"Save changes" popup stays hidden when closing window

1. Open gedit, type something in this window, open another gedit document, then break it out into a separate window or right-click tab-> "Move to new Window". Type something in this second window as well. (http://i.imgur.com/wha4fUr.png)

2. Now select the gedit Icon in the launcher, you should now get the overview mode to choose one of the two windows. ( http://i.imgur.com/eyiukGY.png)

3. Close one of the windows in overview mode, by hitting the "x". Now for a split second the "Save changes" dialog will get focus and then quickly loose focus. At this point you can hit the "X" as many times as you want and nothing happends.

I would expect this dialog to stay in focus so that I can answer and close the program. Probably the intended action would be that the window I tried closing gets focus, therefore also giving the dialog focus.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: unity 7.3.1+15.04.20150227-0ubuntu1
Uname: Linux 4.0.0-040000rc5-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Wed Mar 25 16:52:06 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:2227]
InstallationDate: Installed on 2015-03-23 (2 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150323)
MachineType: LENOVO 20BSCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.0.0-040000rc5-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: unity
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: N14ET25W (1.03 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BSCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50512 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN14ET25W(1.03):bd12/01/2014:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BSCTO1WW
dmi.product.version: ThinkPad X1 Carbon 3rd
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.1+15.04.20150303-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.59-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Wed Mar 25 16:22:22 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1049
 vendor LGD
xserver.version: 2:1.17.1-0ubuntu3