wlr_seat_client destroyed when all seat resources are
So it's not possible for a client to create a wl_seat, then create a wl_pointer, and immediately destroy the wl_seat (because it'll wl_resource_destroy the wl_pointer too).
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So it's not possible for a client to create a wl_seat, then create a wl_pointer, and immediately destroy the wl_seat (because it'll wl_resource_destroy the wl_pointer too).