RELEASE-NOTES-1.31

   1 == MediaWiki 1.31.2 ==
   2
   3 THIS IS NOT A RELEASE YET
   4
   5 === Changes since MediaWiki 1.31.1 ===
   6 * (T204729) WatchedItemStore::countVisitingWatchersMultiple() shouldn't query all
   7   titles when asked for none
   8 * (T205967) Fix syntax error typo in postgres database upgrade file.
   9 * (T200254) Add pear/Net_SMTP 1.7.3 to composer dependencies.
  10 * (T206765) Load installer i18n when running update.php.
  11 * (T109121) Remove deprecated pear/mail_mime-decode from composer suggested libraries.
  12   [Also in the bundled composer /vendor directory.]
  13 * Various PHP 7.2 and 7.3 compatibility fixes:
  14   * (T200595, T206974) Fix PHP 7.3 warnings of using "continue" in some scenarios instead
  15     of "break".
  16     * (T206976, T206977) Also in the bundled LocalisationUpdate and ParserFunctions extensions.
  17   * (T206979) Fix PHP 7.3 warnings of using "compact()" when some variables may
  18     not be set.
  19   * Fix PHP 7.3 warnings "preg_replace(): [...] invalid range in character class"
  20   * Avoid PHP 7.2 warnings in DBConRefTest about count() on non-Countable
  21   * Suppress "Headers already sent" in PHP 7.2 too
  22   * (T206476) Output only to stderr in unit tests
  23   * (T207112) Add session_write_close() calls to SessionManager tests
  24 * (T207540) Include IP address in "Login for $1 succeeded" log entry.
  25 * (T201781) Database: Allow selectFieldValues() to accept SQL fragments
  26 * (T205765) installer: Don't link to the obsolete "Extension Matrix" page
  27 * (T206013) Update ImportableUploadRevisionImporter for interwiki usernames
  28 * (T207541) Pass an email address, not a MailAddress, to mail().
  29 * (T207603) User JS may no longer be loaded with mime type text/javascript if
  30   there is no account associated with the username.
  31 * (T112937, T113042) Do not allow loading pages raw with a text/javascript MIME
  32   type if non-admins can edit the page.
  33 * (T17491) <ins>/<del> elements can be phrasing or flow
  34 * (T200827) RemexCompatMunger: Don't call endTag() in case B/b
  35 * (T207088) Upgrade wikimedia/remex-html to 2.0.1
  36   [Also in the bundled composer /vendor directory.]
  37 * (T194052) Updated wikimedia/base-convert from 1.0.1 to 2.0.0.
  38   [Also in the bundled composer /vendor directory.]
  39 * (T199494) Fix notices in maintenance/removeUnusuedAccounts.php
  40 * Require ext-fileinfo in composer.json, per PHPVersionCheck
  41 * (T176390) Bundled LocalisationUpdate extension: Handle exceptions from GitHubFetcher
  42 * (T208255) Completion search should not change the search query
  43 * (T209870) Fix SQL syntax error in MS-SQL initialisation file for new wikis
  44 * (T185049) LogFormatter: Fail softer when trying to link an invalid titles
  45 * (T210998) Properly set $wgLanguageCode in the generated LocalSettings.php
  46   if --lang is used with the command-line installer (install.php).
  47
  48 == MediaWiki 1.31.1 ==
  49
  50 This is a security and maintenance release of the MediaWiki 1.31 branch.
  51
  52 === Changes since MediaWiki 1.31.0 ===
  53 * (T169545, CVE-2018-0503) SECURITY: $wgRateLimits entry for 'user' overrides
  54   'newbie'.
  55 * (T194605, CVE-2018-0505) SECURITY: BotPasswords can bypass CentralAuth's
  56   account lock.
  57 * (T199029, CVE-2018-13258) SECURITY: Tarball was missing .htaccess files.
  58 * (T197229) Bundle Nuke extension, it was accidentally omitted.
  59 * (T193995) Fix undefined patchPath() method call in parser tests.
  60 * (T198687) Fix various selectFields methods to use the string 'NULL', not null.
  61 * Special:BotPasswords now requires reauthentication.
  62 * (T191608, T187638) Add 'logid' parameter to Special:Log.
  63 * (T193829) Indicate when a Bot Password needs reset.
  64 * (T198037) GitInfo: Don't try shelling out if it's disabled.
  65 * (T151415) Log email changes.
