Bilge opened a new issue #14698:
URL: https://github.com/apache/echarts/issues/14698


   ### Version
   5.0.2
   
   ### Steps to reproduce
   1. Draw overlapping line graphs.
   2. Move mouse over overlapping area.
   
   ### What is expected?
   Chart should display consistently, with one line in front of the other, that 
does not change.
   
   ### What is actually happening?
   As mouse moves over the overlapping area, lines swap foreground/background 
layers in a pseudo-random fashion, as they fight for the foreground layer.
   
   * **Top example** is from different charting software.
   * **Bottom example** is ECharts 5.0.2.
   
   
![GrvyJdZs17](https://user-images.githubusercontent.com/470626/115109194-3d614000-9f6c-11eb-94e1-4a1542029e98.gif)
   
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->


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