placeholder设置响应式数据，视图上不变化

[iaa3906]

Describe the bug

我把placeholder当做属性传进来，子组件中我用watch监听打印出来确实变化了，但是视图上却没变化， <code-mirror v-model:value="code" :options="options" :placeholder="placeholder" :height="300" @change="onChange" /> const props = defineProps({ code: { default: '', type: String }, placeholder: { default: '', type: String } }) const code = toRef(props, 'code') const placeholder = toRef(props, 'placeholder') watch(placeholder, function (newVal, oldVal) { console.log(newVal, oldVal) }) 我改成直接用响应式数据不用props，也不行

Validations

• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[rennzhang]

fixed https://github.com/RennCheung/codemirror-editor-vue3/blob/main/CHANGELOG.md