[dolphin] [Bug 421428] New: Scrollbar is hidden in Dolphin under macOS until you use arrow keys

[Yurii Kolesnykov]

https://bugs.kde.org/show_bug.cgi?id=421428

            Bug ID: 421428
           Summary: Scrollbar is hidden in Dolphin under macOS until you
                    use arrow keys
           Product: dolphin
           Version: 20.04.0
          Platform: Homebrew (macOS)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: root at yurikoles.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

no scrolling normally
https://user-images.githubusercontent.com/4255480/81734876-7b203380-9494-11ea-90b6-35a49096fdf5.png

but if you go down with the arrow keys, the scrollbar appears and you can
scroll for about 1 second, until the scrollbar disappears again

https://user-images.githubusercontent.com/4255480/81735118-dce09d80-9494-11ea-8445-fb304e997a25.png

actually the only view layout which always works is the middle one

https://user-images.githubusercontent.com/4255480/81735736-c850d500-9495-11ea-9478-dad3e74065af.png

and if you switch to the middle layout, scroll there, and then switch back to
the initial layout or to the tree layout, the scrolling is again enabled for a
second, and then disappears again. Like you would have "scrolled" using keys.

It seems as soon as you somehow can activate the scrollbar in general, it works
again for all three views, and not only the middle one (but only very short for
a second or so)

EXPECTED RESULT

Observe scrollbar.

SOFTWARE/OS VERSIONS
macOS: Catalina 10.15.4 (19E287)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.14.2

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