bug#67504: Pixel scroll down not smooth when scrolled horizontally

[Po Lu]

Stefan Kangas <stefankangas@gmail.com> writes:

> Mattias Engdegård <mattias.engdegard@gmail.com> 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.