Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From db6a8931a55982b95ed24ef57c8b71a6a3dafab6 Mon Sep 17 00:00:00 2001
|From: Jack Bird <jack.bird@durham.ac.uk>
|Date: Wed, 4 Aug 2021 20:27:23 +0100
|Subject: [PATCH] Focus master and return supported over all tags
|
|---
| dwm.c | 39 +++++++++++++++++++++++++++++++++++++++
| 1 file changed, 39 insertions(+)
|
|diff --git a/dwm.c b/dwm.c
|index 5e4d494..ee28f28 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 127.
Hunk #2 succeeded at 168.
Hunk #3 succeeded at 662.
Hunk #4 succeeded at 822.
Hunk #5 succeeded at 1237.
Hmm...  Ignoring the trailing garbage.
done