Issue #2849669 by alexpott, pwolanin, Munavijayalakshmi, dawehner: Fix \Drupal\Component\Utility\Unicode() because of the Symfony mbstring polyfill

Issue #2958744 by msankhala, joachim: hook_entity_field_access() should explain when $items is not given

Issue #2918535 by stella, Eli-T, webchick, smaz, ckrina, markconroy, kjay: Add initiative coordinator(s) for Out-of-the-Box

Issue #2969757 by marcel66, amateescu, alexpott: Fix "The Drupal\migrate\Plugin\migrate\process\Iterator is deprecated in Drupal 8.4.x and will be removed before Drupal 9.0.0. Instead, use Drupal\migrate\Plugin\migrate\process\SubProcess"

Issue #2469799 by Adita, Xano, Girish-jerk: improve documentation and type hinting of FormValidatorInterface and FormValidator

Issue #2950127 by owenbush, Yogesh Pawar, msankhala, Wim Leers, vaplas: Add helpful reason for 'update' and 'delete' access not being allowed to FileAccessControlHandler

Issue #2940830 by Sam152, catch, amateescu, timmillwood: Provide explicit test coverage for isDefaultRevisionPublished and its usage within ModerationStateFieldItemList

Issue #2924338 by hchonov, cburschka, RoSk0, asherry, Wim Leers: Entity::uriRelationships() throws exceptions if an URL cannot be generated because of missing mandatory parameters

Issue #2594669 by Wim Leers, borisson_, catch, dawehner: LibraryDependencyResolver::getMinimalRepresentativeSubset() accepts a set as the input but doesn't complain if it's not actually a set

Issue #2869825 by justafish, dawehner, alexpott, martin107, jibran, Lendude, Mixologic, michielnugter, droplet, drpal, lauriii, effulgentsia, mglaman: Leverage JS for JS testing (using nightwatch)

Issue #2935255 by Jo Fitzgerald, kim.pepper, voleger, alexpott, martin107, jibran, catch: Remove all usages of drupal_get_message and drupal_set_message in core lib

Issue #2969718 by runeasgar, alexpott: The quick-start script could make it clearer than Ctrl+C is used to kill the server

Issue #2970026 by digdanlow: Fix "Passing a Session object to the ExpectationException constructor is deprecated as of Mink 1.7. Pass the driver instead."

Issue #2969807 by jmikii: Fix "LinkField is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \Drupal\link\Plugin\migrate\field\d7\LinkField instead." deprecation message

Issue #2969549 by marcel66, martin107: Fix "The $published parameter is deprecated since version 8.3.x and will be removed in 9.0.0." deprecation

Issue #2969972 by mihai11: Fix "The Drupal\taxonomy\Entity\Term::getVocabularyId method is deprecated since version 8.4.0 and will be removed before 9.0.0. Use Drupal\taxonomy\Entity\Term::bundle() instead to get the vocabulary ID." deprecation message

Issue #2752961 by dawehner, Wim Leers, Jo Fitzgerald, chr.fritsch, bradjones1, anavarre, greg.1.anderson, Berdir, moshe weitzman, alexpott, bkosborne, Crell, msonnabaum, joelpittet, catch, deviantintegral, lauriii, cilefen, effulgentsia, xjm: No reliable method exists for clearing the Twig cache

Revert "Issue #2752961 by dawehner, Wim Leers, Jo Fitzgerald, bradjones1, chr.fritsch, greg.1.anderson, anavarre, Berdir, moshe weitzman, bkosborne, alexpott, Crell, catch, msonnabaum, lauriii, joelpittet, deviantintegral, cilefen, effulgentsia, xjm: No reliable method exists for clearing the Twig cache"

This reverts commit ada497ac.

Issue #2930445 by Alan D., mxh, Berdir: FieldItemListInterface::getEntity() should return FieldableEntityInterface rather than EntityInterface

Issue #2784921 by amateescu, timmillwood, pk188, plach, catch, Fabianx, dixon_, dawehner, borisson_, Sam152, yoroy, webchick, phenaproxima, larowlan: Add Workspaces experimental module

Issue #2752961 by dawehner, Wim Leers, Jo Fitzgerald, bradjones1, chr.fritsch, greg.1.anderson, anavarre, Berdir, moshe weitzman, bkosborne, alexpott, Crell, catch, msonnabaum, lauriii, joelpittet, deviantintegral, cilefen, effulgentsia, xjm: No reliable method exists for clearing the Twig cache

Issue #2954884 by msankhala: Cannot save theme settings form for themes without logo or favicon features

Issue #2911319 by alexpott, dawehner, mglaman, mradcliffe, heddn, pbirk, danquah, maxstarkenburg, geerlingguy, vaplas, Chelsee, ressa, Chi, jonathanshaw, Mile23, andypost, larowlan, phenaproxima, droffats, kim.pepper, scotty, dsnopek, cashwilliams, borisson_, Mixologic, gerzenstl, David Radcliffe: Provide a single command to install & run Drupal

Issue #2899248 by Sam152: Don't reimplement validation rules for workflow state add/edit forms in ::copyFormValuesToEntity

Issue #2428753 by borisson_, daffie, dawehner, franksj: Do not allow PHPUnit tests to test an interface

Issue #2938970 by MerryHamster, surbz, msankhala, alexpott, Jo Fitzgerald, Yasiru Nilan, Manuel Garcia, ZeiP, boaloysius, xjm, wturrell, tameeshb, darrenwh, ritzz: Replace drupal_render() in @param, @return, @see, @Link, etc

Issue #2873860 by Nikro, time2buzzthetower, mecmartini, tedbow: Add Change record for Revision Metadata Base Fields change to Annotation

Issue #2695945 by edurenye, ecrown, runeasgar: Reduce the size of the type of change column in the system diff