table组件获取选中数据时候，数据格式化时候用了解构复制了一份数据的BUG

[a526672351]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.6.4

Environment

chorme

Reproduction link

ant-design-vue/components/table/util.js

Line 6 in cd467ab

const newItem = { ...item };

Steps to reproduce

table表单勾选数据后，进行了数据编辑，获取勾选数据selectedRows

What is expected?

期望应该selectedRows实时和源data-source保持一致

What is actually happening?

selectedRows数据副本会和修改后数据不一致

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flatArray 使用了 const newItem = { ...item }导致了引用类型拷贝导致，应该修改为const newItem = item 保留地址引用

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