bug#49043: 27.1: ibuffer-toggle-filter-group [BUGFIX]

[Boruch Baum]

It struck me just now to perform an rzgrep on the debian emacs 27 lisp
directory for the idiom "(1+ (line-end-position)"...

./calendar/todo-mode.el.gz:4254:                                 (1+ 
(line-end-position)))
./calendar/todo-mode.el.gz:4273:            (delete-region 
(line-beginning-position) (1+ (line-end-position)))
./calendar/todo-mode.el.gz:4332:                                            (1+ 
(line-end-position))))
./calendar/todo-mode.el.gz:4683:          (delete-region 
(line-beginning-position) (1+ (line-end-position)))
./calendar/todo-mode.el.gz:4924:    (setq cat-begin (1+ (line-end-position)))
./international/quail.el.gz:2646:                            (1+ 
(line-end-position)))))))
./international/quail.el.gz:2650:         (delete-region (point) (1+ 
(line-end-position)))
./dired.el.gz:1479:                              (1+ (line-end-position))
./gnus/nnimap.el.gz:277:                           (1+ (line-end-position)))
./obsolete/otodo-mode.el.gz:450:    (let ((begin (1+ (line-end-position))))
./ibuffer.el.gz:1966:       (delete-region (point) (1+ (line-end-position)))
./ibuffer.el.gz:2030:                               (min (point-max) (1+ 
(line-end-position))))
./emacs-lisp/smie.el.gz:1457:                            (1+ 
(line-end-position)) t))
./emacs-lisp/tabulated-list.el.gz:590:      (delete-region 
(line-beginning-position) (1+ (line-end-position)))
./progmodes/dcl-mode.el.gz:802:  (let* ((default-limit (1+ (line-end-position)))
./eshell/em-unix.el.gz:646:                      (point) (min (1+ 
(line-end-position))



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