Visual glitch in stacked line chart (bridges end and start points)

[ope-nz]

Version

5.1.2

Reproduction link

https://jsfiddle.net/b1kcr42a/1/

Steps to reproduce

Create a stacked chart with several data series. Sometimes there will be a visual glicth that appears to bridge the end and start points of a series in the chart. Sometime this will occur for many series.

What is expected?

The stacked chart draws without issues

What is actually happening?

A visual glitch that appears to bridge the end and start points of a series

---

This problem occurs in 5.1.2 but not in 5.0.0 - I havent not tested version in between.

5.1.2

5.0.0

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[ope-nz]

I have now tested on 5.1.1 and the issue is not present.

[plainheart]

The issue reported by #15372 may be the same as this issue. It seems related to ecomfe/zrender#760.

@pissang Please help take a look.

[plainheart]

Note that, this error case needs us to enable stack mode and specify some very small values, such as 0.1 or 0.2 in this case. If we increase it slightly, this issue will disappear.

[echarts-bot]

This issue is labeled with priority: high, which means it's a frequently asked problem and we will fix it ASAP.