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[Effen] fix _ensureDepth to work on root of tree, oops

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R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1050153002
This commit is contained in:
Hixie 2015-04-01 12:08:06 -07:00
parent 6ff2cfbe82
commit ee63773cd1
1 changed files with 6 additions and 2 deletions
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8
framework/fn.dart
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@ -94,8 +94,12 @@ abstract class UINode {
int _nodeDepth;
void _ensureDepth() {
if (_nodeDepth == null) {
_parent.ensureDepth();
_nodeDepth = _parent._nodeDepth + 1;
if (_parent != null) {
_parent.ensureDepth();
_nodeDepth = _parent._nodeDepth + 1;
} else {
_nodeDepth = 0;
}
}
}