No hover is shown if rasterized inside dynamicmap using apply_when-like logic

[ahuang11]

import holoviews as hv
import random


def plot(x_range, y_range):
    points = hv.Points(([0, 0], [0, 0])).opts(
        tools=["hover"], projection=ccrs.GOOGLE_MERCATOR
    )
    if random.choice([True, False]) or x_range is None:
        points = rasterize(points, dynamic=False)
    return hv.Overlay(
        [
            points,
        ]
    ).opts("Points", tools=["hover", "box_select"])


hv.DynamicMap(plot, streams=[hv.streams.RangeXY()])

Hover doesn't work if rasterized first.

It works if not rasterized first.

[ahuang11]

The not-so-workaround is setting points alpha to 0, but I'm sure it has performance implications.

import holoviews as hv
import random


def plot(x_range, y_range):
    points = hv.Points(([0, 0], [0, 0])).opts(
        tools=["hover"], projection=ccrs.GOOGLE_MERCATOR
    )
    raster = rasterize(points, dynamic=False)
    if len(points > 1000):
        points.opts(alpha=0)
    return points * raster

hv.DynamicMap(plot, streams=[hv.streams.RangeXY()])

[hoxbro]

I think this is the same underlying issue as reported in #5981