Updating expanded tree nodes fails

[ghost]

Attempting to update rows in grid that use 'tree' plugin encounters error if nodes are expanded, when updated. When child node is updated after parent node, tree.js (91) error encountered .

Example below calls store.put on parent object which works fine, but following store.put to child node fails with error in tree.js.

    var data = [
       {id: 0, title: "Item_0", parentId: null, hasChildren: true},
       {id: 1, title: "Item_1", parentId: 0,    hasChildren: false}
    ];

    var store = window.store = Observable(new Store({
            data: data,
            idProperty: "id",
            mayHaveChildren: function(item){
                    return item.hasChildren;
            },
            getChildren: function(item){
                    return store.query({parentId: item.id});
            }
    }));
    window.grid = new OnDemandGrid({
            store: store,
            showHeader: false,
            query: {id: 0},
    columns: {title: tree({ shouldExpand : function () { return true;}, })},
    }, "tree");

    var updater = function(index) {
        data[index].title += "_updated" ;
        store.put(data[index]) ;
    };

    setTimeout (function () {
        try { 
          updater(0) ;
          updater(1) ; // This fails with "Cannot read property 'id' of undefined"
        } catch (err) {
            alert (err.message) ; console.log(err.stack) ;
        }

    }, 5000) 

[ghost]

Issue seems to be in List.js. _When insertRow is called for second put/update, the rowIdToObject[id] value is not set, which cause failure elsewhere. For List.js code extract below, 'row' has a value, but 'beforeNode' has not.

if(!row || // we must create a row if it doesn't exist, or if it previously belonged to a different container
(beforeNode && row.parentNode != beforeNode.parentNode)){
if(row){// if it existed elsewhere in the DOM, we will remove it, so we can recreate it
this.removeRow(row);
}
row = this.renderRow(object, options);
row.className = (row.className || "") + " ui-state-default dgrid-row " + (i % 2 == 1 ? oddClass : evenClass);
// get the row id for easy retrieval
this._rowIdToObject[row.id = id] = object;
}

Without understanding cause of issue, the following code addition seems to prevent problem, Of course better understanding of code is needed, to determine if its a proper resolution.

else if (row && !this._rowIdToObject[id]) {
this._rowIdToObject[row.id] = row;
}