fix: edit tool error after undo #4923
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Prevents unnecessary read/write cycles when editing files after undo / redo.
From
edit -> error "modified externally" -> read -> edit(extra read and edit in context + extra time) to justedit.revert()andunrevert()so the edit tool sees them as freshly read rather than externally modified*Restoring the old read time would be more semantically correct but adds complexity without functional benefit.