GNU bug report logs - #16874
24.3.50; Regression in active window detection

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Damien Cassou <damien.cassou <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Regression in active window detection
Date: Tue, 25 Feb 2014 10:06:49 +0100

The following piece of code, from the milkypostman/powerline github
repository, used to detect if the current window is active or not:

    (defun powerline-selected-window-active ()
      "Return whether the current window is active."
      (or (eq (frame-selected-window)
              (selected-window))
          (and (minibuffer-window-active-p
                (frame-selected-window))
               (eq (pl/minibuffer-selected-window)
                   (selected-window)))))

This works fine in released Emacs 24 but does not work anymore in
emacs-snapshot (see below for details about the version I used to test).
Is this an Emacs regression or a problem in the implementation of this
function that is revealed by some recent changes in Emacs?


More about this issue: https://github.com/milkypostman/powerline/issues/37

In GNU Emacs 24.3.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.8.6)
 of 2014-02-23 on peryton
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description:	Ubuntu 13.10

Configured using:
 `configure --build=x86_64-linux-gnu --prefix=/usr
 '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
 '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
 '--libdir=${prefix}/lib/x86_64-linux-gnu'
 '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
 --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
 --program-suffix=-snapshot --with-x=yes --with-x-toolkit=gtk3
 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat
 -Werror=format-security' CPPFLAGS=-D_FORTIFY_SOURCE=2
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

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

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-switcher-mode: t
  diff-auto-refine-mode: t
  auto-revert-mode: t
  outline-minor-mode: t
  shell-dirtrack-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  ido-ubiquitous-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  global-smart-tab-mode: t
  smart-tab-mode: t
  eldoc-mode: t
  paredit-mode: t
  ido-vertical-mode: t
  global-discover-mode: t
  discover-mode: t
  projectile-global-mode: t
  projectile-mode: t
  guide-key-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-ethan-wspace-mode: t
  ethan-wspace-mode: t
  ethan-wspace-clean-many-nls-eof-mode: t
  ethan-wspace-clean-no-nl-eof-mode: t
  ethan-wspace-clean-eol-mode: t
  ethan-wspace-highlight-tabs-mode: t
  drag-stuff-global-mode: t
  drag-stuff-mode: t
  override-global-mode: t
  winner-mode: t
  show-paren-mode: t
  recentf-mode: t
  ido-everywhere: t
  icomplete-mode: t
  global-hl-line-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-f C-f C-f C-k f l y c k <backspace> h e c k SPC m 
u s t SPC u s e SPC C a s k SPC w h e n SPC p r e s 
e n t SPC f o r SPC d e p e n d e n c i e s C-x C-s 
M-b M-b M-b M-b M-b M-b <M-backspace> <M-backspace> 
C-x C-s C-M-' c a s k <return> C-x b i n i t <return> 
M-i f l y c h <return> C-n C-n C-e C-b <return> <tab> 
: c o n f i g <return> <tab> ( p r o g n <return> <tab> 
( a d d - h o o <tab> C-a C-o <tab> ( u s e - p a c 
<tab> SPC f l y c h e c k - c a s k C-n C-a <tab> C-n 
C-M-k C-p C-e M-j C-b <return> <tab> : c o n f i g 
<return> ( p r o g n <return> <tab> ( a d d - h o o 
k SPC ' f l y c h e c k - m o <tab> - h o o k C-h v 
C-g M-x f l y c <return> M-x <return> C-h v C-g SPC 
# ' f l y c h <tab> - c a s k - s e t u p <M-backspace> 
<backspace> <backspace> <backspace> s <tab> C-h f C-g 
C-h v C-g - s e t u p C-x C-s M-< C-M-f C-M-f C-M-f 
C-M-f C-M-f C-' e x i t <return> C-x C-e C-l C-u C-SPC 
C-u C-g C-e C-x C-e C-b C-x C-e C-b C-x C-e C-e <down-mouse-1> 
<mouse-1> M-x r e p o r t - e m a <return>

Recent messages:
t
Quit
Configuring package flycheck...
Loading package flycheck-cask...done
Configuring package flycheck...done
t
Loading package flycheck-cask...done
t
Loading package flycheck-cask...done
t

