We recently refactored the Lift Maven layout to remove redundant declarations. One of the redunencies we removed was the declaration of scala-library from all but the lowest dependency (lift-common).
When I open up Lift in IntelliJ (8.1.3 with the latest Scala plugin), all the Scala stuff (e.g., List, PartialFunction, etc.) is marked in red as not found.
Is there some setting that causes Maven dependencies to be searched transitively?