bug#39389: 27.0.60; A couple of bugs messing with minibuffer completion of /sudo::

[Jimmy Yuen Ho Wong <wyuenho@gmail.com>]

Bug 1:

If `ido-enable-tramp-completion` is set to `nil`, it's impossible to
open a file as root with `ido-find-file`. Here are the reproduction steps:

1. In Terminal, $ /Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs -Q

2. M-x ido-mode

3. M-x set-variable ido-enable-tramp-completion RET nil RET

4. C-x C-f //sudo:

5. Minibuffer prompt will show `File file: /sudo:/ [No match]` and
there's no way to remove the auto completed / in the end.


Bug 2:

1. $ echo 'PATH=".:$PATH"' > .bash_profile

2. $ echo '(require
'exec-path-from-shell)(exec-path-from-shell-initialize)' > .emacs

3. Launch /Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs in GUI

4. C-x C-f /sudo:: RET

5. Cursor now stops blinking but no password prompt is shown.

6. If you TAB complete after /sudo: but before the final :, prompt will
not be stuck


This bug can only be reproduced if steps 1-3 are followed exactly. The
following examples can't reproduce this problem:

* $ /Application/MacPorts/Emacs.app/Contents/MacOS/Emacs -Q -l tramp -l
/path/to/exec-path-from-shell --eval '(exec-path-from-shell-initialize)'
/sudo::

* $ echo '(set exec-path (cons "." exec-path))' > .emacs;
/Applications/MacPorts/Emacs.app/Contents/MacOS/Emacs

There's some very weird interactions with how Emacs starts up, what
happens to Emacs after `call-process` on SHELL  and setting `exec-path`,
and tab completion of /sudo:: in the minibuffer. This appears to have
been the case since relatively early versions of Emacs 27.

Bug 2.1:

If `auth-sources` is set to `'("~/.authinfo.gpg")` and `~/.authinfo.gpg`
has saved the credentials of localhost or the machine's host name, bug 2
does not happened.


Bug 3:

1. Same as Bug 2

2. $ echo '(require
'exec-path-from-shell)(exec-path-from-shell-initialize)(require 'crux)'
> .emacs

3. Same as Bug 2

4. Same as Bug 2

5. M-x crux-sudo-edit

6. Minibuffer now stuck at "Tramp: Sending Password"

Possibly due to similar reasons as Bug 2.

\f

In GNU Emacs 27.0.60 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G2022))
 of 2020-02-02 built on MobileCat.local
Repository revision: f27187f963e9e36435b508e29256e048799e0ff2
Repository branch: HEAD
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Recent messages:

Tramp: Checking ‘vc-registered’ for /sudo:root@localhost:/Users/wyuenho/.emacs...done
Tramp: Inserting ‘/sudo:root@localhost:/Users/wyuenho/.emacs’...done

Tramp: Checking ‘vc-registered’ for /sudo:root@localhost:/Users/wyuenho/Documents/workspace/dotfiles/.emacs...done
Tramp: Inserting ‘/sudo:root@localhost:/Users/wyuenho/.emacs’...done
Warning: symbolic link to Git-controlled source file
You can run the command ‘crux-sudo-edit’ with C-c C-u
Warning: symbolic link to Git-controlled source file
A-b is undefined [2 times]

Configured using:
 'configure --prefix=/opt/local --without-dbus --without-gconf
 --without-libotf --without-m17n-flt --without-gpm --with-gnutls
 --with-xml2 --with-modules --infodir /opt/local/share/info/emacs
 --with-json --without-harfbuzz --with-ns --with-lcms2
 --with-imagemagick --with-rsvg 'CFLAGS=-pipe -Os
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -arch
 x86_64' 'CPPFLAGS=-I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk'
 'LDFLAGS=-L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-no_pie
 -Wl,-syslibroot,/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
 -arch x86_64''

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

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

Major mode: 

Minor modes in effect:
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  which-key-mode: t
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  show-smartparens-global-mode: t
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  rxt-global-mode: t
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  recentf-mode: t
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  global-move-dup-mode: t
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  global-magit-file-mode: t
  which-function-mode: t
  magit-auto-revert-mode: t
  global-auto-revert-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  global-hl-line-mode: t
  global-flycheck-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  flx-ido-mode: t
  ido-everywhere: t
  editorconfig-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  company-statistics-mode: t
  global-company-mode: t
  company-mode: t
  beginend-global-mode: t
  beginend-prog-mode: t
  auto-compile-on-save-mode: t
  auto-compile-mode: t
  async-bytecomp-package-mode: t
  amx-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  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
  temp-buffer-resize-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Load-path shadows:
/opt/local/share/emacs/site-lisp/cmake-mode hides /Users/wyuenho/.emacs.d/elpa/cmake-mode-20190710.1319/cmake-mode

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