src/vs/workbench/browser/parts/editor/breadcrumbsControl.ts/OutlineItem/equals
class OutlineItem:	equals(other: BreadcrumbsItem): boolean {
		if (!(other instanceof OutlineItem)) {
			return false;
		}
		return this.element.element === other.element.element &&
			this.options.showFileIcons === other.options.showFileIcons &&
			this.options.showSymbolIcons === other.options.showSymbolIcons;
	}