fix(runtime-core): fix v-on object kebab-case event emit matching

fix #3527

packages/runtime-core/src/componentEmits.ts

@@ -114,14 +114,15 @@ export function emit(
     }
   }
 
-  // convert handler name to camelCase. See issue #2249
-  let handlerName = toHandlerKey(camelize(event))
-  let handler = props[handlerName]
+  let handlerName
+  let handler =
+    props[(handlerName = toHandlerKey(event))] ||
+    // also try camelCase event handler (#2249)
+    props[(handlerName = toHandlerKey(camelize(event)))]
   // for v-model update:xxx events, also trigger kebab-case equivalent
   // for props passed via kebab-case
   if (!handler && isModelListener) {
-    handlerName = toHandlerKey(hyphenate(event))
-    handler = props[handlerName]
+    handler = props[(handlerName = toHandlerKey(hyphenate(event)))]
   }
 
   if (handler) {