title: Xcode: How to temporarily hide yellow warnings from Issue Navigator
body: <p>I'm working on a project (written by another developer...) with LOTS of yellow warnings.
  During the build process, if there is a critical (red) error, the error keeps moving down beyond the bottom of the left pane, and it's always taking me some time until I can finally point the mouse at it and look at the error.
  Is there a way of showing only the red (critical) errors? </p>