This is a finicky change; we need to adapt around bootstrap internals
to first steal focus from the list, and then if the user uses arrow
keys, send that key to the list letting bootstrap focus on the list
elements.
The reverse: stealing abck focus to the input from the list, is not
possible without changing third/bootstrap.js because it's concept of
currently selected item depends on the item being focused. We retain
the pre-commit behavior for this, where the user can SHIFT+TAB to get
back to the input and type.
Ideally, a user will now interact with this widget like this:
1. Click the button to open the widget. The input is in focus.
2. Type a query to filter the results.
3. Seemlessly start using arrow keys to select an option.
4. Press "enter" to select the option.
Rohitt Vashishtha