[Bug] 渲染模式为svg时 toolbox.feature.saveAsImage. backgroundColor 属性无效
Open
bug
SVG
topic: toolbox
- Dominant language
- TypeScript
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- Avg merge
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Description
### Version
5.4.2
### Link to Minimal Reproduction
无
### Steps to Reproduce
无
### Current Behavior
渲染模式为svg时，无法设置下载图片的背景色
### Expected Behavior
可以设置下载背景色
### Environment
```markdown
- OS:
- Browser:
- Framework:
```
### Any additional comments?
_No response_
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