Autocomplete user when adding to a project

[jerr0328]

Is your feature request related to a problem? Please describe. When I need to add a user to a project, I have to remember what their username is. Because usernames are case-sensitive, I also need to make sure I type it exactly. A wrong case somewhere and I get a user that doesn't exist.

Describe the solution you'd like Autocomplete/suggestions as I start typing. This ideally would cover username and real name (e.g. if Alice has account al1ce and Bob has account RobertLongUs3rn4m3, typing Al should suggest Alice's account, and Bob should suggest Bob's account, similarly al1 and rob should resolve accordingly). That said, any suggestion would be helpful, so using standard libraries that do this would be amazing (even if it only worked on usernames, that would help validate the name before submitting).

Describe alternatives you've considered Right now I go to Github, find the user somewhere in the repo (like a recent commit), and copy the username. Alternatively, having a dropdown of users could work, although this probably doesn't scale as nicely as an autocomplete box.

Additional context Github's autocomplete feature on issues and PRs inspires this.