Extracted from `cl-generic.el`.
* lisp/emacs-lisp/cl-generic.el (cl--generic-get-dispatcher)
(cl--generic-build-combined-method, cl-generic-generalizers): Use it.
(cl--generic-with-memoization): Delete.
* lisp/gnus/gnus-icalendar.el
(gnus-icalendar-event--get-attendee-names,
gnus-icalendar-event-from-ical): When the ROLE property
is missing from an ATTENDEE line, follow RFC5546 and default
to REQ-PARTICIPANT.
If an ical invitation is sent to a mailing list, the recipients
are probably not listed as attendees. However there are
legitimate situations where these unlisted (or indirectly listed)
recipients are still expected to respond. RFC5546 allows that,
calling those respondents "party crashers".
* lisp/gnus/gnus-icalendar.el
(gnus-icalendar-event:inline-reply-buttons): Display the response
buttons even if the user was not found in the list of attendees,
but change the labels of those buttons to make clear they are
not explicitly invited.
(gnus-icalendar-event--build-reply-event-body): Add an attendee
line for the user in case one was not found.
RFC5546 specifies that participant status (accepted, tentative,
declined) should be sent to the organizer of the event. That
organizer is not necessarily the sender of the invitation; for
instance Google Calendar uses custom email addresses to receive these
notifications.
* lisp/gnus/gnus-icalendar.el (gnus-icalendar-send-buffer-by-mail):
Replace the default recipient of the reply by the organizer of the
event.
(gnus-icalendar-reply) Pass that organizer to the previous function.
To improve performance and flexibility (bug#50777).
* lisp/progmodes/xref.el (xref-location): Remove.
(xref-file-location): Change to cl-struct.
(xref-buffer-location, xref-bogus-location): Ditto.
(xref-item, xref-match-item): Same.
And update all method definitions accordingly.
(xref--insert-xrefs): Don't use 'oref', use 'xref-item-location'.
(xref--insert-xrefs, xref-show-definitions-completing-read):
Insetad of 'with-slots', use 'xref-item-summary' and
'xref-item-location'.
* lisp/progmodes/etags.el (xref-etags-location):
Change from EIEIO class into a cl-struct.
(xref-etags-apropos-location): Ditto.
Update all method definitions.
* test/lisp/progmodes/elisp-mode-tests.el (xref-elisp-test-run):
Avoid using 'oref'.
* configure.ac (module_env_snippet_29): New.
* src/module-env-28.h: Remove the comment with instructions for
the next release.
* src/module-env-29.h: New file.
* README:
* configure.ac:
* nt/README.W32:
* msdos/sed2v2.inp: Bump Emacs version to 28.0.60.
* lisp/cus-edit.el (customize-changed-options-previous-release):
Update the last released version of Emacs.
* lisp/emacs-lisp/checkdoc.el (checkdoc-this-string-valid-engine):
In error text, say "mapvar" instead of "keymap", and "command"
instead of "function", to be consistent with the ELisp manual.
(Bug#50903)
* lisp/org/org-element.el (org-element-headline-parser):
Pretty sure this one should be `skip-chars-backward`, not
`skip-syntax-backward`, since \t isn't a valid syntax code.
