Ensure that parents for java classes have all the ancestors

Currently, only immediate parents classes are picked up for java classes.
This could be problematic, for example, in detecting Fingerprint for test frameworks.
So far, Scala types are not affected –– all the ancestors are available for them.

compile/api/ClassToAPI.scala

@@ -76,8 +76,17 @@ object ClassToAPI
 	private val lzyEmptyTpeArray = lzy(emptyTypeArray)
 	private val lzyEmptyDefArray = lzy(new Array[xsbti.api.Definition](0))
 
+	private def allSuperclasses(t: Type): Seq[Type] =
+	{
+		def accumulate(t: Type, accum: Seq[Type] = Seq.empty): Seq[Type] = t match {
+			case cl: Class[_] => { val s = cl.getGenericSuperclass ; accumulate(s, accum :+ s) }
+			case _ => accum
+		}
+		accumulate(t)
+	}
+
 	def parents(c: Class[_]): Seq[api.Type] =
-		types(c.getGenericSuperclass +: c.getGenericInterfaces)
+		types(allSuperclasses(c) ++ c.getGenericInterfaces)
 	def types(ts: Seq[Type]): Array[api.Type] = ts filter (_ ne null) map reference toArray;
 	def upperBounds(ts: Array[Type]): api.Type =
 		new api.Structure(lzy(types(ts)), lzyEmptyDefArray, lzyEmptyDefArray)