Fix email thread

[hanachin]

In Redmine 4.1, Message-ID and References contains user_id that passed to mailer methods.

Committed the patch. The new Message-ID formats are as follows:

Issue added:

Message-Id: redmine.issue-#{issue.id}.#{issue.created_on}.#{user_id}@example.net

Issue updated:

Message-Id: redmine.journal-#{jounal.id}.#{journal.created_on}.#{user_id}@example.net References: redmine.issue-#{issue.id}.#{issue.created_on}.#{user_id}@example.net https://www.redmine.org/issues/17096

To fix email thread, pass the same user (issue.author) to mailer methods.

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[hanachin]

mame wrote in ruby-jp Slack #redmine channel:

雑に質問してしまうんですが、たぶん↓の影響で bugs.ruby-lang.org からの通知メールがスレッドにならなくなっているような気がしています。これって既知ですか？ https://www.redmine.org/issues/17096 http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/97088 のメールのヘッダは Message-ID: redmine.issue-16615.20200207121817.12922@ruby-lang.org References: redmine.issue-16615.20200207121817.12922@ruby-lang.org になっていて、それに対するレスの http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/97089 のメールは Message-ID: redmine.journal-84195.20200207124837.3414@ruby-lang.org References: redmine.issue-16615.20200207121817.3414@ruby-lang.org になっています（blade だとメールヘッダみえないですが） 12922 と 3414 のところが違っていて、この番号はどうやらredmineに投稿した人の user id のようです https://bugs.ruby-lang.org/users/12922 https://bugs.ruby-lang.org/users/3414

[hsbt]

Thanks!