[server] Send keyboard leave when client destroys the focused surface
Summary:
This is a change inspired by https://bugreports.qt.io/browse/QTBUG-61930.
When Qt closes a window due to a key press event it starts to repeat the
event as KWayland does not send a keyboard leave event. Weston on the
other hand does send out the keyboard leave. In my opinion it doesn't
make much sense to send out the keyboard leave in this situation and in
my opinion that is a client bug, but if it makes clients happy we can
send them the keyboard leave. Similar this should be done for pointer,
touch, etc.
BUG: 382280
Test Plan: Run the example added to the Qt bug and it worked fine
Reviewers: Frameworks, Plasma
Subscribers: plasma-devel
Tags: Plasma on Wayland, Frameworks
Differential Revision: https://phabricator.kde.org/D6683