From: Tom Hughes <tom@compton.nu>
Date: Thu, 2 Jan 2020 18:47:14 +0000 (+0000)
Subject: Set X-Entity-Ref-ID header on notification emails
X-Git-Tag: live~2270
X-Git-Url: https://git.openstreetmap.org/rails.git/commitdiff_plain/6c22bf4b9afb26af56430ec9f9e191502fb0ee60

Set X-Entity-Ref-ID header on notification emails

This disables threading in gmail completely - without it all
notifications of a given type are grouped together.
---

diff --git a/app/mailers/notifier.rb b/app/mailers/notifier.rb
index 1d33db9d8..c60dff84b 100644
--- a/app/mailers/notifier.rb
+++ b/app/mailers/notifier.rb
@@ -218,7 +218,9 @@ class Notifier < ApplicationMailer
 
   def set_references(scope, reference_object)
     ref = "osm-#{scope}-#{reference_object.id}@#{Settings.server_url}"
+
+    headers["X-Entity-Ref-ID"] = ref
     headers["In-Reply-To"] = ref
-    headers["References"]  = ref
+    headers["References"] = ref
   end
 end