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

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Package: emacs;

Reported by: Carsten Dominik <carsten.dominik <at> gmail.com>

Date: Sat, 21 Nov 2009 11:10:04 UTC

Severity: normal

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

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From: Carsten Dominik <carsten.dominik <at> gmail.com>
To: emacs-pretest-bug <at> gnu.org
Subject: bug#5000: 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

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>

Recent messages:
Auto-saving...
(New file)
OVERVIEW
Scanning for dabbrevs...100%
dabbrev-expand: No dynamic expansion for `add-tex' found
complete-tag: No tags table loaded; try M-x visit-tags-table
t
Mark set
complete-tag: No tags table loaded; try M-x visit-tags-table
Making completion list...

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Features:
(shadow emacsbug multi-isearch help-mode view etags dabbrev cal-china
lunar solar cal-dst cal-bahai cal-islam cal-hebrew holidays hol-loaddefs
diary-lib diary-loaddefs cal-iso org-indent vc-git flyspell ispell
org-wl org-vm org-rmail org-mhe org-mew org-mac-message org-irc
org-habit org-jsinfo org-infojs org-html org-exp org-exp-blocks
org-agenda org-info org-id org-gnus org-bibtex org-bbdb org-clock ido
jka-compr-ccrypt jka-compr muse-texinfo texnfo-upd texinfo muse-latex
muse-html muse-xml-common pcomplete cus-edit muse-publish muse-project
muse-protocols info muse-regexps muse muse-nested-tags muse-mode
remember org-remember org-datetree org byte-opt bytecomp byte-compile
advice help-fns advice-preload derived org-footnote org-src org-list
org-faces org-compat org-macs noutline outline cal-menu calendar
cal-loaddefs org-install paren iswitchb cus-start cus-load tex-site
bbdb-hooks bbdb-rmail rmailsum rmail bbdb-gnus gnus-art mm-uu mml2015
epg-config epg-package-info mm-view smime dig gnus-sum nnoo gnus-group
gnus-undo nnmail mail-source format-spec gnus-start gnus-spec gnus-int
gnus-range gnus-win bbdb-snarf mail-extr gnus gnus-ems bbdb-gui bbdb-com
bbdb message sendmail regexp-opt ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
time-date mm-util mail-prsvr gmm-utils wid-edit mailheader canlock sha1
hex-util hashcash mail-utils timezone magit diff-mode log-edit easymenu
easy-mmode ring pcvs-util add-log parse-time cl cl-19 tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd font-setting tool-bar dnd
fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer
select scroll-bar mldrag mouse jit-lock font-lock syntax facemenu
font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev loaddefs button minibuffer faces
cus-face text-properties overlay md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
font-render-setting x-toolkit x multi-tty emacs)
This bug report was last modified 15 years and 171 days ago.

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