ElemeFE / ElemeFE/element

[Bug Report] firefox 浏览器中 el-table-column 开启 show-overflow-tooltip,若 slot 为 flex 布局会触发不了 tooltip 显示

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Dominant language
Vue
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Description

### Element UI version
2.15.12

### OS/Browsers version
windows 10, firefox 107.0.1

### Vue version
2.7.14

### Reproduction Link
https://codepen.io/foreverZ133/pen/MWXZbdm?editors=1010

### Steps to reproduce
* firefox 浏览器中 el-table-column 开启 show-overflow-tooltip
* 增加 slot,内容超长,且有一层 flex 布局包裹
* 渲染成功后,在此 cell 上触发 hover(若无反应则重现成功)

也可直接看 demo 实现:https://codepen.io/foreverZ133/pen/MWXZbdm?editors=1010

### What is Expected?
兼容 firefox 浏览器,表现为 el-table-column 开启 show-overflow-tooltip 后触发 hover 会显示 tooltip。

### What is actually happening?
firefox 浏览器中 el-table-column 开启 show-overflow-tooltip,触发 hover 后 tooltip 未显示

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