bug#69493: 30.0.50; Preferable choice of coding system on Japanese

[Kazuhiro Ito]

When I call (set-language-environment "Japanese"), below code in
lisp/language/japan-util.el is called.

(defun setup-japanese-environment-internal ()
  (prefer-coding-system (if (memq system-type '(windows-nt ms-dos cygwin))
                            'japanese-shift-jis
                          'utf-8))
  (use-cjk-char-width-table 'ja_JP))

1. japanese-shift-jis is not proper coding system on Cygwin.
2. We have japanese-cp932, more appropriate coding system for DOS/Windows.

PLease see below patch.

diff --git a/lisp/language/japan-util.el b/lisp/language/japan-util.el
index 93e8ab24971..f3ec44bf75d 100644
--- a/lisp/language/japan-util.el
+++ b/lisp/language/japan-util.el
@@ -29,8 +29,8 @@
 
 ;;;###autoload
 (defun setup-japanese-environment-internal ()
-  (prefer-coding-system (if (memq system-type '(windows-nt ms-dos cygwin))
-                           'japanese-shift-jis
+  (prefer-coding-system (if (memq system-type '(windows-nt ms-dos))
+                           'japanese-cp932
                          'utf-8))
   (use-cjk-char-width-table 'ja_JP))



-- 
Kazuhiro Ito