GNU bug report logs - #68352
29.1; gnus-message-citation-mode removes values from font-lock-keywords

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Tue, 09 Jan 2024 20:18:37 +0000

When Gnus enables gnus-message-citation-mode in message buffers, as it
does by default, it calls the function `font-lock-set-defaults' and
loses any additional font-lock rules which may have been added by global
minor-modes.

The best example to demonstrate the problem is by enabling
global-whitespace-mode.  The font-lock rules for whitespace are lost
when gnus-message-citation-mode is enabled, which means that
global-whitespace-mode will work correctly in plain message buffers, but
will appear to be broken in message buffers opened by Gnus.

Example for use with emacs -Q:

  (require 'gnus-cite)
  (require 'whitespace)

  (add-function :before-until whitespace-enable-predicate
                (lambda () (eq major-mode 'message-mode)))
  (global-whitespace-mode)
  (compose-mail)
  ;; Whitespace font-lock rules are present in `font-lock-keywords' at
  ;; this point.
  (gnus-message-citation-mode)
  ;; `font-lock-keywords' has now been reset, and the font-lock rules
  ;; for citations are added, but the whitespace font-lock rules have
  ;; been lost.



In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw3d scroll bars) of 2023-07-31 built on inspiron
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure --with-native-compilation --with-cairo --with-json
 --with-xml2 --with-x-toolkit=lucid'

Configured features:
CAIRO FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XAW3D
XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Org-Agenda Week Ddl Grid

Minor modes in effect:
  server-mode: t
  global-corfu-mode: t
  corfu-mode: t
  jabber-activity-mode: t
  which-key-mode: t
  global-devil-mode: t
  devil-mode: t
  global-whitespace-mode: t
  erc-spelling-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  minibuffer-depth-indicate-mode: t
  ido-everywhere: t
  recentf-mode: t
  shell-dirtrack-mode: t
  global-hl-line-mode: t
  display-time-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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-- 
Morgan Willcock

Message #8 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: Morgan Willcock <morgan <at> ice9.digital>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Tue, 09 Jan 2024 13:44:10 -0800

Morgan Willcock <morgan <at> ice9.digital> writes:

> When Gnus enables gnus-message-citation-mode in message buffers, as it
> does by default, it calls the function `font-lock-set-defaults' and
> loses any additional font-lock rules which may have been added by global
> minor-modes.

Thanks for the report. I don't know font locking well enough to know
what the right solution is here. It looks calling `font-lock-flush' will
also end up calling `font-lock-set-defaults' as well, at least with
default values:

font-lock-flush-function ->
font-lock-after-change-function ->
font-lock-fontify-region ->
font-lock-set-defaults

Is the problem setting `font-lock-set-defaults' to nil? Is there
anything else you can recommend?

Thanks,
Eric

Message #11 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Tue, 09 Jan 2024 22:21:18 +0000

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> Morgan Willcock <morgan <at> ice9.digital> writes:
>
>> When Gnus enables gnus-message-citation-mode in message buffers, as it
>> does by default, it calls the function `font-lock-set-defaults' and
>> loses any additional font-lock rules which may have been added by global
>> minor-modes.
>
> Thanks for the report. I don't know font locking well enough to know
> what the right solution is here. It looks calling `font-lock-flush' will
> also end up calling `font-lock-set-defaults' as well, at least with
> default values:
>
> font-lock-flush-function ->
> font-lock-after-change-function ->
> font-lock-fontify-region ->
> font-lock-set-defaults
>
> Is the problem setting `font-lock-set-defaults' to nil? Is there
> anything else you can recommend?

I think that I did test not setting `font-lock-set-defaults' to nil to
see if that made a difference, but the same problem was still there.

I don't know very much myself, but in that section of code there is a
comment left by Stefan Monnier:

  ;; FIXME: Use font-lock-add-keywords!

