RE: [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames.

[Herring, Davis]

> but this requires a kind of
> finalization for saved_window_data objects (when such an object dies,
> it's finalizer should clear corresponding bits in all recorded windows).

Not that you're implementing this just now, but you'd have to use a reference 
count, since more than one window configuration could refer to a window.

Davis