Fix T65816: Alembic export of procedural mesh results in a static mesh and crashes

The static mesh issue described in T65816 has been resolved by @Sergey
in T60094.

This commit fixes the last bit of the puzzle, which was two-fold:
- A missing depsgraph update when setting `orig_object.data = new_mesh`
  from Python. Thanks @Sergey for providing the fix :)
- Properly locking the interface while exporting. This prevents crashes
  as described in T60094. The previous approach of calling
  `BKE_spacedata_draw_locks()` was not enough.

1 files changed, 3 insertions, 7 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_build.cc b/source/blender/depsgraph/intern/depsgraph_build.cc
index 968ed8ef403..e34c8af0cf3 100644
--- a/source/blender/depsgraph/intern/depsgraph_build.cc
+++ b/source/blender/depsgraph/intern/depsgraph_build.cc
@@ -59,6 +59,7 @@ extern "C" {
 #include "intern/node/deg_node_id.h"
 #include "intern/node/deg_node_operation.h"
 
+#include "intern/depsgraph_registry.h"
 #include "intern/depsgraph_type.h"
 
 /* ****************** */
@@ -356,12 +357,7 @@ void DEG_graph_relations_update(Depsgraph *graph, Main *bmain, Scene *scene, Vie
 void DEG_relations_tag_update(Main *bmain)
 {
   DEG_GLOBAL_DEBUG_PRINTF(TAG, "%s: Tagging relations for update.\n", __func__);
-  LISTBASE_FOREACH (Scene *, scene, &bmain->scenes) {
-    LISTBASE_FOREACH (ViewLayer *, view_layer, &scene->view_layers) {
-      Depsgraph *depsgraph = (Depsgraph *)BKE_scene_get_depsgraph(bmain, scene, view_layer, false);
-      if (depsgraph != NULL) {
-        DEG_graph_tag_relations_update(depsgraph);
-      }
-    }
+  for (DEG::Depsgraph *depsgraph : DEG::get_all_registered_graphs(bmain)) {
+    DEG_graph_tag_relations_update(reinterpret_cast<Depsgraph *>(depsgraph));
   }
 }