move dependency mapping to IvySbt#Module

ivy/Ivy.scala

@@ -108,6 +108,11 @@ final class IvySbt(val configuration: IvyConfiguration)
 			withIvy[T](log) { ivy => f(ivy, moduleDescriptor0, defaultConfig0) }
 
 		def moduleDescriptor(log: Logger): DefaultModuleDescriptor = withModule(log)((_,md,_) => md)
+		def dependencyMapping(log: Logger): (ModuleRevisionId, ModuleDescriptor) =
+		{
+			val md = moduleDescriptor(log)
+			(md.getModuleRevisionId, md)
+		}
 		def defaultConfig(log: Logger): String = withModule(log)( (_,_,dc) => dc)
 		// these should only be referenced by withModule because lazy vals synchronize on this object
 		// withIvy explicitly locks the IvySbt object, so they have to be done in the right order to avoid deadlock

main/Defaults.scala

@@ -747,10 +747,7 @@ object Classpaths
 
 	def depMap(projects: Seq[(ProjectRef,ResolvedProject)], data: Settings[Scope], log: Logger): Task[Map[ModuleRevisionId, ModuleDescriptor]] =
 		projects.flatMap { case (p,_) => ivyModule in p get data }.join.map { mods =>
-			(mods.map{ mod =>
-				val md = mod.moduleDescriptor(log)
-				(md.getModuleRevisionId, md)
-			}).toMap
+			mods map { _.dependencyMapping(log) } toMap ;
 		}
 
 	def projectResolverTask: Initialize[Task[Resolver]] =