Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/services/post_status_service.rb
  Small conflict due to handling of instance-local toots.
  A subsequent change is required to ensure instance-local polls are not leaked
  through Update.

app/serializers/rest/notification_serializer.rb

@@ -11,6 +11,6 @@ class REST::NotificationSerializer < ActiveModel::Serializer
   end
 
   def status_type?
-    [:favourite, :reblog, :mention].include?(object.type)
+    [:favourite, :reblog, :mention, :poll].include?(object.type)
   end
 end