Issue #2503861 by phenaproxima, benjy, alexpott, mikeryan: Migrate file_managed table to file entities

Issue #2546176 by alexpott: Use SafeStrings to communicate safeness in drupal_set_message and remove SafeMarkup::set()

Issue #2502781 by tedstein, johnshortess, joelpittet, pwolanin, stefan.r, chx, mandclu, RavindraSingh, YesCT, cilefen, xjm, lauriii: Remove SafeMarkup::set in template_preprocess_file_widget_multiple()

Issue #2541336 by borisson_: Docblock cleanup: missing backslash for FilterResponseEvent in FinishResponseSubscriber

Issue #2538274 by pwolanin, Wim Leers, dawehner: DbUpdateController has broken mainteneance mode logic, and update.php doesn't run due to aggregated JS assets

Issue #1364670 by mondrake, mrfelton, dinarcon, das-peter, zuuperman, er.pushpinderrana, cchanana, drupaldrop, fietserwin: ImageStyle::transformDimensions unable to deal with all effects

Issue #2483357 by googletorp, floydm, darol100, alexpott, paulmckibben: Fatal "Unsupported operand types" error when using responsive images in views

Issue #2534010 by phenaproxima, mikeryan: Move module-specific migration support into the field module

Issue #2537928 by stefan.r, dawehner, alexpott, webflo, jhedstrom: MySQL index normalization only works on table create

Issue #2542304 by sorressean, dawehner: Define 'direction' in \Drupal\Core\Language\LanguageManager::getDefaultLockedLanguages

Issue #2172871 by iamEAP, timmillwood, effulgentsia: Test node hit counter when path-based language negotiation is used

Issue #2542762 by plach, sasanikolic, hchonov, Berdir: hook_entity_type_update doesn't get the entity in the new revision after addTranslation and setNewRevision

Issue #2473951 by Cottser, cilefen, yannickoo, davidhernandez, LewisNyman: Prefix form-required classes with js-

Broke HEAD. This reverts commit f9b5e683.

Issue #2535458 by mikeryan, benjy, phenaproxima, EclipseGc, dawehner: Dispatch events at key points during migration

Issue #2534004 by phenaproxima, mikeryan: Move module-specific migration support into the comment module

Issue #2534042 by mikeryan, phenaproxima: Move module-specific migration support into the user module