docs: @SuppressWarnings("unused") // expose utility check method to subclasses
      protected FormValidation checkDisplayName(@Nonnull View view, @CheckForNull String value) {
          if (StringUtils.isBlank(value)) {
              // no custom name, no need to check
              return FormValidation.ok();
          }
          for (View v: view.owner.getViews()) {
              if (v.getViewName().equals(view.getViewName())) {
                  continue;
              }
              if (StringUtils.equals(v.getDisplayName(), value)) {
                  return FormValidation.warning(Messages.View_DisplayNameNotUniqueWarning(value));
              }
          }
          return FormValidation.ok();
      }