bug#60886: 29.0.60; split-root-window-below broken for split-window-keep-point

[Juri Linkov]

>> I proposed the same in bug#56767.
>
> That would have avoided nonsense like retrieving 'window-point' of an
> uninvolved window or the 'quit-restore' parameter of an internal window.

Maybe if it's an internal window it should fall back to the selected window
to get the 'quit-restore' parameter?

OTOH, the new argument WINDOW-TO-SPLIT makes sense for
split-window-below and split-window-right when it's not
an internal window, to be able to split any non-selected window.