Allow resolving links that contain inline syntax.

lib/src/html_renderer.dart

 // Copyright (c) 2012, 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 markdown.html_renderer;
 
 import 'ast.dart';
 import 'document.dart';
 import 'inline_parser.dart';
 
@@ skipping 42 matching lines @@
 
   bool visitElementBefore(Element element) {
     // Hackish. Separate block-level elements with newlines.
     if (!buffer.isEmpty && _BLOCK_TAGS.firstMatch(element.tag) != null) {
       buffer.write('\n');
     }
 
     buffer.write('<${element.tag}');
 
     // Sort the keys so that we generate stable output.
-    // TODO(rnystrom): This assumes keys returns a fresh mutable
-    // collection.
     final attributeNames = element.attributes.keys.toList();
     attributeNames.sort((a, b) => a.compareTo(b));
     for (final name in attributeNames) {
       buffer.write(' $name="${element.attributes[name]}"');
     }
 
     if (element.isEmpty) {
       // Empty element like <hr/>.
       buffer.write(' />');
       return false;
     } else {
       buffer.write('>');
       return true;
     }
   }
 
   void visitElementAfter(Element element) {
     buffer.write('</${element.tag}>');
   }
 }