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

[Juri Linkov]

>> But still there is one xref command, namely `xref-goto-xref' bound to
>> RET in the *xref* buffer that always displays the buffer in the
>> predefined window, and there is no way to change this behavior.
>
> How would you like to change this behavior, and why?  There are quite
> a few tricky use cases, which took us some of time to get right, and I
> wouldn't like to break them.

Since we have a convention that code displaying a buffer in the
window have to obey display actions that are customizable by
`display-buffer-alist', `display-buffer-overriding-action',
and other display related variables (e.g. like implemented
recently with switch-to-buffer-obey-display-actions),
I see no reason why *xref* should differ from *grep* or *Occur*.
It should not involve more complexity than necessary.