RELEASE-NOTES-1.38

= MediaWiki 1.38 =

== MediaWiki 1.38.5 ==

THIS IS NOT A RELEASE YET

=== Changes since MediaWiki 1.38.4 ===

== MediaWiki 1.38.4 ==

This is a maintenance release of the MediaWiki 1.38 branch.

=== Changes since MediaWiki 1.38.3 ===
* Fix missing use statement from backport of fix for T307278.

== MediaWiki 1.38.3 ==

This is a security and maintenance release of the MediaWiki 1.38 branch.

=== Changes since MediaWiki 1.38.2 ===
* Localisation updates.
* (T311568) UploadBase::setTempFile() handle $tempPath being passed as null.
* (T311559) SpecialListFiles: user parameter isn't always present.
* (T311561) ImageListPager: Don't call htmlspecialchars() on null.
* (T311920) SpecialBlockList: Prevent passing null to trim().
* (T311921) SpecialUserrights: Don't pass null to str_replace.
* (T311570) SpecialWithoutInterwiki: Don't pass null through to
  Title::capitalize().
* (T311574, T311576) SpecialLinkSearch: Don't pass null through to the parser.
* (T311360) RecentChange: Straight join to actor table when needed.
* (T311360) RecentChange: Make join to comment table also straight.
* Remove messages in en-gb.json.
* (T312519, T312520) Parser::extensionSubstitution() Don't run substr() on null.
 (T287564) populateInterwiki: Include not null columns iw_api/iw_wikiid.
* (T312302) SpecialRedirect: Don't pass null to explode.
* RemoveInvalidEmails: Fix quoting for postgres.
* (T312678) import: UploadSourceAdapter::stream_read() don't pass null to
  strlen().
* (T312300) SpecialDiff: Don't pass null to explode().
* (T312680) parser: Fix CoreParserFunctions::urlencode() null coalescence $arg.
 (T289926) Handle null passed to wfShorthandToInteger() and Html::element().
* (T289926) Ensure that strlen() does not get passed a (valid) null.
* (T312301) SpecialDiff: Don't pass null to trim().
* Hooks: Use more meaningful name for SkinAfterPortlet hook parameter.
* (T289926) Ensure we don't pass null to mb_strlen.
* (T312305, T311572, T311571, T311578) HtmlForm: Null coalescence in trim()
  calls.
* (T289926) site: Consistently return null from Site::getDomain().
* (T307304, T289879) filebackend,jobqueue: Add signature for
  FilterIterator::accept().
* (T304559) Use page ID from parent revision, improve logging.
* (T312183) rdbms: Adapt hasOrMadeRecentPrimaryChanges test mock for PHP 8.1.
* Add application/vnd.ms-opentype to MIME list.
* Allow composer/installers plugin in composer.json.
* (T313663) Make ReadOnlyModeTest work in php8.
* (T313663) Make HandlerTestTrait compatible with php8.1.
* (T313663) [php8] Make DeletePageTest stop giving warnings on php8.1.
* Change type hints for BatchRowIterator and NotRecursiveIterator for
  compatibility with PHP 8.1.
* (T313663) [php8.1] Change override of $wgResourceBasePath for CSP tests.
* (T313663) parser: Mock WikiPage::getContentModel in ParserCacheTest to fix
  php8.1.
* (T313663) [php8.1] Make WikiImporterFactoryTest use better mock for
  ImportSource.
* Fix tests so getName() doesn't return null.
* (T313663) [php8] Don't use strlen on potentially null string.
* (T313663) [php8.1] Suppress test warning about providing null.
* (T313663) [php8.1] mock User::getTitleKey() in DeaultPreferencesFactoryTest.
* (T313663) Parser will use current timestamp instead of null if passed a
  RevisionRecord that does not have a timestamp.
* (T313663) Add explicit null check for $sha in FileBackend [php8.1].
* (T313663) LogFormatter: Cast argument of ctype_digit to string [php8.1].
* (T313663) Mock UserOptionsManager::getOption for php8.1.
* (T289879, T289926) Get rid of warnings on PHP 8.1.
* (T313663) Check for null return of preg_replace in MediaWikiTitleCodec.
* (T313663) cast db name to string when checking if it is read only [php8.1].
* (T313663) Avoid testing strlen on null in ApiQuerySiteinfo [php 8.1 compat].
* (T313663) Use default timezone UTC for SpecialWatchlistTest [php 8.1].
* (T313663) Mock User::getTitleKey in SpecialPreferencesTest [php 8.1].
* (T314096) Migrate use of ${var}-style string interpolation.
* (T314099) preprocessor: Add missing field declarations.
* (T313663, T313662) Make default value for optional args {{PAGESINCAT:..}} be
  '' not null.
* (T313663) [php8.1] Mock out getLocalDomainID for WatchedItemStore tests.
* (T313663) Suppress warnings for the null test of addIdentifierQuotes.
* (T314225) SpecialCategories: Null coalescene $par.
* (T314099) User: Allow dynamic properties on PHP 8.2.
* (T314404) SpecialGoToInterwiki: Null coalescene $par.
* (T314397) SpecialBlock: Better handle null in getTargetUserTitle.
* (T314099) phpunit: Fix trivial dynamic property usages in tests.
* (T314405) UploadStash: Check if us_prop is set in the fileMetadata.
* (T313663) Make ChangesListSpecialPageTest cast to string for php 8.1.
* (T313663) Do not test giving a null fragment to Title::makeTitle.
* (T314550) SpecialMergeHistory: Set timestamp to '' if no mergepoint.
* (T314551) SpecialMergeHistory: Set defaults for target and dest parameters.
* (T313663) Cast results of Sqlite test to string [php 8.1].
* (T314208) Set $wgServer for HttpRequestFactoryTest to prevent warnings on
  php8.1.
* (T314208, T297082) phpunit: Fallback to global default user options.
* (T307282) Avoid passing null to strcasecmp(), for PHP 8.1.
* Fix a couple deprecation warnings in the installer under PHP 8.1.
* api: Add rel=nofollow to help examples.
* (T307613) Validate length of user email on Special:ChangeEmail/
  Special:CreateAccount.
* (T314226) LoginSignupSpecialPage: Check if $value is a string before length.
* (T314824) tests: Update parser test after i18n change.
* (T313663, T296083) context: Replace deprecated User::getOption.
* (T295958, T278847) MediaWiki-Docker: Switch PHP images to PHP7.4.
* (T314906, T314907) SpecialBlock: Set defaults for wpPageRestrictions and
  wpNamespaceRestrictions.
* (T315309) ImportStreamSource::newFromURL() Prevent passing null to fwrite.
* (T315892) composer.json: Pin phpunit to 8.5.28.
* (T313663) Do not compare byte-for-byte of serialized items in tests [php8.1].
* objectcache: avoid php 8.1 argument type warnings in
  genericKeyFromComponents().
* (T317750) session: Fix broken SessionTest case due to PHPUnit dependency
  change.
* ManualLogEntry: Don't pass null to trim() as PHP 8.1 whines.
* (T313663) Add a null check VueComponentParser to prevent php8.1 issues.
* (T313049) Bump wikimedia/parsoid to v0.15.1.
* (T318754) WebInstallerOptions::addPersonalizationOptions(): Close fieldset.
* (T318460) SpecialChangeEmail: Set default for returntoquery.
* (T318307) Update docs for HTMLFormField::validate() to permit all data types.
* (T316304, CVE-2022-41767) SECURITY: reassignEdits doesn't update results
  in an IP range check on Special:Contributions.
* (T309894, CVE-2022-41765) SECURITY: HTMLUserTextField exposes existence
  of hidden users.
* (T307278, CVE-2022-41766) SECURITY: On action=rollback the message
  "alreadyrolled" can leak revision deleted user name.

