[Pharo-project] [update 2.0] #20473

[Marcus Denker]

20473
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Issue 7219:     SubscriptOutOfBound error in GoBackStringMorph
        http://code.google.com/p/pharo/issues/detail?id=7219


Diff information:
http://ss3.gemstone.com/ss/Pharo20/NautilusCommon-MarcusDenker.106.diff