Hi!
In Merlin, the class MerlinMultiSelectionItemsSelectorWidget has the method: newMultiSelectionListFor: aModel list: listSelector primarySelection: primarySelectionSelector changePrimarySelection: changePrimarySelectionSelector listSelection: listSelectionSelector changeListSelection: changeListSelectionSelector
which reference PluggableListMorphOfMany. This class does not exist in Pharo 1.4 and is marked as deprecated in Pharo 1.3.
It would be cool to fix this. I am currently porting Spy to Pharo 1.4, but I am kind of stuck.
Cheers, Alexandre