code: @UiHandler("m_searchInput")
      protected void onSearchInputChange(ValueChangeEvent<String> event) {
  
          if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(event.getValue()) && (event.getValue().length() >= 3)) {
              m_tabHandler.setSearchQuery(event.getValue());
          } else {
              m_tabHandler.setSearchQuery(null);
          }
      }
docs: Handles search input change events.<p>
  
  @param event the change event