fix(label): fix labels are not on the top bug.

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fix a bug that label is not on the top of line/area, which is affecting many cases of the label.

Fixed issues

• The label is showing below the line and area when showSymbol is false #14541
• ECharts Sankey: Labels are hidden under lines with line emphasis #14287
• Fix(sankey): sankey label has higher z2 #14417 (revert)
• Fix(markline): markline label should have higher z #14202 (tweak)

Details

Before: What was the problem?

After: How is it fixed in this PR?

Usage

Are there any API changes?

• The API has been changed.

Related test cases or examples to use the new APIs

Please refer to

• test/sankey-*.html
• test/markline.html
• The demos provided by The label is showing below the line and area when showSymbol is false #14541

Others

Merging options

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

Other information

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[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