Bounds example doesn't work with BoundsXY

[timothydmorton]

Trying to use the bounds example for reference and holoviews is telling me I should use BoundsXY because Bounds is deprecated. But when I do that replacement in the demo code, it doesn't work. No error as far as I can tell, but it doesn't work.

[philippjfr]

Looks like the BoundsXY callback was never registered:

https://github.com/ioam/holoviews/blob/master/holoviews/plotting/bokeh/callbacks.py#L767

A straightforward workaround until we fix this is to register the callback yourself:

from holoviews.plotting.bokeh.callbacks import BoundsCallback
hv.streams.Stream._callbacks['bokeh'][hv.streams.BoundsXY]      = BoundsCallback

[timothydmorton]

ok, so that worked on an example, but it doesn't seem to work on a datashaded image. That is, I get the persistent black box when I use Bounds but not BoundsXY. Is there something additional that needs to be registered for an RGB or something?

[timothydmorton]

oh wait, maybe this is not related to this; I'm getting IOPub data rate errors from my notebook, so maybe that's why it's not working properly.

[timothydmorton]

OK, my code is working with BoundsXY now.

[philippjfr]

Added the stream in the PR above. Closing.

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