[Oberon] PO2013 - System.CloseTrack / System.ExtendDisplay

[Paul Reed]

> When doing the same in Native Oberon (on PC), you can recover by
> pressing Ctrl+Break, since Native Oberon's TRAP handler will open a new
> log viewer if the log viewer has been closed.
> 
> But I just tested it in PO2013, this "safety precaution" is not
> implemented there. But probably not hard to add if anyone needs it :-)

A quick and crude way would be to add a call to OpenViewers just before 
Oberon.Reset in System.Abort.  It would also give a more striking visual 
feedback for the reset button being pressed (or F12 if you're in Peter 
de Wachter's emulator), rather than just the rather humble "ABORT" 
message in the log.

But this doesn't help if you do my favourite, which is System.Free 
System...

For a single-user system in the hands of someone who's had at least a 
quick overview, these little "gotchas" are within proportion, 
considering the efficiency, satisfying responsiveness, and vast 
reduction in complexity compared with a multi-user system which must 
remain up and safe, no matter what one user manages to do.  Everyone is 
still working on achieving the latter.