id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
548483156,MDU6SXNzdWU1NDg0ODMxNTY=,3687,imshow RGB plot overlaps map borders when using projection,29065166,closed,0,,,5,2020-01-11T21:36:03Z,2020-01-18T10:55:51Z,2020-01-18T10:55:51Z,NONE,,,,"
xarry version: '0.14.0'
matplotlib version: '3.1.1'

When I create an RGB plot using `ds.plot.imshow` with a procection, the plot overlaps the map borders:

    import cartopy.crs as ccrs
    import xarray
    import matplotlib.pyplot as plt
    
    ds = xr.load_dataset(...)
    
    ax = plt.subplot(projection=ccrs.Robinson())
    (ds.isel(time=[0, 4, 8])).plot.imshow(robust=True, ax=ax, transform=ccrs.PlateCarree())

[![RGB plot][1]][1]

When using `ds.plot.imshow` with a single layer, the plot looks as expected:

    import cartopy.crs as ccrs
    import xarray
    import matplotlib.pyplot as plt
    
    ds = xr.load_dataset(...)
    
    ax = plt.subplot(projection=ccrs.Robinson())
    (ds.isel(time=0)).plot.imshow(robust=True, ax=ax, transform=ccrs.PlateCarree(), add_colorbar=False)

[![single layer plot][2]][2]

  [1]: https://i.stack.imgur.com/wRdSz.png
  [2]: https://i.stack.imgur.com/3Jb6q.png","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/3687/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue