Initialise XdgOutput properties on creation
Summary:
initWaylandOutput can be called before or after all properites are set.
If it's called after, we need to still have xdgOuput set correctly.
Test Plan:
Simplified Aleix's patch that avoids a no-op setScale call
Now it works.
Reviewers: KWin, apol
Reviewed By: apol
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D20800