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[Bug 937700] [NEW] Ubuntu 12.04, compiz snap plugin behaves inconsistently when dragging snapped windows in Expo mode


Public bug reported:

This issue occurs when any application window has been snapped in any
position of the screen, in the background, and a fullscreen application
is in the foreground. When going into Expo zoom-out mode, to see all 4
desktops, and you try and drag the fullscreen application to another
desktop. The screen will perform a really ugly flicker screen corrupt,
and drag any and all SNAPPED windows below the fullscreen app with it to
the other desktop. You can clearly see this happening while the flicker
takes place and the original desktop is left blank.

BUT if you were to instead double click the  original, now blank,
desktop to return to it, you will find the snapped windows are in fact
left behind and the fullscreen app has been moved. BUT if you instead
dbl click on the new desktop, where you have moved the fullscreen app
to, you will find that the snapped apps did in fact move with it.

This happens when the window has been snapped using the mouse to drag or
using the shortcut keys ctrl-alt-1/2/3/4/5/6/7/8/9. It occurs in both
64bit and 32bit versions. This also happens with any application, not
just terminal.

I have tested this issue on my current main Dell XPS laptop, installed
with 64bit 12.04 (nouveau driver) and this occurs in a Virtual machine
running in virtualbox with software 3d rendering.

So the issue is not related to platform or graphics driver. It's easily
reproduceable. Note this issue ONLY occurs with snapped windows, does
not happen with windows that are not snapped.

Please see my atattached video of this issue in 32bit virtual machine

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: compiz 1:
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
ApportVersion: 1.92-0ubuntu1
Architecture: i386
CompizPlugins: [core,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Tue Feb 21 13:01:05 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus: virtualbox-guest, 4.1.8, 3.2.0-17-generic-pae, i686: installed
GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef] (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120220)
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
MachineType: innotek GmbH VirtualBox
PackageArchitecture: all
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic-pae root=UUID=a0a1f314-d62e-4234-8e3b-b8f22ad833c0 ro quiet splash vt.handoff=7
Renderer: Software
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH
version.compiz: compiz 1:
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: apport-bug compiz-0.9 i386 precise regression reproducible ubuntu

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  Ubuntu 12.04, compiz snap plugin behaves inconsistently when dragging
  snapped windows in Expo mode

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