This works for metacity's compositor because it displays a static
snapshot of the window, which it can save when the window is minimised.

Compiz could do this also, but won't.  It's a hack to work around a
limitation of the X server, which the upstream Compiz maintainers are
resistant to - especially since the X infrastructure for a proper
solution is in the pipeline.

This would be a major patch for Ubuntu to carry against upstream compiz.
It will be fixed, eventually, by the addititon of extra X
infrastructure.  That's why this is marked as WontFix.

-- 
Window Previews plugin - incorrect behavior
https://bugs.launchpad.net/bugs/147872
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