Implementing Custom SingleSelectionModel

So I have a custom SingleSelectionModel which I am using to catch the setSelection well before it is selected. Basically to Cancel selection of second cell if the form data of the first cell is not saved. 

public class PromptingSelectionModel<T> extends SingleSelectionModel<T> {

    private boolean stopSelection;

    public PromptingSelectionModel() {

        super();

    }

    public PromptingSelectionModel(ProvidesKey<T> keyProvider) {

        super(keyProvider);

    }

    @Override

    public void setSelected(T object, boolean selected) {

        if (formChanged

                && !Window.confirm("There are unsaved changes, are you sure you want to continue?")) {

            stopSelection = true;

            return;

        } else {

            stopSelection = false;

        }

        if (!(stopSelection)) {

            super.setSelected(object, selected);

          }

    }

 The problem I see here is When I move from one Cell item to another the setSelected method here is sometimes called twice and sometimes it is called once. 

Cell 1 selected. Which shows form data. I changed form data. formChanged get set to True. 

Clicked on Cell 3. setSelected method of PromptingSelectionModel is called. I see parameters to the methods are coming as DTO of Cell 1 and false. I get the confirm dialog box. I clicked Cancel. setSelected method of PromptingSelectionModel is called again. I see parameters to the methods are coming as DTO of Cell 2 and true.  I get the confirm dialog box again. Clicking Cancel now will keep the selection of Cell 1. So I got two confirm here okay? Then I click Cell 5. setSelected method of PromptingSelectionModel is called. I see parameters to the methods are coming as DTO of Cell 5 and true.I get the confirm dialog box only once. Clicking Cancel now will keep the selection of Cell 1.

Is this a know bug? It seems internally hasCellPresenter class is called or something which sets the second cell as true. 

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