On Tue, Mar 29, 2022 at 02:44:28PM +0200, Lars Ingebrigtsen wrote:
> Angelo Graziosi <angelo.g0@libero.it> writes:
> 
> > Emacs builds on macOS 10.13.6 do not show scroll bars even if both
> > vertical and horizontal ones are enabled. The attached screenshot
> > refers to 'Emacs -Q'.
> 
> I can't reproduce this on Macos 12.1.

I can't reproduce it on 10.14 either. I suspect it's some subtle
difference in layer handling between 10.13 and 10.14+.

> > The first build in which scroll bars are gone or hidden looks
> >
> > 2)
> > commit: a4d2c88cdee90a3e4863a62c4ff69896d0c1a347
> > Alan Third 2021-07-31 11:13:05 +0100
> > Simplify macOS drawing code
> 
> Perhaps Alan has some comments; added to the CCs.

Maybe the attached will help.
-- 
Alan Third