User cannot copy data point's colour to itemStyle even though built-in themes can

[Bilge]

Version

4.9.0

Steps to reproduce

By default, itemStyle displays items using data point's colour as its border colour. In "dark" theme, this is reversed so that the item's fill colour is the data point colour. However, it seems there is no way for the user to express this, because series-line.itemStyle.color and series-line.itemStyle.borderColor can only be fixed colours, gradients or textures: they cannot reference the data point's colour.

I also checked the source for the dark theme to see how it was doing this and there is nothing in the code related to changing the itemStyle's colour to match the data point colour.

Default theme	Dark theme

What is expected?

User should be able to set the colour using the data point's colour assigned to it by visualMap.

What is actually happening?

User can only set a fixed colour that is not related to the data point's colour.

I cannot just change the entire theme to get this effect, because (besides being unintuitive) changing the entire theme has other consequences.

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[github-actions]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[Bilge]

no-stale

[github-actions]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[github-actions]

This issue has been automatically closed because it did not have recent activity. If this remains to be a problem with the latest version of Apache ECharts, please open a new issue and link this to it. Thanks!