### One-line summary
If legend item is to big and did not fit in the legend width then scrolling is 
not working. Below I give an example when I have a large string and legend 
width is 500. If I click on the scroll button did not happen anything. 




### Version & Environment
+ ECharts version [ECharts 4.0.4]:
+ Browser version [Chrome version 68]:
+ OS Version [everywhere]:





### Expected behaviour
Scroll should work




### ECharts option
    legend: {
        type: 'scroll',
        width: 500,
        data: ['This is a very long legend item which is not fitting in the 
legend width just with scroll']
    },




### Other comments]
<!-- For example: Screenshot or Online demo -->
![image](https://user-images.githubusercontent.com/42805263/44786819-02812280-ab9e-11e8-90a8-c1fce42e63c7.png)



[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/8971 ]
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