GNU logs - #50141, boring messages

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Subject: bug#50141: Current part of emacs red, other parts blue
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$ emacs
C-x 2
C-x 3
C-x 2
C-x 3
We have chopped the screen into little chunks.
It would be nice to have the current chunk's background e.g., red,
and the other chunks' blue.
https://stackoverflow.com/questions/33195122/highlight-current-active-window
didn't work for me.

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To: =?UTF-8?Q?=E7=A9=8D=E4=B8=B9=E5=B0=BC?= Dan Jacobson <jidanni@HIDDEN>
Subject: bug#50141: Acknowledgement (Current part of emacs red, other
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Subject: bug#50141: Current part of emacs red, other parts blue
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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> From: 積丹尼 Dan Jacobson
>  <jidanni@HIDDEN>
> Date: Sat, 21 Aug 2021 14:05:45 +0800
> 
> $ emacs
> C-x 2
> C-x 3
> C-x 2
> C-x 3
> We have chopped the screen into little chunks.
> It would be nice to have the current chunk's background e.g., red,
> and the other chunks' blue.
> https://stackoverflow.com/questions/33195122/highlight-current-active-window
> didn't work for me.

Emacs's way to mark the current window is by changing the way the mode
line is displayed.

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Subject: bug#50141: Current part of emacs red, other parts blue
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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Cc: 50141 <at> debbugs.gnu.org, =?UTF-8?Q?=E7=A9=8D=E4=B8=B9=E5=B0=BC?= Dan Jacobson <jidanni@HIDDEN>
From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Sat, 21 Aug 2021 14:48:01 +0200
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Eli Zaretskii <eliz@HIDDEN> writes:

> Emacs's way to mark the current window is by changing the way the mode
> line is displayed.

There's also `cursor-in-non-selected-windows', which is another
kinda-sorta subtle indicator.

However, Dan's request has come up a number of times (e.g., bug#12056,
which I'm merging this with), so I'm wondering whether we should add
something like this...  or at least add some infrastructure that would
allow it.

The obvious thing would be to run something from `select-window', but I
don't see any obvious hook that we could be using there.  Am I missing
something?  I was thinking about adding a minor mode for changing
background colours in windows...

On the other hand, if we want to add this, perhaps it'd make more sense
to just add a new variable to change the background colour of
non-selected backgrounds directly.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: 積丹尼 Dan Jacobson <jidanni@HIDDEN>,
>   50141 <at> debbugs.gnu.org
> Date: Sat, 21 Aug 2021 14:48:01 +0200
> 
> However, Dan's request has come up a number of times (e.g., bug#12056,
> which I'm merging this with), so I'm wondering whether we should add
> something like this...  or at least add some infrastructure that would
> allow it.
> 
> The obvious thing would be to run something from `select-window', but I
> don't see any obvious hook that we could be using there.  Am I missing
> something?  I was thinking about adding a minor mode for changing
> background colours in windows...

buffer-list-update-hook sounds like that infrastructure.

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> Date: Sat, 21 Aug 2021 16:12:41 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 50141 <at> debbugs.gnu.org, jidanni@HIDDEN
> 
> > From: Lars Ingebrigtsen <larsi@HIDDEN>
> > Cc: 積丹尼 Dan Jacobson <jidanni@HIDDEN>,
> >   50141 <at> debbugs.gnu.org
> > Date: Sat, 21 Aug 2021 14:48:01 +0200
> > 
> > However, Dan's request has come up a number of times (e.g., bug#12056,
> > which I'm merging this with), so I'm wondering whether we should add
> > something like this...  or at least add some infrastructure that would
> > allow it.
> > 
> > The obvious thing would be to run something from `select-window', but I
> > don't see any obvious hook that we could be using there.  Am I missing
> > something?  I was thinking about adding a minor mode for changing
> > background colours in windows...
> 
> buffer-list-update-hook sounds like that infrastructure.

But I think the real problem is how to define a window-specific
default face.  It's not easy, and I'm not sure it will work.
Something using the :filtered thingy, I guess?  But I'm not sure it
will work for the default face.

Basically, faces were never designed to be window-specific.  Even
making them buffer-specific (via face-remapping-alist) is somewhat
tricky.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Sat, 21 Aug 2021 15:28:25 +0200
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 Content preview: Eli Zaretskii <eliz@HIDDEN> writes: >
 buffer-list-update-hook
 sounds like that infrastructure. But it's only run if NORECORD is nil...
 But I guess that only happens when we're not really displaying the window,
 but only selecting it to select back to something else before the user
 notices? So us [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

> buffer-list-update-hook sounds like that infrastructure.

