* lisp/wid-edit.el (widget-choose): Use display-buffer-in-direction

to display buffer in bottom direction with fit-window-to-buffer.

* lisp/proced.el (proced-with-processes-buffer): Idem.  (Bug#35592)

lisp/proced.el

@@ -1744,9 +1744,10 @@ The value returned is the value of the last form in BODY."
        (save-window-excursion
          ;; Analogous to `dired-pop-to-buffer'
          ;; Don't split window horizontally.  (Bug#1806)
-         (let (split-width-threshold)
-           (pop-to-buffer (current-buffer)))
-         (fit-window-to-buffer (get-buffer-window) nil 1)
+         (display-buffer (current-buffer)
+                         '(display-buffer-in-direction
+                           (direction . bottom)
+                           (window-height . fit-window-to-buffer)))
          ,@body))))
 
 (defun proced-send-signal (&optional signal process-alist)

lisp/wid-edit.el

@@ -252,7 +252,10 @@ minibuffer."
 	   (define-key map [?\M--] 'negative-argument)
 	   (save-window-excursion
 	     (let ((buf (get-buffer " widget-choose")))
-	       (fit-window-to-buffer (display-buffer buf))
+	       (display-buffer buf
+			       '(display-buffer-in-direction
+				 (direction . bottom)
+				 (window-height . fit-window-to-buffer)))
 	       (let ((cursor-in-echo-area t)
 		     (arg 1))
                  (while (not value)