commit 1ec05c03bc5073346b8469c9d054c8a1ac63b490
Author: chessweb01 <selr@alice.de>
Date:   Tue Aug 1 12:39:00 2017 +0200

    Fix for  MDL-59663
    
    The fix makes sure that the category tree is initially collapsed.

diff --git a/course/renderer.php b/course/renderer.php
index accae17..3b517ec 100644
--- a/course/renderer.php
+++ b/course/renderer.php
@@ -1557,7 +1557,7 @@ class core_course_renderer extends plugin_renderer_base {
      * @return string
      */
     protected function coursecat_tree(coursecat_helper $chelper, $coursecat) {
-        $categorycontent = $this->coursecat_category_content($chelper, $coursecat, 0);
+        $categorycontent = $this->coursecat_category_content($chelper, $coursecat, 1);
         if (empty($categorycontent)) {
             return '';
         }