"If there's only one window (excluding any possibly active
minibuffer), then split the current window horizontally."
(if (and (one-window-p t)
(not (active-minibuffer-window))
"If there's only one window (excluding any possibly active
minibuffer), then split the current window horizontally."
(if (and (one-window-p t)
(not (active-minibuffer-window))