From dcce2b57bb91d490787dffd437b61196f1029b41 Mon Sep 17 00:00:00 2001
From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Mon, 10 Aug 2020 16:26:34 +0200
Subject: [PATCH] Fix fontification of outdated TeX form

* lisp/textmodes/tex-mode.el (tex-font-lock-keywords-2): End the
expression before the terminating $ in constructions like $\it
identifiername$
(bug#28277). This avoids italicising the final $ character.

This fixes the final $ of the final test case here:

$foo$
\textit{foo}
{\it foo}
$\mathit{identifiername}$
$\textit{identifiername}$
${\it identifiername}$
$\it identifiername$
---
 lisp/textmodes/tex-mode.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/textmodes/tex-mode.el b/lisp/textmodes/tex-mode.el
index e3d5759579a..a905d148009 100644
--- a/lisp/textmodes/tex-mode.el
+++ b/lisp/textmodes/tex-mode.el
@@ -593,7 +593,7 @@ An alternative value is \" . \", if you use a font with a narrow period."
 	    ;; Miscellany.
 	    (slash "\\\\")
 	    (opt " *\\(\\[[^]]*\\] *\\)*")
-	    (args "\\(\\(?:[^{}&\\]+\\|\\\\.\\|{[^}]*}\\)+\\)")
+	    (args "\\(\\(?:[^${}&\\]+\\|\\\\.\\|{[^}]*}\\)+\\)")
 	    (arg "{\\(\\(?:[^{}\\]+\\|\\\\.\\|{[^}]*}\\)+\\)"))
        (list
 	;;
-- 
2.39.5