Ticket #22889: 22889.3.patch

wp-includes/comment-template.php

@@ -1437 +1437 @@
                         $args['add_below'], $comment->comment_ID, $args['respond_id'], $post->ID
                 );
 
-                $link = sprintf( "<a class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
+                $link = sprintf( "<a rel='nofollow' class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
                         esc_url( add_query_arg( 'replytocom', $comment->comment_ID, get_permalink( $post->ID ) ) ) . "#" . $args['respond_id'],
                         $onclick,
                         esc_attr( sprintf( $args['reply_to_text'], $comment->comment_author ) ),