[dolphin] [Bug 451042] New: Insanely fast scrolling on file icon picker with high-res scroll wheel

[Micael Jarniac]

https://bugs.kde.org/show_bug.cgi?id=451042

            Bug ID: 451042
           Summary: Insanely fast scrolling on file icon picker with
                    high-res scroll wheel
           Product: dolphin
           Version: 21.12.2
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: icons mode
          Assignee: dolphin-bugs-null at kde.org
          Reporter: micaeljarniac at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 147242
  --> https://bugs.kde.org/attachment.cgi?id=147242&action=edit
GIF where I scroll by the same amount, a single "click" on both the file
browser and the icon browser

SUMMARY
With a high-resolution scroll wheel, such as the one found on the MX Master 3
mouse, scrolling in the file icon picker is insanely fast.

I believe that's because that specific window has no support for
high-resolution scrolling, but is still using each high-resolution scroll step
as one entire low-resolution step.

There are several high-resolution steps per low-resolution step, IIRC something
like 8, so scrolling on that window is roughly 8x faster than it should be.

On the normal file manager, scrolling is at a normal speed, and it does seem to
support high-resolution scrolling.

On the GIF, every time I scrolled, it was only a single step. You can notice
that on the normal file manager, it scrolls a normal amount, but on the icon
picker, it scrolls a lot more.

STEPS TO REPRODUCE
1. Have a high-resolution scrolling device (MX Master 3 in my case)
2. Go to the file manager, on a folder that requires scrolling
3. Scroll by a single "click" on the mouse wheel
4. Notice scrolling is at a normal speed
5. Go to the icon picker for a file or folder
6. Scroll the icons by the same amount as before, a single "click"
7. Notice that it now scrolls a whole lot more, at an insanely fast speed

OBSERVED RESULT
It scrolls a lot more, and a lot faster, on the icon picker.

EXPECTED RESULT
It should scroll by the same amount, and at the same speed, on all scrollable
elements.
High-resolution scrolling should be properly supported on all elements.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.15.25-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 4 × AMD Ryzen 3 2200G with Radeon Vega Graphics
Memory: 7.7 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970/PCIe/SSE2

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