Lars Ingebrigtsen <larsi@gnus.org> writes:

> miha@kamnitnik.top writes:
>
>> My idea to solve this is to record process mark and related marker
>> positions as `apply' entries in the undo list. Attached patch implements
>> this for comint and eshell.
>
> Hm, interesting...  The patch looks good to me, but I'm not really that
> familiar with undo internals myself, so it'd be good to get more
> opinions on this first.  So I've added Stefan to the CCs.

So after thinking about this some more, I arrived at a simpler solution:
deleting and reinserting text to generate suitable undo list entries
instead of adding them explicitly.
As opposed to the first patch, this one should also handle
undo-in-region reasonably well.