fix(line): normalize the infinite value when calculating the visual gradient.

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Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Resolves #15407. When visualMap is enabled, the line color is unexpected.

Fixed issues

• 当x轴为时间轴时，visualMap展示的颜色不对 #15407

Details

Before: What was the problem?

After: How is it fixed in this PR?

Revert the change brought by #14602 in LineView.ts and normalize the infinite value

echarts/src/chart/line/LineView.ts

Line 246 in cf7c4ef

coord: axis.toGlobalCoord(axis.dataToCoord(stop.value, true)),

Misc

• The API has been changed (apache/echarts-doc#xxx).
• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

Please refer to test/linear-gradient.html.

Others

Merging options

• Please squash the commits into a single one when merge.

Other information

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[echarts-bot]

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