Fixing change hunk text parsing

This one was caught by quickcheck: parsing hunks encoding binary replacements failed (encoding unknown), whereas the encoding is known in this case, it's base64.

Created by  pmeunier  on January 18, 2026
65EOJOTATWLXGVA7OIZLIQM2NN5DW7OS3LCUXXBRSYX2KBLSBZKAC
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