bug#51032: 29.0.50; Choices for blink-matching-paren

[Eli Zaretskii]

> From: Arash Esbati <arash@gnu.org>
> Date: Thu, 07 Oct 2021 12:17:01 +0200
> Cc: 51032@debbugs.gnu.org, Stefan Kangas <stefan@marxist.se>,
>  mardani29@yahoo.es
> 
> > "Non-nil means show matching open-paren when it is on screen."
> 
> The second sentence reads:
> 
>     If nil, don’t show it (but the open-paren can still be shown
>     in the echo area when it is off screen).
> 
> My reading is this variable gives you more control in terms of: Don't
> highlight the open-paren if on-screen (either jump or highlight), but do
> if off-screen, i.e., show the position in the echo area.  But I think it
> breaks for this combination:
> 
>     (setq blink-matching-paren 'jump-offscreen)
>     (setq blink-matching-paren-on-screen nil)
> 
> which does nothing.

Right.  It should jump off-screen in that case.

I think the effect of that option was never updated when we changed
how blink-matching-paren works in Emacs 24.