Ticket #16992: comments.patch

class-wp-comments-list-table.php

@@ -255 +255 @@
                 if ( !$post_id )
                         $columns['response'] = _x( 'In Response To', 'column name' );
 
+                $columns = apply_filters( 'manage_comments_custom_columns', $columns );
+                
                 return $columns;
         }