code: public void repositionPopup() {
          String id = getSelectElt().getId();
          if (!Empty.is(id)) repositionPopup(id);
      }
docs: Should be used for proper popup positioning in case of lazy/delayed population on first click to JQMSelect, like:
  <pre>{@code
  combo.addClickHandler(event -> Scheduler.get().scheduleDeferred(() ->
  fetchAndPopulateOptions(done -> combo.repositionPopup())));
  }</pre>