@Override
    protected JScrollPane createScroller() {
      final var sp = new JBScrollPane(list,
                                      ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                                      ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
      sp.setHorizontalScrollBar(null);
      sp.setOverlappingScrollBar(true);
      return sp;
    }
@Override
    protected JScrollPane createScroller()