Window flickers when resizing Canvas element on Mac OS X

Create a Canvas element. On resize, the entire window will flicker (briefly filled with white color). If other elements are present on the scene, they will flicker too.

This happens only on Mac OS X. Doesn't happen on Windows 7.

import QtQuick 2.0

Rectangle {
    width: 360
    height: 360
	Canvas {
		anchors.fill: parent
		onPaint: {
			var ctx = getContext("2d")
			ctx.fillStyle = "#000033"
			ctx.fillRect(0, 0, width, height)
		}
    }
}

Attached is a test project reproducing the issue. Resize the window by dragging bottom right corner.