hover broken for datashade

[ahuang11]

import pandas as pd
import hvplot.pandas

tst = pd.DataFrame([0, 1, 2])

tst.hvplot('index', 0, datashade=True)

[philippjfr]

Yeah, we should suppress hover for datashade output by default since it's not useful and fix the underlying issue in holoviews.

[philippjfr]

The RGBA value is now displayed but as a int which is useless so we should disable it.

[jbednar]

I'd prefer to display it as hex or a four tuple, rather that omit it, but I don't know how difficult that is.

[philippjfr]

That's a holoviews issue, the issue here is that hvplot displays hover info by default but I do not think it should do so for RGB by default, even if it was a hex.

[jsignell]

I think suppressing hover for datashade, or at least disabling it by default will close #271

[jsignell]

Nah nevermind, it's unrelated to #271 other than that hover is broken.