bug#32932: 27.0.50; render bugs on macOS Mojave

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Tue, 28 Jan 2020 12:11:20 -0800
> Cc: 32932@debbugs.gnu.org
> 
> On Tue, Jan 28, 2020 at 12:07 PM Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > Have you tried setting scroll-conservatively to 101?
> 
> Yes, I use:
> 
> (setq scroll-margin 3
>       scroll-preserve-screen-position t
>       scroll-conservatively 101)

In that case, you should never see "the screen and the point jump half
way across the screen every time you need to see one more line."
Setting scroll-conservatively that way causes Emacs to scroll in
exactly one line when you want to see one more line.