title: Why do I get an autolayout error on a constraint that should not be installed for the size class?
body: <p>I'm using iOS 8. My nib has autolayout and size classes enabled. I've made two layouts in IB, one for Any Width/Any Height, and one for Any Width/Compact Height. I've tested different orientations and device sizes in IB and I don't have constraint problems in IB.</p>
  
  <p>Now when I run the app on my phone. The view lays out correctly in portrait. Then I rotate my phone into landscape and I get a "Unable to simultaneously satisfy constraints." error. When I look at the list of conflicting constraints, I see a constraint that should have been uninstalled for landscape layouts. When rotation completes the landscape layout appears correctly.</p>
  
  <p>It's as if iOS is trying to lay out the view with the new bounds before the old constraints are uninstalled. Is this a known problem with iOS? Is there a step I need to implement to correctly support size classes?</p>