On our-own-kallithea, trying to invite 'Søren Løvborg' as reviewer on a PR does not autocomplete: 'S' shows him in the list, but neither do 'So' and 'Sø'.
Yes, I saw that too. Very annoying.
Yup. I thank my parents for making me a living, breathing I18N test case. ;-)
That part is still using YUI. It will probably be fixed when moving away from that. I wouldn't invest in fixing it in YUI.
Problem is gone on current Kallithea default branch