Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -pu dwm.git/config.def.h dwm.underlinetags/config.def.h
|--- dwm.git/config.def.h	2021-02-27 20:04:32.030570909 -0600
|+++ dwm.underlinetags/config.def.h	2021-03-16 16:42:26.278703624 -0500
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 21.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -pu dwm.git/dwm.c dwm.underlinetags/dwm.c
|--- dwm.git/dwm.c	2021-02-27 20:04:32.030570909 -0600
|+++ dwm.underlinetags/dwm.c	2021-03-16 16:41:21.468077151 -0500
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 718 (offset -1 lines).
done