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这种情况下预期与得到不符。代码链接如下:
https://codesandbox.io/s/patchchildren-keyed-double-end-add2-forked-fmecu?file=/src/index.js
未被处理的全新节点不应该插入到oldStartIdx索引所指向的节点之前,而是应该插入到newEndIdx + 1索引所指向的节点之前。修改后可得到预期效果。