context:     popNode: function(node) {        var p = node.parent;        // Update the parent's collection of children        var a = [];        for (var i=0, len=p.children.length;i<len;++i) {            if (p.children[i] != node) {                a[a.length] = p.children[i];            }        }        p.children = a;        // reset the childrenRendered flag for the parent        p.childrenRendered = false;         // Update the sibling relationship        if (node.previousSibling) {            node.previousSibling.nextSibling = node.nextSibling;        }        if (node.nextSibling) {            node.nextSibling.previousSibling = node.previousSibling;        }        node.parent = null;        node.previousSibling = null;        node.nextSibling = null;        node.tree = null;        // Update the tree's node collection        delete this._nodes[node.index];    },
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