[bug #16688] "NSInvalidArgumentException: stopModalWithCode: when not in modal session" when hitting return in textfield.

[Richard Frith-Macdonald]

Follow-up Comment #5, bug #16688 (project gnustep):

We can easily fix the save and open panel code by disabling the 'ok' button
when the panel is not in use.  However, it seems to me that there ought to be
some automatic/better way of doing things.  Other panels may have similar
problems and may not be created programatically (eg they are Gorm files) and
cannot therefore easily have their buttons disabled when they are closed.
Perhaps there is some behavior that should be implemented that we are missing
... maybe all controls on a closed window should return NO for isEnabled or
something like that.

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