/**
 * A Smart version of DisplayObjectContainer's builtin function, ie: target.getBounds(targetCoordinateSpace)
 * When objects are nested, this function will produce a tighter result than DisplayObjectContainer.getBounds()
 * Note: This function works on any DisplayObject, even if there are no nested children
 * Note: Empty child DisplayObjects are essentially ignored
 * param: target: see Sprite.getBounds()
 * param: targetCoordinateSpace: see Sprite.getBounds()
 * return: Rectangle bounds
 */
public static function getNestedBounds(target:DisplayObject, targetCoordinateSpace:DisplayObject):Rectangle {
	if (target.hasOwnProperty("numChildren") && (target as DisplayObjectContainer).numChildren > 0) {
		var j:int = 1;
		var nbounds:Rectangle = getNestedBounds((target as DisplayObjectContainer).getChildAt(0), targetCoordinateSpace);
		while ((nbounds.width == 0 || nbounds.height == 0) && j < (target as DisplayObjectContainer).numChildren) {
			nbounds = getNestedBounds((target as DisplayObjectContainer).getChildAt(j), targetCoordinateSpace);
			j++;
		}
		for (var i:int = j; i < (target as DisplayObjectContainer).numChildren; i++ ) {
			var bounds:Rectangle = getNestedBounds((target as DisplayObjectContainer).getChildAt(i), targetCoordinateSpace);
			if (bounds.width > 0 && bounds.height > 0) {
				var x0:Number = Math.min(bounds.x, nbounds.x);
				var y0:Number = Math.min(bounds.y, nbounds.y);
				var x1:Number = Math.max(bounds.x + bounds.width, nbounds.x + nbounds.width);
				var y1:Number = Math.max(bounds.y + bounds.height, nbounds.y + nbounds.height);
				nbounds.x = x0;
				nbounds.y = y0;
				nbounds.width = x1 - x0;
				nbounds.height = y1 - y0;
			}
		}
		return nbounds;
	} else {
		return target.getBounds(targetCoordinateSpace);
	}
}