Run the attached touch.qml code (e.g. with qml runtime) and touch quickly (no delay between press and release) on item #2. The y position of the touch event is logged to the console (which is relative to the delegate). For instance, I got:
qml: Pressed: 71.1
qml: Released: -229.4
The release position is wrong, it should be ~71, however it's basically:
70.6 (correct position) - 2 (model.index ) * 150 (delegate height) = - 229.4