half-maximized window shifts when switching workspace views

[Andrey Gelman]

Open gnome-terminal (Ctrl-Alt-t).
Half-maximize it (Ctrl-Alt-KeyPad8).
Switch workspace view forth and back (Ctrl-Alt-DownArrow, Ctrl-Alt-UpArrow).
The half-maximized window is shifted to the right screen border ignoring the presence of the Unity bar.
In the screenshots attached:
before - is taken prior to workspace switching
after - is taken after
Looks like gnome-terminal is affected, whereas Nautilus is not, but possibly I miss some kind of correlation.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.18.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-38.61-generic 3.2.37
Uname: Linux 3.2.0-38-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,mousepoll,regex,vpswitch,snap,gnomecompat,place,wall,move,resize,imgpng,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
Date: Sun Mar 17 12:07:45 2013
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2013-01-01 (74 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.