GNU bug report logs - #64439
28.2; auto-fill-mode gets turned on all over the place

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Package: emacs;

Reported by: David Howells <dhowells <at> redhat.com>

Date: Mon, 3 Jul 2023 15:57:02 UTC

Severity: normal

Found in version 28.2

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From: Jim Porter <jporterbugs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: dhowells <at> redhat.com, 64439 <at> debbugs.gnu.org, michael.albinus <at> gmx.de, npostavs <at> gmail.com, monnier <at> iro.umontreal.ca
Subject: bug#64439: 28.2; auto-fill-mode gets turned on all over the place
Date: Tue, 11 Jul 2023 09:07:22 -0700

On 7/11/2023 4:31 AM, Eli Zaretskii wrote:
>> Date: Mon, 10 Jul 2023 16:53:41 -0700
>> From: Jim Porter <jporterbugs <at> gmail.com>
>> Cc: dhowells <at> redhat.com, Michael Albinus <michael.albinus <at> gmx.de>,
>>   64439 <at> debbugs.gnu.org, Noam Postavsky <npostavs <at> gmail.com>
>>
>> On 7/10/2023 2:54 PM, Jim Porter wrote:
>>> Interestingly, I can't reproduce this on Emacs 30 (latest master), but I
>>> *can* on Emacs 28.2 and the latest rev on the Emacs 29 branch. I haven't
>>> dug any further yet to see which commit could have changed this though.
>>
>> ... and it looks like you're the one who fixed this, Stefan! Should this
>> get backported into the emacs-29 branch?
> 
> Sorry, no.  We've lived with this subtle problem for 40 years, we can
> live another one or two.

Ok, just thought I'd ask. It's not too hard to work around anyway.

For anyone who's interested, here's what I did to work around the bug in 
Emacs 29 and earlier:

--------------------

(use-package text-mode
  :preface
  (defun user/turn-on-auto-fill (&optional recursive)
    "Turn on `auto-fill-mode', but fix things if it got set globally.
See <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=64439>."
    (turn-on-auto-fill)
    (when (default-value 'auto-fill-function)
      (message "`auto-fill-function' got set globally; fixing it...")
      (setq-default auto-fill-function nil)
      (when recursive
        (error (concat "Recursively setting the default value of "
                       "`auto-fill-function'!")))
      (run-with-timer 0 nil
                      (lambda (buf)
                        (with-current-buffer buf
                          (user/turn-on-auto-fill)))
                      (current-buffer))))

  :init
  (add-hook 'text-mode-hook (if (< emacs-major-version 30)
                                #'user/turn-on-auto-fill
                              #'turn-on-auto-fill)))
This bug report was last modified 1 year and 344 days ago.

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