CURRENT BEHAVIOUR Both 2-finger scroll/zoom gestures do some wired zooming. PROPOSED BEHAVIOUR 1. Content follows 2-finger movement (macOS trackpad default gesture for scrolling). 2. Content zooms with two-finger pinch gesture (macOS trackpad default gesture for zoom in/out).
Yes -- that would be good to implement. It depends on whether Qt gets touch gestures from the trackpad. I also notice that trying to zoom with a two-finger gesture (should right now be seen as a wheel event) is very erratic.
Should be available on 4.0 for macOS...