Ticket #21891: 21891.patch

wp-includes/class-wp-theme.php

@@ -948 +948 @@
                 if ( $this->parent() )
                         $page_templates += $this->parent()->get_page_templates();
 
-                return $page_templates;
+                return apply_filters( 'page_templates', $page_templates, $this->get_stylesheet(), $this->get_template() );
         }
 
         /**