But it's only run if NORECORD is nil...  But I guess that only happens
when we're not really displaying the window, but only selecting it to
select back to something else before the user notices?  So using it
should perhaps work...

Eli Zaretskii <eliz@HIDDEN> writes:

> But I think the real problem is how to define a window-specific
> default face.  It's not easy, and I'm not sure it will work.
> Something using the :filtered thingy, I guess?  But I'm not sure it
> will work for the default face.
>
> Basically, faces were never designed to be window-specific.  Even
> making them buffer-specific (via face-remapping-alist) is somewhat
> tricky.

Yeah, I suspect we can't use faces here, but might have to add some new
window-specific background colour setting?  Which might be generally
useful, anyway.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: jidanni@HIDDEN,  50141 <at> debbugs.gnu.org
> Date: Sat, 21 Aug 2021 15:28:25 +0200
> 
> > Basically, faces were never designed to be window-specific.  Even
> > making them buffer-specific (via face-remapping-alist) is somewhat
> > tricky.
> 
> Yeah, I suspect we can't use faces here, but might have to add some new
> window-specific background colour setting?

What could that color setting be, except some face attribute?

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 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: >> Yeah, I suspect we
 can't use faces here,
 but might have to add some new >> window-specific background
 colour setting? > > What could that color setting be,
 except some face attribute?
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Yeah, I suspect we can't use faces here, but might have to add some new
>> window-specific background colour setting?
>
> What could that color setting be, except some face attribute?

I don't know -- I haven't actually looked at how this could be
implemented.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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 >> buffer-list-update-hook sounds like that infrastructure.

`window-selection-change-functions' please.

 > But I think the real problem is how to define a window-specific
 > default face.  It's not easy, and I'm not sure it will work.
 > Something using the :filtered thingy, I guess?  But I'm not sure it
 > will work for the default face.
 >
 > Basically, faces were never designed to be window-specific.  Even
 > making them buffer-specific (via face-remapping-alist) is somewhat
 > tricky.

Here I can write

(set-window-face-remapping-alist nil '((default (:background "yellow") default)))

It was pretty trivial to implement but lifting it from the rest of my
changes might be non-trivial.  If people are very, very interested, I
can give it a try.

martin

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>
> I don't know -- I haven't actually looked at how this could be 
> implemented.
>

It is already implemented AFAICS:

(require 'auto-dim-other-buffers)
(set-face-attribute 'default nil :background "red")
(set-face-attribute 'auto-dim-other-buffers-face nil :background "blue")
(auto-dim-other-buffers-mode 1)

It uses the :filtered feature introduced in Emacs 27.

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> Cc: 50141 <at> debbugs.gnu.org, jidanni@HIDDEN
> From: martin rudalics <rudalics@HIDDEN>
> Date: Sat, 21 Aug 2021 15:55:57 +0200
> 
> (set-window-face-remapping-alist nil '((default (:background "yellow") default)))
> 
> It was pretty trivial to implement but lifting it from the rest of my
> changes might be non-trivial.  If people are very, very interested, I
> can give it a try.

But the request here is not to do this for a particular window, the
request is to do this for _any_ window when it is selected.

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 Content preview: Gregory Heytings <gregory@HIDDEN> writes: > It is
 already
 implemented AFAICS: > > (require 'auto-dim-other-buffers) >
 (set-face-attribute
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 'auto-dim-other-buffers-face nil :background "blue [...] 
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Gregory Heytings <gregory@HIDDEN> writes:

> It is already implemented AFAICS:
>
> (require 'auto-dim-other-buffers)
> (set-face-attribute 'default nil :background "red")
> (set-face-attribute 'auto-dim-other-buffers-face nil :background "blue")
> (auto-dim-other-buffers-mode 1)
>
> It uses the :filtered feature introduced in Emacs 27.

Oh, cool.  I guess there isn't more to do here, then...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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 rest of my > changes might be [...] 
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martin rudalics <rudalics@HIDDEN> writes:

> Here I can write
>
> (set-window-face-remapping-alist nil '((default (:background "yellow")
> default)))
>
> It was pretty trivial to implement but lifting it from the rest of my
> changes might be non-trivial.  If people are very, very interested, I
> can give it a try.

Could be interesting...

Eli Zaretskii <eliz@HIDDEN> writes:

> But the request here is not to do this for a particular window, the
> request is to do this for _any_ window when it is selected.

It'd be used by a (minor) mode that'd loop over all windows on a
window selection change, I'd have thought?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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