bug#22786: 25.1.50; eww arabic rendering

[Mohamed Hibti <mohamed.hibti@gmail.com>]

Hi all,

There is a problem with the arabic composition (the letters are not
displayed isolated and not assembled in a word). 

Mohamed

In GNU Emacs 25.1.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.23)
 of 2016-01-24 built on cassiopee
Repository revision: 6d25cbeaaf93615b8d7f26024ba014104eb5d4f2
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04.4 LTS

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND GSETTINGS NOTIFY LIBXML2 FREETYPE
M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11

Important settings:
  value of $LC_MONETARY: fr_FR.UTF-8
  value of $LC_NUMERIC: fr_FR.UTF-8
  value of $LC_TIME: fr_FR.UTF-8
  value of $LANG: fr_FR.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: eww

Minor modes in effect:
  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
  blink-cursor-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:
For information about GNU Emacs and the GNU system, type C-h C-a.
Contacting host: aljazeera.net:80
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Making completion list... [2 times]

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired dired-loaddefs rfc822 mml
mml-sec epg epg-config mm-decode mm-bodies mm-encode mailabbrev
gmm-utils mailheader sendmail network-stream nsm starttls url-http tls
gnutls mail-parse rfc2231 rfc2047 rfc2045 ietf-drums url-gw url-cache
url-auth eww puny seq mm-url gnus gnus-ems nnheader mail-utils wid-edit
url-queue url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse auth-source cl-seq eieio
byte-opt bytecomp byte-compile cl-extra cconv eieio-core cl-macs gv
eieio-loaddefs gnus-util mm-util help-fns help-mode easymenu mail-prsvr
password-cache url-vars mailcap shr dom cl-loaddefs cl-lib subr-x pcase
browse-url format-spec time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 8 196542 8585)
 (symbols 24 23712 0)
 (miscs 20 112 246)
 (strings 16 38292 8076)
 (string-bytes 1 1653802)
 (vectors 8 28616)
 (vector-slots 4 630813 16490)
 (floats 8 243 196)
 (intervals 28 7599 122)
 (buffers 520 16)
 (heap 1024 25127 830))