static <A extends Component> A centerPackInternalFrameWithMinSize(int w, int h, A c) {
  ret centerPackInternalFrameWithMinSize(Pt(w, h), c);
}

static <A extends Component> A centerPackInternalFrameWithMinSize(Pt minSize, A c) {
  JInternalFrame win = getInternalFrame(c);
  if (win == null || getParent(win) == null) ret c;
  swing {
    win.pack();
    if (minSize != null) minFrameSize(win, minSize.x, minSize.y);
    centerInternalFrame(win);
    fixInternalFrame(win);
  }
  ret c;
}

static <A extends Component> A centerPackInternalFrameWithMinSize(A c, Pt minSize) {
  ret centerPackInternalFrameWithMinSize(minSize, c);
}