static <A> A setFrameTitle(A c, fS title) {
  final Frame f = getAWTFrame(c);
  if (f != null) swing { f.setTitle(title); }
  ret c;
}

static <A extends Component> A setFrameTitle(S title, A c) {
  ret setFrameTitle(c, title);
}

// magically find a field called "frame" in main class :-)
static JFrame setFrameTitle(S title) {
  O f = getOpt(mc(), "frame");
  if (f instanceof JFrame)
    ret setFrameTitle((JFrame) f, title);
  ret null;
}

Began life as a copy of #1001439