Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 10dd5df95f551d81d0a814dcdb2bde20e405fb91 Mon Sep 17 00:00:00 2001
|From: sympodius <mail@sympodius.net>
|Date: Mon, 13 Mar 2023 16:28:16 +0000
|Subject: [PATCH] [dwm][patch][clientopacity] Adds opacity on a per client
| basis
|
|---
| config.def.h | 80 ++++++++++++++++++++++++++++------------------------
| dwm.c        | 61 ++++++++++++++++++++++++++++++++++++++-
| 2 files changed, 103 insertions(+), 38 deletions(-)
|
|diff --git a/config.def.h b/config.def.h
|index 9efa774..9ca812d 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 5.
Hunk #2 succeeded at 28.
Hunk #3 succeeded at 62 (offset -1 lines).
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 c2bd871..71cf33c 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 62.
Hunk #2 succeeded at 95.
Hunk #3 succeeded at 140.
Hunk #4 succeeded at 153.
Hunk #5 succeeded at 191.
Hunk #6 succeeded at 295 (offset 1 line).
Hunk #7 succeeded at 309 (offset 1 line).
Hunk #8 succeeded at 469 (offset 1 line).
Hunk #9 succeeded at 845 (offset 1 line).
Hunk #10 succeeded at 1085 (offset -10 lines).
Hunk #11 succeeded at 1254 (offset 1 line).
Hunk #12 succeeded at 1618 (offset -17 lines).
Hunk #13 succeeded at 1824 (offset 7 lines).
Hmm...  Ignoring the trailing garbage.
done