bug#33870: 27.0.50; xref-goto-xref not configurable

[Juri Linkov]

>> The 'display-buffer--maybe-' functions are macros in disguise invented
>> by Chong to simplify coding the rest.  Unless we can't avoid it, I
>> would not make them public because then we would have to (1) document
>> them, (2) explain the semantics of the "maybe" and (3) justify why the
>> remaining 'display-buffer--maybe-' functions are not public.
>
> _Everything_ in Emacs is (and should be) public.

I agree, I don't see how display-buffer--maybe-at-bottom
is more internal and not public than e.g. set-window-buffer
and more low-level functions.