[TableView] Adding an Item throws a ChangeEvent to the selectedItemProperty

Hello,

after adding an Item to a TableView the ChangeListeners are called two times

Look at this code and the output:

TableView<Integer> tv = new TableView<>();
tv.getItems().add(1);
tv.getSelectionModel().select(0);

tv.getSelectionModel().selectedItemProperty()
.addListener(new ChangeListener<Object>() {
@Override
public void changed(
ObservableValue<? extends Object> observable,
Object oldValue, Object newValue) {
System.out.println("OLDVALUE: " + oldValue
+ " NewValue: " + newValue);
}
});
tv.getItems().add(2);


Output:

OLDVALUE: 1 NewValue: null
OLDVALUE: null NewValue: 1