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 #2338167 by alexpott, rbmboogie: Update ProjectInfo class to reflect changes to extension system

Issue #2546078 by ravenstar, albertski: Update report shows up-to-date modules with "color-error" style

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

Issue #2501683 by sclapp, kgoel, xjm, YesCT, josephdpurcell, stefan.r, izus, joelpittet: Remove SafeMarkup::set in _update_message_text()

Issue #1885564 by joelpittet, SebCorbin, Cottser, mpdonadio, David_Rothstein, drupalninja99, jenlampton, lauriii, rteijeiro, mbrett5062, akalata, Devin Carlson, trevorkjorlien, longwave, socketwench, shanethehat, aboros: theme.maintenance.inc (authorize.php) - Convert theme_ functions to Twig

Issue #2042447 by David_Rothstein, joelpittet, stefan.r, SebCorbin, mpdonadio, steinmb, webchick, Cottser, miniwebs2, Vj, Gilbert Rehling, nuwe, yched, StuartJNCC, Fabianx, yktdan, herom: Install a module user interface does not install modules (or themes)

Issue #2493911 by dawehner, larowlan, damiankloip, hussainweb, jibran, cilefen, benjy, iMiksu, mtdowling: Update guzzle, goutte and mink-goutte-driver to the latest release

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

Issue #2456521 by pjonckiere, mpdonadio, jhodgdon, rteijeiro, David_Rothstein, xjm: Add DateFormatter::formatDiff() as a non-buggy alternative to DateFormatter::formatInterval() when the start and end of the interval are known

Issue #2384675 by sidharrell, cilefen, Mile23, damiankloip, dawehner, Wim Leers, alexpott, neclimdul: Deprecate conf_path()

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 #2383871 by mgifford, rpayanm, a_thakur, maximpodorov, AohRveTPV, jhodgdon: Spellchecking Drupal - PHP

Issue #2413695 by joelpittet: Modules getting installed in the theme directory if they don't have a *.module file

This reverts commit a16cbda0.

Issue #1663206 by mortendk, aliyakhan, LewisNyman, Manuel Garcia, pakmanlh, rteijeiro, jwilson3: Update update.admin.css inline with our CSS standards

Issue #2091431 by ifrik, wzoom, batigolix, InternetDevels, jhodgdon: Update hook_help for Update Manager module

Issue #2448605 by martin107, willzyx, tim.plunkett, klausi, dpopdan: Replace usages of drupal_get_destination() with the redirect destination service

Issue #2448069 by a_thakur, JeroenT, Mile23: Remove usage and function update_project_storage() from update.compare.inc

Issue #2444231 by Wim Leers, nlisgo: Fix CacheableInterface so it makes sense (was: "Make Config objects & Entities implement CacheableInterface + add BubbleableMetadata::createFromCacheableObject()")

Issue #2459971 by Gábor Hojtsy: The langcode key on configuration files is not explicit in configuration schema

Issue #2457271 by rteijeiro, Palashvijay4O, Cottser: More cleanup of the 'themeable' documentation group

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2367747 by Palashvijay4O, andypost, Alienpruts, Cottser, er.pushpinderrana, gaurav.pahuja, pfrenssen, rpayanm, vadim.hirbu: Remove usage of system_rebuild_theme_data()

Issue #2384049 by suntog, mikemiles86, lokapujya, arpitr: Remove deprecated function _update_fetch_data and its usage

Issue #2435493 by effulgentsia: Change String::format()'s '@' and '%' placeholders to be auto-escaped rather than always-escaped

Issue #2384035 by arpitr, mikemiles86, lokapujya: Remove deprecated function _update_refresh and its usage