src/vs/workbench/browser/parts/editor/breadcrumbsControl.ts/BreadcrumbsControl/_getEditorGroup
class BreadcrumbsControl:	private _getEditorGroup(data: object): SIDE_GROUP_TYPE | ACTIVE_GROUP_TYPE | undefined {
		if (data === BreadcrumbsControl.Payload_RevealAside) {
			return SIDE_GROUP;
		} else if (data === BreadcrumbsControl.Payload_Reveal) {
			return ACTIVE_GROUP;
		} else {
			return undefined;
		}
	}