Enhanced Selection doesn't work with GridLazyDataView

[deyaeddin]

when using Enhanced Selection with Lazy Data Provider, this exception is thrown.

java.lang.IllegalStateException: GridListDataView only supports 'ListDataProvider' or it's subclasses, but was given a 'AbstractBackEndDataProvider'. Use either 'getLazyDataView()', 'getListDataView()' or 'getGenericDataView()' according to the used data type. at com.vaadin.flow.data.provider.AbstractDataView.verifyDataProviderType(AbstractDataView.java:114) at com.vaadin.flow.data.provider.AbstractDataView.<init>(AbstractDataView.java:74)

[javier-godoy]

As mentioned in #110 (comment), the current implementation iof this feature is intentionally restricted to in-memory data providers, because there is no efficient way to compute indexOf from a backend data provider. https://github.com/vaadin-component-factory/selection-grid-flow follows a different approach by capturing the indexes in the client-side, so that the data provider can resolve them.