In T252084#6180571, @Demian wrote:

One more hint would be to show more users. It seems to me the logic does not lists users, that will appear later when I type more characters. An example to demonstrate what I mean:

1. I type @p -> the list shows only 2 users: PauTest, PPelberg-test
2. @pp -> PPelberg-test
3. @ppp -> Ppppowerup
4. I delete that last character, @pp -> PPelberg-test, Ppppowerup

I'd expect Ppppowerup or another name with "pp" in it to show up for ˙@pp` and possibly @p initially too, not just after backspace-ing.

Expected behaviour:
Typing @p should show a list of "local" users beginning with 'p', followed by results from the API ("local" being users who have commented in the thread).