GNU bug report logs - #72532
[PATCH] ; lisp/progmodes/which-func.el (which-function-mode): check buffer

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Raffael Stocker <r.stocker <at> mnet-mail.de>
Cc: 72532 <at> debbugs.gnu.org
Subject: bug#72532: [PATCH] ; lisp/progmodes/which-func.el (which-function-mode): check buffer
Date: Fri, 09 Aug 2024 08:27:06 +0300

> From: Raffael Stocker <r.stocker <at> mnet-mail.de>
> Date: Thu, 08 Aug 2024 21:48:45 +0200
> 
> I have been getting "Selecting deleted buffer" errors recently when
> opening files.  This is due to ‘which-function-mode’ (in my
> prog-mode-hook) walking through (buffer-list) without checking for live
> buffers.
> 
> I have not been able to reproduce with ‘emacs -Q’, but it seems to be
> connected to eglot, as I see the problem only with eglot enabled.
> 
> Nevertheless, I would like to suggest the attached patch, if only to
> make which-function-mode more robust.

Thanks, but please show a couple of Lisp backtraces you get for this
error.  We'd like to be sure we are fixing the problem you report, not
some other problem.

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