GNU bug report logs - #43373
28.0.50; Regression: Unrecognized style region in mhtml-mode

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

From: Simen Heggestøyl <simenheg <at> runbox.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Regression: Unrecognized style region in mhtml-mode
Date: Sun, 13 Sep 2020 13:32:12 +0200

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

The following bug is a regression since 27.1 introduced on master by
commit eae028b9e2c23f84dbd130d49da65f9db1db932f (found by bisection).

To reproduce, open the attached file 'mhtml-test.html' from
'emacs -Q'. The region from position 516 to 558 (approximately the
"button {cursor: pointer; }" part) is not recognized as being part of
the style block, and doesn't receive the correct mode (HTML+CSS).

[mhtml-test.html (text/html, inline)]

[Message part 3 (text/plain, inline)]

-- Simen

Message #10 received at 43373 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Simen Heggestøyl <simenheg <at> runbox.com>
Cc: 43373 <at> debbugs.gnu.org
Subject: Re: bug#43373: 28.0.50; Regression: Unrecognized style region in
 mhtml-mode
Date: Wed, 27 Jan 2021 07:09:03 +0100

Simen Heggestøyl <simenheg <at> runbox.com> writes:

> The following bug is a regression since 27.1 introduced on master by
> commit eae028b9e2c23f84dbd130d49da65f9db1db932f (found by bisection).
>
> To reproduce, open the attached file 'mhtml-test.html' from
> 'emacs -Q'. The region from position 516 to 558 (approximately the
> "button {cursor: pointer; }" part) is not recognized as being part of
> the style block, and doesn't receive the correct mode (HTML+CSS).

I was able to reproduce this in September, but I'm no longer able to (in
Emacs 28), so perhaps it has been fixed in the meantime?  Do you still
see this problem?

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

Message #15 received at 43373 <at> debbugs.gnu.org (full text, mbox):

From: Simen Heggestøyl <simenheg <at> runbox.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 43373 <at> debbugs.gnu.org
Subject: Re: bug#43373: 28.0.50; Regression: Unrecognized style region in
 mhtml-mode
Date: Wed, 27 Jan 2021 09:24:30 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> I was able to reproduce this in September, but I'm no longer able to (in
> Emacs 28), so perhaps it has been fixed in the meantime?  Do you still
> see this problem?

Hi Lars.

Just checked this from master at 9d50d7a0c6, still seeing the same error
as before.

-- Simen

Message #20 received at 43373 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Simen Heggestøyl <simenheg <at> runbox.com>
Cc: 43373 <at> debbugs.gnu.org
Subject: Re: bug#43373: 28.0.50; Regression: Unrecognized style region in
 mhtml-mode
Date: Thu, 28 Jan 2021 03:58:27 +0100

Simen Heggestøyl <simenheg <at> runbox.com> writes:

> Just checked this from master at 9d50d7a0c6, still seeing the same error
> as before.

Sorry; I should have checked with emacs -Q -- with that I can indeed
reproduce the bug, so I started bisecting my .emacs to see why I
couldn't in my normal Emacs.

And it is, bizarrely enough, this:

./src/emacs --eval '(global-so-long-mode 1)' /tmp/mhtml-test.html 

With global-so-long-mode switched on, mhtml-mode correctly switches to
"HTML+CSS" as soon as I move point into "button" part of the CSS
section!

Which is just bizarre, because that shouldn't be triggering at all in
this file (and isn't, as far as I can tell).

Before I start trying to find out what's going on here, because this is
just all to odd -- are you seeing the same?

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

Message #23 received at 43373 <at> debbugs.gnu.org (full text, mbox):

From: Simen Heggestøyl <simenheg <at> runbox.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 43373 <at> debbugs.gnu.org
Subject: Re: bug#43373: 28.0.50; Regression: Unrecognized style region in
 mhtml-mode
Date: Thu, 28 Jan 2021 08:25:56 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Before I start trying to find out what's going on here, because this is
> just all to odd -- are you seeing the same?

Yup.

Message #26 received at 43373 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Simen Heggestøyl <simenheg <at> runbox.com>
Cc: 43373 <at> debbugs.gnu.org
Subject: Re: bug#43373: 28.0.50; Regression: Unrecognized style region in
 mhtml-mode
Date: Fri, 29 Jan 2021 06:28:11 +0100

Simen Heggestøyl <simenheg <at> runbox.com> writes:

>> Before I start trying to find out what's going on here, because this is
>> just all to odd -- are you seeing the same?
>
> Yup.

It appears that if I say

(defun so-long-detected-long-line-p () nil)

then the problem can be reproduced, but something in that function is
doing something to the buffer which makes font locking happen
correctly...  I think it's probably the narrow-to-region things that
makes Emacs re-fontify the buffer at opportune moments, which somehow
makes the multi-mode thing trigger from a better context...  or
something...

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

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