Unit tests for scala#73 passing

src/main/scala/scala/xml/Utility.scala

@@ -46,17 +46,28 @@ object Utility extends AnyRef with parsing.TokenTests {
    */
   def trim(x: Node): Node = x match {
     case Elem(pre, lab, md, scp, child@_*) =>
-      val children = child flatMap trimProper
+      val children = combineAdjacentTextNodes(child:_*) flatMap trimProper
       Elem(pre, lab, md, scp, children.isEmpty, children: _*)
   }
 
+  private def combineAdjacentTextNodes(children: Node*): Seq[Node] = {
+    children.foldLeft(Seq.empty[Node]) { (acc, n) =>
+      (acc.lastOption, n) match {
+        case (Some(Text(l)), Text(r)) => {
+          acc.dropRight(1) :+ Text(l + r)
+        }
+        case _ => acc :+ n
+      }
+    }
+  }
+
   /**
    * trim a child of an element. `Attribute` values and `Atom` nodes that
    *  are not `Text` nodes are unaffected.
    */
   def trimProper(x: Node): Seq[Node] = x match {
     case Elem(pre, lab, md, scp, child@_*) =>
-      val children = child flatMap trimProper
+      val children = combineAdjacentTextNodes(child:_*) flatMap trimProper
       Elem(pre, lab, md, scp, children.isEmpty, children: _*)
     case Text(s) =>
       new TextBuffer().append(s).toText