code: private boolean updateLinkAddValues() {
          List<String> linkValues = m_dbObj.getFieldValues(m_linkDef.getName());
          if (linkValues == null || linkValues.size() == 0) {
              return false;
          }
          Set<String> linkValueSet = new HashSet<>(linkValues);   // remove duplicates
          for (String targetObjID : linkValueSet) {
              addLinkValue(targetObjID);
          }
          return true;
      }
docs: Add new values for our link. Return true if at least one update made.