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function selectClass(){
  $('.f-formstack select, .webform-client-form select').each(function(){
    var t = $(this).parent();
    if (!t.hasClass('has-select')){
      t.addClass('has-select');
    } else{
      clearTimeout(startClass);
    }
  });
}

if ($('.f-formstack, .webform-client-form').length > 0){
  startClass = setTimeout(selectClass(), 100);
}