GNU bug report logs - #44521
27.1; ivy.el breaks harfbuzz Arabic shaping

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#44521: closed (27.1; ivy.el breaks harfbuzz Arabic shaping)
Date: Tue, 10 Nov 2020 15:55:02 +0000

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Your message dated Tue, 10 Nov 2020 17:54:52 +0200
with message-id <83a6vp2omr.fsf <at> gnu.org>
and subject line Re: bug#44521: 27.1; ivy.el breaks harfbuzz Arabic shaping
has caused the debbugs.gnu.org bug report #44521,
regarding 27.1; ivy.el breaks harfbuzz Arabic shaping
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Thamer Mahmoud <thamer.mahmoud <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; ivy.el breaks harfbuzz Arabic shaping
Date: Sun, 08 Nov 2020 19:15:37 +0300

When using ivy.el, some Arabic letters become disconnected. This bug
doesn't affect Emacs 26.3 or any build "--without-harfbuzz".

1. Eval:

(progn
  (load-library "~/.emacs.d/elpa/ivy-0.13.0/ivy-overlay.el")
  (load-library "~/.emacs.d/elpa/ivy-0.13.0/colir.el")
  (load-library "~/.emacs.d/elpa/ivy-0.13.0/ivy.el")
  (ivy-mode t)
  (run-with-timer .5 nil 'set-input-method "arabic")
  (run-with-timer .5 nil 'insert "السلام عليكم")
  (execute-extended-command nil))

2. While still in the minibuffer, type any Arabic letter. Note the
   AIN(ع) in "عليكم" changes shape from initial to final.

This bug breaks shaping in most buffers, especially after using
swiper.el (ivy-based isearch).


libharfbuzz0b 2.6.7-1 from debian testing
In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
 of 2020-11-08, modified by Debian built on x86-ubc-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

-- 
Best,
Thamer

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Thamer Mahmoud <thamer.mahmoud <at> gmail.com>
Cc: 44521-done <at> debbugs.gnu.org
Subject: Re: bug#44521: 27.1; ivy.el breaks harfbuzz Arabic shaping
Date: Tue, 10 Nov 2020 17:54:52 +0200

> From: Thamer Mahmoud <thamer.mahmoud <at> gmail.com>
> Cc: 44521 <at> debbugs.gnu.org
> Date: Tue, 10 Nov 2020 12:19:12 +0300
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Actually, it turned out that the reason is very clear, thanks for the
> > recipe which made it so easy.  So I've now fixed this on the emacs-27
> > branch for the upcoming Emacs 27.2.
> 
> Confirmed fixed on 27.1.50.

Thanks, closing.

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