// buttons = (text, runnable | JButton)...
// use e.g. maxToShow := 2 to hide all but 2 buttons in a pop-down menu
static JPanel jLabelWithButtons(S text, O... buttons, O... _) {
  optPar int maxToShow = 1000;
  ret centerAndEastWithMargins(jLabel(text), jcenteredbuttons_withPopDown(maxToShow, buttons));
}