  66 * (T197206) Fix performance regression when multiple DB used without caching.
  67 * (T197030) PHPSessionHandler: Suppress headers warnings in initialize().
  68 * (T182377, T196793) Exif: Guard against uncountable tag values.
  69 * (T200861) Fix total breakage of SQLite web upgrade.
  70 * (T200864) Fix pingback over-reporting on non-MySQL databases
  71 * (T202550) Unbreak SpecialListusersHeaderForm and SpecialListusersHeader
  72   hooks.
  73
  74 === Changes since MediaWiki 1.31.0-rc.2 ===
  75 * (T195783) Initialize PSR-4 namespaces at same stage as normal autoloader.
  76 * (T196092) Hide MySQL binary/utf-8 charset option in the installer.
  77 * (T196185) Don't allow setting $wgDBmysql5 in the installer.
  78 * (T196125) php-memcached 3.0 (provided with PHP 7.0) is now supported.
  79 * (T182366) UploadBase::checkXMLEncodingMissmatch() now works on PHP 7.1+
  80 * (T118683) Fix exception from &$user deref on HHVM in the TitleMoveComplete hook.
  81 * (T196672) The mtime of extension.json files is now able to be zero
  82 * (T180403) Validate $length in padleft/padright parser functions.
  83 * (T143790) Make $wgEmailConfirmToEdit only affect edit actions.
  84
  85 === Changes since MediaWiki 1.31.0-rc.0 ===
  86 * (T33223) Drop archive.ar_text and ar_flags.
  87 * Add default edit rate limit of 90 edits/minute for all users.
  88 * (T187645) Use codepoint as tiebreaker when getting first-letters in
  89   IcuCollation.
  90 * (T191947) Don't shell during the installer if shelling out is disabled.
  91 * (T194319) Improve duplicate config setting exception as part of extension
  92   registration.
  93 * (T195211) Don't require trailing slash in PSR-4 autoloader directory.
  94 * (T186565) Fix PHP Notice from `ob_end_flush()` in `FileRepo::streamFile()`.
  95 * Do not incorrectly hide namespace input field in the installer.
  96 * (T186456) Refactor checks looking for PEAR maik libraries to be clearer.
  97
  98 === Important pre-upgrade notes for 1.31 ===
  99 * If you're using MySQL, SQLite, or MSSQL, are not using update.php to apply
 100   schema changes, and cannot have downtime to run migrateArchiveText.php and
 101   apply patch-drop-ar_text.sql manually, you'll have to apply a default value
 102   to the ar_text and ar_flags columns of the archive table or make those
 103   columns nullable before upgrading to MediaWiki 1.31.
 104   maintenance/archives/patch-nullable-ar_text.sql shows how to do this for MySQL.
 105 * The CologneBlue and Modern skins are no longer bundled with the tarball. You
 106   will need to remove the wfLoadSkin() calls from your LocalSettings.php or
 107   download them separately
 108   (<https://www.mediawiki.org/wiki/Special:SkinDistributor>).
 109
 110 === Configuration changes in 1.31 ===
 111 * $wgEnableAPI and $wgEnableWriteAPI are now deprecated and will be removed in
 112   a future version. The API is now considered to be stable, secure and
 113   essential.
 114 * $wgUsejQueryThree was removed, as it is now the default. This was documented
 115   as a temporary variable during the migration period, deprecated since 1.29.
 116 * $wgLogoHD has been updated to support svg images and uses $wgLogo where
 117   possible for fallback images such as png.
 118 * (T44246) $wgFilterLogTypes will no longer ignore 'patrol' when user does not
 119   have the right to mark things patrolled.
 120 * Wikis that contain imported revisions or CentralAuth global blocks should run
 121   maintenance/cleanupUsersWithNoId.php.
 122 * The configuration settings $wgResourceLoaderMinifierStatementsOnOwnLine and
 123   $wgResourceLoaderMinifierMaxLineLength, deprecated since 1.27, were removed.
 124 * (T180921) $wgReferrerPolicy now supports having fallbacks for browsers that
 125   are not using the latest version of the Referrer Policy specification.
 126 * $wgFragmentMode is now set to [ 'legacy', 'html5' ] by default. This is a
 127   first step of migration to human-readable section IDs that will later result
 128   in 'html5' being the default mode.
 129 * CACHE_ACCEL now only supports APC(u) or WinCache. XCache support was removed
 130   as upstream is inactive and has no plans to move to PHP 7.
