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From: David Bremner <david@tethera.net>
To: notmuch@notmuchmail.org
Subject: v1: fix for threading of replies to ghost messages
Date: Sat, 21 Jul 2018 08:37:37 +0900
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See the thread at id:87efgmmysi.fsf@len.workgroup for discussion.

This series finally bites the bullet and uses the References header
for threading.

Please test this series, there are lots of tricky cases with threading.