Subject: 24.3.92; Incorrectly isolated ع in علی

From: penthief <[email-masked]>
Date: Sun, 29 Jun 2014 13:30:36 +0100

The following should display differently, as in 24.3.1.
A.  ع ل ی - these are the "isolated" types.
B.  علی  - this is a final, medial and initial type.
C.  عل ی‎ - the isolated ی should be joined when the space is removed. 
This is the bug demonstrated.

0. Start emacs: $ emacs -Q
1. Output علی with a bold face in the appropriate font:
(progn
   (setq buffer-face-mode-face '(:family  "DejaVu Sans Mono" 
:alternate-families  "Monaco" :height 100))
   (buffer-face-mode)
   (buffer-face-set 'bold)
   (newline)
   (insert " علی"))

  علی

2. Change to a regular face:
(buffer-face-set 'default)
  علی

What happens is ی (ARABIC LETTER FARSI YEH) switches from the final to 
the isolated type.
This is incorrect since there should be no difference in the 
representation when eval-ing the following:

(buffer-face-toggle 'bold)

The output of describe-char on the emboldened and regular differs on the 
following:

Regular (incorrect):

Composed using this font:
   
xft:-unknown-KacstDecorative-normal-normal-normal-*-11-*-*-*-*-0-iso10646-1
by these glyphs:
   [0 0 0 107 5 0 6 5 2 nil]

Bold (correct):

Composed using this font:
   xft:-unknown-KacstOne-bold-normal-normal-*-11-*-*-*-*-0-iso10646-1
by these glyphs:
   [2 2 0 200 7 0 8 2 4 nil]

Please note that this bug does not exist on 24.3.1, and I apologise if 
it is a problem with my compilation settings.

Regards,
Matt

In GNU Emacs 24.3.92.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
  of 2014-06-28 on zz
Repository revision: 117323 
[email-masked]
Windowing system distributor `The X.Org Foundation', version 
11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
  `configure --with-dbus --with-libotf --with-m17n-flt'

Important settings:
   value of $LC_CTYPE: en_US.UTF-8
   value of $LANG: en_US.UTF-8
   value of $XMODIFIERS: @im=ibus
   locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
   tooltip-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
   line-number-mode: t
   transient-mark-mode: t

Recent input:
M-x r e p o <tab> - e - b <tab> <return>

Recent messages:
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None found.

Features:
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help-fns mail-prsvr mail-utils help-mode easymenu time-date tooltip
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
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Memory information:
((conses 16 72971 7323)
  (symbols 48 17511 0)
  (miscs 40 61 164)
  (strings 32 9378 3890)
  (string-bytes 1 256561)
  (vectors 16 9668)
  (vector-slots 8 389112 14907)
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  (intervals 56 182 0)
  (buffers 960 12)
  (heap 1024 46452 877))