Clone of current session contains what was in the session on previous load

1. Start Creator.
2. Create and open a session.
3. Open a file.
   Let's call this file A.
4. Open the default session.
   No more file is open.
5. Open the session from step 2 again.
   File A is open again.
6. Close file A and open a different file.
7. Clone the current session and open the cloned session.
   File A is open again.

The cloned session should contain what was in the session at the moment of cloning, i.e. instead of file A, the file opened in step 6 should be open.