ElemeFE / ElemeFE/element

[Bug Report] 在keep-alive缓存的页面切换时,el-dialog的遮罩会出现问题

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Description

### Element UI version
2.15.7

### OS/Browsers version
macOS10.15.7/firfox96.0.2

### Vue version
2.6.14

### Reproduction Link

### Steps to reproduce
我们的是一个后台管理系统,常规的左右菜单加内容的布局方式。
由于需要将el-dialog弹窗控制在内容区域,而不是全页面覆盖弹出。有次引发出来的问题就是,当el-dialog在弹出状态的时候,我就可以点击菜单切换到其它页面,再点击显示一个el-dailog出来。这时候如果再次切回之前的页面,发现el-dialog弹窗还在,背景遮罩消失了

### What is Expected?
期待两个缓存页面切换的时候,页面内部的el-dialog和遮罩一并缓存

### What is actually happening?
实际遮罩会出现异常消失

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