Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Author: Chris Noxz <chris@noxz.tech>
|
|diff -up ../dwm-6.5/dwm.c ./dwm.c
|--- ../dwm-6.5/dwm.c	2024-03-19 12:24:52.000000000 +0100
|+++ ./dwm.c	2024-06-21 14:06:47.127064311 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 1301.
Hunk #2 succeeded at 1318.
Hunk #3 succeeded at 1343.
Hunk #4 succeeded at 1361.
done