== MediaWiki 1.38.2 ==

This is a security and maintenance release of the MediaWiki 1.38 branch.

=== Changes since MediaWiki 1.38.1 ===
* Localisation updates.
* (T309426) Repair language selector for SVGs.
* (T310013) Fix default value for $wgShowEXIF and $wgUsePathInfo.
* (T308471) SECURITY: Escape welcomeuser message passed to showSuccessPage().
* (T308473) SECURITY: Escape contributions-title msg for use within page title.
* (T311272) Call parent constructor of AddSite maintenance script first.
* MediaWiki: Don't eagerly initialize action name.
* (T311384, CVE-2022-27776) Updated guzzlehttp/guzzle from 7.4.1 to 7.4.5.
* (T289926) Avoid passing null to trim() in SkinTemplate.
* (T289879) Address deprecations for PHP 8.1.
* (T311473) rollbackEdits: Pass user identity to RollbackPage.
* Upgrade wikimedia/remex-html from 3.0.1 to 3.0.2.
* (T311551) ShellboxClientFactory::getUrl(): Check if $this->key is null.
* (T311552) ChangesListSpecialPage: Don't pass null to FormatJson::decode().
* (T311569) FileBackend::isStoragePath() Handle being passed null.
* (T311544) Pass int to ApiUsageException::newWithMessage()'s $httpCode param.
* (T311678) SpecialEditWatchlist: Prevent passing null to strtolower().
* (T311554) ChangeTags: Return early in formatSummaryRow() if $tags === null.
* Upgrade wikimedia/common-passwords from 0.3.0 to 0.4.0.

== MediaWiki 1.38.1 ==

This is a maintenance release of the MediaWiki 1.38 branch.

=== Changes since MediaWiki 1.38.0 ===
* (T309860) Add justinrainbow/json-schema to vendor.
* (T309933) Drop PHP 7.2 support in MediaWiki 1.38; require 7.3.19.

== MediaWiki 1.38.0 ==

=== Changes since MediaWiki 1.38.0-rc.1 ===
* Localisation updates.
* (T309114) LocalFile::prerenderThumbnails: Limit the number of thumbnail
  jobs triggered.
* (T305779) phpunit: Support setting skin context in BundleSizeTest subclasses.
* (T309028) SECURITY: ApiEditPage: update title after redirects.
* (T308967) notifications: prevent log spam when invalid user object listed.
* composer: Lock Parsoid version to specific 0.15.0 release.
* (T306362, T308680) change-your-logo.svg: Resize to 135px square, re-crush,
  and manually minify.

== MediaWiki 1.38.0-rc.1 ==

=== Changes since MediaWiki 1.38.0-rc.0 ===
* Localisation updates.
* (T305028) Undeprecate EditPage::$textbox2.
* (T305635) LogActions is a map, not a list.
* (T306721) Add wikimedia/equivset to vendor; needed by bundled AbuseFilter.
* (T307284) Simplify TransactionManager::pendingWriteQueryDuration.
* (T307307) Add symfony/yaml to vendor.
* Fix old_name in UserLogoutComplete hook.
* REST: don't send stack trace in error responses.
* (T307998) SessionManager: stop storing an ObjectFactory instance.
* (T193565) UserGroupManager: Fix dbDomain in addUserToGroup() deferred update.

== Upgrading notes for 1.38 ==
Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed per-version upgrade instructions from the
oldest supported upgrading version, MediaWiki 1.29.

