Need a way to limit ListView's over bounds dragging

There needs to be a way to limit the negative range of a view's contentY that
doesn't cause it to lock-up.

I.e. run the code below. Drag slowly down as to reveal more than 100 pixel-lines
behind the list. Note how the list items stop, showing only 100 pixel-lines of
white. Release the mouse button and note how the list slides back to contentY == 0.

Now flick down fast and note how the list items get stuck at contentY == -100.

import QtQuick 1.1

Rectangle {
    width: 360
    height: 480

    ListView {
        anchors.fill: parent
        model: 200
        onContentYChanged: if(contentY < -100) contentY = -100;
        delegate: Rectangle {
            width: ListView.view.width
            height: 40
            color: index % 2 ? "gray" : "lightgray"
        }
    }
}