It happens to me sometimes when I enable/disable a plugin in ccsm, and
always when I disable the Unity plugin itself. Before my last fixes
pushed to partly fix #685552, it was crashing earlier in
sigc::signal_base::impl().

Not that when a plugin is added/removed, all the plugins loaded are
destroyed and recreated. After studying a bit the reason of that crash,
it seems like the PanelMenuView is not freed after the Unity plugin is
destroyed, the signals connected are not disconnected and can still be
called. Here PanelMenuView::OnActiveWindowChanged is called even though
most of the other objects have been destroyed, in the Refresh method
it's crashing attempting to create a texture from a GpuDevice which is
NULL (already destroyed).

To fix that issue, IMO we should make sure the PanelMenuView is
correctly freed at the unity plugin destruction.

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https://bugs.launchpad.net/bugs/761368

Title:
  compiz crashed with SIGSEGV in nux::GpuDevice::GetGpuInfo()

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