InsertAfterEvent、InsertBeforeEvent、AppendNodeEvent事件 #4278
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wangchenyi1996
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InsertAfterEvent： 节点后插入
InsertBeforeEvent：节点前插入
AppendNodeEvent： 追加子节点
这几个事件正常的拖拽新增没有问题， 如果是上下拖动也会触发这2个事件InsertAfterEvent、InsertBeforeEvent，
如何区分到底是新增还是上下拖动呢。下方图可能更清楚些
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