Ensure multinode undo redo merges ends for operation, fixes #19010

editor/multi_node_edit.cpp

@@ -52,7 +52,7 @@ bool MultiNodeEdit::_set_impl(const StringName &p_name, const Variant &p_value,
 
 	UndoRedo *ur = EditorNode::get_singleton()->get_undo_redo();
 
-	ur->create_action(TTR("MultiNode Set") + " " + String(name));
+	ur->create_action(TTR("MultiNode Set") + " " + String(name), UndoRedo::MERGE_ENDS);
 	for (const List<NodePath>::Element *E = nodes.front(); E; E = E->next()) {
 
 		if (!es->has_node(E->get()))