Disable Datashader count aggregator self-intersect by default for curves #5975
Description
Describe the solution you'd like
The self-intersect option for a Datashader count aggregator controls whether pixel-crossings of the same line contribute toward a pixel's count.
It was decided that a more reasonable default behavior would be to disable self-intersect by default.
This only makes sense for curves, not paths; self-intersections of paths are usually valuable information.
Additional context
import pandas as pd
import numpy as np
import holoviews as hv
from holoviews.operation.datashader import rasterize
import datashader as ds
hv.extension('bokeh')
self_intersect = True
n_samples = 1000
data = np.random.randn(n_samples)
df = pd.DataFrame({'time': np.arange(len(data)), 'value': data})
hv_curve = rasterize(hv.Curve(df, 'time', 'value'), aggregator=ds.count(self_intersect=self_intersect)).opts(width=600)
hvplot_curve = df.hvplot.line('time', 'value', rasterize=True, aggregator=ds.count(self_intersect=self_intersect))
hv_curve + hvplot_curve