Issue #2762549 by alexpott, Fabianx, Mixologic, xjm: Drupal\field\Tests\Update\FieldUpdateTest, Drupal\views\Tests\Update\EntityViewsDataUpdateTest and Drupal\comment\Tests\CommentFieldsTest fail (cherry picked from commit 6c3ef7d2cef974d244773a53cd62b478b647aa21)
(cherry picked from commit 8a5abfc0)
(cherry picked from commit 7125a800)
(cherry picked from commit 41cab627)
(cherry picked from commit fdc09d31)
Revert "Issue #2485385 by phenaproxima, quietone, Berdir, blazey, hussainweb, mikeryan, benjy, alexpott: Move highwater field support to the source plugin, and do not expose its internals on MigrationInterface" This reverts commit 7c8ebc31.
Issue #2485385 by phenaproxima, quietone, Berdir, blazey, hussainweb, mikeryan, benjy, alexpott: Move highwater field support to the source plugin, and do not expose its internals on MigrationInterface (cherry picked from commit 0308eb77)
(cherry picked from commit 0c29f756)
Issue #2773333 by Berdir, Juterpillar, Wim Leers, Fabianx, renukakulkarni: Form validation errors, status messages on form submission are shown after page refresh when form is rendered in block (cherry picked from commit 2317a396)
(cherry picked from commit f3a83727)
Issue #2785891 by xjm, dawehner, tim.plunkett, alexpott, catch, YesCT, daffie, webchick: The distinctions between modules, themes, and other subsystems are not relevant in MAINTAINERS.txt or the issue queue component field (cherry picked from commit 21620006)
Issue #2539634 by Berdir, dawehner, cilefen, mpp, claudiu.cristea, amateescu, kristiaanvandeneynde: PathItem::delete() never runs because the path field type is a computed field in disguise (cherry picked from commit f3119f6a)
(cherry picked from commit dc509d0a)
Revert "Issue #2793443 by dawehner: Make private functions protected in BrowserTestBase/KernelTestBase" This reverts commit 82396ae7.
(cherry picked from commit 20119bb1)
Issue #2787187 by claudiu.cristea, grahl, azinck, Fabianx, dawehner: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity (cherry picked from commit c64a3f7d)
Revert "Issue #2787187 by claudiu.cristea, grahl, azinck: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity" This reverts commit 37e041d8.
Issue #2787187 by claudiu.cristea, grahl, azinck: Data loss: Deleting a translation of an entity deletes all file_usage entries for files referenced by the entity (cherry picked from commit a1b670fb)
(cherry picked from commit bde19066)
(cherry picked from commit 0e9422a3)
Issue #2760905 by anavarre, claudiu.cristea, amitaibu, dawehner: The documentation should be more explicit about PHPUnit requesting the webserver user to perform all functional tests (cherry picked from commit cf37e903)
Revert "Issue #2744197 by Boobaa, Wim Leers: Proper private file support for images uploaded via EditorImageDialog" This reverts commit 6e46381c.
(cherry picked from commit ed8ceb79)
(cherry picked from commit dd67ab2d)
(cherry picked from commit 97642595)