Fix T69822: Switching sculpt objects breaks undo

This introduces object mode tagging for data which hasn't yet been
written back to the ID data.

Now when selecting other sculpt objects, the original objects data is
flushed back to the ID before writing a memfile undo step.

1 files changed, 13 insertions, 1 deletions

diff --git a/source/blender/editors/object/object_edit.c b/source/blender/editors/object/object_edit.c
index 70d024c7902..be815fb0d10 100644
--- a/source/blender/editors/object/object_edit.c
+++ b/source/blender/editors/object/object_edit.c
@@ -514,6 +514,11 @@ static bool ED_object_editmode_load_ex(Main *bmain, Object *obedit, const bool f
     }
   }
 
+  char *needs_flush_ptr = BKE_object_data_editmode_flush_ptr_get(obedit->data);
+  if (needs_flush_ptr) {
+    *needs_flush_ptr = false;
+  }
+
   return true;
 }
 
@@ -616,10 +621,13 @@ bool ED_object_editmode_enter_ex(Main *bmain, Scene *scene, Object *ob, int flag
     WM_main_add_notifier(NC_SCENE | ND_MODE | NS_EDITMODE_MESH, NULL);
   }
   else if (ob->type == OB_ARMATURE) {
+    bArmature *arm = ob->data;
     ok = 1;
-    ED_armature_to_edit(ob->data);
+    ED_armature_to_edit(arm);
     /* to ensure all goes in restposition and without striding */
 
+    arm->needs_flush_to_id = 0;
+
     /* XXX: should this be ID_RECALC_GEOMETRY? */
     DEG_id_tag_update(&ob->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
 
@@ -632,9 +640,13 @@ bool ED_object_editmode_enter_ex(Main *bmain, Scene *scene, Object *ob, int flag
     WM_main_add_notifier(NC_SCENE | ND_MODE | NS_EDITMODE_TEXT, scene);
   }
   else if (ob->type == OB_MBALL) {
+    MetaBall *mb = ob->data;
+
     ok = 1;
     ED_mball_editmball_make(ob);
 
+    mb->needs_flush_to_id = 0;
+
     WM_main_add_notifier(NC_SCENE | ND_MODE | NS_EDITMODE_MBALL, scene);
   }
   else if (ob->type == OB_LATTICE) {