| Index: runtime/observatory/lib/src/elements/strongly_reachable_instances.dart
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| diff --git a/runtime/observatory/lib/src/elements/strongly_reachable_instances.dart b/runtime/observatory/lib/src/elements/strongly_reachable_instances.dart
 | 
| index f7538e890ee75884d521c68bdb8173f051ffd21b..c4b85ad83a7cca1a5d2a769e2e0837747f688323 100644
 | 
| --- a/runtime/observatory/lib/src/elements/strongly_reachable_instances.dart
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| +++ b/runtime/observatory/lib/src/elements/strongly_reachable_instances.dart
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| @@ -71,7 +71,7 @@ class StronglyReachableInstancesElement extends HtmlElement
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|    void render() {
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|      children = [
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|        new CurlyBlockElement(expanded: _expanded, queue: _r.queue)
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| -        ..children = _createContent()
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| +        ..content = _createContent()
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|          ..onToggle.listen((e) async {
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|            _expanded = e.control.expanded;
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|            e.control.disabled = true;
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| 
 |