Issue #2353679 by quietone, densolis, phenaproxima, ultimike: D6->D8 Migration missing variable: date_default_timezone

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

Issue #2552579 by alexpott: Remove SafeMarkup::placeholder(), deprecate drupal_placeholder() and stop drupal_placeholder() from marking safe

Issue #2349819 by amateescu, swentel, Leksat, larowlan, dawehner, Gábor Hojtsy, mpdonadio, benjy, jmuzz, yched, jibran, marthinal, dmsmidt: String field type doesn't consider empty string as empty value

Issue #2549791 by alexpott, Wim Leers: Remove SafeMarkup::xssFilter() and provide ability to define #markup escaping strategy and what tags to filter

Issue #1811240 by mgifford, heddn, BarisW, edysmp, Devin Carlson, jmuzz, lahoosascoots, adci_contributor, polaki_viswanath, RavindraSingh, falcon03, hrezaei, droplet: Improve "password matches" and "password strength" accessibility

Issue #2551335 by alexpott, Wim Leers: Remove unnecessary SafeMarkup usage in tests and clear the static cache before every run

Issue #2550823 by phenaproxima, neclimdul: Migrate Drupal integration tests should load all dump files

Issue #2550961 by borisson_, akalata, josephdpurcell, justAChris: Remove or document SafeMarkup::set in UserBlocksTest::testUserLoginBlock

Issue #2526326 by borisson_, Berdir, Wim Leers, Xano: Update CacheableMetadata & AccessResult to use RefinableCacheableDependency(Interface|Trait)

Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender

Revert "Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender"

This reverts commit 9ccb44e2.

Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender

Issue #2467863 by Dom., JesseSturgis, mgifford, LewisNyman, Cliff, benjifisher, heatherwoz, crasx: Login form's aria-describeby points to an element that doesn't exist

Issue #2455125 by mpdonadio, rteijeiro, jhodgdon, dawehner: Update EntityViewsData use of generic timestamp to use Field API formatter

Issue #2534042 by mikeryan, phenaproxima: Move module-specific migration support into the user module

Issue #2524082 by pfrenssen, Gábor Hojtsy, Wim Leers, Berdir, Fabianx, dawehner, catch: Config overrides should provide cacheability metadata

Issue #2525910 by dawehner, effulgentsia, Berdir, lauriii, larowlan, timmillwood, Wim Leers, chx, arlinsandbulte, Fabianx, Gábor Hojtsy, Dave Reid, alexpott, catch: Ensure token replacements have cacheability + attachments metadata and that it is bubbled in any case

Issue #2493033 by Berdir, Wim Leers, lauriii, Fabianx, effulgentsia, dawehner, catch, msonnabaum, Crell, webchick: Make 'user.permissions' a required cache context

Issue #2531258 by neclimdul: Improve \Drupal\Tests\user\Unit\PermissionHandlerTest::testBuildPermissionsSortPerModule

Issue #2321969 by rpayanm, subhojit777, prics, LinL, JeroenT, Temoor, prashantgoel, Mile23, pcambra, Sumi: Replace all instances of file_load(), file_load_multiple(), entity_load('file') and entity_load_multiple('file') with static method calls

Issue #2506195 by alexpott, joelpittet, xjm, David_Rothstein, Fabianx, pwolanin: Remove SafeMarkup::set() from Xss::filter()

Issue #2354889 by larowlan, dawehner, lauriii, Berdir, catch, martin107, pfrenssen, EclipseGc, Fabianx, Wim Leers, dsnopek, jibran, tim.plunkett, andypost: Make block context faster by removing onBlock event and replace it with loading from a ContextManager

Issue #2428861 by tbradbury, Nitesh Sethia, neetu morwani, deepakaryan1988, Sagar Ramgade, yogen.prasad, Daniel_Rose, Cottser, jhodgdon, Sutharsan, leeotzu: user.html.twig documentation refers to a nonexistent 'account' variable

Issue #2450993 by Wim Leers, Fabianx, Crell, dawehner, effulgentsia: Rendered Cache Metadata created during the main controller request gets lost

Issue #2478459 by plach, mkalkbrenner, chx, yched, Berdir, dawehner, benjy: FieldItemInterface methods are only invoked for SQL storage and are inconsistent with hooks

Issue #2502021 by willzyx, Saphyel, dawehner, DuaelFr, b0unty, cilefen, larowlan, lauriii: Unhandled exception when trying to register a duplicate user

Issue #2508627 by rvtraveller, pwolanin: Changing email address should invalidate one-time login links

Issue #2375695 by Berdir, EclipseGc, tim.plunkett, Wim Leers, Fabianx, dawehner: Condition plugins should provide cache contexts AND cacheability metadata needs to be exposed

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2511472 by Wim Leers, Fabianx, dawehner: Refactor all usages of drupal_render()/Renderer::render() that break #2450993