docs: protected void ensureFocusedScrolling() {
  
          if (m_focusedScrollingHandler == null) {
              m_focusedScrollingHandler = CmsFocusedScrollingHandler.installFocusedScrollingHandler(this);
          } else if (!m_focusedScrollingHandler.isRegistered()) {
              m_focusedScrollingHandler.register();
          }
      }