Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 69cffc587b54b0a9cd81adb87abad8e526d5b25b Mon Sep 17 00:00:00 2001
|From: "Avi Halachmi (:avih)" <avihpit@yahoo.com>
|Date: Thu, 4 Jun 2020 17:35:08 +0300
|Subject: [PATCH] support w3m images
|
|w3m images are a hack which renders on top of the terminal's drawable,
|which didn't work in st because when using double buffering, the front
|buffer (on which w3m draws its images) is ignored, and st draws only
|on the back buffer, which is then copied to the front buffer.
|
|There's a patch to make it work at the FAQ already, but that patch
|canceles double-buffering, which can have negative side effects on
|some cases such as flickering.
|
|This patch achieves the same goal but instead of canceling the double
|buffer it first copies the front buffer to the back buffer.
|
|This has the same issues as the FAQ patch in that the cursor line is
|deleted at the image (because st renders always full lines), but
|otherwise it's simpler and does keeps double buffering.
|---
| x.c | 2 ++
| 1 file changed, 2 insertions(+)
|
|diff --git a/x.c b/x.c
|index e5f1737..b6ae162 100644
|--- a/x.c
|+++ b/x.c
--------------------------
Patching file x.c using Plan A...
Hunk #1 succeeded at 1594.
Hmm...  Ignoring the trailing garbage.
done