static int vstackWithSpacing_default = 10;

static JPanel vstackWithSpacing(L parts, int spacing) {
  JPanel panel = new JPanel(new GridBagLayout);
  new GridBagConstraints gbc;
  gbc.weightx = 1;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  gbc.gridwidth = GridBagConstraints.REMAINDER;
  gbc.insets = new Insets(spacing/2, 0, spacing/2, 0); // well...
  smartAddWithLayout(panel, gbc, toObjectArray(parts));
  //gbc = (GridBagConstraints) gbc.clone();
  //gbc.fill = GridBagConstraints.BOTH;
  gbc.weighty = 1;
  gbc.insets = new Insets(0, 0, 0, 0);
  panel.add(Box.createRigidArea(new Dimension(0, 0)), gbc);
  ret panel;
}

static JPanel vstackWithSpacing(Component... parts) {
  ret vstackWithSpacing(asList(parts), vstackWithSpacing_default);
}