Cascader showsearch property breaks hover interactivity in displayRender.

[KrFeher]

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

Reproduction link

Steps to reproduce

1. Check if hover works (it won't)
2. Now comment out ShowSearch property
3. Try hover again (it works)

What is expected?

For displayRender interactivity to continue working

What is actually happening?

It doesn't work.

Environment	Info
antd	3.19.1
React	16.9.0
System	Windows 10
Browser	Chrome Version 72.0.3626.121

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This line is causing it to override "position: static" from ant-cascader-input class with relative.

ant-design/components/cascader/style/index.less

Line 20 in abb8692

&-picker-show-search &-input.@{ant-prefix}-input {

Removing this however stops the Showsearch to work.

[KrFeher]

Hi, is this going to be picked up / fixed ?

[KrFeher]

Hello?

[afc163]

It is a thorny problem.

[afc163]

It is fixed in 5.x now: https://stackblitz.com/edit/react-tugdgz?file=demo.tsx