bug#56682: locked narrowing

[Eli Zaretskii]

> Date: Tue, 29 Nov 2022 17:10:27 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Eli Zaretskii <eliz@gnu.org>, Stefan Monnier <monnier@iro.umontreal.ca>, 
>     56682@debbugs.gnu.org
> 
> > Looking at the code, there is indeed some halving going on, so maybe it 
> > would be more easier to understand if the variable was called 
> > locked-narrowing-radius, and used as such -- without division.
> 
> I considered naming it with "radius", but decided not to do it.  This is 
> an implementation detail.

Maybe long-line-locked-narrowing-half-size?