https://bugs.kde.org/show_bug.cgi?id=399436

--- Comment #10 from nttkde <watisthis...@outlook.com> ---
I have noticed this recently, though it's kind of rare and hard to reproduce.
Probably because my mouse scroll wheel has started behaving a bit iffy and may
sometimes produce many scroll events at one scroll. 
It indeed seems the view and scrollbar component don't always stay synchronized
if it's scrolled very fast back and forth.

I attached some screenshots (taken this month).


Screenshot "dolphin incorrect scroll":
Incorrect main view scroll bar position.
There is still a full row of files above the half-visible topmost row, too.

Screenshot "dolphin correct scroll":
After first screenshot, now scrollbar at the correct position. Flicking the
mouse scroll wheel fixed the wrong position.

Screenshot "places panel"
I managed to reproduce it two days ago in a fresh VM install too, but on the
Places panel scrollbar (I have the file info panel under it so it gets a
scrollbar).
If I remember right, this time I was dragging the scroll bar (flicking it fast
back-and-forth) instead of using the scrollwheel on my mouse.
At that spot I could not scroll downwards. When I scrolled upwards, the view
didn't move until the scrollbar got to the 'correct' position where it
corresponded the view.

I haven't tried if it's reproducible in other apps, though I haven't at least
noticed.
I'm using KDE Neon user edition (Plasma 5.20 / 5.21)

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