For reason unknown to me, Xcode 9 started to duplicate some (most) of the issues (errors and warnings both). It adds 'Uncategorized' group in the Issue navigator and also displays each of them twice in the code.
Not like it's critical, but uncomfortable.
The question is, have I unknowingly turned this on somewhere or is this a default behaviour for Xcode 9?
I'm using Xcode 9.1 + Swift 4 currently, but it happened also with Xcode 9 + Swift 3.
Thanks.