* Source/NSindow.m (-setDelegate:): Don't unregister delegate
        notifications if same delegate is set twice.
        Patch by Doug Simons <doug.simons@testplant.com>


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@36192 72102866-910b-0410-8b05-ffd578937521