Multi-Object Editing

This adds initial multi-object editing support.

- Selected objects are used when entering edit & pose modes.
- Selection & tools work on all objects however many tools need porting
  See: T54641 for remaining tasks.

Indentation will be done separately.

See patch: D3101

4 files changed, 475 insertions, 117 deletions

diff --git a/source/blender/editors/uvedit/uvedit_draw.c b/source/blender/editors/uvedit/uvedit_draw.c
index 3fcc89d0973..328ab3f1a8d 100644
--- a/source/blender/editors/uvedit/uvedit_draw.c
+++ b/source/blender/editors/uvedit/uvedit_draw.c
@@ -51,6 +51,7 @@
 #include "BKE_DerivedMesh.h"
 #include "BKE_editmesh.h"
 #include "BKE_material.h"
+#include "BKE_layer.h"
 
 #include "BKE_scene.h"
 
@@ -1100,12 +1101,21 @@ void ED_uvedit_draw_main(
 	draw_uv_shadows_get(sima, obact, obedit, &show_uvshadow, &show_texpaint_uvshadow);
 
 	if (show_uvedit || show_uvshadow || show_texpaint_uvshadow) {
-		if (show_uvshadow)
+		if (show_uvshadow) {
 			draw_uvs_shadow(obedit);
-		else if (show_uvedit)
-			draw_uvs(sima, scene, view_layer, obedit, depsgraph);
-		else
+		}
+		else if (show_uvedit) {
+			uint objects_len = 0;
+			Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
+			for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+				Object *ob_iter = objects[ob_index];
+				draw_uvs(sima, scene, view_layer, ob_iter, depsgraph);
+			}
+			MEM_SAFE_FREE(objects);
+		}
+		else {
 			draw_uvs_texpaint(sima, scene, view_layer, obact);
+		}
 
 		if (show_uvedit && !(toolsettings->use_uv_sculpt))
 			ED_image_draw_cursor(ar, sima->cursor);
diff --git a/source/blender/editors/uvedit/uvedit_intern.h b/source/blender/editors/uvedit/uvedit_intern.h
index c5f16d6fb14..e3db0162f10 100644
--- a/source/blender/editors/uvedit/uvedit_intern.h
+++ b/source/blender/editors/uvedit/uvedit_intern.h
@@ -51,6 +51,8 @@ void  uv_poly_center(struct BMFace *f, float r_cent[2], const int cd_loop_uv_off
 /* find nearest */
 
 typedef struct UvNearestHit {
+	/** Only for `*_multi(..)` versions of functions. */
+	struct Object *ob;
 	/** Always set if we have a hit. */
 	struct BMFace *efa;
 	struct BMLoop *l;
@@ -66,14 +68,23 @@ typedef struct UvNearestHit {
 bool uv_find_nearest_vert(
         struct Scene *scene, struct Image *ima, struct Object *obedit,
         const float co[2], const float penalty_dist, struct UvNearestHit *hit_final);
+bool uv_find_nearest_vert_multi(
+        struct Scene *scene, struct Image *ima, struct Object **objects, const uint objects_len,
+        const float co[2], const float penalty_dist, struct UvNearestHit *hit_final);
 
 bool uv_find_nearest_edge(
         struct Scene *scene, struct Image *ima, struct Object *obedit,
         const float co[2], struct UvNearestHit *hit_final);
+bool uv_find_nearest_edge_multi(
+        struct Scene *scene, struct Image *ima, struct Object **objects, const uint objects_len,
+        const float co[2], struct UvNearestHit *hit_final);
 
 bool uv_find_nearest_face(
         struct Scene *scene, struct Image *ima, struct Object *obedit,
         const float co[2], struct UvNearestHit *hit_final);
+bool uv_find_nearest_face_multi(
+        struct Scene *scene, struct Image *ima, struct Object **objects, const uint objects_len,
+        const float co[2], struct UvNearestHit *hit_final);
 
 /* utility tool functions */
 
diff --git a/source/blender/editors/uvedit/uvedit_ops.c b/source/blender/editors/uvedit/uvedit_ops.c
index 9df0c7c89ed..c2e8c2b5786 100644
--- a/source/blender/editors/uvedit/uvedit_ops.c
+++ b/source/blender/editors/uvedit/uvedit_ops.c
@@ -66,6 +66,7 @@
 #include "BKE_report.h"
 #include "BKE_scene.h"
 #include "BKE_editmesh.h"
+#include "BKE_layer.h"
 
 #include "DEG_depsgraph.h"
 
@@ -89,7 +90,10 @@
 
 #include "uvedit_intern.h"
 
-static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, BMEditMesh *em, int action);
+static bool uv_select_is_any_selected(Scene *scene, Image *ima, Object *obedit);
+static bool uv_select_is_any_selected_multi(Scene *scene, Image *ima, Object **objects, const uint objects_len);
+static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, int action);
+static void uv_select_all_perform_multi(Scene *scene, Image *ima, Object **objects, const uint objects_len, int action);
 static void uv_select_flush_from_tag_face(SpaceImage *sima, Scene *scene, Object *obedit, const bool select);
 static void uv_select_flush_from_tag_loop(SpaceImage *sima, Scene *scene, Object *obedit, const bool select);
 
