GNU bug report logs - #79167
[PATCH] nnmbox-read-mbox: fix Xref header parsing

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jakub Ječmínek <kuba <at> kubajecminek.cz>
Cc: 79167 <at> debbugs.gnu.org
Subject: bug#79167: [PATCH] nnmbox-read-mbox: fix Xref header parsing
Date: Sat, 09 Aug 2025 15:31:19 +0300

> Date: Sun, 03 Aug 2025 15:48:37 +0200
> From:  Jakub Ječmínek via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> When opening an mbox file using the nnmbox backend, the `nnmbox-read-mbox'
> function parses it and, if the article is new, adds an 'X-Gnus-Newsgroup'
> header. This header is populated from the Xref header if the article includes
> one.
> 
> However, the search for Xref is broken. Steps to reproduce:
> 
> 0. Save the attached mbox file named '2016-11'
> 1. emacs -Q
> 2. (setq gnus-select-method '(nnmbox "" (nnmbox-mbox-file "/path/to/2016-11")))
> 3. M-x gnus RET
> 4. M-: (switch-to-buffer nnmbox-mbox-buffer) RET
> 5. Search for message with ID
> <36adb56e-5a51-4b07-9db2-188d4ce06abe <at> googlegroups.com>
> 
> You'll see this article contains two 'X-Gnus-Newsgroup' headers:
> 
> X-Gnus-Newsgroup: Wed, 02 Nov 2016 17:25   Sun Aug  3 15:15:26 2025  
> X-Gnus-Newsgroup: gnu.emacs.help:219001   Sun Aug  3 15:15:26 2025
> 
> The first line shouldn't be there because the Xref header contains just one
> group:
> 
> Xref: usenet.stanford.edu gnu.emacs.help:219001
> 
> The attached patch fixes this issue.

Thanks.  Can someone who's uses Gnus please review the patch and
report?

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