Issue #2392845 by amateescu, nuez, seanB, Alumei, penyaskito, vprocessor, steveoliver, lokapujya, tim.plunkett, yched, Sam152, Wim Leers, jibran, kristiaanvandeneynde, Berdir, larowlan, hchonov, fago: Add a trait to standardize handling of computed item lists