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Subject: bug#67504: Pixel scroll down not smooth when scrolled horizontally
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In pixel-scroll-precision-mode, when the buffer is scrolled =
horizontally, scrolling up is smooth but scrolling down is not. Smaller =
movements appear to get stuck without making progress.

Scrolling up or down is smooth when the buffer is not scrolled =
horizontally (ie, left margin is visible).

Observed in Emacs 29 and 30 on macOS, NS port, scrolling with trackpad.

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To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= <mattias.engdegard@HIDDEN>
Subject: bug#67504: Acknowledgement (Pixel scroll down not smooth when
 scrolled horizontally)
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Subject: bug#67504: Pixel scroll down not smooth when scrolled horizontally
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Mattias Engdeg=C3=A5rd <mattias.engdegard@HIDDEN> writes:

> In pixel-scroll-precision-mode, when the buffer is scrolled horizontally,=
 scrolling up is smooth but scrolling down is not. Smaller movements appear=
 to get stuck without making progress.
>
> Scrolling up or down is smooth when the buffer is not scrolled horizontal=
ly (ie, left margin is visible).
>
> Observed in Emacs 29 and 30 on macOS, NS port, scrolling with trackpad.

Copying in Po Lu.

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Subject: bug#67504: Pixel scroll down not smooth when scrolled horizontally
Resent-From: Po Lu <luangruo@HIDDEN>
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From: Po Lu <luangruo@HIDDEN>
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 (Stefan Kangas's message of "Mon, 25 Dec 2023 06:30:41 -0800")
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Stefan Kangas <stefankangas@HIDDEN> writes:

> Mattias Engdeg=C3=A5rd <mattias.engdegard@HIDDEN> writes:
>
>> In pixel-scroll-precision-mode, when the buffer is scrolled
>> horizontally, scrolling up is smooth but scrolling down is
>> not. Smaller movements appear to get stuck without making progress.
>>
>> Scrolling up or down is smooth when the buffer is not scrolled
>> horizontally (ie, left margin is visible).
>>
>> Observed in Emacs 29 and 30 on macOS, NS port, scrolling with
>> trackpad.
>
> Copying in Po Lu.

I thought I replied that this is user error: pixel scrolling to a
position that requires moving point will reset hscroll unless
auto-hscroll-mode is off, as it should be if moving point to the start
of a line is not meant to reset hscroll, whether through scrolling or
otherwise.

Thanks.

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Subject: bug#67504: Pixel scroll down not smooth when scrolled horizontally
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26 dec. 2023 kl. 02.38 skrev Po Lu <luangruo@HIDDEN>:

> pixel scrolling to a
> position that requires moving point will reset hscroll unless
> auto-hscroll-mode is off, as it should be if moving point to the start
> of a line is not meant to reset hscroll, whether through scrolling or
> otherwise.

No, the bug shows even if no point motion takes place.
Here is my attempt at detailed reproduction instructions:

1. Start Emacs. Switch to a new buffer.
2. C-u 100 a
3. C-u 200 M-x duplicate-dwim RET
4. If necessary, resize the frame so that the lines wrap.
5. C-x x t
6. M-x pixel-scroll-precision-mode RET
7. C-u 100 M-g g
8. C-l   (to center point on screen)
9. C-e

Now try scrolling gently up/down using the trackpad, mouse wheel or =
similar device.
Expected: buffer scrolls smoothly in both directions.
Observed: buffer scrolls smoothly in one direction but not the other.

It would be useful if someone would try reproducing this bug on =
platforms other than macOS as well, to help us understand if the bug is =
specific to that port.

> Thanks.

You are welcome.

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