Summary:
Effects::checkInputWindowEvent(QWheelEvent *e) existed but it was not
hooked up to anything and would never be called.
This patch adds the relevant handling in the wayland filter, X filter so
the existing method gets called.
EffectQuickView is updated to handle wheel events.
Test Plan:
Used a ListView via an EffectQuickView in an effect.
I can now scroll with the mouse.
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: zzag, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D25292