Cannot set per display scaling from `Displays` applet

[Jack Burgess]

(First of all, this is my first ever bug report :tada: so some information may be missing)

Ubuntu Budgie 17.10
gnome-control-center - 1:3.26.2-0ubuntu0.2

Using the `Displays` applet, I am trying to set my primary display to have 200% scaling.
However, this causes all displays to use that setting.
I can change other settings for my external display (and the `Apply` button appears) but when I change the scaling setting to 100%, I am unable to save!

I submitted a report initially to https://github.com/UbuntuBudgie/budgie-desktop-environment/issues/91, but they have directed me here. Apologies if this is in the wrong place - please move around if need be.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.26.2-0ubuntu0.2
ProcVersionSignature: Ubuntu 4.13.0-38.43-generic 4.13.16
Uname: Linux 4.13.0-38-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Wed Apr 18 13:57:34 2018
InstallationDate: Installed on 2018-02-07 (70 days ago)
InstallationMedia: Ubuntu-Budgie 17.10 "Artful Aardvark" - Release amd64 (20180106)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thanks, the upstream report is the right thing to do, unsure why you got asked to filed downstream as well but it's fine, we can watch what they do from it

[Sebastien Bacher (seb128)]

Oh, you reported to github not on GNOME's gitlab which would be the upstream location, sorry about the confused comment.

[Sebastien Bacher (seb128)]

That's known upstream as well, see https://gitlab.gnome.org/GNOME/gnome-control-center/issues/17