Lexvars with special names like 'ignored' or 'unused' are no longer
treated specially.

* lisp/ansi-color.el (ansi-color-process-output):
* lisp/cus-edit.el (customize-apropos-options):
* lisp/cus-theme.el (customize-create-theme):
* lisp/dired-aux.el (dired-hide-all):
* lisp/emacs-lisp/crm.el (crm--choose-completion-string):
* lisp/emacs-lisp/tabulated-list.el (tabulated-list-revert):
* lisp/ido.el (ido-choose-completion-string):
* lisp/international/mule-diag.el (describe-font-internal):
* lisp/mail/sendmail.el (sendmail-user-agent-compose):
* lisp/progmodes/fortran.el (fortran-uncomment-region):
* lisp/progmodes/prolog.el (prolog-inferior-guess-flavor):
* lisp/progmodes/ruby-mode.el (ruby-indent-line, ruby-indent-exp):
* lisp/url/url.el (url-mm-callback):
* lisp/xwidget.el (xwidget-webkit-history-reload): Prepend an
underscore to unused function parameter names.
* lisp/emacs-lisp/cconv.el (cconv--dummy-var): Remove unused
constant.
* lisp/files.el (hack-local-variables-filter): Remove unused lexvar.

* lisp/url/url.el (url-retrieve-synchronously): Don't kill the
process buffer unless we made one (bug#58218).  This makes HTTP
free connection marking work on premature timeouts.

The w3 package was removed from GNU ELPA in 2020 as it doesn't run on
a recent Emacs, and development had stopped over a decade before that.
If anyone wants to revive the w3 package, they should look this all
over, but it doesn't make sense for us to maintain this support code.
Ref: https://debbugs.gnu.org/25395

* lisp/net/browse-url.el (browse-url-w3): Make obsolete.
(browse-url--browser-defcustom-type)
(browse-url-default-browser):
* lisp/ffap.el (ffap-url-at-point, ffap-file-at-point):
* lisp/net/newst-plainview.el (newsticker--buffer-do-insert-text):
* lisp/net/newst-reader.el (newsticker-html-renderer)
(newsticker-show-news):
* lisp/net/newst-treeview.el (newsticker--treeview-render-text):
* lisp/org/ol.el (org-store-link):
* lisp/url/url.el (url-retrieve): Remove w3 support code and related
documentation and comments.  (Bug#56435)

* test/lisp/net/browse-url-tests.el
(browse-url-tests-browser-kind): Adjust test for above changes.

* etc/TODO: Remove TODO to install W3.
* doc/misc/org.org (Handling Links): Don't mention W3.
* lisp/msb.el (msb--few-menus, msb--very-many-menus): Check for
eww-mode instead of w3-mode.

* lisp/url/url.el (url-retrieve-synchronously): Use
`accept-process-output' on a null process.  That is the safer, more
conventional way of achieving non-blocking sleep-for (bug#49897).

Also rewrite for greater readability.

* lisp/url/url.el (url-retrieve-internal): Propagate
asynchronousness correctly when using a proxy (bug#49570).

Copyright-paperwork-exempt: yes

* lisp/url/url-dav.el: Use lexical-binding.
(url-dav-process-DAV:prop): Remove unused var `handler-func`.
(url-dav-lock-resource): Remove unused var `child-url`.
(url-dav-active-locks): Remove unused var `properties`.
(url-dav-delete-directory): Remove unused var `props`.
(url-dav-file-name-completion): Remove unused var `result`.

* lisp/url/url-expand.el (url-expand-file-name): Use \s

* lisp/url/url-file.el (url-file): Improve regexp.

* lisp/url/url-gw.el: Use lexical-binding.
(url-open-stream): Remove unused var `cur-retries`, `retry`, `errobj`.

* lisp/url/url-imap.el: Use lexical-binding.
(imap-username, imap-password): Declare.

* lisp/url/url-mailto.el: Use lexical-binding.
(url-mailto): Remove unused var `func`.  Use `push`.

* lisp/url/url-news.el: Use lexical-binding.
(url-news): Remove unused var `article-brackets`.

* lisp/url/url-cid.el:
* lisp/url/url-cache.el:
* lisp/url/url-about.el:
* lisp/url/url-tramp.el:
* lisp/url/url-proxy.el:
* lisp/url/url-privacy.el:
* lisp/url/url-nfs.el:
* lisp/url/url-ldap.el:
* lisp/url/url-misc.el:
* lisp/url/url-methods.el: Use lexical-binding.

Run "TZ=UTC0 admin/update-copyright".

* lisp/url/url.el (url-warn): Make into obsolete alias for
display-warning.
* lisp/url/url-auth.el (url-register-auth-scheme):
* lisp/url/url-news.el (url-news-open-host):
* lisp/url/url-proxy.el (url-find-proxy-for-url): Adjust callers.