[dolphin] [Bug 430532] New: Vertical scrolling broken for input devices with horizontal scrolling component (e.g. touchpad, trackpoint)

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https://bugs.kde.org/show_bug.cgi?id=430532

            Bug ID: 430532
           Summary: Vertical scrolling broken for input devices with
                    horizontal scrolling component (e.g. touchpad,
                    trackpoint)
           Product: dolphin
           Version: 20.11.80
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: mantapeppe at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Scrolling in a vertical direction with a touchpad is stuttery and doesn't
maintain scroll inertia unless the movement is perfectly vertical. The bug is
not present when using Dolphin 20.08.3; on my Arch install the issue appeared
on version 20.12.0, but a build of version 20.11.80 from git contains the bug
as well.

Steps to reproduce:
1. Install any Dolphin version >= 20.11.80 on a laptop
2. Open a directory with a long list of files
3. Scroll using the touchpad/trackpoint

Expected result: smooth scrolling that maintains inertia

Observed result: scrolling stops as soon as scrolling movement is not perfectly
vertical


Additional information:
I believe the bug might be similar in nature to a Konsole bug reported a few
months ago as the expected and observed behaviour are pretty much the same; the
bug in question is

https://bugs.kde.org/show_bug.cgi?id=425765

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