cache_dirty_tag(psys, BKE_PARTICLE_BATCH_DIRTY_ALL);
     DEG_id_tag_update(&ob->id, ID_RECALC_PSYS_REDO);
   }
@@ -235,7 +238,7 @@ static void flushTransParticles(TransInfo *t)
 /** \name Recalc Transform Particles Data
  * \{ */
 
-void recalcData_particles(TransInfo *t)
+static void recalcData_particles(TransInfo *t)
 {
   if (t->state != TRANS_CANCEL) {
     applySnappingIndividual(t);
@@ -244,3 +247,10 @@ void recalcData_particles(TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Particle = {
+    /* flags */ T_POINTS,
+    /* createTransData */ createTransParticleVerts,
+    /* recalcData */ recalcData_particles,
+    /* special_aftertrans_update */ NULL,
+};
diff --git a/source/blender/editors/transform/transform_convert_sculpt.c b/source/blender/editors/transform/transform_convert_sculpt.c
index 5bf6bfa8644..3792cfefe06 100644
--- a/source/blender/editors/transform/transform_convert_sculpt.c
+++ b/source/blender/editors/transform/transform_convert_sculpt.c
@@ -10,6 +10,7 @@
 #include "BLI_math.h"
 
 #include "BKE_context.h"
+#include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_paint.h"
 #include "BKE_report.h"
@@ -23,7 +24,7 @@
 /** \name Sculpt Transform Creation
  * \{ */
 
-void createTransSculpt(bContext *C, TransInfo *t)
+static void createTransSculpt(bContext *C, TransInfo *t)
 {
   TransData *td;
 
@@ -33,7 +34,8 @@ void createTransSculpt(bContext *C, TransInfo *t)
     return;
   }
 
-  Object *ob = OBACT(t->view_layer);
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Object *ob = BKE_view_layer_active_object_get(t->view_layer);
   SculptSession *ss = ob->sculpt;
 
   {
@@ -85,7 +87,7 @@ void createTransSculpt(bContext *C, TransInfo *t)
   copy_m3_m4(td->axismtx, ob->obmat);
 
   BLI_assert(!(t->options & CTX_PAINT_CURVE));
-  ED_sculpt_init_transform(C, ob);
+  ED_sculpt_init_transform(C, ob, t->undo_name);
 }
 
 /** \} */
@@ -94,13 +96,14 @@ void createTransSculpt(bContext *C, TransInfo *t)
 /** \name Recalc Data object
  * \{ */
 
-void recalcData_sculpt(TransInfo *t)
+static void recalcData_sculpt(TransInfo *t)
 {
-  Object *ob = OBACT(t->view_layer);
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Object *ob = BKE_view_layer_active_object_get(t->view_layer);
   ED_sculpt_update_modal_transform(t->context, ob);
 }
 
-void special_aftertrans_update__sculpt(bContext *C, TransInfo *t)
+static void special_aftertrans_update__sculpt(bContext *C, TransInfo *t)
 {
   Scene *scene = t->scene;
   if (!BKE_id_is_editable(CTX_data_main(C), &scene->id)) {
@@ -108,9 +111,17 @@ void special_aftertrans_update__sculpt(bContext *C, TransInfo *t)
     return;
   }
 
-  Object *ob = OBACT(t->view_layer);
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Object *ob = BKE_view_layer_active_object_get(t->view_layer);
   BLI_assert(!(t->options & CTX_PAINT_CURVE));
   ED_sculpt_end_transform(C, ob);
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Sculpt = {
+    /* flags */ 0,
+    /* createTransData */ createTransSculpt,
+    /* recalcData */ recalcData_sculpt,
+    /* special_aftertrans_update */ special_aftertrans_update__sculpt,
+};
diff --git a/source/blender/editors/transform/transform_convert_sequencer.c b/source/blender/editors/transform/transform_convert_sequencer.c
index dcc1739606f..ddc99caeef5 100644
--- a/source/blender/editors/transform/transform_convert_sequencer.c
+++ b/source/blender/editors/transform/transform_convert_sequencer.c
@@ -465,7 +465,7 @@ static SeqCollection *query_time_dependent_strips_strips(TransInfo *t)
   return dependent;
 }
 
-void createTransSeqData(TransInfo *t)
+static void createTransSeqData(bContext *UNUSED(C), TransInfo *t)
 {
   Scene *scene = t->scene;
   Editing *ed = SEQ_editing_get(t->scene);
@@ -659,7 +659,7 @@ static void flushTransSeq(TransInfo *t)
   SEQ_collection_free(transformed_strips);
 }
 
-void recalcData_sequencer(TransInfo *t)
+static void recalcData_sequencer(TransInfo *t)
 {
   TransData *td;
   int a;
@@ -689,7 +689,7 @@ void recalcData_sequencer(TransInfo *t)
 /** \name Special After Transform Sequencer
  * \{ */
 
-void special_aftertrans_update__sequencer(bContext *UNUSED(C), TransInfo *t)
+static void special_aftertrans_update__sequencer(bContext *UNUSED(C), TransInfo *t)
 {
   if (t->state == TRANS_CANCEL) {
     return;
@@ -708,12 +708,12 @@ void special_aftertrans_update__sequencer(bContext *UNUSED(C), TransInfo *t)
     if (t->mode == TFM_SEQ_SLIDE) {
       if (t->frame_side == 'B') {
         ED_markers_post_apply_transform(
-            &t->scene->markers, t->scene, TFM_TIME_TRANSLATE, t->values[0], t->frame_side);
+            &t->scene->markers, t->scene, TFM_TIME_TRANSLATE, t->values_final[0], t->frame_side);
       }
     }
     else if (ELEM(t->frame_side, 'L', 'R')) {
       ED_markers_post_apply_transform(
-          &t->scene->markers, t->scene, TFM_TIME_EXTEND, t->values[0], t->frame_side);
+          &t->scene->markers, t->scene, TFM_TIME_EXTEND, t->values_final[0], t->frame_side);
     }
   }
 }
@@ -734,3 +734,10 @@ void transform_convert_sequencer_channel_clamp(TransInfo *t, float r_val[2])
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Sequencer = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransSeqData,
+    /* recalcData */ recalcData_sequencer,
+    /* special_aftertrans_update */ special_aftertrans_update__sequencer,
+};
diff --git a/source/blender/editors/transform/transform_convert_sequencer_image.c b/source/blender/editors/transform/transform_convert_sequencer_image.c
index 8be454b540c..3d0c3ddaa4c 100644
--- a/source/blender/editors/transform/transform_convert_sequencer_image.c
+++ b/source/blender/editors/transform/transform_convert_sequencer_image.c
@@ -105,7 +105,7 @@ static void freeSeqData(TransInfo *UNUSED(t),
   MEM_freeN(td->extra);
 }
 
-void createTransSeqImageData(TransInfo *t)
+static void createTransSeqImageData(bContext *UNUSED(C), TransInfo *t)
 {
   Editing *ed = SEQ_editing_get(t->scene);
   const SpaceSeq *sseq = t->area->spacedata.first;
@@ -191,7 +191,7 @@ static bool autokeyframe_sequencer_image(bContext *C,
   return changed;
 }
 
-void recalcData_sequencer_image(TransInfo *t)
+static void recalcData_sequencer_image(TransInfo *t)
 {
   TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_SINGLE(t);
   TransData *td = NULL;
@@ -247,7 +247,7 @@ void recalcData_sequencer_image(TransInfo *t)
   }
 }
 
-void special_aftertrans_update__sequencer_image(bContext *UNUSED(C), TransInfo *t)
+static void special_aftertrans_update__sequencer_image(bContext *UNUSED(C), TransInfo *t)
 {
 
   TransDataContainer *tc = TRANS_DATA_CONTAINER_FIRST_SINGLE(t);
@@ -271,3 +271,10 @@ void special_aftertrans_update__sequencer_image(bContext *UNUSED(C), TransInfo *
     }
   }
 }
+
+TransConvertTypeInfo TransConvertType_SequencerImage = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransSeqImageData,
+    /* recalcData */ recalcData_sequencer_image,
+    /* special_aftertrans_update */ special_aftertrans_update__sequencer_image,
+};
diff --git a/source/blender/editors/transform/transform_convert_tracking.c b/source/blender/editors/transform/transform_convert_tracking.c
index d447cd71a40..c0c660289a5 100644
--- a/source/blender/editors/transform/transform_convert_tracking.c
+++ b/source/blender/editors/transform/transform_convert_tracking.c
@@ -518,7 +518,7 @@ static void createTransTrackingCurvesData(bContext *C, TransInfo *t)
   }
 }
 
-void createTransTrackingData(bContext *C, TransInfo *t)
+static void createTransTrackingData(bContext *C, TransInfo *t)
 {
   ARegion *region = CTX_wm_region(C);
   SpaceClip *sc = CTX_wm_space_clip(C);
@@ -694,7 +694,7 @@ static void flushTransTracking(TransInfo *t)
   }
 }
 
-void recalcData_tracking(TransInfo *t)
+static void recalcData_tracking(TransInfo *t)
 {
   SpaceClip *sc = t->area->spacedata.first;
 
@@ -747,7 +747,7 @@ void recalcData_tracking(TransInfo *t)
 /** \name Special After Transform Tracking
  * \{ */
 
-void special_aftertrans_update__movieclip(bContext *C, TransInfo *t)
+static void special_aftertrans_update__movieclip(bContext *C, TransInfo *t)
 {
   SpaceClip *sc = t->area->spacedata.first;
   MovieClip *clip = ED_space_clip_get_clip(sc);
@@ -790,3 +790,10 @@ void special_aftertrans_update__movieclip(bContext *C, TransInfo *t)
 }
 
 /** \} */
+
+TransConvertTypeInfo TransConvertType_Tracking = {
+    /* flags */ (T_POINTS | T_2D_EDIT),
+    /* createTransData */ createTransTrackingData,
+    /* recalcData */ recalcData_tracking,
+    /* special_aftertrans_update */ special_aftertrans_update__movieclip,
+};
diff --git a/source/blender/editors/transform/transform_draw_cursors.c b/source/blender/editors/transform/transform_draw_cursors.c
index 42942493dc3..b5a8decc390 100644
--- a/source/blender/editors/transform/transform_draw_cursors.c
+++ b/source/blender/editors/transform/transform_draw_cursors.c
@@ -116,7 +116,7 @@ void transform_draw_cursor_draw(bContext *UNUSED(C), int x, int y, void *customd
   /* Dashed lines first. */
   if (ELEM(t->helpline, HLP_SPRING, HLP_ANGLE)) {
     GPU_line_width(DASH_WIDTH);
-    immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
     immUniform2f("viewport_size", viewport_size[2], viewport_size[3]);
     immUniform1i("colors_len", 0); /* "simple" mode */
     immUniformThemeColor3(TH_VIEW_OVERLAY);
diff --git a/source/blender/editors/transform/transform_generics.c b/source/blender/editors/transform/transform_generics.c
index e45cac36736..03c53e1b3d2 100644
--- a/source/blender/editors/transform/transform_generics.c
+++ b/source/blender/editors/transform/transform_generics.c
@@ -176,7 +176,8 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 {
   Scene *sce = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
-  Object *obact = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(sce, view_layer);
+  Object *obact = BKE_view_layer_active_object_get(view_layer);
   const eObjectMode object_mode = obact ? obact->mode : OB_MODE_OBJECT;
   ToolSettings *ts = CTX_data_tool_settings(C);
   ARegion *region = CTX_wm_region(C);
@@ -333,7 +334,8 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
   }
   else if (t->spacetype == SPACE_IMAGE) {
     SpaceImage *sima = area->spacedata.first;
-    if (ED_space_image_show_uvedit(sima, OBACT(t->view_layer))) {
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    if (ED_space_image_show_uvedit(sima, BKE_view_layer_active_object_get(t->view_layer))) {
       /* UV transform */
     }
     else if (sima->mode == SI_MODE_MASK) {
@@ -555,7 +557,7 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
   }
   else {
     /* Release confirms preference should not affect node editor (T69288, T70504). */
-    if (ISMOUSE(t->launch_event) &&
+    if (ISMOUSE_BUTTON(t->launch_event) &&
         ((U.flag & USER_RELEASECONFIRM) || (t->spacetype == SPACE_NODE))) {
       /* Global "release confirm" on mouse bindings */
       t->flag |= T_RELEASE_CONFIRM;
@@ -1066,8 +1068,8 @@ bool calculateCenterActive(TransInfo *t, bool select_only, float r_center[3])
     }
   }
   else if (t->options & CTX_POSE_BONE) {
-    ViewLayer *view_layer = t->view_layer;
-    Object *ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    Object *ob = BKE_view_layer_active_object_get(t->view_layer);
     if (ED_object_calc_active_center_for_posemode(ob, select_only, r_center)) {
       mul_m4_v3(ob->obmat, r_center);
       return true;
@@ -1083,11 +1085,10 @@ bool calculateCenterActive(TransInfo *t, bool select_only, float r_center[3])
   }
   else {
     /* object mode */
-    ViewLayer *view_layer = t->view_layer;
-    Object *ob = OBACT(view_layer);
-    Base *base = BASACT(view_layer);
-    if (ob && ((!select_only) || ((base->flag & BASE_SELECTED) != 0))) {
-      copy_v3_v3(r_center, ob->obmat[3]);
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    Base *base = BKE_view_layer_active_base_get(t->view_layer);
+    if (base && ((!select_only) || ((base->flag & BASE_SELECTED) != 0))) {
+      copy_v3_v3(r_center, base->object->obmat[3]);
       return true;
     }
   }
@@ -1132,6 +1133,33 @@ static void calculateCenter_FromAround(TransInfo *t, int around, float r_center[
   }
 }
 
+static void calculateZfac(TransInfo *t)
+{
+  /* ED_view3d_calc_zfac() defines a factor for perspective depth correction,
+   * used in ED_view3d_win_to_delta() */
+
+  /* zfac is only used convertViewVec only in cases operator was invoked in RGN_TYPE_WINDOW
+   * and never used in other cases.
+   *
+   * We need special case here as well, since ED_view3d_calc_zfac will crash when called
+   * for a region different from RGN_TYPE_WINDOW.
+   */
+  if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
+    t->zfac = ED_view3d_calc_zfac(t->region->regiondata, t->center_global);
+  }
+  else if (t->spacetype == SPACE_IMAGE) {
+    SpaceImage *sima = t->area->spacedata.first;
+    t->zfac = 1.0f / sima->zoom;
+  }
+  else if (t->region) {
+    View2D *v2d = &t->region->v2d;
+    /* Get zoom fac the same way as in
+     * `ui_view2d_curRect_validate_resize` - better keep in sync! */
+    const float zoomx = (float)(BLI_rcti_size_x(&v2d->mask) + 1) / BLI_rctf_size_x(&v2d->cur);
+    t->zfac = 1.0f / zoomx;
+  }
+}
+
 void calculateCenter(TransInfo *t)
 {
   if ((t->flag & T_OVERRIDE_CENTER) == 0) {
@@ -1166,22 +1194,46 @@ void calculateCenter(TransInfo *t)
     }
   }
 
-  if (t->spacetype == SPACE_VIEW3D) {
-    /* #ED_view3d_calc_zfac() defines a factor for perspective depth correction,
-     * used in #ED_view3d_win_to_delta(). */
+  calculateZfac(t);
+}
 
-    /* NOTE: `t->zfac` is only used #convertViewVec only in cases operator was invoked in
-     * #RGN_TYPE_WINDOW and never used in other cases.
-     *
-     * We need special case here as well, since #ED_view3d_calc_zfac will crash when called
-     * for a region different from #RGN_TYPE_WINDOW. */
-    if (t->region->regiontype == RGN_TYPE_WINDOW) {
-      t->zfac = ED_view3d_calc_zfac(t->region->regiondata, t->center_global);
+/* Called every time the view changes due to navigation.
+ * Adjusts the mouse position relative to the object. */
+void tranformViewUpdate(TransInfo *t)
+{
+  float zoom_prev = t->zfac;
+  float zoom_new;
+  if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
+    if (!t->persp) {
+      zoom_prev *= len_v3(t->persinv[0]);
     }
-    else {
-      t->zfac = 0.0f;
+
+    setTransformViewMatrices(t);
+    calculateZfac(t);
+
+    zoom_new = t->zfac;
+    if (!t->persp) {
+      zoom_new *= len_v3(t->persinv[0]);
+    }
+
+    for (int i = 0; i < ARRAY_SIZE(t->orient); i++) {
+      if (t->orient[i].type == V3D_ORIENT_VIEW) {
+        copy_m3_m4(t->orient[i].matrix, t->viewinv);
+        normalize_m3(t->orient[i].matrix);
+        if (t->orient_curr == i) {
+          copy_m3_m3(t->spacemtx, t->orient[i].matrix);
+          invert_m3_m3_safe_ortho(t->spacemtx_inv, t->spacemtx);
+        }
+      }
     }
   }
+  else {
+    calculateZfac(t);
+    zoom_new = t->zfac;
+  }
+
+  calculateCenter2D(t);
+  transform_input_update(t, zoom_prev / zoom_new);
 }
 
 void calculatePropRatio(TransInfo *t)
@@ -1413,6 +1465,7 @@ Object *transform_object_deform_pose_armature_get(const TransInfo *t, Object *ob
    * Lines below just check is also visible. */
   Object *ob_armature = BKE_modifiers_is_deformed_by_armature(ob);
   if (ob_armature && ob_armature->mode & OB_MODE_POSE) {
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
     Base *base_arm = BKE_view_layer_base_find(t->view_layer, ob_armature);
     if (base_arm) {
       View3D *v3d = t->view;
diff --git a/source/blender/editors/transform/transform_gizmo_2d.c b/source/blender/editors/transform/transform_gizmo_2d.c
index 426b338f8a7..a6eb25975e9 100644
--- a/source/blender/editors/transform/transform_gizmo_2d.c
+++ b/source/blender/editors/transform/transform_gizmo_2d.c
@@ -236,7 +236,7 @@ static bool gizmo2d_calc_bounds(const bContext *C, float *r_center, float *r_min
     ViewLayer *view_layer = CTX_data_view_layer(C);
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-        view_layer, NULL, &objects_len);
+        scene, view_layer, NULL, &objects_len);
     if (ED_uvedit_minmax_multi(scene, objects, objects_len, r_min, r_max)) {
       has_select = true;
     }
diff --git a/source/blender/editors/transform/transform_gizmo_3d.c b/source/blender/editors/transform/transform_gizmo_3d.c
index 5b749e05052..8e6a6c2c411 100644
--- a/source/blender/editors/transform/transform_gizmo_3d.c
+++ b/source/blender/editors/transform/transform_gizmo_3d.c
@@ -639,7 +639,8 @@ int ED_transform_calc_gizmo_stats(const bContext *C,
                                  (params->orientation_index - 1) :
                                  BKE_scene_orientation_get_index(scene, SCE_ORIENT_DEFAULT);
 
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   Object *obedit = OBEDIT_FROM_OBACT(ob);
   if (ob && ob->mode & OB_MODE_WEIGHT_PAINT) {
     Object *obpose = BKE_object_pose_armature_get(ob);
@@ -753,7 +754,7 @@ int ED_transform_calc_gizmo_stats(const bContext *C,
     invert_m4_m4(obedit->imat, obedit->obmat); \
     uint objects_len = 0; \
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode( \
-        view_layer, CTX_wm_view3d(C), &objects_len); \
+        scene, view_layer, CTX_wm_view3d(C), &objects_len); \
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) { \
       Object *ob_iter = objects[ob_index]; \
       const bool use_mat_local = (ob_iter != obedit);
@@ -941,7 +942,7 @@ int ED_transform_calc_gizmo_stats(const bContext *C,
     invert_m4_m4(ob->imat, ob->obmat);
 
     uint objects_len = 0;
-    Object **objects = BKE_object_pose_array_get(view_layer, v3d, &objects_len);
+    Object **objects = BKE_object_pose_array_get(scene, view_layer, v3d, &objects_len);
 
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
       Object *ob_iter = objects[ob_index];
@@ -1014,13 +1015,14 @@ int ED_transform_calc_gizmo_stats(const bContext *C,
   else {
 
     /* we need the one selected object, if its not active */
-    base = BASACT(view_layer);
-    ob = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    base = BKE_view_layer_active_base_get(view_layer);
+    ob = base ? base->object : NULL;
     if (base && ((base->flag & BASE_SELECTED) == 0)) {
       ob = NULL;
     }
 
-    for (base = view_layer->object_bases.first; base; base = base->next) {
+    for (base = BKE_view_layer_object_bases_get(view_layer)->first; base; base = base->next) {
       if (!BASE_SELECTED_EDITABLE(v3d, base)) {
         continue;
       }
@@ -1103,7 +1105,8 @@ static void gizmo_prepare_mat(const bContext *C,
           /* pass */
         }
         else {
-          Object *ob = OBACT(view_layer);
+          BKE_view_layer_synced_ensure(scene, view_layer);
+          Object *ob = BKE_view_layer_active_object_get(view_layer);
           if (ob != NULL) {
             if ((ob->mode & OB_MODE_ALL_SCULPT) && ob->sculpt) {
               SculptSession *ss = ob->sculpt;
diff --git a/source/blender/editors/transform/transform_gizmo_extrude_3d.c b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
index 131a7fd517f..0271f8e1988 100644
--- a/source/blender/editors/transform/transform_gizmo_extrude_3d.c
+++ b/source/blender/editors/transform/transform_gizmo_extrude_3d.c
@@ -101,7 +101,7 @@ static void gizmo_mesh_extrude_orientation_matrix_set_for_adjust(struct GizmoExt
   for (int j = 0; j < 3; j++) {
     copy_v3_v3(ggd->adjust[0]->matrix_basis[j], mat[j]);
   }
-  /* nop when (i == 2). */
+  /* NOP when (i == 2). */
   swap_v3_v3(ggd->adjust[0]->matrix_basis[ggd->adjust_axis], ggd->adjust[0]->matrix_basis[2]);
 }
 
@@ -261,7 +261,7 @@ static void gizmo_mesh_extrude_refresh(const bContext *C, wmGizmoGroup *gzgroup)
     copy_m3_m3(ggd->data.normal_mat3, tbounds_normal.axis);
   }
 
-  /* TODO(campbell): run second since this modifies the 3D view, it should not. */
+  /* TODO(@campbellbarton): run second since this modifies the 3D view, it should not. */
   if (!ED_transform_calc_gizmo_stats(C,
                                      &(struct TransformCalcParams){
                                          .orientation_index = ggd->data.orientation_index + 1,
diff --git a/source/blender/editors/transform/transform_input.c b/source/blender/editors/transform/transform_input.c
index 3b320ff51d5..38dbe742279 100644
--- a/source/blender/editors/transform/transform_input.c
+++ b/source/blender/editors/transform/transform_input.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 
 #include "DNA_screen_types.h"
+#include "DNA_space_types.h"
 
 #include "BKE_context.h"
 
@@ -18,6 +19,7 @@
 #include "WM_types.h"
 
 #include "transform.h"
+#include "transform_mode.h"
 
 #include "MEM_guardedalloc.h"
 
@@ -251,11 +253,8 @@ void setCustomPointsFromDirection(TransInfo *t, MouseInput *mi, const float dir[
 /** \name Setup & Handle Mouse Input
  * \{ */
 
-void initMouseInput(TransInfo *UNUSED(t),
-                    MouseInput *mi,
-                    const float center[2],
-                    const int mval[2],
-                    const bool precision)
+void initMouseInput(
+    TransInfo *t, MouseInput *mi, const float center[2], const int mval[2], const bool precision)
 {
   mi->factor = 0;
   mi->precision = precision;
@@ -266,14 +265,20 @@ void initMouseInput(TransInfo *UNUSED(t),
   mi->imval[0] = mval[0];
   mi->imval[1] = mval[1];
 
+  if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
+    float delta[3] = {mval[0] - center[0], mval[1] - center[1]};
+    ED_view3d_win_to_delta(t->region, delta, t->zfac, delta);
+    add_v3_v3v3(mi->imval_unproj, t->center_global, delta);
+  }
+
   mi->post = NULL;
 }
 
 static void calcSpringFactor(MouseInput *mi)
 {
-  mi->factor = sqrtf(
-      ((float)(mi->center[1] - mi->imval[1])) * ((float)(mi->center[1] - mi->imval[1])) +
-      ((float)(mi->center[0] - mi->imval[0])) * ((float)(mi->center[0] - mi->imval[0])));
+  float mdir[2] = {(float)(mi->center[1] - mi->imval[1]), (float)(mi->center[0] - mi->imval[0])};
+
+  mi->factor = len_v2(mdir);
 
   if (mi->factor == 0.0f) {
     mi->factor = 1.0f; /* prevent Inf */
@@ -441,4 +446,52 @@ void applyMouseInput(TransInfo *t, MouseInput *mi, const int mval[2], float outp
   }
 }
 
+void transform_input_update(TransInfo *t, const float fac)
+{
+  MouseInput *mi = &t->mouse;
+  t->mouse.factor *= fac;
+  if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
+    projectIntView(t, mi->imval_unproj, mi->imval);
+  }
+  else {
+    int offset[2], center_2d_int[2] = {mi->center[0], mi->center[1]};
+    sub_v2_v2v2_int(offset, mi->imval, center_2d_int);
+    offset[0] *= fac;
+    offset[1] *= fac;
+
+    center_2d_int[0] = t->center2d[0];
+    center_2d_int[1] = t->center2d[1];
+    add_v2_v2v2_int(mi->imval, center_2d_int, offset);
+  }
+
+  float center_old[2];
+  copy_v2_v2(center_old, mi->center);
+  copy_v2_v2(mi->center, t->center2d);
+
+  if (mi->use_virtual_mval) {
+    /* Update accumulator. */
+    double mval_delta[2];
+    sub_v2_v2v2_db(mval_delta, mi->virtual_mval.accum, mi->virtual_mval.prev);
+    mval_delta[0] *= fac;
+    mval_delta[1] *= fac;
+    copy_v2_v2_db(mi->virtual_mval.accum, mi->virtual_mval.prev);
+    add_v2_v2_db(mi->virtual_mval.accum, mval_delta);
+  }
+
+  if (ELEM(mi->apply, InputAngle, InputAngleSpring)) {
+    float offset_center[2];
+    sub_v2_v2v2(offset_center, mi->center, center_old);
+    struct InputAngle_Data *data = mi->data;
+    data->mval_prev[0] += offset_center[0];
+    data->mval_prev[1] += offset_center[1];
+  }
+
+  if (t->mode == TFM_EDGE_SLIDE) {
+    transform_mode_edge_slide_reproject_input(t);
+  }
+  else if (t->mode == TFM_VERT_SLIDE) {
+    transform_mode_vert_slide_reproject_input(t);
+  }
+}
+
 /** \} */
diff --git a/source/blender/editors/transform/transform_mode.c b/source/blender/editors/transform/transform_mode.c
index 5ba0f08ee1c..10ea022757d 100644
--- a/source/blender/editors/transform/transform_mode.c
+++ b/source/blender/editors/transform/transform_mode.c
@@ -292,6 +292,9 @@ void constraintTransLim(const TransInfo *t, TransData *td)
           continue;
         }
 
+        /* Initialize the custom space for use in calculating the matrices. */
+        BKE_constraint_custom_object_space_init(&cob, con);
+
         /* get constraint targets if needed */
         BKE_constraint_targets_for_solving_get(t->depsgraph, con, &cob, &targets, ctime);
 
@@ -941,7 +944,11 @@ void ElementResize(const TransInfo *t,
   if (td->ext && td->ext->size) {
     float fsize[3];
 
-    if (ELEM(t->data_type, TC_SCULPT, TC_OBJECT, TC_OBJECT_TEXSPACE, TC_POSE)) {
+    if (ELEM(t->data_type,
+             &TransConvertType_Sculpt,
+             &TransConvertType_Object,
+             &TransConvertType_ObjectTexSpace,
+             &TransConvertType_Pose)) {
       float obsizemat[3][3];
       /* Reorient the size mat to fit the oriented object. */
       mul_m3_m3m3(obsizemat, tmat, td->axismtx);
@@ -1201,13 +1208,13 @@ void transform_mode_init(TransInfo *t, wmOperator *op, const int mode)
       break;
   }
 
-  if (t->data_type == TC_MESH_VERTS) {
+  if (t->data_type == &TransConvertType_Mesh) {
     /* Init Custom Data correction.
      * Ideally this should be called when creating the TransData. */
     transform_convert_mesh_customdatacorrect_init(t);
   }
 
