Issue #2048827 by claudiu.cristea, tim.plunkett: Move Image toolkit API from system.module to Drupal\Core.
Issue #2105123 by pwolanin: Add a currentUser() method to \Drupal\Core\Plugin\PluginBase.
Issue #2062017 by InternetDevels, rhm50, wesleydv, DeimoS: Replace user_access() calls with ->hasPermission() in rdf module.
Issue #2102499 by swentel, ianmthomasuk: Convert DiffEngine to settings.
Issue #2088241 by Xano: ConfigEntityInterface::setOriginalID() should return .
Issue #2091139 by mcrittenden, cosmicdreams: Fixed Duplicate array key comment_changed() in DefaultViewRecentComments.
Issue #2100323 by mondrake: Improve views UI preview tests.
Issue #2076551 by pfrenssen, pwolanin: Fixed SystemController::compactPage uses an invalid route name for the front page.
Issue #2080391 by johnmcc, Bladedu, chertzog, jeroen12345: Remove Unused local variables from multiple core files.
Issue #2100651 by dawehner, neclimdul: Fixed local task plugin id check for derivatives.
Issue #2089327 by thedavidmeister, Cyberschorsch: Remove / deprecate calls to drupal_strip_dangerous_protocols() use \Drupal\Component\Utility\Url::stripDangerousProtocols().
Issue #2099343 by damiankloip: Clean up Views relationship plugins.
Issue #1810330 by c4doug, plach, YesCT: Remove EntityTranslationControllerInterface::removeTranslation().
Issue #2106129 by mmilano: Fixed drupal_valid_path() Notice: Undefined variable: form_item().
Issue #2090139 by sidharthap, acausing: Fixed Warning: Illegal string offset 'callable' in rdf_rdfa_attributes() (line 181 of core/modules/rdf/rdf.module).
Issue #2057371 by nod_, phiit, Jelle_S: Fixed Re-Replace all $.each() with filtered for loop.
Issue #2101155 by andypost: Add CommentManagerInterface.
Issue #2061923 by likin, sergeypavlenko, pfrenssen, joelpittet: Remove calls to deprecated global  in locale module.
Issue #2105425 by damiankloip: Clean up Views join plugins.
Issue #1837998 by Bojhan, xjm, dawehner, David Hernández: Show the embed display in the UI.