bug#29713: 26.0; Provide completion for `make-frame-on-display'

[Juri Linkov]

>> > Or maybe better to fall back to 'make-frame'?
>> > I.e. don't signal an error, don't ask a question,
>> > just create a new frame on the current display.
>> >
>> > So on --without-x builds, make-frame-on-display
>> > could be like an alias to make-frame.
>>
>> I have no strong preference between this option or just signalling an
>> error in the interactive spec.  What do others think?
>
> I think we should signal an error: the user will not get what they
> want, so the user must be told.

I agree.