关于select dropdownRender 点击拓展项时，select会失去光标，导致下拉列表自动收起

[peamed]

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

Version

1.4.2

Environment

window、Google-80.0.3987.132（正式版本） （64 位）、Vue-v1.4.2

Reproduction link

https://www.antdv.com/components/select-cn/

Steps to reproduce

按照提供的链接，即你们自己的文档例子中关于select dropdownRende

What is expected?

点击拓展项不会自动关闭

What is actually happening?

点击拓展项的输入框，可以保持不关闭状态

[tangjinzhou]

https://codesandbox.io/s/vue-antd-template-wmjlv

[github-actions]

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