-  /* TODO(germano): Some of these operations change the `t->mode`.
+  /* TODO(@germano): Some of these operations change the `t->mode`.
    * This can be bad for Redo. */
   // BLI_assert(t->mode == mode);
 }
diff --git a/source/blender/editors/transform/transform_mode.h b/source/blender/editors/transform/transform_mode.h
index eac6734ed88..063de87ebb2 100644
--- a/source/blender/editors/transform/transform_mode.h
+++ b/source/blender/editors/transform/transform_mode.h
@@ -117,6 +117,7 @@ void drawEdgeSlide(TransInfo *t);
 void initEdgeSlide_ex(
     TransInfo *t, bool use_double_side, bool use_even, bool flipped, bool use_clamp);
 void initEdgeSlide(TransInfo *t);
+void transform_mode_edge_slide_reproject_input(TransInfo *t);
 
 /* transform_mode_gpopacity.c */
 
@@ -191,3 +192,4 @@ void initTranslation(TransInfo *t);
 void drawVertSlide(TransInfo *t);
 void initVertSlide_ex(TransInfo *t, bool use_even, bool flipped, bool use_clamp);
 void initVertSlide(TransInfo *t);
+void transform_mode_vert_slide_reproject_input(TransInfo *t);
diff --git a/source/blender/editors/transform/transform_mode_bend.c b/source/blender/editors/transform/transform_mode_bend.c
index acc6b20810f..a48f84ef0bc 100644
--- a/source/blender/editors/transform/transform_mode_bend.c
+++ b/source/blender/editors/transform/transform_mode_bend.c
@@ -262,7 +262,7 @@ static void Bend(TransInfo *t, const int UNUSED(mval[2]))
                  +values.scale * shell_angle_to_dist((float)M_PI_2 + values.angle));
   }
 
-  /* TODO(campbell): xform, compensate object center. */
+  /* TODO(@campbellbarton): xform, compensate object center. */
   FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 
     float warp_sta_local[3];
diff --git a/source/blender/editors/transform/transform_mode_curveshrinkfatten.c b/source/blender/editors/transform/transform_mode_curveshrinkfatten.c
index aa4d608de04..f7f9e14b8ac 100644
--- a/source/blender/editors/transform/transform_mode_curveshrinkfatten.c
+++ b/source/blender/editors/transform/transform_mode_curveshrinkfatten.c
@@ -64,10 +64,8 @@ static void applyCurveShrinkFatten(TransInfo *t, const int UNUSED(mval[2]))
       if (td->val) {
         *td->val = td->ival * ratio;
         /* apply PET */
-        *td->val = (*td->val * td->factor) + ((1.0f - td->factor) * td->ival);
-        if (*td->val <= 0.0f) {
-          *td->val = 0.001f;
-        }
+        *td->val = interpf(*td->val, td->ival, td->factor);
+        CLAMP_MIN(*td->val, 0.0f);
       }
     }
   }
@@ -93,10 +91,6 @@ void initCurveShrinkFatten(TransInfo *t)
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 
-#ifdef USE_NUM_NO_ZERO
-  t->num.val_flag[0] |= NUM_NO_ZERO;
-#endif
-
   t->flag |= T_NO_CONSTRAINT;
 }
 
diff --git a/source/blender/editors/transform/transform_mode_edge_bevelweight.c b/source/blender/editors/transform/transform_mode_edge_bevelweight.c
index 987d8396907..e96e74b596c 100644
--- a/source/blender/editors/transform/transform_mode_edge_bevelweight.c
+++ b/source/blender/editors/transform/transform_mode_edge_bevelweight.c
@@ -44,16 +44,11 @@ static void transdata_elem_bevel_weight(const TransInfo *UNUSED(t),
                                         TransData *td,
                                         const float weight)
 {
-  if (td->val == NULL) {
+  if (td->loc == NULL) {
     return;
   }
-  *td->val = td->ival + weight * td->factor;
-  if (*td->val < 0.0f) {
-    *td->val = 0.0f;
-  }
-  if (*td->val > 1.0f) {
-    *td->val = 1.0f;
-  }
+  *td->loc = td->iloc[0] + weight * td->factor;
+  CLAMP(*td->loc, 0.0f, 1.0f);
 }
 
 static void transdata_elem_bevel_weight_fn(void *__restrict iter_data_v,
diff --git a/source/blender/editors/transform/transform_mode_edge_crease.c b/source/blender/editors/transform/transform_mode_edge_crease.c
index f1acc2a4c9a..1a3ccf30387 100644
--- a/source/blender/editors/transform/transform_mode_edge_crease.c
+++ b/source/blender/editors/transform/transform_mode_edge_crease.c
@@ -44,17 +44,12 @@ static void transdata_elem_crease(const TransInfo *UNUSED(t),
                                   TransData *td,
                                   const float crease)
 {
-  if (td->val == NULL) {
+  if (td->loc == NULL) {
     return;
   }
 
-  *td->val = td->ival + crease * td->factor;
-  if (*td->val < 0.0f) {
-    *td->val = 0.0f;
-  }
-  if (*td->val > 1.0f) {
-    *td->val = 1.0f;
-  }
+  *td->loc = td->iloc[0] + crease * td->factor;
+  CLAMP(*td->loc, 0.0f, 1.0f);
 }
 
 static void transdata_elem_crease_fn(void *__restrict iter_data_v,
diff --git a/source/blender/editors/transform/transform_mode_edge_slide.c b/source/blender/editors/transform/transform_mode_edge_slide.c
index a3c49d2362f..8a29321413e 100644
--- a/source/blender/editors/transform/transform_mode_edge_slide.c
+++ b/source/blender/editors/transform/transform_mode_edge_slide.c
@@ -292,8 +292,75 @@ static BMLoop *get_next_loop(
   return NULL;
 }
 
+static void edge_slide_projmat_get(TransInfo *t, TransDataContainer *tc, float r_projectMat[4][4])
+{
+  RegionView3D *rv3d = NULL;
+
+  if (t->spacetype == SPACE_VIEW3D) {
+    /* Background mode support. */
+    rv3d = t->region ? t->region->regiondata : NULL;
+  }
+
+  if (!rv3d) {
+    /* Ok, let's try to survive this. */
+    unit_m4(r_projectMat);
+  }
+  else {
+    ED_view3d_ob_project_mat_get(rv3d, tc->obedit, r_projectMat);
+  }
+}
+
+static void edge_slide_pair_project(TransDataEdgeSlideVert *sv,
+                                    ARegion *region,
+                                    float projectMat[4][4],
+                                    float r_sco_a[3],
+                                    float r_sco_b[3])
+{
+  BMVert *v = sv->v;
+
+  if (sv->v_side[1]) {
+    ED_view3d_project_float_v3_m4(region, sv->v_side[1]->co, r_sco_b, projectMat);
+  }
+  else {
+    add_v3_v3v3(r_sco_b, v->co, sv->dir_side[1]);
+    ED_view3d_project_float_v3_m4(region, r_sco_b, r_sco_b, projectMat);
+  }
+
+  if (sv->v_side[0]) {
+    ED_view3d_project_float_v3_m4(region, sv->v_side[0]->co, r_sco_a, projectMat);
+  }
+  else {
+    add_v3_v3v3(r_sco_a, v->co, sv->dir_side[0]);
+    ED_view3d_project_float_v3_m4(region, r_sco_a, r_sco_a, projectMat);
+  }
+}
+
+static void edge_slide_data_init_mval(MouseInput *mi, EdgeSlideData *sld, float *mval_dir)
+{
+  /* Possible all of the edge loops are pointing directly at the view. */
+  if (UNLIKELY(len_squared_v2(mval_dir) < 0.1f)) {
+    mval_dir[0] = 0.0f;
+    mval_dir[1] = 100.0f;
+  }
+
+  float mval_start[2], mval_end[2];
+
+  /* Zero out Start. */
+  zero_v2(mval_start);
+
+  /* dir holds a vector along edge loop */
+  copy_v2_v2(mval_end, mval_dir);
+  mul_v2_fl(mval_end, 0.5f);
+
+  sld->mval_start[0] = mi->imval[0] + mval_start[0];
+  sld->mval_start[1] = mi->imval[1] + mval_start[1];
+
+  sld->mval_end[0] = mi->imval[0] + mval_end[0];
+  sld->mval_end[1] = mi->imval[1] + mval_end[1];
+}
+
 /**
- * Calculate screenspace `mval_start` / `mval_end`, optionally slide direction.
+ * Calculate screen-space `mval_start` / `mval_end`, optionally slide direction.
  */
 static void calcEdgeSlide_mval_range(TransInfo *t,
                                      TransDataContainer *tc,
@@ -308,29 +375,20 @@ static void calcEdgeSlide_mval_range(TransInfo *t,
   BMEditMesh *em = BKE_editmesh_from_object(tc->obedit);
   ARegion *region = t->region;
   View3D *v3d = NULL;
-  RegionView3D *rv3d = NULL;
   float projectMat[4][4];
   BMBVHTree *bmbvh;
 
   /* only for use_calc_direction */
   float(*loop_dir)[3] = NULL, *loop_maxdist = NULL;
 
-  float mval_start[2], mval_end[2];
   float mval_dir[3], dist_best_sq;
 
   if (t->spacetype == SPACE_VIEW3D) {
     /* background mode support */
     v3d = t->area ? t->area->spacedata.first : NULL;
-    rv3d = t->region ? t->region->regiondata : NULL;
   }
 
-  if (!rv3d) {
-    /* ok, let's try to survive this */
-    unit_m4(projectMat);
-  }
-  else {
-    ED_view3d_ob_project_mat_get(rv3d, tc->obedit, projectMat);
-  }
+  edge_slide_projmat_get(t, tc, projectMat);
 
   if (use_occlude_geometry) {
     bmbvh = BKE_bmbvh_new_from_editmesh(em, BMBVH_RESPECT_HIDDEN, NULL, false);
@@ -379,21 +437,7 @@ static void calcEdgeSlide_mval_range(TransInfo *t,
         continue;
       }
 
-      if (sv->v_side[1]) {
-        ED_view3d_project_float_v3_m4(region, sv->v_side[1]->co, sco_b, projectMat);
-      }
-      else {
-        add_v3_v3v3(sco_b, v->co, sv->dir_side[1]);
-        ED_view3d_project_float_v3_m4(region, sco_b, sco_b, projectMat);
-      }
-
-      if (sv->v_side[0]) {
-        ED_view3d_project_float_v3_m4(region, sv->v_side[0]->co, sco_a, projectMat);
-      }
-      else {
-        add_v3_v3v3(sco_a, v->co, sv->dir_side[0]);
-        ED_view3d_project_float_v3_m4(region, sco_a, sco_a, projectMat);
-      }
+      edge_slide_pair_project(sv, region, projectMat, sco_a, sco_b);
 
       /* global direction */
       dist_sq = dist_squared_to_line_segment_v2(mval, sco_b, sco_a);
@@ -433,24 +477,7 @@ static void calcEdgeSlide_mval_range(TransInfo *t,
     MEM_freeN(loop_maxdist);
   }
 
-  /* possible all of the edge loops are pointing directly at the view */
-  if (UNLIKELY(len_squared_v2(mval_dir) < 0.1f)) {
-    mval_dir[0] = 0.0f;
-    mval_dir[1] = 100.0f;
-  }
-
-  /* zero out start */
-  zero_v2(mval_start);
-
-  /* dir holds a vector along edge loop */
-  copy_v2_v2(mval_end, mval_dir);
-  mul_v2_fl(mval_end, 0.5f);
-
-  sld->mval_start[0] = t->mval[0] + mval_start[0];
-  sld->mval_start[1] = t->mval[1] + mval_start[1];
-
-  sld->mval_end[0] = t->mval[0] + mval_end[0];
-  sld->mval_end[1] = t->mval[1] + mval_end[1];
+  edge_slide_data_init_mval(&t->mouse, sld, mval_dir);
 
   if (bmbvh) {
     BKE_bmbvh_free(bmbvh);
@@ -466,7 +493,6 @@ static void calcEdgeSlide_even(TransInfo *t,
 
   if (sld->totsv > 0) {
     ARegion *region = t->region;
-    RegionView3D *rv3d = NULL;
     float projectMat[4][4];
 
     int i = 0;
@@ -475,18 +501,7 @@ static void calcEdgeSlide_even(TransInfo *t,
     float dist_sq = 0;
     float dist_min_sq = FLT_MAX;
 
-    if (t->spacetype == SPACE_VIEW3D) {
-      /* background mode support */
-      rv3d = t->region ? t->region->regiondata : NULL;
-    }
-
-    if (!rv3d) {
-      /* ok, let's try to survive this */
-      unit_m4(projectMat);
-    }
-    else {
-      ED_view3d_ob_project_mat_get(rv3d, tc->obedit, projectMat);
-    }
+    edge_slide_projmat_get(t, tc, projectMat);
 
     for (i = 0; i < sld->totsv; i++, sv++) {
       /* Set length */
@@ -1204,7 +1219,7 @@ void drawEdgeSlide(TransInfo *t)
     immUniformThemeColorShadeAlpha(TH_EDGE_SELECT, 80, alpha_shade);
     immBegin(GPU_PRIM_LINES, sld->totsv * 2);
 
-    /* TODO(campbell): Loop over all verts. */
+    /* TODO(@campbellbarton): Loop over all verts. */
     sv = sld->sv;
     for (i = 0; i < sld->totsv; i++, sv++) {
       float a[3], b[3];
@@ -1553,3 +1568,32 @@ void initEdgeSlide(TransInfo *t)
 }
 
 /** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Mouse Input Utilities
+ * \{ */
+
+void transform_mode_edge_slide_reproject_input(TransInfo *t)
+{
+  ARegion *region = t->region;
+
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    EdgeSlideData *sld = tc->custom.mode.data;
+    if (sld) {
+      float projectMat[4][4];
+      edge_slide_projmat_get(t, tc, projectMat);
+
+      TransDataEdgeSlideVert *curr_sv = &sld->sv[sld->curr_sv_index];
+
+      float mval_dir[3], sco_a[3], sco_b[3];
+      edge_slide_pair_project(curr_sv, region, projectMat, sco_a, sco_b);
+      sub_v3_v3v3(mval_dir, sco_b, sco_a);
+      edge_slide_data_init_mval(&t->mouse, sld, mval_dir);
+    }
+  }
+
+  EdgeSlideData *sld = edgeSlideFirstGet(t);
+  setCustomPoints(t, &t->mouse, sld->mval_end, sld->mval_start);
+}
+
+/** \} */
diff --git a/source/blender/editors/transform/transform_mode_gpopacity.c b/source/blender/editors/transform/transform_mode_gpopacity.c
index 83dce17d104..8b9431b65ea 100644
--- a/source/blender/editors/transform/transform_mode_gpopacity.c
+++ b/source/blender/editors/transform/transform_mode_gpopacity.c
@@ -74,7 +74,7 @@ static void applyGPOpacity(TransInfo *t, const int UNUSED(mval[2]))
       if (td->val) {
         *td->val = td->ival * ratio;
         /* apply PET */
-        *td->val = (*td->val * td->factor) + ((1.0f - td->factor) * td->ival);
+        *td->val = interpf(*td->val, td->ival, td->factor);
         CLAMP(*td->val, 0.0f, 1.0f);
       }
     }
diff --git a/source/blender/editors/transform/transform_mode_gpshrinkfatten.c b/source/blender/editors/transform/transform_mode_gpshrinkfatten.c
index 796d5c7ae9c..d8ec7d4ff50 100644
--- a/source/blender/editors/transform/transform_mode_gpshrinkfatten.c
+++ b/source/blender/editors/transform/transform_mode_gpshrinkfatten.c
@@ -74,7 +74,7 @@ static void applyGPShrinkFatten(TransInfo *t, const int UNUSED(mval[2]))
       if (td->val) {
         *td->val = td->ival * ratio;
         /* apply PET */
-        *td->val = (*td->val * td->factor) + ((1.0f - td->factor) * td->ival);
+        *td->val = interpf(*td->val, td->ival, td->factor);
         if (*td->val <= 0.0f) {
           *td->val = 0.001f;
         }
diff --git a/source/blender/editors/transform/transform_mode_maskshrinkfatten.c b/source/blender/editors/transform/transform_mode_maskshrinkfatten.c
index 19a3deade63..e2ccf61796b 100644
--- a/source/blender/editors/transform/transform_mode_maskshrinkfatten.c
+++ b/source/blender/editors/transform/transform_mode_maskshrinkfatten.c
@@ -90,7 +90,7 @@ static void applyMaskShrinkFatten(TransInfo *t, const int UNUSED(mval[2]))
         }
 
         /* apply PET */
-        *td->val = (*td->val * td->factor) + ((1.0f - td->factor) * td->ival);
+        *td->val = interpf(*td->val, td->ival, td->factor);
         if (*td->val <= 0.0f) {
           *td->val = 0.001f;
         }
diff --git a/source/blender/editors/transform/transform_mode_resize.c b/source/blender/editors/transform/transform_mode_resize.c
index 31d40486afc..70599c3577c 100644
--- a/source/blender/editors/transform/transform_mode_resize.c
+++ b/source/blender/editors/transform/transform_mode_resize.c
@@ -11,6 +11,7 @@
 #include "BLI_task.h"
 
 #include "BKE_context.h"
+#include "BKE_image.h"
 #include "BKE_unit.h"
 
 #include "ED_screen.h"
@@ -84,6 +85,98 @@ static void ApplySnapResize(TransInfo *t, float vec[3])
   }
 }
 
+/**
+ * Find the correction for the scaling factor when "Constrain to Bounds" is active.
+ * \param numerator: How far the UV boundary (unit square) is from the origin of the scale.
+ * \param denominator: How far the AABB is from the origin of the scale.
+ * \param scale: Scale parameter to update.
+ */
+static void constrain_scale_to_boundary(const float numerator,
+                                        const float denominator,
+                                        float *scale)
+{
+  if (denominator == 0.0f) {
+    /* The origin of the scale is on the edge of the boundary. */
+    if (numerator < 0.0f) {
+      /* Negative scale will wrap around and put us outside the boundary. */
+      *scale = 0.0f; /* Hold at the boundary instead. */
+    }
+    return; /* Nothing else we can do without more info. */
+  }
+
+  const float correction = numerator / denominator;
+  if (correction < 0.0f || !isfinite(correction)) {
+    /* TODO: Correction is negative or invalid, but we lack context to fix `*scale`. */
+    return;
+  }
+
+  if (denominator < 0.0f) {
+    /* Scale origin is outside boundary, only make scale bigger. */
+    if (*scale < correction) {
+      *scale = correction;
+    }
+    return;
+  }
+
+  /* Scale origin is inside boundary, the "regular" case, limit maximum scale. */
+  if (*scale > correction) {
+    *scale = correction;
+  }
+}
+
+static bool clip_uv_transform_resize(TransInfo *t, float vec[2])
+{
+
+  /* Stores the coordinates of the closest UDIM tile.
+   * Also acts as an offset to the tile from the origin of UV space. */
+  float base_offset[2] = {0.0f, 0.0f};
+
+  /* If tiled image then constrain to correct/closest UDIM tile, else 0-1 UV space. */
+  const SpaceImage *sima = t->area->spacedata.first;
+  BKE_image_find_nearest_tile_with_offset(sima->image, t->center_global, base_offset);
+
+  /* Assume no change is required. */
+  float scale = 1.0f;
+
+  /* Are we scaling U and V together, or just one axis? */
+  const bool adjust_u = !(t->con.mode & CON_AXIS1);
+  const bool adjust_v = !(t->con.mode & CON_AXIS0);
+  const bool use_local_center = transdata_check_local_center(t, t->around);
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    for (TransData *td = tc->data; td < tc->data + tc->data_len; td++) {
+
+      /* Get scale origin. */
+      const float *scale_origin = use_local_center ? td->center : t->center_global;
+
+      /* Alias td->loc as min and max just in case we need to optimize later. */
+      const float *min = td->loc;
+      const float *max = td->loc;
+
+      if (adjust_u) {
+        /* Update U against the left border. */
+        constrain_scale_to_boundary(
+            scale_origin[0] - base_offset[0], scale_origin[0] - min[0], &scale);
+
+        /* Now the right border, negated, because `-1.0 / -1.0 = 1.0` */
+        constrain_scale_to_boundary(
+            base_offset[0] + t->aspect[0] - scale_origin[0], max[0] - scale_origin[0], &scale);
+      }
+
+      /* Do the same for the V co-ordinate. */
+      if (adjust_v) {
+        constrain_scale_to_boundary(
+            scale_origin[1] - base_offset[1], scale_origin[1] - min[1], &scale);
+
+        constrain_scale_to_boundary(
+            base_offset[1] + t->aspect[1] - scale_origin[1], max[1] - scale_origin[1], &scale);
+      }
+    }
+  }
+  vec[0] *= scale;
+  vec[1] *= scale;
+  return scale != 1.0f;
+}
+
 static void applyResize(TransInfo *t, const int UNUSED(mval[2]))
 {
   float mat[3][3];
@@ -157,7 +250,7 @@ static void applyResize(TransInfo *t, const int UNUSED(mval[2]))
   }
 
   /* Evil hack - redo resize if clipping needed. */
-  if (t->flag & T_CLIP_UV && clipUVTransform(t, t->values_final, 1)) {
+  if (t->flag & T_CLIP_UV && clip_uv_transform_resize(t, t->values_final)) {
     size_to_mat3(mat, t->values_final);
 
     if (t->con.mode & CON_APPLY) {
diff --git a/source/blender/editors/transform/transform_mode_rotate.c b/source/blender/editors/transform/transform_mode_rotate.c
index a7207b36578..f3186b21cb9 100644
--- a/source/blender/editors/transform/transform_mode_rotate.c
+++ b/source/blender/editors/transform/transform_mode_rotate.c
@@ -286,9 +286,72 @@ static void applyRotationValue(TransInfo *t,
   }
 }
 
+static bool uv_rotation_in_clip_bounds_test(const TransInfo *t, const float angle)
+{
+  const float cos_angle = cosf(angle);
+  const float sin_angle = sinf(angle);
+  const float *center = t->center_global;
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    TransData *td = tc->data;
+    for (int i = 0; i < tc->data_len; i++, td++) {
+      if (td->flag & TD_SKIP) {
+        continue;
+      }
+      if (td->factor < 1.0f) {
+        continue; /* Proportional edit, will get picked up in next phase. */
+      }
+
+      float uv[2];
+      sub_v2_v2v2(uv, td->iloc, center);
+      float pr[2];
+      pr[0] = cos_angle * uv[0] + sin_angle * uv[1];
+      pr[1] = -sin_angle * uv[0] + cos_angle * uv[1];
+      add_v2_v2(pr, center);
+      /* TODO: UDIM support. */
+      if (pr[0] < 0.0f || 1.0f < pr[0]) {
+        return false;
+      }
+      if (pr[1] < 0.0f || 1.0f < pr[1]) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+static bool clip_uv_transform_rotate(const TransInfo *t, float *vec, float *vec_inside_bounds)
+{
+  float angle = vec[0];
+  if (uv_rotation_in_clip_bounds_test(t, angle)) {
+    vec_inside_bounds[0] = angle; /* Store for next iteration. */
+    return false;                 /* Nothing to do. */
+  }
+  float angle_inside_bounds = vec_inside_bounds[0];
+  if (!uv_rotation_in_clip_bounds_test(t, angle_inside_bounds)) {
+    return false; /* No known way to fix, may as well rotate anyway. */
+  }
+  const int max_i = 32; /* Limit iteration, mainly for debugging. */
+  for (int i = 0; i < max_i; i++) {
+    /* Binary search. */
+    const float angle_mid = (angle_inside_bounds + angle) / 2.0f;
+    if (angle_mid == angle_inside_bounds || angle_mid == angle) {
+      break; /* float precision reached. */
+    }
+    if (uv_rotation_in_clip_bounds_test(t, angle_mid)) {
+      angle_inside_bounds = angle_mid;
+    }
+    else {
+      angle = angle_mid;
+    }
+  }
+
+  vec_inside_bounds[0] = angle_inside_bounds; /* Store for next iteration. */
+  vec[0] = angle_inside_bounds;               /* Update rotation angle. */
+  return true;
+}
+
 static void applyRotation(TransInfo *t, const int UNUSED(mval[2]))
 {
-  char str[UI_MAX_DRAW_STR];
   float axis_final[3];
   float final = t->values[0] + t->values_modal_offset[0];
 
@@ -313,13 +376,27 @@ static void applyRotation(TransInfo *t, const int UNUSED(mval[2]))
 
   t->values_final[0] = final;
 
-  headerRotation(t, str, sizeof(str), final);
-
   const bool is_large_rotation = hasNumInput(&t->num);
   applyRotationValue(t, final, axis_final, is_large_rotation);
 
+  if (t->flag & T_CLIP_UV) {
+    if (clip_uv_transform_rotate(t, t->values_final, t->values_inside_constraints)) {
+      applyRotationValue(t, t->values_final[0], axis_final, is_large_rotation);
+    }
+
+    /* In proportional edit it can happen that */
+    /* vertices in the radius of the brush end */
+    /* outside the clipping area               */
+    /* XXX HACK - dg */
+    if (t->flag & T_PROP_EDIT) {
+      clipUVData(t);
+    }
+  }
+
   recalcData(t);
 
+  char str[UI_MAX_DRAW_STR];
+  headerRotation(t, str, sizeof(str), t->values_final[0]);
   ED_area_status_text(t->area, str);
 }
 
diff --git a/source/blender/editors/transform/transform_mode_translate.c b/source/blender/editors/transform/transform_mode_translate.c
index 65690f9069d..8f6ec7bd98f 100644
--- a/source/blender/editors/transform/transform_mode_translate.c
+++ b/source/blender/editors/transform/transform_mode_translate.c
@@ -16,6 +16,7 @@
 #include "BLI_task.h"
 
 #include "BKE_context.h"
+#include "BKE_image.h"
 #include "BKE_report.h"
 #include "BKE_unit.h"
 
@@ -434,6 +435,48 @@ static void applyTranslationValue(TransInfo *t, const float vec[3])
   custom_data->prev.rotate_mode = rotate_mode;
 }
 
+static bool clip_uv_transform_translation(TransInfo *t, float vec[2])
+{
+  /* Stores the coordinates of the closest UDIM tile.
+   * Also acts as an offset to the tile from the origin of UV space. */
+  float base_offset[2] = {0.0f, 0.0f};
+
+  /* If tiled image then constrain to correct/closest UDIM tile, else 0-1 UV space. */
+  const SpaceImage *sima = t->area->spacedata.first;
+  BKE_image_find_nearest_tile_with_offset(sima->image, t->center_global, base_offset);
+
+  float min[2], max[2];
+  min[0] = min[1] = FLT_MAX;
+  max[0] = max[1] = -FLT_MAX;
+
+  FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+    for (TransData *td = tc->data; td < tc->data + tc->data_len; td++) {
+      minmax_v2v2_v2(min, max, td->loc);
+    }
+  }
+
+  bool result = false;
+  if (min[0] < base_offset[0]) {
+    vec[0] += base_offset[0] - min[0];
+    result = true;
+  }
+  else if (max[0] > base_offset[0] + t->aspect[0]) {
+    vec[0] -= max[0] - base_offset[0] - t->aspect[0];
+    result = true;
+  }
+
+  if (min[1] < base_offset[1]) {
+    vec[1] += base_offset[1] - min[1];
+    result = true;
+  }
+  else if (max[1] > base_offset[1] + t->aspect[1]) {
+    vec[1] -= max[1] - base_offset[1] - t->aspect[1];
+    result = true;
+  }
+
+  return result;
+}
+
 static void applyTranslation(TransInfo *t, const int UNUSED(mval[2]))
 {
   char str[UI_MAX_DRAW_STR];
@@ -498,7 +541,7 @@ static void applyTranslation(TransInfo *t, const int UNUSED(mval[2]))
   applyTranslationValue(t, global_dir);
 
   /* evil hack - redo translation if clipping needed */
-  if (t->flag & T_CLIP_UV && clipUVTransform(t, global_dir, 0)) {
+  if (t->flag & T_CLIP_UV && clip_uv_transform_translation(t, global_dir)) {
     applyTranslationValue(t, global_dir);
 
