Issue #2169361 by plopesc: Convert COMMENT_HIDDEN & COMMENT_CLOSED & COMMENT_OPEN  to a constant on the comment field interface.

Issue #2205799 by cam8001, davidgrayston: PHPUnit should be configured to work consistently on all environments.

Issue #2171315 by sun, Xano, diarmy, tim.plunkett: Ensure a NULL container in UnitTestCase::setUp().

Issue #2201659 by ocsilalala, larowlan | andypost: Fix serialization of the forum manager and dependency on current_user service.

Issue #2203407 by nod_, sun: Replace #attached library array values with provider-namespaced strings.

Issue #2163203 by joelpittet, longwave, saki007ster: Remove calls to deprecated global $user wherever possible (outside bootstrap and authentication).

Issue #2170289 by plopesc, InternetDevels: Entity Display modes form allows to create machine names including dots.

Issue #558362 by aaronott, swentel, Jamesap, scor, Letharion, mtift, Dave.Ingram: Add test coverage for Field API Number.

Issue #2151119 by joelpittet, InternetDevels, jamesrutherford, Cottser, idflood, c4rl, IshaDakota, pplantinga, gnuget, longwave, jeanfei, sbudker1: Convert theme_system_themes_page() to Twig.

Issue #2152209 by longwave, joelpittet, steveoliver, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_fieldset() to Twig.

Issue #2152211 by joelpittet, IshaDakota, rteijeiro, steveoliver, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_form() to Twig.

Issue #2152203 by joelpittet, InternetDevels, rteijeiro,  steveoliver, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_container() to Twig.

Issue #2152225 by longwave, JeroenT, steveoliver, joelpittet, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_select() to Twig

Issue #2203853 by sidharthap, YesCT: Duplicate case 'name': unreachable in comment_tokens(), remove one.

Issue #2204129 by Wim Leers, tim.plunkett: Store the filter format on the editor entity during runtime.

Issue #2181527 by nod_, Wim Leers, sqndr: Contextual's toolbar toggle doesn't appear once the client-side cache is filled.

Issue #2114563 by joelpittet, martin107, Cottser: Remove TwigReference with the help of 'without' filter replacing 'show'/'hide' functions.

Revert "Issue #2210197 by sun, longwave: Remove public access to Extension::$type, ::$name, ::$filename." Broke 'drush en simpletest' on testbots

This reverts commit 2c51074d.