EWChina999 opened a new issue, #17200:
URL: https://github.com/apache/echarts/issues/17200

   ### What problem does this feature solve?
   
   It would be useful if you could improve the series line highlight, 
especially on charts with many lines . 
   
   the example is http://jsfiddle.net/vitorbarbosa/qpByN/
   
   
   ### What does the proposed API look like?
   
   Only highlight the data series when mouse moves over the legend , at same 
time dimming the rest of series .
   
   
![image](https://user-images.githubusercontent.com/104311689/173190281-fcf6ee32-96be-4f80-adda-f893c89df185.png)
   


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