So I would guess that the correct solution would be to add the citation
font-locking rules with `font-lock-add-keywords' and then remove them
again with `font-lock-remove-keywords' if the mode is ever disabled, and
if the highlighting needs an update after those changes, call
`font-lock-flush'.

(When testing I'm not seeing that a call to `font-lock-flush' will lose
any values from `font-lock-keywords'.)

-- 
Morgan Willcock

Message #14 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: Morgan Willcock <morgan <at> ice9.digital>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Tue, 09 Jan 2024 21:25:15 -0800

Morgan Willcock <morgan <at> ice9.digital> writes:

> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>
>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>
>>> When Gnus enables gnus-message-citation-mode in message buffers, as it
>>> does by default, it calls the function `font-lock-set-defaults' and
>>> loses any additional font-lock rules which may have been added by global
>>> minor-modes.
>>
>> Thanks for the report. I don't know font locking well enough to know
>> what the right solution is here. It looks calling `font-lock-flush' will
>> also end up calling `font-lock-set-defaults' as well, at least with
>> default values:
>>
>> font-lock-flush-function ->
>> font-lock-after-change-function ->
>> font-lock-fontify-region ->
>> font-lock-set-defaults
>>
>> Is the problem setting `font-lock-set-defaults' to nil? Is there
>> anything else you can recommend?
>
> I think that I did test not setting `font-lock-set-defaults' to nil to
> see if that made a difference, but the same problem was still there.
>
> I don't know very much myself, but in that section of code there is a
> comment left by Stefan Monnier:
>
>   ;; FIXME: Use font-lock-add-keywords!

Ha, my eyes went right by that comment.

> So I would guess that the correct solution would be to add the citation
> font-locking rules with `font-lock-add-keywords' and then remove them
> again with `font-lock-remove-keywords' if the mode is ever disabled, and
> if the highlighting needs an update after those changes, call
> `font-lock-flush'.

So maybe this is enough?

(define-minor-mode gnus-message-citation-mode
  "Minor mode providing more font-lock support for nested citations.
When enabled, it automatically turns on `font-lock-mode'."
  :lighter ""
  (when (derived-mode-p 'message-mode)
    (if gnus-message-citation-mode
	(font-lock-add-keywords nil gnus-message-citation-keywords)
      (font-lock-remove-keywords nil gnus-message-citation-keywords))
    (if font-lock-mode
	(font-lock-flush)
      (gnus-message-citation-mode (font-lock-mode 1)))))

Message #17 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: Morgan Willcock <morgan <at> ice9.digital>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Wed, 10 Jan 2024 07:21:38 -0800

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> Morgan Willcock <morgan <at> ice9.digital> writes:
>
>> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>>
>>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>>
>>>> When Gnus enables gnus-message-citation-mode in message buffers, as it
>>>> does by default, it calls the function `font-lock-set-defaults' and
>>>> loses any additional font-lock rules which may have been added by global
>>>> minor-modes.
>>>
>>> Thanks for the report. I don't know font locking well enough to know
>>> what the right solution is here. It looks calling `font-lock-flush' will
>>> also end up calling `font-lock-set-defaults' as well, at least with
>>> default values:
>>>
>>> font-lock-flush-function ->
>>> font-lock-after-change-function ->
>>> font-lock-fontify-region ->
>>> font-lock-set-defaults
>>>
>>> Is the problem setting `font-lock-set-defaults' to nil? Is there
>>> anything else you can recommend?
>>
>> I think that I did test not setting `font-lock-set-defaults' to nil to
>> see if that made a difference, but the same problem was still there.
>>
>> I don't know very much myself, but in that section of code there is a
>> comment left by Stefan Monnier:
>>
>>   ;; FIXME: Use font-lock-add-keywords!
>
> Ha, my eyes went right by that comment.
>
>> So I would guess that the correct solution would be to add the citation
>> font-locking rules with `font-lock-add-keywords' and then remove them
>> again with `font-lock-remove-keywords' if the mode is ever disabled, and
>> if the highlighting needs an update after those changes, call
>> `font-lock-flush'.
>
> So maybe this is enough?
>
> (define-minor-mode gnus-message-citation-mode
>   "Minor mode providing more font-lock support for nested citations.
> When enabled, it automatically turns on `font-lock-mode'."
>   :lighter ""
>   (when (derived-mode-p 'message-mode)
>     (if gnus-message-citation-mode
> 	(font-lock-add-keywords nil gnus-message-citation-keywords)
>       (font-lock-remove-keywords nil gnus-message-citation-keywords))
>     (if font-lock-mode
> 	(font-lock-flush)
>       (gnus-message-citation-mode (font-lock-mode 1)))))

