Thanks, can you please provide an example that demonstrates the fix?

@cpsievert to reproduce, run the following in R:

library(crosstalk)
library(plotly)
library(DT)

data(iris)

shared_iris <- SharedData$new(iris)

a <- plot_ly(shared_iris, x = ~Sepal.Length, y = ~Sepal.Width) %>%
    add_markers() %>%
    highlight(on = "plotly_click", dynamic = TRUE)
b <- datatable(shared_iris)

bscols(
    list(
        filter_checkbox("species", "Species", shared_iris, ~Species)
    ),
    a, b 
)

Then select some points in the plotly visual, open up the browser console and run the following:

const handleId = Object.keys(__crosstalk_groups)[1]
const myHandle = new crosstalk.SelectionHandle(handleId)
myHandle.clear()

In the main branch code, this throws an error and the selection is not cleared. Using the version in this PR, no error is thrown and the crosstalk selection is successfully cleared.

@cpsievert would it be possible to have a look at merging this fix? I ran into this issue today. Thanks!