 131 * The old CategorizedRecentChanges feature, including its related configuration
 132   option $wgAllowCategorizedRecentChanges, has been removed.
 133 * (T188472) The 'comma' value for $wgArticleCountMethod is no longer supported
 134   for performance reasons, and installations with this setting will now work as
 135   if it was configured with 'any'.
 136 * (T185753) MediaWiki now defaults to using RemexHtml to tidy up user input,
 137   rather than being off by default. If you wish to disable HTML tidying
 138   entirely, set $wgTidyConfig to null; if you wish to use the old, deprecated
 139   Tidy external binary, both set $wgTidyConfig to null and $wgUseTidy to true.
 140 * $wgLogAutopatrol now defaults to false instead of true.
 141 * $wgValidateAllHtml was removed and will be ignored.
 142 * $wgScriptExtension, deprecated and ignored since 1.25, was removed. See the
 143   1.25 release notes for more information.
 144 * $wgUseAjax is now marked as deprecated, just like the deprecated AJAX
 145   framework that it enables. Some extensions mistakenly used this to check
 146   whether any AJAX functionality at all should be enabled, further making this
 147   problematic to retain.
 148 * $wgDBmysql5 is now deprecated, and will be removed in a future version. It
 149   has been marked as experimental ever since it was introduced.
 150
 151 === New features in 1.31 ===
 152 * (T76554) User sub-pages named ….json are now protected in the same way that
 153   ….js and ….css pages are, so that configuration options can safely be placed
 154   there.
 155 * Wikimedia\Rdbms\IDatabase->select() and similar methods now support joins
 156   with parentheses for grouping.
 157 * As a first pass in standardizing dialog boxes across the MediaWiki product,
 158   Html class now provides helper methods for messageBox, successBox, errorBox
 159   and warningBox generation.
 160 * (T9240) Imports will now record unknown (and, optionally, known) usernames in
 161   a format like "iw>Example".
 162 * (T20209) Linker (used on history pages, log pages, and so on) will display
 163   usernames formed like "iw>Example" as interwiki links, as if by wikitext like
 164   [[iw:User:Example|iw>Example]].
 165 * (T111605) The 'ImportHandleUnknownUser' hook allows extensions to auto-create
 166   users during an import.
 167 * Added a hook, ParserOutputPostCacheTransform, to allow extensions to affect
 168   the ParserOutput::getText() post-cache transformations.
 169 * Added a hook, UploadForm:getInitialPageText, to allow extensions to alter the
 170   initial page text for file uploads.
 171 * (T181651) The info page for File pages now displays the file's base-16 SHA1
 172   hash value in the table of basic information.
 173 * Style tags with a 'data-mw-deduplicate' attribute will be deduplicated as a
 174   ParserOutput::getText() post-cache transformation. This may be disabled by
 175   passing 'deduplicateStyles' => false to that method.
 176 * The identity of the logged-in or IP "actor" for logged actions is being moved
 177   into a new actor table, with the rows in tables such as revision and logging
 178   referring to the actor ID instead of storing the user ID and name/IP in
 179   every row.
 180   * This is currently gated by $wgActorTableSchemaMigrationStage. Most wikis
 181     can set this to MIGRATION_NEW and run maintenance/migrateActors.php as
 182     soon as any necessary extensions are updated.
 183   * Most code accessing rows for logged actions from the database should use
 184     the relevant getQueryInfo() methods to get the information needed to build
 185     the SQL query. The ActorMigration class may also be used to get feature
 186     -flagged information needed to access actor-related fields during the
 187     migration period.
 188 * Added Wikimedia\Rdbms\IDatabase::cancelAtomic(), to roll back an atomic
 189   section without having to roll back the whole transaction.
 190 * Wikimedia\Rdbms\IDatabase::doAtomicSection(), non-native ::insertSelect(),
 191   and non-MySQL ::replace() and ::upsert() no longer roll back the whole
 192   transaction on failure.
 193 * (T189785) Added a monthly heartbeat ping to the pingback feature.
 194 * The CLI installer (maintenance/install.php) learned to detect and include
 195   extensions. Pass --with-extensions to enable that feature.
 196 * (T184791) rc_patrolled now has three states: "0" for unpatrolled,
 197   "1" for manually patrolled and "2" for autopatrolled actions.
