* lisp/window.el (display-buffer--maybe-at-bottom): New function (bug#30314).

* lisp/window.el (display-buffer--maybe-at-bottom): New function (bug#30314).

(display-buffer--maybe-pop-up-frame)
(display-buffer--maybe-pop-up-window): New functions created from
display-buffer--maybe-pop-up-frame-or-window.
(display-buffer--maybe-pop-up-frame-or-window): Call
display-buffer--maybe-pop-up-frame or
display-buffer--maybe-pop-up-window.
(display-buffer-at-bottom): Fix parens.

* lisp/minibuffer.el (minibuffer-completion-help): Use
display-buffer--maybe-pop-up-frame instead of let-binding
pop-up-windows to nil.

* lisp/files.el (hack-local-variables-confirm)
(save-buffers-kill-emacs): Use display-buffer--maybe-at-bottom.