ccsm needs an option to change launcher opacity

Bug Description

Just like the Unity plug-in in CCSM gives users a chance to change the panel opacity, the plug-in should also provide users with a way to change the launcher's opacity levels.

====================================================

* Time to fix: 2h (in hours)
* Difficulty: normal
* Implementation:

In launcher.cpp the function that takes care of drawing the background is Launcher::DrawContent. Should not be difficult adding a private member to change the alpha of the background and then using this value in DrawContent:

if (_dash_is_open)
{
gPainter.Paint2DQuadColor(GfxContext, bkg_box, _background_color);
}
else
{
/* AA is the current/default alpha value */
gPainter.Paint2DQuadColor(GfxContext, bkg_box, nux::Color(0xAA000000));
}

* Where to look: src/launcher.cpp (for the alpha)
src/unityshell.cpp (for the ccsm option)

* Workflow information: http://unity.ubuntu.com/getinvolved/

This bug was fixed in the package unity - 4.6.0-0ubuntu1

---------------
unity (4.6.0-0ubuntu1) oneiric; urgency=low

* New upstream release.
- compiz crashed with SIGSEGV in __strlen_sse2() (LP: #814619)
- PlacesHomeView::PlacesHomeView leaks memory (LP: #818450)
- PluginAdapter::MaximizeIfBigEnough leaks memory (LP: #818477)
- Launcher - Make Launcher left of screen reveal more responsive and less
prone to false positives (LP: #765819)
- Launcher - clicking on a App launcher icon incorrectly un-minimizes
windows (LP: #783434)
- Unity doesn't get any mouse wheel scroll event in Indicators InputArea
(LP: #814574)
- Unity launcher gets cluttered when having multiple partitions and/or
external volumes attached (LP: #713423)
- Unity panel menus and indicators slow to respond. Too much lag.
(LP: #742664)
- In Unity the distinction between GVolume, GDrive and GMount is a bit
confusing. (LP: #799890)
- Launcher - When a item is deleted by dragging to Trash, the trash should
pulse once before the Launcher disappears (LP: #750311)
- ccsm needs an option to change launcher opacity (LP: #815032)
- add a ccsm option to hide volumes in launcher (LP: #794707)
- scale plugin doesn't work as desired when "Click Desktop To Show
Desktop" is true (LP: #810315)
- mute/unmute sound when user clicks on sound applet using scroll button
or middle mouse button (LP: #609860)
- Secondary activate (i.e. middle click) support for indicators advanced
usage (LP: #812933)
* debian/control:
- dep on latest libunity-misc
- dep on latest nux
- add build-dep on libgnome-desktop-3-dev
* debian/rules:
- bump libunity-core-4.0-4 shlib for ABI break
- don't ship unity dialogs right now. Not ready for alpha quality
* distro-patch the grey to darker grey (until the blur is done in nux)
* Switch to dpkg-source 3.0 (quilt) format
* debian/patches/01_revert_removed_function_for_unity2d_to_build.patch:
- revert a removed API making unity-2d not building
-- Didier Roche <email address hidden> 2011年8月01日 19:53:15 +0200