static JPanel vstack2(fO... parts) {
  ret swing(func -> JPanel {
    JPanel panel = new JPanel(new GridBagLayout);
    new GridBagConstraints gbc;
    gbc.weightx = 1;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    smartAddWithLayout(panel, gbc, parts);
    //gbc = (GridBagConstraints) gbc.clone();
    //gbc.fill = GridBagConstraints.BOTH;
    gbc.weighty = 1;
    panel.add(jrigid(), gbc);
    ret panel;
  });
}

Began life as a copy of #1001761