bug#20481: 24.5; Newlines in message-box output don't work on Windows

bug#20481: 24.5; Newlines in message-box output don't work on Windows

[Adam Connor]

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If I display a message using message-box, newlines seem to be ignored.
For example
    (message-box "secret\nmessage")

will show the message "secretmessage". I have also tried \r\n with the
same result.

Not a huge problem but annoying...



In GNU Emacs 24.5.1 (x86_64-w64-mingw32)
 of 2015-04-11 on KAEL
Windowing system distributor `Microsoft Corp.', version 6.3.9600
Configured using:
 `configure --prefix=/z/emacs --host=x86_64-w64-mingw32
 --target=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --with-wide-int
 --with-jpeg --with-xpm --with-png --with-tiff --with-rsvg --with-xml2
 --with-gnutls --with-sound=yes --with-file-notification=yes
 --without-dbus --without-imagemagick 'CFLAGS=-Ofast
 -fomit-frame-pointer -funroll-loops -g0 -pipe' 'LDFLAGS=-static-libgcc
 -static-libstdc++ -static -s -Wl,-s''

Important settings:
  value of $LANG: ENU
  locale-coding-system: utf-8

Major mode: Emacs-Lisp

Minor modes in effect:
  my-keys-minor-mode: t
  tabbar-mwheel-mode: t
  tabbar-mode: t
  global-nlinum-mode: t
  nlinum-mode: t
  diff-auto-refine-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  recentf-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Auto-saving...
Quit
Saving file c:/Users/Adam/.emacs.d/elisp/file-utils.el...
Wrote c:/Users/Adam/.emacs.d/elisp/file-utils.el
file-older-than
Quit
Saving file c:/Users/Adam/.emacs.d/elisp/file-utils.el...
Wrote c:/Users/Adam/.emacs.d/elisp/file-utils.el
file-older-than
Wrote c:/Users/Adam/.emacs.d/packages-updated.txt
nil

Load-path shadows:
~/.emacs.d/lib/tabbar-master/revive hides ~/.emacs.d/lib/revive
c:/Users/Adam/.emacs.d/elpa/dash-2.10.0/dash hides ~/.emacs.d/lib/dash
~/.emacs.d/lib/indent hides
c:/dev/emacs-w64-24.5/share/emacs/24.5/lisp/indent

Features:
(shadow sort mail-extr emacsbug sendmail debug eieio-opt speedbar
sb-image ezimage dframe find-func geiser-mode geiser-xref geiser-chicken
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geiser-connection tq geiser-syntax rx geiser-log geiser-popup view
geiser-impl geiser-custom geiser-base tar-mode thingatpt cmuscheme
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mule-util gnutls mm-archive network-stream starttls url-cache
url-handlers finder-inf vc-git tabbar revbufs fill-column-indicator
nlinum linum virtualenvwrapper dash vc-svn psvn derived log-edit message
format-spec rfc822 mml mml-sec mailabbrev mail-utils gmm-utils
mailheader pcvs-util add-log diff-mode pp elp ediff-merg ediff-wind
ediff-diff ediff-mult ediff-help ediff-init ediff-util dired rdp-utils
web-mode flymake compile python json comint ring ansi-color util
undo-tree soap-client mm-decode mm-bodies mm-encode url-http tls
url-auth mail-parse rfc2231 rfc2047 rfc2045 ietf-drums url-gw url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util url-parse auth-source eieio byte-opt bytecomp
byte-compile cl-extra cconv eieio-core gnus-util mm-util mail-prsvr
password-cache url-vars mailcap warnings xml easy-mmode virtualenv-utils
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electric uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
w32notify w32 multi-tty emacs)

Memory information:
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bug#20481: 24.5; Newlines in message-box output don't work on Windows

[Eli Zaretskii]

> From: Adam Connor <adamc55@gmail.com>
> Date: Thu, 30 Apr 2015 22:18:13 -0500
> 
> If I display a message using message-box, newlines seem to be ignored.
> For example
> (message-box "secret\nmessage")
> 
> will show the message "secretmessage". I have also tried \r\n with the
> same result.
> 
> Not a huge problem but annoying...

Emacs on Windows doesn't really support message boxes (a.k.a. "dialog
boxes"), except for simple Yes/No questions popped up by yes-or-no-p.
For other messages, such as this one, Emacs on Windows emulates dialog
boxes by menus, and in a menu an item cannot contain a newline.

In this case, we faithfully pass the original string with a newline to
the MS-Windows menu API, and I believe it is dropped by Windows when
it displays the menu.

IOW, this is a missing feature: dialog boxes are not fully supported
on MS-Windows.

bug#20481: 24.5; Newlines in message-box output don't work on Windows

[Eli Zaretskii]

> From: Adam Connor <adamc55@gmail.com>
> Date: Fri, 1 May 2015 15:22:29 -0500
> 
> Thanks for explaining. That's unfortunate.

Patches to have Emacs on Windows support dialog boxes are welcome.
There's already code there, currently ifdef'ed away, which is
incomplete and "needs work".