The current behavior for handling the angle delta of a wheel event
changes index the instant there is a change in angle delta. This works
fine for mouse wheels that send events with 120 angle delta units and
there is also already behavior defined for devices with pixel deltas,
but there is nothing good for handling events from high resolution mouse
wheels that don't have pixel deltas.
This patch makes it so that the current index doesn't change until the
accumulated angle delta for the X or Y axis reaches 120.
[ChangeLog][QtWidgets][QTabBar] Scrolling with a high resolution mouse
wheel changes the current index at a rate more like a normal mouse
wheel.
Task-number: QTBUG-97844
Pick-to: 6.3
Change-Id: I2e7fd88984a253f6ef8a0008deb7233e4cb4d84a
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
f0371487ce