| value | 刚刚断开连接的 InputDevice。 |
定义委托，用于在 InputDevice 断开连接时注册事件。
通过此委托可接收设备断开连接事件，从而便于在设备列表发生更改时了解这一情况。
**注意**：对于传入设备而言，InputDevice.IsValid 将为 false，唯一可用的设备数据将为 InputDevice.name、InputDevice.role 及与其他 InputDevice 对象的比较。
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