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

Conflicts:
	app/models/status.rb
	db/migrate/20180528141303_fix_accounts_unique_index.rb
	db/schema.rb

Resolved by taking upstream changes (no real conflicts, just glitch-soc
specific code too close to actual changes).

app/lib/activitypub/activity/follow.rb

@@ -13,7 +13,7 @@ class ActivityPub::Activity::Follow < ActivityPub::Activity
 
     # Fast-forward repeat follow requests
     if @account.following?(target_account)
-      AuthorizeFollowService.new.call(@account, target_account, skip_follow_request: true)
+      AuthorizeFollowService.new.call(@account, target_account, skip_follow_request: true, follow_request_uri: @json['id'])
       return
     end
 

app/lib/activitypub/activity/undo.rb

@@ -5,6 +5,8 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
     case @object['type']
     when 'Announce'
       undo_announce
+    when 'Accept'
+      undo_accept
     when 'Follow'
       undo_follow
     when 'Like'
@@ -27,6 +29,10 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
     end
   end
 
+  def undo_accept
+    ::Follow.find_by(target_account: @account, uri: target_uri)&.revoke_request!
+  end
+
   def undo_follow
     target_account = account_from_uri(target_uri)