clutter: Trigger pointer repick after animatable property changes

This is notably necessary with transformations, since these don't
trigger allocation machinery, but may affect the actor under the
pointer.

Visible e.g. with GNOME Shell's "Application does not respond"
dialogs.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1915>

clutter/clutter/clutter-actor.c

@@ -13266,6 +13266,22 @@ clutter_actor_set_animatable_property (ClutterActor *actor,
   g_object_thaw_notify (obj);
 }
 
+static void
+clutter_actor_update_pointer (ClutterActor *self)
+{
+  ClutterInputDevice *pointer;
+  ClutterStage *stage;
+  ClutterSeat *seat;
+
+  stage = CLUTTER_STAGE (_clutter_actor_get_stage_internal (self));
+  if (!stage)
+    return;
+
+  seat = clutter_backend_get_default_seat (clutter_get_default_backend ());
+  pointer = clutter_seat_get_pointer (seat);
+  clutter_stage_repick_device (stage, pointer);
+}
+
 static void
 clutter_actor_set_final_state (ClutterAnimatable *animatable,
                                const gchar       *property_name,
@@ -13316,6 +13332,8 @@ clutter_actor_set_final_state (ClutterAnimatable *animatable,
         }
     }
 
+  clutter_actor_update_pointer (actor);
+
   g_free (p_name);
 }