gnome-control-center can't configure second virtualbox display

[Rocko]

On a VirtualBox 6.0.14 host, with a fresh install of Ubuntu 19.10 and the virtualbox guest drivers installed, I can't configure a second display, although xrandr shows it to be present.

Steps:

1. Install VirtualBox
2. Install Ubuntu 19.10 as a guest with 2 displays (note: at least 2048 MB RAM is required or the guest is chronically slow during installation; I gave the displays 32 MB RAM as well).
3. In the guest, install virtualbox guest drivers and reboot.
4. Run g-c-c and go to the Devices / Displays section.

Expected result:

I can choose to Join the displays, move them around with the mouse and Apply the new settings successfuly.

Actual result:

Display 2 is shown normally but Display 1 is just a number (see attached) - I can't move it around or Apply changes.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-control-center 1:3.34.1-1ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
Date: Mon Nov 4 11:49:05 2019
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2019-11-04T11:48:33.047928

[Rocko (rockorequin)]

Here's the xrandr. It looks like 0x0 is selected for display Virtual2 and maybe this is confusing g-c-c.

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you also report it upstream on https://gitlab.gnome.org/GNOME/gnome-control-center/issues ?