Issue #2443651 by alexpott, mradcliffe, bzrudi71: PostgreSQL: Fix system\Tests\Cache\DatabaseBackendUnitTest

Issue #2471405 by tompagabor: When not logged Drupal\Core\EventSubscriber\FinishResponseSubscriber->setExpiresNoCache() causes a PHP warning because of an invalid timezone.

Revert "Issue #2470069 by wadmiraal, Manjit.Singh, pjbaert, zakxxi, LewisNyman: Refactor color module CSS inline with our CSS standards"

This reverts commit 1ea7b90a.

Issue #2470069 by wadmiraal, Manjit.Singh, pjbaert, zakxxi, LewisNyman: Refactor color module CSS inline with our CSS standards

Issue #2473113 by znerol, dpovshed, Wim Leers, Fabianx, dawehner, effulgentsia: All stack middlewares are constructed at the same time even for cached pages

Issue #2395143 by amateescu, Fabianx, Berdir, beejeebus, dashaforbes, alexpott, larowlan, znerol, dawehner, catch, neclimdul, yched, fgm, effulgentsia: YAML parsing is very slow, cache it with FileCache

Issue #2474909 by alexpott, mpdonadio, znerol, catch, Wim Leers, Berdir: Allow Simpletest to use the same APC user cache prefix so that tests can share the classmap and other cache objects

Issue #2479593 by jhedstrom, zaporylie: Use User::getAnonymousUser() in DblogController::eventDetails()

Issue #1942682 by zaporylie, deadbeef, jhedstrom, dawehner: Blank detail view in dblog for deleted users

Issue #2478443 by Wim Leers: Set the 'is-active' class for anonymous users in a Response Filter instead of a #post_render_cache callback

Issue #2468873 by pfrenssen, Dom., dawehner, znerol, xjm: Test that the authentication provider doesn't leak authentication credentials from the previous request

Issue #2449457 by Anushka-mp, sasanikolic, Berdir, plach: inconsistent checks in content_translation

Issue #2450251 by alexpott, xjm, sasanikolic, Berdir: Bundle cache is not invalidated after changing translation settings

Issue #2405165 by yched, alexpott, xjm: Entity::setOriginalId() does enforceIsNew(FALSE), that is wrong for ConfigEntities

Issue #2123251 by Jelle_S, marcvangend, attiks, Sutharsan: Improve DX of responsive images; convert theme functions to new #type element

Issue #2408513 by MathieuSpil, Manjit.Singh, Vidushi Mehta, svendecabooter, LewisNyman, emma.maria: Refactor forum module CSS files inline with our CSS standards

Issue #2463009 by Wim Leers: Introduce CacheableResponseInterface: consolidate ways of setting X-Drupal-Cache-Tags/Contexts headers

Issue #2478247 by Mile23: SIMPLETEST_BASE_URL is an environmental requirement which should not fail tests

Revert "Issue #2429443 by vijaycs85, rteijeiro, penyaskito, gloob, xjm, nod_, geertvd, Wim Leers, Gábor Hojtsy, Fabianx, pjonckiere, tim.plunkett: Date format form is unusable"

This reverts commit 37e278b4.

Issue #2466585 by Wim Leers, Fabianx: Decouple cache implementation from the renderer and expose as renderCache service

Issue #2400143 by geertvd, pcambra, koence, pjonckiere: Bulk form actions display action message in the confirmation form

Issue #2429443 by vijaycs85, rteijeiro, penyaskito, gloob, xjm, nod_, geertvd, Wim Leers, Gábor Hojtsy, Fabianx, pjonckiere, tim.plunkett: Date format form is unusable

Issue #2432585 by almaudoh, znerol, dawehner, cpj: Improve authentication manager service construction to support custom global service providers

Issue #2322195 by rpayanm, nlisgo, cilefen, balagan, LinL, akashjain132, filijonka, epari.siva, Tebro, Temoor, pcambra, unstatu, Poornima3, Shivam Agarwal, abhi170893, Dom., PieterJanPut, Mile23, JeroenT, disasm: Replace all instances of user_load(), user_load_multiple(), entity_load('user') and entity_load_multiple('user') with static method calls