MaterialListValueBox.setVisibleItemCount doesn't affect the actual count of visible items

[chamgda]

MaterialListValueBox.setVisibleItemCount simply calls GWT ListBox.setVisibleItemCount which sets the size attribute on the wrapped select element. Said select element is not visible though and the visible ul element is not affected at all. This is not what MaterialListValueBox.setVisibleItemCount advertises in its JavaDoc.

[kevzlou7979]

Will revalidate this and will patch on GMD 2.3