The phase changes to ScrollEnd as soon as the user's fingers
are lifted from the trackpad; then the OS can optionally continue
sending scroll events to simulate deceleration, which are translated
into more QWheelEvents with phase ScrollUpdate. With this patch,
the phase of the final event after the momentum phase will be
ScrollEnd to indicate that the scrolling is completely finished.
[ChangeLog][QtGui][QWheelEvent] on OSX, trackpad wheel event phase
transitions occur in the order ScrollBegin, ScrollUpdate, ...,
ScrollEnd, ScrollUpdate, ..., ScrollEnd, where the second batch of
updates represent momentum events (inertial scrolling).
Change-Id: I7404ed6fbbeaff6b1fa63e226fe1800494986b7b
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>
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