src/vs/workbench/contrib/welcome/walkThrough/browser/walkThroughPart.ts/WalkThroughPart/updatedScrollPosition
class WalkThroughPart:	private updatedScrollPosition() {
		const scrollDimensions = this.scrollbar.getScrollDimensions();
		const scrollPosition = this.scrollbar.getScrollPosition();
		const scrollHeight = scrollDimensions.scrollHeight;
		if (scrollHeight && this.input instanceof WalkThroughInput) {
			const scrollTop = scrollPosition.scrollTop;
			const height = scrollDimensions.height;
			this.input.relativeScrollPosition(scrollTop / scrollHeight, (scrollTop + height) / scrollHeight);
		}
	}