src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughPart.ts/WalkThroughPart/arrowUp
class WalkThroughPart:	arrowUp() {
		const scrollPosition = this.scrollbar.getScrollPosition();
		this.scrollbar.setScrollPosition({ scrollTop: scrollPosition.scrollTop - this.getArrowScrollHeight() });
	}