Anim: send notifier when deleting a node from a node tree/group

Send a WM notifier when deleting a node from a node tree/group. Removing
a node also removes its animation data, and thus animation editors need
to receive a notification to refresh.

Pull Request: https://projects.blender.org/blender/blender/pulls/128255

source/blender/editors/space_node/node_edit.cc

@@ -1968,6 +1968,10 @@ static int node_delete_reconnect_exec(bContext *C, wmOperator * /*op*/)
     if (node->flag & SELECT) {
       blender::bke::node_internal_relink(snode->edittree, node);
       bke::node_remove_node(bmain, snode->edittree, node, true);
+
+      /* Since this node might have been animated, and that animation data been
+       * deleted, a notifier call is necessary to redraw any animation editor. */
+      WM_event_add_notifier(C, NC_ANIMATION | ND_ANIMCHAN, nullptr);
     }
   }