src/vs/base/browser/dom.ts/getLargestChildWidth
export function getLargestChildWidth(parent: HTMLElement, children: HTMLElement[]): number {
	let childWidths = children.map((child) => {
		return Math.max(getTotalScrollWidth(child), getTotalWidth(child)) + getRelativeLeft(child, parent) || 0;
	});
	let maxWidth = Math.max(...childWidths);
	return maxWidth;
}