Smoother copy+paste in selectizeInput

[whtns]

I'm interested in having a selectizeinput that allows copy+paste in both directions (into the selectize field and out of it). I thought this project might be a good place for this.

See these questions for context:
Copy and paste text in selectizeInput in a Shiny application
Pasting multiple items into selectizeInput

The current solution doesn't seem to interact well with shiny::updateSelectizeInput

Thank you for all the widgets!