qcasxy opened a new issue #10627: 自定义系列图表放大后背景异常 URL: https://github.com/apache/incubator-echarts/issues/10627 ### Version 4.2.1 ### Reproduction link [https://www.echartsjs.com/examples/editor.html?c=custom-profile](https://www.echartsjs.com/examples/editor.html?c=custom-profile) ### Steps to reproduce 官方示例中将第3行dataCount变量设置为1000后（模拟大数据情况）点击运行。 图表正常显示，放大图表，左右滑动。 此时背景异常，但是各个图表块显示正常。 ### What is expected? 背景应该为空白的 ### What is actually happening? 背景显示为图表初次显示时的“截图状态”（不知道是否可以理解为画布未清空） --- 数据点较少时没问题，但当数据量达到上千（999都没问题）就会出现该问题 <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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