code: public function getFilteredRequestListUrl($filters = array())
      {
          // Preserver current filter
          $currentFilters = Mage::helper('sheep_debug/filter')->getRequestFilters($this->getRequest());
          $filters = array_merge($currentFilters, $filters);
  
          return $this->getRequestListUrl($filters);
      }
docs: Returns url for request list with current filters
  
  @param array $filters
  @return string