Menu在超出页面长度时显示异常

[ydfzgyj]

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

Version

2.0.0-rc.2

Environment

vue 3.0.3
vite 1.0.0-rc.13

Reproduction link

https://2x.antdv.com/components/menu-cn/

Steps to reproduce

（偷了个懒，官方文档就能复现）
把页面宽度拉窄到出现 … 为止

What is expected?

维持上一个版本的展示

What is actually happening?

应该被收到 … 里的菜单仍然跟在 … 之后显示，且如果被收起的菜单里含有子菜单，鼠标放到 … 里的菜单上，外边未收起的也会同时显示子菜单

[github-actions]

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