PyAPI: Store PyInstances for ID's

This means once an ID is created,
it will keep using the same PyObject instance.

This has some advantages:
- Avoids unnecessary re-creation of instances on UI poll / redraw.
- Accessing free'd ID's gives an exception instead of crashing.
  (long standing annoyance!, though this only applies to ID's
   and not yet other data that uses the ID's - vertices for eg).
- Allows using instance comparison (a little faster).

Note that the instances won't be kept between undo.

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index a3b0b8ac2c7..da08aa4685c 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1720,12 +1720,12 @@ typedef struct Scene {
 	/* Physics simulation settings */
 	struct PhysicsSettings physics_settings;
 
-	/* Movie Tracking */
-	struct MovieClip *clip;			/* active movie clip */
-
 	uint64_t customdata_mask;	/* XXX. runtime flag for drawing, actually belongs in the window, only used by BKE_object_handle_update() */
 	uint64_t customdata_mask_modal; /* XXX. same as above but for temp operator use (gl renders) */
 
+	/* Movie Tracking */
+	struct MovieClip *clip;			/* active movie clip */
+
 	/* Color Management */
 	ColorManagedViewSettings view_settings;
 	ColorManagedDisplaySettings display_settings;