title: Unable to close files in eclipse
body: <p>I have recently upgraded my eclipse to Mars, and .java files that were opened in my previous version are pinned and I'm unable to close.
  In the image, first three .java files: CORSFilter.java, EmailController.java, EmailServiceImpl.java are stuck or pinned. I dont see an 'x' to close when i hover on the tab. I tried opening other files such as Assignment6.java and tried close all, but they still are stuck.</p>
  
  <p>It does cause a havoc for having them there, but its little bothering to look at those windows while working on completely different project.</p>
  
  <p>Thanks in advance.</p>
  
  <p><a href="https://i.stack.imgur.com/oGOjN.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oGOjN.png" alt="enter image description here"></a></p>