For as long as I've used Xcode, the Issue navigator shows stale errors and warnings even after the build is completely building and executing. It would be nice to have a way to retain file warnings without having to set "warnings as errors", but here the problems have already been fixed.
Also need a "Reveal in Report Navigator" since half the time these errors/warnings lack 90% of the info needed to actually fix them. There's already a "Reveal in Project Navigator" that is almost never needed.