code: public function getMultiline()
      {
          if (is_null($this->_multiline)) {
              $this->_multiline = MultilineDetector::test($this->fieldSchema);
          }
  
          return $this->_multiline;
      }
docs: Get multiline.
  
  @return [[@doctodo return_type:getMultiline]] [[@doctodo return_description:getMultiline]]