Summary:
There is no concept of managed windows in Wayland, so every time we call
managed() on a Wayland client, it will return false.
This change addresses that problem by invoking managed() only for X11 clients.
CCBUG: 398100
Test Plan:
* Open KCM of the Translucency effect and decrease opacity of inactive windows;
* Open Dolphin;
* Click on desktop.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D16319
8063740efb