inconsistent mouse scrolling in one direction

[drew-parsons]

Avogadro version: 1.97.0

• Avogadrolibs: 1.97.0
• Qt: 5.15.4

Desktop version: (please complete the following information):

• OS: Debian Linux
• Version debian unstable (linux 5.18.14-1)
• Compiler g++ 12.1.0

Describe the bug

The action of the mouse scroll button is inconsistent. When I scroll in one direction, the molecule moves smoothly "downwards" (further away into the screen) as expected. But when I scroll in the opposite direction, the molecule jumps placing the central atom right on your nose (i.e. only half the molecule shows, as if you zoomed right into the centre of the molecule).

The toggle switch "Reverse Direction of Zoom on Scroll" is working as expected. i.e. whether scroll-down is normal scroll-up is broken, or the other way around, can be swapped with the toggle switch.

To Reproduce
Steps to reproduce the behavior:

1. Create a molecule
2. Use the mouse scroll button to move the molecule "far away"
3. Use the mouse scroll button to pull the molecule back close again
4. See error: molecule jumps to centre instead of scrolling back.

Expected behavior

Mouse scroll button should push and pull the molecule out and back again smoothly with no jump.

Screenshots

Molecule scrolled outwards to "far away"

Molecule scrolled back one step in the opposite direction

Additional context

debian build 1.97.0-1

[aerkiaga]

Hi, thanks for the detailed report. I'd like to ask for some more info, since I can't reproduce the issue:

• What Desktop Environment are you using? Are you on X or Wayland?
• What brand and model is your mouse?
• Did you build from source? If so, does this happen on older versions, or on pre-packaged Avogadro 2?
• Does this happen with other programs or just Avo2? E.g. if you install Krita (which uses Qt), does this happen when zooming out the canvas?

[drew-parsons]

I'm using Gnome on X11 (since video conferencing tools - skype, Teams - don't yet support Wayland).
Mouse is Logitech Performance MX (a little old by now).
I've only noticed the problem with Avo2. Krita zooms in and out smoothly in the normal way.

I built from source (though my local build gets replaced by the official Debian build). But the git repo's nightly AppImage ./Avogadro2-x86_64.AppImage does reproduce the same problem.

[aerkiaga]

Let me test it on Gnome on X... Did you encounter this issue before, or did it appear upon upgrading Avogadro or other packages?

[drew-parsons]

I didn't notice this error before. I can now reproduce the same problem in the previous version though, if I install the1.96.0-2 build. Might be a month or so since I last accessed Avogadro.

[aerkiaga]

Unfortunately, I can't reproduce it on either GNOME 3.36.8 X.org or GNOME 42.3 Wayland... Do you get the same behavior if you check out 1.95.1 and build from source?

[drew-parsons]

debian unstable has Gnome 42.3.1. In principle that shouldn't affect Qt operation though. If I understand correctly USB events are managed via DBUS, which is 1.14.0-2 here.

[drew-parsons]

I didn't rebuild 1.95.1, but I installed the old builds for avogadro 1.95.1-2 and avogadrolibs 1.95.1-9 from snapshot.debian.org.

Avo2 1.95.1 scrolls smoothly back and forth, it doesn't show the erroneous jump. I guess that indicates the problem is in one of the patches introduced in Avo2 1.96.0, not in DBUS or Gnome 4 as such.

[aerkiaga]

There was indeed some work on zoom between the two tags. Let's see...

[aerkiaga]

@drew-parsons here's a possible fix (#1065). You can check out the branch or wait for the binary artifacts produced by the CI. Either way, please let us know if it fixes the issue!

[drew-parsons]

Looks like the fix should show up in the nightly appstream, so I'll wait for that.

[drew-parsons]

It's fixed in the nightly AppImage now