[5.x] Avoid updating Bard value unless content has actually changed (#13645)

Author: duncanmcclean

resources/js/components/fieldtypes/bard/BardFieldtype.vue

@@ -411,7 +411,7 @@ export default {
         json(json, oldJson) {
             if (!this.mounted) return;
                         
-            if (json === oldJson) return;
+            if (JSON.stringify(json) === JSON.stringify(oldJson)) return;
 
             this.updateDebounced(json);
         },