@@ -794,6 +798,21 @@ bool uv_find_nearest_edge(
 	return found;
 }
 
+bool uv_find_nearest_edge_multi(
+        Scene *scene, Image *ima, Object **objects, const uint objects_len,
+        const float co[2], UvNearestHit *hit_final)
+{
+	bool found = false;
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		if (uv_find_nearest_edge(scene, ima, obedit, co, hit_final)) {
+			hit_final->ob = obedit;
+			found = true;
+		}
+	}
+	return found;
+}
+
 bool uv_find_nearest_face(
         Scene *scene, Image *ima, Object *obedit, const float co[2],
         UvNearestHit *hit_final)
@@ -837,6 +856,21 @@ bool uv_find_nearest_face(
 	return found;
 }
 
+bool uv_find_nearest_face_multi(
+        Scene *scene, Image *ima, Object **objects, const uint objects_len,
+        const float co[2], UvNearestHit *hit_final)
+{
+	bool found = false;
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		if (uv_find_nearest_face(scene, ima, obedit, co, hit_final)) {
+			hit_final->ob = obedit;
+			found = true;
+		}
+	}
+	return found;
+}
+
 static bool uv_nearest_between(
         const BMLoop *l, const float co[2],
         const int cd_loop_uv_offset)
@@ -918,6 +952,21 @@ bool uv_find_nearest_vert(
 	return found;
 }
 
+bool uv_find_nearest_vert_multi(
+        Scene *scene, Image *ima, Object **objects, const uint objects_len,
+        float const co[2], const float penalty_dist, UvNearestHit *hit_final)
+{
+	bool found = false;
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		if (uv_find_nearest_vert(scene, ima, obedit, co, penalty_dist, hit_final)) {
+			hit_final->ob = obedit;
+			found = true;
+		}
+	}
+	return found;
+}
+
 bool ED_uvedit_nearest_uv(Scene *scene, Object *obedit, Image *ima, const float co[2], float r_uv[2])
 {
 	BMEditMesh *em = BKE_editmesh_from_object(obedit);
@@ -1043,9 +1092,10 @@ static bool uv_select_edgeloop_edge_tag_faces(BMEditMesh *em, UvMapVert *first1,
 }
 
 static int uv_select_edgeloop(
-        Scene *scene, Image *ima, Object *obedit, BMEditMesh *em, UvNearestHit *hit,
+        Scene *scene, Image *ima, Object *obedit, UvNearestHit *hit,
         const float limit[2], const bool extend)
 {
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	BMFace *efa;
 	BMIter iter, liter;
 	BMLoop *l;
@@ -1064,7 +1114,7 @@ static int uv_select_edgeloop(
 	BM_mesh_elem_index_ensure(em->bm, BM_VERT | BM_FACE);
 
 	if (!extend) {
-		uv_select_all_perform(scene, ima, obedit, em, SEL_DESELECT);
+		uv_select_all_perform(scene, ima, obedit, SEL_DESELECT);
 	}
 
 	BM_mesh_elem_hflag_disable_all(em->bm, BM_FACE, BM_ELEM_TAG, false);
@@ -1147,10 +1197,17 @@ static int uv_select_edgeloop(
 /** \name Select Linked
  * \{ */
 
-static void uv_select_linked(
-        Scene *scene, Image *ima, Object *obedit, BMEditMesh *em, const float limit[2],
+static void uv_select_linked_multi(
+        Scene *scene, Image *ima, Object **objects, const uint objects_len, const float limit[2],
         UvNearestHit *hit_final, bool extend, bool select_faces)
 {
+	/* loop over objects, or just use hit_final->ob */
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+	if (hit_final && ob_index != 0) {
+		break;
+	}
+	Object *obedit = hit_final ? hit_final->ob : objects[ob_index];
+
 	BMFace *efa;
 	BMLoop *l;
 	BMIter iter, liter;
@@ -1161,6 +1218,7 @@ static void uv_select_linked(
 	unsigned int a;
 	char *flag;
 
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
 
 	BM_mesh_elem_table_ensure(em->bm, BM_FACE); /* we can use this too */
@@ -1336,6 +1394,7 @@ static void uv_select_linked(
 	MEM_freeN(stack);
 	MEM_freeN(flag);
 	BM_uv_vert_map_free(vmap);
+	}
 }
 
 /* WATCH IT: this returns first selected UV,
@@ -1957,9 +2016,53 @@ static void UV_OT_weld(wmOperatorType *ot)
 /** \name (De)Select All Operator
  * \{ */
 
-static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, BMEditMesh *em, int action)
+
+static bool uv_select_is_any_selected(Scene *scene, Image *ima, Object *obedit)
 {
 	ToolSettings *ts = scene->toolsettings;
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+	BMFace *efa;
+	BMLoop *l;
+	BMIter iter, liter;
+	MLoopUV *luv;
+
+	if (ts->uv_flag & UV_SYNC_SELECTION) {
+		return (em->bm->totvertsel || em->bm->totedgesel || em->bm->totfacesel);
+	}
+	else {
+		const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+		BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
+			if (!uvedit_face_visible_test(scene, obedit, ima, efa)) {
+				continue;
+			}
+			BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+				luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
+				if (luv->flag & MLOOPUV_VERTSEL) {
+					return true;
+				}
+			}
+		}
+	}
+	return false;
+}
+
+static bool uv_select_is_any_selected_multi(Scene *scene, Image *ima, Object **objects, const uint objects_len)
+{
+	bool found = false;
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		if (uv_select_is_any_selected(scene, ima, obedit)) {
+			found = true;
+			break;
+		}
+	}
+	return found;
+}
+
+static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, int action)
+{
+	ToolSettings *ts = scene->toolsettings;
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	BMFace *efa;
 	BMLoop *l;
 	BMIter iter, liter;
@@ -1967,8 +2070,11 @@ static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, BMEd
 
