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>
> Date: Tue, 20 Nov 2018 10:15:09 +0200
> 
> Scrolling in --with-cairo -build doesn't work when there are
> side-by-side split windows. That was fixed in the master branch by
> commit 6e362a32bc9d21f73a0f29ca6f45481edeea6f29
> 
>     Author: Ari Roponen <ari.roponen@gmail.com>
>     Date:   Sun May 6 15:29:28 2018 +0300
>     
>         Fix cairo scrolling for side-by-side windows
>         
>         * src/xterm.c (x_scroll_run) [USE_CAIRO]: Fix scrolling for
>         side-by-side split windows.  (Bug#31288)
>     
> Cherry-picking that commit fixes the problem in 26 branch too.

Thanks, but I'm not convinced we should backport that change.  We
don't fix every bug on the release branch, only the important onces.
And the Cairo configuration doesn't strike me as important, what with
all the additional known bugs specific to it.

That said, I'm open to arguments to the contrary.