static void robotDragMouse(final Point a, int delay, final Point b) ctex {
  final new Robot robot;
  robot.mouseMove(a.x, a.y);
  final int button = InputEvent.BUTTON1_DOWN_MASK;
  robot.mousePress(button);
  swingLater(delay, r {
    robot.mouseMove(b.x, b.y);
    robot.mouseRelease(button);
  });
}

Began life as a copy of #1005571