title: Is there a way to quickly select which file is displayed in Xcode's Assistant Editor?
body: <p>My current way of selecting the file to be used in the Assistant Editor is quite cumbersome if I don't just want the automatic counterpart. I have to choose manual, then navigate all the way to the file.</p>
  
  <p>Is there a way to use something like the Open Quickly dialog (command-shift-o) but have it apply to the Assistant Editor? Or even just a faster way than navigating through a list of files?</p>