for some reason KSMShutdownFeedback::stop() was not doing anything when the
KWin effect was taking care of the logout effect but KWin also does not
apply the effect to windows other than the one created by ksmserver
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
unless compositor is not active it is not even used (KWin has logout
effect for that) and there is a curtain effect as fallback
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>