bug#30016: Improve visibility of Process List

[Juri Linkov <juri@linkov.net>]

> Meanwhile I propose another improvement for *Process List* displayed
> on ‘C-x C-c’.  Currently it splits the frame side-by-side and displays
> the process list far away from the minibuffer containing the question
> “Active processes exist; kill them and exit anyway? (yes or no) ”
>
> This patch will display the buffer *Process List* near the minibuffer
> to allow easier inspection of the active processes and display the
> process list with the full frame width that will help to also see
> usually long command lines in their entirety:

Actually the same would be useful for *Local Variables* as well:

diff --git a/lisp/files.el b/lisp/files.el
index 5b8dff7..7194b56 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3315,7 +3315,15 @@ hack-local-variables-confirm
 
       ;; Display the buffer and read a choice.
       (save-window-excursion
-	(pop-to-buffer buf)
+	(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)))))
 	(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")
@@ -6917,8 +6925,17 @@ save-buffers-kill-emacs
                   (setq active t))
              (setq processes (cdr processes)))
            (or (not active)
-               (with-current-buffer-window
-                (get-buffer-create "*Process List*") nil
+               (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))))
                 #'(lambda (window _value)
                     (with-selected-window window
                       (unwind-protect