If the launched client decides to pass it's token along as an activation
request, allow that. This will make the behavior match tokens provided by
an external launcher client.
Check if the app that requested a token has provided a valid input
serial and a focused surface. Downgrade activation request to urgency
otherwise.
This is mostly in line with what other Wayland compositors decided to
do, and offers a better security than the original logic.
xdg-activation is now too strict in only allowing tokens with a seat to
activate a surface. Clients may rely on this behavior for urgency hints.
The seat argument is still useful in case the client does provide a seat
so we can activate it on the desired seat.
Fixes: 842609da64 (view: make request_activate take a seat, 2022-11-30)
