Added a filter to sort categories by position by default

Author: dnyomo

app/code/Magento/CatalogGraphQl/Model/Category/CategoryFilter.php

@@ -13,6 +13,7 @@
 use Magento\Framework\Exception\InputException;
 use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\Resolver\Argument\SearchCriteria\ArgumentApplier\Filter;
+use Magento\Framework\GraphQl\Query\Resolver\Argument\SearchCriteria\ArgumentApplier\Sort;
 use Magento\Search\Model\Query;
 use Magento\Store\Api\Data\StoreInterface;
 use Magento\Store\Model\ScopeInterface;
@@ -71,6 +72,7 @@ public function getResult(array $criteria, StoreInterface $store)
         $categoryIds = [];
         $criteria[Filter::ARGUMENT_NAME] = $this->formatMatchFilters($criteria['filters'], $store);
         $criteria[Filter::ARGUMENT_NAME][CategoryInterface::KEY_IS_ACTIVE] = ['eq' => 1];
+        $criteria[Sort::ARGUMENT_NAME][CategoryInterface::KEY_POSITION] = ['ASC'];
         $searchCriteria = $this->searchCriteriaBuilder->build('categoryList', $criteria);
         $pageSize = $criteria['pageSize'] ?? 20;
         $currentPage = $criteria['currentPage'] ?? 1;