typeahead adds showClass to wrong element

[lukpep]

"show" or "open" class are added to div with class dropdown instead of div 'dropdown-menu' - making it dosent show dropdown on bootstrap 4.0.0-beta

[cluka]

Agree, I have the same issue.

[thejaff2]

I have successully lifted clukas code to be able to use typeahead now with bs4. Another thing I'm not getting to work though: typeahead within an input group. I have only tried adding input-class='form-control' but that didn't do it.