Merging from STABLE:

Fix for bug 3364:

The Great Global $course Hack strikes again. I had to put in another instance
of the hack for course themes to work in the "calendar" part of the course.

Hopefully some day we 'll do all that "correctly"! (search for "hack" in
weblib and despair).

calendar/event.php

@@ -248,6 +248,13 @@
         $nav = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$SESSION->cal_course_referer.'">'.$shortname.'</a> -> '.$nav;
     }
 
+    if (!empty($SESSION->cal_course_referer)) {
+        // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
+        $course = get_record('course', 'id', $SESSION->cal_course_referer);
+    } else {
+        $course = $site;
+    }
+
     print_header($site->shortname.': '.$strcalendar.': '.$title, $strcalendar, $nav.' -> '.$title,
                  $focus, '', true, '', user_login_string($site));
 
@@ -330,7 +337,9 @@
                     $form->minutes = '';
                 }
             }
-            if (!empty($form->courseid)) {       // Fixes bug 1488
+
+            if (!empty($form->courseid)) {
+                // TODO: This is part of the Great $course Hack in Moodle. Replace it at some point.
                 $course = get_record('course', 'id', $form->courseid);
             } else {
                 $course = $site;