// (kind of) TODO: reads file on AWT thread
static int jComboBoxOnTrimmedFileContents_defaultInterval = 1000;

static JComboBox jComboBoxOnTrimmedFileContents(LS items, File f, S defaultContents) {
  final Pair<SimpleLiveValue<S>, Runnable> p = trimmedFileLiveValue(f, defaultContents);
  JComboBox cb = jLiveValueComboBox(items, p.a);
  awtEvery(cb, jComboBoxOnTrimmedFileContents_defaultInterval, p.b);
  ret cb;
}