title: Xcode 8 red files but not missing
body: <p>I just saw a weird error on one of my iOS projects.
  I'm using Xcode 8 (last release). I have some classes that I share along with other projects. This files are added to the project by reference, in case I need to edit them, I do it just once. 
  Everything works fine. But I saw that many of this files are on red in one of my projects. The weird thing is that everything works well. All libraries are included, everything runs perfectly. Like I said, the files are marked as red and I can not edit them directly from that project but they are not missing (paths are OK), I cannot go directly to the folder using "show on finder" option.</p>
  
  <p>I tried replacing the folders. Also tried to added and copy them to the project folder. But nothing seems to be working.
  I know, there are many threads about this issue but none of them worked for me because my files are not missing.</p>
  
  <p>Did someone see this issue?</p>
  
  <p>PS. I'm using git.</p>