docs: private Map<String, CmsXmlContentProperty> removeHiddenProperties(Map<String, CmsXmlContentProperty> propConfig) {
  
          Map<String, CmsXmlContentProperty> result = new LinkedHashMap<String, CmsXmlContentProperty>();
          for (Map.Entry<String, CmsXmlContentProperty> entry : propConfig.entrySet()) {
              if (!m_handler.isHiddenProperty(entry.getKey())) {
                  result.put(entry.getKey(), entry.getValue());
              }
          }
          return result;
      }