bug#45660: 28.0.50; Changed word/whitespace syntax

[Eli Zaretskii]

> Cc: 45660@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 5 Jan 2021 19:53:13 +0100
> 
>  > Should the word characters separated by NO-BREAK SPACE by treated as one 
> word?
> 
> 'forward-word' should stop but a line should not be broken there.  So
> IIUC this is a question of what's cheaper in terms of implementation.

We don't break lines according to syntax, we break them according to
"line breakable" category and other rules.