 	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
 
-	if (ts->uv_flag & UV_SYNC_SELECTION) {
+	if (action == SEL_TOGGLE) {
+		action = uv_select_is_any_selected(scene, ima, obedit) ? SEL_DESELECT : SEL_SELECT;
+	}
 
+	if (ts->uv_flag & UV_SYNC_SELECTION) {
 		switch (action) {
 			case SEL_TOGGLE:
 				EDBM_select_toggle_all(em);
@@ -1986,24 +2092,6 @@ static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, BMEd
 		}
 	}
 	else {
-		if (action == SEL_TOGGLE) {
-			action = SEL_SELECT;
-			BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
-				if (!uvedit_face_visible_test(scene, obedit, ima, efa))
-					continue;
-
-				BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
-					luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
-
-					if (luv->flag & MLOOPUV_VERTSEL) {
-						action = SEL_DESELECT;
-						break;
-					}
-				}
-			}
-		}
-	
-		
 		BM_ITER_MESH (efa, &iter, em->bm, BM_FACES_OF_MESH) {
 			if (!uvedit_face_visible_test(scene, obedit, ima, efa))
 				continue;
@@ -2027,18 +2115,38 @@ static void uv_select_all_perform(Scene *scene, Image *ima, Object *obedit, BMEd
 	}
 }
 
+static void uv_select_all_perform_multi(
+        Scene *scene, Image *ima, Object **objects, const uint objects_len, int action)
+{
+	if (action == SEL_TOGGLE) {
+		action = uv_select_is_any_selected_multi(scene, ima, objects, objects_len) ? SEL_DESELECT : SEL_SELECT;
+	}
+
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		uv_select_all_perform(scene, ima, obedit, action);
+	}
+}
+
 static int uv_select_all_exec(bContext *C, wmOperator *op)
 {
 	Scene *scene = CTX_data_scene(C);
-	Object *obedit = CTX_data_edit_object(C);
 	Image *ima = CTX_data_edit_image(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 
 	int action = RNA_enum_get(op->ptr, "action");
 
-	uv_select_all_perform(scene, ima, obedit, em, action);
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
 
-	WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
+	uv_select_all_perform_multi(scene, ima, objects, objects_len, action);
+
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
+	}
+
+	MEM_SAFE_FREE(objects);
 
 	return OPERATOR_FINISHED;
 }
@@ -2087,14 +2195,14 @@ static bool uv_sticky_select(float *limit, int hitv[], int v, float *hituv[], fl
 	return false;
 }
 
-static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loop)
+static int uv_mouse_select_multi(
+        bContext *C, Object **objects, uint objects_len,
+        const float co[2], bool extend, bool loop)
 {
 	SpaceImage *sima = CTX_wm_space_image(C);
 	Scene *scene = CTX_data_scene(C);
 	ToolSettings *ts = scene->toolsettings;
-	Object *obedit = CTX_data_edit_object(C);
 	Image *ima = CTX_data_edit_image(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	BMFace *efa;
 	BMLoop *l;
 	BMIter iter, liter;
@@ -2105,8 +2213,6 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	int flush = 0, hitlen = 0; /* 0 == don't flush, 1 == sel, -1 == desel;  only use when selection sync is enabled */
 	float limit[2], **hituv = NULL;
 
-	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
-
 	/* notice 'limit' is the same no matter the zoom level, since this is like
 	 * remove doubles and could annoying if it joined points when zoomed out.
 	 * 'penalty' is in screen pixel space otherwise zooming in on a uv-vert and
@@ -2143,7 +2249,7 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	/* find nearest element */
 	if (loop) {
 		/* find edge */
-		if (!uv_find_nearest_edge(scene, ima, obedit, co, &hit)) {
+		if (!uv_find_nearest_edge_multi(scene, ima, objects, objects_len, co, &hit)) {
 			return OPERATOR_CANCELLED;
 		}
 
@@ -2151,7 +2257,7 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	}
 	else if (selectmode == UV_SELECT_VERTEX) {
 		/* find vertex */
-		if (!uv_find_nearest_vert(scene, ima, obedit, co, penalty_dist, &hit)) {
+		if (!uv_find_nearest_vert_multi(scene, ima, objects, objects_len, co, penalty_dist, &hit)) {
 			return OPERATOR_CANCELLED;
 		}
 
@@ -2167,7 +2273,7 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	}
 	else if (selectmode == UV_SELECT_EDGE) {
 		/* find edge */
-		if (!uv_find_nearest_edge(scene, ima, obedit, co, &hit)) {
+		if (!uv_find_nearest_edge_multi(scene, ima, objects, objects_len, co, &hit)) {
 			return OPERATOR_CANCELLED;
 		}
 
