From 7e90d3a450795219ffe45daa21db436054e368e8 Mon Sep 17 00:00:00 2001
From: Sam Hemelryk <sam@moodle.com>
Date: Thu, 27 Jan 2011 15:54:11 +0800
Subject: [PATCH] navigation MDL-25291 Added a session variable so that admin
 tree is skipped if it is found to be empty.

---
 lib/navigationlib.php | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/navigationlib.php b/lib/navigationlib.php
index 3a62e6a9c9c..795246fa3d9 100644
--- a/lib/navigationlib.php
+++ b/lib/navigationlib.php
@@ -2537,7 +2537,7 @@ class settings_navigation extends navigation_node {
      *
      */
     public function initialise() {
-        global $DB;
+        global $DB, $SESSION;
 
         if (during_initial_install()) {
             return false;
@@ -2581,7 +2581,13 @@ class settings_navigation extends navigation_node {
         }
 
         $settings = $this->load_user_settings($this->page->course->id);
-        $admin = $this->load_administration_settings();
+
+        if (isloggedin() && !isguestuser() && (!property_exists($SESSION, 'load_navigation_admin') || $SESSION->load_navigation_admin)) {
+            $admin = $this->load_administration_settings();
+            $SESSION->load_navigation_admin = ($admin->has_children());
+        } else {
+            $admin = false;
+        }
 
         if ($context->contextlevel == CONTEXT_SYSTEM && $admin) {
             $admin->force_open();
@@ -2598,8 +2604,6 @@ class settings_navigation extends navigation_node {
             $this->add(get_string('returntooriginaluser', 'moodle', fullname($realuser, true)), $url, self::TYPE_SETTING, null, null, new pix_icon('t/left', ''));
         }
 
-        // Make sure the first child doesnt have proceed with hr set to true
-
         foreach ($this->children as $key=>$node) {
             if ($node->nodetype != self::NODETYPE_BRANCH || $node->children->count()===0) {
                 $node->remove();