docs: private void saveSetting(String key, String value) throws Exception {
  
          Map<String, I_CmsPreference> prefs = OpenCms.getWorkplaceManager().getDefaultUserSettings().getPreferences();
          if (prefs.containsKey(key)) {
              prefs.get(key).setValue(m_currentPreferences, value);
          } else {
              LOG.error("Can't save user setting '" + key + "'");
          }
      }