Some specific notes for MediaWiki 1.38 upgrades are below:
* (T191740) The AbuseFilter extension is now bundled with MediaWiki. This is an
  anti-abuse feature that lets privileged users to set specific actions to be
  taken when actions by users, such as edits or file uploads, match certain
  criteria.
* (T232948) The Math extension is now bundled with MediaWiki. This is a content
  feature that lets users create mathematical formulæ, written in a sub-set of
  LaTeX and rendered in MathML with a fallback SVG image. By default, it will
  use Wikimedia's mathoid service to render each formula, but local rendering
  can be set up for network isolation or performance.
* (T191743) The Minerva skin is now bundled with MediaWiki. This is a simple,
  light-weight, and scalable skin that is particularly optimised for mobile use,
  and integrates well with the MobileFrontend extension (available separately),
  but can also be used as a regular desktop skin.

For notes on 1.37.x and older releases, see HISTORY.

=== Configuration changes for system administrators in 1.38 ===

==== New configuration ====
* (T297708) $wgMaxExecutionTimeForExpensiveQueries - This setting can be used to
  control the maximum execution time for several expensive query pages (e.g.
  RecentChanges and UserContribs).
* $wgBrowserFormatDetection – This setting allows overriding browsers' automatic
  detection and handling of formats. It's initially used to prevent auto-linking
  of possible telephone numbers in wiki pages' output in Safari on iOS; this can
  be re-enabled if you wish, or locally extended for other browsers' quirks.
* (T240685) $wgMetricsTarget, $wgMetricsFormat, $wgMetricsPrefix - These provide
  configuration for a new MetricsFactory service with support for the dogstatsd
  format, intended for integration with Prometheus integration.
* $wgGroupInheritsPermissions – This setting allows inheriting permissions, both
  granted and revoked, from another group.
* $wgForeignApiRepos – ForeignAPIRepo now has a apiMetadataExpiry option to
  control for how long file metadata is cached. Additionally the default changed
  from 1 hour to 4 hours.
* $wgSkinsPreferred – This lets you set a list of preferred skins to be listed
  higher in Special:Preferences.
* $wgWikiFarmSettingsDirectory – A directory that contains site-specific
  configuration files. Setting this will enable multi-tenant ("wiki farm")
  mode, causing site-specific settings to be loaded based on information from
  the web request. EXPERIMENTAL.
* $wgWikiFarmSettingsExtension – The file extension to be used when looking up
  site-specific settings files in $wgWikiFarmSettingsDirectory, such as 'json'
  or 'yaml'. EXPERIMENTAL.
* $wgWikiFarmSiteDetector – A callback function that returns the name of the
  wiki for the current request. This is used in multi-tenant ("wiki farm")
  mode to determine which settings file to load from
  $wgWikiFarmSettingsDirectory. EXPERIMENTAL.
* $wgEnableRemoteBagOStuffTests – This replaces the environment variable
  PHPUNIT_USE_BAGOSTUFF.
* (T230211) $wgForceDeferredUpdatesPreSend – Force deferred updates to be run
  before sending a response to the client, instead of attempting to run them
  after sending the response. Setting this to true is useful for end-to-end
  testing, to ensure that the effects of a request are visible to any subsequent
  requests, even if they are made immediately after the first one. Note however
  that this does not ensure that database replication is complete, nor does it
  execute any jobs enqueued for later.
* $wgTemplateLinksSchemaMigrationStage – Templatelinks table schema migration
  stage, for normalizing tl_namespace and tl_title fields.

==== Changed configuration ====
* $wgStyleDirectory and $wgExtensionDirectory – These are now set later, so can
  no longer be used within LocalSettings.php unless explicitly set in that file.
* $wgFileBackends – This setting no longer takes 'fileJournal' as an option.
* $wgMaxImageArea - This setting may now be set to false to disable size.
  checking before scaling. Extensions can still override its value by using the
  BitmapHandlerCheckImageArea hook.
* $wgAjaxUploadDestCheck – This is now deprecated, and act as always-true.
* $wgInterwikiCache – This no longer supports the string value for CDB files.
* $wgParserOutputHooks – This is now deprecated; adjustments using this should
  be done with OutputPageParserOutputHook instead. (T292321)
* $wgExternalStores – This is newly documentated in
  includes/externalstore/README.md.

==== Removed configuration ====
* $wgShellLocale - This setting has been removed as it was a flawed solution to
  the problem of locale dependence, MediaWiki will now always set a locale of
  C.UTF-8 or C and works around the remaining problems of the C locale by not
  using escapeshellarg. This follows the direction of PHP 8.0, which sets a
  locale of C by default instead of respecting LC_CTYPE.
* $wgLoggedOutMaxAge - Experiment removed, originally added in 1.35. (T293848)
* $wgIncludejQueryMigrate - Deprecated in 1.36. We only support jQuery v3.
* $wgUseCategoryBrowser - This experimental feature has been removed. If you
  still need to use this feature, please see [[mw:Extension:CategoryExplorer]].
* $wgStyleSheetPath - alias for $wgStylePath, deprecated since 1.3 (2004).

=== User-facing changes in 1.38 ===
* (T284921) The "auto-number headings" feature was removed following a
  consultation, due to performance reasons.

=== New operator/developer features in 1.38 ===
* EXPERIMENTAL: The environment variable MW_CONFIG_FILE can be used to specify
  the location of the settings file. This allows alternative settings files to
  be loaded depending on the environment. Settings files may be given as PHP
  files like the traditional LocalSettings.php file, or they may use JSON or
  YAML format.
  See https://www.mediawiki.org/wiki/Manual:YAML_settings_file_format
* Added a deleteUserEmail maintenance script - This file enables the deletion of
  a given user's associated email address. It can be helpful for
  privacy-preserving operations.
* The description array for constructing an HTMLForm now can use 'disable-if' to
  disable fields on condition easily, supported expressions are the same as
  'hide-if'.
* There is a new interface, IForeignRepoWithMWApi, to allows you to mark file
  repos provided by an extension as supporting making API queries against the
  foreign file repo so that extensions like TimedMediaHandler that depend on
  this can stop hard-coding looking for specific class names.
* Added EXPERIMENTAL support for an easy to configure multi-tenant ("wiki
  farm") mode:
  Settings for each site can be placed in a directory specified by
  $wgWikiFarmSettingsDirectory. Site detection is controlled by
  $wgWikiFarmSiteDetector and defaults to the requested host name.
  For example, setting $wgWikiFarmSettingsDirectory = "sites" would cause
  the settings for wiki.example.com to be loaded from
  "sites/wiki_example_com.yaml".
  WARNING: YAML files under the web root may be accessible to browsers, please
  take appropriate measures to protect them from access via HTTP.
* Running QUnit tests for an individual test suite module is possible with
  `grunt qunit --qunit-component={componentName}`, where {componentName} is
  "MediaWiki" to run core's QUnit tests or the skin or extension name.
* The 'mediawiki.mixins' module now has a `.user-select()` Less mixin.

