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

[Juri Linkov]

>> The entire
>>
>>      (and (not (frame-parameter nil 'unsplittable))
>>           (let ((split-height-threshold 0))
>>             (setq window (window--try-to-split-window bottom-window alist)))
>>           (window--display-buffer buffer window 'window alist))
>>
>> is bad design.
>
> Removed now from master's 'display-buffer-at-bottom'.

Thanks, glad to see how just removing code is an improvement.
Maybe we could remove more code to fix other problems ;-)