Fixed #1390 - Dropdown onkeydown item search not working properly

src/components/dropdown/Dropdown.vue

@@ -534,7 +534,7 @@ export default {
                 clearTimeout(this.searchTimeout);
             }
 
-            const char = String.fromCharCode(event.keyCode);
+            const char = event.key;
             this.previousSearchChar = this.currentSearchChar;
             this.currentSearchChar = char;