=== External library changes in 1.38 ===

==== New external libraries ====
* symfony/yaml was promoted from development-only.
* justinrainbow/json-schema was promoted from development-only.

==== Changed external libraries ====
* Updated OOUI from v0.42.0 to v0.43.2.
* Updated Vue from 2.6.11 to 3.2.23.
* Updated WVUI from v0.3.0 to v0.4.0.
* Updated composer/semver from 3.2.5 to 3.2.6.
* Updated guzzlehttp/guzzle from 7.2.0 to 7.4.5.
* Updated pear/mail_mime from 1.10.9 to 1.10.11.
* Updated pear/net_smtp from 1.9.2 to 1.10.0.
* Updated psr/log from 1.1.3 to 1.1.4.
* Updated psy/psysh from 0.10.5 to 0.11.1.
* Updated symfony/polyfill-php80 from 1.23.1 to 1.25.0.
* Updated wikimedia/assert from 0.5.0 to 0.5.1.
* Updated wikimedia/cdb from 1.4.1 to 2.0.0.
* Updated wikimedia/ip-utils from 3.0.2 to 4.0.0.
* Updated wikimedia/minify from 2.2.4 to 2.2.6.
* Updated wikimedia/object-factory from 3.0.2 to 4.0.0.
* Updated wikimedia/parsoid from v0.14.0-a14 to v0.15.1.
* Updated wikimedia/purtle from 1.0.7 to 1.0.8.
* Updated wikimedia/request-timeout from 1.1.0 to 1.2.0.
* Updated wikimedia/shellbox from 2.0.0 to 3.0.0.
* Updated wikimedia/wrappedstring from 3.2.0 to 4.0.1.
* Updated wikimedia/remex-html from 3.0.1 to 3.0.2.
* Updated wikimedia/common-passwords from 0.3.0 to 0.4.0.

===== Changed development-only external libraries =====
* Updated QUnit from 2.16.0 to 2.18.0.
* Updated composer/semver from 3.5.4 to 3.5.5.
* Updated composer/spdx-licenses from 1.5.4 to 1.5.5.
* Updated doctrine/dbal for PHP < 7.3 from 2.10.4 to 2.13.6.
* Updated doctrine/dbal for PHP >= 7.3 from 3.0.0 to 3.1.5.

==== Removed external libraries ====
* jquery.jStorage, deprecated since MW 1.28; use "mediawiki.storage" instead.

=== Action API changes in 1.38 ===
* New `deletetalk` parameter on action=delete that allows you to delete the
  associated talk page of a subject page.
* New `variant` parameter for all API actions, for specifying language variant
  (akin to the existing `variant` parameter for index.php). Task T117549.

=== Languages updated in 1.38 ===
MediaWiki supports over 400 languages. Many localisations are updated regularly.
Below only new and removed languages are listed, as well as changes to languages
because of Phabricator reports.

* (T292166) Updated namespace names for the Lombard language.
* (T299201) Changed the autonym of the Angika language to अंगिका
* (T298309) Changed the autonym of the Abkhaz language to аԥсшәа
* (T302972) Changed the autonym of the Kirundi language to ikirundi
* (T220303) Show numbered lists with Burmese numerals in relevant languages
* (T291899) Added language support for Xiang Chinese (hsn).
* (T292612) Added language support for S'gaw Karen (ksw).
* (T293656) Added language support for Farefare (gur).
* (T294729) Added language support for Pa'O (blk).
* (T296286) Added language support for Skolt Sámi (sms).
* (T296612) Added language support for Makhuwa (vmw).
* (T296707) Added language support for Ga (gaa).
* (T297073) Added language support for Nanai (gld).
* (T297074) Added language support for Nawdm (nmz).
* (T298075) Added language support for Northern Thai (nod).
* (T298182) Added language support for Cape Verdean Creole (kea).
* (T298385) Added language support for Nheengatu (yrl).
* (T299329) Added language support for Fon (fon).
* (T300474) Added language support for Nkore (nyn).
* (T302556) Added language support for Pannonian Rusyn (rsk).

