Issue #1817672 by jibran, dawehner, bdgreen, damiankloip: Replace db_select() with an injected database connection in views plugins.

Issue #843708 by mgifford, dawehner: Add option to set caption & remove summary in the html table (Accessibility).

Issue #2014009 by kgoel: Replace drupal_container() with Drupal::service() in the serialization module.

Issue #2003568 by dawehner, jhedstrom: Convert tags,attributes, diff and url validation unit tests to phpunit.

Issue #1924436 by JohnAlbin, rteijeiro: Remove separate CSS_AGGREGATE_SYSTEM aggregate file and fix drupal_add_library() to aggregate CSS properly.

Issue #1657886 by Hanno: Filter 'Convert URLs into links; doesn't support multilingual web addresses.

Issue #1826252 by Jeroen, benjf, wilco: Domain language negotiation broken when a base url is configured.

Issue #2019481 by nod_: JavaScript AJAX commands object is borked: it is shared among all Drupal.ajax instances, preventing scoped overrides.

Issue #1899486 by Gábor Hojtsy, YesCT, Schnitzel, pixelite, sahain: Make link for translating content always say translate instead of translations

Issue #2009092 by smiletr: Fix up documentation for field_attach_view(), which was inaccurate for D8

Issue #1971860 by arh1, shanethehat, Fabianx: Document that Twig debug mode can cause automated tests to fail

Issue #2004408 followup by alexpott: Allow modules to alter the result of EntityListController::getOperations.

Issue #2005616 by mikeker: Views should use ['#attached']['library'] rather than ['#attached']['css'].