FEATURE: Merge tagging plugin into core

lib/post_creator.rb

@@ -147,6 +147,7 @@ class PostCreator
       track_latest_on_category
       enqueue_jobs
       BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
+      auto_notify_for_tags
 
       trigger_after_events(@post)
 
@@ -437,6 +438,15 @@ class PostCreator
     PostJobsEnqueuer.new(@post, @topic, new_topic?, {import_mode: @opts[:import_mode]}).enqueue_jobs
   end
 
+  def auto_notify_for_tags
+    tags = DiscourseTagging.tags_for_saving(@opts[:tags], @guardian)
+    if tags.present?
+      @topic.custom_fields.update(DiscourseTagging::TAGS_FIELD_NAME => tags)
+      @topic.save
+      DiscourseTagging.auto_notify_for(tags, @topic)
+    end
+  end
+
   def new_topic?
     @opts[:topic_id].blank?
   end