Nudging causes GridView scrolling anomalies

This was seen with qt-qml HEAD at 6bf28141cc8679bf56a8da4183e9862115ef56f7
and tesla HEAD at 0c18d41a5b9b9697bb31873736ce505d0bfd8265

Start tesla and then nudge the application shown in the switcher horizontally from one
side of the screen to the other a few (20-30) pixels at a time and note how it sometimes
shoots off to the end, overshooting the screen even though boundsBehavior is
Flickable.DragOverBounds (see appSwitcher/components/ZoomedOutView.qml). Also
note how the applications seems more eager to slide to the left bounds than to the right,
but shoots over the right bounds more often.