code: private void addEditingHistoryItem(boolean prohibitReturn) {
  
          if (prohibitReturn) {
              History.newItem(EDITOR_FOR_NO_RETURN_HASH_KEY, false);
          } else {
              History.newItem(
                  EDITOR_HASH_KEY
                      + CmsContainerpageController.getServerId(getCurrentElementId())
                      + (m_dependingElementId != null ? "," + m_dependingElementId + ";" : ";"),
                  false);
          }
      }
docs: Adds a history item for the opened editor.<p>
  Use the prohibitReturn flag to deny a return to the opened editor through the browser history.
  Use this feature for inline editing or when opening the editor for new resources.<p>
  
  @param prohibitReturn if <code>true</code> returning to the opened editor through the browser history is denied