mouse back button doesn't work as expected on button bar

[Thibaut Brandscheid]

Precise up-to-date 32-Bit

What happens:
When pressing the mouse back button in the upper button bar:
1. in a non-button area, software-center doest react at all.
2. on top of a button, a left click is performed.

see attachmened image: back-buton_bug.png

What you expected to happen:
When pressing the mouse back button the 'back' action should always be
preformed whatever region the mouse pointer is above in the software-center.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: software-center 5.1.10
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
ApportVersion: 1.93-0ubuntu2
Architecture: i386
Date: Thu Mar 1 20:44:34 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120227)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Robert Roth (evfool)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #871810, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.
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