Fix lock screen focus
Summary:
When the screen is locked, the focus always remains on the main screen. This patch fixes the problem: now the focus is on the screen where the cursor is located.
BUG: 395639
FIXED-IN: 5.16.0
Reviewers: davidedmundson
Reviewed By: davidedmundson
Subscribers: ngraham, graesslin, abetts, davidedmundson, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D17706