Ticket #46747: 46747.diff

src/wp-includes/widgets/class-wp-widget-recent-comments.php

@@ -112 +112 @@
                         $output .= $args['before_title'] . $title . $args['after_title'];
                 }
 
-                $output .= '<ul id="recentcomments">';
+                $output .= '<ul id="' . $args['widget_id'] . '" class="recentcomments">';
                 if ( is_array( $comments ) && $comments ) {
                         // Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
                         $post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );