From 6ee5e596b81e45088cb0f3efb32ed14829ecfd0b Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Mon, 6 Jun 2016 16:07:30 +0800
Subject: [PATCH 1/2] MDL-54837 tags: fixed bug when collection is locked

also fixed fatal error for upgraded plugins that did not pass tag
component to the tag form element
---
 lib/form/tags.php                        |  3 +++
 tag/classes/output/tagareacollection.php | 11 ++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/form/tags.php b/lib/form/tags.php
index 3a66e69b402..7f9bab6b74a 100644
--- a/lib/form/tags.php
+++ b/lib/form/tags.php
@@ -128,6 +128,9 @@ class MoodleQuickForm_tags extends MoodleQuickForm_autocomplete {
      */
     public function onQuickFormEvent($event, $arg, &$caller) {
         if ($event === 'createElement') {
+            if (!is_array($arg[2])) {
+                $arg[2] = [];
+            }
             $arg[2] += array('itemtype' => '', 'component' => '');
         }
         return parent::onQuickFormEvent($event, $arg, $caller);
diff --git a/tag/classes/output/tagareacollection.php b/tag/classes/output/tagareacollection.php
index cb845ad9482..a2928b7ee44 100644
--- a/tag/classes/output/tagareacollection.php
+++ b/tag/classes/output/tagareacollection.php
@@ -43,8 +43,17 @@ class tagareacollection extends \core\output\inplace_editable {
      * @param \stdClass $tagarea
      */
     public function __construct($tagarea) {
+        if (!empty($tagarea->locked)) {
+            // If the tag collection for the current tag area is locked, display the
+            // name of the collection without possibility to edit it.
+            $tagcoll = \core_tag_collection::get_by_id($tagarea->tagcollid);
+            parent::__construct('core_tag', 'tagareacollection', $tagarea->id, false,
+                \core_tag_collection::display_name($tagcoll), $tagarea->tagcollid);
+            return;
+        }
+
         $tagcollections = \core_tag_collection::get_collections_menu(true);
-        $editable = (count($tagcollections) > 1) && empty($tagarea->locked) &&
+        $editable = (count($tagcollections) > 1) &&
                 has_capability('moodle/tag:manage', context_system::instance());
         $areaname = core_tag_area::display_name($tagarea->component, $tagarea->itemtype);
         $edithint = new lang_string('edittagcollection', 'core_tag');

From 64e9180d2e88f224b35feabfb2f62973f121338c Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Tue, 7 Jun 2016 08:58:59 +0800
Subject: [PATCH 2/2] MDL-54837 tags: allow to specify static function as
 callback

---
 tag/classes/tag.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tag/classes/tag.php b/tag/classes/tag.php
index 26ee6905147..02d568bab71 100644
--- a/tag/classes/tag.php
+++ b/tag/classes/tag.php
@@ -1297,7 +1297,7 @@ class core_tag_tag {
                 require_once($CFG->dirroot . '/' . ltrim($tagarea->callbackfile, '/'));
             }
             $callback = $tagarea->callback;
-            return $callback($this, $exclusivemode, $fromctx, $ctx, $rec, $page);
+            return call_user_func_array($callback, [$this, $exclusivemode, $fromctx, $ctx, $rec, $page]);
         }
         return null;
     }