sbool mouseEventIsInBorder(MouseEvent e) swing {

  var c = optCast JComponent(e.getComponent());

  if (c == null) false;

  var border = c.getBorder();

  if (border == null) false;

  Insets insets = border.getBorderInsets(c);

  int x = e.getX(), y = e.getY();

  int w = c.getWidth(), h = c.getHeight();

  bool result = x < insets.left

    || x >= w-insets.right

    || y < insets.top

    || y >= h-insets.bottom;

  printVars ifdef mouseEventIsInBorder_debug("mouseEventIsInBorder " + result, +insets, +w, +h, +x, +y);

  ret result;

}