sbool addThingOnScreenDefinition(S md5, S text) {
  text = nullIfEmpty(text);
  SS map = thingsOnScreenDefinitions();
  if (eq(map.get(md5), text)) false;
  mapPutOrRemove(map, md5, text);
  logStructure(screenClipCommentsFile(), ll(md5, text));
  logQuoted(appendToFileName(screenClipCommentsFile(), ".with-dates"),
    "[" + localDateWithMilliseconds() + "] " + struct(ll(md5, text)));
  true;
}