Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

In `pijul git`, avoid diffing files not modified by a commit

Created by  pmeunier  on October 18, 2022
FF4TXHN5T4QFIUI4MNCWZYNV6D5F5K5JKPBESN3EPP5YHLHSYI5AC
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