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Gnus does not find the thread root for some messages


From: Christoph Groth
Subject: Gnus does not find the thread root for some messages
Date: Wed, 30 Aug 2017 12:47:08 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Hello,

I have configured Gnus threading like this

(setq gnus-summary-make-false-root nil
      gnus-summary-thread-gathering-function 'gnus-gather-threads-by-references)
      
to be a bit stricter on what constitutes a thread.  This has been
working perfectly for zillions of messages.

However I noted recently that Gnus fails to identify the root message
for email notifications sent out by a certain "gitlab" server that I
use.  I can see that when I set gnus-summary-make-false-root to `dummy'.
Then the various replies are grouped around a dummy root, but the real
root message, while present, is not recognized.

For example the message containing the following headers

Message-ID: <address@hidden>
References: <address@hidden>
Subject: kwant | refer to PropagatingModes docstring from physics.leads.modes 
(!169)

is not identified correctly as the parent of the message containing the 
following

Message-ID: <address@hidden>
In-Reply-To: <address@hidden>
References: <address@hidden>
 <address@hidden>
Subject: Re: kwant | refer to PropagatingModes docstring from 
physics.leads.modes (!169)

Isn't this strange?  Everything seems to be set correctly.

Gnus' awesome configurability allows me to work around this problem by
setting gnus-summary-make-false-root to `adopt' and
gnus-summary-thread-gathering-function to
`gnus-gather-threads-by-subject' just for this group (using group
parameters).  But I would like to understand what's going on, especially
whether this is a bug in Gnus or in gitlab.

A quick unrelated question: Is this the famous address@hidden mailing list, or
a separate one?  Is address@hidden still active?

Christoph



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