     /* In proportional edit it can happen that */
diff --git a/source/blender/editors/transform/transform_mode_vert_slide.c b/source/blender/editors/transform/transform_mode_vert_slide.c
index 674ffcf17a8..d7c4d862b23 100644
--- a/source/blender/editors/transform/transform_mode_vert_slide.c
+++ b/source/blender/editors/transform/transform_mode_vert_slide.c
@@ -68,7 +68,7 @@ typedef struct VertSlideParams {
   bool flipped;
 } VertSlideParams;
 
-static void calcVertSlideCustomPoints(struct TransInfo *t)
+static void vert_slide_update_input(TransInfo *t)
 {
   VertSlideParams *slp = t->custom.mode.data;
   VertSlideData *sld = TRANS_DATA_CONTAINER_FIRST_OK(t)->custom.mode.data;
@@ -94,6 +94,11 @@ static void calcVertSlideCustomPoints(struct TransInfo *t)
   else {
     setCustomPoints(t, &t->mouse, mval_end, mval_start);
   }
+}
+
+static void calcVertSlideCustomPoints(struct TransInfo *t)
+{
+  vert_slide_update_input(t);
 
   /* setCustomPoints isn't normally changing as the mouse moves,
    * in this case apply mouse input immediately so we don't refresh
@@ -673,3 +678,22 @@ void initVertSlide(TransInfo *t)
 }
 
 /** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Mouse Input Utilities
+ * \{ */
+
+void transform_mode_vert_slide_reproject_input(TransInfo *t)
+{
+  if (t->spacetype == SPACE_VIEW3D) {
+    RegionView3D *rv3d = t->region->regiondata;
+    FOREACH_TRANS_DATA_CONTAINER (t, tc) {
+      VertSlideData *sld = tc->custom.mode.data;
+      ED_view3d_ob_project_mat_get(rv3d, tc->obedit, sld->proj_mat);
+    }
+  }
+
+  vert_slide_update_input(t);
+}
+
+/** \} */
diff --git a/source/blender/editors/transform/transform_ops.c b/source/blender/editors/transform/transform_ops.c
index a64eff8f981..99919c0ed78 100644
--- a/source/blender/editors/transform/transform_ops.c
+++ b/source/blender/editors/transform/transform_ops.c
@@ -379,6 +379,8 @@ static int transformops_data(bContext *C, wmOperator *op, const wmEvent *event)
   if (op->customdata == NULL) {
     TransInfo *t = MEM_callocN(sizeof(TransInfo), "TransInfo data2");
 
+    t->undo_name = op->type->name;
+
     int mode = transformops_mode(op);
     retval = initTransform(C, t, op, event, mode);
 
@@ -566,6 +568,17 @@ static bool transform_poll_property(const bContext *UNUSED(C),
     }
   }
 
+  /* Snapping. */
+  {
+    PropertyRNA *prop_snap = RNA_struct_find_property(op->ptr, "snap");
+    if (prop_snap && (prop_snap != prop) &&
+        (RNA_property_boolean_get(op->ptr, prop_snap) == false)) {
+      if (STRPREFIX(prop_id, "snap") || STRPREFIX(prop_id, "use_snap")) {
+        return false;
+      }
+    }
+  }
+
   return true;
 }
 
@@ -644,28 +657,63 @@ void Transform_Properties(struct wmOperatorType *ot, int flags)
   }
 
   if (flags & P_SNAP) {
-    prop = RNA_def_boolean(ot->srna, "snap", 0, "Use Snapping Options", "");
+    prop = RNA_def_boolean(ot->srna, "snap", false, "Use Snapping Options", "");
     RNA_def_property_flag(prop, PROP_HIDDEN);
 
+    prop = RNA_def_enum(ot->srna,
+                        "snap_elements",
+                        rna_enum_snap_element_items,
+                        SCE_SNAP_MODE_INCREMENT,
+                        "Snap to Elements",
+                        "");
+    RNA_def_property_flag(prop, PROP_ENUM_FLAG);
+
+    RNA_def_boolean(ot->srna, "use_snap_project", false, "Project Individual Elements", "");
+
     if (flags & P_GEO_SNAP) {
-      /* TODO(@gfxcoder): Rename `snap_target` to `snap_source` to avoid
-       * previous ambiguity of "target" (now, "source" is geometry to be moved and "target" is
-       * geometry to which moved geometry is snapped).  Use "Source snap point" and "Point on
-       * source that will snap to target" for name and description, respectively. */
-      prop = RNA_def_enum(ot->srna, "snap_target", rna_enum_snap_source_items, 0, "Target", "");
+      /* TODO(@gfxcoder): Rename `snap_target` to `snap_source` to avoid previous ambiguity of
+       * "target" (now, "source" is geometry to be moved and "target" is geometry to which moved
+       * geometry is snapped).  Use "Source snap point" and "Point on source that will snap to
+       * target" for name and description, respectively. */
+      prop = RNA_def_enum(ot->srna, "snap_target", rna_enum_snap_source_items, 0, "Snap With", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+
+      /* Target selection. */
+      prop = RNA_def_boolean(ot->srna, "use_snap_self", true, "Target: Include Active", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+      prop = RNA_def_boolean(ot->srna, "use_snap_edit", true, "Target: Include Edit", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+      prop = RNA_def_boolean(ot->srna, "use_snap_nonedit", true, "Target: Include Non-Edited", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+      prop = RNA_def_boolean(
+          ot->srna, "use_snap_selectable_only", false, "Target: Exclude Non-Selectable", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+
+      /* Face Nearest options */
+      prop = RNA_def_boolean(
+          ot->srna, "use_snap_to_same_target", false, "Snap to Same Target", "");
       RNA_def_property_flag(prop, PROP_HIDDEN);
+      prop = RNA_def_int(
+          ot->srna, "snap_face_nearest_steps", 1, 1, 32767, "Face Nearest Steps", "", 1, 32767);
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+
       prop = RNA_def_float_vector(
           ot->srna, "snap_point", 3, NULL, -FLT_MAX, FLT_MAX, "Point", "", -FLT_MAX, FLT_MAX);
       RNA_def_property_flag(prop, PROP_HIDDEN);
 
       if (flags & P_ALIGN_SNAP) {
-        prop = RNA_def_boolean(ot->srna, "snap_align", 0, "Align with Point Normal", "");
+        prop = RNA_def_boolean(ot->srna, "snap_align", false, "Align with Point Normal", "");
         RNA_def_property_flag(prop, PROP_HIDDEN);
         prop = RNA_def_float_vector(
             ot->srna, "snap_normal", 3, NULL, -FLT_MAX, FLT_MAX, "Normal", "", -FLT_MAX, FLT_MAX);
         RNA_def_property_flag(prop, PROP_HIDDEN);
       }
     }
+    else {
+      prop = RNA_def_boolean(
+          ot->srna, "use_snap_selectable_only", false, "Target: Exclude Non-Selectable", "");
+      RNA_def_property_flag(prop, PROP_HIDDEN);
+    }
   }
 
   if (flags & P_GPENCIL_EDIT) {
diff --git a/source/blender/editors/transform/transform_orientations.c b/source/blender/editors/transform/transform_orientations.c
index c0d943e17ee..212df5978e4 100644
--- a/source/blender/editors/transform/transform_orientations.c
+++ b/source/blender/editors/transform/transform_orientations.c
@@ -476,7 +476,8 @@ void ED_transform_calc_orientation_from_type(const bContext *C, float r_mat[3][3
   Object *obedit = CTX_data_edit_object(C);
   View3D *v3d = CTX_wm_view3d(C);
   RegionView3D *rv3d = region->regiondata;
-  Object *ob = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob = BKE_view_layer_active_object_get(view_layer);
   const short orient_index = BKE_scene_orientation_get_index(scene, SCE_ORIENT_DEFAULT);
   const int pivot_point = scene->toolsettings->transform_pivot_point;
 
@@ -515,7 +516,7 @@ short ED_transform_calc_orientation_from_type_ex(const Scene *scene,
     }
     case V3D_ORIENT_NORMAL: {
       if (obedit || (ob && ob->mode & OB_MODE_POSE)) {
-        ED_getTransformOrientationMatrix(view_layer, v3d, ob, obedit, pivot_point, r_mat);
+        ED_getTransformOrientationMatrix(scene, view_layer, v3d, ob, obedit, pivot_point, r_mat);
         break;
       }
       /* No break we define 'normal' as 'local' in Object mode. */
@@ -528,7 +529,7 @@ short ED_transform_calc_orientation_from_type_ex(const Scene *scene,
            * use the active pones axis for display T33575, this works as expected on a single
            * bone and users who select many bones will understand what's going on and what local
            * means when they start transforming. */
-          ED_getTransformOrientationMatrix(view_layer, v3d, ob, obedit, pivot_point, r_mat);
+          ED_getTransformOrientationMatrix(scene, view_layer, v3d, ob, obedit, pivot_point, r_mat);
         }
         else {
           transform_orientations_create_from_axis(r_mat, UNPACK3(ob->obmat));
@@ -744,7 +745,8 @@ static uint bm_mesh_faces_select_get_n(BMesh *bm, BMVert **elems, const uint n)
 }
 #endif
 
-int getTransformOrientation_ex(ViewLayer *view_layer,
+int getTransformOrientation_ex(const Scene *scene,
+                               ViewLayer *view_layer,
                                const View3D *v3d,
                                struct Object *ob,
                                struct Object *obedit,
@@ -1252,6 +1254,7 @@ int getTransformOrientation_ex(ViewLayer *view_layer,
         ok = true;
       }
       else {
+        BKE_view_layer_synced_ensure(scene, view_layer);
         Base *base = BKE_view_layer_base_find(view_layer, ob);
         if (UNLIKELY(base == NULL)) {
           /* This is very unlikely, if it happens allow the value to be set since the caller
@@ -1282,13 +1285,15 @@ int getTransformOrientation(const bContext *C, float normal[3], float plane[3])
   /* dummy value, not V3D_AROUND_ACTIVE and not V3D_AROUND_LOCAL_ORIGINS */
   short around = V3D_AROUND_CENTER_BOUNDS;
 
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
-  return getTransformOrientation_ex(view_layer, v3d, obact, obedit, normal, plane, around);
+  return getTransformOrientation_ex(scene, view_layer, v3d, obact, obedit, normal, plane, around);
 }
 
-void ED_getTransformOrientationMatrix(ViewLayer *view_layer,
+void ED_getTransformOrientationMatrix(const Scene *scene,
+                                      ViewLayer *view_layer,
                                       const View3D *v3d,
                                       Object *ob,
                                       Object *obedit,
@@ -1300,7 +1305,7 @@ void ED_getTransformOrientationMatrix(ViewLayer *view_layer,
 
   int type;
 
-  type = getTransformOrientation_ex(view_layer, v3d, ob, obedit, normal, plane, around);
+  type = getTransformOrientation_ex(scene, view_layer, v3d, ob, obedit, normal, plane, around);
 
   /* Fallback, when the plane can't be calculated. */
   if (ORIENTATION_USE_PLANE(type) && is_zero_v3(plane)) {
diff --git a/source/blender/editors/transform/transform_orientations.h b/source/blender/editors/transform/transform_orientations.h
index 3ac235517a7..32093e830b0 100644
--- a/source/blender/editors/transform/transform_orientations.h
+++ b/source/blender/editors/transform/transform_orientations.h
@@ -55,7 +55,8 @@ enum {
 };
 #define ORIENTATION_USE_PLANE(ty) ELEM(ty, ORIENTATION_NORMAL, ORIENTATION_EDGE, ORIENTATION_FACE)
 
-int getTransformOrientation_ex(ViewLayer *view_layer,
+int getTransformOrientation_ex(const Scene *scene,
+                               ViewLayer *view_layer,
                                const View3D *v3d,
                                struct Object *ob,
                                struct Object *obedit,
diff --git a/source/blender/editors/transform/transform_snap.c b/source/blender/editors/transform/transform_snap.c
index 22d062a71dc..31d36fc4d92 100644
--- a/source/blender/editors/transform/transform_snap.c
+++ b/source/blender/editors/transform/transform_snap.c
@@ -51,9 +51,6 @@
 
 static bool doForceIncrementSnap(const TransInfo *t);
 
-/* this should be passed as an arg for use in snap functions */
-#undef BASACT
-
 /* use half of flt-max so we can scale up without an exception */
 
 /* -------------------------------------------------------------------- */
@@ -128,15 +125,11 @@ bool activeSnap(const TransInfo *t)
 
 bool activeSnap_SnappingIndividual(const TransInfo *t)
 {
-  if (activeSnap(t) && t->tsnap.mode & SCE_SNAP_MODE_FACE_NEAREST) {
-    return true;
-  }
-
-  if (!t->tsnap.project) {
+  if (!activeSnap(t) || (t->flag & T_NO_PROJECT)) {
     return false;
   }
 
-  if (!activeSnap(t) || (t->flag & T_NO_PROJECT)) {
+  if (!(t->tsnap.project || (t->tsnap.mode & SCE_SNAP_MODE_FACE_NEAREST))) {
     return false;
   }
 
@@ -195,156 +188,152 @@ static bool doForceIncrementSnap(const TransInfo *t)
 void drawSnapping(const struct bContext *C, TransInfo *t)
 {
   uchar col[4], selectedCol[4], activeCol[4];
-
   if (!activeSnap(t)) {
     return;
   }
 
-  if (t->spacetype == SPACE_VIEW3D) {
-    bool draw_target = (t->tsnap.status & TARGET_INIT) &&
-                       (t->tsnap.mode & SCE_SNAP_MODE_EDGE_PERPENDICULAR);
-
-    if (draw_target || validSnap(t)) {
-      UI_GetThemeColor3ubv(TH_TRANSFORM, col);
-      col[3] = 128;
+  bool draw_target = (t->spacetype == SPACE_VIEW3D) && (t->tsnap.status & TARGET_INIT) &&
+                     (t->tsnap.mode & SCE_SNAP_MODE_EDGE_PERPENDICULAR);
 
-      UI_GetThemeColor3ubv(TH_SELECT, selectedCol);
-      selectedCol[3] = 128;
+  if (!(draw_target || validSnap(t))) {
+    return;
+  }
 
-      UI_GetThemeColor3ubv(TH_ACTIVE, activeCol);
-      activeCol[3] = 192;
+  if (t->spacetype == SPACE_SEQ) {
+    UI_GetThemeColor3ubv(TH_SEQ_ACTIVE, col);
+    col[3] = 128;
+  }
+  else if (t->spacetype != SPACE_IMAGE) {
+    UI_GetThemeColor3ubv(TH_TRANSFORM, col);
+    col[3] = 128;
 
-      const float *loc_cur = NULL;
-      const float *loc_prev = NULL;
-      const float *normal = NULL;
+    UI_GetThemeColor3ubv(TH_SELECT, selectedCol);
+    selectedCol[3] = 128;
 
-      GPU_depth_test(GPU_DEPTH_NONE);
+    UI_GetThemeColor3ubv(TH_ACTIVE, activeCol);
+    activeCol[3] = 192;
+  }
 
-      RegionView3D *rv3d = CTX_wm_region_view3d(C);
-      if (!BLI_listbase_is_empty(&t->tsnap.points)) {
-        /* Draw snap points. */
+  if (t->spacetype == SPACE_VIEW3D) {
+    const float *loc_cur = NULL;
+    const float *loc_prev = NULL;
+    const float *normal = NULL;
 
-        float size = 2.0f * UI_GetThemeValuef(TH_VERTEX_SIZE);
-        float view_inv[4][4];
-        copy_m4_m4(view_inv, rv3d->viewinv);
+    GPU_depth_test(GPU_DEPTH_NONE);
 
-        uint pos = GPU_vertformat_attr_add(
-            immVertexFormat(), "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+    RegionView3D *rv3d = CTX_wm_region_view3d(C);
+    if (!BLI_listbase_is_empty(&t->tsnap.points)) {
+      /* Draw snap points. */
 
-        immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
+      float size = 2.0f * UI_GetThemeValuef(TH_VERTEX_SIZE);
+      float view_inv[4][4];
+      copy_m4_m4(view_inv, rv3d->viewinv);
 
-        LISTBASE_FOREACH (TransSnapPoint *, p, &t->tsnap.points) {
-          if (p == t->tsnap.selectedPoint) {
-            immUniformColor4ubv(selectedCol);
-          }
-          else {
-            immUniformColor4ubv(col);
-          }
-          imm_drawcircball(p->co, ED_view3d_pixel_size(rv3d, p->co) * size, view_inv, pos);
-        }
+      uint pos = GPU_vertformat_attr_add(
+          immVertexFormat(), "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
 
-        immUnbindProgram();
-      }
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
-      /* draw normal if needed */
-      if (usingSnappingNormal(t) && validSnappingNormal(t)) {
-        normal = t->tsnap.snapNormal;
+      LISTBASE_FOREACH (TransSnapPoint *, p, &t->tsnap.points) {
+        if (p == t->tsnap.selectedPoint) {
+          immUniformColor4ubv(selectedCol);
+        }
+        else {
+          immUniformColor4ubv(col);
+        }
+        imm_drawcircball(p->co, ED_view3d_pixel_size(rv3d, p->co) * size, view_inv, pos);
       }
 
-      if (draw_target) {
-        loc_prev = t->tsnap.snapTarget;
-      }
+      immUnbindProgram();
+    }
 
-      if (validSnap(t)) {
-        loc_cur = t->tsnap.snapPoint;
-      }
+    /* draw normal if needed */
+    if (usingSnappingNormal(t) && validSnappingNormal(t)) {
+      normal = t->tsnap.snapNormal;
+    }
 
-      ED_view3d_cursor_snap_draw_util(
-          rv3d, loc_prev, loc_cur, normal, col, activeCol, t->tsnap.snapElem);
+    if (draw_target) {
+      loc_prev = t->tsnap.snapTarget;
+    }
 
-      GPU_depth_test(GPU_DEPTH_LESS_EQUAL);
+    if (validSnap(t)) {
+      loc_cur = t->tsnap.snapPoint;
     }
+
+    ED_view3d_cursor_snap_draw_util(
+        rv3d, loc_prev, loc_cur, normal, col, activeCol, t->tsnap.snapElem);
+
+    GPU_depth_test(GPU_DEPTH_LESS_EQUAL);
   }
   else if (t->spacetype == SPACE_IMAGE) {
-    if (validSnap(t)) {
-      uint pos = GPU_vertformat_attr_add(
-          immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-
-      float x, y;
-      const float snap_point[2] = {
-          t->tsnap.snapPoint[0] / t->aspect[0],
-          t->tsnap.snapPoint[1] / t->aspect[1],
-      };
-      UI_view2d_view_to_region_fl(&t->region->v2d, UNPACK2(snap_point), &x, &y);
-      float radius = 2.5f * UI_GetThemeValuef(TH_VERTEX_SIZE) * U.pixelsize;
-
-      GPU_matrix_push_projection();
-      wmOrtho2_region_pixelspace(t->region);
-
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
-      immUniformColor3ub(255, 255, 255);
-      imm_draw_circle_wire_2d(pos, x, y, radius, 8);
-      immUnbindProgram();
+    uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-      GPU_matrix_pop_projection();
-    }
-  }
-  else if (t->spacetype == SPACE_NODE) {
-    if (validSnap(t)) {
-      ARegion *region = CTX_wm_region(C);
-      TransSnapPoint *p;
-      float size;
+    float x, y;
+    const float snap_point[2] = {
+        t->tsnap.snapPoint[0] / t->aspect[0],
+        t->tsnap.snapPoint[1] / t->aspect[1],
+    };
+    UI_view2d_view_to_region_fl(&t->region->v2d, UNPACK2(snap_point), &x, &y);
+    float radius = 2.5f * UI_GetThemeValuef(TH_VERTEX_SIZE) * U.pixelsize;
 
-      size = 2.5f * UI_GetThemeValuef(TH_VERTEX_SIZE);
+    GPU_matrix_push_projection();
+    wmOrtho2_region_pixelspace(t->region);
 
-      GPU_blend(GPU_BLEND_ALPHA);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
+    immUniformColor3ub(255, 255, 255);
+    imm_draw_circle_wire_2d(pos, x, y, radius, 8);
+    immUnbindProgram();
 
-      uint pos = GPU_vertformat_attr_add(
-          immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+    GPU_matrix_pop_projection();
+  }
+  else if (t->spacetype == SPACE_NODE) {
+    ARegion *region = CTX_wm_region(C);
+    TransSnapPoint *p;
+    float size;
 
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    size = 2.5f * UI_GetThemeValuef(TH_VERTEX_SIZE);
 
-      for (p = t->tsnap.points.first; p; p = p->next) {
-        if (p == t->tsnap.selectedPoint) {
-          immUniformColor4ubv(selectedCol);
-        }
-        else {
-          immUniformColor4ubv(col);
-        }
+    GPU_blend(GPU_BLEND_ALPHA);
 
-        ED_node_draw_snap(&region->v2d, p->co, size, 0, pos);
-      }
+    uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-      if (t->tsnap.status & POINT_INIT) {
-        immUniformColor4ubv(activeCol);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
-        ED_node_draw_snap(&region->v2d, t->tsnap.snapPoint, size, t->tsnap.snapNodeBorder, pos);
+    for (p = t->tsnap.points.first; p; p = p->next) {
+      if (p == t->tsnap.selectedPoint) {
+        immUniformColor4ubv(selectedCol);
+      }
+      else {
+        immUniformColor4ubv(col);
       }
 
-      immUnbindProgram();
+      ED_node_draw_snap(&region->v2d, p->co, size, 0, pos);
+    }
 
-      GPU_blend(GPU_BLEND_NONE);
+    if (t->tsnap.status & POINT_INIT) {
+      immUniformColor4ubv(activeCol);
+
+      ED_node_draw_snap(&region->v2d, t->tsnap.snapPoint, size, t->tsnap.snapNodeBorder, pos);
     }
+
+    immUnbindProgram();
+
+    GPU_blend(GPU_BLEND_NONE);
   }
   else if (t->spacetype == SPACE_SEQ) {
-    if (validSnap(t)) {
-      const ARegion *region = CTX_wm_region(C);
-      GPU_blend(GPU_BLEND_ALPHA);
-      uint pos = GPU_vertformat_attr_add(
-          immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
-      UI_GetThemeColor3ubv(TH_SEQ_ACTIVE, col);
-      col[3] = 128;
-      immUniformColor4ubv(col);
-      float pixelx = BLI_rctf_size_x(&region->v2d.cur) / BLI_rcti_size_x(&region->v2d.mask);
-      immRectf(pos,
-               t->tsnap.snapPoint[0] - pixelx,
-               region->v2d.cur.ymax,
-               t->tsnap.snapPoint[0] + pixelx,
-               region->v2d.cur.ymin);
-      immUnbindProgram();
-      GPU_blend(GPU_BLEND_NONE);
-    }
+    const ARegion *region = CTX_wm_region(C);
+    GPU_blend(GPU_BLEND_ALPHA);
+    uint pos = GPU_vertformat_attr_add(immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
+    immUniformColor4ubv(col);
+    float pixelx = BLI_rctf_size_x(&region->v2d.cur) / BLI_rcti_size_x(&region->v2d.mask);
+    immRectf(pos,
+             t->tsnap.snapPoint[0] - pixelx,
+             region->v2d.cur.ymax,
+             t->tsnap.snapPoint[0] + pixelx,
+             region->v2d.cur.ymin);
+    immUnbindProgram();
+    GPU_blend(GPU_BLEND_NONE);
   }
 }
 
@@ -729,8 +718,8 @@ static eSnapMode snap_mode_from_spacetype(TransInfo *t)
 
 static eSnapTargetSelect snap_target_select_from_spacetype(TransInfo *t)
 {
-  ViewLayer *view_layer = t->view_layer;
-  Base *base_act = view_layer->basact;
+  BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+  Base *base_act = BKE_view_layer_active_base_get(t->view_layer);
 
   eSnapTargetSelect ret = SCE_SNAP_TARGET_ALL;
 
@@ -813,7 +802,7 @@ static void initSnappingMode(TransInfo *t)
       t->tsnap.use_backface_culling = snap_use_backface_culling(t);
       t->tsnap.object_context = ED_transform_snap_object_context_create(t->scene, 0);
 
-      if (t->data_type == TC_MESH_VERTS) {
+      if (t->data_type == &TransConvertType_Mesh) {
         /* Ignore elements being transformed. */
         ED_transform_snap_object_context_set_editmesh_callbacks(
             t->tsnap.object_context,
@@ -967,7 +956,8 @@ static void setSnappingCallback(TransInfo *t)
   }
   else if (t->spacetype == SPACE_IMAGE) {
     SpaceImage *sima = t->area->spacedata.first;
-    Object *obact = t->view_layer->basact ? t->view_layer->basact->object : NULL;
+    BKE_view_layer_synced_ensure(t->scene, t->view_layer);
+    Object *obact = BKE_view_layer_active_object_get(t->view_layer);
 
     const bool is_uv_editor = sima->mode == SI_MODE_UV;
     const bool has_edit_object = obact && BKE_object_is_in_editmode(obact);
@@ -1152,7 +1142,7 @@ static void snap_calc_uv_fn(TransInfo *t, float *UNUSED(vec))
   if (t->tsnap.mode & SCE_SNAP_MODE_VERTEX) {
     uint objects_len = 0;
     Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-        t->view_layer, NULL, &objects_len);
+        t->scene, t->view_layer, NULL, &objects_len);
 
     float dist_sq = square_f((float)SNAP_MIN_DISTANCE);
     if (ED_uvedit_nearest_uv_multi(&t->region->v2d,
@@ -1252,7 +1242,7 @@ static void snap_target_grid_ensure(TransInfo *t)
 {
   /* Only need to calculate once. */
   if ((t->tsnap.status & TARGET_GRID_INIT) == 0) {
-    if (t->data_type == TC_CURSOR_VIEW3D) {
+    if (t->data_type == &TransConvertType_Cursor3D) {
       /* Use a fallback when transforming the cursor.
        * In this case the center is _not_ derived from the cursor which is being transformed. */
       copy_v3_v3(t->tsnap.snapTargetGrid, TRANS_DATA_CONTAINER_FIRST_SINGLE(t)->data->iloc);
diff --git a/source/blender/editors/transform/transform_snap_object.cc b/source/blender/editors/transform/transform_snap_object.cc
index 479214ee2d3..6d643ae7180 100644
--- a/source/blender/editors/transform/transform_snap_object.cc
+++ b/source/blender/editors/transform/transform_snap_object.cc
@@ -47,6 +47,7 @@
 using blender::float3;
 using blender::float4x4;
 using blender::Map;
+using blender::Span;
 
 /* -------------------------------------------------------------------- */
 /** \name Internal Data Types
@@ -243,6 +244,11 @@ static SnapData_Mesh *snap_object_data_mesh_get(SnapObjectContext *sctx,
   SnapData_Mesh *sod;
   bool init = false;
 
+  const Span<MVert> verts = me_eval->verts();
+  const Span<MEdge> edges = me_eval->edges();
+  const Span<MPoly> polys = me_eval->polys();
+  const Span<MLoop> loops = me_eval->loops();
+
   if (std::unique_ptr<SnapData_Mesh> *sod_p = sctx->mesh_caches.lookup_ptr(ob_eval)) {
     sod = sod_p->get();
     bool is_dirty = false;
@@ -264,16 +270,16 @@ static SnapData_Mesh *snap_object_data_mesh_get(SnapObjectContext *sctx,
     else if (sod->treedata_mesh.looptri != me_eval->runtime.looptris.array) {
       is_dirty = true;
     }
-    else if (sod->treedata_mesh.vert != me_eval->mvert) {
+    else if (sod->treedata_mesh.vert != verts.data()) {
       is_dirty = true;
     }
-    else if (sod->treedata_mesh.loop != me_eval->mloop) {
+    else if (sod->treedata_mesh.loop != loops.data()) {
       is_dirty = true;
     }
-    else if (sod->treedata_mesh.edge != me_eval->medge) {
+    else if (sod->treedata_mesh.edge != edges.data()) {
       is_dirty = true;
     }
-    else if (sod->poly != me_eval->mpoly) {
+    else if (sod->poly != polys.data()) {
       is_dirty = true;
     }
 
@@ -303,16 +309,16 @@ static SnapData_Mesh *snap_object_data_mesh_get(SnapObjectContext *sctx,
                               use_hide ? BVHTREE_FROM_LOOPTRI_NO_HIDDEN : BVHTREE_FROM_LOOPTRI,
                               4);
 
