Overlay scrollbars shows on the wrong virtual desktop

[Simon Strandman]

1. Choose to auto hide the launcher.
2. Open a window with scrollbars and snap it to the right side of desktop two.
3. Go back to desktop one and move the pointer to the left side.
4. The overlay scrollbar from the window on the other desktop will now show on the current desktop.

See the attatched screenshot.

I know this is a minor problem but it's ugly. :)

Two things could be improved here IMO:
1. If you snap a window to the edge of a desktop the window border should be perfectly alligned with the edge of the desktop and not show on the desktop next to it.
2. Windows that goes outside the right edge of the right desktop shouldn't show on the left side of the left desktop.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: overlay-scrollbar 0.2.16+r357-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Sun Nov 18 16:50:58 2012
InstallationDate: Installed on 2012-10-10 (38 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121010)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
SourcePackage: overlay-scrollbar
UpgradeStatus: No upgrade log present (probably fresh install)