chenhaodong / mew-iview

Add new props 'childrenKey' to Tree component

 采用inject方法，修正问题：当FormItem组件在slot里时，无法正确获取form组件

fix #3195

采用 findComponentUpward 替代 this.$parent.$parent.$parent 获取 Dropdown 父节点组件

fix select dropdown position

Fix a confliction in Input component

Fixed issue #2931

Fix clearable and icon conflict while `clearable` and `icon` options are used. `clearable` should show when this option is enable and the currentValue is not empty, otherwise the `icon` will never be shown.

Table fixed columns support mouse scroll