After the [feature request] cascade selector initializes the binding of a value ['headquarters'], click to open the drop-down box, and how to expand the next level of the value of the binding at the same time? (or how to trigger an event of a mouse hover option in the source code?)
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Description
### Existing Component
Yes
### Component Name
el-cascader 级联选择器
### Description
重现地址：https://codepen.io/nachen/pen/MWaqVYv
需求描述：
如在线代码示例，整个级联选择器一级节点就一个值（真实项目里比如一级节点就是当前用户的公司），所以自然初始化时就默认绑定了这个节点，那么，当我手动打开级联选择器的时候，就应该去自动加载我所绑定的这个值的下一页数据（如果有children）。而不是像现在这样鼠标还得先划到’总公司‘，再展开下级页面
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