src/vs/workbench/contrib/files/browser/views/openEditorsView.ts/OpenEditorsView/getOptimalWidth
class OpenEditorsView:	override getOptimalWidth(): number {
		let parentNode = this.list.getHTMLElement();
		let childNodes: HTMLElement[] = [].slice.call(parentNode.querySelectorAll('.open-editor > a'));

		return dom.getLargestChildWidth(parentNode, childNodes);
	}