Ticket #38836: 38836.diff

src/wp-includes/nav-menu-template.php

@@ -431 +431 @@
                                 $classes[] = 'menu-item-home';
                 }
 
+                // Get an array of all public custom post types.
+                $post_types = get_post_types( array(
+                        'public'   => true,
+                        '_builtin' => false
+                ) );
+
+                // Check if a custom post type single item is being viewed.
+                if ( is_singular( $post_types ) ) {
+
+                        // Get the post type being viewed.
+                        $post_type = get_post_type();
+
+                        if ( $post_type === $menu_item->object ) {
+                                $classes[] = 'current_page_parent';
+                        }
+                }
+
                 // back-compat with wp_page_menu: add "current_page_parent" to static home page link for any non-page query
                 if ( ! empty( $home_page_id ) && 'post_type' == $menu_item->type && empty( $wp_query->is_page ) && $home_page_id == $menu_item->object_id )
                         $classes[] = 'current_page_parent';