auto-select suggestion not applied when focus lost

[Marvin1003]

List autocomplete with automatic selection: When the popup is triggered, it presents suggested values that complete or logically correspond to the characters typed in the textbox, and the first suggestion is automatically highlighted as selected. The automatically selected suggestion becomes the value of the textbox when the combobox loses focus unless the user chooses a different suggestion or changes the character string in the textbox.

https://www.w3.org/TR/wai-aria-practices/#combobox

[trevoreyre]

Thank you so much, this change looks great!