Broken submenu hover animation in vertical mode

[eugene-rn]

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

Version

3.11.2

Environment

MacOS 10.14.1, Chrome 70

Reproduction link

Steps to reproduce

You just need to hover on the links with sub links.

What is expected?

Animated showing of submenu

What is actually happening?

Submenu shown without any transitions

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It's happen when I doesn't pass mode="vertical" to Menu component. Vertical mode set by default, but there is no animation on hover in this case

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IssueHunt Summary

ztplz has been rewarded.

Backers (Total: $20.00)

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Submitted pull Requests

• #13602 Set menu mode to vertical by default

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[ztplz]

Oops! default is missing here. https://github.com/ant-design/ant-design/blob/master/components/menu/index.tsx#L226
But I don't think set mode by default is a best choice. It may be better to set it as a required
property for users to choose mode by themselves. What is your opinion?

[eugene-rn]

I think it will be right solution

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