Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up -x dwm -x '*.o' -x compile_commands.json dwm-6.6-orig/config.mk dwm-6.6/config.mk
|--- dwm-6.6-orig/config.mk	2025-12-22 13:50:11.321481527 +0100
|+++ dwm-6.6/config.mk	2025-12-22 13:51:06.720057380 +0100
--------------------------
Patching file config.mk using Plan A...
Hunk #1 succeeded at 25.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up -x dwm -x '*.o' -x compile_commands.json dwm-6.6-orig/dwm.c dwm-6.6/dwm.c
|--- dwm-6.6-orig/dwm.c	2025-12-22 13:50:11.322481536 +0100
|+++ dwm-6.6/dwm.c	2025-12-22 13:52:08.649643404 +0100
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 40.
Hunk #2 succeeded at 50.
Hunk #3 succeeded at 93.
Hunk #4 succeeded at 146.
Hunk #5 succeeded at 270.
Hunk #6 succeeded at 414.
Hunk #7 succeeded at 604.
Hunk #8 succeeded at 799.
Hunk #9 succeeded at 1146.
Hunk #10 succeeded at 1161.
Hunk #11 succeeded at 1259.
Hunk #12 succeeded at 1417.
Hunk #13 succeeded at 1675.
Hunk #14 succeeded at 1693.
Hunk #15 succeeded at 1875.
Hunk #16 succeeded at 1937.
done