Issue #2520540 by alexpott: Enforced configuration dependencies shouldn't have to be repeated in the calculated dependencies

Issue #2454649 by Aki Tendo, dawehner: Cache Optimization and hardening -- [PP-1] Use assert() instead of exceptions in Cache::merge(Tags|Contexts)

Issue #2487025 by shellshocked59, harings_rob, rteijeiro, subhojit777, vijaycs85, ashutoshsngh, aburrows, swetashahi, mradcliffe, Wim Leers, lauriii, LewisNyman, Bojhan, DeeLay, B_man, davidhernandez, lizzjoy, lweinmeister, wizonesolutions, arh1, GenerUmali, tstoeckler: Remove contextual links in Seven

Issue #2572513 by ifrik, MattA, mdoedens, yoroy, jhodgdon: Update the hook_help for the block module again

Issue #2476947 by mdrummond, Wim Leers, davidhernandez, lauriii, joelpittet, andypost, Cottser, JeroenT, Manuel Garcia, rpayanm: Convert "title" page element into a block

Issue #2508884 by EclipseGc, tim.plunkett, dsnopek, japerry, sravya_12, swathin, Wim Leers, Fabianx, dawehner, yched: Make contexts immutable

Issue #2569703 by phenaproxima, benjy, webchick: When migrating to the same theme with different region names, block will not migrate properly

Issue #2567845 by LewisNyman, davidhernandez: [regression] Fix any visual regressions from moving the System CSS to Classy

Issue #2377757 by EclipseGc, tim.plunkett, Frando, Berdir, japerry, dsnopek, Wim Leers, Bojhan: Expose Block Context mapping in the UI

Issue #2560783 by stefan.r, joelpittet, lauriii, Cottser, Sutharsan, kgoel, justAChris, Gábor Hojtsy, dawehner, jhodgdon, effulgentsia, xjm, andypost, googletorp: Replace !placeholder with :placeholder for URLs in hook_help() implementations

Issue #2545972 by alexpott, joelpittet, ericjenkins, stefan.r, Wim Leers, Cottser: Remove all code usages SafeMarkup::checkPlain() and rely more on Twig autoescaping

Issue #2408165 by phenaproxima, miguelc303, quietone, eliza411, tim.plunkett, bdone, benjy: Migration Files for Drupal 7  Blocks

Issue #2566447 by stefan.r, joelpittet, alexpott, lauriii, dawehner: Cast safe string objects to string or use assertEqual() in some assertIdentical() comparisons

Issue #2567159 by joelpittet, effulgentsia, stefan.r, xjm, dawehner: Fix improper usage of t() in ViewsBlock

Issue #2538108 by dawehner, jhedstrom: Add hook_post_update_X() for data value updates to reliably run after data format updates

Issue #2396937 by legolasbo, Vj, subhojit777, jhodgdon: "Last placed block" color confusing in Block layout page

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

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

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

This reverts commit c8702065.

Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk, olli: Remove all usages SafeMarkup::checkPlain() from render arrays

Revert "Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk: Remove all usages SafeMarkup::checkPlain() from render arrays"

This reverts commit 31007609.

Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk: Remove all usages SafeMarkup::checkPlain() from render arrays

Issue #2504139 by borisson_, Wim Leers, plach, prashantgoel, Fabianx, dawehner, David_Rothstein, effulgentsia: Blocks containing a form include the form action in the cache, so they always submit to the first URL the form was viewed at

Issue #2382985 by phenaproxima, quietone, -enzo-, benjy: Migration Files for Drupal 7 Menu & Menu Entries

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

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

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

Issue #2559605 by Cottser, stefan.r: Convert SafeMarkup::checkPlain() in render arrays to #plain_text

Issue #2558247 by dawehner, catch, mradcliffe, jhedstrom, Berdir, jibran, effulgentsia, webchick: Remove rebuildAll() and module install from UpdatePathTestBase

Issue #2443457 by Wim Leers, dawehner, Berdir, giancarlosotelo, Jaesin: Views block displayed when no results returned

Issue #2555183 by jhedstrom, Gábor Hojtsy, mikeryan, stefan.r, xjm: Fix the filled update tests, they are broken

Issue #2522012 by phenaproxima, mikeryan, chx, benjy: Remove broken idlist handling, replace with more robust exception handling

Issue #2557253 by phenaproxima, neclimdul: MigrateFullDrupalTestBase test discovery gobbles all the memory