backend-headless: add a seat and some devices
Clients like gtk depend on the wayland server providing a wl_seat. This adds one and also some dummy devices while at it.
This makes it possible to run the gtk test suite with the headless backend.
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Clients like gtk depend on the wayland server providing a wl_seat. This adds one and also some dummy devices while at it.
This makes it possible to run the gtk test suite with the headless backend.