Select 选择器 多选搜索框（使用nzKeepUnListOptions属性的情况下）数据重复BUG

[ferqx]

1. 版本：自0.5.0-rc.0以来就一直存在，在此十分抱歉没有及时的反馈

2. 代码地址：https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/src/components/select/nz-select.component.ts

3. 重现步骤：

使用nz-select组件添加nzKeepUnListOptions属性时，并存在默认数据的情况下，如以下情况：

这时我再次输入与默认数据相关的文字时

并回车

这时搜索相关的数据时数据再次出现，并增加相同数据

4. 原因：

在执行 updateSelectedOption 方法时，该红框内的 Set 对象 has 方法无法正确的过滤对象进行判断

5. 个人解决方案:

[ng-zorro-bot]

Hello @ferqx, your issue has been closed because it does not conform to our issue requirements. Please use the Issue Helper to create an issue, thank you!

[ng-zorro-bot]

It will be better to write your issue/comment in English, so more people can understand you.
And this means that more people can help you or benefit from your issue/comment.

[vthinkxie]

thanks for your feedback, will be fixed in next version.

[lock]

This thread has been automatically locked because it has not had recent activity. Please open a new issue for related bugs and link to relevant comments in this thread.