### Godot version

4.x

### System information

Windows 10

### Issue description

The `Search Result` panel is not correctly updated when changing the theme.

https://user-images.githubusercontent.com/66004280/208964493-d0423b78-3418-44c9-95ed-822fd34c4720.mp4



### Steps to reproduce

1. Search something
2. Change the theme

### Minimal reproduction project

--
start_search();
}
void FindInFilesPanel::_on_cancel_button_clicked() {
	stop_search();
}
void FindInFilesPanel::_on_result_selected() {
	TreeItem *item = _results_display->get_selected();
	HashMap<TreeItem *, Result>::Iterator E = _result_items.find(item);
	if (!E) {
		return;
	}
	Result r = E->value;
	TreeItem *file_item = item->get_parent();
	String fpath = file_item->get_metadata(0);
	emit_signal(SNAME(SIGNAL_RESULT_SELECTED), fpath, r.line_number, r.begin, r.end);
}
void FindInFilesPanel::_on_replace_text_changed(String text) {