bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing.

[Eli Zaretskii]

> Date: Sat, 01 Apr 2023 15:41:13 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: 56682@debbugs.gnu.org, monnier@iro.umontreal.ca
> 
> > You are missing the case of R2L paragraphs, where the continuation glyph 
> > is displayed on the left.
> 
> Okay, so what would be the correct calculation here?  This?
> 
> int width = window_body_width (w, WINDOW_BODY_IN_CANONICAL_CHARS)
>    - (WINDOW_RIGHT_FRINGE_WIDTH (w) == 0
>       || WINDOW_RIGHT_FRINGE_WIDTH (w) == 0 ? 1 : 0);

Yes.