Javascript error when SuperLongFIeld is used in a customfield

[jcgueriaud1]

There is an issue when the SuperLongField is validated and it's used in a customfield:
checkValidity is undefined

Here is a demo page to reproduce it:

@Route(value = "test")
@PageTitle("SuperFields - Demo App")
public class TestPage extends VerticalLayout {

    public TestPage() {
        add(new CustomSuperLongField());
    }


    public static class CustomSuperLongField extends CustomField<Long> {

        private SuperLongField longField;

        public CustomSuperLongField() {
            add(longField = new SuperLongField());
        }

        @Override
        protected Long generateModelValue() {
            return longField.getValue();
        }

        @Override
        protected void setPresentationValue(Long value) {
            longField.setValue(value);
        }
    }
}

Then enter something in the field and blur it, you should have a javascript error.