GNU bug report logs - #74641
When scrolling on non-selected window, this window does not change to selected.

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

From: <soliidne <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: When scrolling on non-selected window, this window does not change
 to selected.
Date: Mon, 2 Dec 2024 03:00:46 +0200

Hi !

Assume, one frame and it is split into two window. When scrolling on non-selected window, this window does not change to selected.

If these two windows contain same buffer and when scrolling on non-selected window, the individual scroll events go through to selected window, because buffer makes a few jumps there. The non-selected window remain non-selected.

Tested with: 

pixel-scroll-precision-mode enabled
pixel-scroll-mode disabled
mouse-wheel-mode enabled/disabled

emacs 29.4
archlinux
xfwm4 4.18.0-4

Message #8 received at 74641 <at> debbugs.gnu.org (full text, mbox):

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: soliidne <at> gmail.com, 74641 <at> debbugs.gnu.org
Subject: Re: bug#74641: When scrolling on non-selected window,
 this window does not change to selected.
Date: Mon, 2 Dec 2024 13:11:56 +0800

Hello,

This is a feature, not a bug, I think.

You might want to look at the setting mouse-autoselect-window.

--
Sean Whitton

Please excuse top-posting and brevity. I am writing to you from a mobile phone.

> On 2 Dec 2024, at 12:40, soliidne <at> gmail.com wrote:
> 
> Hi !
> 
> Assume, one frame and it is split into two window. When scrolling on non-selected window, this window does not change to selected.
> 
> If these two windows contain same buffer and when scrolling on non-selected window, the individual scroll events go through to selected window, because buffer makes a few jumps there. The non-selected window remain non-selected.
> 
> Tested with:
> 
> pixel-scroll-precision-mode enabled
> pixel-scroll-mode disabled
> mouse-wheel-mode enabled/disabled
> 
> emacs 29.4
> archlinux
> xfwm4 4.18.0-4

Message #11 received at 74641 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: soliidne <at> gmail.com
Cc: 74641 <at> debbugs.gnu.org
Subject: Re: bug#74641: When scrolling on non-selected window,
 this window does not change to selected.
Date: Mon, 02 Dec 2024 15:08:49 +0200

> Date: Mon, 2 Dec 2024 03:00:46 +0200
> From: <soliidne <at> gmail.com>
> 
> Hi !
> 
> Assume, one frame and it is split into two window. When scrolling on non-selected window, this window does not change to selected.
> 
> If these two windows contain same buffer and when scrolling on non-selected window, the individual scroll events go through to selected window, because buffer makes a few jumps there. The non-selected window remain non-selected.
> 
> Tested with: 
> 
> pixel-scroll-precision-mode enabled
> pixel-scroll-mode disabled
> mouse-wheel-mode enabled/disabled
> 
> emacs 29.4
> archlinux
> xfwm4 4.18.0-4

Please show a recipe, preferably starting from "emacs -Q", to
reproduce the issue.  Because just by doing what I think you did, I
cannot reproduce this: I can scroll a non-selected window without
affecting the selected window which shows the same buffer.  What am I
missing?

Message #14 received at 74641 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: soliidne <at> gmail.com
Cc: 74641 <at> debbugs.gnu.org
Subject: Re: bug#74641: When scrolling on non-selected window, this window
 does not change to selected.
Date: Mon, 02 Dec 2024 16:34:27 +0200

[Please use Reply All to reply, so that the bug tracker is CC'ed.]

> Date: Mon, 2 Dec 2024 15:51:12 +0200
> From: <soliidne <at> gmail.com>
> 
> 1. 
> If you scroll a upper non-selected window of same buffer, will the upper widow become selected ? 

No.  And it shouldn't.

> My position is that if non-selected window gets scroll event, the same window should become selected. Same way, as a mouse-1 click on a non-selected window makes that same window selected.

In that case, what Sean wrote is true: it's a feature, not a bug.
Emacs lets you scroll a window without making it the selected one.

> When you scroll upper non-selected window, the bottom selected window still "steals" some individual scroll events. Thus, scrolling in a non-selected window also affects another selected window of the same frame.

This I cannot reproduce.  If you have a recipe for reproducing this in
"emacs -Q", please show the steps to reproduce.

Message #19 received at 74641-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Sean Whitton <spwhitton <at> spwhitton.name>
Cc: 74641-done <at> debbugs.gnu.org, soliidne <at> gmail.com
Subject: Re: bug#74641: When scrolling on non-selected window, this window
 does not change to selected.
Date: Wed, 1 Jan 2025 19:55:33 -0600

Sean Whitton <spwhitton <at> spwhitton.name> writes:

> Hello,
>
> This is a feature, not a bug, I think.
>
> You might want to look at the setting mouse-autoselect-window.

I'm therefore closing this bug report.

>
> --
> Sean Whitton
>
> Please excuse top-posting and brevity. I am writing to you from a mobile phone.
>
>> On 2 Dec 2024, at 12:40, soliidne <at> gmail.com wrote:
>>
>> Hi !
>>
>> Assume, one frame and it is split into two window. When scrolling on non-selected window, this window does not change to selected.
>>
>> If these two windows contain same buffer and when scrolling on non-selected window, the individual scroll events go through to selected window, because buffer makes a few jumps there. The non-selected window remain non-selected.
>>
>> Tested with:
>>
>> pixel-scroll-precision-mode enabled
>> pixel-scroll-mode disabled
>> mouse-wheel-mode enabled/disabled
>>
>> emacs 29.4
>> archlinux
>> xfwm4 4.18.0-4

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