[bug report] Popover is applied in table. When: append to body = "false" and placement = "top", the positioning of top in some lines is invalid
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- Dominant language
- Vue
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Description
### Element UI version
2.15.6
### OS/Browsers version
w10 最新版谷歌浏览器
### Vue version
2.6.14
### Reproduction Link
https://elementui.github.io/issue-generator/#/zh-CN
### Steps to reproduce
自定义列的显示内容
121
123
且table也设置高度了
append-to-body="false"设置为false,是为了解决table表格,有很多列的时候,水平滚动的话,会造成popover不会跟着当前元素移动
### What is Expected?
placement="top" 设置为top,可以定位到元素的上方
### What is actually happening?
placement="top" 设置为top,部分行,无法定位到元素上方
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