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bug#5019: 23.1.50; Emacs crashes with line-prefix text properties and ou


From: Carsten Dominik
Subject: bug#5019: 23.1.50; Emacs crashes with line-prefix text properties and outline
Date: Mon, 23 Nov 2009 10:47:34 -0000

Emacs can be repeatedly crashed by using a combination of `outline-mode'
and line-prefix text properties.  The crash happens when a call to
`(hide-sublevels 1)' makes anything currently visible in an Emacs window
invisible, while the text in the window has line-prefix text properties.

Here is a way to reproduce this bug:

Put the following text into a file and open the file in Emacs:


   -*- mode: outline -*-


----------------------8x------------8x----------------8x----------------8x
* my test 
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(add-text-properties (point-min) (point-max) '(line-prefix "  "))
(hide-sublevels 1)
----------------------8x------------8x----------------8x----------------8x


The number of lines must be large enough so that scrolling to the end of
the buffer will move the outline headline "my test" out of view.

To reproduce the crash, visit the test file with Emacs, make sure that
it is in outline-mode.  Then scroll down and evaluate the
add-text-properties form.  Then move one line down and evaluate the
hide-sublevel form.

- Carsten Dominik


In GNU Emacs 23.1.50.1 (i386-apple-darwin9.7.0, X toolkit, Xaw3d scroll bars)
 of 2009-08-04 on carsten-dominiks-macbook-pro.local
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--with-x11''

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: Outline

Minor modes in effect:
  show-paren-mode: t
  iswitchb-mode: t
  yas/minor-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:
M-x r e p <tab> <backspace> <backspace> e p o r t - 
e m a <tab> <return>

Recent messages:
Loading /Users/dominik/.custom.el (source)...
Loading iswitchb...done
Loading paren...done
Loading /Users/dominik/.custom.el (source)...done
Ido mode enabled
Loading /Users/dominik/lib/emacs/lisp/db-colors.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
crash has auto save data; consider M-x recover-this-file
Loading vc-git...done
Making completion list...

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