### Godot version

4.1.1

### System information

linux

### Issue description

[simplescreenrecorder-2023-08-30_15.01.51.webm](https://github.com/godotengine/godot-proposals/assets/71937306/537d92b9-4f98-4fe6-adf4-71297be0471a)

I guess this wasn't the case before since I could save a layout named "2 monitors".

### Steps to reproduce

press space

### Minimal reproduction project

none
}
			has_any_items = true;
		}
	}
	
	TreeItem *selected_item = edit_type_list->get_selected();
	if (selected_item) {
		if (!has_any_items) {
			edit_items_message->set_text(TTR("This theme type is empty.\nAdd more items to it manually or by importing from another theme."));
			edit_items_message->show();
		} else {
			edit_items_message->set_text("");
			edit_items_message->hide();
		}
	}
}
void ThemeItemEditorDialog::_item_tree_button_pressed(Object *p_item, int p_column, int p_id, MouseButton p_button) {
	if (p_button != MouseButton::LEFT) {
		return;
	}
	TreeItem *item = Object::cast_to<TreeItem>(p_item);
	if (!item) {
		return;
	}
	switch (p_id) {
		case ITEMS_TREE_RENAME_ITEM: {
			String item_name = item->get_text(0);
			int data_type = item->get_parent()->get_metadata(0);
			_open_rename_theme_item_dialog((Theme::DataType)data_type, item_name);
			_update_edit_item_tree(edited_item_type);