private @Nullable JViewport getScrollableTabViewport() {
    Optional<JViewport> optional = UIUtil.findComponentsOfType(tabPane, JViewport.class).stream().filter(
      viewport -> "TabbedPane.scrollableViewport".equals(viewport.getName())).findFirst();
    return optional.orElse(null);
  }
private @Nullable JViewport getScrollableTabViewport()