Method pop

src/main/java/field/graphics/FLine.java:2175–2182

()

		heading = heading.duplicate();
		return moveTo(nodes.get(s.index).to);
	}

	/**
	 * removes 'n' number of drawing instructions from the start of this line
	 */
	public FLine trimStart(int n) {
		n = Math.min(n, nodes.size());
		if (n == 0) return this;

		mod++;
		nodes = new ArrayList(nodes.subList(n, nodes.size()));