When opening perspectives in new windows, things got
messed up. A detailed investigation is required for all
the scenarios, but for now these are the issues:
- when opening the Compare perspective in a new window
a file panel is also shown by default!
- when closing the Compare perspective's window
JCommander displays the exit confirmation dialog.
Fortunately if pressing OK JCommander only closes the
window, but does not exit. It pretty much confusing though.