[Bug Report] Tooltip in table cause body jitter

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#19,116 opened on Apr 4, 2020 1 comment 0 reactions 0 assignees View on GitHub

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Description

### Element UI version
2.13.0

### OS/Browsers version
Win

### Vue version
3.0.0-alpha.11

### Reproduction Link
https://jsfiddle.net/qii404/u4dk37zv/2/

### Steps to reproduce
table中某个列设置了 show-overflow-tooltip，从下向上滑动时，会导致body竖直方向进度条改变，导致 **body抖动**

目前只能通过给body增加样式 `overflow: hidden`临时解决

![reproduce](https://user-images.githubusercontent.com/5136418/78417108-6bc1f500-7661-11ea-8cfe-4aa270407a7d.gif)

### What is Expected?
目前tooltip是在body中的，但逻辑应该是table中的tooltip不应该影响body滚动条

### What is actually happening?
会导致body抖动

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