search method
Implementation
List<UDocMarkup> search(String query, {UDocMarkupKind? kind, Color? color}) {
final String needle = UDocText.forSearch(query);
return _markups.where((UDocMarkup markup) {
if (kind != null && markup.kind != kind) return false;
if (color != null && markup.color.toARGB32() != color.toARGB32()) return false;
if (needle.isEmpty) return true;
return UDocText.forSearch("${markup.text} ${markup.note}").contains(needle);
}).toList()..sort(_readingOrder);
}