Modal 对话框：打开弹窗时，页面仍然可以滚动

[yanyalin]

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

Version

4.0.0-rc.5

Environment

官方网站，生产环境

Reproduction link

https://next.antdv.com/components/modal-cn

Steps to reproduce

Modal 对话框：随便打开一个就行

What is expected?

期望和ant-design-vue3.X一样，打开弹窗时，页面无法滚动

What is actually happening?

Modal 对话框：打开弹窗，页面可以滚动

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我看了下，ant-design-vue，1.X、2.X、3.X都没有这个现象，ant-design react版本也没有这个现象

[CCherry07]

ok,我来看看

[github-actions]

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