rearranging screens causes confirmation dialog to be displayed outside screen

[Karl-Philipp Richter]

When I open the dialog to rearrange screens logically and apply the change they have to be confirmed. If I open the dialog on the primary screen the confirmation dialog is opened on the secondary screen an reachable. If I open the dialog on the secondary screen, the confirmation dialog is opened outside the screen and not reachable. After the timeout the screens are reset. Rearranging screens is thus not possible.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: unity 7.3.2+15.04.20150420-0ubuntu1
Uname: Linux 4.0.1-040001-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CompizPlugins: »/apps/compiz-1/general/screen0/options/active_plugins« wurde kein Wert zugewiesen
CurrentDesktop: Unity
Date: Mon Jun 1 17:00:12 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (59 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: No upgrade log present (probably fresh install)