private void init(@Nullable List<? extends CompositeArrangementSettingsToken> tokens) {
    setLayout(new GridBagLayout());
    setBorder(JBUI.Borders.empty(5));

    if (tokens != null) {
      for (CompositeArrangementSettingsToken token : tokens) {
        addToken(token);
      }
    }

    applyBackground(UIUtil.getListBackground());
  }
private void init(@Nullable List<? extends CompositeArrangementSettingsToken> tokens)