mrsdizzie 944d904980 Include thread related headers in issue/coment mail (#7484) ...

* Include thread related headers in issue/coment mail

Make it so mail programs will group comments from an issue into the same
thread by setting Message-ID on initial issue and then using In-Reply-To
and References headers to reference that later on.

* Add tests

* more tests

* fix typo

2019-07-17 15:02:42 -04:00

6.8 KiB

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