Selection tool is broken on the latest master

[peterroelants]

Description of expected behavior and the observed behavior

The selection tool on only works for the first selection made on the plot, and fails for all further selections. No warnings or errors to be seen.

This is observed on latest master (6449bb4) and does not happen on the v1.14.4 tag with id f7a923065

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

import numpy as np
import pandas as pd
import datashader as ds
import holoviews.operation.datashader as hd
import holoviews as hv
from holoviews.selection import link_selections

hv.extension('bokeh')

num = 100000
np.random.seed(1)

dists = {
    cat: pd.DataFrame({
        'x': np.random.normal(x, s, num), 
        'y': np.random.normal(y, s, num), 
        'val': np.random.normal(val, 1.5, num), 
        'cat': cat
    }) for x,  y,  s,  val, cat in 
     [(  2,  2, 0.03, 10, "d1"), 
      (  2, -2, 0.10, 20, "d2"), 
      ( -2, -2, 0.50, 30, "d3"), 
      ( -2,  2, 1.00, 40, "d4"), 
      (  0,  0, 3.00, 50, "d5")]
}

points = hv.Points(pd.concat(dists), ['x', 'y'], ['val', 'cat'])
datashaded = hd.datashade(points, aggregator=ds.count_cat('cat'))
spreaded = hd.dynspread(datashaded, threshold=0.50, how='over').opts(tools=['box_select', 'lasso_select'])

# Declare dim expression to color by cluster
dim_expr = ((0.1+hv.dim('val')/10).round()).categorize(hv.Cycle('Set1').values)
histogram = points.hist(num_bins=60, adjoin=False, normed=False).opts(color=dim_expr)

link_selections(spreaded + histogram) 

Screenshots or screencasts of the bug in action

• On latest master (id=6449bb4):
  
• On v1.14.4 tag (id=f7a923065)
  

ALL software version info

pip-freeze.txt

[github-actions]

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