src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughPart.ts/WalkThroughPart/getArrowScrollHeight
class WalkThroughPart:	private getArrowScrollHeight() {
		let fontSize = this.configurationService.getValue('editor.fontSize');
		if (typeof fontSize !== 'number' || fontSize < 1) {
			fontSize = 12;
		}
		return 3 * (fontSize as number);
	}