[kde] [Bug 387182] New: Scrolling bug with KDE/QT apps, but not with GTK

[Manuel Plavsic]

https://bugs.kde.org/show_bug.cgi?id=387182

            Bug ID: 387182
           Summary: Scrolling bug with KDE/QT apps, but not with GTK
           Product: kde
           Version: unspecified
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: manuel.plavsic at posteo.ch
  Target Milestone: ---

I have a laptop that I sometimes connect to an external monitor. I had frequent
crashed with the external monitor until I changed from OpenGL 2.0 to OpenGL 3.1
in the display settings. Although this is not the reason I am filling this bug
report, maybe it could be advised to people that report problems with external
displays.
That solved almost all problems, but there is only one left now. It is weird
because it happens only on the laptop and only with KDE applications (maybe QT
in general), but not with GTK applications. The problem happens with both
OpenGL 2.0 and OpenGL 3.1. I didn't test it on wayland. I don't have a complete
scaled display, but my fonts DPI is set to 120. I'm using KDE neon 5.11.3.
The problem is: if I scroll with the touchpad or with a mouse on Firefox, it
scrolls normally. But if I change application, let's say I click on Okular and
I want to scroll, as soon as I start scrolling it goes one page back (so it
doesn't start scrolling from where it should be supposed to start), and this is
becoming very annoying. If I go back to Firefox again, it will work all right,
and if I go back to another KDE app it will start scrolling in a weird way.

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