[Bug Report] Drawer当鼠标点击该区域并拖动到遮罩层时，Drawer不应该关闭
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- Dominant language
- Vue
- Stars
- 54k
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Description
### Element UI version
2.15.9
### OS/Browsers version
windows chrome
### Vue version
2.7.0-beta.8
### Reproduction Link
https://elementui.github.io/issue-generator/#/zh-CN
### Steps to reproduce
Drawer当鼠标点击该区域并拖动到遮罩层时松开，Drawer不应该关闭
### What is Expected?
Drawer当鼠标点击该区域并拖动到遮罩层时松开，Drawer不应该关闭
### What is actually happening?
Drawer当鼠标点击该区域并拖动到遮罩层时松开，Drawer关闭了
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