Jerky/snappy scrolling in utility and processing panels

[masterpiga]

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

This affects macOS when using the magic trackpad to scroll panels up and down.

It is documented here:

https://discuss.pixls.us/t/jerky-scroll-in-utility-and-processing-modules/57851?u=masterpiga

I traced it back to #20801, scrolling works as intended before 38ae3ce.

Steps to reproduce

1. Enable scrolling in side panels
2. Try to scroll a long side panel

You will see the panel jumping around, snapping at certain points and you won't be able to position it exactly as you want.

Expected behavior

It should be possible to scroll to the desired position

Logfile | Screenshot | Screencast

Screen.Recording.2026-05-20.at.19.58.33.mp4

Commit

38ae3ce

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.5.0

What OS are you using?

Mac

What is the version of your OS?

Tahoe26.3.1 (a)

Describe your system

No response

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

[masterpiga]

@dtorop @TurboGit