subMenu disappear flicker （version >= 4.1.2）

[cszo]

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

Reproduction link

https://codepen.io/cszo/pen/yLYEQxZ

Steps to reproduce

当我将菜单项悬停在一个菜单项 并快速切换悬停至同一级别的另一个菜单项时，上一个子菜单消失闪烁
when i hover the menu-item and quickly hover another menu-item at the same level, the previous subMenu disappear flicker

What is expected?

不闪烁 跟4.1.1及之前版本一样

What is actually happening?

当我将菜单项悬停在一个菜单项 并快速切换悬停至同一级别的另一个菜单项时，上一个子菜单消失闪烁
when i hover the menu-item and quickly hover another menu-item at the same level, the previous subMenu disappear flicker

Environment	Info
antd	4.1.2
React	16.13.1
System	macOS
Browser	chrome 81.0.4044.138（正式版本） （64 位）

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antd4.1.1正常：https://codepen.io/cszo/pen/ZEbjpaG
antd4.1.2异常：https://codepen.io/cszo/pen/yLYEQxZ

[shaodahong]

Resolved by #23664, Upgrade version >= 4.2.0

[cszo]

Resolved by #23664, Upgrade version >= 4.2.0

4.2.0依然有这个问题啊。。。当鼠标在menu-item上面上下快速移动 子菜单的渲染还会有重叠的感觉。。https://codepen.io/cszo/pen/xxwJXVp

[mjfwebb]

Probably could be improved by using z-index. I.e the submenu which is closing would have a lower index than the one which is opening.

[afc163]

Resolved by #23664, try 4.2.2