bug#37774: 27.0.50; new :extend attribute broke visuals of all themes and other packages

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: andreyorst@gmail.com,  spacibba@aol.com,  37774@debbugs.gnu.org
> Date: Wed, 16 Oct 2019 13:38:43 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > It was intentional, meaning the assumption was that extending the face
> > past the last character on the line makes little sense in general.
> > IOW, preventing the extension for most faces was the main point of the
> > change.
> 
> Ok.  But it obviously created a lot of fallout to fix.

Not clear yet, at least not to me.  But it's possible.