Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 35ae18e5c351739b2d80acd0d77db7856caf2596 Mon Sep 17 00:00:00 2001
|From: Coral Pink <coral.pink@disr.it>
|Date: Fri, 26 Dec 2025 00:11:31 +0100
|Subject: [PATCH] highlight & loop through urls in both directions
|
|Based on a previous patch (st-copyurl-20230406-211964d.diff).
|This patch fixes two bugs when looping forward:
|1. URLs on the same line iterated the same way as when looping backward
|   (right-to-left). Now it's left-to-right.
|2. When an URL in the first row was selected, looping forward didn't
|   work, it just got stuck there.
|
|Co-authored-by: Gildasio Junior <gildasiojunior@riseup.net>
|---
| config.def.h |   2 +
| st.c         | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++
| st.h         |   1 +
| 3 files changed, 130 insertions(+)
|
|diff --git a/config.def.h b/config.def.h
|index 2cd740a..f2d8d77 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 8e57991..10dd9d5 100644
|--- a/st.c
|+++ b/st.c
--------------------------
Patching file st.c using Plan A...
Hunk #1 succeeded at 201.
Hunk #2 succeeded at 2701.
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 fd3b0d8..baa8f29 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