As a user
I want to be able to choose the current top option from the namespace search
so that I can use the keyboard to choose namespaces more quickly
- The namespaces dropdown highlights the current top option in blue. If a user presses enter, that namespace is added. It should behave like the tags selector on phabricator.
- Investigate if the solution can be done as part of OOUI. If it cannot, please report, so we can see if it should be included into OOUI in general