### 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
add_child(import_buttons);
	import_collapse_types_button = memnew(Button);
	import_collapse_types_button->set_flat(true);
	import_collapse_types_button->set_tooltip_text(TTR("Collapse types."));
	import_buttons->add_child(import_collapse_types_button);
	import_collapse_types_button->connect("pressed", callable_mp(this, &ThemeItemImportTree::_toggle_type_items).bind(true));
	import_expand_types_button = memnew(Button);
	import_expand_types_button->set_flat(true);
	import_expand_types_button->set_tooltip_text(TTR("Expand types."));
	import_buttons->add_child(import_expand_types_button);
	import_expand_types_button->connect("pressed", callable_mp(this, &ThemeItemImportTree::_toggle_type_items).bind(false));
	import_buttons->add_child(memnew(VSeparator));
	import_select_all_button = memnew(Button);
	import_select_all_button->set_flat(true);
	import_select_all_button->set_text(TTR("Select All"));
	import_select_all_button->set_tooltip_text(TTR("Select all Theme items."));
	import_buttons->add_child(import_select_all_button);
	import_select_all_button->connect("pressed", callable_mp(this, &ThemeItemImportTree::_select_all_items_pressed));
	import_select_full_button = memnew(Button);
	import_select_full_button->set_flat(true);
	import_select_full_button->set_text(TTR("Select With Data"));
	import_select_full_button->set_tooltip_text(TTR("Select all Theme items with item data."));
	import_buttons->add_child(import_select_full_button);
	import_select_full_button->connect("pressed", callable_mp(this, &ThemeItemImportTree::_select_full_items_pressed));
	import_deselect_all_button = memnew(Button);
	import_deselect_all_button->set_flat(true);
	import_deselect_all_button->set_text(TTR("Deselect All"));
	import_deselect_all_button->set_tooltip_text(TTR("Deselect all Theme items."));
	import_buttons->add_child(import_deselect_all_button);
	import_deselect_all_button->connect("pressed", callable_mp(this, &ThemeItemImportTree::_deselect_all_items_pressed));