docs: public static void checkWidgetRequirements(String key, I_CmsFormWidget widget) {
  
          if (widget instanceof CmsTinyMCEWidget) {
              return;
          }
          if (!((widget instanceof I_CmsHasGhostValue) && (widget instanceof HasValueChangeHandlers<?>))) {
              throw new CmsWidgetNotSupportedException(key);
          }
      }