Persistent undo and force quit

I have persistent undo turned on.  I noticed this behavior:

- If I edit a file, make a change and don't save it, execute :qall!, edit the file again, and try to redo, the change is gone.

- If I edit a file, make a change, undo it, save the file (essentially making no change to the file on disk), quit, edit the file again, and try to redo, the change is made!  The undo tree was saved even though there was no change to the file.

I would like to get vim to save the undo history even if I make an edit and then execute :qall!.  Is there any way to do that?

- Dave

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