Fixed remove/clear/update issues in BufferWrapper and layout map.

git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@19374 5e8d7ff9-d8ef-0310-90f0-a4852d11357a

src/swing/scala/swing/BufferWrapper.scala

@@ -18,9 +18,9 @@ import scala.collection.IndexedSeq
  * Default partial implementation for buffer adapters.
  */
 protected[swing] abstract class BufferWrapper[A] extends Buffer[A] { outer =>
-  def clear() { for (i <- 0 until length) remove(i) }
+  def clear() { for (i <- 0 until length) remove(0) }
   def update(n: Int, a: A) {
-    remove(0)
+    remove(n)
     insertAt(n, a)
   }
   def insertAll(n: Int, elems: scala.collection.Traversable[A]) {

src/swing/scala/swing/LayoutContainer.scala

@@ -67,8 +67,8 @@ trait LayoutContainer extends Container.Wrapper {
     def get(c: Component) = Swing.toOption(constraintsFor(c))
     override def size = peer.getComponentCount
     def iterator: Iterator[(Component, Constraints)] = 
-      Iterator.range(0,size).map { c => 
-        val comp = UIElement.cachedWrapper[Component](peer.getComponent(c).asInstanceOf[JComponent])
+      peer.getComponents.iterator.map { c => 
+        val comp = UIElement.cachedWrapper[Component](c.asInstanceOf[JComponent])
         (comp, constraintsFor(comp))
       }
   }