bug#57796: 29.0.50; textsec-link-suspicious-p is unaware of eww-url-transformers

[Visuwesh]

I use eww-url-transformers to redirect URLs to libre front-ends of
certain websites like YouTube, Imgur, etc. however,
textsec-link-suspicious-p is blissfully unaware of this transformation
and reports false positives in certain cases.  A simple reproducer is
the following,

    1. emacs -Q
    2. Eval the following lisp code
          (defun vz/eww-url-transformer (url)
            (if (string-prefix-p "https://youtube.com/watch?v="; url)
                (concat "https://yewtu.be/watch?v";
                    (substring url (string-search "=" url)))
              url))

          (setq eww-url-transformers '(vz/eww-url-transformer))
    3. Say M-s M-w https://youtube.com/watch?v=nMqBCkxfRMk RET
    4. Scroll up to the description and see textsec highlight links to
       YouTube in red colour since now they are redirected to yewtu.be

I don't think anything can be meaningful can be done here though,
perhaps it might suffice to document this in the docstring of
eww-url-transformers.

P.S. Can we make the :foreground attribute of textsec-suspicious face to
     be white?  It is very hard to read what the link is in this case.


In GNU Emacs 29.0.50 (build 11, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2022-09-11 built on astatine
Repository revision: 9219e83b3c0ef53df02caf4c8ba38f482937ab50
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Debian GNU/Linux bookworm/sid

Configured using:
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Configured features:
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