bug#33458: 27.0.50; dired loses position when reverted from outside place

[Juri Linkov]

>>> A more generic solution might be wanted for other auto-revert clients
>>> as well.  But that's more hairy and not of much use for dired anyway.
>>
>> Is it possible to fix all these problems by not resetting markers to the
>> beginning of the reverted buffer, but allowing markers to keep their
>> previous positions in reverted buffers?
>
> It might work often.  But in the cases where it does not work it will
> cause so much confusion that we won't get through with it.  AFAICT
> even the current point restoring mechanism bows out when characters
> are added/removed at the beginning of the buffer.

Maybe marker-position should allow to call a function?
For example, like 'isearch-push-state-function' remembers
an additional state as a lambda, and when an old state is
restored, a pop-fun lambda is called.  The function that
restores the buffer in the window could be the same.