private void init() {
		if (!loaded) {
			loaded = true;
			height = 0;
			width = 0;
			for (Icon icon : iconList) {
				height = Math.max(height, icon.getIconHeight());
				width = Math.max(width, icon.getIconWidth());
			}
		}
	}
Adds an icon that is to be drawn on top of the base icon and any other icons that
have been added.
@param icon the icon to be added.
Ghidra/Framework/Gui/src/main/java/resources/MultiIcon.java