Is your feature request related to a problem? Please describe.
When I try to assign someone to test cases in the test run view, I am expected to enter the username/email/userid and there is no shortlist provided as I type.

Describe the solution you'd like
As I type a username or email I would like the available entries in the DB to be provided as a short list.

Describe alternatives you've considered
I dont see any alternatives.

Additional context