MultiSelectListBox items get deselected after a filter is added to the data provider

[javier-godoy]

As discussed here, MultiSelectListBox presents the same behavior that was reported for Select in https://github.com/vaadin/vaadin-select/issues/239

The snippet from the forum reproduces the issue in Vaadin 14.4.2:

MultiSelectListBox<String> stringMultiSelectListBox = new MultiSelectListBox<>();
stringMultiSelectListBox.setItems(Arrays.asList("1", "2", "3", "4", "5"));
stringMultiSelectListBox.select("5");
((ListDataProvider<String>)stringMultiSelectListBox.getDataProvider()).setFilter(s -> s.equals("5"));
add(stringMultiSelectListBox);