Ticket #29454: 29454.2.patch

wp-includes/comment-template.php

@@ -1255 +1255 @@
                 echo $home . '/' . $wpcommentspopupfile . '?comments_popup=' . $id;
                 echo '" onclick="wpopen(this.href); return false"';
         } else { // if comments_popup_script() is not in the template, display simple comment link
-                if ( 0 == $number )
-                        echo get_permalink() . '#respond';
-                else
+                if ( 0 == $number ) {
+                        /**
+                         * Filter the respond link when a post has no comments.
+                         *
+                         * @since 4.1.0
+                         *
+                         * @param string $respond_link The default response link.
+                         * @param integer $id The post ID.
+                         */
+                        $respond_link = get_permalink() . '#respond';
+                        echo apply_filters( 'respond_link', $respond_link, $id );
+                } else {
                         comments_link();
+                }
                 echo '"';
         }