TreeGrid fetchData fires two requests on 3.1d

[markok]

Hello,

For some reason TreeGrid fires multiple rpc requests on fetchData calls. Reproducible with following code.

    private int dummyCriteria = 1;

    public void onModuleLoad() {
        SC.showConsole();

        // our viewport
        viewport = new VLayout();
        viewport.setWidth100();
        viewport.setHeight100();

        // data source with dummy data
        final DataSource ds = new DataSource();
        DataSourceTextField pk = new DataSourceTextField("id");
        pk.setPrimaryKey(true);
        DataSourceTextField text = new DataSourceTextField("text");
        DataSourceTextField parent = new DataSourceTextField("parent");
        parent.setForeignKey("id");
        ds.setFields(pk, text, parent);
        ds.setClientOnly(true);

        ds.setTestData(gr(1, null), gr(2, 1), gr(3, 1), gr(4, 3));

        // our treegrid
        final TreeGrid grid = new TreeGrid();
        grid.setWidth(400);
        grid.setHeight(300);
        grid.setDataSource(ds);
        grid.setAutoFetchData(false);
        grid.setLoadDataOnDemand(false);
        final TreeGridField textField = new TreeGridField("text");
        grid.setFields(textField);
        viewport.addMember(grid);

        // a button to fetch data to the grid
        Button button = new Button("fetch");
        button.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                // fetch with always changing criteria to force server fetch
                grid.fetchData(new Criteria("dummy", "" + dummyCriteria++));
            }
        });

        viewport.addMember(button);
        viewport.draw();
    }

    public Record gr(int i, Integer parent) {
        Record r = new ListGridRecord();
        r.setAttribute("id", "primarykey" + i);
        r.setAttribute("text", "node " + i);
        if(parent != null)
            r.setAttribute("parent", "primarykey" + parent);
        return r;
    }

To reproduce:

1. check Track RPCs in development console RPC pane
2. click the fetch button many times

.. and notice that two rpc requests are always sent on fetch click. Is the code above bad somehow or is this a bug ?

Using 3.1d SNAPSHOT_v8.3d_2012-08-24/LGPL Development Only (built 2012-08-24), firefox 12.0, gwt 2.4.0.

[Isomorphic]

Looks like we had a logic bug in the framework code that you were tripping.
We've made a change to address it. Please try the next nightly build (dated Aug 31 or greater) and let us know if you continue to see this problem.

Regards
Isomorphic Software