[okular] [Bug 420925] Add kinetic scrolling on Trackpad use too

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=420925

--- Comment #2 from David Hurka <david.hurka at mailbox.org> ---
Do you think we shouldn’t use QScroller::scrollTo(QPoint, time=0) for such
continuous scrolling events, but QScroller::handleInput()?

Pro: The Browse tool already uses handleInput(), and that appears to work well.

Contra: We need to fake the Grabbed and Dragging state, which could maybe(?)
cause further bugs because we forget to update other scrolling methods. We also
need to create a Release event, which is difficult, because when scrolling
events stop, there are simply no further scroll events, while the Browse tool
receives a mouse release event.

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