Incubator-echarts: visualMap dimension参数使用异常

[linwei-yoh]

Version 4.8.0

Reproduction link

https://gallery.echartsjs.com/editor.html?c=xhXjIxXGPw&comment=0

Steps to reproduce

1.直接运行能看到一个连线断开的效果.
2.将visualMap.dimension从0改为2,再运行.

What is expected?

dimension等于0或2时候,因为对应维度下的值一致,期望得到的效果也一致

What is actually happening?

dimension = 2时,点变色单连线没断开

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因为在二维数据情况下,希望某两个点之间的连线不显示. 根据文档描述,期望通过增加一个存储序号的维度数据,使用visualMap来进行显示筛选.
但是实际测试发现,修改用例的dimension在0和1的时候才能,根据配置的pieces达到预期效果.
而无法通过额外增加的维度数据来筛选.

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[susiwen8]

Same with #12818

[linwei-yoh]

thanks...