Issue #2363139 by Wim Leers, dawehner, larowlan: _content controllers may only return render arrays, not strings.
Issue #2221577 by andypost, alexpott, yched: Fix assumption that field settings is not a nested array.
Issue #2359879 by penyaskito, Gábor Hojtsy: Fixed Session negotiation settings cannot actually be changed on the UI.
Issue #2363741 by joelpittet: Upgrade Twig to 1.16.* from 1.15.*.
Issue #2039709 by dawehner, swentel, MantasK | jurcello: Fixed Forward slash in filter aliases in url alias overview doesn't work.
Issue #2364337 by penyaskito: Fixed $typedConfigManager dinamically defined in FieldConfigEntityUnitTest.
Issue #2363025 by Wim Leers, dawehner, larowlan: Push usage of drupal_set_page_content() higher: out of blocks and page display variants.
Issue #2307859 by rpayanm, dankh, shumer: Move theme-render hooks from system.api.php to theme.api.php
Issue #2360683 by martin107: Fix docs for WebTestBase::loggedInUser member variable
Issue #2364127 by Wim Leers: Merge AjaxResponseRenderer into AjaxController.
Issue #2315849 by Devin Carlson | Gábor Hojtsy: Update status does not have tests with (semantic) Drupal 8 versions.
Issue #184010 followup by stefank, seanr: Add #anchors to modules administration page.
Issue #2357925 by zaporylie | R. Volk: Fixed Duplicate view copies the old view name and ignores the new one.
Issue #2361599 by stefan.korn: Fixed menu_ui css file is not loaded.
Issue #2208811 by Pol, ivanjaros, dawehner: Fixed Views with arguments stopped working on front-end.
Issue #197641 followup by herom, good_man, yhager: Fixed Drag and drop is not RTL aware.
Issue #2349765 by derheap | davidhernandez: Copy taxonomy templates to Classy.
Issue #2261465 by rpayanm, neclimdul: Fixed Missing visibility keywords on DrupalKernelTest.
Issue #2276203 by webflo, lauriii, nlisgo, kallehauge, Snipon: Fixed CSS Aggregation breaks URLs with Query String.
Issue #2030645 by lokeoke, Mile23, tim.plunkett, miraj9093, slv_ | plopesc: Fixed Expand Menu with methods.