Jasper St. Pierre 831bd07b0d layout: Fix several issues with the background management code
If monitor-changed fires at startup, it will destroy all of the
backgrounds, but since this._isStartup is true, won't recreate any
of them. Additionally, since _bgManagers is indexed by monitor index,
if the primary index is not 0, it could become a sparse array (e.g.
[undefined, undefined, primaryBackground]), and our for loop will
crash trying to access properties of undefined.

Fix both of these issues by always creating background managers for
every monitor, hiding them on startup but only showing them after
the startup animation is complete.

One thing we need to watch out for is that while LayoutManager is
constructing, Main.uiGroup / Main.layoutManager will be undefined,
so addBackgroundMenu will fail. Fix this by passing down the uiGroup
to the background menu code.

https://bugzilla.gnome.org/show_bug.cgi?id=709313
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GNOME Shell provides core user interface functions for the GNOME 3 desktop,
like switching to windows and launching applications. GNOME Shell takes
advantage of the capabilities of modern graphics hardware and introduces
innovative user interface concepts to provide a visually attractive and
easy to use experience.

For more information about GNOME Shell, including instructions on how
to build GNOME Shell from source and how to get involved with the project,
see:

 http://live.gnome.org/GnomeShell

Bugs should be reported at http://bugzilla.gnome.org against the 'gnome-shell'
product.

License
=======
GNOME Shell is distributed under the terms of the GNU General Public License,
version 2 or later. See the COPYING file for details.

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