DropDown will be out of shape when it close to the edge of the viewport

[iyikin]

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

Version

3.1.0-rc.2

Environment

win10/chrome 92.0.4515.131/vue 3.2.20

Reproduction link

Steps to reproduce

hover it

What is expected?

the menu will be open normally

What is actually happening?

the menu was out of shape

it's normal in 3.0.0-beta.13

[github-actions]

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