Issue #1983136 by fubhy: Use 'instanceof' instead of class_implements() in \Drupal\Core\FileTransfe\FileTransfer.

Issue #2001206 by andypost, penyaskito, herom, Crell, ebeyrent, DmitryDrozdik: Replace drupal_container() with Drupal::service().

Issue #2119237 by cosmicdreams, Crell, damiankloip: Use \Symfony\Component\Debug\Exception\FlattenException instead of \Symfony\Component\HttpKernel\Exception\FlattenException.

Issue #2130811 by alexpott, Gábor Hojtsy, vijaycs85, sun, Wim Leers: Use config schema in saving and validating configuration form to ensure data is consistent and correct.

Issue #732022 by vijaycs85, Wim Leers, dawehner, nod_, kscheirer: Drupal_add_tabledrag() still using drupal_add_(js|library)(), should return array for #attached.

Issue #1874498 by tim.plunkett, dawehner, jibran, benjy: Provide and use API methods for retrieving base plugin and derivative names from block plugin IDs.

Issue #2018319 by yched, swentel, pcambra: Remove field_read_field(s)() and field_read_instance(s) in favor of entity_load() and entity_load_multiple_by_properties().

Issue #1912602 by dawehner, damiankloip, dagmar, tim.plunkett, bdone: Changing view access from 'Permission' to 'Role' causes AJAX error message re getRoles().

Revert "Issue #1912602 by dawehner, dagmar, tim.plunkett, bdone: Changing view access from 'Permission' to 'Role' causes AJAX error message re getRoles()."

This reverts commit 0f17b0ec.

Issue #1912602 by dawehner, dagmar, tim.plunkett, bdone: Changing view access from 'Permission' to 'Role' causes AJAX error message re getRoles().

Issue #1954892 by dawehner, David_Rothstein, tim.plunkett: Replace 'theme callback' and hook_custom_theme() with a clean theme negotiation system.

Issue #2031725 by fgm, fago, vladan.me, Nebel54, Berdir: Move all entity display interfaces to the core component.

Issue #1938390 by andypost, disasm, jibran, dawehner, ygerasimov, pfrenssen: Convert contact_site_page and contact_person_page to a new-style Controller.

Issue #2015687 by smiletrl, amateescu, Berdir, fago: Convert field type to FieldType plugin for taxonomy module.

Issue #2095283 by Berdir, chx, amateescu, vladan.me: Remove non-storage logic from the storage controllers.

Issue #1786490 by Berdir, amateescu, damiankloip, Wim Leers, dawehner: Add caching to the state system.

Revert "Issue #1786490 by Berdir, amateescu, damiankloip, dawehner: Add caching to the state system."

This reverts commit 8ec847cc.

Issue #221081 by David_Rothstein, fago, schwern, Berdir: Entity cache out of sync and inconsistent when saving/deleting entities.

Issue #2098197 by dawehner, vijaycs85, damiankloip, tstoeckler: Add getAllRoutes() method to RouteProvider .

Issue #2109793 by damiankloip, dawehner, tim.plunkett: Convert element_* methods in common.inc to a class.

Issue #2067551 by lokapujya, Kartagis, sandipmkhairnar, jlindsey15:  /core/lib/Drupal/Core/Routing/MatcherDumper.php will never roll back its transaction.

Issue #2145007 by tim.plunkett, h3rj4n: Convert form_set_error() in FormBase classes to use FormErrorInterface.