@@ -2185,10 +2291,13 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	}
 	else if (selectmode == UV_SELECT_FACE) {
 		/* find face */
-		if (!uv_find_nearest_face(scene, ima, obedit, co, &hit)) {
+		if (!uv_find_nearest_face_multi(scene, ima, objects, objects_len, co, &hit)) {
 			return OPERATOR_CANCELLED;
 		}
 
+		BMEditMesh *em = BKE_editmesh_from_object(hit.ob);
+		const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+
 		/* make active */
 		BM_mesh_active_face_set(em->bm, hit.efa);
 
@@ -2205,7 +2314,7 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 		hitlen = hit.efa->len;
 	}
 	else if (selectmode == UV_SELECT_ISLAND) {
-		if (!uv_find_nearest_edge(scene, ima, obedit, co, &hit)) {
+		if (!uv_find_nearest_edge_multi(scene, ima, objects, objects_len, co, &hit)) {
 			return OPERATOR_CANCELLED;
 		}
 
@@ -2216,12 +2325,24 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 		return OPERATOR_CANCELLED;
 	}
 
+	Object *obedit = hit.ob;
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+	const int cd_loop_uv_offset = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+
 	/* do selection */
 	if (loop) {
-		flush = uv_select_edgeloop(scene, ima, obedit, em, &hit, limit, extend);
+		if (!extend) {
+			/* TODO(MULTI_EDIT): We only need to de-select non-active */
+			uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
+		}
+		flush = uv_select_edgeloop(scene, ima, obedit, &hit, limit, extend);
 	}
 	else if (selectmode == UV_SELECT_ISLAND) {
-		uv_select_linked(scene, ima, obedit, em, limit, &hit, extend, false);
+		if (!extend) {
+			/* TODO(MULTI_EDIT): We only need to de-select non-active */
+			uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
+		}
+		uv_select_linked_multi(scene, ima, objects, objects_len, limit, &hit, extend, false);
 	}
 	else if (extend) {
 		if (selectmode == UV_SELECT_VERTEX) {
@@ -2271,7 +2392,7 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 	}
 	else {
 		/* deselect all */
-		uv_select_all_perform(scene, ima, obedit, em, SEL_DESELECT);
+		uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
 
 		if (selectmode == UV_SELECT_VERTEX) {
 			/* select vertex */
@@ -2339,6 +2460,15 @@ static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loo
 
 	return OPERATOR_PASS_THROUGH | OPERATOR_FINISHED;
 }
+static int uv_mouse_select(bContext *C, const float co[2], bool extend, bool loop)
+{
+	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, &objects_len);
+	int ret = uv_mouse_select_multi(C, objects, objects_len, co, extend, loop);
+	MEM_freeN(objects);
+	return ret;
+}
 
 static int uv_select_exec(bContext *C, wmOperator *op)
 {
@@ -2443,9 +2573,8 @@ static int uv_select_linked_internal(bContext *C, wmOperator *op, const wmEvent
 	SpaceImage *sima = CTX_wm_space_image(C);
 	Scene *scene = CTX_data_scene(C);
 	ToolSettings *ts = scene->toolsettings;
-	Object *obedit = CTX_data_edit_object(C);
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	Image *ima = CTX_data_edit_image(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	float limit[2];
 	int extend;
 	bool select_faces = (ts->uv_flag & UV_SYNC_SELECTION) && (ts->selectmode & SCE_SELECT_FACE);
@@ -2460,6 +2589,9 @@ static int uv_select_linked_internal(bContext *C, wmOperator *op, const wmEvent
 	extend = RNA_boolean_get(op->ptr, "extend");
 	uvedit_pixel_to_float(sima, limit, 0.05f);
 
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
+
 	if (pick) {
 		float co[2];
 
@@ -2475,15 +2607,32 @@ static int uv_select_linked_internal(bContext *C, wmOperator *op, const wmEvent
 			RNA_float_get_array(op->ptr, "location", co);
 		}
 
-		if (!uv_find_nearest_edge(scene, ima, obedit, co, &hit)) {
+		if (!uv_find_nearest_edge_multi(scene, ima, objects, objects_len, co, &hit)) {
+			MEM_SAFE_FREE(objects);
 			return OPERATOR_CANCELLED;
 		}
 	}
 
-	uv_select_linked(scene, ima, obedit, em, limit, pick ? &hit : NULL, extend, select_faces);
+	if (!extend) {
+		uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
+	}
 
-	DEG_id_tag_update(obedit->data, 0);
-	WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
+	uv_select_linked_multi(scene, ima, objects, objects_len, limit, pick ? &hit : NULL, extend, select_faces);
+
+	/* weak!, but works */
+	Object **objects_free = objects;
+	if (pick) {
+		objects = &hit.ob;
+		objects_len = 1;
+	}
+
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		DEG_id_tag_update(obedit->data, 0);
+		WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
+	}
+
+	MEM_SAFE_FREE(objects_free);
 
 	return OPERATOR_FINISHED;
 }
@@ -2879,23 +3028,20 @@ static int uv_border_select_exec(bContext *C, wmOperator *op)
 	SpaceImage *sima = CTX_wm_space_image(C);
 	Scene *scene = CTX_data_scene(C);
 	ToolSettings *ts = scene->toolsettings;
-	Object *obedit = CTX_data_edit_object(C);
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	Image *ima = CTX_data_edit_image(C);
 	ARegion *ar = CTX_wm_region(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	BMFace *efa;
 	BMLoop *l;
 	BMIter iter, liter;
 	MLoopUV *luv;
 	rctf rectf;
-	bool changed, pinned, select, extend;
+	bool pinned, select, extend;
 	const bool use_face_center = (
 	        (ts->uv_flag & UV_SYNC_SELECTION) ?
 	        (ts->selectmode == SCE_SELECT_FACE) :
 	        (ts->uv_selectmode == UV_SELECT_FACE));
 
