Resolve #2601030 "Views rss view"

Closes #2601030

core/modules/comment/src/Plugin/views/row/Rss.php

@@ -66,8 +66,7 @@ public function preRender($result) {
    */
   public function buildOptionsForm_summary_options() {
     $options = parent::buildOptionsForm_summary_options();
-    $options['title'] = $this->t('Title only');
-    $options['default'] = $this->t('Use site default RSS settings');
+    $options[$this::TITLE_VIEW_MODE] = $this->t('Title only');
     return $options;
   }
 
@@ -83,9 +82,6 @@ public function render($row) {
     }
 
     $view_mode = $this->options['view_mode'];
-    if ($view_mode == 'default') {
-      $view_mode = \Drupal::config('system.rss')->get('items.view_mode');
-    }
 
     // Load the specified comment and its associated node:
     /** @var \Drupal\comment\CommentInterface $comment */
@@ -113,7 +109,7 @@ public function render($row) {
 
     // The comment gets built and modules add to or modify
     // $comment->rss_elements and $comment->rss_namespaces.
-    $build = $this->entityTypeManager->getViewBuilder('comment')->view($comment, 'rss');
+    $build = $this->entityTypeManager->getViewBuilder('comment')->view($comment, $view_mode);
     unset($build['#theme']);
 
     if (!empty($comment->rss_namespaces)) {
@@ -121,7 +117,7 @@ public function render($row) {
     }
 
     $item = new \stdClass();
-    if ($view_mode != 'title') {
+    if ($view_mode != $this::TITLE_VIEW_MODE) {
       // We render comment contents.
       $item->description = $build;
     }