GNU bug report logs - #12364
24.2.50; wrong overhang display for gstring compositions

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#12364: closed (24.2.50; wrong overhang display for gstring
 compositions)
Date: Tue, 11 Sep 2012 04:02:02 +0000

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Your message dated Tue, 11 Sep 2012 13:01:10 +0900
with message-id <wly5khrywp.wl%mituharu <at> math.s.chiba-u.ac.jp>
and subject line Re: bug#12364: 24.2.50; wrong overhang display for gstring compositions
has caused the debbugs.gnu.org bug report #12364,
regarding 24.2.50; wrong overhang display for gstring compositions
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: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; wrong overhang display for gstring compositions
Date: Thu, 06 Sep 2012 11:37:26 +0900

Steps to Reproduce:

1. $ emacs -Q &
2. evaluate (set-fontset-font t 'arabic (font-spec :family "arial" :size 30))
3. C-u C-\ arabic RET
4. u S u
   At this moment, the two grapheme clusters look connected.
5. C-b C-p
   Now the two grapheme clusters look unconnected.

See also the "u-S-u" example in the first screenshot in
http://lists.gnu.org/archive/html/bug-gnu-emacs/2012-09/msg00178.html .

I think at least the two occurrences of the following line in xdisp.c
are wrong.

      int first = (s->first_glyph - glyphs) + (s->cmp ? 1 : s->nchars);

The value of s->cmp seems to be NULL for the "gstring" cases.

					YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

In GNU Emacs 24.2.50.1 (x86_64-apple-darwin12.1.0, X toolkit, Xaw3d scroll bars)
 of 2012-09-06 on YAMAMOTO-no-iMac.local
Bzr revision: 109895 yamaoka <at> jpl.org-20120905224543-v2x5qiqin2b83lnv
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
Configured using:
 `configure '--enable-checking' '--with-jpeg=no' '--with-gif=no'
 '--with-tiff=no' 'CFLAGS=-g3''

Important settings:
  value of $LANG: ja_JP.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-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

[Message part 3 (message/rfc822, inline)]

From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: 12364-done <at> debbugs.gnu.org
Subject: Re: bug#12364: 24.2.50;
	wrong overhang display for gstring compositions
Date: Tue, 11 Sep 2012 13:01:10 +0900

>>>>> On Fri, 07 Sep 2012 17:47:23 +0900, YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp> said:

> I tried making a fix.  The change for xterm.c is so the box cursor can
> invert the left overhang of the succeeding glyph.

I've just installed the patch.

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

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