Fix position of error messages.

dart/site/try/src/interaction_manager.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library trydart.interaction_manager;
 
 import 'dart:html';
 
 import 'dart:convert' show
     JSON;
@@ skipping 855 matching lines @@
 // Otherwise return [node].
 Node findLine(Node node) {
   for (Node n = node; n != null; n = n.parent) {
     if (n is Element && n.classes.contains('lineNumber')) return n;
     if (n == mainEditorPane) return n;
   }
   return node;
 }
 
 Element makeLine(List<Node> lineNodes, String state) {
-  // Using a div element here (anything with display=block) generally messes up
-  // editing and navigation.  We would like to use a block element here so
-  // error messages show as expected.  But no such luck.  Fortunately, there
-  // are strong indications that the current solution for displaying errors
-  // isn't good enough anyways.
   return new SpanElement()
       ..setAttribute('dart-state', state)
       ..nodes.addAll(lineNodes)
       ..classes.add('lineNumber');
 }
 
 bool isAtEndOfFile(Text text, int offset) {
   Node line = findLine(text);
   return
       line.nextNode == null &&
       text.parent.nextNode == null &&
       offset == text.length;
 }
 
 List<String> splitLines(String text) {
   return text.split(new RegExp('^', multiLine: true));
 }