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

[Eli Zaretskii]

> Cc: 37774@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 17 Oct 2019 19:46:16 +0300
> 
>  > It should perhaps tell you something important about the change.
> 
> That is this case you're willing to weather the storm of complaints from 
> users that dislike change, even purely visual like this one?

No, that I consider this change a no-brainer and not really a
significant change at all.