Data zoom background is unhelpful for step line series and time series
- Dominant language
- TypeScript
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Description
### Version
4.9.0
### Steps to reproduce
1. Add data series with step line.
2. Add data zoom slider.

Furthermore, it seems to treat the data as categories instead of a time series, even when the corresponding axis is correctly configured as time type. This is also clear because each data point is evenly spaced apart, ignoring the time series.

### What is expected?
Preview should closely match step line data series.
### What is actually happening?
Preview is drawn in regular style, ignoring steps.
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