also don't count unmapped surfaces for exclusive zone
and exclusive_focus is now of type void *
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exclusive_focus = layersurface->layer_surface->surface;
client_notify_enter(exclusive_focus, wlr_seat_get_keyboard(seat));
exclusive_focus = layersurface;
client_notify_enter(layersurface->layer_surface->surface, wlr_seat_get_keyboard(seat));