bug#2571: 23.0.91; Crashes on zooming pdf document

[pent <pent@aparamon.msk.ru>]

To reproduce:

0) emacs -Q

1) Open a pdf document, for example this one:

   http://www.adobe.com/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf

2) Hit S-`+' several times. Emacs crashes once the width of the
   document page becomes wider than the window.

I'm ready to provide any additional info,
Andrey Paramonov

In GNU Emacs 23.0.91.1 (i486-pc-linux-gnu, GTK+ Version 2.12.12)
 of 2009-02-28 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20090228-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
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-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.91/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.91/site-lisp:/usr/share/emacs/site-lisp' '--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' 'CPPFLAGS=''

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: ru_RU.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  delete-selection-mode: t
  show-paren-mode: t
  pc-selection-mode: t
  pretty-control-l-mode: t
  shell-dirtrack-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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Loading /etc/emacs/site-start.d/50w3m-el.el (source)...done
Loading /etc/emacs/site-start.d/50w3m-el-snapshot.el (source)...done
Loading /etc/emacs/site-start.d/51debian-el.el (source)...done
Loading /etc/emacs/site-start.d/99pp-c-l.el (source)...done
Loading gnus...done
Loading pc-select...done
Loading paren...done
Starting Emacs daemon.
When done with this frame, type C-x 5 0
Making completion list... [2 times]