apache / apache/echarts

Data zoom background is unhelpful for step line series and time series

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bug en
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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.

![image](https://user-images.githubusercontent.com/470626/95594172-7f9c4880-0a42-11eb-9687-b8d0160be5ea.png)

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.

![image](https://user-images.githubusercontent.com/470626/95595111-b9218380-0a43-11eb-8916-5f6ef6ba64c1.png)

### 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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