[Bug Report]Select组件或DatePicker组件 和Dropdown组件同时存在时，Dropdown组件下拉内容无法鼠标拖动滚动条，会直接触发clickouside

[yaomingdan]

Environment

win10/Chrome/vue2.6

Reproduction link

https://run.iviewui.com/z72Kgfu4

Steps to reproduce

Select组件或DatePicker组件 和Dropdown组件同时存在时，Dropdown组件下拉内容无法鼠标拖动滚动条，会直接触发clickouside
EN：When a Select component or a DatePicker component and a Dropdown component exist at the same time, the Dropdown component drop-down content cannot drag the scroll bar with the mouse, which triggers clickouside directly.

What is expected?

Select组件或DatePicker组件 和Dropdown组件同时存在时，Dropdown组件下拉内容可以通过鼠标下拉拖动滚动条
EN:When a Select component or a DatePicker component coexists with a Dropdown component, Dropdown component drop-down content can be dragged and scrolled through the mouse.

What is actually happening?

Select组件或DatePicker组件 和Dropdown组件同时存在时，Dropdown组件下拉内容无法鼠标拖动滚动条，会直接触发clickouside
EN:When a Select component or a DatePicker component and a Dropdown component exist at the same time, the Dropdown component drop-down content cannot drag the scroll bar with the mouse, which triggers clickouside directly.

[yaomingdan]

感觉这个clickouside directive，很多下拉组件会互相影响，包括cascader也是无法点击下级字段，单独用都正常

[wandway]

在Modal弹出时Select的option列表超出Modal区域也会显示不出来。

[yaomingdan]

4.0.1版本应该还是没有解决组件间互相影响的问题，当全局capture设置为false的时候，Select组件和Dropdown组件同时存在，该bug依旧会发生 @icarusion

[icarusion]

昨天 iview-run 没更新，现在已经到 4.0.1 了，你再刷新看看

[yaomingdan]

嗯，这种情况是可行的，但是在capture全局设置为false或者其他组件设置capture 为false的情况下，该问题依旧存在，具体我修改了一下代码，你看看 https://run.iviewui.com/nqJxMQmI @icarusion