Dropdown 弹窗位置异常！！！！！

[yvywang]

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

Version

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Environment

http://gzdxda.vicp.io:9912/，任何一个环境都可以复现，账号：15813374073 密码：123456

Reproduction link

http://gzdxda.vicp.io:9912/

Steps to reproduce

下拉菜单平分父级元素的宽度自适应，当宽度从小变大后再变小，弹窗的宽度显示异常

What is expected?

下拉菜单弹窗的宽度能与菜单宽度一致

What is actually happening?

下拉菜单弹窗的宽度只能变大，不能缩小

[github-actions]

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