Bug#698731: /usr/bin/gedit: long lines with large fonts make text disappear

[activityworkshop]

Package: gedit
Version: 2.30.4-1squeeze1
Severity: normal
File: /usr/bin/gedit

Set font size to very large (eg 40pt Monospace), and type characters (without spaces) until the window scrolls.
At some point (depending on the font size and perhaps the window size), the whole line just goes blank.
Backspacing makes the whole line appear again, typing again makes it all disappear.  Sometimes selecting the
blank text (either with the mouse or with the keyboard) makes individual characters reappear.

It doesn't just happen for Monospace, and not just for 40pt, but the number of characters at which it starts
happening does depend on the font size and font.  For example with 40pt Monospace I can type A-ZA-ZA-L (64 chars)
without problems, and the line vanishes on the third M.  With a smaller font I can type more characters.
Also happens on another squeeze installation.

-- Package-specific info:
Active plugins:
  - docinfo
  - modelines
  - filebrowser
  - spell
  - time

No plugin installed in $HOME.

Module versions:
  - glib                  2.24.2
  - gtk+                  
  - gtksourceview         
  - pygobject             
  - pygtk                 
  - pygtksourceview       2.10.1
  - enchant               
  - iso-codes             3.23

Python module versions:
  - python                2.6.6
  - pygtk                 2.17.0 (GTK+ 2.20.1)


-- System Information:
Debian Release: 6.0.6
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.38-1-686 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gedit depends on:
ii  gconf2             2.28.1-6              GNOME configuration database syste
ii  gedit-common       2.30.4-1squeeze1      official text editor of the GNOME 
ii  iso-codes          3.23-1                ISO language, territory, currency,
ii  libatk1.0-0        1.30.0-1              The ATK accessibility toolkit
ii  libc6              2.11.3-4              Embedded GNU C Library: Shared lib
ii  libcairo2          1.10.2-7~bpo60+1      The Cairo 2D vector graphics libra
ii  libenchant1c2a     1.6.0-1               a wrapper library for various spel
ii  libgconf2-4        2.28.1-6              GNOME configuration database syste
ii  libglib2.0-0       2.24.2-1              The GLib library of C routines
ii  libgtk2.0-0        2.20.1-2              The GTK+ graphical user interface 
ii  libgtksourceview2. 2.10.4-1              shared libraries for the GTK+ synt
ii  libice6            2:1.0.6-2             X11 Inter-Client Exchange library
ii  libpango1.0-0      1.28.3-1+squeeze2     Layout and rendering of internatio
ii  libpython2.6       2.6.6-8+b1            Shared Python runtime library (ver
ii  libsm6             2:1.1.1-1             X11 Session Management library
ii  libx11-6           2:1.3.3-4             X11 client-side library
ii  libxml2            2.7.8.dfsg-2+squeeze6 GNOME XML library
ii  python             2.6.6-3+squeeze7      interactive high-level object-orie
ii  python-gobject     2.21.4+is.2.21.3-1    Python bindings for the GObject li
ii  python-gtk2        2.17.0-4              Python bindings for the GTK+ widge
ii  python-gtksourcevi 2.10.1-1              Python bindings for the GtkSourceV
ii  python-support     1.0.10                automated rebuilding support for P

Versions of packages gedit recommends:
ii  python-gnome2                 2.28.1-1   Python bindings for the GNOME desk
ii  zenity                        2.30.0-1   Display graphical dialog boxes fro

gedit suggests no packages.

-- no debconf information