Multiple select Widget allows selecting same option multiple times

[OdifYltsaeb]

1. Go: http://onefinestay.github.io/react-choice/
2. choose angola from the drop-down.
3. type angola into search-input and
4. choose it again from the drop-down

[AndrewIngram]

oooh, nice spot!

[OdifYltsaeb]

In addition to that - if you select options, then type something in filter input, but then delete all the text you previously typed (ctrl +a, del), then list is rendered with all possible options, including the ones you have already chosen.