int south = style.getContainerGap(todrop, SwingConstants.SOUTH, container);
int h = container.getHeight();
int w = container.getWidth();
if (Math.abs(by - h + insets.bottom) < THRESHOLD_DISTANCE) {
List<Quartet> list = new ArrayList<Quartet>();
Quartet trio = new Quartet(h - insets.bottom, h - insets.bottom, insets.left, w - insets.right, new HorizontalTrailingContainerAnchor(container));
list.add(trio);
return list;
} else if (Math.abs(by - h + insets.bottom + south) < THRESHOLD_DISTANCE) {
List<Quartet> list = new ArrayList<Quartet>();
Quartet trio = new Quartet(h - insets.bottom - south, h - insets.bottom - south, insets.left, w - insets.right,