=== Breaking changes in 1.38 ===
* (T291008) The IP class, deprecated since 1.35 in favor of the IPUtils library,
  has been removed. The IP related regexes which were also deprecated in favor
  of the IPUtils library were also removed, IPUtils::RE_* should be used
  instead.
* (T293043) The MediaWikiIntegrationTestCase class alias 'MediaWikiTestCase' has
  been removed.
* LinkCache::singleton(), deprecated since 1.28, has been removed.
* RepoGroup::singleton(), ::destroySingletons() and setSingleton(), all
  deprecated since 1.34, have been removed.
* The following methods from FileDeleteForm were removed:
  - ::__construct (the class is no longer newable)
  - ::execute()
  - ::haveDeletableFile()
  Use FileDeleteAction instead.
* MessageCache::singleton(), deprecated since 1.34, has been removed.
* LockManagerGroup::singleton() and ::destroySingletons(), both deprecated since
  1.34, have been removed.
* FileBackendGroup::singleton() and ::destroySingletons(), both deprecated since
  1.35, have been removed.
* TemplateParser used to support disabling the cache with a boolean parameter in
  its constructor. This was deprecated in 1.35 and has now been removed.
* The ArticleUndeleteLogEntry hook, deprecated in 1.37, was removed.
* The BeforeResetNotificationTimestamp hook, deprecated in 1.37, was removed.
* The global function mimeTypeMatch() has been removed without a deprecation
  process.
* The following JavaScript mw.config keys have been removed:
  - $wgCookiePrefix
  - $wgCookieDomain
  - $wgCookiePath
  - $wgCookieExpiration
  Use mw.cookie from the mediawiki.cookie module instead.
* The signature of PageUpdater::markAsRevert method was changed. It has never
  been used outside of MediaWiki core.
* If you want to use interwiki titles with HTMLTitleTextField, you now need to
  pass 'interwiki' => true. In 1.37, the default behavior was to let interwiki
  title through by default, logging a deprecation warning.
* The `UndeleteForm::undelete` hook, deprecated in 1.37, was removed.
* BagOStuff::setDebug(), deprecated since 1.36, has been removed.
* The `jquery.mw-jump` ResourceLoader module was removed.
* The `wgForeignUploadTargets` and `wgEnableUploads` configuration values were
  removed from mw.config. They had previously been documented as being included
  for internal use by the mediawiki.ForeignUpload module.
*The `&$hasHistory` parameter to WikiPage::getAutoDeleteReason() and
  ContentHandler::getAutoDeleteReason() was hard-deprecated with no replacement.
* Several Skin methods, which have emitted deprecation warnings since 1.36, have
  been removed. These include:
  - Skin::privacyLink()
  - Skin::aboutLink()
  - Skin::disclaimerLink()
    For these, instead use Skin::footerLink() to alter footer links.
  - Skin::getLogo()
    For this, use ResourceLoaderSkinModule::getAvailableLogos() instead.
  - Skin::getIndicatorsHTML()
    For this, use Skin::getIndicatorsData() instead.
  - Skin::subPageSubtitle()
    For this, use Skin::prepareSubtitle() instead.
  - Skin::makeVariablesScript()
    For this, use ResourceLoader::makeInlineScript() instead.
  - Skin::getAllowedSkins()
  - Skin::getSkinNames()
    For these, use SkinFactory::getAllowedSkins() or ::getInstalledSkins().
  - Skin::makeUrl()
  - Skin::getSearchLink()
  - Skin::mainPageLink()
* Parser::getUser and ::mUser, as well as ParserOptions::getUser, deprecated
  since 1.37, has been removed.
* Parser::$mStripState, deprecated in 1.35, has been made private. Use
  Parser::getStripState() instead.
* The following deprecated features in blocks were removed:
  - DatabaseBlock constructor 'byText' property with blocker's name, use 'by'
    property with UserIdentity value instead.
  - DatabaseBlock constructor 'by' property with blocker's ID, use 'by' property
    with UserIdentity value instead.
  - DatabaseBlock::isWhitelistedFromAutoblocks, use ::isExemptedFromAutoblocks.
  - DatabaseBlock::setBlocker now only accepts UserIdentity.
  - AbstractBlock::getTargetAndType and ::getTarget, use ::getTargetName,
    ::getTargetUserIdentity and ::getType instead
* The following functions, emitting deprecations since 1.37, have been removed:
  - Title::isWatchable()
  - WatchAction::doWatchOrUnwatch(), WatchAction::doWatch(),
    WatchAction::doUnwatch(), WatchAction::getWatchToken()
  - User::isWatched(), User::isTempWatched(), User::addWatch(),
    User::removeWatch()
* ParserOptions::setTidy() that had no effect and was deprecated since 1.35 has
  been removed.
* The "YAML" encoding option of EtcdConfig, has been removed without
  deprecation.
* The constant ApiBase::PARAM_VALUE_LINKS, deprecated since 1.35 has been
  removed.
* UserLoadOptions, UserSaveOptions and UserResetAllOptions hooks, deprecated
  since 1.37, were removed.
* The experimental FileJournal system has been removed without deprecation. This
  includes the FileJournal abstract class, its implementation classes
  DBFileJournal and NullFileJournal, various minor getters and setters, and the
  option for the wiki configuration $wgFileBackends.
* The return values for each `bind` function in checkboxHack.js has been changed
  from an object to a function. In addition, the `unbind` function has been
  removed. A deprecation process was assumed unnecessary as there were no known
  usages.
* File::getUser, ::getImageSize, ArchivedFile::getRawDescription, ::getUser,
  ::getRawUser and ::getRawDescription, deprecated since 1.37, has been removed.
* ShellboxHttpClient class has been removed without deprecation. It was an
  internal class used by ShellboxClientFactory.
* The following hard deprecated User methods have been removed:
  - ::resetIdByNameCache,
  - ::getStubThreshold,
  - ::matchEditTokenNoSuffix,
  - ::changeableByGroup,
  - ::changeableGroups,
  - ::isAllowUsertalk,
  - ::getRights
  - ::isAllowUsertalk
  - ::isIP,
  - ::isIPRange,
  - ::isValidUserName,
  - ::isUsableName,
  - ::isCreatableName,
  - ::getCanonicalName,
  - ::addAutopromoteOnceGroups,
