Re: I prefer horizontal split of windows

[rgb]

> when emacs displays 'extra' information, i.e. the results from M-x
> apropos it splits the frame in two windows vertically. Now, I
> generally prefer vertical splits

switch-to-buffer-other-window looks to me to be the most promising
place
for advise.  But a bug report might be a good path too.
switch-to-buffer-other-window calls pop-to-buffer which hard codes nil
as
the direction to split.

Fdisplay_buffer (buf, other_window, Qnil)

That hard coding could easily reference a variable whose default value
was nil, thus no impact to current users but it would allow anyone to
simply customize it to their liking.  I've got a cinematic monitor and
would prefer splits go the other way too.