src/vs/base/browser/ui/breadcrumbs/breadcrumbsWidget.ts/BreadcrumbsWidget/isDOMFocused
class BreadcrumbsWidget:	isDOMFocused(): boolean {
		let candidate = document.activeElement;
		while (candidate) {
			if (this._domNode === candidate) {
				return true;
			}
			candidate = candidate.parentElement;
		}
		return false;
	}