GNU bug report logs - #20173
24.4; Rendering misallocates combining marks on ligatures

Previous Next

Package: emacs;

Reported by: Richard Wordingham <richard.wordingham <at> ntlworld.com>

Date: Mon, 23 Mar 2015 01:07:02 UTC

Severity: normal

Found in version 24.4

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

Full log

View this message in rfc822 format

From: Richard Wordingham <richard.wordingham <at> ntlworld.com>
To: 20173 <at> debbugs.gnu.org
Subject: bug#20173: 24.4; Rendering misallocates combining marks on ligatures
Date: Mon, 23 Mar 2015 01:06:26 +0000

When a ligature of two base characters has two combining marks on the
first component but none on the second, the second combining mark is
rendered as though it applied to the second component. A good example
is the Arabic sequence لَّا (lam, shadda, fatha, alef - <U+0644, U+0651,
U+064E, U+0627), where the shadda is rendered on the lam part of
lam-alif ligature and the fatha on the alif part.  This problem is not
restricted to right-to-left scripts; I encountered the problem when
debugging left-to-right rendering.  Lam-alif is one of the most
reliably generated ligatures bearing marks on different components.
This bug report was last modified 4 years and 282 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.