GNU bug report logs - #53949
Setting (font-lock-mode 0) in very large buffers will cause highlight-symbol-at-point to fail to highlight all matches

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

From: Dongli Si <kgdboc <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Setting (font-lock-mode 0) in very large buffers will cause
 highlight-symbol-at-point to fail to highlight all matches
Date: Sat, 12 Feb 2022 14:38:04 +0800

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

emacs version is 27.2 (Installed using dnf on fedora 35 system)

test file: https://github.com/torvalds/linux/blob/v5.16/kernel/events/core.c

Step1: emacs -Q kernel/events/core.c
Step2: eval "(font-lock-mode 0)"
Step3: eval "(highlight-regexp "static")"

The "static" keyword at the end of the file is not highlighted.

[Message part 2 (text/html, inline)]

Message #8 received at 53949 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Dongli Si <kgdboc <at> gmail.com>
Cc: 53949 <at> debbugs.gnu.org
Subject: Re: bug#53949: Setting (font-lock-mode 0) in very large buffers
 will cause highlight-symbol-at-point to fail to highlight all matches
Date: Sat, 12 Feb 2022 09:35:28 +0100

Dongli Si <kgdboc <at> gmail.com> writes:

> emacs version is 27.2 (Installed using dnf on fedora 35 system)
>
> test file: https://github.com/torvalds/linux/blob/v5.16/kernel/events/core.c

Better test URL:  https://raw.githubusercontent.com/torvalds/linux/v5.16/kernel/events/core.c

> Step1: emacs -Q kernel/events/core.c
> Step2: eval "(font-lock-mode 0)"
> Step3: eval "(highlight-regexp "static")"
>
> The "static" keyword at the end of the file is not highlighted.

I can reproduce this in Emacs 27.2, but not in Emacs 29, so I guess this
has been fixed now.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 53949 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Dongli Si <kgdboc <at> gmail.com>, 53949 <at> debbugs.gnu.org
Subject: Re: bug#53949: Setting (font-lock-mode 0) in very large buffers
 will cause highlight-symbol-at-point to fail to highlight all matches
Date: Sat, 12 Feb 2022 19:01:42 +0200

>> emacs version is 27.2 (Installed using dnf on fedora 35 system)
>>
>> test file: https://github.com/torvalds/linux/blob/v5.16/kernel/events/core.c
>
> Better test URL:  https://raw.githubusercontent.com/torvalds/linux/v5.16/kernel/events/core.c
>
>> Step1: emacs -Q kernel/events/core.c
>> Step2: eval "(font-lock-mode 0)"
>> Step3: eval "(highlight-regexp "static")"
>>
>> The "static" keyword at the end of the file is not highlighted.
>
> I can reproduce this in Emacs 27.2, but not in Emacs 29, so I guess this
> has been fixed now.

In Emacs 28 the default value of `hi-lock-highlight-range'
was increased from 200000 to 2000000.

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