bug#67046: 29.1.50; map-y-or-n-p infinite loops if it's at the end of a kmacro

[Spencer Baugh]

For example, if you record a kmacro which does C-x s, then when you
repeat the kmacro and there are more buffers which could be saved, the
kmacro will hang instead of either completing or erroring.

Straightforward minimal reproduction:

(execute-kbd-macro (kbd "M-: (map-y-or-n-p SPC \"\" SPC #'ignore SPC '(1)) 
RET"))

This hangs in a loop around read-event and has to be interrupted with C-g.
The loop in question in map-y-or-n-p:

(while (progn
        (setq char (read-event))
        ;; If we get -1, from end of keyboard
        ;; macro, try again.
          (equal char -1)))

I'll fix this in a followup patch.


In GNU Emacs 29.1.50 (build 15, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-10-25 built on

Repository revision: 5cbca757f620c7b4ca31776711a247b8f266c36e
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Rocky Linux 8.8 (Green Obsidian)

Configured using:
 'configure --config-cache --with-x-toolkit=lucid
 --with-gif=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
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XINPUT2 XPM LUCID ZLIB

Important settings:
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Memory information:
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