[Pharo-project] [update 1.4] #14019

[Marcus Denker]

14019
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 Issue 4391:    Support grouping windows as tab
                http://code.google.com/p/pharo/issues/detail?id=4391


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Marcus Denker  -- http://www.marcusdenker.de
INRIA Lille -- Nord Europe. Team RMoD.