HoloMap of Overlay of hv.Surface

[basnijholt]

energies = np.linspace(-np.pi, np.pi, 30 * 30).reshape((30, 30))**2
plot = lambda i: holoviews.Surface(i*energies) * holoviews.Surface(-i*energies)

then running:

plot(1) + plot(4)

gives

but

holoviews.HoloMap({i: plot(i) for i in range(10)})

gives

I would think holoviews.HoloMap({i: plot(i) for i in range(10)}).collate() would do the job, but it doesn't.

[philippjfr]

Fixed in #505. Closing.