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'.
* 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.
(ess-eval-visibly-p): Declare.
(org-babel-julia-assign-elisp): Remove unused vars `header` and
`row-names` and corespondingly remove now unused args `colnames-p` and
`rownames-p`.
(org-babel-variable-assignments:julia): Adjust call to
`org-babel-julia-assign-elisp` accordingly.
(org-babel-julia-initiate-session): Use `bound-and-true-p`.
(org-babel-julia-evaluate-external-process)
(org-babel-julia-evaluate-session, org-babel-julia-evaluate):
Remove unused arg `row-names-p`.
(org-babel-execute:julia): Adjust call to
`org-babel-julia-evaluate` accordingly.
* etc/NEWS: Announce the addition of the command.
* lisp/erc/erc.el (erc-cmd-WII): Add '/wii' convenience command which
calls the '/whois' command with the given nick as both arguments,
which is useful for displaying the whois information for the nick
along with idle time, even if the nick is on a different server than
the one we are currently connected to.
* etc/NEWS: Remove unneeded entry.
* lisp/erc/erc.el (erc-cmd-WHOIS): Restore the previous order of
arguments sent to the server, so that there's no change in the
function's behavior. Instead, rename the arguments to be more
accurate, and expand upon them in the doc string.
* etc/NEWS: Describe the change.
* lisp/bindings.el (global-map): Add bindings for 'undo-redo'.
* lisp/simple.el (undo-no-redo): Turn into a user option.
* lisp/gnus/message.el (message-newline-and-reformat): Only search
for previous/next cited lines that have space, because it's the
space we're trying to find.
