分页器每页显示数量功能，选中样式下拉关闭时显示错误！

[GlodenBoy]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.3.10

Environment

win10,chrome 72.0.3626.119 ,vue 2.x

What is expected?

官方示例也有这个问题。

如图显示：

当下拉框关闭时 选中的蓝色背景会自动跳转到第一项。

[sendya]

请使用 codesandbox 进行复现

[GlodenBoy]

请使用 codesandbox 进行复现

已补充，官方示例 其实就有这个问题。

[github-actions]

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