Ticket #6534: link-template.php.diff

link-template.php

@@ -179 +179 @@
                         $parentlink = _get_page_link( $object->post_parent ); // Ignores page_on_front
                 else
                         $parentlink = get_permalink( $object->post_parent );
-                if ( ctype_digit($object->post_name) || false !== strpos(get_option('permalink_structure'), '%category%') )
+                if ( is_numeric($object->post_name) || false !== strpos(get_option('permalink_structure'), '%category%') )
                         $name = 'attachment/' . $object->post_name; // <permalink>/<int>/ is paged so we use the explicit attachment marker
                 else
                         $name = $object->post_name;