From 09da042b360f7156673a681578483d173b7ccd4e Mon Sep 17 00:00:00 2001
From: Sam Hemelryk <sam@moodle.com>
Date: Thu, 27 Jun 2013 10:05:35 +1200
Subject: [PATCH] MDL-40344 navigation: expandable branch id is now properly
 unique

---
 lib/navigationlib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/navigationlib.php b/lib/navigationlib.php
index 72db6669061..378e9f0fbb4 100644
--- a/lib/navigationlib.php
+++ b/lib/navigationlib.php
@@ -589,7 +589,7 @@ class navigation_node implements renderable {
     public function find_expandable(array &$expandable) {
         foreach ($this->children as &$child) {
             if ($child->display && $child->has_children() && $child->children->count() == 0) {
-                $child->id = 'expandable_branch_'.(count($expandable)+1);
+                $child->id = 'expandable_branch_'.$child->type.'_'.clean_param($child->key, PARAM_ALPHANUMEXT);
                 $this->add_class('canexpand');
                 $expandable[] = array('id' => $child->id, 'key' => $child->key, 'type' => $child->type);
             }