当表格在Tabs组件内部高度不够时筛选下拉框的按钮会被挡住

[belongwqz]

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

Version

1.3.16

Environment

firefox69,win7

Reproduction link

Steps to reproduce

见重现链接代码，点击“筛选”会弹出下拉菜单，上下均被挡住无法操作。

What is expected?

筛选下拉框不被挡住

What is actually happening?

筛选下拉框被挡住，看不到最下面的按钮

[sendya]

https://codesandbox.io/s/vue-antd-template-qfndz

我怀疑你的 Vue 入口，没地方挂载，原本会寻找 #app 这个 dom，但是找不到。
antd 的各类弹层会挂在 body 下根层，而你提供的 demo 直接挂在的 table 下，所以怀疑找不到根节点。
在看了入口文件，发现没用 #app 这个 dom，加上之后就没问题了

[belongwqz]

@sendya
把你的app.vue和main.js内容完全拷贝到我的demo里执行问题依旧

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