GNU bug report logs - #4426
23.0.91; posn-at-point returns an incorrect value

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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#4426: closed (23.0.91; posn-at-point returns an incorrect value)
Date: Sat, 08 Oct 2011 11:02:02 +0000

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Your message dated Sat, 08 Oct 2011 13:01:06 +0200
with message-id <83zkhbeoi5.fsf <at> gnu.org>
and subject line Re: bug#4426: [PATCH] posn-at-point returns an incorrect value
has caused the debbugs.gnu.org bug report #4426,
regarding 23.0.91; posn-at-point returns an incorrect value
to be marked as done.

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


-- 
4426: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4426
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Contact help-debbugs <at> gnu.org with problems

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From: IRIE Shinsuke <irieshinsuke <at> yahoo.co.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.0.91; posn-at-point returns an incorrect value
Date: Mon, 14 Sep 2009 18:18:47 +0900

I was going to acquire the width and height of a character the cursor
is over, by using the following code:

  (posn-object-width-height (posn-at-point))

However, I found that this code gives back a wrong result when a
header line is displayed such as tabbar-mode. This code returns the
size of another character, which is in the position different from the
exact one in the number of objects included in the header line.
For example, when the cursor is in the top left corner of the window,
the size of the object in the left end of the header line is obtained.

Steps to reproduce:

  1. Turn on tabbar-mode.

  2. Evaluate the following expressions in *scratch*:

       (defun char-w-h ()
         (message "%s" (posn-object-width-height (posn-at-point))))
       (add-hook 'post-command-hook 'char-w-h)

  3. Move a cursor from place to place in the window.


In GNU Emacs 23.0.91.1 (i486-pc-linux-gnu, GTK+ Version 2.16.0)
 of 2009-04-05 on palmer, modified by Debian
 (emacs-snapshot package, version 1:20090320-1ubuntu1)
Windowing system distributor `The X.Org Foundation', version 11.0.10600000
configured using `configure  '--build' 'i486-linux-gnu' '--host'
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.91/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.91/site-lisp:/usr/share/emacs/site-lisp'
'--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu'
'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN
-DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed'
'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ja_JP.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tabbar-mwheel-mode: t
  tabbar-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
u i r e SPC ' t C-p C-p C-p C-p C-p C-p C-p C-n C-n
C-n C-n C-n C-f C-f C-f C-f C-f C-f C-f C-f C-b C-b
C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-n
C-n C-e a b b a r ) C-j ( t a b b a r - m o d e ) C-j
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-n C-p C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f
C-f C-f C-f C-f C-f C-n C-p C-p C-b C-b C-b C-b C-b
C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b
C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b
C-b C-b C-b C-b C-b C-b C-b C-b C-b C-b C-n C-n C-n
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-n C-n
C-n C-p C-p C-p C-p C-p C-n C-n C-b C-p C-p C-n C-a
C-f C-f C-f C-f C-f C-f C-p C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-a C-a C-f C-f C-f
C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-f C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n ( r e m o v
e - h o o k SPC ' p o s t - c o m m a n d - h o o k
SPC ' c h a r - w - h ) C-j M-x r e p o r t - e m a
<tab> RET

Recent messages:
(7 . 14) [3 times]
(0 . 14)
(7 . 14)
(0 . 14)
(7 . 14)
(0 . 14)
(7 . 14)
(0 . 14)
(7 . 14) [3 times]
(0 . 14) [41 times]

-- 
IRIE Shinsuke, Ph.D.
irieshinsuke <at> yahoo.co.jp

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

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 4426-done <at> debbugs.gnu.org, irieshinsuke <at> yahoo.co.jp
Subject: Re: bug#4426: [PATCH] posn-at-point returns an incorrect value
Date: Sat, 08 Oct 2011 13:01:06 +0200

> From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
> Date: Sun, 18 Sep 2011 10:21:43 +0200
> Cc: 4426 <at> debbugs.gnu.org
> 
> As far as I can tell, this patch hasn't been applied yet.  I'm not
> familiar enough with this code to say whether this looks correct or
> not.  Could someone take a look?

I took a look.  The problem indeed was still there.  I installed a fix
(slightly different from what the OP suggested).

Thanks.

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