20622
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11639 Backport Pharo2.0: Memory leak when using weak announcements with blocks
https://pharo.fogbugz.com/f/cases/11639(pass 1/2) Diff information: http://ss3.gemstone.com/ss/Pharo20/System-Support-EstebanLorenzano.805.diff http://ss3.gemstone.com/ss/Pharo20/Spec-Widgets-EstebanLorenzano.111.diff http://ss3.gemstone.com/ss/Pharo20/Spec-Tools-EstebanLorenzano.91.diff http://ss3.gemstone.com/ss/Pharo20/Spec-Core-EstebanLorenzano.90.diff http://ss3.gemstone.com/ss/Pharo20/Manifest-CriticBrowser-EstebanLorenzano.66.diff http://ss3.gemstone.com/ss/Pharo20/Collections-Weak-EstebanLorenzano.71.diff http://ss3.gemstone.com/ss/Pharo20/Announcements-Core-EstebanLorenzano.40.diff
