Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From: 3o14r473 <3o14@pm.me> E4FE E61C 3B02 F4CA B6D8  0CA7 F105 757D 34BE FA98
|Donate: monero:41rMoMLvk8hEJYP2vbv3dNUGzN95CLXoANAtmAVaUxzse5KfPjhkE7d4PUwh8kCkF16FwwqfZTmS4ZKmYCjrsFAcGXTPpwH
|Subject: [PATCH] dwm-qubesrules-6.3.diff 
|
|This patch allows dwm to use QubesOS-specific
|window properties, _QUBES_LABEL and _QUBES_VMNAME, in its rulematching.
|
|It needs to be applied on top of the qubesdecorations patch.
|---
| config.def.h | 8 +++++---
| dwm.c        | 6 ++++++
| 2 files changed, 11 insertions(+), 3 deletions(-)
|
|diff --git a/config.def.h b/config.def.h
|index 42dce05..b246392 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 23 (offset -17 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 be99dde..9a71902 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 failed at 86.
Hunk #2 succeeded at 134 (offset -2 lines).
Hunk #3 succeeded at 300 (offset -4 lines).
Hunk #4 succeeded at 1049 (offset -32 lines).
1 out of 4 hunks failed
Hmm...  Ignoring the trailing garbage.
done