Adding a signal to ksmserver, that notifies DBus when KDE is about to logout.
This can be useful for some applications, in that case for PowerDevil, as related to bug #183273.

PowerDevil should be notified when a logout operation is in progress, so that it won't trigger a suspension while the pc is actually shutting down. This behavior is (was) really annoying.

I'm CC-ing the list since I don't know who the maintainer of ksm is, and also, should I backport this?

Obviously, a commit in PowerDevil for taking advantage of this is coming very soon