please include function flatInfoBox.

static int showWindowInTopRightCorner_x = 50;
static int showWindowInTopRightCorner_y = 5;

static JWindow showWindowInTopRightCorner(JComponent c) {
  ret showWindowInTopRightCorner(c, flatInfoBox_defaultTime);
}

static JWindow showWindowInTopRightCorner(final JComponent c, final double seconds) {
  if (isHeadless()) null;
  ret swing(func -> JWindow {
    final JWindow window = showWindow(c);
    window.pack();
    window.setBounds(screenWidth()-window.getWidth()-showWindowInTopRightCorner_x, showWindowInTopRightCorner_y, window.getWidth(), window.getHeight());
    window.setAlwaysOnTop(true);
    window.setVisible(true);
    disposeWindowAfter(iround(seconds*1000), window);
    ret window;
  });
}