Issue #1663166 by LewisNyman, Manuel Garcia, JamesLefrère, BarisW, sqndr, tompagabor: Clean up system admin css
Issue #2377115 by mglaman: Replace all instances of entity_load('field_config') and entity_load_multiple('field_config') with static method calls
Issue #2378055 by Gábor Hojtsy: Reorganise config schema for entity_form_display / entity_view_display
Issue #2376013 by pwolanin: Drupal 8 installer initially fails if settings.php and services.yml are correct, but config directories are absent
Issue #2372909 by Tom Verhaeghe: Comments to check '$comment->getOwner->isAnonymous()' instead of assuming anonymous is ID 0
Issue #1433796 by hampercm, claudiu.cristea, joshi.rohit100, gitesh.koli, undertext, yoroy, larowlan, rpayanm, opratr, jaffaralia, webbykat, nmudgal: Link to images styles from image field display settings
Issue #2378583 by tim.plunkett, EclipseGc: Core ContextAware Plugins have inconsistent ContextDefinition return docs
Issue #1855066 by Tom Verhaeghe, Wim Leers, benjifisher: In the "menu" toolbar tray, clicking/tapping white space should show the child level
Issue #2379083 by olli, Wim Leers: Regression (again): Menu contextual links no longer visible in menu blocks, when block caching is enabled
Issue #2378263 by Wim Leers: hook_library_alter() must be manually invoked by users of LibraryDiscovery, and has no test coverage
Issue #2346937 by dawehner, larowlan, Wim Leers, claudiu.cristea, msonnabaum: Implement a Renderer service; reduces drupal_render / _theme service container calls
Issue #2378585 by EclipseGc, tim.plunkett: Multiple context requirements cannot be satisfied by a single value
Issue #2374201 by YesCT: Docs and quote coding standard follow-up from: Incorrect logic in creating url to fetch information about project updates
Issue #2378329 by almaudoh: Update AccountProxyInterface::setAccount() documentation to point people to the account_switcher service
Issue #2376899 by Gábor Hojtsy: ImageFieldTestBase::createImageField() takes a description in field settings errorneously
Issue #2141417 by babruix, Sam152, jessebeach: Trays without headings throw a JavaScript error when the non-existent heading text is accessed
Issue #2328919 by Mile23, YesCT, tim.plunkett: Remove () from a bunch of @covers definitions in PHPUnit