Link re-connection issue during undo / redo

@yscho wrote:

I created an expandable node.
However, there is a problem that link is not reconnected during Undo / Redo operation.

Below are the sources and demos.

Steps to reproduce the problem.
1) [node3] Expanding
2) [node3] Move Down
3) [node3] Delete
4) [Ctrl+Z] three times
5) [Ctrl+Y] two times
6) [node3] Delete
7) [Ctrl+Z] once

Please hint to solve the problem.

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