title: Xcode 9 fail to add target membership
body: <p>After update to latest XCode 9 i mention that after i drag files to project and checkmark (add files to target ) is on, still, files is added without checked target membership.</p>
  
  <p>It is really frustrating, sometimes you may need to add whole library to project, and i finished up checking each file and put checkmark to target membership.</p>
  
  <p>Is there any way to fix it?</p>