* lisp/simple.el (filter-buffer-substring-function): New hook.
(filter-buffer-substring): Use it.
(filter-buffer-substring-functions): Mark obsolete.
* lisp/minibuffer.el (completion-in-region-function): New hook.
(completion-in-region): Use it.
(completion-in-region-functions): Mark obsolete.
* lisp/mail/mailabbrev.el (mail-abbrevs-setup): Use abbrev-expand-function.
* lisp/abbrev.el (abbrev-expand-function): New hook.
(expand-abbrev): Use it.
(abbrev-expand-functions): Mark obsolete.
* lisp/emacs-lisp/nadvice.el (advice--where-alist): Add :filter-args
and :filter-return.
* lisp/org/org-agenda.el (org-agenda-mode):
* lisp/org/org-indent.el (org-indent-mode): Use the `local' arg of
add-hook/remove-hook.
d36ed1c8e7