Open
Description
When mentioning someone, the mention completion only mentions people inside my own org (or only the owner, if I'm in a user repository). Thats probaly fine for private repos, but for public ones?
Ideally, it should autocomplete
a) everyone, if the current issue is in a public repo
b) only people with access to the repo, if its a private one. This would include team members of an organisation (I think actually everyone within an organisation who is in a team with read access + issuetracker/pr) and added members via settings (because user repos can also add members for collaboration).
\cc @harryxu