bug#34749: 26.1; `delete-windows-on': (1) doc, (2) bug, (3) bug, (4) candidates

[Drew Adams]

>  > Are you asking what "\nP" means/does?
> 
> Yes.

>  > This is pretty well documented in (elisp)
>  > `Using Interactive' and (elisp) `Interactive Codes'.
>  >
>  >    separated by newlines, one for each argument...
>  >    The code letter ‘P’ sets the command’s first argument
>  >    to the raw command prefix...
> 
> It's clear for you since you probably write such specifications all
> the time.

Yes.  Looking at some existing Elisp code is a good
way to get this.  I probably did that too at some
point, in addition to consulting the doc.

> I hope it's now clear for me as well after reading that
> text a couple of times.

If it can be made clearer then we should try to do so.