A ListCell which can be used to unselect

UnselectListCell.java

private class UnselectListCell<T> extends ListCell<T> {
    public UnselectListCell() {
       
        addEventFilter(MouseEvent.MOUSE_PRESSED, event -> {
            if (!isEmpty()) {
                MultipleSelectionModel<T> selectionModel = getListView().getSelectionModel();
                int index = getIndex();
                if (selectionModel.getSelectedIndices().contains(index)) {
                    selectionModel.clearSelection(index);
                } else {
                    selectionModel.select(index);
                }
                event.consume();
            }
        });
    }
}