docs: public void addFormatterSetting(String containerName, String formatterId) {
  
          Map<String, String> newSettings = new HashMap<String, String>(m_individualSettings);
          newSettings.put(CmsFormatterConfig.getSettingsKeyForContainer(containerName), formatterId);
          m_individualSettings = Collections.unmodifiableMap(newSettings);
          if (m_inMemoryOnly) {
              String editorHash = m_editorHash;
              if (editorHash.contains(CmsADEManager.CLIENT_ID_SEPERATOR)) {
                  editorHash = editorHash.substring(0, editorHash.indexOf(CmsADEManager.CLIENT_ID_SEPERATOR));
              }
              editorHash += getSettingsHash();
              m_editorHash = editorHash;
          } else {
              m_editorHash = m_elementId.toString() + getSettingsHash();
          }
      }