context: function xtvr_appchild (children){    var idx = this.childData.length;    var delta = 0;    var len = children.length;    for (var i = 0; i <  len; ++i)    {        var child = children[i];        child.isHidden = false;        child.parentRecord = this;        this.childData.push(child);        // this.childData[idx] = child;        //child.childIndex = idx++;        delta += child.visualFootprint;    }        if ("isContainerOpen" in this && this.isContainerOpen)    {        if (this.calculateVisualRow() >= 0)        {            this.resort(true);  /* resort, don't invalidate.  we're going to do                                 * that in the onVisualFootprintChanged call. */        }        this.onVisualFootprintChanged(this.childData[0].calculateVisualRow(),                                      delta);    }}
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