Issue #2451395 by dawehner: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them

Issue #2453341 by Wim Leers: Contact forms don't have necessary cache contexts & tags; flood control should work on validate, not on view

Issue #1897058 by disasm, rteijeiro: Replace "boolean" with "bool" when used as param/return/var type

Issue #2459971 by Gábor Hojtsy: The langcode key on configuration files is not explicit in configuration schema

Issue #2457781 by prateekMehta, stefan.r, AjitS, hussainweb: Use Utility\Html class instead of Utility\String for decodeEntities() function

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2212069 by Gábor Hojtsy, pjonckiere, rteijeiro, cilefen: Non-English Drupal sites get default configuration in English, edited in English, originals not actually used if translated

Issue #2451665 by dawehner: Don't rebuild the route on ModuleInstaller::install() (30% installer speedup)

Issue #2090115 by alexpott, xjm: Don't install a module when its default configuration has unmet dependencies

Issue #2451085 by dawehner, Arla: _drupal_log_error() passes NULL to ThemeManager::setActiveTheme(), violating its typehint

Issue #2452347 by alexpott: "Make sure that the $test_class..." text appearing in whilst running Drupal\simpletest\Tests\KernelTestBaseTest

Issue #356399 by dawehner, beejeebus, catch, sidharrell, klausi, nlisgo, Josh Waihi, Berdir, martin107: Optimize the route rebuilding process to rebuild on write

Issue #2342045 by dawehner, Gábor Hojtsy, larowlan, joshtaylor: Standard views base fields need to use same rendering as Field UI fields, for formatting, access checking, and translation consistency

Issue #2433595 by chx, Berdir: WebTestBase::refreshVariables only resets cache_tags.invalidator.checksum

Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2322639 by hussainweb, LinL, Temoor, oenie, MKorostoff, mglaman, kyuubi, unstatu, omers, pcambra, legolasbo, benjy, JeroenT: Replace all instances of node_type_load(), node_type_get_types(), entity_load('node_type') and entity_load_multiple('node_type') with static method calls from DRUPAL SOUTH WOOOO!

Issue #2315791 by alexpott, cilefen, dawehner: Add functionality to open results in browser window to run-tests.sh

Issue #2407765 by Wim Leers, borisson_: Wherever simple config is used to render output to end user, associate their cache tags

Issue #2395901 by chx, dawehner, tstoeckler: Allow the same test-specific overrides in KernelTestBase as in WebTestBase

Issue #2144669 by Mile23, daffie, Nitesh Sethia: Improve/Refactor TestBase Through Expanded Unit Testing

Issue #2363341 by tim.plunkett, donquixote, adci_contributor: Throw exception in Drupal::service() and friends, if container not initialized yet

Revert "Issue #2144669 by Mile23, Nitesh Sethia: Improve/Refactor TestBase Through Expanded Unit Testing"

This reverts commit 921317dc.