[mdv] Avoid observing placeholder arrays in TemplateIterator

pkg/mdv/lib/src/input_bindings.dart

Index: pkg/mdv/lib/src/input_bindings.dart
diff --git a/pkg/mdv/lib/src/input_bindings.dart b/pkg/mdv/lib/src/input_bindings.dart
index 167fd763bc00d4fa47864ac3f33b81be081aaa0b..41fdbb95bb79c2b045b73eaf36f7c907cff336c4 100644
--- a/pkg/mdv/lib/src/input_bindings.dart
+++ b/pkg/mdv/lib/src/input_bindings.dart
@@ -157,12 +157,11 @@ class _SelectedIndexBinding extends _InputBinding {
     // Instead we use runAsync. Each <template repeat> needs a delay of 3:

[justinfagnani, 2013/07/24 00:42:55]

3 -> 2?

[Jennifer Messerly, 2013/07/24 00:52:58]

Done.

     //   * once to happen after the child _TemplateIterator is created
     //   * once to be after _TemplateIterator.inputs CompoundBinding resolve
-    //   * once to be after _TemplateIterator._valueBinding PathObserver fires
     // And then we need to do this delay sequence twice:
     //   * once for OPTGROUP
     //   * once for OPTION.
-    // The resulting 2 * 3 is our maxRetries.
-    var maxRetries = 6;
+    // The resulting 2 * 2 is our maxRetries.
+    var maxRetries = 4;
     delaySetSelectedIndex() {
       if (newValue > element.length && --maxRetries >= 0) {
         runAsync(delaySetSelectedIndex);