* lisp/subr.el (buffer-local-set-state)
(buffer-local-set-state--get, buffer-local-restore-state): Moved
from easy-mmode.el because they have to be available run-time.
* doc/lispref/modes.texi (Defining Minor Modes): Document it.
* lisp/emacs-lisp/easy-mmode.el (buffer-local-set-state): New macro.
(buffer-local-set-state--get): Helper function.
(buffer-local-restore-state): New function.
* lisp/textmodes/word-wrap-mode.el (word-wrap-whitespace-mode):
Use it to simplify code.
* lisp/emacs-lisp/easy-mmode.el (easy-mmode--arg-docstring):
Only document the values we want to support, not the ones we
actually support.
(define-minor-mode): Partially revert to previous behaviour.
* lisp/emacs-lisp/easy-mmode.el (easy-mmode--arg-docstring):
Clarify when minor modes are switched on/off when called from lisp
(bug#44341).
(define-minor-mode): Make calls from Lisp switch the mode on/off
as documented.
* doc/lispref/modes.texi (Defining Minor Modes): Describe the new
:predicate keyword (bug#44232).
* lisp/emacs-lisp/easy-mmode.el (define-globalized-minor-mode):
Allow a new :predicate keyword.
(easy-mmode--globalized-predicate-p): New function.
