* doc/misc/gnus.texi (Customizing the IMAP Connection):
* doc/misc/smtpmail.texi (Authentication): Mention it.
* lisp/gnus/nnimap.el (nnimap-login): Support oauth2.
* lisp/mail/smtpmail.el (smtpmail-try-auth-method): New function
for oauth2.
* lisp/emacs-lisp/cl-generic.el (cl-generic-generalizers): Evaluate
forms that are eql specializers. Provide backward compatibility
with a warning.
* test/lisp/emacs-lisp/cl-generic-tests.el: Add a test.
* lisp/emacs-lisp/bindat.el (bindat--type): Adhere to the new rule.
* lisp/emacs-lisp/edebug.el (edebug--match-&-spec-op): Adhere to the new rule.
* lisp/emacs-lisp/map.el (map-into): Adhere to the new rule.
* lisp/emacs-lisp/radix-tree.el (map-into): Adhere to the new rule.
* lisp/frame.el (cl-generic-define-context-rewriter): Adhere to the new rule.
* lisp/gnus/gnus-search.el
(gnus-search-transform-expression): Adhere to the new rule.
* lisp/image/image-converter.el
(image-converter--probe image-converter--convert): Adhere to the new rule.
* lisp/mail/smtpmail.el (smtpmail-try-auth-method): Adhere to the new rule.
* lisp/progmodes/elisp-mode.el
(xref-backend-definitions)
(xref-backend-apropos): Adhere to the new rule.
* lisp/progmodes/etags.el (xref-backend-identifier-at-point)
(xref-backend-identifier-completion-table)
(xref-backend-identifier-completion-ignore-case)
(xref-backend-definitions)(xref-backend-apropos): Adhere to the new rule.
* test/lisp/emacs-lisp/checkdoc-tests.el
(checkdoc-cl-defmethod-with-types-ok)
(checkdoc-cl-defmethod-qualified-ok)
(checkdoc-cl-defmethod-with-extra-qualifier-ok): Adhere to the new rule.
* etc/NEWS: Describe the change.
* doc/misc/smtpmail.texi (Queued delivery): Document it (bug#49709).
* lisp/gnus/message.el (message-multi-smtp-send-mail): Store
variables.
* lisp/mail/smtpmail.el (smtpmail-queue-mail): Mention it.
(smtpmail-store-queue-variables): New variable.
(smtpmail-send-it): Store SMTP variables if requested.
(smtpmail-send-queued-mail): Restore variables.
* lisp/mail/rmail.el (rmail-simplified-subject): Delete `[External] :'.
(rmail-reply): In encrypted message, search for other header fields
inside the encrypted part, and use them instead of the real header.
(rmail-epa-decrypt): Don't set MIME unless it's Rmail mode.
* lisp/mail/smtpmail.el (smtpmail-send-it)
(smtpmail-send-queued-mail, smtpmail-via-smtp):
* lisp/mail/sendmail.el (sendmail-send-it): Only look at the
headers when computing the envelope from (bug#47616).
The quoted-printable estimation was obviously wrong: the size becomes
smaller when decoded, not larger...
* lisp/mail/rmailmm.el (rmail-mime-set-bulk-data): Fix estimations
of decoded MIME attachment.
* 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.
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.
* lisp/mail/rmail.el (rmail-show-message-set-modified): New
option.
(rmail-show-message-1): If 'rmail-show-message-set-modified' is
non-nil, don't reset the buffer's modified state. (Bug#45941)
* etc/NEWS: Announce the new option.
* lisp/mail/sendmail.el (mail-archive-file-name)
(mail-default-reply-to, mail-self-blind, mail-default-headers):
Say in the doc string that 'message-default-mail-headers' shall be
customized when using 'message-mode' for email composition.
(Bug#46029)
* lisp/mail/footnote.el (footnote--regenerate-alist): New function
(bug#7258).
(footnote-mode): Use it to restore footnotes after opening an old
file with footnotes.
