[bug #25572] NSSavePanel/NSOpenPanel return an instance variable instead of object copy

[Fred Kiefer]

Follow-up Comment #1, bug #25572 (project gnustep):

GNUstep really should be doing more copying when setting or returning
instance variables. This is out of question. Your specific solution may not
the the most efficient one. I will probably replace 
return [NSString stringWithString:_directory];
with 
return AUTORELEASE([_directory copy]);

Here immutable subclasses of NSString may decide to not copy themselves and
in your case a new object is created every time.

On the other hand your application is also at fault, it relies on the fact
that an object returned by a method will stay around. This is never
guarrantied, you always need to retain objects yourself, when you need to use
them later on.

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