/**
  * Gets the relevant style rules from a media rule
  *
  * @param  \Crossjoin\Css\Format\Rule\AtMedia\MediaRule  $rule
  * @param  array                                         &$collection
  * @return void
  */
 protected function getRelevantMediaRule(MediaRule $rule, &$collection)
 {
     foreach ($rule->getQueries() as $media_query) {
         if (!$this->isAllowedMediaRule($media_query)) {
             continue;
         }
         foreach ($this->getRelevantStyleRules($rule->getRules()) as $style_rule) {
             $collection[] = $style_rule;
         }
         break;
     }
 }