shutdown-dialog is opened even if it shouldn't

[hakaishi]

When executing "gnome-session-quit --force --no-prompt --power-off" a dialog shows up, even though it shouldn't.
I tested "dbus-send --session --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.RequestShutdown" too and the result is the same (also only with .Shutdown).
I've looked further into this and found out that RequestShutdown should not call a dialog. You can see this in the description of org.gnome.SessionManager.xml in lines 319-325.

Just to mention another problem coming with this: When setting (lets say with the dconf-editor) at org->gnome->gnome-session (also org.gnome.SessionManager) logout-prompt to false, no dialogs are shown at all (with either Method) and clicking on Shutdown in the indicator menu also just shuts down instead of showing the option(s) to reboot etc. which is really undesired.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-session-bin 3.2.1-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94-0ubuntu1
Architecture: amd64
Date: Tue Mar 6 14:17:33 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120305)
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.