Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up dwm-6.3/dwm.c dwm-6.3-attachbottom/dwm.c
|--- dwm-6.3/dwm.c	2022-01-07 12:42:18.000000000 +0100
|+++ dwm-6.3-attachbottom/dwm.c	2022-08-17 22:14:41.813809073 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 147.
Hunk #2 succeeded at 409.
Hunk #3 succeeded at 1076.
Hunk #4 succeeded at 1431.
Hunk #5 succeeded at 1913.
done