  - ::getDefaultOptions,
  - ::getDefaultOption,
  - ::getOptions,
  - ::getBoolOption,
  - ::getIntOption,
  - ::setOption
  - ::listOptionKinds
  - ::getOptionKinds,
  - ::resetOptions,
  - ::getEffectiveGroups,
  - ::getAutomaticGroups,
  - ::getFormerGroups
  - ::isLoggedIn
  - ::getFirstEditTimestamp
  - ::getLatestEditTimestamp
* Http::$httpEngine, deprecated since 1.34, has been removed. The only available
  HTTP engine is now Guzzle. CurlHttpRequest and PhpHttpRequest classes were
  removed.
* The UserRightsProxy class was deprecated. Pass the correct domain to
  UserGroupManagerFactory instead.
* Parser option enableLimitReport was deprecated. The report is now generated
  post-parse and can be included by providing 'includeDebugInfo' option to
  ParserOutput::getText. Thus, ParserOptions::enableLimitReport and
  ::getEnableLimitReport methods were deprecated.
* Ajax action that was deprecated in 1.27 now has been removed.
* The following methods have been removed from IDatabase without deprecation as
  they were completely unused:
  - ::preCommitCallbacksPending()
  - ::pendingWriteRowsAffected()
  - ::getServerUptime()
  - ::maxListLen()
* The following deprecated methods have been removed from IDatabase:
  - ::aggregateValue() soft-deprecated since 1.33
  - ::getTopologyRootMaster() since 1.37
  - ::masterPosWait() since 1.37
  - ::dataSeek() soft-deprecated since 1.37
  - ::numFields() soft-deprecated since 1.37
  - ::fieldName() soft-deprecated since 1.37
  - ::onTransactionIdle() soft-deprecated since 1.32
  - ::getMasterPos() since 1.37
* DatabaseMysqlBase::fieldType() and DatabasePostgres::fieldType(), deprecated
  since 1.37, have been removed.
* Database::assertIsWritableMaster(), deprecated since 1.37, has been removed.
* ResultWrapper::getInternalResult(), soft-deprecated since 1.37 and
  ResultWrapper::unwrap(), deprecated since 1.37, have been removed.
* Language::AS_AUTONYMS, deprecated since 1.34, has been removed. You can use
  the LanguageNameUtils::AUTONYMS constant instead.
* Several Language class variables deprecated in 1.35 have been removed; they
  are each replaced by a constant, as listed after the arrow:
  - ::$mWeekdayMsgs → WEEKDAY_MESSAGES
  - ::$mWeekdayAbbrevMsg → WEEKDAY_ABBREVIATED_MESSAGES
  - ::$mMonthGenMsgs → MONTH_GENITIVE_MESSAGES
  - ::$mIranianCalendarMonthMsgs → IRANIAN_CALENDAR_MONTHS_MESSAGES
  - ::$mHebrewCalendarMonthMsgs → HEBREW_CALENDAR_MONTHS_MESSAGES
  - ::$mHebrewCalendarMonthGenMsgs → HEBREW_CALENDAR_MONTH_GENITIVE_MESSAGES
  - ::$mHijriCalendarMonthMsgs → HIJRI_CALENDAR_MONTH_MESSAGES
* wfIncrStats, deprecated since 1.36, has been removed.
* Profiler::profileIn and ::profileOut, deprecated in 1.33, has been removed.
* IEditObject::AS_CANNOT_USE_CUSTOM_MODEL, deprecated in 1.35, was removed.
* Several protected methods in EditPage were made private. None of these was
  used outside of EditPage itself. Since the class is not stable to extend,
  this change happened without a deprecation phase.
* The following public methods in EditPage, unused externally, were
  made private:
   - ::getCancelLink()
   - ::isSupportedContentModel()
   - ::getParentRevId()
* EditPage::setApiEditOverride() was marked as @internal for use by
  ApiEditPage only.
* SelectQueryBuilder::straightJoin() was renamed to straightJoinOption().
* The following deprecated methods have been removed from ILBFactory:
  - ::beginMasterChanges() since 1.37
  - ::commitMasterChanges() since 1.37
  - ::rollbackMasterChanges() since 1.37
  - ::hasMasterChanges() since 1.37
  - ::hasOrMadeRecentMasterChanges() since 1.37
* The "groupLoadsByDB" option to LBFactoryMulti has been removed. Consider using
  "groupLoadsBySection" instead.
* The following methods have been removed from ILoadBalancer without deprecation
  as they were completely unused:
  - ::waitForOne()
  - ::allowLagged()
  - ::forEachOpenReplicaConnection()
* The following deprecated methods have been removed from ILoadBalancer:
  - ::getMasterPos() since 1.37
  - ::finalizeMasterChanges() since 1.37
  - ::approveMasterChanges() since 1.37
  - ::beginMasterChanges() since 1.37
  - ::commitMasterChanges() since 1.37
  - ::runMasterTransactionIdleCallbacks() since 1.37
  - ::runMasterTransactionListenerCallbacks() since 1.37
  - ::rollbackMasterChanges() since 1.37
  - ::flushMasterSnapshots() since 1.37
  - ::hasMasterConnection() since 1.37
  - ::hasMasterChanges() since 1.37
  - ::lastMasterChangeTimestamp() since 1.37
  - ::hasOrMadeRecentMasterChanges() since 1.37
  - ::pendingMasterChangeCallers() since 1.37
  - ::forEachOpenMasterConnection() since 1.37
  - ::waitForMasterPos() since 1.37
* LoadBalancer::safeGetLag() which has been soft-deprecated since 1.34 has been
  removed.
* The following properties of the EditPage class, deprecated since 1.35, were
  made private:
  - ::$deletedSinceEdit
  - ::$lastDelete
  - ::$mTokenOk
  - ::$mTriedSave
  - ::$incompleteForm
  - ::$tooBig
  - ::$missingComment
  - ::$missingSummary
  - ::$allowBlankSummary
  - ::$autoSumm
  - ::$mParserOutput
  - ::$hasPresetSummary
  - ::$minoredit
  - ::$watchthis
  - ::$recreate
  - ::$nosummaryparentRevId
  - ::$editintro
  - ::$scrolltop
  - ::$markAsBot
* Special:ListFiles and Special:NewFiles no longer allows to search for parts of
  file names (option was not available for $wgMiserMode = true)
* DBAccessBase, deprecated since 1.37, has been removed.
* The UserNamePrefixSearch service no longer supports a UserIdentity parameter
  to search(), to check for a specific audience an Authority object is required.
* The methods CoreParserFunctions::register() and CoreTagHooks::register() have
  been marked @internal, and had a seconds parameter added. These methods are
  intended for use in Parser's constructor, and are not used by any known
  extension.
* LoadBalancer::openConnection(), deprecated since 1.34, has been removed.
* Skin::preloadExistence has been made private. There is no known usages outside
  of MediaWiki core.