No, that doesn't do it. The thing is, even if you defuse this minor mode
entirely (I replaced the body with `(message "Whee!")'),
global-whitespace-mode has already been overridden by the time we come
to run this minor-mode function. It's already getting clobbered at some
earlier point.

Message #20 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: Morgan Willcock <morgan <at> ice9.digital>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Wed, 10 Jan 2024 10:51:49 -0800

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>
>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>
>>> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>>>
>>>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>>>
>>>>> When Gnus enables gnus-message-citation-mode in message buffers, as it
>>>>> does by default, it calls the function `font-lock-set-defaults' and
>>>>> loses any additional font-lock rules which may have been added by global
>>>>> minor-modes.
>>>>
>>>> Thanks for the report. I don't know font locking well enough to know
>>>> what the right solution is here. It looks calling `font-lock-flush' will
>>>> also end up calling `font-lock-set-defaults' as well, at least with
>>>> default values:
>>>>
>>>> font-lock-flush-function ->
>>>> font-lock-after-change-function ->
>>>> font-lock-fontify-region ->
>>>> font-lock-set-defaults
>>>>
>>>> Is the problem setting `font-lock-set-defaults' to nil? Is there
>>>> anything else you can recommend?
>>>
>>> I think that I did test not setting `font-lock-set-defaults' to nil to
>>> see if that made a difference, but the same problem was still there.
>>>
>>> I don't know very much myself, but in that section of code there is a
>>> comment left by Stefan Monnier:
>>>
>>>   ;; FIXME: Use font-lock-add-keywords!
>>
>> Ha, my eyes went right by that comment.
>>
>>> So I would guess that the correct solution would be to add the citation
>>> font-locking rules with `font-lock-add-keywords' and then remove them
>>> again with `font-lock-remove-keywords' if the mode is ever disabled, and
>>> if the highlighting needs an update after those changes, call
>>> `font-lock-flush'.
>>
>> So maybe this is enough?
>>
>> (define-minor-mode gnus-message-citation-mode
>>   "Minor mode providing more font-lock support for nested citations.
>> When enabled, it automatically turns on `font-lock-mode'."
>>   :lighter ""
>>   (when (derived-mode-p 'message-mode)
>>     (if gnus-message-citation-mode
>> 	(font-lock-add-keywords nil gnus-message-citation-keywords)
>>       (font-lock-remove-keywords nil gnus-message-citation-keywords))
>>     (if font-lock-mode
>> 	(font-lock-flush)
>>       (gnus-message-citation-mode (font-lock-mode 1)))))
>
> No, that doesn't do it. The thing is, even if you defuse this minor mode
> entirely (I replaced the body with `(message "Whee!")'),
> global-whitespace-mode has already been overridden by the time we come
> to run this minor-mode function. It's already getting clobbered at some
> earlier point.

Actually, it might just be that something about message-mode suppresses
whitespace-mode altogether. Even if I turn it on *after* starting a
reply, no font-locking of whitespace is done.

