Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up dwm-6.2/dwm.c dwm-6.2-attachbottom/dwm.c
|--- dwm-6.2/dwm.c	2019-02-02 13:55:28.000000000 +0100
|+++ dwm-6.2-attachbottom/dwm.c	2020-12-27 10:43:35.956867775 +0100
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 147.
Hunk #2 succeeded at 408.
Hunk #3 succeeded at 1072.
Hunk #4 succeeded at 1427.
Hunk #5 succeeded at 1907.
done