Issue #2201693 by plopesc, e0ipso, swentel: Field output supporting code should move out of field.module.

Issue #2154711 by plopesc, tim.plunkett, olli, Berdir, Dave Reid: Move entity_get_(form/view)_mode_options() functions to EntityManager and add get(Form/View)ModeOptions() methods.

Issue #2169983 by plopesc, yched: Move type-specific logic from ListItemBase to the appropriate subclass.

Issue #1987398 by Nigel_S, Tim Bozeman, InternetDevels, adsw12, joelpittet, Cottser, mdrummond, dsayswhat, jerdavis, rteijeiro, LewisNyman, Rumato, gnuget: Field.module - Convert theme_ functions to Twig.

Issue #1939068 by joelpittet, tlattimore, Cottser, chrisjlee, rteijeiro, mdrummond, drupalninja99, jenlampton, shanethehat, InternetDevels, DamienMcKenna, gavin.hughes, carsonevans, ezeedub: Convert theme_image() to Twig.

Issue #1041486 by lokapujya, eporama, Pancho: Fix misleading parameter documentation in check_markup().

Issue #2122693 by jayeshanandani, YesCT, sun, alexpott, BMDan: Installer does not work on a completely empty settings.php.

Issue #2152673 by ParisLiakos: Remove duplicate edit route from aggregator and make delete/add consistent with rest of core.

Issue #2202377 by sun: Remove Test::SORT_METHODS constant opt-in support for sorting test methods alphabetically.

Issue #2211553 by andypost, Berdir: Allow usage of entity_reference field widget and formatter for base fields.

Issue #2026431 by YesCT, dawehner, Crell: Make ContentNegotiation a 'internal' service, used only by the router, so that core or contrib can implement real negotiation.

Issue #2218955 by sun: Install_profile_info() removes required module instead of profile module from dependencies.

Issue #2221789 by Schoonzie, marthinal, sidharthap | Berdir: Not possible to disable 'Save new revision' when enabled by default.

Issue #2219499 by Berdir, alexpott, Gábor Hojtsy, vijaycs85, swentel: Generalize language config override responsibility.

Issue #2212309 by joelpittet: Drupal\Core\Template and twig.engine docs, coding standards, and unused code cleanup.

Issue #2080547 by johnmcc, mrsinguyen, chertzog, Nafes: Remove Unused local variables from search module.