-    BLI_assert(sod->treedata_mesh.vert == me_eval->mvert);
-    BLI_assert(!me_eval->mvert || sod->treedata_mesh.vert_normals);
-    BLI_assert(sod->treedata_mesh.loop == me_eval->mloop);
-    BLI_assert(!me_eval->mpoly || sod->treedata_mesh.looptri);
+    BLI_assert(sod->treedata_mesh.vert == verts.data());
+    BLI_assert(!verts.data() || sod->treedata_mesh.vert_normals);
+    BLI_assert(sod->treedata_mesh.loop == loops.data());
+    BLI_assert(!polys.data() || sod->treedata_mesh.looptri);
 
     sod->has_looptris = sod->treedata_mesh.tree != nullptr;
 
     /* Required for snapping with occlusion. */
-    sod->treedata_mesh.edge = me_eval->medge;
-    sod->poly = me_eval->mpoly;
+    sod->treedata_mesh.edge = edges.data();
+    sod->poly = polys.data();
 
     /* Start assuming that it has each of these element types. */
     sod->has_loose_edge = true;
@@ -498,7 +504,8 @@ static bool snap_object_is_snappable(const SnapObjectContext *sctx,
   const bool is_edited = (base->object->mode == OB_MODE_EDIT);
   const bool is_selectable = (base->flag & BASE_SELECTABLE);
   /* Get attributes of state. */
-  const bool is_in_object_mode = (base_act == NULL) || (base_act->object->mode == OB_MODE_OBJECT);
+  const bool is_in_object_mode = (base_act == nullptr) ||
+                                 (base_act->object->mode == OB_MODE_OBJECT);
 
   if (is_in_object_mode) {
     /* Handle target selection options that make sense for object mode. */
@@ -536,11 +543,13 @@ static void iter_snap_objects(SnapObjectContext *sctx,
                               IterSnapObjsCallback sob_callback,
                               void *data)
 {
+  Scene *scene = DEG_get_input_scene(sctx->runtime.depsgraph);
   ViewLayer *view_layer = DEG_get_input_view_layer(sctx->runtime.depsgraph);
   const eSnapTargetSelect snap_target_select = params->snap_target_select;
-  Base *base_act = view_layer->basact;
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *base_act = BKE_view_layer_active_base_get(view_layer);
 
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
     if (!snap_object_is_snappable(sctx, snap_target_select, base_act, base)) {
       continue;
     }
@@ -563,7 +572,7 @@ static void iter_snap_objects(SnapObjectContext *sctx,
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Ray Cast Funcs
+/** \name Ray Cast Functions
  * \{ */
 
 /* Store all ray-hits
@@ -1186,7 +1195,7 @@ static bool raycastObjects(SnapObjectContext *sctx,
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Surface Snap Funcs
+/** \name Surface Snap Functions
  * \{ */
 
 struct NearestWorldObjUserData {
@@ -3401,8 +3410,8 @@ static eSnapMode transform_snap_context_project_view3d_mixed_impl(SnapObjectCont
 
   bool use_occlusion_test = params->use_occlusion_test && !XRAY_ENABLED(v3d);
 
-  /* Note: if both face raycast and face nearest are enabled, first find result of nearest, then
-   * override with raycast. */
+  /* NOTE: if both face ray-cast and face nearest are enabled, first find result of nearest, then
+   * override with ray-cast. */
   if ((snap_to_flag & SCE_SNAP_MODE_FACE_NEAREST) && !has_hit) {
     has_hit = nearestWorldObjects(
         sctx, params, init_co, prev_co, loc, no, &index, &ob_eval, obmat);
diff --git a/source/blender/editors/transform/transform_snap_sequencer.c b/source/blender/editors/transform/transform_snap_sequencer.c
index 5ac526b1e91..06d9bb05206 100644
--- a/source/blender/editors/transform/transform_snap_sequencer.c
+++ b/source/blender/editors/transform/transform_snap_sequencer.c
@@ -28,6 +28,7 @@
 #include "SEQ_time.h"
 
 #include "transform.h"
+#include "transform_convert.h"
 #include "transform_snap.h"
 
 typedef struct TransSeqSnapData {
@@ -244,7 +245,7 @@ static int seq_snap_threshold_get_frame_distance(const TransInfo *t)
 
 TransSeqSnapData *transform_snap_sequencer_data_alloc(const TransInfo *t)
 {
-  if (t->data_type == TC_SEQ_IMAGE_DATA) {
+  if (t->data_type == &TransConvertType_SequencerImage) {
     return NULL;
   }
 
@@ -375,7 +376,7 @@ bool ED_transform_snap_sequencer_to_closest_strip_calc(Scene *scene,
   t.scene = scene;
   t.region = region;
   t.values[0] = 0;
-  t.data_type = TC_SEQ_DATA;
+  t.data_type = &TransConvertType_Sequencer;
 
   t.tsnap.mode = SEQ_tool_settings_snap_mode_get(scene);
   *r_snap_distance = transform_snap_sequencer_to_closest_strip_ex(&t, frame_1, frame_2);
diff --git a/source/blender/editors/undo/CMakeLists.txt b/source/blender/editors/undo/CMakeLists.txt
index 284b725cdf0..271d05e9c04 100644
--- a/source/blender/editors/undo/CMakeLists.txt
+++ b/source/blender/editors/undo/CMakeLists.txt
@@ -11,6 +11,7 @@ set(INC
   ../../windowmanager
   ../../../../intern/clog
   ../../../../intern/guardedalloc
+  ../../bmesh
 )
 
 set(SRC
diff --git a/source/blender/editors/undo/ed_undo.c b/source/blender/editors/undo/ed_undo.c
index ce14e6b180f..42563cb8f83 100644
--- a/source/blender/editors/undo/ed_undo.c
+++ b/source/blender/editors/undo/ed_undo.c
@@ -269,7 +269,7 @@ static int ed_undo_step_direction(bContext *C, enum eUndoStepDir step, ReportLis
 
   CLOG_INFO(&LOG, 1, "direction=%s", (step == STEP_UNDO) ? "STEP_UNDO" : "STEP_REDO");
 
-  /* TODO(campbell): undo_system: use undo system */
+  /* TODO(@campbellbarton): undo_system: use undo system */
   /* grease pencil can be can be used in plenty of spaces, so check it first */
   /* FIXME: This gpencil undo effectively only supports the one step undo/redo, undo based on name
    * or index is fully not implemented.
@@ -433,9 +433,11 @@ bool ED_undo_is_memfile_compatible(const bContext *C)
 {
   /* Some modes don't co-exist with memfile undo, disable their use: T60593
    * (this matches 2.7x behavior). */
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   if (view_layer != NULL) {
-    Object *obact = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obact = BKE_view_layer_active_object_get(view_layer);
     if (obact != NULL) {
       if (obact->mode & OB_MODE_EDIT) {
         return false;
@@ -447,9 +449,11 @@ bool ED_undo_is_memfile_compatible(const bContext *C)
 
 bool ED_undo_is_legacy_compatible_for_property(struct bContext *C, ID *id)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   if (view_layer != NULL) {
-    Object *obact = OBACT(view_layer);
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *obact = BKE_view_layer_active_object_get(view_layer);
     if (obact != NULL) {
       if (obact->mode & OB_MODE_ALL_PAINT) {
         /* Don't store property changes when painting
@@ -800,7 +804,8 @@ void ED_OT_undo_history(wmOperatorType *ot)
 void ED_undo_object_set_active_or_warn(
     Scene *scene, ViewLayer *view_layer, Object *ob, const char *info, CLG_LogRef *log)
 {
-  Object *ob_prev = OBACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Object *ob_prev = BKE_view_layer_active_object_get(view_layer);
   if (ob_prev != ob) {
     Base *base = BKE_view_layer_base_find(view_layer, ob);
     if (base != NULL) {
@@ -820,15 +825,15 @@ void ED_undo_object_editmode_restore_helper(struct bContext *C,
                                             uint object_array_stride)
 {
   Main *bmain = CTX_data_main(C);
+  Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint bases_len = 0;
   /* Don't request unique data because we want to de-select objects when exiting edit-mode
    * for that to be done on all objects we can't skip ones that share data. */
-  Base **bases = ED_undo_editmode_bases_from_view_layer(view_layer, &bases_len);
+  Base **bases = ED_undo_editmode_bases_from_view_layer(scene, view_layer, &bases_len);
   for (uint i = 0; i < bases_len; i++) {
     ((ID *)bases[i]->object->data)->tag |= LIB_TAG_DOIT;
   }
-  Scene *scene = CTX_data_scene(C);
   Object **ob_p = object_array;
   for (uint i = 0; i < object_array_len; i++, ob_p = POINTER_OFFSET(ob_p, object_array_stride)) {
     Object *obedit = *ob_p;
@@ -859,11 +864,14 @@ void ED_undo_object_editmode_restore_helper(struct bContext *C,
  * and local collections may be used.
  * \{ */
 
-static int undo_editmode_objects_from_view_layer_prepare(ViewLayer *view_layer, Object *obact)
+static int undo_editmode_objects_from_view_layer_prepare(const Scene *scene,
+                                                         ViewLayer *view_layer,
+                                                         Object *obact)
 {
   const short object_type = obact->type;
-
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  ListBase *object_bases = BKE_view_layer_object_bases_get(view_layer);
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     Object *ob = base->object;
     if ((ob->type == object_type) && (ob->mode & OB_MODE_EDIT)) {
       ID *id = ob->data;
@@ -872,7 +880,7 @@ static int undo_editmode_objects_from_view_layer_prepare(ViewLayer *view_layer,
   }
 
   int len = 0;
-  LISTBASE_FOREACH (Base *, base, &view_layer->object_bases) {
+  LISTBASE_FOREACH (Base *, base, object_bases) {
     Object *ob = base->object;
     if ((ob->type == object_type) && (ob->mode & OB_MODE_EDIT)) {
       ID *id = ob->data;
@@ -885,19 +893,23 @@ static int undo_editmode_objects_from_view_layer_prepare(ViewLayer *view_layer,
   return len;
 }
 
-Object **ED_undo_editmode_objects_from_view_layer(ViewLayer *view_layer, uint *r_len)
+Object **ED_undo_editmode_objects_from_view_layer(const Scene *scene,
+                                                  ViewLayer *view_layer,
+                                                  uint *r_len)
 {
-  Base *baseact = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *baseact = BKE_view_layer_active_base_get(view_layer);
   if ((baseact == NULL) || (baseact->object->mode & OB_MODE_EDIT) == 0) {
     return MEM_mallocN(0, __func__);
   }
-  const int len = undo_editmode_objects_from_view_layer_prepare(view_layer, baseact->object);
+  const int len = undo_editmode_objects_from_view_layer_prepare(
+      scene, view_layer, baseact->object);
   const short object_type = baseact->object->type;
   int i = 0;
   Object **objects = MEM_malloc_arrayN(len, sizeof(*objects), __func__);
   /* Base iteration, starting with the active-base to ensure it's the first item in the array.
    * Looping over the active-base twice is OK as the tag check prevents it being handled twice. */
-  for (Base *base = baseact, *base_next = FIRSTBASE(view_layer); base;
+  for (Base *base = baseact, *base_next = BKE_view_layer_object_bases_get(view_layer)->first; base;
        base = base_next, base_next = base_next ? base_next->next : NULL) {
     Object *ob = base->object;
     if ((ob->type == object_type) && (ob->mode & OB_MODE_EDIT)) {
@@ -914,19 +926,25 @@ Object **ED_undo_editmode_objects_from_view_layer(ViewLayer *view_layer, uint *r
   return objects;
 }
 
-Base **ED_undo_editmode_bases_from_view_layer(ViewLayer *view_layer, uint *r_len)
+Base **ED_undo_editmode_bases_from_view_layer(const Scene *scene,
+                                              ViewLayer *view_layer,
+                                              uint *r_len)
 {
-  Base *baseact = BASACT(view_layer);
+  BKE_view_layer_synced_ensure(scene, view_layer);
+  Base *baseact = BKE_view_layer_active_base_get(view_layer);
   if ((baseact == NULL) || (baseact->object->mode & OB_MODE_EDIT) == 0) {
     return MEM_mallocN(0, __func__);
   }
-  const int len = undo_editmode_objects_from_view_layer_prepare(view_layer, baseact->object);
+  const int len = undo_editmode_objects_from_view_layer_prepare(
+      scene, view_layer, baseact->object);
   const short object_type = baseact->object->type;
   int i = 0;
   Base **base_array = MEM_malloc_arrayN(len, sizeof(*base_array), __func__);
   /* Base iteration, starting with the active-base to ensure it's the first item in the array.
    * Looping over the active-base twice is OK as the tag check prevents it being handled twice. */
-  for (Base *base = BASACT(view_layer), *base_next = FIRSTBASE(view_layer); base;
+  for (Base *base = BKE_view_layer_active_base_get(view_layer),
+            *base_next = BKE_view_layer_object_bases_get(view_layer)->first;
+       base;
        base = base_next, base_next = base_next ? base_next->next : NULL) {
     Object *ob = base->object;
     if ((ob->type == object_type) && (ob->mode & OB_MODE_EDIT)) {
diff --git a/source/blender/editors/util/CMakeLists.txt b/source/blender/editors/util/CMakeLists.txt
index cdfe40c7d35..a9e6adc6e60 100644
--- a/source/blender/editors/util/CMakeLists.txt
+++ b/source/blender/editors/util/CMakeLists.txt
@@ -16,7 +16,6 @@ set(INC
   ../../sequencer
   ../../windowmanager
   ../../../../intern/clog
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -83,7 +82,6 @@ set(SRC
   ../include/ED_transform.h
   ../include/ED_transform_snap_object_context.h
   ../include/ED_transverts.h
-  ../include/ED_types.h
   ../include/ED_undo.h
   ../include/ED_userpref.h
   ../include/ED_util.h
diff --git a/source/blender/editors/util/ed_draw.c b/source/blender/editors/util/ed_draw.c
index 1b6a3efe19c..7ec3d3c1ef4 100644
--- a/source/blender/editors/util/ed_draw.c
+++ b/source/blender/editors/util/ed_draw.c
@@ -95,7 +95,7 @@ static void draw_overshoot_triangle(const uint8_t color[4],
 {
   const uint shdr_pos_2d = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-  immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_blend(GPU_BLEND_ALPHA);
   GPU_polygon_smooth(true);
   immUniformColor3ubvAlpha(color, 225);
@@ -370,11 +370,13 @@ tSlider *ED_slider_create(struct bContext *C)
   slider->factor = 0.5;
 
   /* Add draw callback. Always in header. */
-  LISTBASE_FOREACH (ARegion *, region, &slider->area->regionbase) {
-    if (region->regiontype == RGN_TYPE_HEADER) {
-      slider->region_header = region;
-      slider->draw_handle = ED_region_draw_cb_activate(
-          region->type, slider_draw, slider, REGION_DRAW_POST_PIXEL);
+  if (slider->area) {
+    LISTBASE_FOREACH (ARegion *, region, &slider->area->regionbase) {
+      if (region->regiontype == RGN_TYPE_HEADER) {
+        slider->region_header = region;
+        slider->draw_handle = ED_region_draw_cb_activate(
+            region->type, slider_draw, slider, REGION_DRAW_POST_PIXEL);
+      }
     }
   }
 
@@ -465,7 +467,9 @@ void ED_slider_status_string_get(const struct tSlider *slider,
 void ED_slider_destroy(struct bContext *C, tSlider *slider)
 {
   /* Remove draw callback. */
-  ED_region_draw_cb_exit(slider->region_header->type, slider->draw_handle);
+  if (slider->draw_handle) {
+    ED_region_draw_cb_exit(slider->region_header->type, slider->draw_handle);
+  }
   ED_area_status_text(slider->area, NULL);
   ED_workspace_status_text(C, NULL);
   MEM_freeN(slider);
@@ -512,7 +516,7 @@ void ED_region_draw_mouse_line_cb(const bContext *C, ARegion *region, void *arg_
 
   GPU_line_width(1.0f);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
@@ -778,7 +782,7 @@ void ED_region_image_metadata_draw(
     /* draw top box */
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColor(TH_METADATA_BG);
     immRectf(pos, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
     immUnbindProgram();
@@ -803,7 +807,7 @@ void ED_region_image_metadata_draw(
     /* draw top box */
     GPUVertFormat *format = immVertexFormat();
     uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
-    immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
     immUniformThemeColor(TH_METADATA_BG);
     immRectf(pos, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
     immUnbindProgram();
diff --git a/source/blender/editors/util/ed_util.c b/source/blender/editors/util/ed_util.c
index 3cfe6bd61a4..12e77c6ef00 100644
--- a/source/blender/editors/util/ed_util.c
+++ b/source/blender/editors/util/ed_util.c
@@ -54,22 +54,19 @@
 #include "WM_api.h"
 #include "WM_types.h"
 
-/* ********* general editor util funcs, not BKE stuff please! ********* */
+/* ********* general editor util functions, not BKE stuff please! ********* */
 
 void ED_editors_init_for_undo(Main *bmain)
 {
   wmWindowManager *wm = bmain->wm.first;
   LISTBASE_FOREACH (wmWindow *, win, &wm->windows) {
+    Scene *scene = WM_window_get_active_scene(win);
     ViewLayer *view_layer = WM_window_get_active_view_layer(win);
-    Base *base = BASACT(view_layer);
-    if (base != NULL) {
-      Object *ob = base->object;
-      if (ob->mode & OB_MODE_TEXTURE_PAINT) {
-        Scene *scene = WM_window_get_active_scene(win);
-
-        BKE_texpaint_slots_refresh_object(scene, ob);
-        ED_paint_proj_mesh_data_check(scene, ob, NULL, NULL, NULL, NULL);
-      }
+    BKE_view_layer_synced_ensure(scene, view_layer);
+    Object *ob = BKE_view_layer_active_object_get(view_layer);
+    if (ob && (ob->mode & OB_MODE_TEXTURE_PAINT)) {
+      BKE_texpaint_slots_refresh_object(scene, ob);
+      ED_paint_proj_mesh_data_check(scene, ob, NULL, NULL, NULL, NULL);
     }
   }
 }
@@ -176,7 +173,7 @@ void ED_editors_init(bContext *C)
       }
     }
     else {
-      /* TODO(campbell): avoid operator calls. */
+      /* TODO(@campbellbarton): avoid operator calls. */
       if (obact == ob) {
         ED_object_mode_set(C, mode);
       }
@@ -377,7 +374,7 @@ void unpack_menu(bContext *C,
     char local_name[FILE_MAXDIR + FILE_MAX], fi[FILE_MAX];
 
     BLI_split_file_part(abs_name, fi, sizeof(fi));
-    BLI_snprintf(local_name, sizeof(local_name), "//%s/%s", folder, fi);
+    BLI_path_join(local_name, sizeof(local_name), "//", folder, fi, NULL);
     if (!STREQ(abs_name, local_name)) {
       switch (BKE_packedfile_compare_to_file(blendfile_path, local_name, pf)) {
         case PF_CMP_NOFILE:
diff --git a/source/blender/editors/util/ed_util_imbuf.c b/source/blender/editors/util/ed_util_imbuf.c
index fc5fb9f9c28..f222f93d2b6 100644
--- a/source/blender/editors/util/ed_util_imbuf.c
+++ b/source/blender/editors/util/ed_util_imbuf.c
@@ -428,10 +428,10 @@ void ED_imbuf_sample_draw(const bContext *C, ARegion *region, void *arg_info)
       uint pos = GPU_vertformat_attr_add(format, "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
       const float color[3] = {1, 1, 1};
-      immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
+      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
       immUniformColor3fv(color);
 
-      /* TODO(campbell): lock to pixels. */
+      /* TODO(@campbellbarton): lock to pixels. */
       rctf sample_rect_fl;
       BLI_rctf_init_pt_radius(
           &sample_rect_fl,
diff --git a/source/blender/editors/util/numinput.c b/source/blender/editors/util/numinput.c
index be6ac6e13e6..60cbc2a2df6 100644
--- a/source/blender/editors/util/numinput.c
+++ b/source/blender/editors/util/numinput.c
@@ -311,6 +311,7 @@ static bool editstr_is_simple_numinput(const char ascii)
 bool handleNumInput(bContext *C, NumInput *n, const wmEvent *event)
 {
   const char *utf8_buf = NULL;
+  const char event_ascii = WM_event_utf8_to_ascii(event);
   char ascii[2] = {'\0', '\0'};
   bool updated = false;
   short idx = n->idx, idx_max = n->idx_max;
@@ -321,8 +322,8 @@ bool handleNumInput(bContext *C, NumInput *n, const wmEvent *event)
   if (U.flag & USER_FLAG_NUMINPUT_ADVANCED)
 #endif
   {
-    if (((event->modifier & (KM_CTRL | KM_ALT)) == 0) && (event->ascii != '\0') &&
-        strchr("01234567890@%^&*-+/{}()[]<>.|", event->ascii)) {
+    if (((event->modifier & (KM_CTRL | KM_ALT)) == 0) && (event_ascii != '\0') &&
+        strchr("01234567890@%^&*-+/{}()[]<>.|", event_ascii)) {
       if (!(n->flag & NUM_EDIT_FULL)) {
         n->flag |= NUM_EDITED;
         n->flag |= NUM_EDIT_FULL;
@@ -333,7 +334,7 @@ bool handleNumInput(bContext *C, NumInput *n, const wmEvent *event)
 
 #ifdef USE_FAKE_EDIT
   /* XXX Hack around keyboards without direct access to '=' nor '*'... */
-  if (ELEM(event->ascii, '=', '*')) {
+  if (ELEM(event_ascii, '=', '*')) {
     if (!(n->flag & NUM_EDIT_FULL)) {
       n->flag |= NUM_EDIT_FULL;
       n->val_flag[idx] |= NUM_EDITED;
@@ -357,7 +358,7 @@ bool handleNumInput(bContext *C, NumInput *n, const wmEvent *event)
       else {
         /* might be a char too... */
         utf8_buf = event->utf8_buf;
-        ascii[0] = event->ascii;
+        ascii[0] = event_ascii;
       }
       break;
     case EVT_BACKSPACEKEY:
@@ -523,9 +524,9 @@ bool handleNumInput(bContext *C, NumInput *n, const wmEvent *event)
       break;
   }
 
-  if (!updated && !utf8_buf && (event->utf8_buf[0] || event->ascii)) {
+  if (!updated && !utf8_buf && event->utf8_buf[0]) {
     utf8_buf = event->utf8_buf;
-    ascii[0] = event->ascii;
+    ascii[0] = event_ascii;
   }
 
   /* Up to this point, if we have a ctrl modifier, skip.
diff --git a/source/blender/editors/util/select_utils.c b/source/blender/editors/util/select_utils.c
index 660afa4c3d7..b29afdb5a9f 100644
--- a/source/blender/editors/util/select_utils.c
+++ b/source/blender/editors/util/select_utils.c
@@ -10,6 +10,8 @@
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
 
+#include "BLT_translation.h"
+
 #include "DNA_windowmanager_types.h"
 
 #include "RNA_access.h"
@@ -161,18 +163,18 @@ const char *ED_select_pick_get_name(wmOperatorType *UNUSED(ot), PointerRNA *ptr)
   ED_select_pick_params_from_operator(ptr, &params);
   switch (params.sel_op) {
     case SEL_OP_ADD:
-      return "Select (Extend)";
+      return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Select (Extend)");
     case SEL_OP_SUB:
-      return "Select (Deselect)";
+      return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Select (Deselect)");
     case SEL_OP_XOR:
-      return "Select (Toggle)";
+      return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Select (Toggle)");
     case SEL_OP_AND:
       BLI_assert_unreachable();
       ATTR_FALLTHROUGH;
     case SEL_OP_SET:
       break;
   }
-  return "Select";
+  return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Select");
 }
 
 const char *ED_select_circle_get_name(wmOperatorType *UNUSED(ot), PointerRNA *ptr)
@@ -181,9 +183,9 @@ const char *ED_select_circle_get_name(wmOperatorType *UNUSED(ot), PointerRNA *pt
   const eSelectOp sel_op = RNA_enum_get(ptr, "mode");
   switch (sel_op) {
     case SEL_OP_ADD:
-      return "Circle Select (Extend)";
+      return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Circle Select (Extend)");
     case SEL_OP_SUB:
-      return "Circle Select (Deselect)";
+      return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Circle Select (Deselect)");
     case SEL_OP_XOR:
       ATTR_FALLTHROUGH;
     case SEL_OP_AND:
@@ -192,7 +194,7 @@ const char *ED_select_circle_get_name(wmOperatorType *UNUSED(ot), PointerRNA *pt
     case SEL_OP_SET:
       break;
   }
-  return "Circle Select";
+  return CTX_N_(BLT_I18NCONTEXT_OPERATOR_DEFAULT, "Circle Select");
 }
 
 /** \} */
diff --git a/source/blender/editors/uvedit/CMakeLists.txt b/source/blender/editors/uvedit/CMakeLists.txt
index 761e7cd091e..4574c745d93 100644
--- a/source/blender/editors/uvedit/CMakeLists.txt
+++ b/source/blender/editors/uvedit/CMakeLists.txt
@@ -13,7 +13,6 @@ set(INC
   ../../makesrna
   ../../windowmanager
   ../../../../intern/eigen
-  ../../../../intern/glew-mx
   ../../../../intern/guardedalloc
   # RNA_prototypes.h
   ${CMAKE_BINARY_DIR}/source/blender/makesrna
@@ -23,7 +22,7 @@ set(INC
 set(SRC
   uvedit_buttons.c
   uvedit_draw.c
-  uvedit_islands.c
+  uvedit_islands.cc
   uvedit_ops.c
   uvedit_path.c
   uvedit_rip.c
diff --git a/source/blender/editors/uvedit/uvedit_buttons.c b/source/blender/editors/uvedit/uvedit_buttons.c
index 6192ae56d65..10368f7d43f 100644
--- a/source/blender/editors/uvedit/uvedit_buttons.c
+++ b/source/blender/editors/uvedit/uvedit_buttons.c
@@ -123,7 +123,7 @@ static void uvedit_vertex_buttons(const bContext *C, uiBlock *block)
   int imx, imy, step, digits;
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
+      scene, CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
 
   ED_space_image_get_size(sima, &imx, &imy);
 
@@ -211,7 +211,7 @@ static void do_uvedit_vertex(bContext *C, void *UNUSED(arg), int event)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
+      scene, CTX_data_view_layer(C), CTX_wm_view3d(C), &objects_len);
 
   ED_space_image_get_size(sima, &imx, &imy);
   uvedit_center(scene, objects, objects_len, center);
diff --git a/source/blender/editors/uvedit/uvedit_draw.c b/source/blender/editors/uvedit/uvedit_draw.c
index 141b59e0355..9deeb27b259 100644
--- a/source/blender/editors/uvedit/uvedit_draw.c
+++ b/source/blender/editors/uvedit/uvedit_draw.c
@@ -39,7 +39,7 @@ void ED_image_draw_cursor(ARegion *region, const float cursor[2])
   const uint shdr_pos = GPU_vertformat_attr_add(
       immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);
 
-  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);
+  immBindBuiltinProgram(GPU_SHADER_3D_LINE_DASHED_UNIFORM_COLOR);
 
   float viewport_size[4];
   GPU_viewport_size_get_f(viewport_size);
diff --git a/source/blender/editors/uvedit/uvedit_intern.h b/source/blender/editors/uvedit/uvedit_intern.h
index 04128cf378c..434bfbc64f9 100644
--- a/source/blender/editors/uvedit/uvedit_intern.h
+++ b/source/blender/editors/uvedit/uvedit_intern.h
@@ -14,9 +14,6 @@ struct Scene;
 struct SpaceImage;
 struct wmOperatorType;
 
