[effects/slidingpopups] Use override keyword
Test Plan: Compiles.
Reviewers: KWin, davidedmundson
Reviewed By: KWin, davidedmundson
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D14801
zzag | Aug 14 2018, 8:55 AM |