Bug#550877: systemsettings: Changing "Default Window Manager" restarts X unexpectedly (under LTSP)

[David Steiner <doodydexter@yahoo.com>]

Package: systemsettings
Version: 4:4.3.2-1
Severity: critical
Justification: causes serious data loss

In systemsettings -> Default Applications -> Window Manager; i selected "use a different window manager", namely: Openbox. Before it was at "use the default KDE window manager (KWin)". Then a window came up, notifying me, that the new window manager will be started, so I clicked ok. It's funny that I was already in OpenBox, and so I thought nothing would happen. However after clicking ok, the X11 Session closed, and I was greeted with the LDM Login manager (used in LTSP), while potentially loosing all unsaved documents..  

I don't use KDE4, but I installed kdebase-workspace, so that Kded wouldn't spam my terminal window full of messages. I have Xorg running on a thin client via the standard Linux Terminal Server Project, and it has it's own login manager (LDM). systemsettings needs to:
- recognize that KDE isn't the window manager in use (why was it selected the first time i launched systemsettings?)
- a clearer warning should be issued to the user, that he should save his documents before X11 restarts

Another potential issue is that when I select "use the default KDE window manager (KWin)", the same thing happens as (hopefully well) described above. Yet, OpenBox starts, since LDM is the login manager and not KDM. 


-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.30-2-686 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages systemsettings depends on:
ii  kdebase-runtime               4:4.3.2-1  runtime components from the offici
ii  kdelibs5                      4:4.3.2-2  core libraries for all KDE 4 appli
ii  libc6                         2.9-27     GNU C Library: Shared libraries
ii  libfontconfig1                2.6.0-4    generic font configuration library
ii  libqt4-dbus                   4:4.5.3-3  Qt 4 D-Bus module
ii  libqt4-xml                    4:4.5.3-3  Qt 4 XML module
ii  libqtcore4                    4:4.5.3-3  Qt 4 core module
ii  libqtgui4                     4:4.5.3-3  Qt 4 GUI module
ii  libstdc++6                    4.4.1-6    The GNU Standard C++ Library v3
ii  libx11-6                      2:1.2.2-1  X11 client-side library

systemsettings recommends no packages.

systemsettings suggests no packages.

-- no debconf information