Are you looking at the right code? I see this from Qt5.4 source
(qtbase/src/gui/kernel/qwindowsysteminterface.h)
static void handleWheelEvent(QWindow *w, const QPointF & local, const
QPointF & global, QPoint pixelDelta, QPoint angleDelta, Qt::KeyboardModifiers
mods = Qt::NoModifier, Qt::ScrollPhase phase = Qt::ScrollUpdate);
static void handleWheelEvent(QWindow *w, ulong timestamp, const QPointF &
local, const QPointF & global, QPoint pixelDelta, QPoint angleDelta,
Qt::KeyboardModifiers mods = Qt::NoModifier, Qt::ScrollPhase phase =
Qt::ScrollUpdate);
Scroll units are floats. The line you're quoting is a QtMir internal
thing, which we mistakenly used ints for.
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https://bugs.launchpad.net/bugs/1605513
Title:
Touchpad scrolling is disproportionately faster than mouse wheel
scrolling
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