bug#38031: 26.3; Trying to invoke the macOS File Open window causes Emacs to crash on macOS Catalina

[Michael Dixon]

On macOS Catalina, if I attempt to open a file using
  * File > Open
  * The toolbar button
  * "Open a File" on the splash screen

Emacs crashes. I am using the Homebrew formula with GUI. I have tried
with other Mac Emacs distributions, such as GNU Emacs for Mac OS X and
the Homebrew emacs-plus formula with the same result.

Here's the part of the macOS crash report that I think is useful:

Application Specific Information:
*** Terminating app due to uncaught exception 'NSObjectNotAvailableException',
reason: 'EmacsSavePanel is not a supported subclass for sandboxing'
abort() called
terminating with uncaught exception of type NSException

From my own troubleshooting, this appears to be due to a change in the
way macOS Catalina allows access to the Disk. Suggestions to fix it
include using macOS's System > Security & Privacy > Privacy > Full Disk
Access to grant full disk access to the Emacs application, the Emacs
binary within the Emacs.app and /usr/bin/ruby. None of these fix the problem 
for me.

I wonder if there is another executable that also needs full disk access
to make these elements work.


In GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.2.0, NS appkit-1671.20 
Version 10.14.3 (Build 18D109))
of 2019-09-02 built on builder10-14.porkrind.org
Windowing system distributor 'Apple', version 10.3.1894
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Starting new Ispell process /usr/local/bin/aspell with default dictionary...
evil-line-move: Beginning of buffer
Configured using:
'configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES THREADS

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

Major mode: Org

Minor modes in effect:
  wc-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  flyspell-mode: t
  shell-dirtrack-mode: t
  evil-mode: t
  evil-local-mode: t
  tooltip-mode: t
  global-eldoc-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
  visual-line-mode: t
  transient-mark-mode: t
  abbrev-mode: t

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Features:
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challenger-deep-theme finder-inf info package easymenu epg-config
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eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib time-date 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 menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
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hebrew greek romanian slovak czech european ethiopic indian cyrillic
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help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
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base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads kqueue cocoa ns multi-tty make-network-process emacs)

Memory information:
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