Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff '--color=auto' -up dwm-6.3/config.def.h windowfollow-impl-6-3/config.def.h
|--- dwm-6.3/config.def.h	2022-01-07 11:42:18.000000000 +0000
|+++ windowfollow-impl-6-3/config.def.h	2022-10-02 18:32:22.244267491 +0100
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 31.
Hunk #2 succeeded at 70.
Hunk #3 succeeded at 109.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff '--color=auto' -up dwm-6.3/dwm.1 windowfollow-impl-6-3/dwm.1
|--- dwm-6.3/dwm.1	2022-01-07 11:42:18.000000000 +0000
|+++ windowfollow-impl-6-3/dwm.1	2022-10-02 18:32:22.244267491 +0100
--------------------------
Patching file dwm.1 using Plan A...
Hunk #1 succeeded at 44.
Hunk #2 succeeded at 81.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff '--color=auto' -up dwm-6.3/dwm.c windowfollow-impl-6-3/dwm.c
|--- dwm-6.3/dwm.c	2022-01-07 11:42:18.000000000 +0000
|+++ windowfollow-impl-6-3/dwm.c	2022-10-02 18:32:22.244267491 +0100
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 65.
Hunk #2 succeeded at 113.
Hunk #3 succeeded at 213.
Hunk #4 succeeded at 442.
Hunk #5 succeeded at 646.
Hunk #6 succeeded at 738.
Hunk #7 succeeded at 1673.
Hunk #8 succeeded at 1683.
Hunk #9 succeeded at 1725.
done