scene: send surface enter/leave events
Builds on top of https://github.com/swaywm/wlroots/pull/3117 to automatically send surface enter/leave events.
Depends on: https://github.com/swaywm/wlroots/pull/3117
Builds on top of https://github.com/swaywm/wlroots/pull/3117 to automatically send surface enter/leave events.
Depends on: https://github.com/swaywm/wlroots/pull/3117