### 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 -->

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