bug#28697: 25.3; eldoc changes mode-line settings

[Nick Helm]

I've encountered a minor annoyance with eldoc-mode and its use of the
mode-line.

I like to run Emacs with the mode-line turned off. When I evaluate an
expression interactively, eldoc restores the mode-line without being
asked and doesn't turn it off again when it's finished.

Recipe:

  Emacs -Q
  (setq-default mode-line-format nil)
  mode-line-format -> nil
  M-: (+ 1     ;open an eval, the mode-line reappears with eldoc message
  ) RET        ;complete the eval, a blank mode-line remains
  mode-line-format -> ("" (eldoc-mode-line-string (" " eldoc...

I expect eldoc to respect my value of mode-line-format, or at least
restore the orignal value when it finishes doing its thing.

I had a look at eldoc.el and I think the problem lies in
eldoc-minibuffer-message. The function uses listp to test for
mode-line-format, forgetting (I assume!) that nil is also a valid list.

The following tweak seems to fix the problem here:

--- a/lisp/emacs-lisp/eldoc.el  2017-10-04 15:17:48.000000000 +1300
+++ b/lisp/emacs-lisp/eldoc.el  2017-10-04 12:17:36.000000000 +1300
@@ -261,8 +261,8 @@
             (or (window-in-direction 'above (minibuffer-window))
                 (minibuffer-selected-window)
                 (get-largest-window)))
-         (unless (and (listp mode-line-format)
-                      (assq 'eldoc-mode-line-string mode-line-format))
+         (when (and mode-line-format
+                         (not (assq 'eldoc-mode-line-string mode-line-format)))
            (setq mode-line-format
                  (list "" '(eldoc-mode-line-string
                             (" " eldoc-mode-line-string " "))

For cases where mode-line-format is non-nil, eldoc also leaves behind a
buffer local value, rather than restoring the default (if there was
one), but I guess that's a different issue.




In GNU Emacs 25.3.3 (x86_64-apple-darwin16.7.0, Carbon Version 157 AppKit 
1504.83)
 of 2017-09-28 built on oberon
Windowing system distributor 'Apple Inc.', version 10.12.6
Configured using:
 'configure --with-mac
 
--enable-locallisppath=/usr/local/kemp-emacs/emacs-25.3-mac-6.8/share/emacs/site-lisp
 --infodir=/usr/local/kemp-emacs/emacs-25.3-mac-6.8/info/emacs
 --prefix=/usr/local/kemp-emacs/emacs-25.3-mac-6.8
 --enable-mac-app=/usr/local/kemp-emacs/emacs-25.3-mac-6.8'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS

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

Major mode: Text

Minor modes in effect:
  savehist-mode: t
  global-eldoc-mode: t
  mac-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
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
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/Users/nick/.emacs.d/lisp/org-9.1.1/ob-calc hides 
/usr/local/kemp-emacs/emacs-25.3-mac-6.8/share/emacs/25.3/lisp/org/ob-calc
/Users/nick/.emacs.d/lisp/org-9.1.1/ob-C hides 
/usr/local/kemp-emacs/emacs-25.3-mac-6.8/share/emacs/25.3/lisp/org/ob-C
/Users/nick/.emacs.d/lisp/org-9.1.1/ob-awk hides 
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/Users/nick/.emacs.d/lisp/auth-26.1/auth-source hides 
/usr/local/kemp-emacs/emacs-25.3-mac-6.8/share/emacs/25.3/lisp/gnus/auth-source

Features:
(shadow gnus-cite sort mail-extr nnir emacsbug sendmail nndraft nnmh
utf-7 network-stream nsm auth-source cl-seq eieio byte-opt bytecomp
byte-compile cl-extra cconv eieio-core cl-macs starttls nnnil gnus-agent
gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu
mml2015 mm-view mml-smime smime dig mailcap nntp gnus-cache gnus-sum
gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls
gnutls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range message
format-spec rfc822 mml mml-sec password-cache epg epg-config mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems nnheader
gnus-util mail-utils mm-util help-fns help-mode mail-prsvr wid-edit
jka-compr info time dired-x easymenu dired savehist nh-macdict
easy-mmode iso-transl edmacro kmacro cl-loaddefs pcase cl-lib gv
plain-theme mule-util time-date tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel mac-win term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame 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 charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
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 kqueue mac multi-tty
make-network-process emacs)

Memory information:
((conses 16 179241 9128)
 (symbols 48 29035 0)
 (miscs 40 87 98)
 (strings 32 47808 8612)
 (string-bytes 1 1681385)
 (vectors 16 21552)
 (vector-slots 8 569218 3611)
 (floats 8 378 384)
 (intervals 56 262 0)
 (buffers 976 23))