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the action is not fired.
I tried the same action with a SC.ButtonView and the action is fired.
Writing an explicit target doesn't fix the problem.
The action should be fired on doubleClick.
To elaborate, @amiorin reported that he was able to get the action to fire by making it a local function on the ListItemView.
I haven't repro'd personally, but the symptoms sound like ListItemView is using the old school action-as-function paradigm and never got updated to the newer target/action paradigm. Funny thing though is that I don't see any action handling built into ListItemView at all, so why would action-as-function work?
Yeah, sorry, action/target is supposed to be set on the collection view (see http://docs.sproutcore.com/#doc=SC.CollectionView&method=action&src=false). The collection view handles all the user interaction, not the item views that it creates.