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

[Gregory Heytings]

Thanks for your feedback.

> Thanks.  Hmm - one kind of raw prefix arg you don't handle yet is `-` 
> which is synonymous for -1.  M-- C-x 5 u gives the not so nice error 
> message:
>
> Wrong type argument: number-or-marker-p, -

Indeed, I forgot to handle that case.

> Oh, and, I think all explicit `error' calls in your patch could be made 
> `user-error's instead, WDYT?

That makes sense, indeed.  Done.

Updated patch attached.

Undelete-deleted-frames.patch
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