// action = runnable or method name
static void onChangeAndNow(JComponent c, O r) {
  onUpdateAndNow(c, r);
}

static void onChangeAndNow(L<? extends JComponent> l, O r) {
  onUpdateAndNow(l, r);
}

svoid onChangeAndNow(JTextComponent c, IVF1<S> r) {
  onUpdateAndNow(c, r);
}

static <A> JComboBox<A> onChangeAndNow(JComboBox<A> cb, IVF1<A> f) {
  onChange(cb, f);
  f?.get(getSelectedItem_typed(cb));
  ret cb;
}

static <A extends JTabbedPane> A onChangeAndNow(A tabs, Runnable r) {
  if (r != null) {
    onChange(tabs, r);
    r.run();
  }
  ret tabs;
}

static JSlider onChangeAndNow(JSlider s, Runnable f) {
  if (s != null && f != null) {
    onChange(s, f);
    f.run();
  }
  ret s;
}

Began life as a copy of #1006125