### 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
import_items_filter->clear();
	selected_items.clear();
	total_selected_colors_label->hide();
	total_selected_constants_label->hide();
	total_selected_fonts_label->hide();
	total_selected_font_sizes_label->hide();
	total_selected_icons_label->hide();
	total_selected_styleboxes_label->hide();
	_update_items_tree();
}
bool ThemeItemImportTree::has_selected_items() const {
	return (selected_items.size() > 0);
}
void ThemeItemImportTree::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			select_icons_warning_icon->set_texture(get_theme_icon(SNAME("StatusWarning"), SNAME("EditorIcons")));
			select_icons_warning->add_theme_color_override("font_color", get_theme_color(SNAME("disabled_font_color"), SNAME("Editor")));
			import_items_filter->set_right_icon(get_theme_icon(SNAME("Search"), SNAME("EditorIcons")));
			
			import_collapse_types_button->set_icon(get_theme_icon(SNAME("CollapseTree"), SNAME("EditorIcons")));
			import_expand_types_button->set_icon(get_theme_icon(SNAME("ExpandTree"), SNAME("EditorIcons")));
			import_select_all_button->set_icon(get_theme_icon(SNAME("ThemeSelectAll"), SNAME("EditorIcons")));
			import_select_full_button->set_icon(get_theme_icon(SNAME("ThemeSelectFull"), SNAME("EditorIcons")));
			import_deselect_all_button->set_icon(get_theme_icon(SNAME("ThemeDeselectAll"), SNAME("EditorIcons")));
			
			select_colors_icon->set_texture(get_theme_icon(SNAME("Color"), SNAME("EditorIcons")));