wayland backend: emit signal for input/output removal

backend/wayland/output.c

@@ -46,6 +46,7 @@ static void wlr_wl_output_transform(struct wlr_output_state *output,
 }
 
 static void wlr_wl_output_destroy(struct wlr_output_state *output) {
+	wl_signal_emit(&output->backend->backend->events.output_remove, output->wlr_output);
 	if(output->frame_callback) wl_callback_destroy(output->frame_callback);
 	eglDestroySurface(output->backend->egl.display, output->surface);
 	wl_egl_window_destroy(output->egl_window);

backend/wayland/wl_seat.c

@@ -169,6 +169,7 @@ static struct wl_keyboard_listener keyboard_listener = {
 };
 
 static void input_device_destroy(struct wlr_input_device_state *state) {
+	wl_signal_emit(&state->backend->backend->events.input_remove, state->wlr_device);
 	if (state->resource)
 		wl_proxy_destroy(state->resource);
 	free(state);
@@ -206,7 +207,7 @@ static struct wlr_input_device *allocate_device(struct wlr_backend_state *state,
 		free(devstate);
 		return NULL;
 	}
-
+	devstate->wlr_device = wlr_device;
 	list_add(state->devices, wlr_device);
 	return wlr_device;
 }

include/backend/wayland.h

@@ -40,6 +40,7 @@ struct wlr_output_state {
 
 struct wlr_input_device_state {
 	struct wlr_backend_state *backend;
+	struct wlr_input_device *wlr_device;
 	void *resource;
 };