code: @PrefMetadata(type = CmsGalleryShowInvalidDefaultPreference.class)
      public String getGalleryShowInvalidDefault() {
  
          return m_settings.getAdditionalPreference(CmsGalleryService.PREF_GALLERY_SHOW_INVALID_DEFAULT, false);
      }
docs: Gets the value of the 'show invalid elements in galleries'.<p>
  
  @return the 'show invalid elements in galleries' setting