[nvidia] minimized windows are white in the window spread

Bug Description

1. have two firefox windows opened
2. minimize one
3. get the other one focused
4. click on the firefox icon in the launcher to scale them
-> the minimized window is scaled, but its content is blank.

Minimized windows are missing their contents in the Super+W window spread. The window decorations are there, but the contents of the window appear blank white.

I'm using the Oneiric proposed channel, so it might have something to do with the latest updates to Unity or Compiz.

With one window minimised, I still see contents in both firefox windows. Using intel graphics.

The latest fix works well here with nvidia
(Did seem to introduce a very minor sometimes glitch when using spread with windows like nautilus, firefox, ect. A small white line can show momentarily below the window deco in one of the windows, doesn't happen all the time & quite easy to ignore

This bug was fixed in the package unity - 5.10.0-0ubuntu3

---------------
unity (5.10.0-0ubuntu3) precise-proposed; urgency=low

[ Oliver Grawert ]
* Enable subarch specific quilt support
* add linaros disable_standalone-clients.patch to make unity build with GLES

[ Didier Roche ]
* remove a symlink and replace with a real file for
debian/patches/series.<arch> as not supported in non v3 (and we don't
want v3 format with full source upstream derived branch)

unity (5.10.0-0ubuntu2) precise-proposed; urgency=low

[ Ricardo Salveti de Araujo ]
* Enabling build with OpenGL ES2.0 support for ARM and disable maintainer
mode on that arch to avoid -Werror failure (LP: #980544)

unity (5.10.0-0ubuntu1) precise-proposed; urgency=low

* New upstream release:
- bamfdaemon crashed with SIGABRT in g_assertion_message() (LP: #926208)
- We are using 1 bad hack for compiz hanging on startup (LP: #963264)
- GConf backend steals glib events from compiz (LP: #965220)
- when I closed QupZill brawser it crashed and then and then I sow
worrning that compiz crashed but fire fox and chrome is estle working.
gtk-window-decorator crashed with SIGSEGV in max_window_name_width()
(LP: #948580)
- compiz crashed with SIGSEGV in std::basic_string<...>::basic_string()
from unity::launcher::HudLauncherIcon::HudLauncherIcon()::{lambda} from
unity::UBusManager::OnCallback (LP: #964897)
- unity-panel-service crashed due to heap corruption in g_free() from
service_proxy_name_changed() [libindicator/indicator-service-
manager.c:574] (LP: #969360)
- Opening dash while an application is maximized makes unity completely
useless, have to relogin (LP: #975103)
- unity crash on alt-tab (LP: #975168)
- Top bar - Menus should be condensed to fit panel/overlay of appmenu
(LP: #655184)
- Topbar - window controls for maximised windows in the top bar should
conform to Fitts's law (LP: #839690)
- [FFe, UIFe] Dash - When the Dash is open and there is a maximised app in
the background, the top bar background should not disappear
(LP: #839480)
- Dash - The inner bottom left, bottom right and top right corners of the
desktop dash border are rendered incorrectly (LP: #839476)
- Showdesktoped window contents invisible in window spread (LP: #877778)
- Maximized windows can be accidentally closed from wrong monitor.
(LP: #865701)
- Unity launcher on-screen corruption on resume from suspend with nVidia
proprietary driver (LP: #915265)
- Launcher - Inserting items into launcher makes unnecessary animations on
other monitors (LP: #925021)
- Far left character in panel (and launcher popups) distorted
(LP: #927441)
- Jenkins build failure: SetAcceptKeyNavFocusOnMouseEnter not declared
(LP: #938037)
- super+<unbound key> and sometimes super+<number> keys now cause launch
to wedge with the key hints shown and retains focus instead of selecting
the requested window (LP: #934084)
- three-finger move does not move (Precise) (LP: #940612)
- compiz crashed with SIGSEGV in std::__de...

After last update, Unity 5.10 installed the problem persists for me.

Open several applications (thunderbird, google chrome, nautilus, etc...)
minimize google chrome to unity launcher.
trigger expo mode 'super + w'

chrome window appears as a white square in expo mode.

screenshot attached.