fix: fix parsing chained modifiers

Author: yyx990803

src/walk.ts

@@ -121,11 +121,10 @@ const processDirective = (
   let modifiers: Record<string, true> | undefined
 
   // modifiers
-  let modMatch: RegExpExecArray | null = null
-  while ((modMatch = modifierRE.exec(raw))) {
-    ;(modifiers || (modifiers = {}))[modMatch[1]] = true
-    raw = raw.slice(0, modMatch.index)
-  }
+  raw = raw.replace(modifierRE, (_, m) => {
+    ;(modifiers || (modifiers = {}))[m] = true
+    return ''
+  })
 
   if (raw[0] === ':') {
     dir = bind

tests/on.html

@@ -11,7 +11,7 @@
     placeholder="type x to test key modifier"
   />
   <form>
-    <button type="submit" @click.prevent>submit (prevented)</button>
+    <button type="submit" @click.prevent.stop>submit (prevented)</button>
   </form>
   <button @click.right="alert('clicked')">right click</button>
   <button @click.middle="alert('clicked')">middle click</button>