🐛 [Bug]: Mention 组件自定义前缀不支持 大于1长度的字符

[Muluk-m]

Version

latest

Angular Version

lastest

Link to minimal reproduction

https://devui.design/components/zh-cn/mention/demo#custom-prefix

Step to reproduce

1. 配置prefixes = ['$$']
2. 输入 $$

What is expected

期望能够触发提示信息

What is actually happening

未触发提示信息

Any additional comments (optional)

No response

[Muluk-m]

再补充一点，在内容中间触发prefix关键字，选中提示信息后,会将prefix关键字之后的内容清空