-/* geometric utilities */
-void uv_poly_copy_aspect(float uv_orig[][2], float uv[][2], float aspx, float aspy, int len);
-
 /* find nearest */
 
 typedef struct UvNearestHit {
diff --git a/source/blender/editors/uvedit/uvedit_islands.c b/source/blender/editors/uvedit/uvedit_islands.cc
index e1752ae5a29..42415be656a 100644
--- a/source/blender/editors/uvedit/uvedit_islands.c
+++ b/source/blender/editors/uvedit/uvedit_islands.cc
@@ -46,7 +46,7 @@ static void bm_face_uv_scale_y(BMFace *f, const float scale_y, const int cd_loop
   BMLoop *l_first;
   l_iter = l_first = BM_FACE_FIRST_LOOP(f);
   do {
-    MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
+    MLoopUV *luv = static_cast<MLoopUV *>(BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset));
     luv->uv[1] *= scale_y;
   } while ((l_iter = l_iter->next) != l_first);
 }
@@ -61,7 +61,7 @@ static void bm_face_uv_translate_and_scale_around_pivot(BMFace *f,
   BMLoop *l_first;
   l_iter = l_first = BM_FACE_FIRST_LOOP(f);
   do {
-    MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
+    MLoopUV *luv = static_cast<MLoopUV *>(BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset));
     for (int i = 0; i < 2; i++) {
       luv->uv[i] = offset[i] + (((luv->uv[i] - pivot[i]) * scale[i]) + pivot[i]);
     }
@@ -76,9 +76,10 @@ static void bm_face_uv_translate_and_scale_around_pivot(BMFace *f,
 
 static void bm_face_array_calc_bounds(BMFace **faces,
                                       int faces_len,
-                                      const uint cd_loop_uv_offset,
+                                      const int cd_loop_uv_offset,
                                       rctf *r_bounds_rect)
 {
+  BLI_assert(cd_loop_uv_offset >= 0);
   float bounds_min[2], bounds_max[2];
   INIT_MINMAX2(bounds_min, bounds_max);
   for (int i = 0; i < faces_len; i++) {
@@ -96,8 +97,9 @@ static void bm_face_array_calc_bounds(BMFace **faces,
  * without duplicating coordinates for loops that share a vertex.
  */
 static float (*bm_face_array_calc_unique_uv_coords(
-    BMFace **faces, int faces_len, const uint cd_loop_uv_offset, int *r_coords_len))[2]
+    BMFace **faces, int faces_len, const int cd_loop_uv_offset, int *r_coords_len))[2]
 {
+  BLI_assert(cd_loop_uv_offset >= 0);
   int coords_len_alloc = 0;
   for (int i = 0; i < faces_len; i++) {
     BMFace *f = faces[i];
@@ -109,7 +111,8 @@ static float (*bm_face_array_calc_unique_uv_coords(
     coords_len_alloc += f->len;
   }
 
-  float(*coords)[2] = MEM_mallocN(sizeof(*coords) * coords_len_alloc, __func__);
+  float(*coords)[2] = static_cast<float(*)[2]>(
+      MEM_mallocN(sizeof(*coords) * coords_len_alloc, __func__));
   int coords_len = 0;
 
   for (int i = 0; i < faces_len; i++) {
@@ -123,7 +126,8 @@ static float (*bm_face_array_calc_unique_uv_coords(
       }
 
       BM_elem_flag_disable(l_iter, BM_ELEM_TAG);
-      const MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
+      const MLoopUV *luv = static_cast<const MLoopUV *>(
+          BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset));
       copy_v2_v2(coords[coords_len++], luv->uv);
 
       /* Un tag all connected so we don't add them twice.
@@ -138,7 +142,8 @@ static float (*bm_face_array_calc_unique_uv_coords(
           do {
             if (l_radial->v == l_iter->v) {
               if (BM_elem_flag_test(l_radial, BM_ELEM_TAG)) {
-                const MLoopUV *luv_radial = BM_ELEM_CD_GET_VOID_P(l_radial, cd_loop_uv_offset);
+                const MLoopUV *luv_radial = static_cast<const MLoopUV *>(
+                    BM_ELEM_CD_GET_VOID_P(l_radial, cd_loop_uv_offset));
                 if (equals_v2v2(luv->uv, luv_radial->uv)) {
                   /* Don't add this UV when met in another face in `faces`. */
                   BM_elem_flag_disable(l_iter, BM_ELEM_TAG);
@@ -150,7 +155,6 @@ static float (*bm_face_array_calc_unique_uv_coords(
       } while ((e = BM_DISK_EDGE_NEXT(e, v_pivot)) != e_first);
     } while ((l_iter = l_iter->next) != l_first);
   }
-  coords = MEM_reallocN(coords, sizeof(*coords) * coords_len);
   *r_coords_len = coords_len;
   return coords;
 }
@@ -164,7 +168,7 @@ static float (*bm_face_array_calc_unique_uv_coords(
 static void bm_face_array_uv_rotate_fit_aabb(BMFace **faces,
                                              int faces_len,
                                              int align_to_axis,
-                                             const uint cd_loop_uv_offset)
+                                             const int cd_loop_uv_offset)
 {
   /* Calculate unique coordinates since calculating a convex hull can be an expensive operation. */
   int coords_len;
@@ -209,7 +213,7 @@ static void bm_face_array_uv_rotate_fit_aabb(BMFace **faces,
 static void bm_face_array_uv_scale_y(BMFace **faces,
                                      int faces_len,
                                      const float scale_y,
-                                     const uint cd_loop_uv_offset)
+                                     const int cd_loop_uv_offset)
 {
   for (int i = 0; i < faces_len; i++) {
     BMFace *f = faces[i];
@@ -256,16 +260,11 @@ bool uv_coords_isect_udim(const Image *image, const int udim_grid[2], const floa
  * Calculates distance to nearest UDIM image tile in UV space and its UDIM tile number.
  */
 static float uv_nearest_image_tile_distance(const Image *image,
-                                            float coords[2],
+                                            const float coords[2],
                                             float nearest_tile_co[2])
 {
-  int nearest_image_tile_index = BKE_image_find_nearest_tile(image, coords);
-  if (nearest_image_tile_index == -1) {
-    nearest_image_tile_index = 1001;
-  }
+  BKE_image_find_nearest_tile_with_offset(image, coords, nearest_tile_co);
 
-  nearest_tile_co[0] = (nearest_image_tile_index - 1001) % 10;
-  nearest_tile_co[1] = (nearest_image_tile_index - 1001) / 10;
   /* Add 0.5 to get tile center coordinates. */
   float nearest_tile_center_co[2] = {nearest_tile_co[0], nearest_tile_co[1]};
   add_v2_fl(nearest_tile_center_co, 0.5f);
@@ -313,31 +312,16 @@ static float uv_nearest_grid_tile_distance(const int udim_grid[2],
 
 /* -------------------------------------------------------------------- */
 /** \name Calculate UV Islands
- *
- * \note Currently this is a private API/type, it could be made public.
  * \{ */
 
-struct FaceIsland {
-  struct FaceIsland *next, *prev;
-  BMFace **faces;
-  int faces_len;
-  rctf bounds_rect;
-  /**
-   * \note While this is duplicate information,
-   * it allows islands from multiple meshes to be stored in the same list.
-   */
-  uint cd_loop_uv_offset;
-  float aspect_y;
-};
-
 struct SharedUVLoopData {
-  uint cd_loop_uv_offset;
+  int cd_loop_uv_offset;
   bool use_seams;
 };
 
 static bool bm_loop_uv_shared_edge_check(const BMLoop *l_a, const BMLoop *l_b, void *user_data)
 {
-  const struct SharedUVLoopData *data = user_data;
+  const struct SharedUVLoopData *data = static_cast<const struct SharedUVLoopData *>(user_data);
 
   if (data->use_seams) {
     if (BM_elem_flag_test(l_a->e, BM_ELEM_SEAM)) {
@@ -351,24 +335,21 @@ static bool bm_loop_uv_shared_edge_check(const BMLoop *l_a, const BMLoop *l_b, v
 /**
  * Calculate islands and add them to \a island_list returning the number of items added.
  */
-static int bm_mesh_calc_uv_islands(const Scene *scene,
-                                   BMesh *bm,
-                                   ListBase *island_list,
-                                   const bool only_selected_faces,
-                                   const bool only_selected_uvs,
-                                   const bool use_seams,
-                                   const float aspect_y,
-                                   const uint cd_loop_uv_offset)
+int bm_mesh_calc_uv_islands(const Scene *scene,
+                            BMesh *bm,
+                            ListBase *island_list,
+                            const bool only_selected_faces,
+                            const bool only_selected_uvs,
+                            const bool use_seams,
+                            const float aspect_y,
+                            const int cd_loop_uv_offset)
 {
+  BLI_assert(cd_loop_uv_offset >= 0);
   int island_added = 0;
   BM_mesh_elem_table_ensure(bm, BM_FACE);
 
-  struct SharedUVLoopData user_data = {
-      .cd_loop_uv_offset = cd_loop_uv_offset,
-      .use_seams = use_seams,
-  };
-
-  int *groups_array = MEM_mallocN(sizeof(*groups_array) * (size_t)bm->totface, __func__);
+  int *groups_array = static_cast<int *>(
+      MEM_mallocN(sizeof(*groups_array) * (size_t)bm->totface, __func__));
 
   int(*group_index)[2];
 
@@ -393,6 +374,10 @@ static int bm_mesh_calc_uv_islands(const Scene *scene,
     }
   }
 
+  struct SharedUVLoopData user_data = {0};
+  user_data.cd_loop_uv_offset = cd_loop_uv_offset;
+  user_data.use_seams = use_seams;
+
   const int group_len = BM_mesh_calc_face_groups(bm,
                                                  groups_array,
                                                  &group_index,
@@ -405,7 +390,7 @@ static int bm_mesh_calc_uv_islands(const Scene *scene,
   for (int i = 0; i < group_len; i++) {
     const int faces_start = group_index[i][0];
     const int faces_len = group_index[i][1];
-    BMFace **faces = MEM_mallocN(sizeof(*faces) * faces_len, __func__);
+    BMFace **faces = static_cast<BMFace **>(MEM_mallocN(sizeof(*faces) * faces_len, __func__));
 
     float bounds_min[2], bounds_max[2];
     INIT_MINMAX2(bounds_min, bounds_max);
@@ -414,7 +399,8 @@ static int bm_mesh_calc_uv_islands(const Scene *scene,
       faces[j] = BM_face_at_index(bm, groups_array[faces_start + j]);
     }
 
-    struct FaceIsland *island = MEM_callocN(sizeof(*island), __func__);
+    struct FaceIsland *island = static_cast<struct FaceIsland *>(
+        MEM_callocN(sizeof(*island), __func__));
     island->faces = faces;
     island->faces_len = faces_len;
     island->cd_loop_uv_offset = cd_loop_uv_offset;
@@ -483,9 +469,10 @@ void ED_uvedit_pack_islands_multi(const Scene *scene,
   float margin = scene->toolsettings->uvcalc_margin;
   double area = 0.0f;
 
-  struct FaceIsland **island_array = MEM_mallocN(sizeof(*island_array) * island_list_len,
-                                                 __func__);
-  BoxPack *boxarray = MEM_mallocN(sizeof(*boxarray) * island_list_len, __func__);
+  struct FaceIsland **island_array = static_cast<struct FaceIsland **>(
+      MEM_mallocN(sizeof(*island_array) * island_list_len, __func__));
+  BoxPack *boxarray = static_cast<BoxPack *>(
+      MEM_mallocN(sizeof(*boxarray) * island_list_len, __func__));
 
   int index;
   /* Coordinates of bounding box containing all selected UVs. */
@@ -637,7 +624,7 @@ void ED_uvedit_pack_islands_multi(const Scene *scene,
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
-    DEG_id_tag_update(obedit->data, ID_RECALC_GEOMETRY);
+    DEG_id_tag_update(static_cast<ID *>(obedit->data), ID_RECALC_GEOMETRY);
     WM_main_add_notifier(NC_GEOM | ND_DATA, obedit->data);
   }
 
diff --git a/source/blender/editors/uvedit/uvedit_ops.c b/source/blender/editors/uvedit/uvedit_ops.c
index 4844ff22b68..5e2d9097abd 100644
--- a/source/blender/editors/uvedit/uvedit_ops.c
+++ b/source/blender/editors/uvedit/uvedit_ops.c
@@ -189,15 +189,6 @@ void uvedit_live_unwrap_update(SpaceImage *sima, Scene *scene, Object *obedit)
 /** \name Geometric Utilities
  * \{ */
 
-void uv_poly_copy_aspect(float uv_orig[][2], float uv[][2], float aspx, float aspy, int len)
-{
-  int i;
-  for (i = 0; i < len; i++) {
-    uv[i][0] = uv_orig[i][0] * aspx;
-    uv[i][1] = uv_orig[i][1] * aspy;
-  }
-}
-
 bool ED_uvedit_minmax_multi(
     const Scene *scene, Object **objects_edit, uint objects_len, float r_min[2], float r_max[2])
 {
@@ -329,7 +320,7 @@ bool ED_uvedit_center_from_pivot_ex(SpaceImage *sima,
       if (r_has_select != NULL) {
         uint objects_len = 0;
         Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-            view_layer, ((View3D *)NULL), &objects_len);
+            scene, view_layer, ((View3D *)NULL), &objects_len);
         *r_has_select = uvedit_select_is_any_selected_multi(scene, objects, objects_len);
         MEM_freeN(objects);
       }
@@ -338,7 +329,7 @@ bool ED_uvedit_center_from_pivot_ex(SpaceImage *sima,
     default: {
       uint objects_len = 0;
       Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-          view_layer, ((View3D *)NULL), &objects_len);
+          scene, view_layer, ((View3D *)NULL), &objects_len);
       changed = ED_uvedit_center_multi(scene, objects, objects_len, r_center, mode);
       MEM_freeN(objects);
       if (r_has_select != NULL) {
@@ -544,20 +535,17 @@ static bool uvedit_uv_straighten(Scene *scene, BMesh *bm, eUVWeldAlign tool)
     return false;
   }
 
-  UvElementMap *element_map = BM_uv_element_map_create(bm, scene, false, true, false, true);
+  UvElementMap *element_map = BM_uv_element_map_create(bm, scene, true, false, true, true);
   if (element_map == NULL) {
     return false;
   }
 
   bool changed = false;
-
-  /* Loop backwards to simplify logic. */
-  int j1 = element_map->totalUVs;
-  for (int i = element_map->totalIslands - 1; i >= 0; --i) {
-    int j0 = element_map->islandIndices[i];
-    changed |= uvedit_uv_straighten_elements(
-        element_map->buf + j0, j1 - j0, cd_loop_uv_offset, tool);
-    j1 = j0;
+  for (int i = 0; i < element_map->total_islands; i++) {
+    changed |= uvedit_uv_straighten_elements(element_map->storage + element_map->island_indices[i],
+                                             element_map->island_total_uvs[i],
+                                             cd_loop_uv_offset,
+                                             tool);
   }
 
   BM_uv_element_map_free(element_map);
@@ -577,7 +565,7 @@ static void uv_weld_align(bContext *C, eUVWeldAlign tool)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   if (tool == UV_ALIGN_AUTO) {
     for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -707,7 +695,7 @@ static int uv_remove_doubles_to_selected(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   bool *changed = MEM_callocN(sizeof(bool) * objects_len, "uv_remove_doubles_selected.changed");
 
@@ -851,7 +839,7 @@ static int uv_remove_doubles_to_unselected(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   /* Calculate max possible number of kdtree nodes. */
   int uv_maxlen = 0;
@@ -1036,6 +1024,12 @@ static bool uv_snap_cursor_to_selection(Scene *scene,
   return ED_uvedit_center_multi(scene, objects_edit, objects_len, sima->cursor, sima->around);
 }
 
+static void uv_snap_cursor_to_origin(float uvco[2])
+{
+  uvco[0] = 0;
+  uvco[1] = 0;
+}
+
 static int uv_snap_cursor_exec(bContext *C, wmOperator *op)
 {
   SpaceImage *sima = CTX_wm_space_image(C);
@@ -1053,11 +1047,15 @@ static int uv_snap_cursor_exec(bContext *C, wmOperator *op)
 
       uint objects_len = 0;
       Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-          view_layer, ((View3D *)NULL), &objects_len);
+          scene, view_layer, ((View3D *)NULL), &objects_len);
       changed = uv_snap_cursor_to_selection(scene, objects, objects_len, sima);
       MEM_freeN(objects);
       break;
     }
+    case 2:
+      uv_snap_cursor_to_origin(sima->cursor);
+      changed = true;
+      break;
   }
 
   if (!changed) {
@@ -1074,6 +1072,7 @@ static void UV_OT_snap_cursor(wmOperatorType *ot)
   static const EnumPropertyItem target_items[] = {
       {0, "PIXELS", 0, "Pixels", ""},
       {1, "SELECTED", 0, "Selected", ""},
+      {2, "ORIGIN", 0, "Origin", ""},
       {0, NULL, 0, NULL, NULL},
   };
 
@@ -1256,7 +1255,7 @@ static int uv_snap_selection_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   if (target == 2) {
     float center[2];
@@ -1349,7 +1348,7 @@ static int uv_pin_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -1451,7 +1450,7 @@ static int uv_hide_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1498,7 +1497,7 @@ static int uv_hide_exec(bContext *C, wmOperator *op)
             if (bm_face_is_all_uv_sel(efa, !swap, cd_loop_uv_offset)) {
               BM_face_select_set(em->bm, efa, false);
             }
-            uvedit_face_select_disable(scene, em, efa, cd_loop_uv_offset);
+            uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
           }
           else {
             if (bm_face_is_all_uv_sel(efa, true, cd_loop_uv_offset) == !swap) {
@@ -1515,7 +1514,7 @@ static int uv_hide_exec(bContext *C, wmOperator *op)
               }
             }
             if (!swap) {
-              uvedit_face_select_disable(scene, em, efa, cd_loop_uv_offset);
+              uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
             }
           }
         }
@@ -1537,7 +1536,7 @@ static int uv_hide_exec(bContext *C, wmOperator *op)
               break;
             }
           }
-          uvedit_face_select_disable(scene, em, efa, cd_loop_uv_offset);
+          uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
         }
         else {
           BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
@@ -1561,7 +1560,7 @@ static int uv_hide_exec(bContext *C, wmOperator *op)
             }
           }
           if (!swap) {
-            uvedit_face_select_disable(scene, em, efa, cd_loop_uv_offset);
+            uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
           }
         }
       }
@@ -1623,7 +1622,7 @@ static int uv_reveal_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1839,7 +1838,7 @@ static int uv_seams_from_islands_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *ob = objects[ob_index];
@@ -1944,7 +1943,7 @@ static int uv_mark_seam_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   bool changed = false;
 
diff --git a/source/blender/editors/uvedit/uvedit_path.c b/source/blender/editors/uvedit/uvedit_path.c
index 7c6960a634a..7af6cbe942b 100644
--- a/source/blender/editors/uvedit/uvedit_path.c
+++ b/source/blender/editors/uvedit/uvedit_path.c
@@ -56,75 +56,6 @@
 #include "bmesh_tools.h"
 
 /* -------------------------------------------------------------------- */
-/** \name Local Utilities
- * \{ */
-
-/**
- * Support edge-path using vert-path calculation code.
- *
- * Cheat! Pick 2 closest loops and do vertex path,
- * in practices only obscure/contrived cases will make give noticeably worse behavior.
- *
- * While the code below is a bit awkward, it's significantly less overhead than
- * adding full edge selection which is nearly the same as vertex path in the case of UV's.
- *
- * \param use_nearest: When false use the post distant pair of loops,
- * use when filling a region as we want both verts from each edge to be included in the region.
- */
-static void bm_loop_calc_vert_pair_from_edge_pair(const bool use_nearest,
-                                                  const int cd_loop_uv_offset,
-                                                  const float aspect_y,
-                                                  BMElem **ele_src_p,
-                                                  BMElem **ele_dst_p,
-                                                  BMElem **r_ele_dst_final)
-{
-  BMLoop *l_src = (BMLoop *)*ele_src_p;
-  BMLoop *l_dst = (BMLoop *)*ele_dst_p;
-
-  const MLoopUV *luv_src_v1 = BM_ELEM_CD_GET_VOID_P(l_src, cd_loop_uv_offset);
-  const MLoopUV *luv_src_v2 = BM_ELEM_CD_GET_VOID_P(l_src->next, cd_loop_uv_offset);
-  const MLoopUV *luv_dst_v1 = BM_ELEM_CD_GET_VOID_P(l_dst, cd_loop_uv_offset);
-  const MLoopUV *luv_dst_v2 = BM_ELEM_CD_GET_VOID_P(l_dst->next, cd_loop_uv_offset);
-
-  const float uv_src_v1[2] = {luv_src_v1->uv[0], luv_src_v1->uv[1] / aspect_y};
-  const float uv_src_v2[2] = {luv_src_v2->uv[0], luv_src_v2->uv[1] / aspect_y};
-  const float uv_dst_v1[2] = {luv_dst_v1->uv[0], luv_dst_v1->uv[1] / aspect_y};
-  const float uv_dst_v2[2] = {luv_dst_v2->uv[0], luv_dst_v2->uv[1] / aspect_y};
-
-  struct {
-    int src_index;
-    int dst_index;
-    float len_sq;
-  } tests[4] = {
-      {0, 0, len_squared_v2v2(uv_src_v1, uv_dst_v1)},
-      {0, 1, len_squared_v2v2(uv_src_v1, uv_dst_v2)},
-      {1, 0, len_squared_v2v2(uv_src_v2, uv_dst_v1)},
-      {1, 1, len_squared_v2v2(uv_src_v2, uv_dst_v2)},
-  };
-  int i_best = 0;
-  for (int i = 1; i < ARRAY_SIZE(tests); i++) {
-    if (use_nearest) {
-      if (tests[i].len_sq < tests[i_best].len_sq) {
-        i_best = i;
-      }
-    }
-    else {
-      if (tests[i].len_sq > tests[i_best].len_sq) {
-        i_best = i;
-      }
-    }
-  }
-
-  *ele_src_p = (BMElem *)(tests[i_best].src_index ? l_src->next : l_src);
-  *ele_dst_p = (BMElem *)(tests[i_best].dst_index ? l_dst->next : l_dst);
-
-  /* Ensure the edge is selected, not just the vertices up until we hit it. */
-  *r_ele_dst_final = (BMElem *)(tests[i_best].dst_index ? l_dst : l_dst->next);
-}
-
-/** \} */
-
-/* -------------------------------------------------------------------- */
 /** \name Path Select Struct & Properties
  * \{ */
 
@@ -140,7 +71,7 @@ struct PathSelectParams {
 struct UserData_UV {
   Scene *scene;
   BMEditMesh *em;
-  uint cd_loop_uv_offset;
+  int cd_loop_uv_offset;
 };
 
 static void path_select_properties(wmOperatorType *ot)
@@ -180,22 +111,22 @@ static void path_select_params_from_op(wmOperator *op, struct PathSelectParams *
  * \{ */
 
 /* callbacks */
-static bool looptag_filter_cb(BMLoop *l, void *user_data_v)
+static bool verttag_filter_cb(BMLoop *l, void *user_data_v)
 {
   struct UserData_UV *user_data = user_data_v;
   return uvedit_face_visible_test(user_data->scene, l->f);
 }
-static bool looptag_test_cb(BMLoop *l, void *user_data_v)
+static bool verttag_test_cb(BMLoop *l, void *user_data_v)
 {
   /* All connected loops are selected or we return false. */
   struct UserData_UV *user_data = user_data_v;
   const Scene *scene = user_data->scene;
-  const uint cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
   const MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
   BMIter iter;
   BMLoop *l_iter;
   BM_ITER_ELEM (l_iter, &iter, l->v, BM_LOOPS_OF_VERT) {
-    if (looptag_filter_cb(l_iter, user_data)) {
+    if (verttag_filter_cb(l_iter, user_data)) {
       const MLoopUV *luv_iter = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
       if (equals_v2v2(luv->uv, luv_iter->uv)) {
         if (!uvedit_uv_select_test(scene, l_iter, cd_loop_uv_offset)) {
@@ -206,20 +137,20 @@ static bool looptag_test_cb(BMLoop *l, void *user_data_v)
   }
   return true;
 }
-static void looptag_set_cb(BMLoop *l, bool val, void *user_data_v)
+static void verttag_set_cb(BMLoop *l, bool val, void *user_data_v)
 {
   struct UserData_UV *user_data = user_data_v;
   const Scene *scene = user_data->scene;
   BMEditMesh *em = user_data->em;
-  const uint cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
   const MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
   BMIter iter;
   BMLoop *l_iter;
   BM_ITER_ELEM (l_iter, &iter, l->v, BM_LOOPS_OF_VERT) {
-    if (looptag_filter_cb(l_iter, user_data)) {
+    if (verttag_filter_cb(l_iter, user_data)) {
       MLoopUV *luv_iter = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_uv_offset);
       if (equals_v2v2(luv->uv, luv_iter->uv)) {
-        uvedit_uv_select_set(scene, em, l_iter, val, false, cd_loop_uv_offset);
+        uvedit_uv_select_set(scene, em->bm, l_iter, val, false, cd_loop_uv_offset);
       }
     }
   }
@@ -233,42 +164,10 @@ static int mouse_mesh_uv_shortest_path_vert(Scene *scene,
                                             const float aspect_y,
                                             const int cd_loop_uv_offset)
 {
-  const char uv_selectmode = ED_uvedit_select_mode_get(scene);
-  /* TODO(@sidd017): Implement logic to calculate shortest path for UV edges, since we now support
-   * proper edge selection for UVs (D12028).
-   * Till then continue using vertex path to fake shortest path calculation for edges. */
-  const bool use_fake_edge_select = (uv_selectmode & UV_SELECT_EDGE);
   BMEditMesh *em = BKE_editmesh_from_object(obedit);
   BMesh *bm = em->bm;
   int flush = 0;
 
-  /* Variables to use when `use_fake_edge_select` is set. */
-  struct {
-    BMLoop *l_dst_activate;
-    BMLoop *l_dst_add_to_path;
-  } fake_edge_select = {NULL};
-
-  if (use_fake_edge_select) {
-    fake_edge_select.l_dst_activate = l_dst;
-
-    /* Use most distant when doing region selection.
-     * without this we get dangling edges outside the region. */
-    bool use_neaerst = (op_params->use_fill == false);
-    BMElem *ele_src = (BMElem *)l_src;
-    BMElem *ele_dst = (BMElem *)l_dst;
-    BMElem *ele_dst_final = NULL;
-    bm_loop_calc_vert_pair_from_edge_pair(
-        use_neaerst, cd_loop_uv_offset, aspect_y, &ele_src, &ele_dst, &ele_dst_final);
-
-    if (op_params->use_fill == false) {
-      /* Always activate the item under the cursor. */
-      fake_edge_select.l_dst_add_to_path = (BMLoop *)ele_dst_final;
-    }
-
-    l_src = (BMLoop *)ele_src;
-    l_dst = (BMLoop *)ele_dst;
-  }
-
   struct UserData_UV user_data = {
       .scene = scene,
       .em = em,
@@ -291,33 +190,23 @@ static int mouse_mesh_uv_shortest_path_vert(Scene *scene,
                                               (BMElem *)l_src,
                                               (BMElem *)l_dst,
                                               params.cd_loop_uv_offset,
-                                              looptag_filter_cb,
+                                              verttag_filter_cb,
                                               &user_data);
     }
     else {
       is_path_ordered = true;
-      path = BM_mesh_calc_path_uv_vert(bm, l_src, l_dst, &params, looptag_filter_cb, &user_data);
+      path = BM_mesh_calc_path_uv_vert(bm, l_src, l_dst, &params, verttag_filter_cb, &user_data);
     }
   }
 
