bug#23181: 25.1.50; rmail renders text left to right when it shouldn't

[Alfred M. Szmidt]

When I get a message that is detected as written in Arabic, it renders
left to right.  But any messages subsequent I read -- even if pure
7-bit ASCII, will continue to render left to right.  E.g (note the
screwed up punctuation):

                              X-Spam-Status: No, score=-0.2 required=5.0 
tests=BAYES_50,RP_MATCHES_RCVD
                                                                       
autolearn=disabled version=3.3.2
                                                                       <From: 
Werner Koch <wk@gnupg.org
                                                         To: 
gnupg-announce@gnupg.org, info-gnu@gnu.org
                                                                         
Subject: GnuPG 2.0.29 released
                                                                            
Organisation: g10 Code GmbH
                                                                
Mail-Followup-To: gnupg-users@gnupg.org
                                                                  Date: Thu, 31 
Mar 2016 13:12:40 +0200
                         "==Content-Type: multipart/mixed; 
boundary="===============8795560078139731226


                                                                              
[1:multipart/signed Hide]


                                                                                
  [1/1:text/plain Hide]

                                                                                
                 !Hello

                                  We are pleased to announce the availability 
of a new stable GnuPG-2.0
                                  release: Version 2.0.30.  This is a 
maintenance release which fixes a
                                                                                
        .couple of bugs

                                 The GNU Privacy Guard (GnuPG) is a complete 
and free implementation of
                                   .the OpenPGP standard as defined by RFC-4880 
and better known as PGP



In GNU Emacs 25.1.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.8)
 of 2016-03-02 built on berylium
Repository revision: 7d69780681bd68a052a3b2ee814675b78d4a5063
Windowing system distributor 'The X.Org Foundation', version 11.0.11801000
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: C
  locale-coding-system: nil

Major mode: RMAIL

Minor modes in effect:
  shell-dirtrack-mode: t
  rcirc-track-minor-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Showing message 3748...done
Showing message 3749...done
Showing message 3750...done
Showing message 3751...done
Showing message 4344...done
Showing message 4474...done
Mark set [2 times]
Saved text until "tps://www.gnu.org/help/evaluation.html.
"
Making completion list...

Load-path shadows:
~/loaddefs hides /home/ams/emacs/lisp/loaddefs

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hashtable-print-readable backquote dbusbind inotify dynamic-setting
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Memory information:
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