Panel auto hide support for Wayland panels
Summary:
This change implements auto-hide support for Wayland panels. To properly
test the screenedgeshowtest is reworked to support both X11 and Wayland
windows.
Reviewers: KWin, Plasma on Wayland, bshah
Subscribers: plasma-devel, kwin
Tags: Plasma on Wayland, KWin
Differential Revision: https://phabricator.kde.org/D3080