"Join displays" causes desktop icons to behave badly

[Endolith]

1. Enable "Join displays" in the Displays settings
2. Drag the displays so that they are staggered
3. Set the right side display to Primary
4. Right-click the desktop and select "Organize desktop by name"

Problem 1: The icons will all move to the secondary display instead of the Primary display
Problem 2: The icons will extend beyond the screen, into the empty space caused by the staggering.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-control-center 1:3.28.2-0ubuntu0.18.04.2
ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
Uname: Linux 4.15.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 9 23:30:14 2018
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2016-09-14 (816 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
ProcEnviron:
 XDG_RUNTIME_DIR=<set>
 SHELL=/usr/bin/fish
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to bionic on 2018-08-19 (113 days ago)

[Sebastien Bacher (seb128)]

Thank you for your bug report, that's basically a variant of bug #1726717