title: Xcode standard editor shows wrong file (with correct location) while assistant editor shows the correct one
body: <p>I have a project folder, and another projectBackup folder next to it.
  Yesterday I was working on my project, and by mistake, I opened another Xcode project, directly realized and closed Xcode.</p>
  
  <p>I reopened my project with Xcode and I can see that all my outlets look disconnected in the standard editor.
  I check the location of the open file, and it shows the correct one.
  When I open the storyboard and the same viewController in assistant editor, I get the correct one (checked the location) - with the connected outlets.</p>
  
  <p>I removed the content of DerivedData folder - but it didn't help.</p>
  
  <p>What is this bug, how can I fix it?</p>
  
  <blockquote>
    <p><em>Edit</em>: Just for info, I did a test : created a new project, copied the folder of the project and pasted it next to it, opened the first
    one, then the second. Closed both and Boom, outlet connections
    disapeared (But the application still works)</p>
  </blockquote>