* bug#16874: 24.3.50; Regression in active window detection
@ 2014-02-25 9:06 Damien Cassou
2014-02-25 16:18 ` Eli Zaretskii
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Damien Cassou @ 2014-02-25 9:06 UTC (permalink / raw)
To: 16874
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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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-02-25 9:06 bug#16874: 24.3.50; Regression in active window detection Damien Cassou
@ 2014-02-25 16:18 ` Eli Zaretskii
2014-02-25 16:28 ` Damien Cassou
2014-02-26 10:16 ` martin rudalics
2014-03-07 6:31 ` Donald Curtis
2 siblings, 1 reply; 9+ messages in thread
From: Eli Zaretskii @ 2014-02-25 16:18 UTC (permalink / raw)
To: Damien Cassou; +Cc: 16874
> From: Damien Cassou <damien.cassou@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.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-02-25 16:18 ` Eli Zaretskii
@ 2014-02-25 16:28 ` Damien Cassou
2014-02-25 17:47 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Damien Cassou @ 2014-02-25 16:28 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 16874
On Tue, Feb 25, 2014 at 5:18 PM, Eli Zaretskii <eliz@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
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-02-25 16:28 ` Damien Cassou
@ 2014-02-25 17:47 ` Eli Zaretskii
0 siblings, 0 replies; 9+ messages in thread
From: Eli Zaretskii @ 2014-02-25 17:47 UTC (permalink / raw)
To: Damien Cassou; +Cc: 16874
> From: Damien Cassou <damien.cassou@gmail.com>
> Date: Tue, 25 Feb 2014 17:28:57 +0100
> Cc: 16874@debbugs.gnu.org
>
> On Tue, Feb 25, 2014 at 5:18 PM, Eli Zaretskii <eliz@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.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-02-25 9:06 bug#16874: 24.3.50; Regression in active window detection Damien Cassou
2014-02-25 16:18 ` Eli Zaretskii
@ 2014-02-26 10:16 ` martin rudalics
2014-03-07 6:31 ` Donald Curtis
2 siblings, 0 replies; 9+ messages in thread
From: martin rudalics @ 2014-02-26 10:16 UTC (permalink / raw)
To: Damien Cassou; +Cc: 16874
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
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-02-25 9:06 bug#16874: 24.3.50; Regression in active window detection Damien Cassou
2014-02-25 16:18 ` Eli Zaretskii
2014-02-26 10:16 ` martin rudalics
@ 2014-03-07 6:31 ` Donald Curtis
2014-03-08 0:25 ` Stefan Monnier
2 siblings, 1 reply; 9+ messages in thread
From: Donald Curtis @ 2014-03-07 6:31 UTC (permalink / raw)
To: rudalics; +Cc: 16874, damien.cassou
[-- Attachment #1: Type: text/plain, Size: 886 bytes --]
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.
[-- Attachment #2: Type: text/html, Size: 1058 bytes --]
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-03-07 6:31 ` Donald Curtis
@ 2014-03-08 0:25 ` Stefan Monnier
2014-03-08 1:53 ` Donald Curtis
0 siblings, 1 reply; 9+ messages in thread
From: Stefan Monnier @ 2014-03-08 0:25 UTC (permalink / raw)
To: Donald Curtis; +Cc: 16874, damien.cassou
> 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
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-03-08 0:25 ` Stefan Monnier
@ 2014-03-08 1:53 ` Donald Curtis
2014-03-18 22:18 ` Juanma Barranquero
0 siblings, 1 reply; 9+ messages in thread
From: Donald Curtis @ 2014-03-08 1:53 UTC (permalink / raw)
To: Stefan Monnier; +Cc: 16874, damien.cassou
[-- Attachment #1: Type: text/plain, Size: 755 bytes --]
Cool thanks for the pre redisplay suggestion.
On Mar 7, 2014 4:26 PM, "Stefan Monnier" <monnier@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
>
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#16874: 24.3.50; Regression in active window detection
2014-03-08 1:53 ` Donald Curtis
@ 2014-03-18 22:18 ` Juanma Barranquero
0 siblings, 0 replies; 9+ messages in thread
From: Juanma Barranquero @ 2014-03-18 22:18 UTC (permalink / raw)
To: Donald Curtis; +Cc: Damien Cassou, 16874
tags 16874 notabug
close 16874
quit
Closing, as seems is not a bug and there's nothing to be done.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2014-03-18 22:18 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-02-25 9:06 bug#16874: 24.3.50; Regression in active window detection Damien Cassou
2014-02-25 16:18 ` Eli Zaretskii
2014-02-25 16:28 ` Damien Cassou
2014-02-25 17:47 ` Eli Zaretskii
2014-02-26 10:16 ` martin rudalics
2014-03-07 6:31 ` Donald Curtis
2014-03-08 0:25 ` Stefan Monnier
2014-03-08 1:53 ` Donald Curtis
2014-03-18 22:18 ` Juanma Barranquero
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