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Date: Fri, 6 Mar 2020 17:46:34 +0100 (CET)
From: Tom Hirschowitz <tom.hirschowitz@univ-smb.fr>
To: David Bremner <david@tethera.net>
Cc: Notmuch Mail <notmuch@notmuchmail.org>
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Subject: Re: oldest-first
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Thanks for your answer.

This is indeed not a bug then. It's not important, but my preferred sort order would be the opposite of newest-first.
I prefer seeing older threads first, but often find myself missing recent messages in threads because they have older unread messages hence are considered old. 

Tom