### 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
if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_select_all_subitems(root, false);
	updating_tree = false;
}
void ThemeItemImportTree::_select_full_items_pressed() {
	if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_select_all_subitems(root, true);
	updating_tree = false;
}
void ThemeItemImportTree::_deselect_all_items_pressed() {
	if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_deselect_all_subitems(root, true);
	updating_tree = false;
}
void ThemeItemImportTree::_select_all_data_type_pressed(int p_data_type) {