For the multiselectbox component, I would like the option to have a prefix component, similar to what is available with a regular combobox. I believe this would significantly improve the user experience, as the prefix component is very useful for additional inputs or similar purposes. Essentially, this would help to unify the user experience."
GitHub is more suited for Feature Requests. P.S. You can update this: Prefix for Multi-Select-ComboBox · Issue #6858 · vaadin/web-components · GitHub
@knoobie could such prefix component be used to implement a select all / deselect all mechanism then? Because that’s badly needed as well i find on the multiselectbox.
There are two issues about that feature request - the second has some kind of idea / hack