Get rid of event subscribers that resolve services too early

Refs flarum/core#1578.

extensions/mentions/extend.php

@@ -9,10 +9,21 @@
  * file that was distributed with this source code.
  */
 
+use Flarum\Api\Event\WillSerializeData;
+use Flarum\Api\Serializer\PostSerializer;
+use Flarum\Event\ConfigureNotificationTypes;
+use Flarum\Event\ConfigurePostsQuery;
 use Flarum\Extend;
 use Flarum\Formatter\Event\Rendering;
 use Flarum\Mentions\ConfigureMentions;
 use Flarum\Mentions\Listener;
+use Flarum\Mentions\Notification\PostMentionedBlueprint;
+use Flarum\Mentions\Notification\UserMentionedBlueprint;
+use Flarum\Post\Event\Deleted;
+use Flarum\Post\Event\Hidden;
+use Flarum\Post\Event\Posted;
+use Flarum\Post\Event\Restored;
+use Flarum\Post\Event\Revised;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Contracts\View\Factory;
 
@@ -25,10 +36,23 @@ return [
         ->configure(ConfigureMentions::class),
 
     function (Dispatcher $events, Factory $views) {
+        $events->listen(WillSerializeData::class, Listener\FilterVisiblePosts::class);
         $events->subscribe(Listener\AddPostMentionedByRelationship::class);
-        $events->subscribe(Listener\UpdatePostMentionsMetadata::class);
-        $events->subscribe(Listener\UpdateUserMentionsMetadata::class);
-        $events->subscribe(Listener\AddFilterByMentions::class);
+
+        $events->listen(ConfigureNotificationTypes::class, function (ConfigureNotificationTypes $event) {
+            $event->add(PostMentionedBlueprint::class, PostSerializer::class, ['alert']);
+            $event->add(UserMentionedBlueprint::class, PostSerializer::class, ['alert']);
+        });
+        $events->listen(
+            [Posted::class, Restored::class, Revised::class],
+            Listener\UpdateMentionsMetadataWhenVisible::class
+        );
+        $events->listen(
+            [Deleted::class, Hidden::class],
+            Listener\UpdateMentionsMetadataWhenInvisible::class
+        );
+
+        $events->listen(ConfigurePostsQuery::class, Listener\AddFilterByMentions::class);
 
         $events->listen(Rendering::class, Listener\FormatPostMentions::class);
         $events->listen(Rendering::class, Listener\FormatUserMentions::class);