clicking again on a launcher icon should hide the window

[Amir Khosroshahi]

When you click on a application icon in the launcher it runs/comes to foreground, which is the expected behavior.
But when you click again on the icon of an application which is already in foreground, the natural/expected behavior is for the window to be hidden/minimized.

This is a better behavior than the current one because you sometimes just want to peek into another applications window quickly and hide it again. The proposed behavior makes this quick and easy as you only have to click again to go back to your previous window, while with the current behavior you have to:
1- find the icon of the previously in foreground app in the launcher.
2- move the mouse pointer to that icon and click it.

which requires attention and distracts you from focusing on your work.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.10.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic i686
.tmp.unity.support.test.0:

ApportVersion: 2.6.1-0ubuntu6
Architecture: i386
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CompositorRunning: compiz
Date: Sun Nov 18 13:54:30 2012
DistUpgraded: 2012-10-22 12:04:29,299 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
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   Subsystem: Lenovo Device [17aa:215a]
InstallationDate: Installed on 2012-06-20 (150 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MachineType: LENOVO 2516CTO
MarkForUpload: True
ProcEnviron:
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SourcePackage: unity
UpgradeStatus: Upgraded to quantal on 2012-10-22 (27 days ago)
dmi.bios.date: 02/09/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 6IET81WW (1.41 )
dmi.board.name: 2516CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6IET81WW(1.41):bd02/09/2012:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2516CTO
dmi.product.version: ThinkPad T410
dmi.sys.vendor: LENOVO
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version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
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