Consider the following file:
% -*- coding: utf-8; mode: latex; -*-
% $
\def\foo_with_underscore{}
%
%
\def\foo_bar_foo_bar{}
% $
%
The presence of the $ sign in comments trigger math mode highlighting in
between, as demonstrated in the attached screenshot
This happens in 13.0.11 (installed via Elpa) but did not happen at 12.2.0 and
in fact I sticked with 12.2.0 for a long period because I had it still by
accident on another computer where I had started lots of tex coding using very
often $ in comments for some special reasons (it had another catcode) and when
on my laptop which was with auctex from git I realized I could not work at all
anymore because of this highlighting problem I simply rsync'ed from my other
computer to my laptop as I had no time to devote to this issue. I thought
perhaps the problem was with doctex-mode but today I see I can trigger it in
latex-mode.
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.
Possibly relevant to this in my config are (but I did not try to change them)
'(font-latex-fontify-script (quote multi-level))
'(texmathp-search-n-paragraphs 0)
For the latter I dimly recall it was an old issue I had in doctex with
highlighting too but I don't recall the details and it might be something else
whatsoever. (I think last week I did try removing this to see if it affected
the present issue but it did not).
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