bug#65451: 30.0.50; `after-change-functions' are not triggered in the same order the changes are made

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

> Thinking about this some more, we will need to consider whether this
> list of accumulated transactions is ever compacted by deleting old
> transactions, or we let it grow indefinitely.  If the former, we
> should consider the case where more than one feature wants to track
> buffer edits (so it is impossible to remove entries once they have
> been processed by a single consumer).

What I propose is actually quite similar to `buffer-undo-list'.
But a bit less generic - (apply FUN-NAME ARGS) entries cannot be handled
outside the narrow scope of `undo'.
Similar to `buffer-undo-list' it needs to be compacted.

To not lose the information when the edit history is compacted, there
may be a hook executed right before the compaction, so that all the
users can update their state as needed.

-- 
Ihor Radchenko // yantar92,
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