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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ox hides /usr/share/emacs/24.3.50/lisp/org/ox
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-css hides /usr/share/emacs/24.3.50/lisp/org/ob-css
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-table hides /usr/share/emacs/24.3.50/lisp/org/org-table
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-ledger hides /usr/share/emacs/24.3.50/lisp/org/ob-ledger
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-indent hides /usr/share/emacs/24.3.50/lisp/org/org-indent
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-footnote hides /usr/share/emacs/24.3.50/lisp/org/org-footnote
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-protocol hides /usr/share/emacs/24.3.50/lisp/org/org-protocol
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-capture hides /usr/share/emacs/24.3.50/lisp/org/org-capture
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-rmail hides /usr/share/emacs/24.3.50/lisp/org/org-rmail
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-w3m hides /usr/share/emacs/24.3.50/lisp/org/org-w3m
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-mobile hides /usr/share/emacs/24.3.50/lisp/org/org-mobile
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ox-ascii hides /usr/share/emacs/24.3.50/lisp/org/ox-ascii
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-inlinetask hides /usr/share/emacs/24.3.50/lisp/org/org-inlinetask
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ox-texinfo hides /usr/share/emacs/24.3.50/lisp/org/ox-texinfo
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-pcomplete hides /usr/share/emacs/24.3.50/lisp/org/org-pcomplete
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-colview hides /usr/share/emacs/24.3.50/lisp/org/org-colview
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-awk hides /usr/share/emacs/24.3.50/lisp/org/ob-awk
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-shen hides /usr/share/emacs/24.3.50/lisp/org/ob-shen
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-docview hides /usr/share/emacs/24.3.50/lisp/org/org-docview
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-sass hides /usr/share/emacs/24.3.50/lisp/org/ob-sass
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-agenda hides /usr/share/emacs/24.3.50/lisp/org/org-agenda
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-lob hides /usr/share/emacs/24.3.50/lisp/org/ob-lob
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-macro hides /usr/share/emacs/24.3.50/lisp/org/org-macro
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-mscgen hides /usr/share/emacs/24.3.50/lisp/org/ob-mscgen
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-picolisp hides /usr/share/emacs/24.3.50/lisp/org/ob-picolisp
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-io hides /usr/share/emacs/24.3.50/lisp/org/ob-io
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-dot hides /usr/share/emacs/24.3.50/lisp/org/ob-dot
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-exp hides /usr/share/emacs/24.3.50/lisp/org/ob-exp
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-macs hides /usr/share/emacs/24.3.50/lisp/org/org-macs
/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/ob-clojure hides /usr/share/emacs/24.3.50/lisp/org/ob-clojure
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/home/cassou/.emacs.d/.cask/24.3.50.2/elpa/org-plus-contrib-20140224/org-archive hides /usr/share/emacs/24.3.50/lisp/org/org-archive
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Features:
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server ido-ubiquitous warnings auto-complete-config auto-complete popup
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cl-lib easymenu ido icomplete hl-line cus-start cus-load 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)

Message #8 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Damien Cassou <damien.cassou <at> gmail.com>
Cc: 16874 <at> debbugs.gnu.org
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Tue, 25 Feb 2014 18:18:09 +0200

> From: Damien Cassou <damien.cassou <at> gmail.com>
> Date: Tue, 25 Feb 2014 10:06:49 +0100
> 
> 
> The following piece of code, from the milkypostman/powerline github
> repository, used to detect if the current window is active or not:
> 
>     (defun powerline-selected-window-active ()
>       "Return whether the current window is active."
>       (or (eq (frame-selected-window)
>               (selected-window))
>           (and (minibuffer-window-active-p
>                 (frame-selected-window))
>                (eq (pl/minibuffer-selected-window)
>                    (selected-window)))))
> 
> This works fine in released Emacs 24 but does not work anymore in
> emacs-snapshot (see below for details about the version I used to test).
> Is this an Emacs regression or a problem in the implementation of this
> function that is revealed by some recent changes in Emacs?

It's a deliberate change in Emacs that breaks functions which assume
that the window whose mode line is being redrawn is selected at that
time.

Message #11 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Damien Cassou <damien.cassou <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 16874 <at> debbugs.gnu.org
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Tue, 25 Feb 2014 17:28:57 +0100

On Tue, Feb 25, 2014 at 5:18 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:
> It's a deliberate change in Emacs that breaks functions which assume
> that the window whose mode line is being redrawn is selected at that
> time.


is there anything we can do about that?

-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

Message #14 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Damien Cassou <damien.cassou <at> gmail.com>
Cc: 16874 <at> debbugs.gnu.org
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Tue, 25 Feb 2014 19:47:58 +0200

> From: Damien Cassou <damien.cassou <at> gmail.com>
> Date: Tue, 25 Feb 2014 17:28:57 +0100
> Cc: 16874 <at> debbugs.gnu.org
> 
> On Tue, Feb 25, 2014 at 5:18 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:
> > It's a deliberate change in Emacs that breaks functions which assume
> > that the window whose mode line is being redrawn is selected at that
> > time.
> 
> is there anything we can do about that?

What kind of thing did you have in mind?

FWIW, I think code that relies on implementation details of the
display engine runs a high risk of becoming broken.  I'd rather have
application programmers request features that will allow them to do
what they want using some documented public interfaces, instead of
looking high and low for how to trick Emacs into revealing some of its
internals.

So perhaps you could explain what feature/API/hook would you want to
be added to Emacs so that powerline, whatever it is, could do its job
reliably?  Who knows, it might even be that such a feature already
exists, or is easy to implement.

