add support for template repeat

lib/src/html_cleaner.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.
 
 /**
  * Part of the template compilation that concerns with simplifying HTML trees to
  * emit trimmed simple HTML code.
  */
 library html_cleaner;
 
@@ skipping 17 matching lines @@
     _component = info;
     super.visitComponentInfo(info);
     _component = oldComponent;
   }
 
   void visitElementInfo(ElementInfo info) {
     var node = info.node;
     info.removeAttributes.forEach(node.attributes.remove);
     info.removeAttributes.clear();
 
-    // Hide all template elements. At the very least, we must do this for
-    // template attributes, such as `<td template if="cond">`.
-    if (info.hasIfCondition && !info.isTemplateElement) {
-      node.attributes['style'] = 'display:none';
+
+    // Normally, <template> nodes hang around in the DOM as placeholders, and
+    // the user-agent style specifies that they are hidden. For browsers without
+    // native template, we inject the style later.
+    //
+    // However, template *attributes* are used for things like this:
+    //   * <td template if="condition">
+    //   * <td template repeat="x in list">
+    //
+    // In this case, we'll leave the TD as a placeholder. So hide it.
+    //
+    // For now, we also support this:
+    //   * <tr template iterate="x in list">
+    //
+    // We don't need to hide this node, because its children are expanded as
+    // child nodes.
+    if (info is TemplateInfo) {
+      TemplateInfo t = info;
+      if (!t.isTemplateElement && (t.hasCondition || t.isRepeat)) {
+        node.attributes['style'] = 'display:none';
+      }
     }
 
     if (info.childrenCreatedInCode) {
       node.nodes.clear();
     }
 
     if (node.tagName == 'style' && node.attributes.containsKey("scoped") &&
         _component != null) {
       // Remove the style tag we've parsed the CSS.
       node.remove();
     }
 
     super.visitElementInfo(info);
   }
 }