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

[Eli Zaretskii <eliz@gnu.org>]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Tue, 26 Nov 2019 00:45:56 +0100
> Cc: Juri Linkov <juri@linkov.net>, 37774@debbugs.gnu.org
> 
> > Is there something else to be developed?  I wasn't aware of anything
> > that didn't get implemented already.
> 
> Near the end of this thread
> 
> https://lists.gnu.org/archive/html/emacs-devel/2019-10/msg00590.html 
> 
> Ergus said:
> 
>  Somehow this is related with something we discussed some time ago, about
> the fact that we should call extend_face_to_end_of_line in the last line
> of the buffer if not empty in some conditions (dfci is active for
> example.)
> Maybe you remember that we don't have the indicator for the last line,
> which somehow we agreed must be corrected. In this case the problem is
> the same: the extend_face... function is not called for the latest line
> in the buffer but I didn't find a better condition to fix this (I didn't
> try very hard either) But probably it just requires to extend a
> condition in an if and part of this problem will be fixed (the case for
> the last line at least)
> There are some conditions in the display_line function to not call
> extend_face_to... when the line ends at ZV, fixing this condition we
> should be done right?
> 
> Was this resolved / fixed?

I responded to that in that discussion.  Basically, I don't think this
is a problem, certainly not one that needs to prevent us from starting
the pretest.