=== Deprecations in 1.38 ===
* The MWGrants class is deprecated in favor of the new GrantsInfo and
  GrantsLocalization services.
* The global functions wfReadOnly() and wfReadOnlyReason() have been deprecated
  in favor of the ReadOnlyMode service.
* PageProps::getInstance() has been deprecated. Use
  MediaWikiServices::getPageProps() instead.
* User::setOption(), deprecated since 1.35, now emits deprecation warnings.
* Linker::formatComment(), ::formatLinksInComment(), ::commentBlock() and
  revComment() were deprecated. Use the new CommentFormatter service.
* Several Skin methods have been deprecated.
  - Skin::setSearchPageTitle(), Skin::getSearchPageTitle(). For these,
    use SpecialPage::newSearchPage() or associated user preference instead.
  - Skin::getSkinStylePath now triggers deprecation warnings. Direct string path
  should be used instead.
  - SkinTemplate::getPersonalToolsList(), deprecated since 1.35, now emits
  deprecation warnings.
  - In preparation for SkinTemplate::getPortletData becoming a private
    function, extending the method is no longer permitted. Use
    SkinTemplate::getTemplateData instead.
  - SkinTemplate::buildContentNavigationUrls is now deprecated. Skins can
    use the runOnSkinTemplateNavigationHooks method or the
    SkinTemplateNavigation__Universal hook if they need access to this data.
* Usage of several template data keys in QuickTemplate are now deprecated:
  - searchaction, poweredbyico, copyrightico
* DatabaseBlock::purgeExpired(), deprecated since 1.36, now emits deprecation
  warnings.
* The following methods from the User class now trigger deprecation warnings:
   - ::blockedBy
   - ::getBlockId
* Content::getParserOutput and AbstractContent::fillParserOutput was
  hard-deprecated, use ContentRenderer::getParserOutput instead. Extensions
  defining a content model should override ContentHandler::fillParserOutput.
* Title::newFromIDs and TitleFactory::newFromIDs have been hard deprecated. Use
  a PageSelectQueryBuilder from a PageStore instead.
* Content::getRedirectChain() and Content::getUltimateRedirectTarget() have been
  deprecated with no replacement because support for $wgMaxRedirect will be
  removed completely. See T296430 for more information.
* WikiPage::getRedirectTarget() has been deprecated. Use the equivalent
  RedirectLookup::getRedirectTarget() instead.
* Article::doDelete() was deprecated. Use WikiPage::doDeleteArticleReal if you
  only need to delete the article. If you also need things to happen with
  OutputPage, you may want to check the hooks in DeleteAction instead.
* Instantiating the MessageContent class now emits deprecation notices.
* Message::content() now triggers deprecation warnings.
* Parser::setDefaultSort(), Parser::getDefaultSort(), and
  Parser::getCustomDefaultSort() now trigger deprecation warnings. Use
  ParserOutput::{get,set}PageProperty('defaultsort') instead.
* The following methods from the ParserOutput class now emit deprecation
  warnings:
   - ::hideNewSection()      - use ::setHideNewSection()
   - ::preventClickjacking() - use ::{get,set}PreventClickjacking()
   - ::getProperty()         - use ::getPageProperty() (return value changed)
   - ::setProperty()         - use ::setPageProperty()
   - ::unsetProperty()       - use ::unsetPageProperties()
   - ::getProperties()       - use ::getPageProperties()
   - ::getCategoryLinks()    - use ::getCategoryNames()
   - ::setCategoryLinks()    - use ::setCategories()
   - ::addTrackingCategory() - use Parser::addTrackingCategory()
                               or TrackingCategories::addTrackingCategory()
   - ::addWarning()          - use ::addWarningMsg()
   - ::hasDynamicContent()   - use ::hasReducedExpiry()
* The following methods from the ParserOutput class were deprecated:
   - ::getFlag() - use ::getOutputFlag()
   - ::setFlag() - use ::setOutputFlag()
   - ::getAllFlags() - this method is now marked @internal
   - ::addJsConfigVars() - use ::setJsConfigVar() or ::appendJsConfigVar()
   - ::addOutputHook() / ::getOutputHooks() - these hooks should be migrated
     to use the OutputPageParserOutput hook instead
* The use of ParserOutput::setExtensionData() to overwrite previous values
  stored under a given key has been deprecated; use the new
  ::appendExtensionData() to collect multiple values in the ParserOutput rather
  than destructively updating stored values. (T300981)
* The signatures of the following methods from the ParserOutput class were
  narrowed, restricting the permitted argument types:
  - ::addModules() - if you formerly passed a string, pass an array with
     the string as the only element.
   - ::addModuleStyles() - if you formerly passed a string, pass an array
     with the string as the only element.
* Access to the following public or protected properties of OutputPage was
  deprecated; they will be made private or removed in a future release.
  Use accessor functions instead.
  - ::$mCategoryLinks
  - ::$mCategories
  - ::$mIndicators
  - ::$mHeadItems
  - ::$mModules
  - ::$mModuleStyles
  - ::$mJsConfigVars
  - ::$mTemplateIds
  - ::$mEnableClientCache
  - ::$mNewSectionLink
  - ::$mHideNewSectionLink
  - ::$mNoGallery
* The following methods were deprecated; use ::setPreventClickjacking(..)
  instead:
   - OutputPage::preventClickjacking()
   - OutputPage::allowClickjacking()
   - ImageHistoryList::preventClickjacking()