 198 * Extensions can now set their type to "editor" if they provide an editor or
 199   enhance the editing experience.
 200 * Extensions can use a PSR-4 autoloader by setting an "AutoloadNamespaces"
 201   property in extension.json. See the documentation at
 202   <https://mediawiki.org/wiki/Manual:Extension.json/Schema#AutoloadNamespaces>
 203   for more details and an example.
 204 * (T19099) Tabs which link to pages that don't exist (like those to uncreated
 205   discussion pages) now have a tooltip to indicate state, not just colour.
 206
 207 === External library changes in 1.31 ===
 208 * pear/mail, pear/mail_mime and pear/mail_mime-decode have been moved from
 209   suggested to required. These packages now must be installed via composer
 210   and not via PEAR itself.
 211
 212 ==== Upgraded external libraries ====
 213 * Updated jquery.chosen from v0.9.14 to v1.8.2.
 214 * Updated composer/spdx-licenses from 1.1.4 to 1.3.0 (development dependency).
 215 * Updated nikic/php-parser from 2.1.0 to 3.1.3 (development dependency).
 216 * Updated wikimedia/ip-set from 1.1.0 to 1.2.0.
 217 * Updated wikimedia/relpath from 2.0.0 to 2.1.1.
 218 * Updated wikimedia/running-stat from 1.1.0 to 1.2.0.
 219 * Updated wikimedia/wrappedstring from 2.2.0 to 2.3.0.
 220 * Updated mediawiki/at-ease from 1.1.0 to 1.2.0.
 221 * Updated wikimedia/php-session-serializer from 1.0.4 to 1.0.6.
 222 * Updated wikimedia/remex-html from 1.0.2 to 1.0.3.
 223 * Updated wikimedia/html-formatter from 1.0.1 to 1.0.2.
 224
 225 ==== New external libraries ====
 226 * Added wikimedia/object-factory 1.0.0
 227
 228 ==== Removed and replaced external libraries ====
 229 * (T17845) The deprecated 'jquery.badge' module was removed.
 230 * The deprecated 'jquery.autoEllipsis' module was removed. Use the CSS
 231   text-overflow property instead.
 232 * The deprecated 'jquery.placeholder' module was removed.
 233 * The deprecated 'jquery.appear' module was removed. Use the
 234   'mediawiki.viewport' module instead.
 235 * mediawiki/at-ease was replaced with wikimedia/at-ease.
 236
 237 === Bug fixes in 1.31 ===
 238 * (T90902) Non-breaking space in header ID breaks anchor.
 239 * (T189375) CSSMin now allows quoted urls in `url()` syntax to start with a
 240   space.
 241 * (T2087, T10897, T87753, T174639) Whitespace created by category and language
 242   links is now stripped rather than leaving blank lines in odd places.
 243 * (T3780) Uploads with UTF-8 names now work on PHP7.1+ on Windows servers.
 244 * (T182366) UploadBase::checkXMLEncodingMissmatch() now works on PHP 7.1+
 245
 246 === Action API changes in 1.31 ===
 247 * (T185058) The 'name' value to tgprop for action=query&list=tags has been
 248   removed. It has never made a difference in the output, the name was always
 249   returned regardless.
 250 * The 'watch' and 'unwatch' parameters for action=move have been removed. They
 251   were deprecated and also accidentally nonfunctional since 1.17 in 2010. Use
 252   'watchlist' instead.
 253
 254 === Action API internal changes in 1.31 ===
 255 * ApiBase::getProfileDBTime, deprecated since 1.25, was removed.
 256 * ApiBase::getModuleProfileName, deprecated since 1.25, was removed.
 257 * ApiBase::getProfileTime, deprecated since 1.25, was removed.
 258
 259 === Languages updated in 1.31 ===
 260 MediaWiki supports over 350 languages. Many localisations are updated
 261 regularly. Below only new and removed languages are listed, as well as
 262 changes to languages because of Phabricator reports.
 263
 264 * (T180052) Mirandese (mwl) now supports gendered NS_USER/NS_USER_TALK.
 265 * (T182305) New language support: Nyungar (nys).
 266 * (T186359) New language support: Siberian Tatar [cебертатар] (sty).
 267 * (T186635) New language support: Guianan Creole (gcr).
 268 * (T186647) New language support: Kumyk [къумукъ] (kum).
 269 * (T187750) New language support: Spanish formal address (es-formal).
