UndoManager: 取消 Y.Map#set 组合并从父 Y.Array 中删除该 Y.Map 会导致 1 个客户端拥有无效的 Y.Map

Describe the bug When undoing the combination of map set operation together with an operation that deletes that map from its parent array and then synchronizing, the result is that the other client ends up in a bad and different state than the client that did the undo.