Correct classpath for plugins

launch/Launch.scala

@@ -110,6 +110,7 @@ class Launch(val bootDirectory: File, repositories: List[Repository]) extends xs
 			def target = new UpdateApp(Application(id))
 			def failLabel = id.name + " " + id.version
 			def lockFile = updateLockFile
+			def mainClasspath = classpath
 
 			lazy val mainClass: Class[T] forSome { type T <: xsbti.AppMain } =
 			{

launch/Provider.scala

@@ -15,6 +15,8 @@ trait Provider extends NotNull
 	def parentLoader: ClassLoader
 	def lockFile: File
 
+	def classpath = Provider.getJars(baseDirectories)
+		
 	def retrieveFailed: Nothing = fail("")
 	def retrieveCorrupt(missing: Iterable[String]): Nothing = fail(": missing " + missing.mkString(", "))
 	private def fail(extra: String) =
@@ -44,7 +46,7 @@ trait Provider extends NotNull
 		}
 		def createLoader =
 		{
-			val jars = Provider.getJars(baseDirectories)
+			val jars = classpath
 			(jars, new URLClassLoader(jars.map(_.toURI.toURL), parentLoader) )
 		}
 	}

launch/interface/src/main/java/xsbti/AppProvider.java

@@ -1,5 +1,7 @@
 package xsbti;
 
+import java.io.File;
+
 public interface AppProvider
 {
 	/** Returns the ScalaProvider that this AppProvider will use. */
@@ -14,5 +16,8 @@ public interface AppProvider
 	* It is guaranteed that newMain().getClass() == mainClass()*/
 	public AppMain newMain();
 	
+	/** The classpath from which the main class is loaded, excluding Scala jars.*/
+	public File[] mainClasspath();
+
 	public ComponentProvider components();
 }