Thanks.

Message #17 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Damien Cassou <damien.cassou <at> gmail.com>
Cc: 16874 <at> debbugs.gnu.org
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Wed, 26 Feb 2014 11:16:39 +0100

Damien Cassou schrieb:
> The following piece of code, from the milkypostman/powerline github
> repository, used to detect if the current window is active or not:
>
>     (defun powerline-selected-window-active ()
>       "Return whether the current window is active."
>       (or (eq (frame-selected-window)
>               (selected-window))
>           (and (minibuffer-window-active-p
>                 (frame-selected-window))
>                (eq (pl/minibuffer-selected-window)
>                    (selected-window)))))
>
> This works fine in released Emacs 24 but does not work anymore in
> emacs-snapshot (see below for details about the version I used to test).
> Is this an Emacs regression or a problem in the implementation of this
> function that is revealed by some recent changes in Emacs?
>
>
> More about this issue: https://github.com/milkypostman/powerline/issues/37

From the discussion in that thread I wasn't able to understand what that
function is needed for.  Could you describe that?  For example, why is

>       (or (eq (frame-selected-window)
>               (selected-window))

needed?  What does `pl/minibuffer-selected-window' return?  And why does

>           (and (minibuffer-window-active-p
>                 (frame-selected-window))
>                (eq (pl/minibuffer-selected-window)
>                    (selected-window)))))

one time call `frame-selected-window' and one time `selected-window'?

martin

Message #20 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Donald Curtis <d <at> milkbox.net>
To: rudalics <at> gmx.at
Cc: 16874 <at> debbugs.gnu.org, damien.cassou <at> gmail.com
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Thu, 6 Mar 2014 22:31:37 -0800

[Message part 1 (text/plain, inline)]

apologies for taking my sweet time in responding.

so what I am trying to do is set the modeline to be a bit different
depending on which window is currently selected. as it stands, there is a
`mode-line` face and a `mode-line-inactive face`. somehow emacs changes the
default face for each mode-line depending on whether it is for the "active"
window or not. I want to be able to customize other parts of the mode-line
depending on whether it is selected or not.

for example, you cannot make the `mode-line-buffer-id` face different
depending on whether its being displayed in the active window or not.

so the code I had written was able to detect whether the mode-line was
being displayed in the active window or not.

now that things have changed, my code falls on its face. the currently
suggested method is to wrap advice around the "select-window" function and
add a few hooks.

[Message part 2 (text/html, inline)]

Message #23 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Donald Curtis <d <at> milkbox.net>
Cc: rudalics <at> gmx.at, 16874 <at> debbugs.gnu.org, damien.cassou <at> gmail.com
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Fri, 07 Mar 2014 19:25:11 -0500

> so the code I had written was able to detect whether the mode-line was
> being displayed in the active window or not.

IIUC your old code was not correct in some circumstance (maybe in the
presence of multiple frames, can't remember), but indeed the change in
Emacs-24.4 (which was made to fix another problem) breaks such hacks.

The best I can offer so far goes along the following lines:

1- use post-command-hook (or better yet pre-redisplay-function) to set
   a global variable `my-selected-window'.
2- use that variable instead of (selected-window) in your modeline :eval code.


        Stefan

Message #26 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Donald Curtis <d <at> milkbox.net>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: rudalics <at> gmx.at, 16874 <at> debbugs.gnu.org, damien.cassou <at> gmail.com
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Fri, 7 Mar 2014 17:53:39 -0800

[Message part 1 (text/plain, inline)]

Cool thanks for the pre redisplay suggestion.
On Mar 7, 2014 4:26 PM, "Stefan Monnier" <monnier <at> iro.umontreal.ca> wrote:

> > so the code I had written was able to detect whether the mode-line was
> > being displayed in the active window or not.
>
> IIUC your old code was not correct in some circumstance (maybe in the
> presence of multiple frames, can't remember), but indeed the change in
> Emacs-24.4 (which was made to fix another problem) breaks such hacks.
>
> The best I can offer so far goes along the following lines:
>
> 1- use post-command-hook (or better yet pre-redisplay-function) to set
>    a global variable `my-selected-window'.
> 2- use that variable instead of (selected-window) in your modeline :eval
> code.
>
>
>         Stefan
>

[Message part 2 (text/html, inline)]

Message #29 received at 16874 <at> debbugs.gnu.org (full text, mbox):

From: Juanma Barranquero <lekktu <at> gmail.com>
To: Donald Curtis <d <at> milkbox.net>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>,
 Damien Cassou <damien.cassou <at> gmail.com>, 16874 <at> debbugs.gnu.org
Subject: Re: bug#16874: 24.3.50; Regression in active window detection
Date: Tue, 18 Mar 2014 23:18:36 +0100

tags 16874 notabug
close 16874
quit

Closing, as seems is not a bug and there's nothing to be done.

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