application not responsive after undo

[CShuwen]

The app is stuck after calling undo. Causing inconvenience to the user. (after editing the json file)

[soc-se-bot]

Team's Response

I wonder what is the reason that causes this.

Items for the Tester to Verify

:question: Issue response

Team chose [response.CannotReproduce]

• [x] I disagree

Reason for disagreement: I have encountered ''not responding" but I could not really reproduce it. I still believe this is abnormal

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