Allow temp-oauth-email as notification email

CHANGELOG

@@ -18,6 +18,7 @@ v 8.7.0 (unreleased)
 v 8.6.3 (unreleased)
   - Destroy related todos when an Issue/MR is deleted. !3376
   - Fix error 500 when target is nil on todo list. !3376
+  - Allow temporary email as notification email. !TBD
 
 v 8.6.2
   - Fix dropdown alignment. !3298

app/models/user.rb

@@ -408,6 +408,8 @@ class User < ActiveRecord::Base
   end
 
   def owns_notification_email
+    return if self.temp_oauth_email?
+
     self.errors.add(:notification_email, "is not an email you own") unless self.all_emails.include?(self.notification_email)
   end
 

spec/models/user_spec.rb

@@ -173,6 +173,13 @@ describe User, models: true do
           expect(user).to be_invalid
         end
       end
+
+      context 'owns_notification_email' do
+        it 'accepts temp_oauth_email emails' do
+          user = build(:user, email: "temp-email-for-oauth@example.com")
+          expect(user).to be_valid
+        end
+      end
     end
   end