Issue #2208497 follow-up by chx: Another new Migrate maintainer.
Issue #2134857 by Xano: PHPUnit test the entity base classes.
Issue #2171071 by jessebeach, dawehner, chakrapani, longwave, Gábor Hojtsy, xjm, Wim Leers: Rename drupal_add_library() to _drupal_add_library() and remove its uses.
Issue #1817020 by paulh: Remove information about using upgrade.php to do major version upgrades from UPGRADE.txt
Issue #2209767 by bdone: Fix AjaxSubscriber @param datatype.
Issue #2205161 by jibran, rteijeiro | sun: Convert node.js into a library.
Issue #2214055 by sun: Programmed form submission does not get a triggering_element.
Issue #2202385 by martin107, kjay | LewisNyman: The “Skip to main content” link is not centered.
Issue #2214405 by jcfiala: Wrong @file comment in LinkItem.php.
Issue #2211621 by longwave, Kartagis: Spelling error in assertion message.
Issue #2213297 by longwave: Select::havingCompile() should not return a value.
Issue #2195915 by larowlan, andypost, jhodgdon: Cannot save text filter config using PostgreSQL if Comment is enabled [blocks installation!].
Issue #2209595 by ianthomas_uk: Remove drupal_set_title(), drupal_get_title() and associated tests.
Issue #2061397 by stevepurkiss, drupalninja99, giammi, baisong, manu4543: Remove unused local variables from the Views UI module.
Issue #2213605 by andypost: Rename EntityManager method buildBuildFieldDefinitions to buildBundleFieldDefinitions.
Issue #2213411 by jhodgdon: WebTestBase::drupalCreateNode() shouldn't imply you can set 'changed' time.
Issue #2148255 by jhodgdon: Make better D8 api.d.o landing page and put it in Core.
Issue #2194763 by nod_, Sam152 | dcrocks: 'back to site' button  doesn't work on site configured for 'dirty' url's.
Issue #2205157 by jibran, rteijeiro | sun: Convert locale.admin.css into a library.
Issue #2151089 by longwave, joelpittet, c4rl, IshaDakota, pplantinga, gnuget, jeanfei, sbudker1, Cottser: Convert theme_admin_block() to Twig.