GNU bug report logs - #10903
24.0.93; redisplay glitch with before-string and display overlays

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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#10903: closed (24.0.93; redisplay glitch with before-string
 and display overlays)
Date: Wed, 29 Feb 2012 17:51:02 +0000

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Your message dated Wed, 29 Feb 2012 19:52:17 +0200
with message-id <83r4xdcysu.fsf <at> gnu.org>
and subject line Re: bug#10903: 24.0.93; redisplay glitch with before-string and display overlays
has caused the debbugs.gnu.org bug report #10903,
regarding 24.0.93; redisplay glitch with before-string and display overlays
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: Stephen Berman <stephen.berman <at> gmx.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.93; redisplay glitch with before-string and display overlays
Date: Mon, 27 Feb 2012 23:04:03 +0100

1. emacs -Q

2. Type `C-x b a RET' to get a fresh buffer in Fundamental mode, and  at
(point-min) type "012".

3. Type `M-<' so that the cursor is over (i.e. just before) `0'.

4. Type `M-: (overlay-put (make-overlay (point) (point)) 'before-string
"*")'.  Now you see this:

*012

5. Type `M-: (overlay-put (make-overlay (point) (1+ (point))) 'display
"")'.  Now you see this:

*12

6. Type `M-: (remove-overlays)' to restore "012".

7. Type SPC to advance the cursor and the start of "012" to column one.

8. Repeat step 4.  Now you see this:

 *012

9. Repeat step 5.  Now you see this:

 *112

According to my tests, this redisplay glitch happens when the overlays
begin anywhere other than (point-min).  It also only happens when the
before-string overlay is added prior to the display string overlay, and
only when the value of the display string is "".  I don't know when this
problem appeared, but it does not happen in Emacs 23.3.


In GNU Emacs 24.0.93.1 (i686-suse-linux-gnu, GTK+ Version 2.24.7)
 of 2012-02-26 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
Configured using:
 `configure '--without-toolkit-scroll-bars' 'CFLAGS=-g''

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: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 10903-done <at> debbugs.gnu.org
Subject: Re: bug#10903: 24.0.93;
	redisplay glitch with before-string and display overlays
Date: Wed, 29 Feb 2012 19:52:17 +0200

> From: Stephen Berman <stephen.berman <at> gmx.net>
> Cc: 10903 <at> debbugs.gnu.org
> Date: Tue, 28 Feb 2012 23:25:13 +0100
> 
> > Since Savannah is on the move, I cannot commit the fix, but perhaps
> > you could test it locally and see if there are any leftovers.  Here's
> > the patch:
> 
> I applied the patch and rebuilt, and the redisplay glitches I observed
> are gone; thanks very much for the quick fix!  I consider this bug
> resolved, but it should probably be closed after the fix is committed to
> the trunk.  Thanks again.

Thanks for testing.  I committed the fix (revision 107465 on the
trunk) and closed the bug.

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