 270 * (T187824) New language support: Hungarian formal address (hu-formal).
 271 * (T189127) New language support: Gorontalo (gor).
 272
 273 === Breaking changes in 1.31 ===
 274 * MessageBlobStore::insertMessageBlob(), deprecated in 1.27, was removed.
 275 * The OutputPage class constructor now requires a context parameter.
 276   Instantiating without context was deprecated in 1.18.
 277 * The mw.page JavaScript singleton, deprecated in 1.30, was removed.
 278 * Article::getLastPurgeTimestamp(), WikiPage::getLastPurgeTimestamp(), and the
 279   related WikiPage::PURGE_* constants, deprecated in 1.29, were removed.
 280 * The Article::selectFields(), ::onArticleCreate(), ::onArticleDelete(), and
 281   ::onArticleEdit() methods, deprecated in 1.24, were removed.
 282 * Installer::locateExecutable() and ::locateExecutableInDefaultPaths() were
 283   removed. Use ExecutableFinder::findInDefaultPaths() instead.
 284 * The deprecated MW_DIFF_VERSION constant was removed.
 285   DifferenceEngine::MW_DIFF_VERSION should be used instead.
 286 * Due to significant refactoring, method ContribsPager::getUserCond() that had
 287   no access restriction has been removed.
 288 * The Block class will no longer accept usable-but-missing usernames for
 289   'byText' or ->setBlocker(). Callers should either ensure the blocker exists
 290   locally or use a new interwiki-format username like "iw>Example".
 291 * The following methods and constants from the WatchedItem class, which were
 292   deprecated in 1.27, have been removed:
 293   * WatchedItem::getTitle()
 294   * WatchedItem::fromUserTitle()
 295   * WatchedItem::addWatch()
 296   * WatchedItem::removeWatch()
 297   * WatchedItem::isWatched()
 298   * WatchedItem::duplicateEntries()
 299   * WatchedItem::IGNORE_USER_RIGHTS
 300   * WatchedItem::CHECK_USER_RIGHTS
 301   * WatchedItem::DEPRECATED_USAGE_TIMESTAMP
 302 * The $statementsOnOwnLine parameter of JavaScriptMinifier::minify was removed.
 303   $wgResourceLoaderMinifierStatementsOnOwnLine, the corresponding configuration
 304   variable, has been deprecated since 1.27 and was removed as well.
 305 * The $maxLineLength parameter of JavaScriptMinifier::minify was removed.
 306   $wgResourceLoaderMinifierMaxLineLength, the corresponding configuration
 307   variable, has been deprecated since 1.27 and was removed as well.
 308 * The HtmlFormatter class, deprecated in 1.27, was removed. The namespaced
 309   HtmlFormatter\HtmlFormatter class should be used instead.
 310 * The driver 'mysql' for MySQL, deprecated in MediaWiki 1.30, has been removed.
 311   The driver has been deprecated since PHP 5.5 and was removed in PHP 7.0. The
 312   default driver for MySQL has been 'mysqli' since MediaWiki 1.22.
 313 * The following properties of PreparedEdit were deprecated in 1.21 and have
 314   been removed:
 315   * PreparedEdit->newText
 316   * PreparedEdit->oldText
 317   * PreparedEdit->pst
 318 * ParserOutput objects which are generated using a non-default value for
 319   ParserOptions::setWrapOutputClass() can no longer be added to the parser
 320   cache.
 321 * The following deprecated methods from the OutputPage class have been removed:
 322   * OutputPage::addExtensionStyle(); deprecated in 1.27
 323   * OutputPage::getExtStyle(); deprecated in 1.27
 324   * OutputPage::setETag(); deprecated in 1.28 (obsolete no-op)
 325   * OutputPage::setSquidMaxage(); deprecated in 1.27
 326   * OutputPage::readOnlyPage(); deprecated in 1.25
 327   * OutputPage::rateLimited(); deprecated in 1.25
 328   * Additionally, the protected OutputPage::$mExtStyles array, only accessed
 329     through the above and with no known uses, was removed.
 330 * The no-op method Skin::showIPinHeader(), deprecated in 1.27, was removed.
