* 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.

3 files changed, 34 insertions, 33 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 414eb3f93af..4b67b02c386 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3315,15 +3315,7 @@ n  -- to ignore the local variables list.")
 
       ;; Display the buffer and read a choice.
       (save-window-excursion
-	(pop-to-buffer buf `((display-buffer--maybe-same-window
-                              display-buffer-reuse-window
-                              display-buffer--maybe-pop-up-frame-or-window
-                              display-buffer-at-bottom)
-	                     ,(if temp-buffer-resize-mode
-		                  '(window-height . resize-temp-buffer-window)
-	                        '(window-height . fit-window-to-buffer))
-	                     ,(when temp-buffer-resize-mode
-	                        '(preserve-size . (nil . t)))))
+	(pop-to-buffer buf '(display-buffer--maybe-at-bottom))
 	(let* ((exit-chars '(?y ?n ?\s ?\C-g ?\C-v))
 	       (prompt (format "Please type %s%s: "
 			       (if offer-save "y, n, or !" "y or n")
@@ -6929,15 +6921,7 @@ if any returns nil.  If `confirm-kill-emacs' is non-nil, calls it."
            (or (not active)
                (with-displayed-buffer-window
                 (get-buffer-create "*Process List*")
-                `((display-buffer--maybe-same-window
-                   display-buffer-reuse-window
-                   display-buffer--maybe-pop-up-frame-or-window
-                   display-buffer-at-bottom)
-	          ,(if temp-buffer-resize-mode
-		       '(window-height . resize-temp-buffer-window)
-	             '(window-height . fit-window-to-buffer))
-	          ,(when temp-buffer-resize-mode
-	             '(preserve-size . (nil . t))))
+                '(display-buffer--maybe-at-bottom)
                 #'(lambda (window _value)
                     (with-selected-window window
                       (unwind-protect
diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index ef0d40790c5..e3ae2912a86 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -1824,12 +1824,7 @@ variables.")
              ;; window, mark it as softly-dedicated, so bury-buffer in
              ;; minibuffer-hide-completions will know whether to
              ;; delete the window or not.
-             (display-buffer-mark-dedicated 'soft)
-             ;; Disable `pop-up-windows' temporarily to allow
-             ;; `display-buffer--maybe-pop-up-frame-or-window'
-             ;; in the display actions below to pop up a frame
-             ;; if `pop-up-frames' is non-nil, but not to pop up a window.
-             (pop-up-windows nil))
+             (display-buffer-mark-dedicated 'soft))
         (with-displayed-buffer-window
           "*Completions*"
           ;; This is a copy of `display-buffer-fallback-action'
@@ -1837,7 +1832,7 @@ variables.")
           ;; with `display-buffer-at-bottom'.
           `((display-buffer--maybe-same-window
              display-buffer-reuse-window
-             display-buffer--maybe-pop-up-frame-or-window
+             display-buffer--maybe-pop-up-frame
              ;; Use `display-buffer-below-selected' for inline completions,
              ;; but not in the minibuffer (e.g. in `eval-expression')
              ;; for which `display-buffer-at-bottom' is used.
diff --git a/lisp/window.el b/lisp/window.el
index abd1a68b1f0..8c5e441e4b6 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -7289,12 +7289,23 @@ text-only terminal), try with `display-buffer-pop-up-frame'.
 
 If that cannot be done, and `pop-up-windows' is non-nil, try
 again with `display-buffer-pop-up-window'."
-  (or (and (if (eq pop-up-frames 'graphic-only)
-	       (display-graphic-p)
-	     pop-up-frames)
-	   (display-buffer-pop-up-frame buffer alist))
-      (and pop-up-windows
-	   (display-buffer-pop-up-window buffer alist))))
+  (or (display-buffer--maybe-pop-up-frame buffer alist)
+      (display-buffer--maybe-pop-up-window buffer alist)))
+
+(defun display-buffer--maybe-pop-up-frame (buffer alist)
+  "Try displaying BUFFER based on `pop-up-frames'.
+If `pop-up-frames' is non-nil (and not `graphic-only' on a
+text-only terminal), try with `display-buffer-pop-up-frame'."
+  (and (if (eq pop-up-frames 'graphic-only)
+	   (display-graphic-p)
+	 pop-up-frames)
+       (display-buffer-pop-up-frame buffer alist)))
+
+(defun display-buffer--maybe-pop-up-window (buffer alist)
+  "Try displaying BUFFER based on `pop-up-windows'.
+If `pop-up-windows' is non-nil, try with `display-buffer-pop-up-window'."
+  (and pop-up-windows
+       (display-buffer-pop-up-window buffer alist)))
 
 (defun display-buffer-in-child-frame (buffer alist)
   "Display BUFFER in a child frame.
@@ -7360,6 +7371,17 @@ below the selected one, use that window."
 	     (window--display-buffer
 	      buffer window 'reuse alist display-buffer-mark-dedicated)))))
 
+(defun display-buffer--maybe-at-bottom (buffer alist)
+  (let ((alist (append alist `(,(if temp-buffer-resize-mode
+		                    '(window-height . resize-temp-buffer-window)
+	                          '(window-height . fit-window-to-buffer))
+	                       ,(when temp-buffer-resize-mode
+	                          '(preserve-size . (nil . t)))))))
+    (or (display-buffer--maybe-same-window buffer alist)
+        (display-buffer-reuse-window buffer alist)
+        (display-buffer--maybe-pop-up-frame buffer alist)
+        (display-buffer-at-bottom buffer alist))))
+
 (defun display-buffer-at-bottom (buffer alist)
   "Try displaying BUFFER in a window at the bottom of the selected frame.
 This either reuses such a window provided it shows BUFFER
@@ -7376,8 +7398,8 @@ selected frame."
 	 (setq bottom-window-shows-buffer t)
 	 (setq bottom-window window))
 	((not bottom-window)
-	 (setq bottom-window window)))
-       nil nil 'nomini))
+	 (setq bottom-window window))))
+     nil nil 'nomini)
     (or (and bottom-window-shows-buffer
 	     (window--display-buffer
 	      buffer bottom-window 'reuse alist display-buffer-mark-dedicated))