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bug#4016: 23.1.50; docview: scrolling up breaks after setting a slice

From: Paer Kurlberg
Subject: bug#4016: 23.1.50; docview: scrolling up breaks after setting a slice
Date: Sun, 02 Aug 2009 16:07:35 +0200

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden
mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

View a dvi file (or pdf file for that matter) with DocView.

Set a slice by typing "ss" (invoking doc-view-set-slice) with x and y
coordinates zero, and maximum width and height, as suggested by the
prompt.  (In fact, any slice settings seems to trigger the phenomena.)

When hitting space (invoking doc-view-scroll-up-or-next-page), the
document is not scrolled up, and the following error message appears:

image-next-line: Invalid image specification

Note: By hitting "sr" (removing the slice) it is again possible to use
space to scroll up.

Remark: On a laptop with a small screen it would be very useful to set
slices to get rid of the large margins, and yet being able to scroll
through the document (even with a slice set, I cannot see the whole
page at once.)

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'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1.50/etc/DEBUG for instructions.

In GNU Emacs (i486-pc-linux-gnu, GTK+ Version 2.16.1)
 of 2009-07-31 on lansones, modified by Debian
 (emacs-snapshot package, version 1:20090730-1~jaunty1)
Windowing system distributor `The X.Org Foundation', version
configured using `configure  '--build' 'i486-linux-gnu' '--host'
 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
 '--libexecdir=/usr/lib' '--localstatedir=/var'
 '--infodir=/usr/share/info' '--mandir=/usr/share/man'
 '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu'
 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN
 -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed'

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: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: DocView

Minor modes in effect:
  tooltip-mode: t
  tool-bar-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:
C-x C-f a r n o l d . d v i <return> <return> s s 0 
<return> 0 <return> 9 2 6 <return> 1 3 1 0 <return> 
SPC <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar> 
<help-menu> <send-emacs-bug-report>

Recent messages:
Loading /etc/emacs/site-start.d/51planner-el.el (source)...done
Loading /etc/emacs/site-start.d/52remember-el.el (source)...
Loading /usr/share/emacs/site-lisp/remember-el/remember-autoloads.el
Loading /etc/emacs/site-start.d/52remember-el.el (source)...done
Loading /etc/emacs/site-start.d/60hyperspec.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
DocView: using cached files!
Type C-c C-c to toggle between editing or viewing the document.
No key given.  Assumed normal.
image-next-line: Invalid image specification

Load-path shadows:

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