20018
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Issue 5709: #getSourceFromFile should not be called from external clients
http://code.google.com/p/pharo/issues/detail?id=5709
Issue 5648: self world in HaloMorph is nil
http://code.google.com/p/pharo/issues/detail?id=5648
Issue 5666: Unable to open the menu with one click mouse (again)
http://code.google.com/p/pharo/issues/detail?id=5666
Issue 5619: PluggableListMorph drag/drop raise DNU
http://code.google.com/p/pharo/issues/detail?id=5619-- Marcus Denker -- http://marcusdenker.de
