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bug#48365: 13.0.11; Dollars in distinct comments trigger math mode highl

From: JF
Subject: bug#48365: 13.0.11; Dollars in distinct comments trigger math mode highlighting in text in-between
Date: Tue, 11 May 2021 22:21:25 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:78.0) Gecko/20100101 Thunderbird/78.10.1

Le 11/05/2021 à 22:06, jfbu a écrit :

Hi Tassilo,

Le 11/05/2021 à 21:26, Tassilo Horn a écrit :
Hi Jean-Francois,

git bisect indicates first bad commit is

commit 6654955216a42936b87f76dc346aad829b1d52fb
Date:   Wed Jun 3 01:44:32 2020 +0900

     Use search-based fontification for $...$ (bug#33139)

Reading the commit message, I see there was extensive discussion and
the change seems to have been discussed in depth and well-motivated. I
wonder if you can confirm that you see the same at your locale as me.

Yes, I see the problem.  I've pushed a fix which ignores $ in comments
just as it already ignored $ in verbatim contexts.

Could you please test and report back?

Yes, it works also in original context, not only in the short test file.
I realize now that after all I did work for a while with this problem
and I see one file where I have lots of extra $'s added in comments
to create pairs of $'s and avoid the propagation, I removed them
and no ill effect arose, the math highlighting was not applied.

But... wait...

Sadly, I now have another problem. Consider this:

\def\XINT:NE:f:noeval:from:braced:u:p #1#2%

There is $ in there, and it triggers math mode highlighting which is a priori 
I can live with that *if I can constrain it to not extend beyond that line*

In the past I would control it this way:

\def\XINT:NE:f:noeval:from:braced:u:p #1#2%

(observe the added $ at end of second line after the % comment character)

With your patch the %$ does not stop the math highlighting !

This is very problematic to me because that problem can't be solved (as I
could solve earlier one, especially now that I understand better what causes it,
via locating extra $'s inside comments)
by adding a commented out $.

It basically means I have not way to stop the highlighting from propagating...

not true. I could use another character than % and assign it catcode comment and
use it at end of line

but not that if I am "aguerri" enough for such manoeuvers this might not
be the case of all auctex users and they might do something like
\newcommand\foo{$} and then perhaps they have the same problem as me ?

% -*- coding: utf-8; mode: latex; -*-
\newcommand\foo{$}% $ does not help here
\def\foo_with_underscore{$}% <-- but math highlight will stop here



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