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elementui Cascader级联选择器开启可搜索功能

elementui的级联选择器开启可搜索功能之后,我想在输入内容之后不选,接着失去焦点在输入框中保留输入的值,但是组件似乎默认是失去焦点就清空输入框中的值,请问如何保留?
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为啥要保留搜索的值啊,保留的话下次点开还是No matching data


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