Inconsistent Vertical Scrolling (Smooth in Palette, Stepwise in Score Body)

cholick commented 3 weeks ago

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Create new score
Expand several items in the palette so that a scrollbar appears
Scroll with a mouse wheel in the palette
Scroll with a mouse wheel in the score body

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/918a6f02-feb6-44f5-9224-c84b7b533062

What is the latest version of MuseScore Studio where this issue is present?

4.3.2-241630832, revision: github-musescore-musescore-22b46f2

Regression

No.

Operating system

macOS 14.6, Arch.: x86_64

Additional context

I've included Chrome and a directory to show that step-wise scrolling is the expected behavior. I'm someone who strongly dislikes smooth scrolling, and have it disabled in applications that implement their own scrolling behavior outside of the operating system. The palette both scrolls smoothly and seems to be at a slightly different speed, behaving different from everything else on my computer, so the bug in my mind is how the palette has implemented vertical scrolling.

Checklist

[X] This report follows the guidelines for reporting bugs and issues
[X] I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
[X] I have attached all requested files and information to this report
[X] I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

cbjeukendrup commented 3 weeks ago

It would be interesting to test this in the latest 4.4 nightly builds (https://musescore.org/en/nightly-builds). Those use a newer version of Qt, which supposedly improves some things around scrolling.

cholick commented 3 weeks ago

It does behave the same in nightly (MuseScore Studio version (64-bit): 4.4.0-242310503, revision: github-musescore-musescore-bf636e6)

cbjeukendrup commented 3 weeks ago

That's regrettable. Then the problem that was fixed must have been something else. The thing is that for all scrollviews except the score view, we fully depend on the functionality that Qt offers. I've done some searching on the internet, and it looks like there is really no way to disable the smooth scrolling. I found an issue about it at the Qt issue tracker, that doesn't give a lot of hope: https://bugreports.qt.io/browse/QTBUG-83843. Reported years ago, but no solution. One day, we might consider patching Qt ourselves, but I'm not sure how feasible that is.

cholick commented 3 weeks ago

Thanks for digging in on that! I'd hoped it was just a flag you folks could pass through to Qt.

musescore / MuseScore