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

[Eli Zaretskii]

> Cc: Eli Zaretskii <eliz@gnu.org>, jonas@bernoul.li, 37774@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 8 Nov 2019 10:20:22 +0100
> 
> One more question: Are we sure that we want to show the background
> (underline, ...) on the newline character when we do not extend?  It
> certainly provides the information that the character is covered by
> the property or overlay at that position and also fits well when the
> cursor is positioned on it.  Yet it appears somewhat clumsy.

More clumsy than it was before installing that feature?