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AI-generatedNano WriteOut retries duplicate file contents when Append or Prepend is enabled
When a save fails in GNU nano, the edit buffer remains unchanged and the user can retry the WriteOut (^O) command. The goal is to guarantee that a successful retry does not duplicate the buffer's contents in the target file. By default nano overwrites the file, but if the Append or Prepend toggle (Meta-A / Meta-P) is enabled, each retry adds the buffer again
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