-	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
-
 	/* get rectangle from operator */
 	WM_operator_properties_border_to_rctf(op, &rectf);
 	UI_view2d_region_to_view_rctf(&ar->v2d, &rectf, &rectf);
@@ -2905,8 +3051,22 @@ static int uv_border_select_exec(bContext *C, wmOperator *op)
 	extend = RNA_boolean_get(op->ptr, "extend");
 	pinned = RNA_boolean_get(op->ptr, "pinned");
 
+	bool changed_multi = false;
+
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
+
+	/* don't indent to avoid diff noise! */
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+	Object *obedit = objects[ob_index];
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+
+	bool changed = false;
+
+	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+
 	if (!extend)
-		uv_select_all_perform(scene, ima, obedit, em, SEL_DESELECT);
+		uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
 
 	/* do actual selection */
 	if (use_face_center && !pinned) {
@@ -2972,12 +3132,17 @@ static int uv_border_select_exec(bContext *C, wmOperator *op)
 		if (ts->uv_flag & UV_SYNC_SELECTION) {
 			WM_event_add_notifier(C, NC_GEOM | ND_SELECT, obedit->data);
 		}
-		
-		return OPERATOR_FINISHED;
+	}
+	changed_multi |= changed;
 	}
 
+	MEM_SAFE_FREE(objects);
+
+	if (changed_multi) {
+		return OPERATOR_FINISHED;
+	}
 	return OPERATOR_CANCELLED;
-} 
+}
 
 static void UV_OT_select_border(wmOperatorType *ot)
 {
@@ -3131,36 +3296,46 @@ static void UV_OT_circle_select(wmOperatorType *ot)
 /** \name Lasso Select Operator
  * \{ */
 
-static bool do_lasso_select_mesh_uv(
-        bContext *C, const int mcords[][2], short moves,
-        const bool select, const bool extend)
+static bool do_lasso_select_mesh_uv(bContext *C, const int mcords[][2], short moves,
+                                    const bool select, const bool extend)
 {
 	SpaceImage *sima = CTX_wm_space_image(C);
 	Image *ima = CTX_data_edit_image(C);
 	ARegion *ar = CTX_wm_region(C);
-	Object *obedit = CTX_data_edit_object(C);
 	Scene *scene = CTX_data_scene(C);
 	ToolSettings *ts = scene->toolsettings;
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	const bool use_face_center = (
 	        (ts->uv_flag & UV_SYNC_SELECTION) ?
 	        (ts->selectmode == SCE_SELECT_FACE) :
 	        (ts->uv_selectmode == UV_SELECT_FACE));
 
-	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
 
 	BMIter iter, liter;
 
 	BMFace *efa;
 	BMLoop *l;
 	int screen_uv[2];
-	bool changed = false;
+	bool changed_multi = false;
 	rcti rect;
 
 	BLI_lasso_boundbox(&rect, mcords, moves);
 
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
+
+	/* don't indent to avoid diff noise! */
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+	Object *obedit = objects[ob_index];
+
+	bool changed = false;
+
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+
+	const int cd_loop_uv_offset  = CustomData_get_offset(&em->bm->ldata, CD_MLOOPUV);
+
 	if (!extend && select) {
-		uv_select_all_perform(scene, ima, obedit, em, SEL_DESELECT);
+		uv_select_all_perform_multi(scene, ima, objects, objects_len, SEL_DESELECT);
 	}
 
 	if (use_face_center) { /* Face Center Sel */
@@ -3223,7 +3398,10 @@ static bool do_lasso_select_mesh_uv(
 		}
 	}
 
-	return changed;
+	changed_multi |= changed;
+	}
+
+	return changed_multi;
 }
 
 static int uv_lasso_select_exec(bContext *C, wmOperator *op)
@@ -4175,7 +4353,7 @@ static int uv_mark_seam_exec(bContext *C, wmOperator *op)
 	me->drawflag |= ME_DRAWSEAMS;
 
 	if (scene->toolsettings->edge_mode_live_unwrap)
-		ED_unwrap_lscm(scene, ob, false);
+		ED_unwrap_lscm(scene, ob, false, false);
 
 	DEG_id_tag_update(&me->id, 0);
 	WM_event_add_notifier(C, NC_GEOM | ND_DATA, me);
diff --git a/source/blender/editors/uvedit/uvedit_unwrap_ops.c b/source/blender/editors/uvedit/uvedit_unwrap_ops.c
index 4f28d1f9eea..0e5f4886f3e 100644
--- a/source/blender/editors/uvedit/uvedit_unwrap_ops.c
+++ b/source/blender/editors/uvedit/uvedit_unwrap_ops.c
@@ -61,6 +61,7 @@
 #include "BKE_report.h"
 #include "BKE_scene.h"
 #include "BKE_editmesh.h"
+#include "BKE_layer.h"
 
