Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 20967685d6879bd611a856ade154df19da9ddc7b Mon Sep 17 00:00:00 2001
|From: Stein Gunnar Bakkeby <bakkeby@gmail.com>
|Date: Wed, 8 May 2019 08:07:14 +0200
|Subject: [PATCH] Vanity gaps - allows control of both inner and outer gaps
| between windows and screen edge
|
|---
| config.def.h |  21 +++++++++
| dwm.c        | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
| 2 files changed, 161 insertions(+), 10 deletions(-)
|
|diff --git a/config.def.h b/config.def.h
|index 1c0b587..0927c2d 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 3.
Hunk #2 succeeded at 75.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/dwm.c b/dwm.c
|index 4465af1..88f3e04 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 119.
Hunk #2 succeeded at 203.
Hunk #3 succeeded at 254.
Hunk #4 succeeded at 653.
Hunk #5 succeeded at 1517.
Hunk #6 succeeded at 1797.
Hmm...  Ignoring the trailing garbage.
done