Confusing selected states when using multiple selection methods

[neilmiddleton]

It's possible to have more than one 'selected' item in the dropdown.

To replicate:

Using the top example at https://alphagov.github.io/accessible-autocomplete/examples/.

• Enter 'U' into the select box
• Hover the mouse over an item
• Use the arrow down to select a different item
• Note that two items now have a selected state
• On Enter, the last selected item is chosen.