GNU bug report logs - #5000
23.1.50; empty string not allowed as line-prefix

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Carsten Dominik <carsten.dominik <at> gmail.com>
To: emacs-pretest-bug <at> gnu.org
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.



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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:
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  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
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  auto-encryption-mode: t
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Recent input:
? ? ? <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)

Message #10 received at 5000 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Carsten Dominik <carsten.dominik <at> gmail.com>
Cc: 5000 <at> debbugs.gnu.org
Subject: Re: bug#5000: 23.1.50; empty string not allowed as line-prefix
Date: Sun, 22 Nov 2009 22:49:23 -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)

Isn't this the feature you were asking for?  ;-)


        Stefan


PS: You've won a special prize for submitting bug number 5000.

Message #15 received at 5000 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Carsten Dominik <carsten.dominik <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 5000 <at> debbugs.gnu.org
Subject: Re: bug#5000: 23.1.50; empty string not allowed as line-prefix
Date: Mon, 23 Nov 2009 06:13:24 +0100

On Nov 23, 2009, at 4:49 AM, Stefan Monnier wrote:

>> - 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)
>
> Isn't this the feature you were asking for?  ;-)
>
>
>        Stefan
>
>
> PS: You've won a special prize for submitting bug number 5000.

Hi Stefan,

yes, this is my requested feature all right.  Works butifully!  Except  
with
an empty string.

So, what is my prize? :-)

- Carsten

Message #20 received at 5000-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Carsten Dominik <carsten.dominik <at> gmail.com>
Cc: 5000-done <at> debbugs.gnu.org
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.

Message #21 received at 5000-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Carsten Dominik <carsten.dominik <at> gmail.com>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 5000-done <at> debbugs.gnu.org
Subject: Re: 23.1.50; empty string not allowed as line-prefix
Date: Sat, 5 Dec 2009 23:58:57 +0100

On Dec 5, 2009, at 11:49 PM, Chong Yidong wrote:

>> - 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.

You guys are the best, thanks.

- Carsten

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