14136
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Issue 4793: Minor fix on FlatMessageListBrowser
http://code.google.com/p/pharo/issues/detail?id=4793
Issue 4790: Fix the Drag and drop in multi selection list
http://code.google.com/p/pharo/issues/detail?id=4790
Issue 4788: Dont use PluggaleListMorphOfMany anymore
http://code.google.com/p/pharo/issues/detail?id=4788
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Marcus Denker -- http://marcusdenker.de
