Dragging inside a ListView delegate causes the ListView to scroll at lower speed, even after the drag is over

import Qt 4.7

Rectangle {
	width: 200
	height: 200

	ListView {
		id: list
		anchors.fill: parent
		model: 300
		delegate: Text {
			text: index
			MouseArea {
				anchors.fill: parent
				drag.target: dragTarget
			}
		}
	}
	Item {
		id: dragTarget
	}

	// Just for debugging: show the scrolling speed. Removing this won't affect the problem

	Text {
		property int topSpeed: max(list.verticalVelocity)

		function max(s) {
			s = Math.abs(s)
			return (s > 0) ? Math.max(topSpeed, s) : 0;	//nevermind the binding loop here, only for debugging purposes
		}

		anchors {top:  parent.top; right: parent.right}
		horizontalAlignment: Text.AlignRight
		text:  "Speed: " + Math.round(list.verticalVelocity) + " pixels/s \n Top: " + topSpeed
	}
}