GNU bug report logs - #28277
tex-mode font-lock of \it escapes math mode

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: richard.banach <at> manchester.ac.uk (Richard Banach)
Cc: 28277 <at> debbugs.gnu.org
Subject: bug#28277: emacs -nw bug?
Date: Wed, 30 Oct 2019 17:43:33 +0100

richard.banach <at> manchester.ac.uk (Richard Banach) writes:

> I use   emacs -nw  and see what looks like a bug
>
> * in tex mode, if I type   $\it identifiername$   it doesn't recognise
> the second $ as closing the scope of \it ... and wants to underline
> everything that follows ... i haven't found how to turn this off

The following patch fixes the problem -- but I'm not sure whether it
could cause any regressions.

Is

\it foobar $math-stuff$

or something like it possible?  It's been a while since I wrote any TeX.


diff --git a/lisp/textmodes/tex-mode.el b/lisp/textmodes/tex-mode.el
index f277defecf..9d9490602a 100644
--- a/lisp/textmodes/tex-mode.el
+++ b/lisp/textmodes/tex-mode.el
@@ -593,7 +593,7 @@ tex-font-lock-keywords-2
 	    ;; Miscellany.
 	    (slash "\\\\")
 	    (opt " *\\(\\[[^]]*\\] *\\)*")
-	    (args "\\(\\(?:[^{}&\\]+\\|\\\\.\\|{[^}]*}\\)+\\)")
+	    (args "\\(\\(?:[^${}&\\]+\\|\\\\.\\|{[^}]*}\\)+\\)")
 	    (arg "{\\(\\(?:[^{}\\]+\\|\\\\.\\|{[^}]*}\\)+\\)"))
        (list
 	;;


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

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