GNU logs - #20766, boring messages

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Subject: bug#20766: 24.5; disable-theme leaves lingering effects
Resent-From: Anders Papitto <anderspapitto@HIDDEN>
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From: Anders Papitto <anderspapitto@HIDDEN>
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When I run these commands from a fresh Emacs instance

M-x load-theme RET solarized-light RET
M-x disable-theme RET solarized-light RET
M-x term RET RET

the text background color in term-mode stays what it was set to by the
solarized-light theme. A very similar invocation does not have this
behavior:

M-x term RET RET
C-c k RET yes RET
M-x load-theme RET solarized-light RET
M-x disable-theme RET solarized-light RET
M-x term RET RET

i.e. If term mode gets to run before loading the theme, no bug.

the 'solarized-light' theme was installed from melpa via M-x
package-list-packages, and is upstream at
https://github.com/bbatsov/solarized-emacs. I'm not certain whether the
behavior is specific to that theme or not.

What I have observed is that there seems to be an interaction with the
variables term-default-fg-color and term-default-bg-color. They start as
:not-bound. Solarized light sets them to some value when loaded, and
resets them to :not-bound when unloaded. However, term mode also sets
them when started (both to 'nil) and seems to never reset them to
:not-bound.

Note: I don't have Emacs configured to send email, so I copied the
following from the bug-submission utility.


In GNU Emacs 24.5.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.27)
 of 2015-05-13 on localhost
Windowing system distributor `The X.Org Foundation', version 11.0.11604000
Configured using:
 `configure --disable-dependency-tracking
 --prefix=/nix/store/wjlxah8xdid8qw12rsf3cjxvqj3zw69p-emacs-24.5
 --with-x-toolkit=gtk2 --with-xft'

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-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
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
delete-backward-char: Text is read-only

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils time-date tooltip electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer 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 make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 71068 7059)
 (symbols 48 17455 0)
 (miscs 40 39 163)
 (strings 32 9117 4368)
 (string-bytes 1 264156)
 (vectors 16 8912)
 (vector-slots 8 383152 18293)
 (floats 8 63 249)
 (intervals 56 166 16)
 (buffers 960 11)
 (heap 1024 12859 662))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Anders Papitto <anderspapitto@HIDDEN>
Subject: bug#20766: Acknowledgement (24.5; disable-theme leaves lingering
 effects)
Message-ID: <handler.20766.B.143372640727262.ack <at> debbugs.gnu.org>
References: <CAD1XNaoXi6YZf2LADD+xOODFDvJHCMGF+HT8z58pnW1xtLH=Rw@HIDDEN>
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Date: Mon, 08 Jun 2015 01:21:03 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#20766: 24.5; disable-theme leaves lingering effects
References: <CAD1XNaoXi6YZf2LADD+xOODFDvJHCMGF+HT8z58pnW1xtLH=Rw@HIDDEN>
In-Reply-To: <CAD1XNaoXi6YZf2LADD+xOODFDvJHCMGF+HT8z58pnW1xtLH=Rw@HIDDEN>
Resent-From: Mauro Aranda <maurooaranda@HIDDEN>
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To: Anders Papitto <anderspapitto@HIDDEN>
Cc: 20766 <at> debbugs.gnu.org
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From: Mauro Aranda <maurooaranda@HIDDEN>
Date: Fri, 6 Nov 2020 09:26:36 -0300
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--0000000000009899f905b36f5309
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Anders Papitto <anderspapitto@HIDDEN> writes:

> When I run these commands from a fresh Emacs instance
>
> M-x load-theme RET solarized-light RET
> M-x disable-theme RET solarized-light RET
> M-x term RET RET
>
> the text background color in term-mode stays what it was set to by the
> solarized-light theme. A very similar invocation does not have this
> behavior:
>
> M-x term RET RET
> C-c k RET yes RET
> M-x load-theme RET solarized-light RET
> M-x disable-theme RET solarized-light RET
> M-x term RET RET
>
> i.e. If term mode gets to run before loading the theme, no bug.
>

This bug is still present.

It looks like solarized still sets the obsoleted variables
term-default-fg-color and term-default-bg-color, but still, the bug is
in custom.el and it's related to Bug#21355.

Here's a recipe:
Save this theme into test-bug20766-theme.el, and arrange to load it.
(deftheme test-bug20766)

(custom-theme-set-variables
 'test-bug20766
 '(test-option 'foo))

(provide-theme 'test-bug20766)

emacs -Q

M-x load-theme RET test-bug20766
test-option is not yet known, so custom stores the theme setting under
the saved-value property of test-option.

M-x disable-theme RET test-bug20766
The saved-value property should be nil, because the theme setting is no
longer relevant.  However, it's still ('foo).

Then eval the following defcustom:
(defcustom test-option 'bar "..."
:type 'symbol
:group 'emacs)

M-: test-option ==> foo, which is wrong.

In the original recipe, that is how term-default-fg-color and
term-default-bg-color get the solarized theme setting after loading
term.

--0000000000009899f905b36f5309
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Anders Papitto &lt;<a href=3D"mailto:anderspapitto@HIDDEN=
om">anderspapitto@HIDDEN</a>&gt; writes:<br><br>&gt; When I run these co=
mmands from a fresh Emacs instance<br>&gt;<br>&gt; M-x load-theme RET solar=
ized-light RET<br>&gt; M-x disable-theme RET solarized-light RET<br>&gt; M-=
x term RET RET<br>&gt;<br>&gt; the text background color in term-mode stays=
 what it was set to by the<br>&gt; solarized-light theme. A very similar in=
vocation does not have this<br>&gt; behavior:<br>&gt;<br>&gt; M-x term RET =
RET<br>&gt; C-c k RET yes RET<br>&gt; M-x load-theme RET solarized-light RE=
T<br>&gt; M-x disable-theme RET solarized-light RET<br>&gt; M-x term RET RE=
T<br>&gt;<br>&gt; i.e. If term mode gets to run before loading the theme, n=
o bug.<br>&gt;<br><br>This bug is still present.<br><br>It looks like solar=
ized still sets the obsoleted variables<br>term-default-fg-color and term-d=
efault-bg-color, but still, the bug is<br>in custom.el and it&#39;s related=
 to Bug#21355.<br><br>Here&#39;s a recipe:<br>Save this theme into test-bug=
20766-theme.el, and arrange to load it.<br>(deftheme test-bug20766)<br><br>=
(custom-theme-set-variables<br>=C2=A0&#39;test-bug20766<br>=C2=A0&#39;(test=
-option &#39;foo))<br><br>(provide-theme &#39;test-bug20766)<br><br>emacs -=
Q<br><br>M-x load-theme RET test-bug20766<br>test-option is not yet known, =
so custom stores the theme setting under<br>the saved-value property of tes=
t-option.<br><br>M-x disable-theme RET test-bug20766<br>The saved-value pro=
perty should be nil, because the theme setting is no<br>longer relevant.=C2=
=A0 However, it&#39;s still (&#39;foo).<br><br>Then eval the following defc=
ustom:<br>(defcustom test-option &#39;bar &quot;...&quot;<br>	 :type &#39;s=
ymbol<br>	 :group &#39;emacs)<br><br>M-: test-option =3D=3D&gt; foo, which =
is wrong.<br><br>In the original recipe, that is how term-default-fg-color =
and<br>term-default-bg-color get the solarized theme setting after loading<=
br>term.<br></div>

--0000000000009899f905b36f5309--

Last modified: Fri, 6 Nov 2020 12:30:02 UTC

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