patch: back up a file before it is removed#91
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Both paths which remove a file did so without a backup, so -b silently preserved nothing. A backup was only ever taken by write_patched_result_to_file, and only for the output path, which is not reached at all when nothing is written. Take the backup on both paths while the file is still there.
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Both paths which remove a file did so without a backup, so -b silently preserved nothing. A backup was only ever taken by write_patched_result_to_file, and only for the output path, which is not reached at all when nothing is written.
Take the backup on both paths while the file is still there.