bug#47753: 27.2; emacs menus don't drop down (macos 10.11.6)

[Artemio González López]

I'm using Emacs 27.2 on an old iMac running macos 10.11.6 (aka El
Capitan). Starting (I think) with version 27, Emacs's menus displayed in
the menubar on top of the screen (File, Edit, Options, Buffers, Tools,
etc. on macos) don't drop down when you click on them (the menu name
gets highlited, but nothing drop down under it, so it's unusable).
The only exception to this behavior is the Emacs
menu (I think this is a specific macos menu) drops down properly when clicke 
upon.


In GNU Emacs 27.2 (build 1, x86_64-apple-darwin15.6.0, NS appkit-1404.47 
Version 10.11.6 (Build 15G22010))
of 2021-03-26 built on elcapitan.internal.macports.net
Windowing system distributor 'Apple', version 10.3.1404
System Description:  Mac OS X 10.11.6

Recent messages:
Loading delsel...done
Loading paren...done
Loading /Users/artemio/.session...done
For information about GNU Emacs and the GNU system, type C-h C-a.
ESC M-b is undefined

Configured using:
'configure --prefix=/opt/local --disable-silent-rules --without-dbus
--without-gconf --without-libotf --without-m17n-flt --with-gmp
--with-gnutls --with-json --with-xml2 --with-modules --infodir
/opt/local/share/info/emacs --with-ns --with-lcms2 --without-harfbuzz
--without-imagemagick --without-xaw3d --with-rsvg 'CFLAGS=-pipe -Os
-arch x86_64' CPPFLAGS=-I/opt/local/include 'LDFLAGS=-L/opt/local/lib
-Wl,-headerpad_max_install_names -Wl,-no_pie -arch x86_64''

Configured features:
RSVG GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS XIM
NS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_ES.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  show-paren-mode: t
  delete-selection-mode: t
  tabbar-mwheel-mode: t
  tabbar-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
format-spec rfc822 mml mml-sec epa derived epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils paren delsel
cus-start cus-load edmacro kmacro tabbar easy-mmode session
exec-path-from-shell finder-inf server info tex-site package easymenu
browse-url url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache json subr-x map url-vars seq
byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/ns-win
ns-win ucs-normalize mule-util term/common-win tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-mode
elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads kqueue cocoa ns
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 83612 10586)
(symbols 48 9634 1)
(strings 32 26505 1240)
(string-bytes 1 858209)
(vectors 16 13710)
(vector-slots 8 174203 14428)
(floats 8 40 25)
(intervals 56 402 0)
(buffers 1000 12))