setValue does not clear the previous value but only add items

[jcgueriaud1]

When I call setValue the old value is kept and concatenated, instead of being set like it should. Is it intended?

For example if you have an entity bound and run setBean it will keep the old values.

Here is an example to reproduce the issue:

@PageTitle("Twin Col Grid")
@Route(value = "twincol", layout = MainLayout.class)
public class TwinColGridView extends VerticalLayout {

    private Button button;
    private TwinColGrid<String> twinColGrid = new TwinColGrid<>("TwinCol");

    private List<String> items = new ArrayList<>();

    public TwinColGridView() {
        for (int i = 0; i < 10; i++) {
            items.add("Item "+ i);
        }
        twinColGrid.addColumn(item -> item, "item");
        twinColGrid.setItems(items.stream());
        twinColGrid.setSizeFull();
        button = new Button("set Value");
        button.addClickListener(e -> {
            twinColGrid.setValue(Collections.singleton(items.stream().findFirst().get()));
        });

        add(twinColGrid, button);
        setSizeFull();
    }

}

[javier-godoy]

When I call setValue the old value is kept and concatenated, instead of being set like it should. Is it intended?

It's not intended. It breaks the contract of setValue.

[javier-godoy]

Fix released in version 2.7.1