save-under inheritance

Hi to all on the new list.

I was making a demo for save_under feature, and found it necessary to add this
line in frames.c:

list_frame_generator (Lisp_Window *w)

   if (w->frame == 0)
        /* create the frame */
        wa.override_redirect = True;
+       wa.save_under = w->attr.save_under;

With that, my save_under demo worked.
apparently it needs in XF86Config:
    Option      "backingstore"   

    you can find the demo at:


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