backend/wayland: manage cursor for current pointer

backend/wayland/output.c

@@ -419,8 +419,9 @@ static void output_destroy(struct wlr_output *wlr_output) {
 }
 
 void update_wl_output_cursor(struct wlr_wl_output *output) {
-	if (output->backend->pointer && output->enter_serial) {
+	struct wlr_wl_pointer *pointer = output->backend->current_pointer;
-		wl_pointer_set_cursor(output->backend->pointer, output->enter_serial,
+	if (pointer && pointer->output == output && output->enter_serial) {
+		wl_pointer_set_cursor(pointer->wl_pointer, output->enter_serial,
 			output->cursor.surface, output->cursor.hotspot_x,
 			output->cursor.hotspot_y);
 	}

backend/wayland/seat.c

@@ -48,6 +48,7 @@ static void pointer_handle_enter(void *data, struct wl_pointer *wl_pointer,
 	struct wlr_wl_output *output = wl_surface_get_user_data(surface);
 	assert(output);
 	struct wlr_wl_pointer *pointer = output_get_pointer(output);
+	assert(!backend->current_pointer || backend->current_pointer == pointer);
 
 	output->enter_serial = serial;
 	backend->current_pointer = pointer;