code: private Map<String, String> generateCommonConfigPart() {
  
          Map<String, String> result = new HashMap<>();
          if (m_category != null) {
              result.put(CONFIGURATION_CATEGORY, m_category);
          }
          // append 'only leafs' to configuration
          if (m_onlyLeafs) {
              result.put(CONFIGURATION_ONLYLEAFS, null);
          }
          // append 'property' to configuration
          if (m_property != null) {
              result.put(CONFIGURATION_PROPERTY, m_property);
          }
          // append 'selectionType' to configuration
          if (m_selectiontype != null) {
              result.put(CONFIGURATION_SELECTIONTYPE, m_selectiontype);
          }
          return result;
      }
docs: Helper to generate the common configuration part for client-side and server-side widget.
  @return the common configuration options as map