// onClick: voidfunc(Point, int) - 2nd parameter is button (1 to 3)
// or voidfunc(Point)
static void trackOneClick(final O onClick) {
  forwardOneClick(func(final Point p, final int button) {
    awt { // Let the window go away first
      callFOpt(onClick, p, button);
      callFOpt(onClick, p);
    }
    false; // don't forward click
  });
}