bug#5477: 23.1.91; diary-unhide-everything sometimes doesn't

[Glenn Morris]

Stephen Berman wrote:

>   (defun diary-unhide-everything ()
>     "Show all invisible text in the diary."
>     (kill-local-variable 'diary-selective-display)
> !   (save-excursion
> !     (save-restriction
> !       (widen)
> !       (remove-overlays (point-min) (point-max) 'invisible 'diary)))
>     (kill-local-variable 'mode-line-format))

This seems fine. Is your save-excursion really necessary?