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Fix Item#isChild(item).
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@ -643,7 +643,7 @@ var Item = this.Item = Base.extend({
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* @return {boolean} {@true it is a child of the item}
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* @return {boolean} {@true it is a child of the item}
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*/
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*/
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isChild: function(item) {
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isChild: function(item) {
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return item._parent == this;
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return item && item._parent == this;
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},
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},
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/**
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/**
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