Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- a/dwm.c	2025-07-14 22:37:49.738597862 +0800
|+++ b/dwm.c	2025-07-14 22:37:08.706035689 +0800
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 1846 (offset -18 lines).
Hunk #2 succeeded at 1872 (offset -18 lines).
done