fix(visualMap): fix continuous visualMap mouseover event not register except first countinous visualMap

[linghaoSu]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

fix multi continous visualMap , when element hovered, the visualMap not show indicator except the first one.

Fixed issues

• fix Only 1 visual map indicates value if there are multiple visual maps. #19065

Details

Before	After

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Others

Merging options

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

Other information

[echarts-bot]

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The pull request is marked to be PR: author is committer because you are a committer of this project.

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19097@97e3fa9

[plainheart]

There is an existing PR #17252 targeting to fix the same bug. I would suggest you read my review there and improve the fix strategy.

[linghaoSu]

There is an existing PR #17252 targeting to fix the same bug. I would suggest you read my review there and improve the fix strategy.

change fix strategy depends these review there.

[echarts-bot]

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