activitypub: tag manager: ensure that a quote post has the OP included in to field

app/lib/activitypub/tag_manager.rb

@@ -77,11 +77,15 @@ class ActivityPub::TagManager
   # Unlisted and private statuses go out primarily to the followers collection
   # Others go out only to the people they mention
   def to(status)
+    to = []
+
+    to << uri_for(status.quote.account) if status.quote?
+
     case status.visibility
     when 'public'
-      [COLLECTIONS[:public]]
+      to << COLLECTIONS[:public]
     when 'unlisted', 'private'
-      [account_followers_url(status.account)]
+      to << account_followers_url(status.account)
     when 'direct', 'limited'
       if status.account.silenced?
         # Only notify followers if the account is locally silenced