Set Qt::KeypadModifier depending on current keysym
Summary:
The Qt::KeypadModifier should only accompany a keysym when this specific keysym
originates from the keypad not in general for every keysym while numlock is
engaged.
BUG: 400658
FIXED-IN: 5.18.0
Test Plan: Manually with the Thumbnail Grid task switcher and numlock enabled.
Reviewers: KWin, davidedmundson
Reviewed By: KWin, davidedmundson
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D26283