static AutoCloseable tempOnWindowStateChanged(Component c, Runnable r) {
  ret c == null ? null : swing(() -> {
    Window w = getWindow(c);
    if (w == null) null;
    WindowListener l = new WindowAdapter {
      public void windowIconified(WindowEvent e) {
        temp tempRememberListener(w, 'removeWindowListener, this);
        pcallF(r);
      }
    };
    w.addWindowListener(l);
    ret autoCloseable { swing { w.removeWindowListener(l); } };
  });
}