title: Remove the folder added to Project
body: <p>I accidently selected 'Add files to my project' and added my project file itself once again in my project. Now when I delete that added folder, then all the classes and folders previously present is shown as deleted. Now if I drag the file again, things are again fine.</p>
  
  <p>How can I delete the folder that I added to my project without affecting other files/classes...?</p>