What makes a batch file rename safe to undo?

<p>An Undo button is useful only if the application still knows what happened to each file—and can explain when going back is no longer possible.</p> <p>I build RenamerX, a desktop file renamer. These are design notes about the boundary between suggesting a filename and changing a real folder. The example below is illustrative, not a benchmark or a report of a customer incident.</p> <h2> Review th

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