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bug#5000: marked as done (23.1.50; empty string not allowed as line-pref


From: Emacs bug Tracking System
Subject: bug#5000: marked as done (23.1.50; empty string not allowed as line-prefix)
Date: Sat, 05 Dec 2009 22:55:04 +0000

Your message dated Sat, 05 Dec 2009 17:49:39 -0500
with message-id <address@hidden>
and subject line Re: 23.1.50; empty string not allowed as line-prefix
has caused the Emacs bug report #5000,
regarding 23.1.50; empty string not allowed as line-prefix
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact address@hidden
immediately.)


-- 
5000: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=5000
Emacs Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: 23.1.50; empty string not allowed as line-prefix Date: Sat, 21 Nov 2009 12:01:02 +0100

It seems that an empty string as a line prefix makes the redisplay
engine choke.

Test case:

- open a new buffer in fundamental mode, no auto-fill-mode
- insert a long line that will be wrapped for display into two or more
  lines.
- insert the following form into the buffer, after the long line

   (add-text-properties (point-min) (point) '(line-prefix ""))

- evaluate this form

Expected result:  No change in display
Actual result:  The formerly wrapped line is no longer wrapped but
displayed as if truncate-lines had been set (it is not set)

I suspect that the empty string causes the problem.  A nil line-prefix
property, or a non-empty string both work fine.

It is possible (likely?) that the same error also occurs with
wrap-prefix, but I have not tested this.



If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/Users/dominik/lib/git/emacs-new/etc/DEBUG.


In GNU Emacs 23.1.50.2 (i386-apple-darwin9.8.0, X toolkit, Xaw3d scroll bars)
 of 2009-11-20 on carsten-dominiks-macbook-pro.local
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
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: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  show-paren-mode: t
  iswitchb-mode: t
  diff-auto-refine-mode: t
  tooltip-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

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? ? ? <tab> <down> <tab> <tab> <down> <tab> <tab> <tab>
C-x C-f $ o r g e l / t t t <backspace> <backspace>
e <tab> t t t . o r g <return> <return> <return> <return>
M-x f u n d a m <tab> <return> SPC <backspace> k j
f SPC a l k f j SPC l a k j f SPC a l k j f SPC a l
k j f SPC a l k j f h SPC a l k f j SPC a l k j f h
SPC a l k j f SPC a l k f j h SPC a l k f j h SPC a
l k j f h SPC a l k j f h SPC l a k j f SPC l a k j
f h SPC l a k j s f h SPC l a k j s f h SPC l k a j
s h f SPC l k j SPC <up> <up> <up> C-d C-d C-d <down>
<down> <return> ( a d d - t e x M-/ <escape> <tab>
t - p r o p e r t i e s SPC ( p o i n t - m i n ) SPC
( p o i n t ) SPC ' ( l i n e - p r e f i x SPC " "
) ) C-x C-e <up> <up> <down> <down> <up> <left> <down>
C-a C-SPC C-e <escape> w M-x s u b m i t - b u <tab>
<backspace> <tab> <backspace> <tab> <tab> <escape>
<tab> C-a C-k <tab> C-x o C-x o C-s - b u g C-s C-s
C-s C-s C-s C-s C-s C-s C-s C-s <help-echo> <down-mouse-1>
<mouse-2>

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font-render-setting x-toolkit x multi-tty emacs)






--- End Message ---
--- Begin Message --- Subject: Re: 23.1.50; empty string not allowed as line-prefix Date: Sat, 05 Dec 2009 17:49:39 -0500
> - open a new buffer in fundamental mode, no auto-fill-mode
> - insert a long line that will be wrapped for display into two or more
>   lines.
> - insert the following form into the buffer, after the long line
>
>    (add-text-properties (point-min) (point) '(line-prefix ""))
>
> - evaluate this form
>
> Expected result:  No change in display
> Actual result:  The formerly wrapped line is no longer wrapped but
> displayed as if truncate-lines had been set (it is not set)

I've checked in a fix.  Thanks.

--- End Message ---

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