 #include "DEG_depsgraph.h"
 
@@ -202,6 +203,21 @@ static bool uvedit_have_selection(Scene *scene, BMEditMesh *em, bool implicit)
 	return false;
 }
 
+static bool uvedit_have_selection_multi(
+        Scene *scene, Object **objects, const uint objects_len, bool implicit)
+{
+	bool have_select = false;
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		BMEditMesh *em = BKE_editmesh_from_object(obedit);
+		if (uvedit_have_selection(scene, em, implicit)) {
+			have_select = true;
+			break;
+		}
+	}
+	return have_select;
+}
+
 void ED_uvedit_get_aspect(Scene *scene, Object *ob, BMesh *bm, float *aspx, float *aspy)
 {
 	bool sloppy = true;
@@ -258,9 +274,11 @@ static void construct_param_handle_face_add(ParamHandle *handle, Scene *scene,
 	param_face_add(handle, key, i, vkeys, co, uv, pin, select, efa->no);
 }
 
-static ParamHandle *construct_param_handle(Scene *scene, Object *ob, BMesh *bm,
-                                           const bool implicit, const bool fill, const bool sel,
-                                           const bool correct_aspect)
+/* See: construct_param_handle_multi to handle multiple objects at once. */
+static ParamHandle *construct_param_handle(
+        Scene *scene, Object *ob, BMesh *bm,
+        const bool implicit, const bool fill, const bool sel,
+        const bool correct_aspect)
 {
 	ParamHandle *handle;
 	BMFace *efa;
@@ -324,6 +342,89 @@ static ParamHandle *construct_param_handle(Scene *scene, Object *ob, BMesh *bm,
 	return handle;
 }
 
+/**
+ * Version of #construct_param_handle_single that handles multiple objects.
+ */
+static ParamHandle *construct_param_handle_multi(
+        Scene *scene, Object **objects, const uint objects_len,
+        const bool implicit, const bool fill, const bool sel,
+        const bool correct_aspect)
+{
+	ParamHandle *handle;
+	BMFace *efa;
+	BMLoop *l;
+	BMEdge *eed;
+	BMIter iter, liter;
+	int i;
+
+
+	handle = param_construct_begin();
+
+	if (correct_aspect) {
+		Object *ob = objects[0];
+		BMEditMesh *em = BKE_editmesh_from_object(ob);
+		BMesh *bm = em->bm;
+		float aspx, aspy;
+
+		ED_uvedit_get_aspect(scene, ob, bm, &aspx, &aspy);
+		if (aspx != aspy) {
+			param_aspect_ratio(handle, aspx, aspy);
+		}
+	}
+
+	/* we need the vert indices */
+	EDBM_mesh_elem_index_ensure_multi(objects, objects_len, BM_VERT);
+
+	int offset = 0;
+
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+	Object *obedit = objects[ob_index];
+	BMEditMesh *em = BKE_editmesh_from_object(obedit);
+	BMesh *bm = em->bm;
+
+	const int cd_loop_uv_offset = CustomData_get_offset(&bm->ldata, CD_MLOOPUV);
+
+	BM_ITER_MESH_INDEX (efa, &iter, bm, BM_FACES_OF_MESH, i) {
+
+		if ((BM_elem_flag_test(efa, BM_ELEM_HIDDEN)) || (sel && BM_elem_flag_test(efa, BM_ELEM_SELECT) == 0)) {
+			continue;
+		}
+
+		if (implicit) {
+			bool is_loopsel = false;
+
+			BM_ITER_ELEM (l, &liter, efa, BM_LOOPS_OF_FACE) {
+				if (uvedit_uv_select_test(scene, l, cd_loop_uv_offset)) {
+					is_loopsel = true;
+					break;
+				}
+			}
+			if (is_loopsel == false) {
+				continue;
+			}
+		}
+
+		construct_param_handle_face_add(handle, scene, efa, i + offset, cd_loop_uv_offset);
+	}
+
+	if (!implicit) {
+		BM_ITER_MESH (eed, &iter, bm, BM_EDGES_OF_MESH) {
+			if (BM_elem_flag_test(eed, BM_ELEM_SEAM)) {
+				ParamKey vkeys[2];
+				vkeys[0] = (ParamKey)BM_elem_index_get(eed->v1);
+				vkeys[1] = (ParamKey)BM_elem_index_get(eed->v2);
+				param_edge_set_seam(handle, vkeys);
+			}
+		}
+	}
+	offset += bm->totface;
+	}
+
+	param_construct_end(handle, fill, implicit);
+
+	return handle;
+}
+
 
 static void texface_from_original_index(BMFace *efa, int index, float **uv, ParamBool *pin, ParamBool *select,
                                         Scene *scene, const int cd_loop_uv_offset)
@@ -715,6 +816,7 @@ void UV_OT_minimize_stretch(wmOperatorType *ot)
 
