docs: protected CmsGalleryWidgetConfiguration getWidgetConfiguration(
          CmsObject cms,
          CmsMessages messages,
          I_CmsWidgetParameter param) {
  
          if (m_widgetConfiguration == null) {
              m_widgetConfiguration = new CmsGalleryWidgetConfiguration(cms, messages, param, getConfiguration());
          }
          return m_widgetConfiguration;
      }