Fix "Make Scene Root" deleting previous root whenever focusing anothe…

…r scene

Hopefully fixes godotengine#24484 and fixes godotengine#27222.

(cherry picked from commit cfc779c)

editor/scene_tree_dock.cpp

@@ -590,9 +590,8 @@ void SceneTreeDock::_tool_selected(int p_tool, bool p_confirm_override) {
 
 			editor_data->get_undo_redo().create_action(TTR("Make node as Root"));
 			editor_data->get_undo_redo().add_do_method(node->get_parent(), "remove_child", node);
-			editor_data->get_undo_redo().add_do_method(root->get_parent(), "remove_child", root);
-			editor_data->get_undo_redo().add_do_method(node, "add_child", root);
 			editor_data->get_undo_redo().add_do_method(editor, "set_edited_scene", node);
+			editor_data->get_undo_redo().add_do_method(node, "add_child", root);
 			editor_data->get_undo_redo().add_do_method(node, "set_filename", root->get_filename());
 			editor_data->get_undo_redo().add_do_method(root, "set_filename", String());
 			editor_data->get_undo_redo().add_do_method(node, "set_owner", (Object *)NULL);
@@ -604,14 +603,13 @@ void SceneTreeDock::_tool_selected(int p_tool, bool p_confirm_override) {
 			editor_data->get_undo_redo().add_undo_method(node, "remove_child", root);
 			editor_data->get_undo_redo().add_undo_method(editor, "set_edited_scene", root);
 			editor_data->get_undo_redo().add_undo_method(node->get_parent(), "add_child", node);
+			editor_data->get_undo_redo().add_undo_method(node->get_parent(), "move_child", node, node->get_index());
 			editor_data->get_undo_redo().add_undo_method(root, "set_owner", (Object *)NULL);
 			editor_data->get_undo_redo().add_undo_method(node, "set_owner", root);
-
 			_node_replace_owner(root, root, root, MODE_UNDO);
 
 			editor_data->get_undo_redo().add_do_method(scene_tree, "update_tree");
 			editor_data->get_undo_redo().add_undo_method(scene_tree, "update_tree");
-			editor_data->get_undo_redo().add_undo_reference(root);
 			editor_data->get_undo_redo().commit_action();
 		} break;
 		case TOOL_MULTI_EDIT: {