Duplicate children head when grouping table head

[fajrizulfikar]

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

Version

1.7.3

Environment

Vue version: 2.5.17

Reproduction link

https://du33k.csb.app/

Steps to reproduce

1. Import and call a-table in the view with the following spec: scroll.x =1500, scroll.y= 300
2. Define the columns like in the codesandbox

What is expected?

Children head not duplicated

What is actually happening?

Children head duplicated

[tangjinzhou]

https://codesandbox.io/s/vue-antd-template-forked-xkhfu
留一列不设置宽度

[github-actions]

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