 331 * The following variables and methods in EditPage, deprecated in MediaWiki 1.30,
 332   were removed:
 333   * $isCssJsSubpage — use ::isUserConfigPage()
 334   * $isCssSubpage — use ::isUserCssConfigPage()
 335   * $isJsSubpage — use ::isUserJsConfigPage()
 336   * $isWrongCaseCssJsPage – use ::isWrongCaseUserConfigPage()
 337   * ::getSummaryInput() – use ::getSummaryInputWidget()
 338   * ::getSummaryInputOOUI() – use ::getSummaryInputWidget()
 339   * ::getCheckboxes() – use ::getCheckboxesWidget() or
 340       ::getCheckboxesDefinition()
 341   * ::getCheckboxesOOUI() – use ::getCheckboxesWidget() or
 342       ::getCheckboxesDefinition()
 343 * ResourceLoaderModule::getPosition(), deprecated in 1.29, has been removed.
 344 * In User, the cookie-related methods which were wrappers for the functions on
 345   the response object, and were deprecated in 1.27, have been removed:
 346   * ::setCookie()
 347   * ::clearCookie()
 348   * ::setExtendedLoginCookie()
 349   Note that User::setCookies() remains, and is not deprecated.
 350 * Also in User, some auth-related methods which were deprecated in 1.27 have
 351   been removed:
 352   * ::getEditTokenTimestamp() – use MediaWiki\Session\Token::getTimestamp()
 353   * ::getPasswordFactory() – create a PasswordFactory directly
 354   * ::passwordChangeInputAttribs()
 355 * The global functions wfProfileIn and wfProfileOut, deprecated in 1.25, have
 356   been removed.
 357 * SpecialPageFactory::getList(), deprecated in 1.24, has been removed. You can
 358   use ::getNames() instead.
 359 * OpenSearch::getOpenSearchTemplate(), deprecated in 1.25, has been removed. You
 360   can use ApiOpenSearch::getOpenSearchTemplate() instead.
 361 * The global function wfBaseConvert, deprecated in 1.27, has been removed. Use
 362   Wikimedia\base_convert() directly.
 363 * Calling Database::begin() explicitly during an implicit transaction or when
 364   DBO_TRX is set results in an exception. Calling Database::commit() explicitly
 365   for an implicit transaction also results in an exception. Previously these
 366   were logged as errors. The startAtomic() and endAtomic() methods, or
 367   AtomicSectionUpdate should be used instead.
 368 * The global function wfOutputHandler() was removed, use the its replacement
 369   MediaWiki\OutputHandler::handle() instead. The global function was only
 370   sometimes defined. Its replacement is always available via the autoloader.
 371 * ChangeTags::listExtensionActivatedTags and ::listExtensionDefinedTags,
 372   deprecated in 1.28, have been removed. Use ::listSoftwareActivatedTags() and
 373   ::listSoftwareDefinedTags() instead.
 374 * Title::getTitleInvalidRegex(), deprecated in 1.25, has been removed. You can
 375   use MediaWikiTitleCodec::getTitleInvalidRegex() instead.
 376 * HTMLForm & VFormHTMLForm::isVForm(), deprecated in 1.25, have been removed.
 377 * The ProfileSection class, deprecated in 1.25 and unused, has been removed.
 378 * The ResourceLoaderGetLessVars hook, deprecated in 1.30, has been removed. Use
 379   ResourceLoaderModule::getLessVars() to expose local variables instead of
 380   global ones.
 381 * As part of work to modernise user-generated content clean-up, a config option
 382   and some methods related to HTML validity were removed without deprecation.
 383   The public methods MWTidy::checkErrors() and the path through which it was
 384   called, TidyDriverBase::validate(), are removed, as are the testing methods
 385   MediaWikiTestCase::assertValidHtmlSnippet() and ::assertValidHtmlDocument().
 386   The $wgValidateAllHtml configuration option is removed and will be ignored.
 387 * Execution of external programs using MediaWiki\Shell\Command now applies
 388   the RESTRICT_DEFAULT Firejail restriction by default.
 389 * The ResourceLoaderModule::getHashMtime() and ::getDefinitionMtime() methods,
 390   deprecated in 1.26, were removed.
 391 * The deprecated 'mediawiki.widgets.CategorySelector' module alias was removed.
 392   Use the 'mediawiki.widgets.CategoryMultiselectWidget' module directly.
 393
 394 === Deprecations in 1.31 ===
 395 * The Revision class was deprecated in favor of RevisionStore, BlobStore, and
 396   RevisionRecord and its subclasses.
 397 * The global function wfBCP47 is deprecated in favour of LanguageCode::bcp47.
