Summary:
The highlight windows effect tried to trigger repaints with the shadow
included by having an hardcoded pixel offset. This of course breaks if
the shadow is larger than the hardcoded value.
The reason presented on why it was done like that is no longer true and
in the effects the actual visible area including decorations and shadows
is available through the expandedGeometry.
BUG: 368495
Reviewers: #kwin, #plasma
Subscribers: plasma-devel, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D2748
d910217bb9