bug#3142: 23.0.92; split-window-prefered-function should be able to use split-window-horizontally/split-window-vertically

[martin rudalics]

> How about adding two wrapper functions?
>
>   (split-window-preferred-vertically &optional window)
>   that calls split-window-vertically
>
>   (split-window-preferred-horizontally &optional window)
>   that calls split-window-horizontally

I can't really comment that because the current behavior seems already
confusing enough.  At least that's the impression I got from Jared's
mail.  Personally, I'm always confused by -window (-buffer) functions
that do not have a window (or buffer) as first argument :-(

martin