Issue #2245721 by vijaycs85, YesCT: Add missing configuration schema in language component.
Issue #1871762 by eojthebrave, jibran, xjm: Add detailed documentation explaining the block system's architecture.
Issue #2257769 by tstoeckler | sun: Adding an Entity Reference field in the Field UI throws a PHP notice; fails to add field.
Issue #2257427 by sun: Run-tests.sh builds + rebuilds two kernels from scratch for every PHP process.
Issue #2257229 by marcingy | alasda: Cannot add external url or <front> as menu item.
Issue #2259167 by sun: Disable CSS/JS aggregation and caching in tests by default.
Issue #2258831 by sun | Wim Leers: Stream wrappers of test runner are not restored after test completion.
Issue #2259361 by jweowu | David_Rothstein: Document that db_query_temporary() can only be used on SELECT queries.
Issue #2191785 by sun: Password managers are identifying/storing wrong username field when creating a user account.
Issue #2259315 by effulgentsia: Remove _system_path usage from shortcut.module.
Issue #2258091 by yched: Reorder methods in EntityViewBuilder into more logical sequence.
Issue #2251829 by damiankloip: Add 'Guzzle' back to HTTP clients default user agent header.
Issue #2241827 by killua99, dawehner, djevans | Crell: Using a numeric placeholder in paths in Views UI causes fatal error.
Issue #2030605 by tim.plunkett, mr.baileys, webwarrior, Wim Leers | plopesc: Expand Editor with methods.
Issue #1932074 follow-up by andypost: Remove duplicated #type declaration.
Issue #2216531 by Jalandhar, Mile23: Improve unit test annotation for SimpleTest.
Issue #1832870 by -enzo-, YesCT, EllaTheHarpy, Pinolo, dlu, seranooo5, ivanchaer, mauzeh, filijonka, robertdbailey | maryedith: Only show source translation column if there are 2 or more source languages (more than n/a and the original language).
Issue #2241827 follow-up by tim.plunkett, sun: Switch from form builder to new form validator.
Issue #2183113 by jhodgdon, effulgentsia, tim.plunkett, herom, larowlan: Update hook_help signature to use route_name instead of path.
Issue #2124365 by Mile23: Expand phpunit tests for \Drupal\Core\Database\Connection.