GNU bug report logs - #13817
24.3.50; Disabling whitespace-mode that was enabled in sgml-mode-hook breaks font-lock

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13817: closed (24.3.50; Disabling whitespace-mode that was
 enabled in sgml-mode-hook breaks font-lock)
Date: Tue, 19 Mar 2013 05:11:02 +0000

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Your message dated Tue, 19 Mar 2013 09:09:00 +0400
with message-id <5147F2EC.4060102 <at> yandex.ru>
and subject line Re: bug#13817: 24.3.50; Disabling whitespace-mode that was enabled in sgml-mode-hook breaks font-lock
has caused the debbugs.gnu.org bug report #13817,
regarding 24.3.50; Disabling whitespace-mode that was enabled in sgml-mode-hook breaks font-lock
to be marked as done.

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50;
	Disabling whitespace-mode that was enabled in sgml-mode-hook breaks
	font-lock
Date: Tue, 26 Feb 2013 10:29:13 +0400

Revno 111881 fixed the obvious problem with whitespace-mode, here's a
less obvious one.

This seems to be localized to sgml-mode and its derivatives so far:
js-mode, ruby-mode, etc are not affected.

1. (add-hook 'sgml-mode-hook 'whitespace-mode)
2. Open a file in sgml-mode or html-mode, or create a buffer and turn
either mode manually. whitespace-mode will be enabled.
3. M-x whitespace-mode => it's disabled, font-lock is gone, the value of
font-lock-keywords is (t nil).

On the surface, the reason for this is that when whitespace-mode is being
turned on in the hook, font-lock-keywords is still nil, and so nil is
saved in whitespace-font-lock-keywords.

In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.6.0)
 of 2013-02-26 on vbx
Bzr revision: 111882 eggert <at> cs.ucla.edu-20130226030908-c65ivknn1bm5hjru
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
System Description:	Ubuntu 12.10

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 13817-done <at> debbugs.gnu.org
Subject: Re: bug#13817: 24.3.50; Disabling whitespace-mode that was enabled
	in sgml-mode-hook breaks font-lock
Date: Tue, 19 Mar 2013 09:09:00 +0400

Version: 24.4

On 18.03.2013 2:30, Stefan Monnier wrote:
>> On the surface, the reason for this is that when whitespace-mode is being
>> turned on in the hook, font-lock-keywords is still nil, and so nil is
>> saved in whitespace-font-lock-keywords.
>
> whitespace.el should probably use font-lock-remove-keywords instead.

That helped, thank you.

I left the disabling/enabling of font-lock-mode there, because otherwise 
the changes in highlighting are not visible until the buffer is modified.

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