Function collapse

src/components/collapsableList.js:55–59

()

	});

	let collapse = () => {
		$mainWrapper.classList.add("hidden");
		if ($mainWrapper.ontoggle) $mainWrapper.ontoggle.call($mainWrapper);
		delete $ul.dataset.scrollTop;
	};

	let expand = () => {
		$mainWrapper.classList.remove("hidden");