Issue #2548723 by Wim Leers, cwells: Comment on or replace class name cleaning in CKEditorPlugin/Internal::getButtons()

Issue #2561757 by Wim Leers, borisson_: Follow-up for #2443457: improve \Drupal\block\Tests\Views\DisplayBlockTest::testBlockEmptyRendering()

Issue #2529560 by John Cook, dawehner, Xano, lauriii, tim.plunkett, Wim Leers, nlisgo, Crell, plach, Fabianx: Expand support for link objects

Issue #2487592 by alexpott, JeroenT, Schnitzel, cilefen: CMI: don't ship with a default "active" directory that is empty in most Drupal installations

Issue #2563805 by andriyun, subhojit777, joshi.rohit100, naxolozano: Remove usage and function of test_page_test_page()

Issue #2429617 by Wim Leers, Fabianx, Berdir, yched, dawehner, effulgentsia, catch, borisson_, jhodgdon, martin107, torgosPizza: Make D8 2x as fast: Dynamic Page Cache: context-dependent page caching (for *all* users!)

Issue #2548991 by Wim Leers, Mile23: Remove Bartik's erroneous use of drupal_process_attached(), add tests

Issue #1854912 by seanB, bojanz, dermario, fubhy, jhedstrom: Don't assume that the array keys are entity id's in EntityStorageBase::delete()

Issue #2538950 by alexpott, dawehner, stefan.r: Replace SafeMarkup::format() in template_preprocess_html with placeholders in the template

Issue #1031122 by alexpott, greg.1.anderson, catch, sun, stefan.r, pwolanin: postgres changeField() is unable to convert to bytea column type correctly

Issue #2562487 by stefan.r, chx, tim.plunkett, dawehner, alexpott: Get better error reporting from __toString

Issue #2513556 by dcmul, mohit_aghera, cilefen, subhojit777, hussainweb, Bojhan, eliza411, ivanstegic, LewisNyman, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix, webchick: Add a link to the Block Layout page on the Appearance page

Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error

Revert "Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error"

This reverts commit c8702065.

Issue #1739846 by dawehner, Bès, DuaelFr, madhavvyas, damiankloip, aspilicious, fastangel, tim.plunkett, xjm: Tests taxonomy argument validator plugin

Issue #2463659 by andypost, Wim Leers, rpayanm, Fabianx, googletorp: Regression test coverage: integration test for an uncacheable menu link that depends on session data

Issue #2550287 by cilefen, hexabinaer, legolasbo, dawehner: Expand display "Comment" trim from 10 to 80 characters

Issue #2558615 by stefan.r: Error message in MySQL client version check shows server version instead of client version

Issue #2493989 by Antti J. Salminen, lauriii, slashrsm: template_preprocess() and other preprocess functions are called even for theme hooks implemented as functions

Issue #2349011 by Fabianx, Wim Leers: Support placeholder render strategies so contrib can support BigPipe, ESI…

Issue #2560411 by davidhernandez: The same CSS classes are being added to the field wrapper and field item

Issue #2555169 by TR: API documentation should not suggest using deprecated function format_string()

Issue #2542748 by plach: Follow-up to Automatic entity updates can fail when there is existing content, leaving the site's schema in an unpredictable state

Issue #1617918 by pfrenssen, tea.time: Test that no validation errors occur for anonymous users when $form['#token'] == FALSE