static <A extends Component> A maximizeFrame(A c) {
  JFrame f = swing(func -> JFrame {
    JFrame f = getFrame(c);
    if (f != null)
      f.setExtendedState(JFrame.MAXIMIZED_BOTH);
    ret f;
  });
  
  // wait until frame is actually maximized so
  // we can add components based on correct size
  if (f != null && !isAWTThread()) {
    Dimension d = maximumWindowBounds().getSize();
    long start = sysNow();
    repeat with ms sleep 1 {
      if (f.getWidth() >= d.getWidth()-100 && f.getHeight() >= d.getHeight()-100) break;
      if (sysNow() >= start+100) { warn("maximizeFrame timeout"); break; }
    }
  }
  ret c;
}

Began life as a copy of #1003513