Legend entries with hv.Area

[PeterDSteinberg]

Currently it is not apparent how to add legend entries for hv.Area items

I created the figure below with 3 hv.Curve items that show up in legend but the 2 hv.Area items are plotted without legend labels.

mx = ds.data.flow.values.max()
s = lambda c: c.opts(style={'Area': {'fill_alpha': 0.3}})
f,t,c,i,w = (hv.Curve(ds.data.flow, label='Flow (GPM)'),
           hv.Curve(ds.data.temp, label='Temperature (F)'),
           hv.Curve(ds.data.cond, label='Conductivity (uS/cm)'),
           s(hv.Area(ds.data.is_illicit * mx * 0.4, label='Has Illicit Discharge (1=Yes)')),
           s(hv.Area(ds.data.did_warning * mx * 0.6, label='Created a warning (1=yes)')))

Note from @philippjfr on solving this:

The Areas are drawn using bokeh's Band glyph which does not currently support legend entries. Would you mind filing an issue with holoviews about this and then I'll try to follow up with bokeh to see if there's something we can do about that?

[philippjfr]

This should now be fixed by #2225.

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