Found the problem:
void handleWheelEvent(ulong timestamp, QPoint angleDelta,
Qt::KeyboardModifiers mods) override
QPoint is a pair of integers, but touchpad scroll values are floats.
** Changed in: unity8 (Ubuntu)
Status: New => Invalid
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1605513
Title:
Touchpad scrolling is disproportionately faster than mouse wheel
scrolling
Status in Canonical System Image:
New
Status in qtmir package in Ubuntu:
New
Status in unity8 package in Ubuntu:
Invalid
Bug description:
Touchpad scrolling is disproportionately faster than mouse wheel
scrolling in Unity8 (web browser and system settings).
I can only say this with confidence today because I implemented
accurate smooth scrolling in Xmir yesterday, so I know how it should
behave.
It's possible QtMir is overreacting to the large number of events that
touchpads generate compared to a mouse wheel, without taking into
account the scroll magnitude of each one is smaller.
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