Various parts of Emacs manipulate `buffer-undo-list' in various ways.
`revert-buffer' may reset it. Some applications temporarily bind it to
t to avoid, for example, recording text property changes. Finally undo
recording may be switched off. Should `pending-undo-list' be affected
by all these and how?
We have no need to worry about this now.
If and when someone implements a more powerful undo facility,
we will see what kind of support it needs.
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