new logout effect
Summary:
new logout effect: it's just a slow fade in of the logout
greeter (window is usable immediately tough
Test Plan: logout greeter now fades in without setting the window opacity manually
Reviewers: graesslin, Plasma
Reviewed By: graesslin, Plasma
Subscribers: broulik, plasma-devel, kwin, KWin
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D5045