[Bug Report] horizental scrollbar appears in table component when table size changes

[hchaojie]

Element UI version

2.0.0-alpha.3

OS/Browsers version

windows10 / chrome 61, edge 40

Vue version

2.5.2

Reproduction Link

https://jsfiddle.net/tk76u3um/

Steps to reproduce

1. open https://jsfiddle.net/tk76u3um/
2. drag the editor splitter left and right to resize the result window, see how the inner table component changes
   if you drag the splitter right, the horizental scrollbar will apear. it's ugly and annoying.
   this issue is very common and can be easily reproduced for an admin-template site, see this related issue:
   浏览器或者页面的宽度发生变化时, element表格会出现滚动条 PanJiaChen/vue-element-admin#247 (comment)

What is Expected?

no scrollbar blinking during drag

What is actually happening?

scrollbar appears during drag

[dimitrisnl]

Have this problem as well. Would like an workaround!

[PanJiaChen]

I think it caused by the code of

.el-table__body-wrapper {
    overflow: auto;
}

but you can't simply remove it, In some cases it is necessary, i think solved by the official is the best. And l find ant has hacked it.