Auto complete dropdown flickers upon render

[szgupta]

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

Version

1.4.2

Environment

vue-version>=2.6.6, browser-version=chrome@77.0.3865.120

Reproduction link

https://vue.ant.design/components/auto-complete/

Steps to reproduce

Type very quickly into the auto-complete components on Ant Design Vue

What is expected?

The dropdown should not flicker. The desired behaviour is implemented by Ant Design React

What is actually happening?

The dropdown flickers

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