static Dimension componentsBoundingSize(Container container, int insetBottomRight) {
  Rectangle r = new Rectangle(0, 0, 0, 0);
  for (Component c : container.getComponents())
    r = rectangleUnion(r, c.getBounds());
  ret new Dimension(r.x+r.width+insetBottomRight, r.y+r.height+insetBottomRight);
}