Issue #2258831 by sun | Wim Leers: Stream wrappers of test runner are not restored after test completion.

Issue #2257427 by sun: Run-tests.sh builds + rebuilds two kernels from scratch for every PHP process.

Issue #2257769 by tstoeckler | sun: Adding an Entity Reference field in the Field UI throws a PHP notice; fails to add field.

Issue #1871762 by eojthebrave, jibran, xjm: Add detailed documentation explaining the block system's architecture.

Issue #2257283 by cs_shadow, filijonka: Fix obsolete references to form_set_error() in FormErrorInterface docs

Issue #2254495 by ParisLiakos, alexpott: Move language_admin_predefined_list to ConfigurableLanguageManager.

Issue #2250335 by drupaledmonk, pingwin4eg | jhodgdon: Forum hook_help still using URL instead of route.

Issue #1919916 by oadaeh, larowlan, jessehs, babruix: Change label of custom block default body field from "Block body" to just "Body".

Issue #2240463 by robertdbailey, balagan, holly.ross.drupal: Fix text: languages are not "enabled/disabled" anymore, they are added/removed.

Issue #2240007 by sun, YesCT, mr.baileys | Gábor Hojtsy: Regression: early installer is not in RTL after selecting RTL language.

Issue #1939008 by sun, joelpittet, gnuget, Gokul N K, sphism, drupalninja99, c4rl, Cottser, mdrummond, long wave, steveoliver, andypost, Fabianx | jenlampton: Convert theme_table() to Twig.