bug#60143: 29.0.60; command `undo-redo` don't restore cursor position

[Stefan Monnier]

> So I very much hesitate to change this.  Stefan, any comments?

Changing that code is likely wrong, indeed.  If the undo doesn't get
you where you expected, it should usually be changed by adding an
additional record to the undo log.

That "record" is a simple integer indicating the position of point at
that moment (citing `C-h o buffer-undo-list`):

    An entry of the form POSITION indicates that point was at the buffer
    location given by the integer.  Undoing an entry of this form places
    point at POSITION.

As for whether we should add such a record in the OP's scenario, and how
to do that, I haven't looked at his scenario in enough detail to have
much to say about it.


        Stefan