Zooming by scroll wheel does not work on Wayland

[boardend]

On Linux (tested with Ubuntu 22.04) with Wayland the scroll events are not propagated to the WheelHandler in MapCanvas.qml (same for QFieldCamera.qml).

Observations:

• System wide zoom and fractional zooming (which can cause hiccups in some apps) are not affecting the issue
• Zooming by pinching on the touch screen works
• Scrolling in QML-based list and form views works just fine
• When logging in into a X11 session, scrolling works fine by scroll wheel and also touch screen
• Handling the wheelEvent in QgsQuickMapCanvasMap with C++ fires also on Wayland

(cc @mohsenD98 )

[nirvn]

@boardend , good to keep track of this; I believe this is a relevant upstream issue: https://bugreports.qt.io/browse/QTBUG-112432

[boardend]

Sounds like a tough one and will probably take some time... We could mitigate this on our side, by moving the WheelHandler from MapCanvas.qml to QgsQuickMapCanvasMap (until resolved in Wayland and Qt platform)