tmtron opened a new issue #10082: Linechart zoom shows wrong preview URL: https://github.com/apache/incubator-echarts/issues/10082 ### Version 4.2.1-rc1 ### Reproduction link [https://jsfiddle.net/tmtron/0beLxwh2/21/](https://jsfiddle.net/tmtron/0beLxwh2/21/) ### Steps to reproduce - add a null datapoint at 1995 - add some data between 1997 and 2000 - add a final null datapoint at 2005 ### What is expected? the zoom slider background data should show the real data in the middle of the slider ### What is actually happening? The data in the zoom slider is stretched. I think this is a bug, unless I am missing some settings (but I could not find any switches on the zoom-slider to make this work) --- The following screenshot shows the issue. The area outside of the yellow highlighted rectangle in the zoom range (1) should not be visible.  see also: related [Stackoverflow question](https://stackoverflow.com/questions/55062223/linechart-zoom-shows-wrong-preview) <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE --> <!-- This issue is in English. DO NOT REMOVE -->
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