static JComponent jSliderPlusValue(JSlider slider, S unit default "") {
  ret jSliderPlusValue(slider, value -> spaceCombine(n2(value), unit));
}

static JComponent jSliderPlusValue(JSlider slider, IF1<Int, S> renderValue) {
  var lbl = jlabel();
  onChangeAndNow(slider, -> lbl.setText(renderValue.get(slider.getValue())));
  ret centerAndEastWithMargin(slider, lbl);
}