src/vs/platform/undoRedo/common/undoRedoService.ts/WorkspaceStackElement/toString
class WorkspaceStackElement:	public toString(): string {
		return `[id:${this.id}] [group:${this.groupId}] [${this.invalidatedResources ? 'INVALID' : '  VALID'}] ${this.actual.constructor.name} - ${this.actual}`;
	}