bug#72059: [PATCH] Ensure that git diffs without signature (--) are properly identified

[Juri Linkov <juri@linkov.net>]

>   +(with-eval-after-load 'mm-uu
>   +  (setf (nth 1 (alist-get 'git-format-patch mm-uu-type-alist))
>   +        "^-- \\|^$"))

Indeed, this is the right thing to do.  In the past
few days I have seen more patches without attachments
that makes hard to read them without fontification.
So such change could help to greatly improve readability.
However, often there is also text after the patch,
so nil for 'end-point' doesn't look right.  So better
to end the patch with an empty line, because properly
formatted patches have no empty lines in them.

diff --git a/lisp/gnus/mm-uu.el b/lisp/gnus/mm-uu.el
index 3c7e3cbdf1a..26b2c03a3dc 100644
--- a/lisp/gnus/mm-uu.el
+++ b/lisp/gnus/mm-uu.el
@@ -173,7 +173,7 @@ mm-uu-type-alist
      ,#'mm-uu-diff-test)
     (git-format-patch
      "^diff --git "
-     "^-- "
+     "^$"
      ,#'mm-uu-diff-extract
      nil
      ,#'mm-uu-diff-test)

+ PS: the patch above should end before this line.
- I tested it on a few posts, and everything looks correct.