Summary:
The "Force" part in WindowForceBackgroundContrastRole and WindowForceBlurRole
is confusing. If WindowForceBlurRole is set on a window, background
behind it won't be blurred.
By setting WindowForceBlurRole we tell the Blur effect "that's fine to
do your business behind transformed windows."
The Slide effect only translates windows, it doesn't distort them, etc.
So, we can set WindowForceBackgroundContrastRole and WindowForceBlurRole
for all windows.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D15707
6cac594acb