Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up st-0.9.3/config.def.h st-0.9.3-optionscheme/config.def.h
|--- st-0.9.3/config.def.h	2025-08-09 16:00:58.350298234 +0300
|+++ st-0.9.3-optionscheme/config.def.h	2025-12-23 18:36:25.103329012 +0300
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 93.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up st-0.9.3/st.1 st-0.9.3-optionscheme/st.1
|--- st-0.9.3/st.1	2025-08-09 16:00:58.350298234 +0300
|+++ st-0.9.3-optionscheme/st.1	2025-12-23 21:02:54.482654368 +0300
--------------------------
Patching file st.1 using Plan A...
Hunk #1 succeeded at 4.
Hunk #2 succeeded at 30.
Hunk #3 succeeded at 59.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up st-0.9.3/st.c st-0.9.3-optionscheme/st.c
|--- st-0.9.3/st.c	2025-08-09 16:00:58.350298234 +0300
|+++ st-0.9.3-optionscheme/st.c	2025-12-23 15:20:01.557773970 +0300
--------------------------
Patching file st.c using Plan A...
Hunk #1 succeeded at 1014.
Hunk #2 succeeded at 1038.
Hunk #3 succeeded at 1366.
Hunk #4 succeeded at 1421.
Hunk #5 succeeded at 1887.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up st-0.9.3/st.h st-0.9.3-optionscheme/st.h
|--- st-0.9.3/st.h	2025-08-09 16:00:58.350298234 +0300
|+++ st-0.9.3-optionscheme/st.h	2025-12-23 15:26:23.537781366 +0300
--------------------------
Patching file st.h using Plan A...
Hunk #1 succeeded at 59.
Hunk #2 succeeded at 130.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up st-0.9.3/x.c st-0.9.3-optionscheme/x.c
|--- st-0.9.3/x.c	2025-08-09 16:00:58.350298234 +0300
|+++ st-0.9.3-optionscheme/x.c	2025-12-23 21:04:02.912657886 +0300
--------------------------
Patching file x.c using Plan A...
Hunk #1 succeeded at 140.
Hunk #2 succeeded at 153.
Hunk #3 succeeded at 787.
Hunk #4 succeeded at 804.
Hunk #5 succeeded at 855.
Hunk #6 succeeded at 1129.
Hunk #7 succeeded at 1160.
Hunk #8 succeeded at 1181.
Hunk #9 succeeded at 1205.
Hunk #10 succeeded at 1224.
Hunk #11 succeeded at 1441.
Hunk #12 succeeded at 1453.
Hunk #13 succeeded at 1560.
Hunk #14 succeeded at 1713.
Hunk #15 succeeded at 2047.
Hunk #16 succeeded at 2104.
done