Re: master ce4ec17: Fix display-buffer-override-next-command to call action only once (bug#39722)

[Juri Linkov]

>> 2. to allow adding arguments to the commands `C-x 4 4` and `C-x 5 5`.
>
> That's the problem, indeed.  It introduces two different kinds of
> prefixes: those that only apply to "normal commands" and those that also
> apply to (some) prefixes.
>
> I'd rather try and avoid this complexity because I think it will become
> problematic as more prefix commands get written.  E.g. the ordering
> problem doesn't only affect `C-u` but all other prefix commands, such as
> `C-x RET c` (there currently aren't others bundled with Emacs, but there
> are others out there).

Hmm, I didn't know that set-buffer-file-coding-system supports a prefix arg:
`C-u C-x RET f`.