Voted for. It's possible to use the audit trail to determine what occurred and 'undo' the changes, but that's not as simply as an undo tool. I agree with @Mark Farnell, the ability to toggle auto-save on/off might be useful. When building longer flows, particularly those with repetitive steps, it's tedious waiting for auto-save to catch-up. Even worse when it doesn't and you have to start again.
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