Unable to scroll from y-or-n-p prompt

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

Hi,
I think I have reported this in the past, and it seem not fixed.
This patch fix it, please review.

--8<---------------cut here---------------start------------->8---
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2339,7 +2339,8 @@
                   (let ((cursor-in-echo-area t))
                     (when minibuffer-auto-raise
                       (raise-frame (window-frame (minibuffer-window))))
-                    (read-key (propertize (if (eq answer 'recenter)
+                    (read-key (propertize (if (or (eq answer 'recenter)
+                                                  (eq answer 'scroll))
                                               prompt
                                             (concat "Please answer y or n.  "
                                                     prompt))
@@ -2349,6 +2350,12 @@
              ((memq answer '(skip act)) nil)
              ((eq answer 'recenter) (recenter) t)
              ((memq answer '(exit-prefix quit)) (signal 'quit nil) t)
+             ((eq key ?\C-v)
+              (setq answer 'scroll)
+              (condition-case nil (scroll-up 1) (error nil)) t)
+             ((eq key ?\M-v)
+              (setq answer 'scroll)
+              (condition-case nil (scroll-down 1) (error nil)) t)
              (t t)))
         (ding)
         (discard-input))))
--8<---------------cut here---------------end--------------->8---

Thanks.

-- 
  Thierry
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