 398 * The global function wfCountDown is now deprecated in favor of
 399   Maintenance::countDown.
 400 * Several methods for returning lists of fields to select from the database
 401   have been deprecated in favor of similar methods that also return the tables
 402   to select from and the join conditions for those tables.
 403   * Block::selectFields() → Block::getQueryInfo()
 404   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 405   * ArchivedFile::selectFields() → ArchivedFile::getQueryInfo()
 406   * LocalFile::selectFields() → LocalFile::getQueryInfo()
 407   * LocalFile::getCacheFields() with a prefix no longer works
 408   * LocalFile::getLazyCacheFields() with a prefix no longer works
 409   * OldLocalFile::selectFields() → OldLocalFile::getQueryInfo()
 410   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 411   * Revision::userJoinCond() → Revision::getQueryInfo( [ 'user' ] )
 412   * Revision::selectUserFields() → Revision::getQueryInfo( [ 'user' ] )
 413   * Revision::pageJoinCond() → Revision::getQueryInfo( [ 'page' ] )
 414   * Revision::selectPageFields() → Revision::getQueryInfo( [ 'page' ] )
 415   * Revision::selectTextFields() → Revision::getQueryInfo( [ 'text' ] )
 416   * Revision::selectFields() → Revision::getQueryInfo()
 417   * Revision::selectArchiveFields() → Revision::getArchiveQueryInfo()
 418   * User::selectFields() → User::getQueryInfo()
 419   * WikiPage::selectFields() → WikiPage::getQueryInfo()
 420 * Revision::setUserIdAndName() was deprecated.
 421 * Access to TitleValue class properties was deprecated, the relevant getters
 422   should be used instead.
 423 * DifferenceEngine::getDiffBodyCacheKey() is deprecated. Subclasses should
 424   override DifferenceEngine::getDiffBodyCacheKeyParams() instead.
 425 * Use of Maintenance::error( $err, $die ) to exit script was deprecated. Use
 426   Maintenance::fatalError() instead.
 427 * Passing a ParserOptions object to OutputPage::parserOptions() is deprecated.
 428 * The RevisionInsertComplete hook is now deprecated; use instead the hook
 429   RevisionRecordInserted. RevisionInsertComplete is still called, but the second
 430   and third parameter will always be null. Hard deprecation is scheduled for 1.32.
 431 * The following methods that get and set ParserOutput state are deprecated.
 432   Callers should use the new stateless $options parameter to
 433   ParserOutput::getText() instead.
 434   * ParserOptions::getEditSection()
 435   * ParserOptions::setEditSection()
 436   * ParserOutput::getEditSectionTokens()
 437   * ParserOutput::setEditSectionTokens()
 438   * ParserOutput::getTOCEnabled()
 439   * ParserOutput::setTOCEnabled()
 440   * OutputPage::enableSectionEditLinks()
 441   * OutputPage::sectionEditLinksEnabled()
 442   * The public ParserOutput state fields $mTOCEnabled and $mEditSectionTokens
 443     are also deprecated.
 444 * License::getLicenses has been deprecated; use License::getLines instead.
 445 * QuickTemplate::setRef() was deprecated in favour of QuickTemplate::set().
 446   Setting template variables by reference allowed violating the principle of
 447   data being immutable once added to the skin template. In practice, this method
 448   was not being used for that. Rather, setRef() existed as memory optimisation
 449   for PHP 4.
 450 * QuickTemplate::setTranslator() and MediaWikiI18N::set() were deprecated in
 451   favour of Skin::msg() parameters.
 452 * MediaWikiI18N::translate() was deprecated in favour of Skin::msg() or
 453   wfMessage().
 454 * Passing false to ParserOptions::setWrapOutputClass() is deprecated. Use the
 455   'unwrap' transform to ParserOutput::getText() instead.
 456 * \ObjectFactory (no namespace) is deprecated, the namespaced class
 457   \Wikimedia\ObjectFactory from the wikimedia/object-factory library should be
 458   used instead.
