Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 70a21457fdbcbcdf26efb1329dd29872b7fcd8e3 Mon Sep 17 00:00:00 2001
|From: ysl2 <www.songli.yu@gmail.com>
|Date: Sun, 29 Oct 2023 15:45:05 +0800
|Subject: [PATCH] Give killclient an augument to control the beheviour: arg.ui
| == 0 for normal kill current client; arg.ui == 1 for kill other clients in
| current tag (except current focusing client); arg.ui == 2 for kill all
| clients in current tag (include focusing client).
|
|---
| config.def.h |  2 ++
| dwm.c        | 30 ++++++++++++++++++++++++------
| 2 files changed, 26 insertions(+), 6 deletions(-)
|
|diff --git a/config.def.h b/config.def.h
|index 9efa774..d39e6dd 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 74.
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 f1d86b2..011744d 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 177.
Hunk #2 succeeded at 1014.
Hmm...  Ignoring the trailing garbage.
done