Gallery: wind plot missing lake features

[rcomer]

📚 Documentation

The Plotting Wind Direction Using Quiver example uses NaturalEarth to add lake outlines. But those outlines don't actually show up in the displayed plots. It looks like they disappeared at Iris 2.1:

• Iris 2.0 version
• Iris 2.1 version

[rcomer]

grep confirms that this is the only example that uses cartopy.feature

[rcomer]

Running this example locally:

• I do not get the lake outlines with Iris3.0.1 (default-next).
• I do get the lake outlines with my iris-dev environment, which still has Cartopy 0.18. Also the gallerytest fails.

[rcomer]

There were some changes to edgecolor handling for Matplotlib v3.4: https://matplotlib.org/stable/users/whats_new.html#collection-color-specification-and-mapping

So I think the gallery example is fixed, but we need to update the reference imagehash.

[jamesp]

@rcomer agree, editing the gallery test file I see the same. the outlines are in my dev version, if I comment out ax.add_feature(lakes) the test will pass.

Agree the thing to do here is add the new image hash.