scope stefansOS_loadingAnimation.

sS #text = "Stefan's OS is loading...";

static JFrame stefansOS_loadingAnimation(final Runnable onStop) {
  final JPanel panel = jBackground(Color.black, centerAndSouth(centerAndSouth(
    withMargin(50, jimage(#1101279)),
    withMargin(20, 40, 0, 40, setForeground(Color.white, setFont(#1011145, 60, jcenteredlabel(text))))),
    withMargin(20, jcenteredline(/*setMargin(10,*/ jbutton("STOP", r {
      callF(onStop);
      disposeWindow(heldInstance(JButton));
    })))));
  ret showCenterPackedFrame(text, panel);
}