Issue #2830485 by michielnugter, klausi, tedbow, xjm, catch, tim.plunkett, dawehner, alexpott, Wim Leers, Lendude: \Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest fails randomly

(cherry picked from commit f53358d2)

Issue #2721725 by Vinay15, snehi, zerbash, er.pushpinderrana, jhodgdon, xjm, Ashish.Dalvi, joachim, Kevin Davison, ckrina: Select form element has undocumented properties

(cherry picked from commit c6344b06)

Issue #2651328 by aerozeppelin, GeduR: Views Handler Filter InOperator exposed fires illegal choice when all option has been selected

(cherry picked from commit 1f0a6298)

Issue #2823955 by Jo Fitzgerald, benjy, quietone, claudiu.cristea, mikeryan: No need to specify operator for Vocabulary filter in Term source

(cherry picked from commit 08febd9a)

Issue #2836434 by alexpott, oriol_e9g, NickWilde, bradjones1, AdamPS, carteriii, gapple, tstoeckler, soulsymphonies: We should not ever recommend APC in Drupal 8

(cherry picked from commit e313a51e)

Issue #2828542 by claudiu.cristea, pfrenssen, cebasqueira, heddn, alexpott: Properly check if a destination folder for a file exists

(cherry picked from commit fb17ddf0)

Issue #2822296 by shashikant_chauhan, jp.stacey, xjm: Wrong fully qualified class name  \Drupal\Core\Routing\LinkGeneratorInterface::generate() in docs of Drupal::l()

(cherry picked from commit 38959d63)

Revert "Issue #2828438 by Adita, Sam152, rachel_norfolk, timmillwood, jp.stacey: Exception when adding tab to a node managed by content moderation"

This reverts commit debf5fcc.

Issue #2828438 by Adita, Sam152, rachel_norfolk, timmillwood, jp.stacey: Exception when adding tab to a node managed by content moderation

(cherry picked from commit debf5fcc)

Issue #2548713 by yongt9412, larowlan, Berdir, swentel, subhojit777, effulgentsia: Only one additional new value saved unlimited field and no non-field values are restored after preview

(cherry picked from commit f403ccb9)

Issue #2781927 by pguillard, kiamlaluno, Eda, kiwimind: Improve description of render array properties and examples

(cherry picked from commit aa036603)

Issue #2729663 by dmsmidt, thpoul, SKAUGHT, Wim Leers, Lendude, droplet, effulgentsia, xjm, Reinmar, alexpott: Fragment link pointing to <textarea> should be redirected to CKEditor instance when CKEditor replaced that textarea

Issue #2746671 by Jo Fitzgerald, stella, andrewmacpherson, hussainweb, tom friedhof, chriscalip, mikeryan: CCK field data not available for D7 taxonomy term migrations

(cherry picked from commit 98350348)

Issue #2835604 by Wim Leers, effulgentsia: BigPipe provides functionality, not an API: mark all classes & interfaces @internal

(cherry picked from commit 074f9fcb36b6e7be266c01aa718437e344860e84)

(cherry picked from commit 7c89385360b8842a5a7444b8641634ed1d9716a7)

Issue #2829759 by ruloweb: Wrong @return doc comment in \Drupal\user\Controller\UserAuthenticationController.php

(cherry picked from commit 2ccc8338)

(cherry picked from commit 27890385)

Issue #2830333 by Wim Leers, tedbow: All REST update path test coverage fixtures contain no-op code and other mistakes

(cherry picked from commit c1325dae)

(cherry picked from commit 240406a7)

Issue #2828559 by amateescu, alexpott: More random fails in UpdatePathTestBase tests: "settings.cache failed with: missing schema"

(cherry picked from commit 5e5ef246)

Issue #2130277 by phenaproxima, michaellenahan, Jo Fitzgerald, David Hernández, hardik.p, fastangel, alvar0hurtad0: Variable to config: filter.settings [D7 only]

(cherry picked from commit da0c4fa4)

Issue #2826200 by claudiu.cristea, pfrenssen: Don't let the whole migration crash on a download failure

(cherry picked from commit 08188595e5425d33460a18f31ca9c893b5d66978)

(cherry picked from commit bf02c1b1)

Issue #2814035 by klausi, dawehner: Make $modules property protected on BrowserTestBase and KernelTestBase

(cherry picked from commit b33af7a9)

Issue #2833462 by alexpott, tim.plunkett, Berdir: hook_requirements($phase = 'install') does not work as expected for experimental modules

(cherry picked from commit 37c07a73)

Issue #2726803 by hussainweb, jmuzz, Jo Fitzgerald: Field formatters with names different than their field type can not be migrated

(cherry picked from commit fbafc692)

(cherry picked from commit 222fa031)

Issue #2717969 by Wim Leers, benelori, dawehner: REST views: Views field is not displayed as token, if exclude flag is set and the display is RestExport

(cherry picked from commit 9d095b94)

Issue #2827656 by maxocub, aditya.n: Once a process plugin returns multiple values, all following plugins are expected to handle multiple values

(cherry picked from commit e2d2372a00aefff8b192527861011c803a9ab251)

Issue #2756401 by claudiu.cristea, pfrenssen, sandervd, gielfeldt, alexpott, amateescu, dawehner: EntityAutocomplete form element validation is too strict

(cherry picked from commit 729340a8)

Issue #2698909 by Berdir, andypost, jibran, tim.plunkett, lauriii, tstoeckler, dawehner: EntityViewBuilder uses non-existing #theme hooks

(cherry picked from commit 408f00c3)

(cherry picked from commit 892272e7)

(cherry picked from commit 2c0f8828)

Issue #2810621 by Gábor Hojtsy, dawehner, xjm, jhodgdon, klausi, Wim Leers: Improve core.api.php documentation about browsertests and javascript tests

(cherry picked from commit ea1bc99c)

Issue #2830485 by klausi, catch, michielnugter: \Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest fails randomly

(cherry picked from commit ce52d334)

Issue #2811841 by hchonov, tstoeckler, Berdir: Add test coverage ensuring user input is mapped on the correct form elements when elements are reordered

(cherry picked from commit 740ccca3)

Issue #2832013 by Wim Leers, michielnugter, catch: CommentResourceTestBase::testPostDxWithoutCriticalBaseFields() always fails on PHP 5.6 & MySQL 5.5 (works fine on other PHP versions)

(cherry picked from commit f7aed207)

Issue #2824576 by Wim Leers: Delete old REST test coverage: (Read|Create|Update|Delete)Test, deprecate RESTTestBase