Message #23 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Wed, 10 Jan 2024 19:20:15 +0000

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>
>> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>>
>>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>>
>>>> Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:
>>>>
>>>>> Morgan Willcock <morgan <at> ice9.digital> writes:
>>>>>
>>>>>> When Gnus enables gnus-message-citation-mode in message buffers, as it
>>>>>> does by default, it calls the function `font-lock-set-defaults' and
>>>>>> loses any additional font-lock rules which may have been added by global
>>>>>> minor-modes.
>>>>>
>>>>> Thanks for the report. I don't know font locking well enough to know
>>>>> what the right solution is here. It looks calling `font-lock-flush' will
>>>>> also end up calling `font-lock-set-defaults' as well, at least with
>>>>> default values:
>>>>>
>>>>> font-lock-flush-function ->
>>>>> font-lock-after-change-function ->
>>>>> font-lock-fontify-region ->
>>>>> font-lock-set-defaults
>>>>>
>>>>> Is the problem setting `font-lock-set-defaults' to nil? Is there
>>>>> anything else you can recommend?
>>>>
>>>> I think that I did test not setting `font-lock-set-defaults' to nil to
>>>> see if that made a difference, but the same problem was still there.
>>>>
>>>> I don't know very much myself, but in that section of code there is a
>>>> comment left by Stefan Monnier:
>>>>
>>>>   ;; FIXME: Use font-lock-add-keywords!
>>>
>>> Ha, my eyes went right by that comment.
>>>
>>>> So I would guess that the correct solution would be to add the citation
>>>> font-locking rules with `font-lock-add-keywords' and then remove them
>>>> again with `font-lock-remove-keywords' if the mode is ever disabled, and
>>>> if the highlighting needs an update after those changes, call
>>>> `font-lock-flush'.
>>>
>>> So maybe this is enough?
>>>
>>> (define-minor-mode gnus-message-citation-mode
>>>   "Minor mode providing more font-lock support for nested citations.
>>> When enabled, it automatically turns on `font-lock-mode'."
>>>   :lighter ""
>>>   (when (derived-mode-p 'message-mode)
>>>     (if gnus-message-citation-mode
>>> 	(font-lock-add-keywords nil gnus-message-citation-keywords)
>>>       (font-lock-remove-keywords nil gnus-message-citation-keywords))
>>>     (if font-lock-mode
>>> 	(font-lock-flush)
>>>       (gnus-message-citation-mode (font-lock-mode 1)))))
>>
>> No, that doesn't do it. The thing is, even if you defuse this minor mode
>> entirely (I replaced the body with `(message "Whee!")'),
>> global-whitespace-mode has already been overridden by the time we come
>> to run this minor-mode function. It's already getting clobbered at some
>> earlier point.
>
> Actually, it might just be that something about message-mode suppresses
> whitespace-mode altogether. Even if I turn it on *after* starting a
> reply, no font-locking of whitespace is done.

I haven't had a chance to re-test anything yet (I'm fairly sure that
removing the call to `font-lock-set-defaults' kept the whitespace
font-lock rules in-place), but if you are seeing issues with
whitespace-mode being turned on then it is probably because the value of
`whitespace-enable-predicate' has not been modified.

Because of the default predicate value, whitespace-mode does not apply
to any buffer where the name begins with an asterisk (with the exception
of the scratch buffer), and the message buffer is usually named
something like "*unsent mail*".  That is why the example to recreate the
problem needed a change to the predicate value:

  (add-function :before-until whitespace-enable-predicate
                (lambda () (eq major-mode 'message-mode)))

This might look a bit like I've hacked my way into creating the problem
that I'm reporting, but this is actually what the docstring for the
value instructs you to do to change the behaviour, and I don't think any
of the default restrictions are there to avoid font-lock problems.

