public function getForm(array &$original_form, FormStateInterface $form_state, array $additional_widget_parameters) {
$form = parent::getForm($original_form, $form_state, $additional_widget_parameters);
$field_cardinality = $form_state->get(['entity_browser', 'validators', 'cardinality', 'cardinality']);
public function getForm(array &$original_form, FormStateInterface $form_state, array $additional_widget_parameters) {
$form = parent::getForm($original_form, $form_state, $additional_widget_parameters);
$field_cardinality = $form_state->get(['entity_browser', 'validators', 'cardinality', 'cardinality']);