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bug#32090: 26.1; connection-local-variables do not match as described

From: Christopher Cooper
Subject: bug#32090: 26.1; connection-local-variables do not match as described
Date: Sun, 8 Jul 2018 00:10:48 -0400

According to the docstring for 'connection-local-criteria-alist',
"CRITERIA is a plist identifying a connection and the application
using this connection. ... All properties are optional; if
CRITERIA is nil, it always applies."

This does not appear to be true. In fact, this is plainly evident by
simple visual inspection of 'connection-local-get-profiles'. Only
:application seems to be optional.

Reproduction is quite simple. Run emacs -Q and eval the following elisp:

(defvar test--var nil)
(setf enable-connection-local-variables t)
(connection-local-set-profile-variables 'test-profile '((test--var . t)))
(connection-local-set-profiles nil 'test-profile)

Now open any TRAMP connection. Switch to the TRAMP buffer (where
connection-local-variables should have taken effect) and do
M-: test--var. The result is nil.

If you conduct the same test, but specify the :protocol, :user, and
:machine as part of the criteria in the 'connection-local-set-profiles'
call, test--var will evaluate to t, which is correct.

At best this is a case of misleading documentation, and at worst it is a
feature that never got implemented. Connection-local variables would be
very useful to me if they worked as described. I am glad to provide more
info or help in any capacity.

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-07-05 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12000000
System -e Description:    Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Magit

Minor modes in effect:
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  erc-notify-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
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  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  global-magit-file-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
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  ido-vertical-mode: t
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  shell-dirtrack-mode: t
  recentf-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/cooperc/.emacs.d/elpa/git-commit-2.13.0/git-commit hides

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backquote dbusbind inotify lcms2 dynamic-setting system-font-setting
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