Issue #2368797 by Wim Leers, dawehner, rteijeiro: Optimize ajaxPageState to keep Drupal 8 sites fast on high-latency networks, prevent CSS/JS aggregation from taking down sites and use HTTP GET for AJAX requests

Revert "Issue #2221699 by mpdonadio, mikey_p, kim.pepper, arlinsandbulte: HTTP_HOST header cannot be trusted"

This reverts commit 2c9eddf3.

Issue #2221699 by mpdonadio, mikey_p, kim.pepper, arlinsandbulte: HTTP_HOST header cannot be trusted

Issue #2090969 by lokapujya, tstoeckler, mgifford, mikemiles86: Minor code-style issues in SessionTestController

Issue #2392319 by alexpott, effulgentsia: Config objects (but not config entities) should by default be immutable

Issue #2136559 by Gábor Hojtsy: Config entity admin lists show configuration with overrides (eg. localized)

Issue #2281645 by dawehner, andypost: Make entity annotations use link templates instead of route names

Issue #2172017 by dawehner, larowlan, MegaChriz, kim.pepper, Désiré, Sam Hermans, tim.plunkett, Antti J. Salminen: Bulk operations does not respect entity access

Issue #2308187 by lauriii, iMiksu, joelpittet, dawehner, er.pushpinderrana: Provide a twig extension for file_create_url

Issue #2281619 by dawehner, tim.plunkett: Convert most direct usages within module code of routing related request attributes to use RouteMatchInterface instead

Issue #2358981 by tadityar, tstoeckler, larowlan, mpdonadio, Devin Carlson: Provide a mechanism for dynamic library declarations

Issue #2232477 by plach, yched, tstoeckler, amateescu: Fatal when adding new fields with NOT NULL constraints in a base table that contains existing entities

Issue #2143729 by tstoeckler, plach, jsbalsera, Berdir, mauzeh, damiankloip, andypost: Entity definitions miss a language entity key

Issue #2367743 by rpayanm, Miroling, YesCT, ianthomas_uk, shadik, gaurav.pahuja: Remove usages of drupal_form_submit() and update documentation

Issue #2230637 by plach, fran seva, yched, swentel: Create a Language field widget and the related formatter

Issue #2338873 by plach, fago, effulgentsia, swentel: Modules providing non-configurable field storage definitions can be uninstalled, leaving orphaned unpurged data

Issue #2204363 by Berdir, Wim Leers, tim.plunkett, chx: [sechole] Returning TRUE from hook_entity_access()/hook_ENTITYTYPE_access() must not bypass EntityAccessController::checkAccess()

Issue #2278017 by cilefen, bircher, effulgentsia: When a content entity type providing module is uninstalled, the entities are not fully deleted, leaving broken reference

Issue #2388467 by zaporylie: Remove \Drupal\entity_test\EntityTestViewsData and update the annotation

Issue #2364381 by Wim Leers: Exception thrown in drupal_render() causes an exception during the rendering of exceptions

Issue #2384545 by Wim Leers, jbrown: $element['#ajax']['callback'] is broken, hence breaking e.g. inserting images in CKEditor

Issue #2378095 by Wim Leers, Devin Carlson: Convert all remaining attached individual CSS/JS assets to attached asset libraries

Issue #2382667 by Wim Leers, Berdir: #post_render_callback's that result from other #post_render_calback are not processed

Issue #2362227 by dawehner, mpdonadio, znerol, tim.plunkett, skipyT: Replace all instances of current_path()

Issue #2235901 by alexpott, mdrummond, iMiksu, sun, Wim Leers: Remove custom theme settings from *.info.yml

git commit -m 'Issue #2377397 by Wim Leers, alexpott: Themes should use libraries, not individual stylesheets'

Issue #2350823 by lauriii, jhedstrom, Tim Bozeman, cilefen, davidhernandez, inqui, Cottser, xjm: Use the Classy theme in the Testing profile