Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 30a04d9ecb3998953bdbe42e5617d00d6002869b Mon Sep 17 00:00:00 2001
|From: Santtu Lakkala <inz@inz.fi>
|Date: Wed, 16 Feb 2022 20:34:20 +0200
|Subject: [PATCH] Loop through urls on screen and copy to clipboard
|
|Replace url detection heuristics with a DFA, enabling urls that span
|multiple lines. Also fix the selection not to use snapping so that urls
|are selected exactly.
|---
| config.def.h |  1 +
| st.c         | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++
| st.h         |  1 +
| 3 files changed, 95 insertions(+)
|
|diff --git a/config.def.h b/config.def.h
|index 91ab8ca..3f365c7 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 201.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/st.c b/st.c
|index 51049ba..5b6d919 100644
|--- a/st.c
|+++ b/st.c
--------------------------
Patching file st.c using Plan A...
Hunk #1 succeeded at 152.
Hunk #2 succeeded at 205.
Hunk #3 succeeded at 2694.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/st.h b/st.h
|index 519b9bd..0458005 100644
|--- a/st.h
|+++ b/st.h
--------------------------
Patching file st.h using Plan A...
Hunk #1 succeeded at 85.
Hmm...  Ignoring the trailing garbage.
done