菜单收缩时子菜单滚动条不能操作

[jingping-ye]

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

What problem does this feature solve?

菜单收缩时，如果悬浮子菜单过多，那么菜单会将页面的高撑破。我写了一行代码实现了将子菜单的高限制在当前屏幕的高之内,如下。看起来很可行，但是实际操作的时候，会发现鼠标不能去操作滚动条，但是使用鼠标滚轮可以。

<style lang="scss">
.ant-menu-dark,
.ant-menu-dark .ant-menu-sub {
  max-height: 100vh;
  overflow: auto;
}
</style>

What does the proposed API look like?

滚动条可以操作

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