How can i implement the Multi-Workspaces in the weston?

[wayland]

Dear Kristian:
     Recently we folks are trying to build a desktop-shell based on 
Weston project. Just as any other modern
Linux Desktop, we are gotta implement the "Multi-Workspaces", a.k.a 
"Virtual Desktops".

     For the convenience of discussion, we take a GNOME3 snapshot as the 
example, which is attached
below. As we can see, there is one Top-Level window that would be showed 
at two places, one showed
in the current Workspace, another showed in the corresponding snapshot 
of the current workspace at
the right side. Here I propose one questions to you ^-^

         How should I clone the Top-Level Window in the snapshot of 
workspaces properly ?
         Right now we just create extra Weston Surfaces at the 
Compositor Side and make it adapt the
         texture id representing the same top-level window.
         Since those extra  Weston Surfaces directly created at the 
Compositor Side don't belong to any Wayland Client.
         Is this an appropriate way or  disallowed or deprecated ??


         p.s.  We are always expecting that our Graphics Hero(which is 
you) to announce the 0.9 version, have a good day~

                                                                         
                     Marvin



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