 /* ******************** Pack Islands operator **************** */
 
+
 void ED_uvedit_pack_islands(Scene *scene, Object *ob, BMesh *bm, bool selected, bool correct_aspect, bool do_rotate)
 {
 	ParamHandle *handle;
@@ -724,14 +826,29 @@ void ED_uvedit_pack_islands(Scene *scene, Object *ob, BMesh *bm, bool selected,
 	param_delete(handle);
 }
 
+void ED_uvedit_pack_islands_multi(
+        Scene *scene, Object **objects, const uint objects_len,
+        bool selected, bool correct_aspect, bool do_rotate)
+{
+	ParamHandle *handle;
+	handle = construct_param_handle_multi(
+	        scene, objects, objects_len, true, false, selected, correct_aspect);
+	param_pack(handle, scene->toolsettings->uvcalc_margin, do_rotate);
+	param_flush(handle);
+	param_delete(handle);
+}
+
 static int pack_islands_exec(bContext *C, wmOperator *op)
 {
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	Scene *scene = CTX_data_scene(C);
-	Object *obedit = CTX_data_edit_object(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	bool do_rotate = RNA_boolean_get(op->ptr, "rotate");
 
-	if (!uvedit_have_selection(scene, em, true)) {
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data_with_uvs(view_layer, &objects_len);
+
+	if (!uvedit_have_selection_multi(scene, objects, objects_len, true)) {
+		MEM_SAFE_FREE(objects);
 		return OPERATOR_CANCELLED;
 	}
 
@@ -740,10 +857,15 @@ static int pack_islands_exec(bContext *C, wmOperator *op)
 	else
 		RNA_float_set(op->ptr, "margin", scene->toolsettings->uvcalc_margin);
 
-	ED_uvedit_pack_islands(scene, obedit, em->bm, true, true, do_rotate);
-	
-	DEG_id_tag_update(obedit->data, 0);
-	WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+	ED_uvedit_pack_islands_multi(scene, objects, objects_len, true, true, do_rotate);
+
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		DEG_id_tag_update(obedit->data, 0);
+		WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+	}
+
+	MEM_SAFE_FREE(objects);
 
 	return OPERATOR_FINISHED;
 }
@@ -856,7 +978,7 @@ void ED_uvedit_live_unwrap(Scene *scene, Object *obedit)
 	if (scene->toolsettings->edge_mode_live_unwrap &&
 	    CustomData_has_layer(&em->bm->ldata, CD_MLOOPUV))
 	{
-		ED_unwrap_lscm(scene, obedit, false); /* unwrap all not just sel */
+		ED_unwrap_lscm(scene, obedit, false, false); /* unwrap all not just sel */
 	}
 }
 
@@ -1178,7 +1300,7 @@ static void uv_map_clip_correct(Scene *scene, Object *ob, BMEditMesh *em, wmOper
 /* ******************** Unwrap operator **************** */
 
 /* assumes UV Map is checked, doesn't run update funcs */
-void ED_unwrap_lscm(Scene *scene, Object *obedit, const short sel)
+void ED_unwrap_lscm(Scene *scene, Object *obedit, const short sel, const bool pack)
 {
 	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	ParamHandle *handle;
@@ -1199,7 +1321,10 @@ void ED_unwrap_lscm(Scene *scene, Object *obedit, const short sel)
 	param_lscm_end(handle);
 
 	param_average(handle);
-	param_pack(handle, scene->toolsettings->uvcalc_margin, false);
+
+	if (pack) {
+		param_pack(handle, scene->toolsettings->uvcalc_margin, false);
+	}
 
 	param_flush(handle);
 
@@ -1208,33 +1333,48 @@ void ED_unwrap_lscm(Scene *scene, Object *obedit, const short sel)
 
 static int unwrap_exec(bContext *C, wmOperator *op)
 {
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	Scene *scene = CTX_data_scene(C);
-	Object *obedit = CTX_data_edit_object(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	int method = RNA_enum_get(op->ptr, "method");
 	const bool fill_holes = RNA_boolean_get(op->ptr, "fill_holes");
 	const bool correct_aspect = RNA_boolean_get(op->ptr, "correct_aspect");
 	const bool use_subsurf = RNA_boolean_get(op->ptr, "use_subsurf_data");
-	bool use_subsurf_final;
 	float obsize[3];
 	bool implicit = false;
 
-	if (!uvedit_have_selection(scene, em, implicit)) {
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(view_layer, &objects_len);
+
+	if (!uvedit_have_selection_multi(scene, objects, objects_len, implicit)) {
+		MEM_SAFE_FREE(objects);
 		return OPERATOR_CANCELLED;
 	}
-	
+
 	/* add uvs if they don't exist yet */
-	if (!ED_uvedit_ensure_uvs(C, scene, obedit)) {
-		return OPERATOR_CANCELLED;
-	}
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		bool use_subsurf_final;
+
+		if (!ED_uvedit_ensure_uvs(C, scene, obedit)) {
+			continue;
+		}
 
