WorkSpace: fix mode exiting w/ multi-window

Activating an object exited modes for all other objects in the layer.
Now check these objects aren't active in other windows first.

source/blender/editors/include/ED_object.h

@@ -160,6 +160,9 @@ bool ED_object_mode_generic_enter(
 void ED_object_mode_generic_exit(
         const struct EvaluationContext *eval_ctx,
         struct WorkSpace *workspace, struct Scene *scene, struct Object *ob);
+bool ED_object_mode_generic_has_data(
+        const struct EvaluationContext *eval_ctx,
+        struct Object *ob);
 
 void ED_object_location_from_view(struct bContext *C, float loc[3]);
 void ED_object_rotation_from_view(struct bContext *C, float rot[3], const char align_axis);

source/blender/editors/object/object_edit.c

@@ -2096,33 +2096,65 @@ bool ED_object_mode_generic_enter(
  * Use for changing works-paces or changing active object.
  * Caller can check #OB_MODE_ALL_MODE_DATA to test if this needs to be run.
  */
-void ED_object_mode_generic_exit(
+static bool ed_object_mode_generic_exit_ex(
         const struct EvaluationContext *eval_ctx,
-        struct WorkSpace *workspace, struct Scene *scene, struct Object *ob)
+        struct WorkSpace *workspace, struct Scene *scene, struct Object *ob,
+        bool only_test)
 {
 	if (eval_ctx->object_mode & OB_MODE_EDIT) {
 		if (BKE_object_is_in_editmode(ob)) {
+			if (only_test) {
+				return true;
+			}
 			ED_object_editmode_exit_ex(NULL, workspace, scene, ob, EM_FREEDATA);
 		}
 	}
 	else if (eval_ctx->object_mode & OB_MODE_VERTEX_PAINT) {
 		if (ob->sculpt && (ob->sculpt->mode_type == OB_MODE_VERTEX_PAINT)) {
+			if (only_test) {
+				return true;
+			}
 			ED_object_vpaintmode_exit_ex(workspace, ob);
 		}
 	}
 	else if (eval_ctx->object_mode & OB_MODE_WEIGHT_PAINT) {
 		if (ob->sculpt && (ob->sculpt->mode_type == OB_MODE_WEIGHT_PAINT)) {
+			if (only_test) {
+				return true;
+			}
 			ED_object_wpaintmode_exit_ex(workspace, ob);
 		}
 	}
 	else if (eval_ctx->object_mode & OB_MODE_SCULPT) {
 		if (ob->sculpt && (ob->sculpt->mode_type == OB_MODE_SCULPT)) {
+			if (only_test) {
+				return true;
+			}
 			ED_object_sculptmode_exit_ex(eval_ctx, workspace, scene, ob);
 		}
 	}
 	else {
+		if (only_test) {
+			return false;
+		}
 		BLI_assert((eval_ctx->object_mode & OB_MODE_ALL_MODE_DATA) == 0);
 	}
+
+	return false;
+}
+
+void ED_object_mode_generic_exit(
+        const struct EvaluationContext *eval_ctx,
+        struct WorkSpace *workspace, struct Scene *scene, struct Object *ob)
+{
+	ed_object_mode_generic_exit_ex(eval_ctx, workspace, scene, ob, false);
+}
+
+bool ED_object_mode_generic_has_data(
+        const struct EvaluationContext *eval_ctx,
+        struct Object *ob)
+{
+	return ed_object_mode_generic_exit_ex(eval_ctx, NULL, NULL, ob, true);
 }
 
 bool ED_object_editmode_calc_active_center(Object *obedit, const bool select_only, float r_center[3])

source/blender/editors/object/object_select.c

@@ -157,11 +157,16 @@ void ED_object_base_activate(bContext *C, Base *base)
 		 * Not correct because it's possible other work-spaces use these.
 		 * although that's a corner case. */
 		if (workspace->object_mode & OB_MODE_ALL_MODE_DATA) {
+			wmWindowManager *wm = CTX_wm_manager(C);
 			EvaluationContext eval_ctx;
 			CTX_data_eval_ctx(C, &eval_ctx);
 			FOREACH_OBJECT_BEGIN(view_layer, ob) {
 				if (ob != obact) {
-					ED_object_mode_generic_exit(&eval_ctx, workspace, scene, ob);
+					if (ED_object_mode_generic_has_data(&eval_ctx, ob) &&
+					    ED_workspace_object_mode_in_other_window(wm, workspace, ob, NULL) == false)
+					{
+						ED_object_mode_generic_exit(&eval_ctx, workspace, scene, ob);
+					}
 				}
 			}
 			FOREACH_OBJECT_END;

source/blender/editors/screen/workspace_edit.c

@@ -352,7 +352,9 @@ bool ED_workspace_object_mode_in_other_window(
 			ViewLayer *view_layer_iter = BKE_view_layer_from_workspace_get(scene_iter, workspace_iter);
 			Object *obact_iter = OBACT(view_layer_iter);
 			if (obact == obact_iter) {
-				*r_object_mode = workspace_iter->object_mode;
+				if (r_object_mode) {
+					*r_object_mode = workspace_iter->object_mode;
+				}
 				return true;
 			}
 		}