-- 
Morgan Willcock

Message #26 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Wed, 10 Jan 2024 22:16:27 +0000

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> So maybe this is enough?
>
> (define-minor-mode gnus-message-citation-mode
>   "Minor mode providing more font-lock support for nested citations.
> When enabled, it automatically turns on `font-lock-mode'."
>   :lighter ""
>   (when (derived-mode-p 'message-mode)
>     (if gnus-message-citation-mode
> 	(font-lock-add-keywords nil gnus-message-citation-keywords)
>       (font-lock-remove-keywords nil gnus-message-citation-keywords))
>     (if font-lock-mode
> 	(font-lock-flush)
>       (gnus-message-citation-mode (font-lock-mode 1)))))

I think this does fix it, although I've added the optional argument to
append to the end of the font-lock rules and restored the comment which
suggested why it previously worked that way.

  (define-minor-mode gnus-message-citation-mode
    "Minor mode providing more font-lock support for nested citations.
  When enabled, it automatically turns on `font-lock-mode'."
    :lighter ""
    (when (derived-mode-p 'message-mode)
      (if gnus-message-citation-mode
          ;; `gnus-message-citation-keywords' should be the last
          ;; elements of the keywords because the others are unlikely to
          ;; have the OVERRIDE flags -- XEmacs applies a keyword having
          ;; no OVERRIDE flag to matched text even if it has already
          ;; other faces, while Emacs doesn't.
          (font-lock-add-keywords nil gnus-message-citation-keywords t)
        (font-lock-remove-keywords nil gnus-message-citation-keywords))
      (if font-lock-mode
          (font-lock-flush)
        (gnus-message-citation-mode (font-lock-mode 1)))))

-- 
Morgan Willcock

Message #29 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Morgan Willcock <morgan <at> ice9.digital>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Thu, 11 Jan 2024 11:57:36 +0000

[Message part 1 (text/plain, inline)]

I've attached a patch which is essentially the same as Eric's suggestion
except that, the original comment is kept, the HOW argument of
`font-lock-add-keywords' is set to t, and the code is restructured to
avoid any font-lock changes until `font-lock-mode' is active.

-- 
Morgan Willcock

[0001-Avoid-font-lock-reset-in-gnus-message-citation-mode.patch (text/x-diff, attachment)]

Message #32 received at 68352 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Morgan Willcock <morgan <at> ice9.digital>
Cc: eric <at> ericabrahamsen.net, 68352 <at> debbugs.gnu.org
Subject: Re: bug#68352: 29.1;
 gnus-message-citation-mode removes values from font-lock-keywords
Date: Sun, 11 Feb 2024 10:48:14 +0200

> Cc: 68352 <at> debbugs.gnu.org
> From: Morgan Willcock <morgan <at> ice9.digital>
> Date: Thu, 11 Jan 2024 11:57:36 +0000
> 
> I've attached a patch which is essentially the same as Eric's suggestion
> except that, the original comment is kept, the HOW argument of
> `font-lock-add-keywords' is set to t, and the code is restructured to
> avoid any font-lock changes until `font-lock-mode' is active.

Eric, how should we go about making some progress here?  Should the
proposed patch be installed?

Thanks.

Message #37 received at 68352-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Abrahamsen <eric <at> ericabrahamsen.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 68352-done <at> debbugs.gnu.org, Morgan Willcock <morgan <at> ice9.digital>
Subject: Re: bug#68352: 29.1; gnus-message-citation-mode removes values from
 font-lock-keywords
Date: Sun, 11 Feb 2024 06:49:36 -0800

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Cc: 68352 <at> debbugs.gnu.org
>> From: Morgan Willcock <morgan <at> ice9.digital>
>> Date: Thu, 11 Jan 2024 11:57:36 +0000
>> 
>> I've attached a patch which is essentially the same as Eric's suggestion
>> except that, the original comment is kept, the HOW argument of
>> `font-lock-add-keywords' is set to t, and the code is restructured to
>> avoid any font-lock changes until `font-lock-mode' is active.
>
> Eric, how should we go about making some progress here?  Should the
> proposed patch be installed?

It's already installed! I just neglected to close the bug, which I'm
doing now. Thanks for the bump.

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