Holomap of a stack of datashader rasterized Points lose dynamics after converting to layout

[kanglcn]

ALL software version info

holoviews 1.18.0
datashader 0.15.2

Description of expected behavior and the observed behavior

I have a holomap created with a stack of rasterized Points. The direct plotted holomap is dynamically rasterized while the layout of it isn’t.

Complete, minimal, self-contained example code that reproduces the issue

import numpy as np
import pandas as pd
import holoviews as hv
hv.extension('bokeh')
import holoviews.operation.datashader as hd
import datashader as ds

lon = np.array([8.75,8.76,8.77])
lat = np.array([46.1,46.2,46.3])
index = np.array([0,1,2])
dates = np.arange(4)
temp = np.random.random((4,3))

point_stack = {date: hv.Points(pd.DataFrame({'lon':lon,'lat':lat,'temp':temp[i,:]}), kdims=['lon','lat'], vdims=['temp']) for i, date in enumerate(dates)}

hmap = hv.HoloMap(point_stack, kdims='Dates')
hmap = hd.dynspread(hd.rasterize(hmap, aggregator=ds.first('temp'),vdim_prefix=''))

hmap # it plot perfectly

hmap.layout() # it loses the dynamics

Stack traceback and/or browser JavaScript console output

No traceback.

Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this, but my understanding to this package is very shallow.

[jbednar]

I was able to reproduce this, but I'm not sure what's needed to fix it. My best guess isthat the RangeXY streams are being discarded by .layout().