Sanitized filters with strtolower as the attribute map construction a…

…pplies a strtolower

app/code/local/Emico/AttributeLanding/Model/Tweakwise/UrlStrategy/AttributeLandingStrategy.php

@@ -142,9 +142,15 @@ protected function buildFilterHash(array $filters, int $categoryId = null)
             return null;
         }
 
+        foreach ($filters as $key => $filterValues) {
+            $sanitizedFilters = array_map('strtolower', $filterValues);
+            $filters[$key] = $sanitizedFilters;
+        }
+
         if ($categoryId !== null && !$this->isRootCategory($categoryId)) {
             $filters['category'] = $categoryId;
         }
+
         ksort($filters);
         return md5(json_encode($filters));
     }
@@ -231,4 +237,4 @@ public function buildCanonicalUrl(Emico_Tweakwise_Model_Catalog_Layer $state)
     {
         return $this->buildUrl($state);
     }
-}
+}