emacs helm: open completion in bottom buffer window

keywords: emacs helm two buffers open bottom buffer

Solution: https://github.com/emacs-helm/helm/issues/2039#issuecomment-390103697

(setq helm-always-two-windows nil)
(setq helm-display-buffer-default-height 23)
(setq helm-default-display-buffer-functions '(display-buffer-in-side-window))