data-device: send the selection to all the wl_data_device resources of a client

As we do for the input interfaces such as wl_pointer, we must send the
selection event to all the wl_data_device resources the client created for
a specified seat.

Reviewed-by: Daniel Stone <daniels@collabora.com>

src/data-device.c

@@ -743,16 +743,19 @@ weston_seat_send_selection(struct weston_seat *seat, struct wl_client *client)
 {
 	struct wl_resource *data_device, *offer;
 
-	data_device = wl_resource_find_for_client(&seat->drag_resource_list,
-						  client);
-	if (data_device && seat->selection_data_source) {
+	wl_resource_for_each(data_device, &seat->drag_resource_list) {
+		if (wl_resource_get_client(data_device) != client)
+		    continue;
+
+		if (seat->selection_data_source) {
 			offer = weston_data_source_send_offer(seat->selection_data_source,
 								data_device);
 			wl_data_device_send_selection(data_device, offer);
-	} else if (data_device) {
+		} else {
 			wl_data_device_send_selection(data_device, NULL);
 		}
 	}
+}
 
 WL_EXPORT void
 weston_seat_set_selection(struct weston_seat *seat,