Issue #2521978 by kim.pepper: core/modules/system/src/Plugin/Condition/RequestPath should use the 'url.path' cache context

This reverts commit f3040e71.

Issue #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2548009 by larowlan, dawehner, bircher: Overridden menu links lose parent, expanded and enabled (are disabled) status on cache clear

Issue #2554151 by stefan.r, Gábor Hojtsy, plach, dawehner, csg: Test content/configuration in update database dump

Issue #2549393 by alexpott, dawehner, lauriii, andypost, xjm: Remove SafeMarkup::escape() and rely more on Twig autoescaping

Issue #2500717 by afi13, klonos, cilefen, evilfurryone: Sort entries in the site status report page alphabetically, BUT case-insensitively

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

Issue #2130307 by quietone, michaellenahan, phenaproxima, David Hernández, fastangel, eliza411: Variable to config: language.negotiation [d7]

Issue #2547933 by googletorp, jhodgdon: Code example for non deprecated use of entity_get_display is wrong

Issue #2550641 by damiankloip: Use assert() in Drupal\Core\DependencyInjection\Container::__sleep instead of trigger error

Issue #2547581 by Xano, dawehner, Berdir, alexpott: Missing configuration schemas for condition plugins

Issue #2547531 by sdstyles, mradcliffe: Fix documentation for FormTestBase::getMockForm form id parameter

Issue #1611954 by tim.plunkett, sun, samuel.mortenson, Berdir, mgifford, chx: Setting #access = FALSE on a vertical tab does not prevent input processing of the contained form elements

Issue #2513332 by stevector: NodeViewController::view() does not pass along its arguments when calling parent method

Issue #2455057 by michaellenahan, jhodgdon, jelo: Document (or set up?) fast 404 settings for private image files

Issue #2559969 by alexpott: Make SafeStringInterface extend \JsonSerializable so we don't have to do so much string casting

Issue #2543340 by Wim Leers, Fabianx: Convert BlockViewBuilder to use #lazy_builder (but don't yet let context-aware blocks be placeholdered)

Issue #2555911 by amitshah2007, sdstyles, pwlravikiran, mpdonadio: Incorrect indentation in TimestampAgoFormatter()

Issue #2457793 by claudiu.cristea, webflo: UX Regression in File- and ImageWidget, Table is always visible