Summary:
The appearing of the logout screen is animated by both the Fade effect
and the Logout effect. The former should not animate the logout screen
because that's the job of the latter.
Test Plan:
Clicked the shut down button, the log out screen smoothly faded in.
Clicked the cancel button, the log out screen instantaneously disappeared.
Reviewers: #kwin, #plasma, davidedmundson
Reviewed By: #kwin, #plasma, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D14582
d61f3ec2d5