   BMLoop *l_dst_last = l_dst;
 
   if (path) {
-    if (use_fake_edge_select) {
-      if ((fake_edge_select.l_dst_add_to_path != NULL) &&
-          (BLI_linklist_index(path, fake_edge_select.l_dst_add_to_path) == -1)) {
-        /* Append, this isn't optimal compared to #BLI_linklist_append, it's a one-off lookup. */
-        LinkNode *path_last = BLI_linklist_find_last(path);
-        BLI_linklist_insert_after(&path_last, fake_edge_select.l_dst_add_to_path);
-        BLI_assert(BLI_linklist_find_last(path)->link == fake_edge_select.l_dst_add_to_path);
-      }
-    }
-
     /* toggle the flag */
     bool all_set = true;
     LinkNode *node = path;
     do {
-      if (!looptag_test_cb((BMLoop *)node->link, &user_data)) {
+      if (!verttag_test_cb((BMLoop *)node->link, &user_data)) {
         all_set = false;
         break;
       }
@@ -328,7 +217,7 @@ static int mouse_mesh_uv_shortest_path_vert(Scene *scene,
     do {
       if ((is_path_ordered == false) ||
           WM_operator_properties_checker_interval_test(&op_params->interval_params, depth)) {
-        looptag_set_cb((BMLoop *)node->link, !all_set, &user_data);
+        verttag_set_cb((BMLoop *)node->link, !all_set, &user_data);
         if (is_path_ordered) {
           l_dst_last = node->link;
         }
@@ -339,23 +228,133 @@ static int mouse_mesh_uv_shortest_path_vert(Scene *scene,
     flush = all_set ? -1 : 1;
   }
   else {
-    const bool is_act = !looptag_test_cb(l_dst, &user_data);
-    looptag_set_cb(l_dst, is_act, &user_data); /* switch the face option */
+    const bool is_act = !verttag_test_cb(l_dst, &user_data);
+    verttag_set_cb(l_dst, is_act, &user_data); /* switch the face option */
   }
 
   if (op_params->track_active) {
-    /* Fake edge selection. */
-    if (use_fake_edge_select) {
-      BMLoop *l_dst_activate = fake_edge_select.l_dst_activate;
-      /* TODO(campbell): Search for an active loop attached to 'l_dst'.
-       * when `BLI_linklist_index(path, l_dst_activate) == -1`
-       * In practice this rarely happens though. */
-      ED_uvedit_active_edge_loop_set(bm, l_dst_activate);
+    ED_uvedit_active_vert_loop_set(bm, l_dst_last);
+  }
+  return flush;
+}
+
+/* -------------------------------------------------------------------- */
+/** \name UV Edge Path
+ * \{ */
+
+/* callbacks */
+static bool edgetag_filter_cb(BMLoop *l, void *user_data_v)
+{
+  struct UserData_UV *user_data = user_data_v;
+  return uvedit_face_visible_test(user_data->scene, l->f);
+}
+static bool edgetag_test_cb(BMLoop *l, void *user_data_v)
+{
+  /* All connected loops (UV) are selected or we return false. */
+  struct UserData_UV *user_data = user_data_v;
+  const Scene *scene = user_data->scene;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  BMIter iter;
+  BMLoop *l_iter;
+  BM_ITER_ELEM (l_iter, &iter, l->e, BM_LOOPS_OF_EDGE) {
+    if (edgetag_filter_cb(l_iter, user_data)) {
+      if (BM_loop_uv_share_edge_check(l, l_iter, cd_loop_uv_offset)) {
+        if (!uvedit_edge_select_test(scene, l_iter, cd_loop_uv_offset)) {
+          return false;
+        }
+      }
+    }
+  }
+  return true;
+}
+static void edgetag_set_cb(BMLoop *l, bool val, void *user_data_v)
+{
+  struct UserData_UV *user_data = user_data_v;
+  const Scene *scene = user_data->scene;
+  BMEditMesh *em = user_data->em;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  uvedit_edge_select_set_with_sticky(scene, em, l, val, false, cd_loop_uv_offset);
+}
+
+static int mouse_mesh_uv_shortest_path_edge(Scene *scene,
+                                            Object *obedit,
+                                            const struct PathSelectParams *op_params,
+                                            BMLoop *l_src,
+                                            BMLoop *l_dst,
+                                            const float aspect_y,
+                                            const int cd_loop_uv_offset)
+{
+  BMEditMesh *em = BKE_editmesh_from_object(obedit);
+  BMesh *bm = em->bm;
+  int flush = 0;
+
+  struct UserData_UV user_data = {
+      .scene = scene,
+      .em = em,
+      .cd_loop_uv_offset = cd_loop_uv_offset,
+  };
+
+  const struct BMCalcPathUVParams params = {
+      .use_topology_distance = op_params->use_topology_distance,
+      .use_step_face = op_params->use_face_step,
+      .aspect_y = aspect_y,
+      .cd_loop_uv_offset = cd_loop_uv_offset,
+  };
+
+  LinkNode *path = NULL;
+  bool is_path_ordered = false;
+
+  if (l_src != l_dst) {
+    if (op_params->use_fill) {
+      path = BM_mesh_calc_path_uv_region_edge(bm,
+                                              (BMElem *)l_src,
+                                              (BMElem *)l_dst,
+                                              params.cd_loop_uv_offset,
+                                              edgetag_filter_cb,
+                                              &user_data);
     }
     else {
-      ED_uvedit_active_vert_loop_set(bm, l_dst_last);
+      is_path_ordered = true;
+      path = BM_mesh_calc_path_uv_edge(bm, l_src, l_dst, &params, edgetag_filter_cb, &user_data);
     }
   }
+
+  BMLoop *l_dst_last = l_dst;
+
+  if (path) {
+    /* toggle the flag */
+    bool all_set = true;
+    LinkNode *node = path;
+    do {
+      if (!edgetag_test_cb((BMLoop *)node->link, &user_data)) {
+        all_set = false;
+        break;
+      }
+    } while ((node = node->next));
+
+    int depth = -1;
+    node = path;
+    do {
+      if ((is_path_ordered == false) ||
+          WM_operator_properties_checker_interval_test(&op_params->interval_params, depth)) {
+        edgetag_set_cb((BMLoop *)node->link, !all_set, &user_data);
+        if (is_path_ordered) {
+          l_dst_last = node->link;
+        }
+      }
+    } while ((void)depth++, (node = node->next));
+
+    BLI_linklist_free(path, NULL);
+    flush = all_set ? -1 : 1;
+  }
+  else {
+    const bool is_act = !edgetag_test_cb(l_dst, &user_data);
+    edgetag_set_cb(l_dst, is_act, &user_data); /* switch the face option */
+  }
+
+  if (op_params->track_active) {
+    ED_uvedit_active_edge_loop_set(bm, l_dst_last);
+  }
   return flush;
 }
 
@@ -376,7 +375,7 @@ static bool facetag_test_cb(BMFace *f, void *user_data_v)
   /* All connected loops are selected or we return false. */
   struct UserData_UV *user_data = user_data_v;
   const Scene *scene = user_data->scene;
-  const uint cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
   BMIter iter;
   BMLoop *l_iter;
   BM_ITER_ELEM (l_iter, &iter, f, BM_LOOPS_OF_FACE) {
@@ -391,7 +390,7 @@ static void facetag_set_cb(BMFace *f, bool val, void *user_data_v)
   struct UserData_UV *user_data = user_data_v;
   const Scene *scene = user_data->scene;
   BMEditMesh *em = user_data->em;
-  const uint cd_loop_uv_offset = user_data->cd_loop_uv_offset;
+  const int cd_loop_uv_offset = user_data->cd_loop_uv_offset;
   uvedit_face_select_set_with_sticky(scene, em, f, val, false, cd_loop_uv_offset);
 }
 
@@ -514,13 +513,24 @@ static bool uv_shortest_path_pick_ex(Scene *scene,
     ok = true;
   }
   else if (ele_src->head.htype == BM_LOOP) {
-    flush = mouse_mesh_uv_shortest_path_vert(scene,
-                                             obedit,
-                                             op_params,
-                                             (BMLoop *)ele_src,
-                                             (BMLoop *)ele_dst,
-                                             aspect_y,
-                                             cd_loop_uv_offset);
+    if (uv_selectmode & UV_SELECT_EDGE) {
+      flush = mouse_mesh_uv_shortest_path_edge(scene,
+                                               obedit,
+                                               op_params,
+                                               (BMLoop *)ele_src,
+                                               (BMLoop *)ele_dst,
+                                               aspect_y,
+                                               cd_loop_uv_offset);
+    }
+    else {
+      flush = mouse_mesh_uv_shortest_path_vert(scene,
+                                               obedit,
+                                               op_params,
+                                               (BMLoop *)ele_src,
+                                               (BMLoop *)ele_dst,
+                                               aspect_y,
+                                               cd_loop_uv_offset);
+    }
     ok = true;
   }
 
@@ -529,24 +539,9 @@ static bool uv_shortest_path_pick_ex(Scene *scene,
       const bool select = (flush == 1);
       BMEditMesh *em = BKE_editmesh_from_object(obedit);
       if (ts->uv_flag & UV_SYNC_SELECTION) {
-        if (uv_selectmode & UV_SELECT_EDGE) {
-          /* Special case as we don't use true edge selection,
-           * flush the selection from the vertices. */
-          BM_mesh_select_mode_flush_ex(em->bm, SCE_SELECT_VERTEX, BM_SELECT_LEN_FLUSH_RECALC_ALL);
-        }
         ED_uvedit_select_sync_flush(scene->toolsettings, em, select);
       }
       else {
-        if (uv_selectmode & UV_SELECT_EDGE) {
-          /* TODO(@sidd017): Remove this case when adding proper uv edge support for this operator.
-           * In the meantime, this case helps ensures proper UV selection states for edge mode. */
-          if (select) {
-            uvedit_select_flush(scene, em);
-          }
-          else {
-            uvedit_deselect_flush(scene, em);
-          }
-        }
         ED_uvedit_selectmode_flush(scene, em);
       }
     }
@@ -804,7 +799,7 @@ static int uv_shortest_path_select_exec(bContext *C, wmOperator *op)
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
diff --git a/source/blender/editors/uvedit/uvedit_rip.c b/source/blender/editors/uvedit/uvedit_rip.c
index 545cc57e3c4..5497b9cd1e5 100644
--- a/source/blender/editors/uvedit/uvedit_rip.c
+++ b/source/blender/editors/uvedit/uvedit_rip.c
@@ -848,7 +848,7 @@ static bool uv_rip_object(Scene *scene, Object *obedit, const float co[2], const
               BMLoop *l_iter = BLI_gsetIterator_getKey(&gs_iter);
               ULData *ul = UL(l_iter);
               if (ul->side == side_from_cursor) {
-                uvedit_uv_select_disable(scene, em, l_iter, cd_loop_uv_offset);
+                uvedit_uv_select_disable(scene, em->bm, l_iter, cd_loop_uv_offset);
                 changed = true;
               }
               /* Ensure we don't operate on these again. */
@@ -866,7 +866,7 @@ static bool uv_rip_object(Scene *scene, Object *obedit, const float co[2], const
             BMLoop *l_iter = BLI_gsetIterator_getKey(&gs_iter);
             ULData *ul = UL(l_iter);
             if (ul->side == side_from_cursor) {
-              uvedit_uv_select_disable(scene, em, l_iter, cd_loop_uv_offset);
+              uvedit_uv_select_disable(scene, em->bm, l_iter, cd_loop_uv_offset);
               changed = true;
             }
             /* Ensure we don't operate on these again. */
@@ -910,7 +910,7 @@ static int uv_rip_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/uvedit/uvedit_select.c b/source/blender/editors/uvedit/uvedit_select.c
index db834f6a0fd..6c8fb9360bd 100644
--- a/source/blender/editors/uvedit/uvedit_select.c
+++ b/source/blender/editors/uvedit/uvedit_select.c
@@ -81,6 +81,7 @@ static void uv_select_tag_update_for_object(Depsgraph *depsgraph,
 typedef enum {
   UV_SSIM_AREA_UV = 1000,
   UV_SSIM_AREA_3D,
+  UV_SSIM_FACE,
   UV_SSIM_LENGTH_UV,
   UV_SSIM_LENGTH_3D,
   UV_SSIM_SIDES,
@@ -206,7 +207,7 @@ static void uvedit_vertex_select_tagged(BMEditMesh *em,
   BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
     BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
       if (BM_elem_flag_test(l->v, BM_ELEM_TAG)) {
-        uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+        uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
       }
     }
   }
@@ -264,7 +265,7 @@ void uvedit_face_select_set_with_sticky(const Scene *scene,
   const ToolSettings *ts = scene->toolsettings;
   const char sticky = ts->uv_sticky;
   if (ts->uv_flag & UV_SYNC_SELECTION) {
-    uvedit_face_select_set(scene, em, efa, select, do_history, cd_loop_uv_offset);
+    uvedit_face_select_set(scene, em->bm, efa, select, do_history, cd_loop_uv_offset);
     return;
   }
   if (!uvedit_face_visible_test(scene, efa)) {
@@ -274,7 +275,7 @@ void uvedit_face_select_set_with_sticky(const Scene *scene,
    * (not part of any face selections). This now uses the sticky location mode logic instead. */
   switch (sticky) {
     case SI_STICKY_DISABLE: {
-      uvedit_face_select_set(scene, em, efa, select, do_history, cd_loop_uv_offset);
+      uvedit_face_select_set(scene, em->bm, efa, select, do_history, cd_loop_uv_offset);
       break;
     }
     default: {
@@ -312,32 +313,30 @@ void uvedit_face_select_shared_vert(const Scene *scene,
 }
 
 void uvedit_face_select_set(const Scene *scene,
-                            BMEditMesh *em,
+                            BMesh *bm,
                             BMFace *efa,
                             const bool select,
                             const bool do_history,
                             const int cd_loop_uv_offset)
 {
   if (select) {
-    uvedit_face_select_enable(scene, em, efa, do_history, cd_loop_uv_offset);
+    uvedit_face_select_enable(scene, bm, efa, do_history, cd_loop_uv_offset);
   }
   else {
-    uvedit_face_select_disable(scene, em, efa, cd_loop_uv_offset);
+    uvedit_face_select_disable(scene, bm, efa, cd_loop_uv_offset);
   }
 }
 
-void uvedit_face_select_enable(const Scene *scene,
-                               BMEditMesh *em,
-                               BMFace *efa,
-                               const bool do_history,
-                               const int cd_loop_uv_offset)
+void uvedit_face_select_enable(
+    const Scene *scene, BMesh *bm, BMFace *efa, const bool do_history, const int cd_loop_uv_offset)
 {
+  BLI_assert(cd_loop_uv_offset >= 0);
   const ToolSettings *ts = scene->toolsettings;
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
-    BM_face_select_set(em->bm, efa, true);
+    BM_face_select_set(bm, efa, true);
     if (do_history) {
-      BM_select_history_store(em->bm, (BMElem *)efa);
+      BM_select_history_store(bm, (BMElem *)efa);
     }
   }
   else {
@@ -353,14 +352,15 @@ void uvedit_face_select_enable(const Scene *scene,
 }
 
 void uvedit_face_select_disable(const Scene *scene,
-                                BMEditMesh *em,
+                                BMesh *bm,
                                 BMFace *efa,
                                 const int cd_loop_uv_offset)
 {
+  BLI_assert(cd_loop_uv_offset >= 0);
   const ToolSettings *ts = scene->toolsettings;
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
-    BM_face_select_set(em->bm, efa, false);
+    BM_face_select_set(bm, efa, false);
   }
   else {
     BMLoop *l;
@@ -406,11 +406,11 @@ void uvedit_edge_select_set_with_sticky(const Scene *scene,
                                         BMLoop *l,
                                         const bool select,
                                         const bool do_history,
-                                        const uint cd_loop_uv_offset)
+                                        const int cd_loop_uv_offset)
 {
   const ToolSettings *ts = scene->toolsettings;
   if (ts->uv_flag & UV_SYNC_SELECTION) {
-    uvedit_edge_select_set(scene, em, l, select, do_history, cd_loop_uv_offset);
+    uvedit_edge_select_set(scene, em->bm, l, select, do_history, cd_loop_uv_offset);
     return;
   }
 
@@ -418,7 +418,7 @@ void uvedit_edge_select_set_with_sticky(const Scene *scene,
   switch (sticky) {
     case SI_STICKY_DISABLE: {
       if (uvedit_face_visible_test(scene, l->f)) {
-        uvedit_edge_select_set(scene, em, l, select, do_history, cd_loop_uv_offset);
+        uvedit_edge_select_set(scene, em->bm, l, select, do_history, cd_loop_uv_offset);
       }
       break;
     }
@@ -500,7 +500,7 @@ void uvedit_edge_select_set_noflush(const Scene *scene,
 }
 
 void uvedit_edge_select_set(const Scene *scene,
-                            BMEditMesh *em,
+                            BMesh *bm,
                             BMLoop *l,
                             const bool select,
                             const bool do_history,
@@ -508,36 +508,33 @@ void uvedit_edge_select_set(const Scene *scene,
 
 {
   if (select) {
-    uvedit_edge_select_enable(scene, em, l, do_history, cd_loop_uv_offset);
+    uvedit_edge_select_enable(scene, bm, l, do_history, cd_loop_uv_offset);
   }
   else {
-    uvedit_edge_select_disable(scene, em, l, cd_loop_uv_offset);
+    uvedit_edge_select_disable(scene, bm, l, cd_loop_uv_offset);
   }
 }
 
-void uvedit_edge_select_enable(const Scene *scene,
-                               BMEditMesh *em,
-                               BMLoop *l,
-                               const bool do_history,
-                               const int cd_loop_uv_offset)
+void uvedit_edge_select_enable(
+    const Scene *scene, BMesh *bm, BMLoop *l, const bool do_history, const int cd_loop_uv_offset)
 
 {
   const ToolSettings *ts = scene->toolsettings;
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
     if (ts->selectmode & SCE_SELECT_FACE) {
-      BM_face_select_set(em->bm, l->f, true);
+      BM_face_select_set(bm, l->f, true);
     }
     else if (ts->selectmode & SCE_SELECT_EDGE) {
-      BM_edge_select_set(em->bm, l->e, true);
+      BM_edge_select_set(bm, l->e, true);
     }
     else {
-      BM_vert_select_set(em->bm, l->e->v1, true);
-      BM_vert_select_set(em->bm, l->e->v2, true);
+      BM_vert_select_set(bm, l->e->v1, true);
+      BM_vert_select_set(bm, l->e->v2, true);
     }
 
     if (do_history) {
-      BM_select_history_store(em->bm, (BMElem *)l->e);
+      BM_select_history_store(bm, (BMElem *)l->e);
     }
   }
   else {
@@ -551,7 +548,7 @@ void uvedit_edge_select_enable(const Scene *scene,
 }
 
 void uvedit_edge_select_disable(const Scene *scene,
-                                BMEditMesh *em,
+                                BMesh *bm,
                                 BMLoop *l,
                                 const int cd_loop_uv_offset)
 
@@ -560,14 +557,14 @@ void uvedit_edge_select_disable(const Scene *scene,
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
     if (ts->selectmode & SCE_SELECT_FACE) {
-      BM_face_select_set(em->bm, l->f, false);
+      BM_face_select_set(bm, l->f, false);
     }
     else if (ts->selectmode & SCE_SELECT_EDGE) {
-      BM_edge_select_set(em->bm, l->e, false);
+      BM_edge_select_set(bm, l->e, false);
     }
     else {
-      BM_vert_select_set(em->bm, l->e->v1, false);
-      BM_vert_select_set(em->bm, l->e->v2, false);
+      BM_vert_select_set(bm, l->e->v1, false);
+      BM_vert_select_set(bm, l->e->v2, false);
     }
   }
   else {
@@ -628,11 +625,11 @@ void uvedit_uv_select_set_with_sticky(const Scene *scene,
                                       BMLoop *l,
                                       const bool select,
                                       const bool do_history,
-                                      const uint cd_loop_uv_offset)
+                                      const int cd_loop_uv_offset)
 {
   const ToolSettings *ts = scene->toolsettings;
   if (ts->uv_flag & UV_SYNC_SELECTION) {
-    uvedit_uv_select_set(scene, em, l, select, do_history, cd_loop_uv_offset);
+    uvedit_uv_select_set(scene, em->bm, l, select, do_history, cd_loop_uv_offset);
     return;
   }
 
@@ -640,7 +637,7 @@ void uvedit_uv_select_set_with_sticky(const Scene *scene,
   switch (sticky) {
     case SI_STICKY_DISABLE: {
       if (uvedit_face_visible_test(scene, l->f)) {
-        uvedit_uv_select_set(scene, em, l, select, do_history, cd_loop_uv_offset);
+        uvedit_uv_select_set(scene, em->bm, l, select, do_history, cd_loop_uv_offset);
       }
       break;
     }
@@ -694,7 +691,8 @@ void uvedit_uv_select_shared_vert(const Scene *scene,
           }
 
           if (do_select) {
-            uvedit_uv_select_set(scene, em, l_radial_iter, select, do_history, cd_loop_uv_offset);
+            uvedit_uv_select_set(
+                scene, em->bm, l_radial_iter, select, do_history, cd_loop_uv_offset);
           }
         }
       }
@@ -703,25 +701,22 @@ void uvedit_uv_select_shared_vert(const Scene *scene,
 }
 
 void uvedit_uv_select_set(const Scene *scene,
-                          BMEditMesh *em,
+                          BMesh *bm,
                           BMLoop *l,
                           const bool select,
                           const bool do_history,
                           const int cd_loop_uv_offset)
 {
   if (select) {
-    uvedit_uv_select_enable(scene, em, l, do_history, cd_loop_uv_offset);
+    uvedit_uv_select_enable(scene, bm, l, do_history, cd_loop_uv_offset);
   }
   else {
-    uvedit_uv_select_disable(scene, em, l, cd_loop_uv_offset);
+    uvedit_uv_select_disable(scene, bm, l, cd_loop_uv_offset);
   }
 }
 
-void uvedit_uv_select_enable(const Scene *scene,
-                             BMEditMesh *em,
-                             BMLoop *l,
-                             const bool do_history,
-                             const int cd_loop_uv_offset)
+void uvedit_uv_select_enable(
+    const Scene *scene, BMesh *bm, BMLoop *l, const bool do_history, const int cd_loop_uv_offset)
 {
   const ToolSettings *ts = scene->toolsettings;
 
@@ -731,14 +726,14 @@ void uvedit_uv_select_enable(const Scene *scene,
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
     if (ts->selectmode & SCE_SELECT_FACE) {
-      BM_face_select_set(em->bm, l->f, true);
+      BM_face_select_set(bm, l->f, true);
     }
     else {
-      BM_vert_select_set(em->bm, l->v, true);
+      BM_vert_select_set(bm, l->v, true);
     }
 
     if (do_history) {
-      BM_select_history_store(em->bm, (BMElem *)l->v);
+      BM_select_history_store(bm, (BMElem *)l->v);
     }
   }
   else {
@@ -748,7 +743,7 @@ void uvedit_uv_select_enable(const Scene *scene,
 }
 
 void uvedit_uv_select_disable(const Scene *scene,
-                              BMEditMesh *em,
+                              BMesh *bm,
                               BMLoop *l,
                               const int cd_loop_uv_offset)
 {
@@ -756,10 +751,10 @@ void uvedit_uv_select_disable(const Scene *scene,
 
   if (ts->uv_flag & UV_SYNC_SELECTION) {
     if (ts->selectmode & SCE_SELECT_FACE) {
-      BM_face_select_set(em->bm, l->f, false);
+      BM_face_select_set(bm, l->f, false);
     }
     else {
-      BM_vert_select_set(em->bm, l->v, false);
+      BM_vert_select_set(bm, l->v, false);
     }
   }
   else {
@@ -1139,7 +1134,7 @@ BMLoop *uv_find_nearest_loop_from_vert(struct Scene *scene,
                                        const float co[2])
 {
   BMEditMesh *em = BKE_editmesh_from_object(obedit);
-  const uint cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+  const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
 
   BMIter liter;
   BMLoop *l;
@@ -1167,7 +1162,8 @@ BMLoop *uv_find_nearest_loop_from_edge(struct Scene *scene,
                                        const float co[2])
 {
   BMEditMesh *em = BKE_editmesh_from_object(obedit);
-  const uint cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+  const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+  BLI_assert(cd_loop_uv_offset >= 0);
 
   BMIter eiter;
   BMLoop *l;
@@ -1421,7 +1417,7 @@ static BMLoop *bm_select_edgeloop_single_side_next(const Scene *scene,
       scene, l_step, v_from_next, cd_loop_uv_offset);
 }
 
-/* TODO(campbell): support this in the BMesh API, as we have for clearing other types. */
+/* TODO(@campbellbarton): support this in the BMesh API, as we have for clearing other types. */
 static void bm_loop_tags_clear(BMesh *bm)
 {
   BMIter iter;
@@ -1974,7 +1970,7 @@ static void uv_select_linked_multi(Scene *scene,
     BM_face_select_set(em->bm, efa, value); \
   } \
   else { \
-    uvedit_face_select_set(scene, em, efa, value, false, cd_loop_uv_offset); \
+    uvedit_face_select_set(scene, em->bm, efa, value, false, cd_loop_uv_offset); \
   } \
   (void)0
 
@@ -2052,7 +2048,7 @@ static int uv_select_more_less(bContext *C, const bool select)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   const bool is_uv_face_selectmode = (ts->uv_selectmode == UV_SELECT_FACE);
 
@@ -2407,7 +2403,7 @@ static int uv_select_all_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   uv_select_all_perform_multi(scene, objects, objects_len, action);
 
@@ -2669,10 +2665,11 @@ static bool uv_mouse_select_multi(bContext *C,
 }
 static bool uv_mouse_select(bContext *C, const float co[2], const struct SelectPick_Params *params)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
   bool changed = uv_mouse_select_multi(C, objects, objects_len, co, params);
   MEM_freeN(objects);
   return changed;
@@ -2821,10 +2818,11 @@ static int uv_mouse_select_loop_generic(bContext *C,
                                         const bool extend,
                                         enum eUVLoopGenericType loop_type)
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
   int ret = uv_mouse_select_loop_generic_multi(C, objects, objects_len, co, extend, loop_type);
   MEM_freeN(objects);
   return ret;
@@ -2981,7 +2979,7 @@ static int uv_select_linked_internal(bContext *C, wmOperator *op, const wmEvent
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   if (pick) {
     float co[2];
@@ -3139,7 +3137,7 @@ static int uv_select_split_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -3246,7 +3244,7 @@ static void uv_select_flush_from_tag_sticky_loc_internal(const Scene *scene,
   UvMapVert *start_vlist = NULL, *vlist_iter;
   BMFace *efa_vlist;
 
-  uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+  uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
 
   vlist_iter = BM_uv_vert_map_at_index(vmap, BM_elem_index_get(l->v));
 
@@ -3264,7 +3262,6 @@ static void uv_select_flush_from_tag_sticky_loc_internal(const Scene *scene,
 
   vlist_iter = start_vlist;
   while (vlist_iter) {
-
     if (vlist_iter != start_vlist && vlist_iter->separate) {
       break;
     }
@@ -3277,7 +3274,7 @@ static void uv_select_flush_from_tag_sticky_loc_internal(const Scene *scene,
       l_other = BM_iter_at_index(
           em->bm, BM_LOOPS_OF_FACE, efa_vlist, vlist_iter->loop_of_poly_index);
 
-      uvedit_uv_select_set(scene, em, l_other, select, false, cd_loop_uv_offset);
+      uvedit_uv_select_set(scene, em->bm, l_other, select, false, cd_loop_uv_offset);
     }
     vlist_iter = vlist_iter->next;
   }
@@ -3344,7 +3341,7 @@ static void uv_select_flush_from_tag_face(const Scene *scene, Object *obedit, co
   else { /* SI_STICKY_DISABLE or ts->uv_flag & UV_SYNC_SELECTION */
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
       if (BM_elem_flag_test(efa, BM_ELEM_TAG)) {
-        uvedit_face_select_set(scene, em, efa, select, false, cd_loop_uv_offset);
+        uvedit_face_select_set(scene, em->bm, efa, select, false, cd_loop_uv_offset);
       }
     }
   }
@@ -3393,7 +3390,7 @@ static void uv_select_flush_from_tag_loop(const Scene *scene, Object *obedit, co
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
       BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
         if (BM_elem_flag_test(l->v, BM_ELEM_TAG)) {
-          uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+          uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
         }
       }
     }
@@ -3422,7 +3419,7 @@ static void uv_select_flush_from_tag_loop(const Scene *scene, Object *obedit, co
     BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
       BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
         if (BM_elem_flag_test(l, BM_ELEM_TAG)) {
-          uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+          uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
         }
       }
     }
@@ -3543,7 +3540,7 @@ static int uv_box_select_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   if (use_pre_deselect) {
     uv_select_all_perform_multi(scene, objects, objects_len, SEL_DESELECT);
@@ -3582,6 +3579,7 @@ static int uv_box_select_exec(bContext *C, wmOperator *op)
       }
     }
     else if (use_edge && !pinned) {
+      bool do_second_pass = true;
       BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
         if (!uvedit_face_visible_test(scene, efa)) {
           continue;
@@ -3596,11 +3594,35 @@ static int uv_box_select_exec(bContext *C, wmOperator *op)
             uvedit_edge_select_set_with_sticky(
                 scene, em, l_prev, select, false, cd_loop_uv_offset);
             changed = true;
+            do_second_pass = false;
           }
           l_prev = l;
           luv_prev = luv;
         }
       }
+      /* Do a second pass if no complete edges could be selected.
+       * This matches wire-frame edit-mesh selection in the 3D view. */
+      if (do_second_pass) {
+        /* Second pass to check if edges partially overlap with the selection area (box). */
+        BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
+          if (!uvedit_face_visible_test(scene, efa)) {
+            continue;
+          }
+          BMLoop *l_prev = BM_FACE_FIRST_LOOP(efa)->prev;
+          MLoopUV *luv_prev = BM_ELEM_CD_GET_VOID_P(l_prev, cd_loop_uv_offset);
+
+          BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+            luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+            if (BLI_rctf_isect_segment(&rectf, luv_prev->uv, luv->uv)) {
+              uvedit_edge_select_set_with_sticky(
+                  scene, em, l_prev, select, false, cd_loop_uv_offset);
+              changed = true;
+            }
+            l_prev = l;
+            luv_prev = luv;
+          }
+        }
+      }
     }
     else {
       /* other selection modes */
@@ -3618,14 +3640,14 @@ static int uv_box_select_exec(bContext *C, wmOperator *op)
             if (!pinned || (ts->uv_flag & UV_SYNC_SELECTION)) {
               /* UV_SYNC_SELECTION - can't do pinned selection */
               if (BLI_rctf_isect_pt_v(&rectf, luv->uv)) {
-                uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+                uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
                 BM_elem_flag_enable(l->v, BM_ELEM_TAG);
                 has_selected = true;
               }
             }
             else if (pinned) {
               if ((luv->flag & MLOOPUV_PINNED) && BLI_rctf_isect_pt_v(&rectf, luv->uv)) {
-                uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+                uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
                 BM_elem_flag_enable(l->v, BM_ELEM_TAG);
               }
             }
@@ -3692,9 +3714,9 @@ void UV_OT_select_box(wmOperatorType *ot)
 /** \name Circle Select Operator
  * \{ */
 
