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

[Sašo Kiselkov]

Follow-up Comment #1, bug #14488 (project gnustep):

I've found a bug in the NSUndoManager code which caused my app to crash.
NSUndoManager doesn't tell the invocation to retain it's arguments when doing
invocation-based undo. The patch is as simple as adding

[anInvocation retainArguments];

into the method -[NSUndoManager forwardInvocation:].

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