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Subject: bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?
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Hello,

I discovered that when scrolling with the mouse wheel while
`pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
not run.  Should they be?

TIA,

Michael.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Subject: bug#61307: Acknowledgement (30.0.50; pixel-scroll-precision-mode:
 window-scroll-functions?)
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Subject: bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Michael Heerdegen <michael_heerdegen@HIDDEN>
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Date: Mon, 06 Feb 2023 14:15:38 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Michael Heerdegen <michael_heerdegen@HIDDEN>
> Date: Mon, 06 Feb 2023 02:49:54 +0100
> 
> I discovered that when scrolling with the mouse wheel while
> `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> not run.  Should they be?

Are you saying that window-scroll-functions are _never_ run, no matter
how far and for how long you are scrolling?  Or are they sometimes run
and sometimes not, like only if you scroll far enough?

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Subject: bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?
Resent-From: Po Lu <luangruo@HIDDEN>
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From: Po Lu <luangruo@HIDDEN>
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Date: Mon, 06 Feb 2023 22:07:55 +0800
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:

> Hello,
>
> I discovered that when scrolling with the mouse wheel while
> `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> not run.  Should they be?
>
>
> TIA,
>
> Michael.

IIRC this is due to how pixel-scroll-precision-mode calls
set-window-start with NOFORCE set to t.

Patches welcome, but please make sure they do not slow precision
scrolling down.

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> Cc: 61307 <at> debbugs.gnu.org
> Date: Mon, 06 Feb 2023 22:07:55 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> Michael Heerdegen <michael_heerdegen@HIDDEN> writes:
> 
> > Hello,
> >
> > I discovered that when scrolling with the mouse wheel while
> > `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> > not run.  Should they be?
> >
> >
> > TIA,
> >
> > Michael.
> 
> IIRC this is due to how pixel-scroll-precision-mode calls
> set-window-start with NOFORCE set to t.
> 
> Patches welcome, but please make sure they do not slow precision
> scrolling down.

We should probably call window-scroll-functions once in several
scrolls, approximately, once every text line worth of scrolling or
something.

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Eli Zaretskii <eliz@HIDDEN> writes:

> > I discovered that when scrolling with the mouse wheel while
> > `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> > not run.  Should they be?
>
> Are you saying that window-scroll-functions are _never_ run, no matter
> how far and for how long you are scrolling?  Or are they sometimes run
> and sometimes not, like only if you scroll far enough?

No, never, as far as I can tell.

Michael.

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Subject: bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?
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> From: Michael Heerdegen <michael_heerdegen@HIDDEN>
> Cc: 61307 <at> debbugs.gnu.org
> Date: Mon, 06 Feb 2023 22:30:19 +0100
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > > I discovered that when scrolling with the mouse wheel while
> > > `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> > > not run.  Should they be?
> >
> > Are you saying that window-scroll-functions are _never_ run, no matter
> > how far and for how long you are scrolling?  Or are they sometimes run
> > and sometimes not, like only if you scroll far enough?
> 
> No, never, as far as I can tell.

So I guess we should add calls to window-scroll-functions inside
pixel-scroll.el functions which actually scroll.  Patches welcome.

Last modified: Sun, 12 Feb 2023 12:30:01 UTC

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