[bug #14488] NSUndoManager doesn't retain invocation.

[Sašo Kiselkov]

Follow-up Comment #3, bug #14488 (project gnustep):

We've already investigated in the mean time together with Quentin - the
correct (Cocoa-conforming) solution. In Cocoa there is a special subclass
called _NSUndoInvocation which retains it's arguments doesn't retain the
target, as retaining the target would result in a retain-loop (the target of
undo operations is usually the same object as the one which owns the undo
manager).

I've created a fix for this bug by modifying NSInvocation to include a method
named -retainArgumentsIncludingTarget: where the sender can explicitly define
whether or not retain the target, and also modified NSUndoManager.m to use
it. Quentin should put it into CVS some time soon. The fix is available at
http://openspace.adlerka.sk/NSUndoManagerFix.tar.gz .

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