-	mat4_to_size(obsize, obedit->obmat);
-	if (!(fabsf(obsize[0] - obsize[1]) < 1e-4f && fabsf(obsize[1] - obsize[2]) < 1e-4f))
-		BKE_report(op->reports, RPT_INFO,
-		           "Object has non-uniform scale, unwrap will operate on a non-scaled version of the mesh");
-	else if (is_negative_m4(obedit->obmat))
-		BKE_report(op->reports, RPT_INFO,
-		           "Object has negative scale, unwrap will operate on a non-flipped version of the mesh");
+		mat4_to_size(obsize, obedit->obmat);
+		if (!(fabsf(obsize[0] - obsize[1]) < 1e-4f && fabsf(obsize[1] - obsize[2]) < 1e-4f))
+			BKE_report(op->reports, RPT_INFO,
+			           "Object has non-uniform scale, unwrap will operate on a non-scaled version of the mesh");
+		else if (is_negative_m4(obedit->obmat))
+			BKE_report(op->reports, RPT_INFO,
+			           "Object has negative scale, unwrap will operate on a non-flipped version of the mesh");
+
+
+		/* double up the check here but better keep ED_unwrap_lscm interface simple and not
+		 * pass operator for warning append */
+		modifier_unwrap_state(obedit, scene, &use_subsurf_final);
+		if (use_subsurf != use_subsurf_final) {
+			BKE_report(op->reports, RPT_INFO, "Subdivision Surface modifier needs to be first to work with unwrap");
+		}
+	}
 
 	/* remember last method for live unwrap */
 	if (RNA_struct_property_is_set(op->ptr, "method"))
@@ -1257,17 +1397,17 @@ static int unwrap_exec(bContext *C, wmOperator *op)
 	if (use_subsurf) scene->toolsettings->uvcalc_flag |= UVCALC_USESUBSURF;
 	else scene->toolsettings->uvcalc_flag &= ~UVCALC_USESUBSURF;
 
-	/* double up the check here but better keep ED_unwrap_lscm interface simple and not
-	 * pass operator for warning append */
-	modifier_unwrap_state(obedit, scene, &use_subsurf_final);
-	if (use_subsurf != use_subsurf_final)
-		BKE_report(op->reports, RPT_INFO, "Subdivision Surface modifier needs to be first to work with unwrap");
-
 	/* execute unwrap */
-	ED_unwrap_lscm(scene, obedit, true);
+	for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
+		Object *obedit = objects[ob_index];
+		ED_unwrap_lscm(scene, obedit, true, false);
+		DEG_id_tag_update(obedit->data, 0);
+		WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+	}
 
-	DEG_id_tag_update(obedit->data, 0);
-	WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+	ED_uvedit_pack_islands_multi(scene, objects, objects_len, true, true, true);
+
+	MEM_SAFE_FREE(objects);
 
 	return OPERATOR_FINISHED;
 }
@@ -1322,9 +1462,8 @@ static int uv_from_view_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSE
 
 static int uv_from_view_exec(bContext *C, wmOperator *op)
 {
+	ViewLayer *view_layer = CTX_data_view_layer(C);
 	Scene *scene = CTX_data_scene(C);
-	Object *obedit = CTX_data_edit_object(C);
-	BMEditMesh *em = BKE_editmesh_from_object(obedit);
 	ARegion *ar = CTX_wm_region(C);
 	View3D *v3d = CTX_wm_view3d(C);
 	RegionView3D *rv3d = CTX_wm_region_view3d(C);
@@ -1334,15 +1473,22 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
 	BMIter iter, liter;
 	MLoopUV *luv;
 	float rotmat[4][4];
+	bool changed_multi = false;
 
-	int cd_loop_uv_offset;
+	uint objects_len = 0;
+	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(view_layer, &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);
+	bool changed = false;
 
 	/* add uvs if they don't exist yet */
 	if (!ED_uvedit_ensure_uvs(C, scene, obedit)) {
-		return OPERATOR_CANCELLED;
+		continue;
 	}
 
-	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);
 
 	if (RNA_boolean_get(op->ptr, "orthographic")) {
 		uv_map_rotation_matrix(rotmat, rv3d, obedit, 90.0f, 0.0f, 1.0f);
@@ -1355,6 +1501,7 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
 				luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 				BLI_uvproject_from_view_ortho(luv->uv, l->v->co, rotmat);
 			}
+			changed = true;
 		}
 	}
 	else if (camera) {
@@ -1372,6 +1519,7 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
 					luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 					BLI_uvproject_from_camera(luv->uv, l->v->co, uci);
 				}
+				changed = true;
 			}
 			
 			MEM_freeN(uci);
@@ -1388,15 +1536,26 @@ static int uv_from_view_exec(bContext *C, wmOperator *op)
 				luv = BM_ELEM_CD_GET_VOID_P(l, cd_loop_uv_offset);
 				BLI_uvproject_from_view(luv->uv, l->v->co, rv3d->persmat, rotmat, ar->winx, ar->winy);
 			}
+			changed = true;
 		}
 	}
 
-	uv_map_clip_correct(scene, obedit, em, op);
+	if (changed) {
+		uv_map_clip_correct(scene, obedit, em, op);
 
-	DEG_id_tag_update(obedit->data, 0);
-	WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+		DEG_id_tag_update(obedit->data, 0);
+		WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
+		changed_multi = true;
+	}
+	}
+	MEM_SAFE_FREE(objects);
 
-	return OPERATOR_FINISHED;
+	if (changed_multi) {
+		return OPERATOR_FINISHED;
+	}
+	else {
+		return OPERATOR_CANCELLED;
+	}
 }
 
 static int uv_from_view_poll(bContext *C)