bug#51883: 29.0.50; Command to get accidentally deleted frames back

[Gregory Heytings]

> > > Let's help him and be clear: this means using just (interactive "p") 
> > > without any distinction of cases, right?
> >
> > No, because I do not want to see C-u C-x 5 u undelete the fourth most 
> > recently deleted frame.
>
> What do you want in this case?

An error, something like "You didn't specify a frame number."