[Bug Report] I can't drag an element in el-drawer out the drawer to another div （el-drawer 内的元素无法拖拽到外部区域 ，外部区域无法响应其drop事件）
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- Dominant language
- Vue
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Description
### Element UI version
2.15.6
### OS/Browsers version
Chrome 95
### Vue version
2.6.11
### Reproduction Link
https://github.com/ElemeFE/element
### Steps to reproduce
1. el-drawer has an DOMelement
2. drag the DOMelement out the el-drawer to another div
3. the div can't trigger drop event
el-drawer 内的元素无法拖拽到外部区域 ，外部区域无法响应其drop事件
### What is Expected?
the div can trigger drop event 。 el-drawer 内的元素无法拖拽到外部区域 ，外部区域可以响应其drop事件
### What is actually happening?
the div can‘t trigger drop event 。el-drawer 内的元素拖拽到外部区域 ，外部区域没响应其drop事件
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