Use same assumptions as layergc about what layer kind is approprate for
unwrapping pixmap operations. This makes sure the accelerated code gets invoked for pixmaps Add pixmap migration support to kaa. Can't quite automatically migrate pixmaps off-screen, but soon we will. Can kick objects out of video memory. Move per-screen linked list pointers to pixmap private. Wrap Composite in preparation for migrating pixmaps. Have kasync ignore drawable type so that pixmaps trigger sync Add KdOffscreenFini to cleanup on server reset. Switch off screen area to have only a 'save' function; moving objects to off screen memory is done by saving then freeing the area.
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