@Nullable
  private static JComponent createActionComponent(@Nullable final AnAction action) {
    if (action == null) return null;

    ActionToolbar toolbar = ActionManager.getInstance().createActionToolbar("DiffSplitter", new DefaultActionGroup(action), true);
    toolbar.setTargetComponent(toolbar.getComponent());
    toolbar.setReservePlaceAutoPopupIcon(false);
    toolbar.getComponent().setCursor(Cursor.getDefaultCursor());
    return toolbar.getComponent();
  }
@Nullable
  private static JComponent createActionComponent(@Nullable final AnAction action)