[konsole] [Bug 415508] Scrollbar set to 'hidden' reappears when scrolling twice via touchpad

[Ferdinand B]

https://bugs.kde.org/show_bug.cgi?id=415508

--- Comment #12 from Ferdinand B <theferdi265 at gmail.com> ---
UPDATE:

I tried to reproduce this bug on a system other than my own now, and found the
following:

- the bug only occurs on wayland
- the bug only occurs with touchpads (e.g. a synaptics laptop touchpad)
- the bug only occurs with Qt 5.14 or greater

Reproducing System Config:

- ArchLinux with sway, Qt 5.14 (my daily driver)
- Fedora KDE Rawhide (tested with [[
https://kojipkgs.fedoraproject.org/compose/rawhide/Fedora-Rawhide-20200428.n.0/compose/Spins/x86_64/iso/Fedora-KDE-Live-x86_64-Rawhide-20200428.n.0.iso
| nightly from 2020.04.28 ]])
  note: this starts KDE in X11 by default, need to install
`plasma-workspace-wayland`, exit the X11 session, and run `startplasma-wayland`
on a tty to get KDE in wayland mode

most likely, any system with Wayland and Qt 5.14 should do, but these are the
two I tested it with.

I didn't find a distro yet that ships a working wayland and Qt 5.14 on their
live install media, so this convoluted testing setup is all I have as of now.
Fedora Workstation Rawhide *should* work directly in the Live ISO, but the
current nightly has a broken GDM and I haven't found a working one yet, so I
tried the KDE variant.

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