 459 * CommentStore::newKey is deprecated. Instead, get an instance from
 460   MediaWikiServices.
 461 * The following CommentStore methods have had their signatures changed to
 462   introduce a $key parameter, usage of the methods on instances retrieved from
 463   CommentStore::newKey will remain unchanged but deprecated:
 464   * CommentStore::getFields
 465   * CommentStore::getJoin
 466   * CommentStore::getComment
 467   * CommentStore::getCommentLegacy
 468   * CommentStore::insert
 469   * CommentStore::insertWithTemplate
 470 * The following methods in Title have been renamed, and the old ones are
 471   deprecated:
 472   * Title::getSkinFromCssJsSubpage – use ::getSkinFromConfigSubpage
 473   * Title::isCssOrJsPage – use ::isSiteConfigPage
 474   * Title::isCssJsSubpage – use ::isUserConfigPage
 475   * Title::isCssSubpage – use ::isUserCssConfigPage
 476   * Title::isJsSubpage – use ::isUserJsConfigPage
 477 * The following methods related to caching of half-parsed HTML were deprecated:
 478   * Parser::serializeHalfParsedText()
 479   * Parser::unserializeHalfParsedText()
 480   * Parser::isValidHalfParsedText()
 481   * StripState::getSubState()
 482   * StripState::merge()
 483 * The DeferredStringifier class is deprecated, use Message::listParam() instead.
 484 * The type string for the parameter $lang of DateFormatter::getInstance is
 485   deprecated.
 486 * Wikimedia\Rdbms\SavepointPostgres is deprecated.
 487 * The DO_MAINTENANCE constant is deprecated. RUN_MAINTENANCE_IF_MAIN should be
 488   used instead.
 489 * The function wfShellWikiCmd() has been deprecated, use
 490   MediaWiki\Shell::makeScriptCommand().
 491 * In the future, the hooks 'PreferencesFormPreSave' and 'PreferencesGetLegend'
 492   will be allowed to provide any HTMLForm object rather than PreferencesForm.
 493
 494 === Other changes in 1.31 ===
 495 * Browser support for Internet Explorer 10 was lowered from Grade A to Grade C.
 496 * Browser support for Opera 12 and older was dropped entirely. Opera 15+
 497   continues at Grade A.
 498 * Multi-content-revision capability was introduced into the storage layer. See
 499   <https://mediawiki.org/wiki/Requests_for_comment/Multi-Content_Revisions>.
 500 * The "free" CSS class is now only applied to unbracketed URLs in wikitext.
 501   Links written using square brackets will get the class "text" not "free".
 502 * RFC 157418: Whitespace is trimmed from wikitext headings, wikitext list items,
 503   wikitext table captions, wikitext table headings, wikitext table cells. HTML
 504   headings, HTML list items, HTML table captions, HTML table headings, HTML
 505   table cells will not have this trimming behavior.
 506
 507 == Compatibility ==
 508 MediaWiki 1.31 requires PHP 7.0.0 or later. Although HHVM 3.18.5 or later is
 509 supported, it is generally advised to use PHP 7.0.0 or later for long term
 510 support. MediaWiki requires that the mbstring, xml, ctype, json, iconv and
 511 fileinfo PHP extensions are loaded to work.
 512
 513 MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
 514 but support for them is somewhat less mature. There is experimental support for
 515 Oracle and Microsoft SQL Server.
 516
 517 The supported versions are:
 518
 519 * MySQL 5.5.8 or later
 520 * PostgreSQL 9.2 or later
 521 * SQLite 3.3.7 or later
 522 * Oracle 9.0.1 or later
 523 * Microsoft SQL Server 2005 (9.00.1399)
 524
 525 == Upgrading ==
 526 1.31 has several database changes since 1.30, and will not work without schema
 527 updates. Note that due to changes to some very large tables like the revision
 528 table, the schema update may take quite long (minutes on a medium sized site,
 529 many hours on a large site).
 530
 531 Don't forget to always back up your database before upgrading!
 532
 533 See the file UPGRADE for more detailed upgrade instructions, including
 534 important information when upgrading from versions prior to 1.11.
 535
 536 For notes on 1.30.x and older releases, see HISTORY.
 537
 538 == Online documentation ==
 539 Documentation for both end-users and site administrators is available on
 540 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 541 for pages that explicitly state that their contents are in the public domain):
 542
 543        https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation
 544
 545 == Mailing list ==
 546 A mailing list is available for MediaWiki user support and discussion:
 547
 548        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 549
 550 A low-traffic announcements-only list is also available:
 551
 552        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 553
 554 It's highly recommended that you sign up for one of these lists if you're
 555 going to run a public MediaWiki, so you can be notified of security fixes.
 556
 557 == IRC help ==
 558 There's usually someone online in #mediawiki on irc.freenode.net.