KWin: tooltips
Summary:
BUG: 383040
KDecoration part of the patch:
https://phabricator.kde.org/D7246
Reviewers: graesslin
Reviewed By: graesslin
Subscribers: cfeck, graesslin, luebking, broulik, kwin, KWin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D9294