Make discussion mail References all notes in the discussion

When a note is part of a discussion, the email sent out will be
`In-Reply-To` the previous note in that discussion. It also
`References` all the previous notes in that discussion, and the
original issue.

Closes gitlab-org/gitlab-ce#36054.

1 files changed, 5 insertions, 4 deletions

diff --git a/app/models/note.rb b/app/models/note.rb
index ea31bc45c61..184fbd5f5ae 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -360,13 +360,14 @@ class Note < ActiveRecord::Base
     end
   end
 
-  def replies_to
+  def references
+    refs = [noteable]
+
     if part_of_discussion?
-      previous_note = discussion.notes.take_while { |n| n.id < id }.last
-      return previous_note if previous_note
+      refs += discussion.notes.take_while { |n| n.id < id }
     end
 
-    noteable
+    refs
   end
 
   def expire_etag_cache