bug#33442: 26.1.90; Cairo side-by-side windows scrolling fix should be cherry-picked

[Eli Zaretskii]

> From: Ari Roponen <ari.roponen@gmail.com>
> Cc: Robert Pluim <rpluim@gmail.com>,  33442@debbugs.gnu.org,  dgutov@yandex.ru
> Date: Fri, 30 Nov 2018 14:31:51 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Robert Pluim <rpluim@gmail.com>
> >> Date: Thu, 29 Nov 2018 14:19:56 +0100
> >> Cc: 33442@debbugs.gnu.org, Dmitry Gutov <dgutov@yandex.ru>
> >> 
> >> > With the following patch, GDK_SCALE=2 seems to work for me.
> >> >
> >> 
> >> Works for me. Since this is all Cairo-only code, it could even go into
> >> emacs-26, I think (with a ChangeLog and perhaps some comments).
> >
> > OK, let's do that.
> >
> 
> The following patch fixes the scaling problem in Cairo builds.

I pushed this to the emacs-26 branch, thanks.

Not sure there was a consensus about this part:

> The
> scrolling issue with side-by-side windows is in master branch (commit
> 6e362a32bc9d21f73a0f29ca6f45481edeea6f29), and can be cherry-picked.

Thoughts?