>From address@hidden Fri Apr 15 23:22:23 2016
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Subject: [PATCH] Temporarily bind `TeX-insert-macro-default-style' to
 'show-optional-args'
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Date: Fri, 15 Apr 2016 23:22:23 +0900
From: Ikumi Keita <address@hidden>
To: dummy

* latex.el (LaTeX-item-argument): Temporarily bind
`TeX-insert-macro-default-style' to 'show-optional-args'.
This is necessary in description environment if the user customize the
option to `mandatory-args-only'.

diff --git a/latex.el b/latex.el
--- a/latex.el
+++ b/latex.el
@@ -1259,7 +1259,8 @@
 
 (defun LaTeX-item-argument ()
   "Insert a new item with an optional argument."
-  (let ((TeX-arg-item-label-p t))
+  (let ((TeX-arg-item-label-p t)
+	(TeX-insert-macro-default-style 'show-optional-args))
     (TeX-insert-macro "item")))
 
 (defun LaTeX-item-bib ()