-static int uv_circle_select_is_point_inside(const float uv[2],
-                                            const float offset[2],
-                                            const float ellipse[2])
+static bool uv_circle_select_is_point_inside(const float uv[2],
+                                             const float offset[2],
+                                             const float ellipse[2])
 {
   /* normalized ellipse: ell[0] = scaleX, ell[1] = scaleY */
   const float co[2] = {
@@ -3704,10 +3726,10 @@ static int uv_circle_select_is_point_inside(const float uv[2],
   return len_squared_v2(co) < 1.0f;
 }
 
-static int uv_circle_select_is_edge_inside(const float uv_a[2],
-                                           const float uv_b[2],
-                                           const float offset[2],
-                                           const float ellipse[2])
+static bool uv_circle_select_is_edge_inside(const float uv_a[2],
+                                            const float uv_b[2],
+                                            const float offset[2],
+                                            const float ellipse[2])
 {
   /* normalized ellipse: ell[0] = scaleX, ell[1] = scaleY */
   const float co_a[2] = {
@@ -3765,7 +3787,7 @@ static int uv_circle_select_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   const eSelectOp sel_op = ED_select_op_modal(RNA_enum_get(op->ptr, "mode"),
                                               WM_gesture_is_modal_first(op->customdata));
@@ -3838,7 +3860,7 @@ static int uv_circle_select_exec(bContext *C, wmOperator *op)
             luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
             if (uv_circle_select_is_point_inside(luv->uv, offset, ellipse)) {
               changed = true;
-              uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+              uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
               BM_elem_flag_enable(l->v, BM_ELEM_TAG);
               has_selected = true;
             }
@@ -3920,6 +3942,24 @@ static bool do_lasso_select_mesh_uv_is_point_inside(const ARegion *region,
   return false;
 }
 
+static bool do_lasso_select_mesh_uv_is_edge_inside(const ARegion *region,
+                                                   const rcti *clip_rect,
+                                                   const int mcoords[][2],
+                                                   const int mcoords_len,
+                                                   const float co_test_a[2],
+                                                   const float co_test_b[2])
+{
+  int co_screen_a[2], co_screen_b[2];
+  if (UI_view2d_view_to_region_segment_clip(
+          &region->v2d, co_test_a, co_test_b, co_screen_a, co_screen_b) &&
+      BLI_rcti_isect_segment(clip_rect, co_screen_a, co_screen_b) &&
+      BLI_lasso_is_edge_inside(
+          mcoords, mcoords_len, UNPACK2(co_screen_a), UNPACK2(co_screen_b), V2D_IS_CLIPPED)) {
+    return true;
+  }
+  return false;
+}
+
 static bool do_lasso_select_mesh_uv(bContext *C,
                                     const int mcoords[][2],
                                     const int mcoords_len,
@@ -3953,7 +3993,7 @@ static bool do_lasso_select_mesh_uv(bContext *C,
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   if (use_pre_deselect) {
     uv_select_all_perform_multi(scene, objects, objects_len, SEL_DESELECT);
@@ -3988,6 +4028,7 @@ static bool do_lasso_select_mesh_uv(bContext *C,
       }
     }
     else if (use_edge) {
+      bool do_second_pass = true;
       BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
         if (!uvedit_face_visible_test(scene, efa)) {
           continue;
@@ -4004,12 +4045,37 @@ static bool do_lasso_select_mesh_uv(bContext *C,
                   region, &rect, mcoords, mcoords_len, luv_prev->uv)) {
             uvedit_edge_select_set_with_sticky(
                 scene, em, l_prev, select, false, cd_loop_uv_offset);
+            do_second_pass = false;
             changed = true;
           }
           l_prev = l;
           luv_prev = luv;
         }
       }
+      /* Do a second pass if no complete edges could be selected.
+       * This matches wire-frame edit-mesh selection in the 3D view. */
+      if (do_second_pass) {
+        /* Second pass to check if edges partially overlap with the selection area (lasso). */
+        BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
+          if (!uvedit_face_visible_test(scene, efa)) {
+            continue;
+          }
+          BMLoop *l_prev = BM_FACE_FIRST_LOOP(efa)->prev;
+          MLoopUV *luv_prev = BM_ELEM_CD_GET_VOID_P(l_prev, cd_loop_uv_offset);
+
+          BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+            MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+            if (do_lasso_select_mesh_uv_is_edge_inside(
+                    region, &rect, mcoords, mcoords_len, luv->uv, luv_prev->uv)) {
+              uvedit_edge_select_set_with_sticky(
+                  scene, em, l_prev, select, false, cd_loop_uv_offset);
+              changed = true;
+            }
+            l_prev = l;
+            luv_prev = luv;
+          }
+        }
+      }
     }
     else { /* Vert Selection. */
       BM_mesh_elem_hflag_disable_all(em->bm, BM_VERT, BM_ELEM_TAG, false);
@@ -4024,7 +4090,7 @@ static bool do_lasso_select_mesh_uv(bContext *C,
             MLoopUV *luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
             if (do_lasso_select_mesh_uv_is_point_inside(
                     region, &rect, mcoords, mcoords_len, luv->uv)) {
-              uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+              uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
               changed = true;
               BM_elem_flag_enable(l->v, BM_ELEM_TAG);
               has_selected = true;
@@ -4126,7 +4192,7 @@ static int uv_select_pinned_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
@@ -4144,7 +4210,7 @@ static int uv_select_pinned_exec(bContext *C, wmOperator *op)
         luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 
         if (luv->flag & MLOOPUV_PINNED) {
-          uvedit_uv_select_enable(scene, em, l, false, cd_loop_uv_offset);
+          uvedit_uv_select_enable(scene, em->bm, l, false, cd_loop_uv_offset);
           changed = true;
         }
       }
@@ -4261,7 +4327,7 @@ static int uv_select_overlap(bContext *C, const bool extend)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   /* Calculate maximum number of tree nodes and prepare initial selection. */
   uint uv_tri_len = 0;
@@ -4397,8 +4463,8 @@ static int uv_select_overlap(bContext *C, const bool extend)
       /* Main tri-tri overlap test. */
       const float endpoint_bias = -1e-4f;
       if (overlap_tri_tri_uv_test(o_a->tri, o_b->tri, endpoint_bias)) {
-        uvedit_face_select_enable(scene, em_a, face_a, false, cd_loop_uv_offset_a);
-        uvedit_face_select_enable(scene, em_b, face_b, false, cd_loop_uv_offset_b);
+        uvedit_face_select_enable(scene, em_a->bm, face_a, false, cd_loop_uv_offset_a);
+        uvedit_face_select_enable(scene, em_b->bm, face_b, false, cd_loop_uv_offset_b);
       }
     }
 
@@ -4569,6 +4635,33 @@ static float get_uv_face_needle(const eUVSelectSimilar type,
   return result;
 }
 
+static float get_uv_island_needle(const eUVSelectSimilar type,
+                                  const struct FaceIsland *island,
+                                  const float ob_m3[3][3],
+                                  const int cd_loop_uv_offset)
+
+{
+  float result = 0.0f;
+  switch (type) {
+    case UV_SSIM_AREA_UV:
+      for (int i = 0; i < island->faces_len; i++) {
+        result += BM_face_calc_area_uv(island->faces[i], cd_loop_uv_offset);
+      }
+      break;
+    case UV_SSIM_AREA_3D:
+      for (int i = 0; i < island->faces_len; i++) {
+        result += BM_face_calc_area_with_mat3(island->faces[i], ob_m3);
+      }
+      break;
+    case UV_SSIM_FACE:
+      return island->faces_len;
+    default:
+      BLI_assert_unreachable();
+      return false;
+  }
+  return result;
+}
+
 static int uv_select_similar_vert_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
@@ -4582,7 +4675,7 @@ static int uv_select_similar_vert_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   int max_verts_selected_all = 0;
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -4667,7 +4760,7 @@ static int uv_select_similar_vert_exec(bContext *C, wmOperator *op)
         const float needle = get_uv_vert_needle(type, l->v, ob_m3, luv, cd_loop_uv_offset);
         bool select = ED_select_similar_compare_float_tree(tree_1d, needle, threshold, compare);
         if (select) {
-          uvedit_uv_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+          uvedit_uv_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
           changed = true;
         }
       }
@@ -4695,7 +4788,7 @@ static int uv_select_similar_edge_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   int max_edges_selected_all = 0;
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -4786,7 +4879,7 @@ static int uv_select_similar_edge_exec(bContext *C, wmOperator *op)
         float needle = get_uv_edge_needle(type, l->e, ob_m3, luv_a, luv_b, cd_loop_uv_offset);
         bool select = ED_select_similar_compare_float_tree(tree_1d, needle, threshold, compare);
         if (select) {
-          uvedit_edge_select_set(scene, em, l, select, false, cd_loop_uv_offset);
+          uvedit_edge_select_set(scene, em->bm, l, select, false, cd_loop_uv_offset);
           changed = true;
         }
       }
@@ -4814,7 +4907,7 @@ static int uv_select_similar_face_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   int max_faces_selected_all = 0;
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
@@ -4886,7 +4979,7 @@ static int uv_select_similar_face_exec(bContext *C, wmOperator *op)
 
       bool select = ED_select_similar_compare_float_tree(tree_1d, needle, threshold, compare);
       if (select) {
-        uvedit_face_select_set(scene, em, face, select, do_history, cd_loop_uv_offset);
+        uvedit_face_select_set(scene, em->bm, face, select, do_history, cd_loop_uv_offset);
         changed = true;
       }
     }
@@ -4900,6 +4993,136 @@ static int uv_select_similar_face_exec(bContext *C, wmOperator *op)
   return OPERATOR_FINISHED;
 }
 
+static bool uv_island_selected(const Scene *scene, struct FaceIsland *island)
+{
+  BLI_assert(island && island->faces_len);
+  return uvedit_face_select_test(scene, island->faces[0], island->cd_loop_uv_offset);
+}
+
+static int uv_select_similar_island_exec(bContext *C, wmOperator *op)
+{
+  Scene *scene = CTX_data_scene(C);
+  ViewLayer *view_layer = CTX_data_view_layer(C);
+  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
+  ToolSettings *ts = CTX_data_tool_settings(C);
+
+  const eUVSelectSimilar type = RNA_enum_get(op->ptr, "type");
+  const float threshold = RNA_float_get(op->ptr, "threshold");
+  const eSimilarCmp compare = RNA_enum_get(op->ptr, "compare");
+
+  uint objects_len = 0;
+  Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
+      scene, view_layer, ((View3D *)NULL), &objects_len);
+
+  ListBase *island_list_ptr = MEM_callocN(sizeof(*island_list_ptr) * objects_len, __func__);
+  int island_list_len = 0;
+
+  const bool face_selected = !(scene->toolsettings->uv_flag & UV_SYNC_SELECTION);
+
+  for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+    Object *obedit = objects[ob_index];
+    BMEditMesh *em = BKE_editmesh_from_object(obedit);
+    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+    if (cd_loop_uv_offset == -1) {
+      continue;
+    }
+
+    float aspect_y = 1.0f; /* Placeholder value, aspect doesn't change connectivity. */
+    island_list_len += bm_mesh_calc_uv_islands(scene,
+                                               em->bm,
+                                               &island_list_ptr[ob_index],
+                                               face_selected,
+                                               false,
+                                               false,
+                                               aspect_y,
+                                               cd_loop_uv_offset);
+  }
+
+  struct FaceIsland **island_array = MEM_callocN(sizeof(*island_array) * island_list_len,
+                                                 __func__);
+
+  int tree_index = 0;
+  KDTree_1d *tree_1d = BLI_kdtree_1d_new(island_list_len);
+
+  for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+    Object *obedit = objects[ob_index];
+    BMEditMesh *em = BKE_editmesh_from_object(obedit);
+    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+    if (cd_loop_uv_offset == -1) {
+      continue;
+    }
+
+    float ob_m3[3][3];
+    copy_m3_m4(ob_m3, obedit->obmat);
+
+    int index;
+    LISTBASE_FOREACH_INDEX (struct FaceIsland *, island, &island_list_ptr[ob_index], index) {
+      island_array[index] = island;
+      if (!uv_island_selected(scene, island)) {
+        continue;
+      }
+      float needle = get_uv_island_needle(type, island, ob_m3, cd_loop_uv_offset);
+      if (tree_1d) {
+        BLI_kdtree_1d_insert(tree_1d, tree_index++, &needle);
+      }
+    }
+  }
+
+  if (tree_1d != NULL) {
+    BLI_kdtree_1d_deduplicate(tree_1d);
+    BLI_kdtree_1d_balance(tree_1d);
+  }
+
+  int tot_island_index = 0;
+  for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+    Object *obedit = objects[ob_index];
+    BMEditMesh *em = BKE_editmesh_from_object(obedit);
+    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+    if (cd_loop_uv_offset == -1) {
+      continue;
+    }
+    float ob_m3[3][3];
+    copy_m3_m4(ob_m3, obedit->obmat);
+
+    bool changed = false;
+    int index;
+    LISTBASE_FOREACH_INDEX (struct FaceIsland *, island, &island_list_ptr[ob_index], index) {
+      island_array[tot_island_index++] = island; /* To deallocate later. */
+      if (uv_island_selected(scene, island)) {
+        continue;
+      }
+      float needle = get_uv_island_needle(type, island, ob_m3, cd_loop_uv_offset);
+      bool select = ED_select_similar_compare_float_tree(tree_1d, needle, threshold, compare);
+      if (!select) {
+        continue;
+      }
+      bool do_history = false;
+      for (int j = 0; j < island->faces_len; j++) {
+        uvedit_face_select_set(
+            scene, em->bm, island->faces[j], select, do_history, island->cd_loop_uv_offset);
+      }
+      changed = true;
+    }
+
+    if (changed) {
+      uv_select_tag_update_for_object(depsgraph, ts, obedit);
+    }
+  }
+
+  BLI_assert(tot_island_index == island_list_len);
+  for (int i = 0; i < island_list_len; i++) {
+    MEM_SAFE_FREE(island_array[i]->faces);
+    MEM_SAFE_FREE(island_array[i]);
+  }
+
+  MEM_SAFE_FREE(island_array);
+  MEM_SAFE_FREE(island_list_ptr);
+  MEM_SAFE_FREE(objects);
+  BLI_kdtree_1d_free(tree_1d);
+
+  return OPERATOR_FINISHED;
+}
+
 /* Select similar UV faces/edges/verts based on current selection. */
 static int uv_select_similar_exec(bContext *C, wmOperator *op)
 {
@@ -4921,7 +5144,7 @@ static int uv_select_similar_exec(bContext *C, wmOperator *op)
     return uv_select_similar_face_exec(C, op);
   }
   if (selectmode & UV_SELECT_ISLAND) {
-    // return uv_select_similar_island_exec(C, op);
+    return uv_select_similar_island_exec(C, op);
   }
 
   return uv_select_similar_vert_exec(C, op);
@@ -4942,6 +5165,12 @@ static EnumPropertyItem prop_face_similar_types[] = {
     {UV_SSIM_MATERIAL, "MATERIAL", 0, "Material", ""},
     {0}};
 
+static EnumPropertyItem prop_island_similar_types[] = {
+    {UV_SSIM_AREA_UV, "AREA", 0, "Area", ""},
+    {UV_SSIM_AREA_3D, "AREA_3D", 0, "Area 3D", ""},
+    {UV_SSIM_FACE, "FACE", 0, "Amount of Faces in Island", ""},
+    {0}};
+
 static EnumPropertyItem prop_similar_compare_types[] = {{SIM_CMP_EQ, "EQUAL", 0, "Equal", ""},
                                                         {SIM_CMP_GT, "GREATER", 0, "Greater", ""},
                                                         {SIM_CMP_LT, "LESS", 0, "Less", ""},
@@ -4961,6 +5190,9 @@ static const EnumPropertyItem *uv_select_similar_type_itemf(bContext *C,
     if (selectmode & UV_SELECT_FACE) {
       return prop_face_similar_types;
     }
+    if (selectmode & UV_SELECT_ISLAND) {
+      return prop_island_similar_types;
+    }
   }
 
   return prop_vert_similar_types;
@@ -5154,12 +5386,12 @@ static void uv_isolate_selected_islands(const Scene *scene,
   BLI_assert((scene->toolsettings->uv_flag & UV_SYNC_SELECTION) == 0);
   BMFace *efa;
   BMIter iter, liter;
-  UvElementMap *elementmap = BM_uv_element_map_create(em->bm, scene, true, false, false, true);
+  UvElementMap *elementmap = BM_uv_element_map_create(em->bm, scene, false, false, true, true);
   if (elementmap == NULL) {
     return;
   }
 
-  int num_islands = elementmap->totalIslands;
+  int num_islands = elementmap->total_islands;
   /* Boolean array that tells if island with index i is completely selected or not. */
   bool *is_island_not_selected = MEM_callocN(sizeof(bool) * (num_islands), __func__);
 
@@ -5251,7 +5483,7 @@ void ED_uvedit_selectmode_clean(const Scene *scene, Object *obedit)
         if (uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
           BM_elem_flag_enable(efa, BM_ELEM_TAG);
         }
-        uvedit_face_select_set(scene, em, efa, false, false, cd_loop_uv_offset);
+        uvedit_face_select_set(scene, em->bm, efa, false, false, cd_loop_uv_offset);
       }
     }
     uv_select_flush_from_tag_face(scene, obedit, true);
@@ -5273,7 +5505,7 @@ void ED_uvedit_selectmode_clean_multi(bContext *C)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, ((View3D *)NULL), &objects_len);
+      scene, view_layer, ((View3D *)NULL), &objects_len);
 
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
diff --git a/source/blender/editors/uvedit/uvedit_smart_stitch.c b/source/blender/editors/uvedit/uvedit_smart_stitch.c
index 55e44607f6f..05b98ab9627 100644
--- a/source/blender/editors/uvedit/uvedit_smart_stitch.c
+++ b/source/blender/editors/uvedit/uvedit_smart_stitch.c
@@ -287,14 +287,6 @@ static void stitch_update_header(StitchStateContainer *ssc, bContext *C)
   }
 }
 
-static int getNumOfIslandUvs(UvElementMap *elementMap, int island)
-{
-  if (island == elementMap->totalIslands - 1) {
-    return elementMap->totalUVs - elementMap->islandIndices[island];
-  }
-  return elementMap->islandIndices[island + 1] - elementMap->islandIndices[island];
-}
-
 static void stitch_uv_rotate(const float mat[2][2],
                              const float medianPoint[2],
                              float uv[2],
@@ -419,10 +411,9 @@ static void stitch_calculate_island_snapping(StitchState *state,
                                              int final)
 {
   BMesh *bm = state->em->bm;
-  int i;
   UvElement *element;
 
-  for (i = 0; i < state->element_map->totalIslands; i++) {
+  for (int i = 0; i < state->element_map->total_islands; i++) {
     if (island_stitch_data[i].addedForPreview) {
       int numOfIslandUVs = 0, j;
       int totelem = island_stitch_data[i].num_rot_elements_neg +
@@ -464,8 +455,8 @@ static void stitch_calculate_island_snapping(StitchState *state,
       }
 
       angle_to_mat2(rotation_mat, rotation);
-      numOfIslandUVs = getNumOfIslandUvs(state->element_map, i);
-      element = &state->element_map->buf[state->element_map->islandIndices[i]];
+      numOfIslandUVs = state->element_map->island_total_uvs[i];
+      element = &state->element_map->storage[state->element_map->island_indices[i]];
       for (j = 0; j < numOfIslandUVs; j++, element++) {
         /* stitchable uvs have already been processed, don't process */
         if (!(element->flag & STITCH_PROCESSED)) {
@@ -527,8 +518,8 @@ static void stitch_island_calculate_edge_rotation(UvEdge *edge,
   luv2 = CustomData_bmesh_get(&bm->ldata, element2->l->head.data, CD_MLOOPUV);
 
   if (ssc->mode == STITCH_VERT) {
-    index1 = uvfinal_map[element1 - state->element_map->buf];
-    index2 = uvfinal_map[element2 - state->element_map->buf];
+    index1 = uvfinal_map[element1 - state->element_map->storage];
+    index2 = uvfinal_map[element2 - state->element_map->storage];
   }
   else {
     index1 = edge->uv1;
@@ -569,27 +560,17 @@ static void stitch_island_calculate_vert_rotation(UvElement *element,
                                                   StitchState *state,
                                                   IslandStitchData *island_stitch_data)
 {
-  float edgecos = 1.0f, edgesin = 0.0f;
-  int index;
-  UvElement *element_iter;
   float rotation = 0, rotation_neg = 0;
   int rot_elem = 0, rot_elem_neg = 0;
-  BMLoop *l;
 
   if (element->island == ssc->static_island && !ssc->midpoints) {
     return;
   }
 
-  l = element->l;
-
-  index = BM_elem_index_get(l->v);
-
-  element_iter = state->element_map->vert[index];
-
+  UvElement *element_iter = BM_uv_element_get_head(state->element_map, element);
   for (; element_iter; element_iter = element_iter->next) {
     if (element_iter->separate &&
         stitch_check_uvs_state_stitchable(element, element_iter, ssc, state)) {
-      int index_tmp1, index_tmp2;
       float normal[2];
 
       /* only calculate rotation against static island uv verts */
@@ -597,14 +578,14 @@ static void stitch_island_calculate_vert_rotation(UvElement *element,
         continue;
       }
 
-      index_tmp1 = element_iter - state->element_map->buf;
+      int index_tmp1 = element_iter - state->element_map->storage;
       index_tmp1 = state->map[index_tmp1];
-      index_tmp2 = element - state->element_map->buf;
+      int index_tmp2 = element - state->element_map->storage;
       index_tmp2 = state->map[index_tmp2];
 
       negate_v2_v2(normal, state->normals + index_tmp2 * 2);
-      edgecos = dot_v2v2(normal, state->normals + index_tmp1 * 2);
-      edgesin = cross_v2v2(normal, state->normals + index_tmp1 * 2);
+      float edgecos = dot_v2v2(normal, state->normals + index_tmp1 * 2);
+      float edgesin = cross_v2v2(normal, state->normals + index_tmp1 * 2);
       if (edgesin > 0.0f) {
         rotation += acosf(max_ff(-1.0f, min_ff(1.0f, edgecos)));
         rot_elem++;
@@ -653,9 +634,8 @@ static void state_delete(StitchState *state)
     if (state->edges) {
       MEM_freeN(state->edges);
     }
-    if (state->stitch_preview) {
-      stitch_preview_delete(state->stitch_preview);
-    }
+    stitch_preview_delete(state->stitch_preview);
+    state->stitch_preview = NULL;
     if (state->edge_hash) {
       BLI_ghash_free(state->edge_hash, NULL, NULL);
     }
@@ -680,10 +660,7 @@ static void stitch_uv_edge_generate_linked_edges(GHash *edge_hash, StitchState *
   UvEdge *edges = state->edges;
   const int *map = state->map;
   UvElementMap *element_map = state->element_map;
-  UvElement *first_element = element_map->buf;
-  int i;
-
-  for (i = 0; i < state->total_separate_edges; i++) {
+  for (int i = 0; i < state->total_separate_edges; i++) {
     UvEdge *edge = edges + i;
 
     if (edge->first) {
@@ -696,7 +673,7 @@ static void stitch_uv_edge_generate_linked_edges(GHash *edge_hash, StitchState *
       UvElement *element2 = state->uvs[edge->uv2];
 
       /* Now iterate through all faces and try to find edges sharing the same vertices */
-      UvElement *iter1 = element_map->vert[BM_elem_index_get(element1->l->v)];
+      UvElement *iter1 = BM_uv_element_get_head(state->element_map, element1);
       UvEdge *last_set = edge;
       int elemindex2 = BM_elem_index_get(element2->l->v);
 
@@ -714,8 +691,8 @@ static void stitch_uv_edge_generate_linked_edges(GHash *edge_hash, StitchState *
         }
 
         if (iter2) {
-          int index1 = map[iter1 - first_element];
-          int index2 = map[iter2 - first_element];
+          int index1 = map[iter1 - element_map->storage];
+          int index2 = map[iter2 - element_map->storage];
           UvEdge edgetmp;
           UvEdge *edge2, *eiter;
           bool valid = true;
@@ -764,15 +741,7 @@ static void determine_uv_stitchability(UvElement *element,
                                        StitchState *state,
                                        IslandStitchData *island_stitch_data)
 {
-  int vert_index;
-  UvElement *element_iter;
-  BMLoop *l;
-
-  l = element->l;
-
-  vert_index = BM_elem_index_get(l->v);
-  element_iter = state->element_map->vert[vert_index];
-
+  UvElement *element_iter = BM_uv_element_get_head(state->element_map, element);
   for (; element_iter; element_iter = element_iter->next) {
     if (element_iter->separate) {
       if (stitch_check_uvs_stitchable(element, element_iter, ssc, state)) {
@@ -853,16 +822,7 @@ static void stitch_validate_uv_stitchability(UvElement *element,
     return;
   }
 
-  UvElement *element_iter;
-  int vert_index;
-  BMLoop *l;
-
-  l = element->l;
-
-  vert_index = BM_elem_index_get(l->v);
-
-  element_iter = state->element_map->vert[vert_index];
-
+  UvElement *element_iter = BM_uv_element_get_head(state->element_map, element);
   for (; element_iter; element_iter = element_iter->next) {
     if (element_iter->separate) {
       if (element_iter == element) {
@@ -956,7 +916,7 @@ static void stitch_propagate_uv_final_position(Scene *scene,
       if (final) {
         copy_v2_v2(luv->uv, final_position[index].uv);
 
-        uvedit_uv_select_enable(scene, state->em, l, false, cd_loop_uv_offset);
+        uvedit_uv_select_enable(scene, state->em->bm, l, false, cd_loop_uv_offset);
       }
       else {
         int face_preview_pos =
@@ -1015,7 +975,7 @@ static int stitch_process_data(StitchStateContainer *ssc,
     preview_position[i].data_position = STITCH_NO_PREVIEW;
   }
 
-  island_stitch_data = MEM_callocN(sizeof(*island_stitch_data) * state->element_map->totalIslands,
+  island_stitch_data = MEM_callocN(sizeof(*island_stitch_data) * state->element_map->total_islands,
                                    "stitch_island_data");
   if (!island_stitch_data) {
     return 0;
@@ -1040,7 +1000,7 @@ static int stitch_process_data(StitchStateContainer *ssc,
   }
 
