* lisp/doc-view.el (doc-view-intersection):
* lisp/gnus/gnus-range.el (gnus-intersection):
* lisp/htmlfontify.el (hfy-interq):
* lisp/loadhist.el (file-set-intersect):
* lisp/mail/smtpmail.el (smtpmail-intersection): Make obsolete in
favor of seq-intersection.  Update all callers.

* lisp/url/url-dav.el (url-intersection): Redefine as obsolete
function alias for seq-intersection.  Update callers.

* lisp/mpc.el (mpc-intersection, mpc-cmd-list, mpc-reorder):
Use seq-intersection.

* lisp/mail/mail-extr.el:
* lisp/mail/rmail.el (rmail-start-mail):
* lisp/net/gnutls.el (gnutls-boot-parameters):
* lisp/net/imap.el (imap-starttls-open):
* lisp/net/pop3.el (pop3-list):
* lisp/url/url-cookie.el (url-cookie-save-interval):
* lisp/url/url-history.el (url-history-save-interval)
(url-history-track):
* lisp/url/url-mailto.el (url-mailto): Remove redundant #' before lambda.

f60eb988f6 Fix typos and omissions for (elisp)Button Buffer Commands
876b95bf90 Teach Rmail about NBSP in "Re:"

# Conflicts:
#	lisp/mail/rmail.el

* lisp/mail/rmail.el (rmail-simplified-subject)
(rmail-reply-regexp): Allow NBSP in "RE:" prefixes.

Remove some redundant `:group` args as well.

* lisp/mail/supercite.el: Use lexical-binding.
(completer-disable): Declare var.
(sc-set-variable): Don't rely on dynbind to access `help` variable.

* lisp/mail/mail-extr.el: Use lexical-binding.
(mail-extract-address-components): Avoid use of dynamic scoping to
refer to local vars.

* lisp/mail/mailabbrev.el: Use lexical-binding.
(mail-abbrev-make-syntax-table): Rename `_` variable to `syntax-_`.

* lisp/mail/mailheader.el: Use lexical-binding.
(headers): Don't declare as dynbound globally.
(mail-header-set, mail-header-merge): Declare `headers` as dynbound
locally, instead.  Mark those functions as obsolete.
(mail-header-format): Use `alist-get` instead of `mail-header`.

* lisp/mail/binhex.el (binhex-decode-region-external): Remove always-nil
var `firstline`.

* lisp/mail/emacsbug.el: Use lexical-binding.
(report-emacs-bug): Remove always-nil var `message-end-point`.

* lisp/mail/rmail-spam-filter.el: Use lexical-binding.
(bbdb/mail_auto_create_p): Declare variable.

* lisp/mail/rmail.el (rmail-get-new-mail): Remove always-nil var
`delete-files`.

* lisp/mail/rmailout.el: Use lexical-binding.
(rmail-output-read-file-name): Remove unused var `err`.
(rmail-convert-to-babyl-format): Remove unused var `count`.
(rmail-output-as-mbox): Remove unused vars `from` and `date`.

* lisp/mail/rmailsort.el: Use lexical-binding.
(rmail-sort-messages): Remove unused var `msginfo`.

* lisp/mail/rfc822.el: Use lexical-binding.
* lisp/mail/rmailedit.el: Use lexical-binding.
* lisp/mail/mailclient.el: Use lexical-binding.
* lisp/mail/blessmail.el: Use lexical-binding.
* lisp/mail/mail-hist.el: Use lexical-binding.
* lisp/mail/rmailkwd.el: Use lexical-binding.
* lisp/mail/rmailmsc.el: Use lexical-binding.
* lisp/mail/uce.el: Use lexical-binding.
* lisp/mail/unrmail.el: Use lexical-binding.

Remove redundant `:group` args.
(rmail-mime-entity): Make it a `cl-defstruct`.
(rmail-mime-entity-set-truncated): Mark as obsolete.
(rmail-mime-display): New `cl-defstruct`.
(rmail-mime-shown-mode, rmail-mime-hidden-mode, rmail-mime-raw-mode)
(rmail-mime-toggle-hidden, rmail-mime-update-tagline)
(rmail-mime-text-handler, rmail-mime-bulk-handler)
(rmail-mime-process-multipart, rmail-mime-handle, rmail-mime-process)
(rmail-mime-parse, rmail-mime-insert, rmail-show-mime): Adjust accordingly.
(rmail-mime-toggle-raw): Apply de Morgan.
(rmail-mime-insert-text): Remove unused var `tagline`.
(rmail-mime-insert-image): Remove unused var `content-type`.
(shr-inhibit-images, shr-width): Declare vars.
(rmail-mime-insert-multipart): Remove unused vars `tagline` and `body`.
(rmail-mime-insert): Remove unused var `tagline`.
(rmail-search-mime-message): Remove unused var `body-end`.

* lisp/mail/mail-utils.el: Use lexical-binding.
* test/lisp/mail/mail-utils-tests.el: New file.

* lisp/mail/rmailsum.el (rmail-summary-delete-forward): Fix
deleting backward past the beginning of the summary buffer.
(Bug#46325)