issue_comments: 609401377

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https://github.com/pydata/xarray/pull/3915#issuecomment-609401377 https://api.github.com/repos/pydata/xarray/issues/3915 609401377 MDEyOklzc3VlQ29tbWVudDYwOTQwMTM3Nw== 10194086 2020-04-05T11:27:22Z 2020-04-05T11:27:22Z MEMBER

The MWE in #3569 throws an error after #3916 (ValueError("Cannot supply vmin and a norm with a different vmin.")) - maybe it is enough to test that it works again?

I reverted to before #3569 and tried to figure out the difference in the QuadContourSet in terms of norm and some other properties of h and facet._mappables[0] is and couldn't figure it out.

```python h = ds[0].plot.contour(levels=[4], colors=['k']) facet = ds.plot.contour(col='time', levels=[4], colors=['k'])

```

 
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