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

Issue #2504529 by joelpittet, alexpott, catch: SafeMarkup does not escape some filter tips - remove SafeMarkup usage from FilterHtml

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 #2521906 by mErilainen, LewisNyman, Bojhan, eliza411, ivanstegic, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix, webchick: Add default configuration to support h2-h6 level headings

Issue #2547741 by stefan.r, harjotsingh, sdstyles, Wim Leers: Introduce FilteredString and get rid of all SafeMarkup::set() calls in the Filter module

Issue #2384567 by phenaproxima, miguelc303, quietone, -enzo-, mikeryan, benjy, alexpott: Migration Files for Drupal 7 Text Formats & Filters

Issue #2546993 by mikeryan, phenaproxima: Move last stragglers of module-specific migrations into the appropriate modules

Issue #2529514 by dawehner, Fabianx, Wim Leers: Replace system.filter::protocols with container parameters

Issue #2506581 by alexpott, Wim Leers, Fabianx, xjm, joelpittet, Cottser, dawehner: Remove SafeMarkup::set() from Renderer::doRender

Issue #2351015 by plach, effulgentsia, Wim Leers, dawehner, martin107, damiankloip, cilefen, Fabianx, catch, pwolanin, Damien Tournoud, znerol, YesCT, larowlan: URL generation does not bubble cache contexts

Issue #2392109 by jacob.embree, dcmul, ByronNorris, jhedstrom: Filter: Allow plus sign in email addresses

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

Issue #2516802 by Dave Reid: FilterProcessResult->merge() results in PHP warning: Missing argument 1 for FilterProcessResult::__construct()

Issue #2453175 by tim.plunkett, plach, rteijeiro, effulgentsia, eshta, dawehner, fago, Berdir, alexpott: Remove EntityFormInterface::validate() and stop using button-level validation by default in entity forms

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

Issue #2408371 by dawehner, Fabianx, alexpott, bforchhammer: Proxies of module interfaces don't work

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

Issue #2392293 by bircher, tim.plunkett, alexpott, cilefen, gobinathm: Refactor hook_system_info_alter implementations to use ModuleUninstallValidatorInterface

Issue #2279105 by mgifford, nidaismailshah, thedavidmeister, amitgoyal, rpayanm, ameenkhan07, rakhimandhania, jhodgdon: Remove as many "..." and ellipsis characters from the codebase as possible without altering the meaning of text

Issue #2273925 by larowlan, aneek, lauriii, mikey_p, joelpittet, dimaro, Fabianx, xjm, jaredsmith, effulgentsia, lokapujya, iMiksu, chx, YesCT, googletorp, dawehner, Wim Leers, Cottser: Ensure #markup is XSS escaped in Renderer::doRender()

Issue #2478483 by Wim Leers, Fabianx: Introduce placeholders (#lazy_builder) to replace #post_render_cache

Issue #2489664 by sumitmadan, davidhernandez, Manjit.Singh, Cottser: Remove unnecessary markup from core templates, a.k.a. divitis

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2473105 by ifrik, jhodgdon, lostkangaroo, opratr, LinL: Update hook_help texts that link to modules that can be uninstalled

Issue #2383865 by mgifford, pguillard, rpayanm, alexpott, jhodgdon: Spellchecking Drupal - Javascript

Issue #2432791 by alexpott, vijaycs85, tim.plunkett, joshtaylor, Fabianx, Berdir, yched, bojanz: Skip Config::save schema validation of config data for trusted data.

Issue #2346209 by keopx, Zekvyrin, subhojit777, cburschka, pguillard, dimaro, realityloop, m4olivei, joelpittet, rteijeiro, idebr: /filter/tips improperly escaped