   /* Remember stitchable candidates as places the 'I' button will stop at. */
-  for (int island_idx = 0; island_idx < state->element_map->totalIslands; island_idx++) {
+  for (int island_idx = 0; island_idx < state->element_map->total_islands; island_idx++) {
     state->island_is_stitchable[island_idx] = island_stitch_data[island_idx].stitchableCandidate ?
                                                   true :
                                                   false;
@@ -1048,10 +1008,10 @@ static int stitch_process_data(StitchStateContainer *ssc,
 
   if (is_active_state) {
     /* set static island to one that is added for preview */
-    ssc->static_island %= state->element_map->totalIslands;
+    ssc->static_island %= state->element_map->total_islands;
     while (!(island_stitch_data[ssc->static_island].stitchableCandidate)) {
       ssc->static_island++;
-      ssc->static_island %= state->element_map->totalIslands;
+      ssc->static_island %= state->element_map->total_islands;
       /* this is entirely possible if for example limit stitching
        * with no stitchable verts or no selection */
       if (ssc->static_island == previous_island) {
@@ -1172,13 +1132,11 @@ static int stitch_process_data(StitchStateContainer *ssc,
    * Setup preview for stitchable islands *
    ****************************************/
   if (ssc->snap_islands) {
-    for (i = 0; i < state->element_map->totalIslands; i++) {
+    for (i = 0; i < state->element_map->total_islands; i++) {
       if (island_stitch_data[i].addedForPreview) {
-        int numOfIslandUVs = 0, j;
-        UvElement *element;
-        numOfIslandUVs = getNumOfIslandUvs(state->element_map, i);
-        element = &state->element_map->buf[state->element_map->islandIndices[i]];
-        for (j = 0; j < numOfIslandUVs; j++, element++) {
+        int numOfIslandUVs = state->element_map->island_total_uvs[i];
+        UvElement *element = &state->element_map->storage[state->element_map->island_indices[i]];
+        for (int j = 0; j < numOfIslandUVs; j++, element++) {
           stitch_set_face_preview_buffer_position(element->l->f, preview, preview_position);
         }
       }
@@ -1263,7 +1221,7 @@ static int stitch_process_data(StitchStateContainer *ssc,
   if (ssc->mode == STITCH_VERT) {
     final_position = MEM_callocN(state->selection_size * sizeof(*final_position),
                                  "stitch_uv_average");
-    uvfinal_map = MEM_mallocN(state->element_map->totalUVs * sizeof(*uvfinal_map),
+    uvfinal_map = MEM_mallocN(state->element_map->total_uvs * sizeof(*uvfinal_map),
                               "stitch_uv_final_map");
   }
   else {
@@ -1279,12 +1237,11 @@ static int stitch_process_data(StitchStateContainer *ssc,
       if (element->flag & STITCH_STITCHABLE) {
         BMLoop *l;
         MLoopUV *luv;
-        UvElement *element_iter;
 
         l = element->l;
         luv = CustomData_bmesh_get(&bm->ldata, l->head.data, CD_MLOOPUV);
 
-        uvfinal_map[element - state->element_map->buf] = i;
+        uvfinal_map[element - state->element_map->storage] = i;
 
         copy_v2_v2(final_position[i].uv, luv->uv);
         final_position[i].count = 1;
@@ -1293,8 +1250,7 @@ static int stitch_process_data(StitchStateContainer *ssc,
           continue;
         }
 
-        element_iter = state->element_map->vert[BM_elem_index_get(l->v)];
-
+        UvElement *element_iter = state->element_map->vertex[BM_elem_index_get(l->v)];
         for (; element_iter; element_iter = element_iter->next) {
           if (element_iter->separate) {
             if (stitch_check_uvs_state_stitchable(element, element_iter, ssc, state)) {
@@ -1542,6 +1498,7 @@ static int stitch_process_data_all(StitchStateContainer *ssc, Scene *scene, int
 static uint uv_edge_hash(const void *key)
 {
   const UvEdge *edge = key;
+  BLI_assert(edge->uv1 < edge->uv2);
   return (BLI_ghashutil_uinthash(edge->uv2) + BLI_ghashutil_uinthash(edge->uv1));
 }
 
@@ -1549,6 +1506,8 @@ static bool uv_edge_compare(const void *a, const void *b)
 {
   const UvEdge *edge1 = a;
   const UvEdge *edge2 = b;
+  BLI_assert(edge1->uv1 < edge1->uv2);
+  BLI_assert(edge2->uv1 < edge2->uv2);
 
   if ((edge1->uv1 == edge2->uv1) && (edge1->uv2 == edge2->uv2)) {
     return 0;
@@ -1588,13 +1547,8 @@ static void stitch_select_edge(UvEdge *edge, StitchState *state, int always_sele
 /* Select all common uvs */
 static void stitch_select_uv(UvElement *element, StitchState *state, int always_select)
 {
-  BMLoop *l;
-  UvElement *element_iter;
   UvElement **selection_stack = (UvElement **)state->selection_stack;
-
-  l = element->l;
-
-  element_iter = state->element_map->vert[BM_elem_index_get(l->v)];
+  UvElement *element_iter = BM_uv_element_get_head(state->element_map, element);
   /* first deselect all common uvs */
   for (; element_iter; element_iter = element_iter->next) {
     if (element_iter->separate) {
@@ -1710,7 +1664,7 @@ static void stitch_calculate_edge_normal(BMEditMesh *em, UvEdge *edge, float *no
 static void stitch_draw_vbo(GPUVertBuf *vbo, GPUPrimType prim_type, const float col[4])
 {
   GPUBatch *batch = GPU_batch_create_ex(prim_type, vbo, NULL, GPU_BATCH_OWNS_VBO);
-  GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_UNIFORM_COLOR);
+  GPU_batch_program_set_builtin(batch, GPU_SHADER_3D_UNIFORM_COLOR);
   GPU_batch_uniform_4fv(batch, "color", col);
   GPU_batch_draw(batch);
   GPU_batch_discard(batch);
@@ -1850,8 +1804,8 @@ static UvEdge *uv_edge_get(BMLoop *l, StitchState *state)
   UvElement *element1 = BM_uv_element_get(state->element_map, l->f, l);
   UvElement *element2 = BM_uv_element_get(state->element_map, l->f, l->next);
 
-  int uv1 = state->map[element1 - state->element_map->buf];
-  int uv2 = state->map[element2 - state->element_map->buf];
+  int uv1 = state->map[element1 - state->element_map->storage];
+  int uv2 = state->map[element2 - state->element_map->storage];
 
   if (uv1 < uv2) {
     tmp_edge.uv1 = uv1;
@@ -1878,7 +1832,6 @@ static StitchState *stitch_init(bContext *C,
   int total_edges;
   /* maps uvelements to their first coincident uv */
   int *map;
-  int counter = 0, i;
   BMFace *efa;
   BMLoop *l;
   BMIter iter, liter;
@@ -1902,15 +1855,7 @@ static StitchState *stitch_init(bContext *C,
    * for stitch this isn't useful behavior, see T86924. */
   const int selectmode_orig = scene->toolsettings->selectmode;
   scene->toolsettings->selectmode = SCE_SELECT_VERTEX;
-
-  /* in uv synch selection, all uv's are visible */
-  if (ts->uv_flag & UV_SYNC_SELECTION) {
-    state->element_map = BM_uv_element_map_create(state->em->bm, scene, false, false, true, true);
-  }
-  else {
-    state->element_map = BM_uv_element_map_create(state->em->bm, scene, true, false, true, true);
-  }
-
+  state->element_map = BM_uv_element_map_create(state->em->bm, scene, false, true, true, true);
   scene->toolsettings->selectmode = selectmode_orig;
 
   if (!state->element_map) {
@@ -1921,45 +1866,39 @@ static StitchState *stitch_init(bContext *C,
   ED_uvedit_get_aspect(obedit, &aspx, &aspy);
   state->aspect = aspx / aspy;
 
-  /* Count 'unique' uvs */
-  for (i = 0; i < state->element_map->totalUVs; i++) {
-    if (state->element_map->buf[i].separate) {
-      counter++;
-    }
-  }
+  int unique_uvs = state->element_map->total_unique_uvs;
+  state->total_separate_uvs = unique_uvs;
 
-  /* explicitly set preview to NULL,
-   * to avoid deleting an invalid pointer on stitch_process_data */
-  state->stitch_preview = NULL;
   /* Allocate the unique uv buffers */
-  state->uvs = MEM_mallocN(sizeof(*state->uvs) * counter, "uv_stitch_unique_uvs");
+  state->uvs = MEM_mallocN(sizeof(*state->uvs) * unique_uvs, "uv_stitch_unique_uvs");
   /* internal uvs need no normals but it is hard and slow to keep a map of
-   * normals only for boundary uvs, so allocating for all uvs */
-  state->normals = MEM_callocN(sizeof(*state->normals) * counter * 2, "uv_stitch_normals");
-  state->total_separate_uvs = counter;
-  state->map = map = MEM_mallocN(sizeof(*map) * state->element_map->totalUVs,
+   * normals only for boundary uvs, so allocating for all uvs.
+   * Times 2 because each `float[2]` is stored as `{n[2 * i], n[2*i + 1]}`. */
+  state->normals = MEM_callocN(sizeof(*state->normals) * 2 * unique_uvs, "uv_stitch_normals");
+  state->map = map = MEM_mallocN(sizeof(*map) * state->element_map->total_uvs,
                                  "uv_stitch_unique_map");
   /* Allocate the edge stack */
   edge_hash = BLI_ghash_new(uv_edge_hash, uv_edge_compare, "stitch_edge_hash");
-  all_edges = MEM_mallocN(sizeof(*all_edges) * state->element_map->totalUVs, "ssc_edges");
+  all_edges = MEM_mallocN(sizeof(*all_edges) * state->element_map->total_uvs, "ssc_edges");
 
+  BLI_assert(!state->stitch_preview); /* Paranoia. */
   if (!state->uvs || !map || !edge_hash || !all_edges) {
     state_delete(state);
     return NULL;
   }
 
-  /* So that we can use this as index for the UvElements */
-  counter = -1;
+  /* Index for the UvElements. */
+  int counter = -1;
   /* initialize the unique UVs and map */
-  for (i = 0; i < em->bm->totvert; i++) {
-    UvElement *element = state->element_map->vert[i];
+  for (int i = 0; i < em->bm->totvert; i++) {
+    UvElement *element = state->element_map->vertex[i];
     for (; element; element = element->next) {
       if (element->separate) {
         counter++;
         state->uvs[counter] = element;
       }
       /* Pointer arithmetic to the rescue, as always :). */
-      map[element - state->element_map->buf] = counter;
+      map[element - state->element_map->storage] = counter;
     }
   }
 
@@ -1973,13 +1912,13 @@ static StitchState *stitch_init(bContext *C,
 
     BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
       UvElement *element = BM_uv_element_get(state->element_map, efa, l);
-      int offset1, itmp1 = element - state->element_map->buf;
-      int offset2,
-          itmp2 = BM_uv_element_get(state->element_map, efa, l->next) - state->element_map->buf;
+      int itmp1 = element - state->element_map->storage;
+      int itmp2 = BM_uv_element_get(state->element_map, efa, l->next) -
+                  state->element_map->storage;
       UvEdge *edge;
 
-      offset1 = map[itmp1];
-      offset2 = map[itmp2];
+      int offset1 = map[itmp1];
+      int offset2 = map[itmp2];
 
       all_edges[counter].next = NULL;
       all_edges[counter].first = NULL;
@@ -2020,7 +1959,7 @@ static StitchState *stitch_init(bContext *C,
   state->total_separate_edges = total_edges;
 
   /* fill the edges with data */
-  i = 0;
+  int i = 0;
   GHASH_ITER (gh_iter, edge_hash) {
     edges[i++] = *((UvEdge *)BLI_ghashIterator_getKey(&gh_iter));
   }
@@ -2099,13 +2038,13 @@ static StitchState *stitch_init(bContext *C,
         efa = BM_face_at_index(em->bm, faceIndex);
         element = BM_uv_element_get(
             state->element_map, efa, BM_iter_at_index(NULL, BM_LOOPS_OF_FACE, efa, elementIndex));
-        uv1 = map[element - state->element_map->buf];
+        uv1 = map[element - state->element_map->storage];
 
         element = BM_uv_element_get(
             state->element_map,
             efa,
             BM_iter_at_index(NULL, BM_LOOPS_OF_FACE, efa, (elementIndex + 1) % efa->len));
-        uv2 = map[element - state->element_map->buf];
+        uv2 = map[element - state->element_map->storage];
 
         if (uv1 < uv2) {
           tmp_edge.uv1 = uv1;
@@ -2170,8 +2109,8 @@ static StitchState *stitch_init(bContext *C,
   /***** initialize static island preview data *****/
 
   state->tris_per_island = MEM_mallocN(
-      sizeof(*state->tris_per_island) * state->element_map->totalIslands, "stitch island tris");
-  for (i = 0; i < state->element_map->totalIslands; i++) {
+      sizeof(*state->tris_per_island) * state->element_map->total_islands, "stitch island tris");
+  for (i = 0; i < state->element_map->total_islands; i++) {
     state->tris_per_island[i] = 0;
   }
 
@@ -2183,7 +2122,7 @@ static StitchState *stitch_init(bContext *C,
     }
   }
 
-  state->island_is_stitchable = MEM_callocN(sizeof(bool) * state->element_map->totalIslands,
+  state->island_is_stitchable = MEM_callocN(sizeof(bool) * state->element_map->total_islands,
                                             "stitch I stops");
   if (!state->island_is_stitchable) {
     state_delete(state);
@@ -2207,7 +2146,7 @@ static bool goto_next_island(StitchStateContainer *ssc)
 
   do {
     ssc->static_island++;
-    if (ssc->static_island >= active_state->element_map->totalIslands) {
+    if (ssc->static_island >= active_state->element_map->total_islands) {
       /* go to next object */
       ssc->active_object_index++;
       ssc->active_object_index %= ssc->objects_len;
@@ -2276,7 +2215,7 @@ static int stitch_init_all(bContext *C, wmOperator *op)
   View3D *v3d = CTX_wm_view3d(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
 
   if (objects_len == 0) {
     MEM_freeN(objects);
@@ -2357,7 +2296,7 @@ static int stitch_init_all(bContext *C, wmOperator *op)
   ssc->static_island = RNA_int_get(op->ptr, "static_island");
 
   StitchState *state = ssc->states[ssc->active_object_index];
-  ssc->static_island %= state->element_map->totalIslands;
+  ssc->static_island %= state->element_map->total_islands;
 
   /* If the initial active object doesn't have any stitchable islands
    * then no active island will be seen in the UI.
diff --git a/source/blender/editors/uvedit/uvedit_unwrap_ops.c b/source/blender/editors/uvedit/uvedit_unwrap_ops.c
index ae81aaffeb2..e66629f8fb0 100644
--- a/source/blender/editors/uvedit/uvedit_unwrap_ops.c
+++ b/source/blender/editors/uvedit/uvedit_unwrap_ops.c
@@ -798,7 +798,7 @@ static bool minimize_stretch_init(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   if (!uvedit_have_selection_multi(scene, objects, objects_len, &options)) {
     MEM_freeN(objects);
@@ -1116,7 +1116,7 @@ static int pack_islands_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   /* Early exit in case no UVs are selected. */
   if (!uvedit_have_selection_multi(scene, objects, objects_len, &options)) {
@@ -1191,7 +1191,7 @@ void UV_OT_pack_islands(wmOperatorType *ot)
 /** \name Average UV Islands Scale Operator
  * \{ */
 
-static int average_islands_scale_exec(bContext *C, wmOperator *UNUSED(op))
+static int average_islands_scale_exec(bContext *C, wmOperator *op)
 {
   const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
@@ -1208,15 +1208,19 @@ static int average_islands_scale_exec(bContext *C, wmOperator *UNUSED(op))
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   if (!uvedit_have_selection_multi(scene, objects, objects_len, &options)) {
     MEM_freeN(objects);
     return OPERATOR_CANCELLED;
   }
 
+  /* RNA props */
+  const bool scale_uv = RNA_boolean_get(op->ptr, "scale_uv");
+  const bool shear = RNA_boolean_get(op->ptr, "shear");
+
   ParamHandle *handle = construct_param_handle_multi(scene, objects, objects_len, &options);
-  GEO_uv_parametrizer_average(handle, false);
+  GEO_uv_parametrizer_average(handle, false, scale_uv, shear);
   GEO_uv_parametrizer_flush(handle);
   GEO_uv_parametrizer_delete(handle);
 
@@ -1247,6 +1251,10 @@ void UV_OT_average_islands_scale(wmOperatorType *ot)
   /* api callbacks */
   ot->exec = average_islands_scale_exec;
   ot->poll = ED_operator_uvedit;
+
+  /* properties */
+  RNA_def_boolean(ot->srna, "scale_uv", false, "Non-Uniform", "Scale U and V independently");
+  RNA_def_boolean(ot->srna, "shear", false, "Shear", "Reduce shear within islands");
 }
 
 /** \} */
@@ -1706,10 +1714,12 @@ static void uv_map_clip_correct_properties(wmOperatorType *ot)
  * such as "Unwrap" & "Smart UV Projections" will need to handle aspect correction themselves.
  * For now keep using a single aspect for all faces in this case.
  */
-static void uv_map_clip_correct_multi(Object **objects,
-                                      uint objects_len,
-                                      wmOperator *op,
-                                      bool per_face_aspect)
+static void uv_map_clip_correct(const Scene *scene,
+                                Object **objects,
+                                uint objects_len,
+                                wmOperator *op,
+                                bool per_face_aspect,
+                                bool only_selected_uvs)
 {
   BMFace *efa;
   BMLoop *l;
@@ -1746,6 +1756,10 @@ static void uv_map_clip_correct_multi(Object **objects,
           continue;
         }
 
+        if (only_selected_uvs && !uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+          continue;
+        }
+
         BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
           luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
           minmax_v2v2_v2(min, max, luv->uv);
@@ -1759,6 +1773,10 @@ static void uv_map_clip_correct_multi(Object **objects,
           continue;
         }
 
+        if (only_selected_uvs && !uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+          continue;
+        }
+
         BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
           luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
           clamp_v2(luv->uv, 0.0f, 1.0f);
@@ -1795,6 +1813,10 @@ static void uv_map_clip_correct_multi(Object **objects,
           continue;
         }
 
+        if (only_selected_uvs && !uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+          continue;
+        }
+
         BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
           luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 
@@ -1806,18 +1828,13 @@ static void uv_map_clip_correct_multi(Object **objects,
   }
 }
 
-static void uv_map_clip_correct(Object *ob, wmOperator *op)
-{
-  uv_map_clip_correct_multi(&ob, 1, op, true);
-}
-
 /** \} */
 
 /* -------------------------------------------------------------------- */
 /** \name UV Unwrap Operator
  * \{ */
 
-/* Assumes UV Map exists, doesn't run update funcs. */
+/* Assumes UV Map exists, doesn't run update functions. */
 static void uvedit_unwrap(const Scene *scene,
                           Object *obedit,
                           const UnwrapOptions *options,
@@ -1845,7 +1862,7 @@ static void uvedit_unwrap(const Scene *scene,
                                  result_info ? &result_info->count_failed : NULL);
   GEO_uv_parametrizer_lscm_end(handle);
 
-  GEO_uv_parametrizer_average(handle, true);
+  GEO_uv_parametrizer_average(handle, true, false, false);
 
   GEO_uv_parametrizer_flush(handle);
 
@@ -1903,11 +1920,11 @@ static int unwrap_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, CTX_wm_view3d(C), &objects_len);
+      scene, view_layer, CTX_wm_view3d(C), &objects_len);
 
   UnwrapOptions options = {
       .topology_from_uvs = false,
-      .only_selected_faces = false,
+      .only_selected_faces = true,
       .only_selected_uvs = false,
       .fill_holes = RNA_boolean_get(op->ptr, "fill_holes"),
       .correct_aspect = RNA_boolean_get(op->ptr, "correct_aspect"),
@@ -1918,7 +1935,6 @@ static int unwrap_exec(bContext *C, wmOperator *op)
   if (CTX_wm_space_image(C)) {
     /* Inside the UV Editor, only unwrap selected UVs. */
     options.only_selected_uvs = true;
-    options.only_selected_faces = true;
     options.pin_unselected = true;
   }
 
@@ -2238,6 +2254,12 @@ static int smart_project_exec(bContext *C, wmOperator *op)
   /* May be NULL. */
   View3D *v3d = CTX_wm_view3d(C);
 
+  bool only_selected_uvs = false;
+  if (CTX_wm_space_image(C)) {
+    /* Inside the UV Editor, only project selected UVs. */
+    only_selected_uvs = true;
+  }
+
   const float project_angle_limit = RNA_float_get(op->ptr, "angle_limit");
   const float island_margin = RNA_float_get(op->ptr, "island_margin");
   const float area_weight = RNA_float_get(op->ptr, "area_weight");
@@ -2250,7 +2272,7 @@ static int smart_project_exec(bContext *C, wmOperator *op)
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
 
   Object **objects_changed = MEM_mallocN(sizeof(*objects_changed) * objects_len, __func__);
   uint object_changed_len = 0;
@@ -2268,7 +2290,8 @@ static int smart_project_exec(bContext *C, wmOperator *op)
       continue;
     }
 
-    const uint cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+    const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+    BLI_assert(cd_loop_uv_offset >= 0);
     ThickFace *thick_faces = MEM_mallocN(sizeof(*thick_faces) * em->bm->totface, __func__);
 
     uint thick_faces_len = 0;
@@ -2276,6 +2299,14 @@ static int smart_project_exec(bContext *C, wmOperator *op)
       if (!BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
         continue;
       }
+
+      if (only_selected_uvs) {
+        if (!uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+          uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
+          continue;
+        }
+      }
+
       thick_faces[thick_faces_len].area = BM_face_calc_area(efa);
       thick_faces[thick_faces_len].efa = efa;
       thick_faces_len++;
@@ -2390,6 +2421,7 @@ static int smart_project_exec(bContext *C, wmOperator *op)
                                      .rotate = true,
                                      /* We could make this optional. */
                                      .rotate_align_axis = 1,
+                                     .only_selected_uvs = true,
                                      .only_selected_faces = true,
                                      .correct_aspect = correct_aspect,
                                      .use_seams = true,
@@ -2397,7 +2429,8 @@ static int smart_project_exec(bContext *C, wmOperator *op)
 
     /* #ED_uvedit_pack_islands_multi only supports `per_face_aspect = false`. */
     const bool per_face_aspect = false;
-    uv_map_clip_correct_multi(objects_changed, object_changed_len, op, per_face_aspect);
+    uv_map_clip_correct(
+        scene, objects_changed, object_changed_len, op, per_face_aspect, only_selected_uvs);
   }
 
   MEM_freeN(objects_changed);
@@ -2504,7 +2537,7 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
   /* NOTE: objects that aren't touched are set to NULL (to skip clipping). */
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
 
   if (use_orthographic) {
     /* Calculate average object position. */
@@ -2599,7 +2632,9 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
   }
 
   if (changed_multi) {
-    uv_map_clip_correct_multi(objects, objects_len, op, true);
+    const bool per_face_aspect = true;
+    const bool only_selected_uvs = false;
+    uv_map_clip_correct(scene, objects, objects_len, op, per_face_aspect, only_selected_uvs);
   }
 
   MEM_freeN(objects);
@@ -2653,12 +2688,13 @@ void UV_OT_project_from_view(wmOperatorType *ot)
 
 static int reset_exec(bContext *C, wmOperator *UNUSED(op))
 {
+  const Scene *scene = CTX_data_scene(C);
   ViewLayer *view_layer = CTX_data_view_layer(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     Mesh *me = (Mesh *)obedit->data;
@@ -2759,10 +2795,16 @@ static int sphere_project_exec(bContext *C, wmOperator *op)
   const Scene *scene = CTX_data_scene(C);
   View3D *v3d = CTX_wm_view3d(C);
 
+  bool only_selected_uvs = false;
+  if (CTX_wm_space_image(C)) {
+    /* Inside the UV Editor, only project selected UVs. */
+    only_selected_uvs = true;
+  }
+
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2791,6 +2833,13 @@ static int sphere_project_exec(bContext *C, wmOperator *op)
         continue;
       }
 
+      if (only_selected_uvs) {
+        if (!uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+          uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
+          continue;
+        }
+      }
+
       BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
         luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 
@@ -2800,7 +2849,8 @@ static int sphere_project_exec(bContext *C, wmOperator *op)
       uv_map_mirror(em, efa);
     }
 
-    uv_map_clip_correct(obedit, op);
+    const bool per_face_aspect = true;
+    uv_map_clip_correct(scene, &obedit, 1, op, per_face_aspect, only_selected_uvs);
 
     DEG_id_tag_update(obedit->data, ID_RECALC_GEOMETRY);
     WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
@@ -2857,10 +2907,16 @@ static int cylinder_project_exec(bContext *C, wmOperator *op)
   const Scene *scene = CTX_data_scene(C);
   View3D *v3d = CTX_wm_view3d(C);
 
+  bool only_selected_uvs = false;
+  if (CTX_wm_space_image(C)) {
+    /* Inside the UV Editor, only project selected UVs. */
+    only_selected_uvs = true;
+  }
+
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -2889,16 +2945,21 @@ static int cylinder_project_exec(bContext *C, wmOperator *op)
         continue;
       }
 
+      if (only_selected_uvs && !uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+        uvedit_face_select_disable(scene, em->bm, efa, cd_loop_uv_offset);
+        continue;
+      }
+
       BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
         luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-
         uv_cylinder_project(luv->uv, l->v->co, center, rotmat);
       }
 
       uv_map_mirror(em, efa);
     }
 
-    uv_map_clip_correct(obedit, op);
+    const bool per_face_aspect = true;
+    uv_map_clip_correct(scene, &obedit, 1, op, per_face_aspect, only_selected_uvs);
 
     DEG_id_tag_update(obedit->data, ID_RECALC_GEOMETRY);
     WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
@@ -2932,9 +2993,11 @@ void UV_OT_cylinder_project(wmOperatorType *ot)
 /** \name Cube UV Project Operator
  * \{ */
 
-static void uvedit_unwrap_cube_project(BMesh *bm,
+static void uvedit_unwrap_cube_project(const Scene *scene,
+                                       BMesh *bm,
                                        float cube_size,
-                                       bool use_select,
+                                       const bool use_select,
+                                       const bool only_selected_uvs,
                                        const float center[3])
 {
   BMFace *efa;
@@ -2966,6 +3029,10 @@ static void uvedit_unwrap_cube_project(BMesh *bm,
     if (use_select && !BM_elem_flag_test(efa, BM_ELEM_SELECT)) {
       continue;
     }
+    if (only_selected_uvs && !uvedit_face_select_test(scene, efa, cd_loop_uv_offset)) {
+      uvedit_face_select_disable(scene, bm, efa, cd_loop_uv_offset);
+      continue;
+    }
 
     axis_dominant_v3(&cox, &coy, efa->no);
 
@@ -2982,13 +3049,19 @@ static int cube_project_exec(bContext *C, wmOperator *op)
   const Scene *scene = CTX_data_scene(C);
   View3D *v3d = CTX_wm_view3d(C);
 
+  bool only_selected_uvs = false;
+  if (CTX_wm_space_image(C)) {
+    /* Inside the UV Editor, only cube project selected UVs. */
+    only_selected_uvs = true;
+  }
+
   PropertyRNA *prop_cube_size = RNA_struct_find_property(op->ptr, "cube_size");
   const float cube_size_init = RNA_property_float_get(op->ptr, prop_cube_size);
 
   ViewLayer *view_layer = CTX_data_view_layer(C);
   uint objects_len = 0;
   Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
-      view_layer, v3d, &objects_len);
+      scene, view_layer, v3d, &objects_len);
   for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
     Object *obedit = objects[ob_index];
     BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -3024,9 +3097,10 @@ static int cube_project_exec(bContext *C, wmOperator *op)
       }
     }
 
-    uvedit_unwrap_cube_project(em->bm, cube_size, true, center);
+    uvedit_unwrap_cube_project(scene, em->bm, cube_size, true, only_selected_uvs, center);
 
-    uv_map_clip_correct(obedit, op);
+    const bool per_face_aspect = true;
+    uv_map_clip_correct(scene, &obedit, 1, op, per_face_aspect, only_selected_uvs);
 
     DEG_id_tag_update(obedit->data, ID_RECALC_GEOMETRY);
     WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
@@ -3093,7 +3167,7 @@ void ED_uvedit_add_simple_uvs(Main *bmain, const Scene *scene, Object *ob)
   /* select all uv loops first - pack parameters needs this to make sure charts are registered */
   ED_uvedit_select_all(bm);
   /* A cube size of 2.0 maps [-1..1] vertex coords to [0.0..1.0] in UV coords. */
-  uvedit_unwrap_cube_project(bm, 2.0, false, NULL);
+  uvedit_unwrap_cube_project(scene, bm, 2.0, false, false, NULL);
   /* Set the margin really quickly before the packing operation. */
   scene->toolsettings->uvcalc_margin = 0.001f;
   uvedit_pack_islands(scene, ob, bm);