Drawer 第二次打开时 maskStyle 样式被清除

[PanStar]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.6.2

Environment

Chrome 81.0.4044.92

Reproduction link

Steps to reproduce

https://codesandbox.io/s/antdv-drawer-maskstyle-mj2j2

第一次打开，样式正常
第二次打开，遮罩样式中的 left 和 width 被清除了

What is expected?

It's normal when depend by ant-design-vue@1.6.2

What is actually happening?

It is not work when depend by ant-design-vue@1.6.2.
But, it's normal in ant-design-vue@1.4.12.

[ununian]

我试了下是1.5出来的bug
应该是下面这个代码的问题

ant-design-vue/components/vc-drawer/src/Drawer.js

Lines 171 to 177 in 5108f67

	if (!open && this.getCurrentDrawerSome()) {
	document.body.style.overflowX = '';
	if (this.maskDom) {
	this.maskDom.style.left = '';
	this.maskDom.style.width = '';
	}
	}

我不是很清楚这段代码的作用
@tangjinzhou

[github-actions]

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