Don't infinite loop in map-y-or-n-p if at the end of kmacro

Previously, if map-y-or-n-p got -1 from read-event (indicating no
input due to the end of a keyboard macro), it would just infinite
loop.

Now it behaves like other commands which use read-event/read-char/etc,
and just errors when we try to look up -1 in our keymap and find
nothing.

Also, just for the sake of users, print a slightly prettier message
when this happens.

* lisp/emacs-lisp/map-ynp.el (map-y-or-n-p): Don't loop if we reach
the end of a keyboard macro.  (Bug#67046)

1 files changed, 4 insertions, 6 deletions

diff --git a/lisp/emacs-lisp/map-ynp.el b/lisp/emacs-lisp/map-ynp.el
index cb1cc88e78f..fffb199e2ea 100644
--- a/lisp/emacs-lisp/map-ynp.el
+++ b/lisp/emacs-lisp/map-ynp.el
@@ -168,16 +168,14 @@ The function's value is the number of actions taken."
                                 (key-description (vector help-char)))
                        (if minibuffer-auto-raise
                            (raise-frame (window-frame (minibuffer-window))))
-                       (while (progn
-                                (setq char (read-event))
-                                ;; If we get -1, from end of keyboard
-                                ;; macro, try again.
-                                (equal char -1)))
+                       (setq char (read-event))
                        ;; Show the answer to the question.
                        (message "%s(y, n, !, ., q, %sor %s) %s"
                                 prompt user-keys
                                 (key-description (vector help-char))
-                                (single-key-description char)))
+                                (if (equal char -1)
+                                    "[end-of-keyboard-macro]"
+                                  (single-key-description char))))
                      (setq def (lookup-key map (vector char))))
                    (cond ((eq def 'exit)
                           (setq next (lambda () nil)))