Use IID instead of ID for "Single issue" query
What does this MR do?
Uses the iid instead of id. If you want a specific issue from a project you can use the single issue query GET /projects/:id/issues/:issue_id
.
Are there points in the code the reviewer needs to double check?
No.
Why was this MR needed?
It is annoying that you can't retrieve an issue from a project without knowing the id visible to the user.
See #617 (closed)