🍒 Slider: Fix slider scrolling direction
We always want the slider to increase its value when scrolling up or right, no matter the inverted scrolling setting.
For "regular" scrolling, this corresponds to positive values on
the Y axis and negative values on the X axis. For "natural"
scrolling (indicated by the inverted
property) is the opposite
so we need to reverse the sign.
Note that the Qt documentation on WheelEvent is dubious:
On https://doc.qt.io/qt-5/qml-qtquick-wheelevent.html, the
angleDelta
section suggests that positive should be up/right,
but the inverted
section indicates the above mentioned behavior.
This commit borrows from Slider.qml and 5d6d74ef68889da7400cb2a16a73527f1927424d in qqc2-desktop-style.
BUG: 479028 BUG: 479879 FIXED-IN: 6.0
(cherry picked from commit aea3d4b1)