   - ImageHistoryPseudoPager::preventClickjacking()
   - ContribsPager::preventClickjacking()
* OutputPage::enableClientCache() was deprecated, because it is universally used
  to do the opposite -- use OutputPage::disableClientCache() instead.
* Sanitizer::removeHTMLtags() has been deprecated. Its output can include
  unbalanced or ill-formed HTML and thus external callers may be misled about
  how to safely incorporate its output into a page. It is recommended to use the
  new Sanitizer::removeSomeTags() method instead, which will always return
  balanced HTML.
* EventRelayerKafka was deprecated. To use $wgEventRelayerConfig with Kafka,
  add a similar class to your code.
* MediaWiki\Logger\Monolog\KafkaHandler was deprecated. Consider using
  $wgMWLoggerDefaultSpi with SyslogHandler, or to use Kafka, add a similar
  Monolog handler class to your code.
* Collation::singleton() and ::factory() now trigger deprecation warnings.
* The following methods in MWNamespace, all deprecated since 1.34, now emit
  deprecation warnings:
  - isTalk()
  - exists()
  - subjectEquals()
  - getCanonicalNamespaces()
  - getCanonicalName()
  - getCanonicalIndex()
  - getValidNamespaces()
  - isContent()
  - hasSubpages()
  - getContentNamespaces()
* Return values in the parameter $pageLang of the hook PageContentLanguage with
  other types than a Language object, deprecated since 1.33, now emmits
  deprecation warnings.
* Passing a db to BlockRestrictionStore::loadByBlockId() is deprecated.
  BlockRestrictionStoreFactory should be used to fetch a correct
  BlockRestrictionStore instead.
* All external access to ParserOutput and CacheTime classes properties will now
  emit deprecation warnings. Use getters and setters instead.
* The custom jQuery event `watchpage.mw` emitted on #ca-watch and #ca-unwatch is
  now deprecated in favour of the new `wikipage.watchlistChange` hook.
* The global function wfLogProfilingData() has been deprecated without a
  replacement. The logic has been moved to the MediaWiki class.
* The "trace" option of SectionProfiler has been deprecated.
* The PageArchive class has had several methods deprecated. The replacements are
  as follows:
   - Use UndeletePage instead of ::undeleteAsUser(), ::getFileStatus() and
     ::getRevisionStatus().
   - Use the respective methods of the new ArchivedRevisionLookup service
     instead of ::listRevisions, ::getRevisionRecordByTimestamp,
     ::getArchivedRevisionRecord, ::getPreviousRevisionRecord and
     ::getLastRevisionId.
   - Use ArchivedRevisionLookup::hasArchivedRevisions instead of ::isDeleted.
* PageUpdater::isUnchanged() has been deprecated, use wasRevisionCreated()
  instead.
* The `mediawiki.pager.tablePager` module was deprecated in favor of the more
  generic `mediawiki.pager.styles`.
* wfGetCache() and wfGetMainCache(), both deprecated since 1.32, now emit
  deprecation warnings.
* LinkCache::addGoodLinkObj() has been hard deprecated.
* ApiStashEdit::parseAndStash has been hard deprecated.
* Content::prepareSave was hard-deprecated, now emits deprecation warnings.
  Use ContentHandler::validateSave instead.
* The hooks LinksUpdateAfterInsert and LinksUpdateConstructed were deprecated.
* Access to all public properties in LinksUpdate was deprecated.
* The global variable $IP has been deprecated for use in application logic.
  It will remain available for use in LocalSettings.php for now, though
  $wgBaseDirectory is preferred.
  Application logic should use the BaseDirectory setting from the main config.
  Tests and framework code that need to function without MediaWiki being
  fully initialized should use the MW_INSTALL_PATH constant.
* The global function wfWikiID(), deprecated since 1.35, now emits deprecation
  warnings.
* AbstractBlock::getBy() now takes a wikiId as a parameter and emits deprecation
  warnings in case of cross-wiki accesses.
* The `button` parameter for `bindUpdateAriaExpandedOnInput` and
  `updateAriaExpanded` in checkboxHack.js have been deprecated.
  `bindToggleOnSpaceEnter` has also been deprecated in favor of
  `bindToggleOnEnter`.
* IDatabase::lockTables() and IDatabase::unlockTables() have been deprecated
  with no replacement. Instead, callers should batch updates into atomic
  transactions, using FOR UPDATE for SELECT queries.
* EditPage::addNewLineAtEnd() was deprecated; use
  TextboxBuilder::addNewLineAtEnd instead.
* EditPage::getCopywarn() was deprecated; use EditPage::getCopyrightWarning
  instead.
* EditPage::getCopyrightWarning() without passing a MessageLocalizer parameter
  has been deprecated.
* Passing the $formCallback parameter to EditPage::showEditForm, deprecated in
  1.25 and previously emitting a warn notice, now emits a deprecation notice.
* EditPage::$action has been deprecated.
* The following properties in EditPage now emit deprecation notices when used
  from another class:
  - mArticle (use ::getArticle() instead)
  - mTitle (use ::getTitle() instead)
  - isNew (no replacement)
  - allowBlankArticle (no replacement)
  - selfRedirect (no replacement)
  - allowSelfRedirect (no replacement)
  - diff (no replacement)
  - textbox2 (no replacement)
  - undoAfter (no replacement)
  - edit (no replacement)
  - contentLength (no replacement)
* The HTMLForm methods getPreText, setPreText, addPreText, getPostText,
  setPostText, addPostText, getHeaderText, setHeaderText, addHeaderText,
  getFooterText, setFooterText and addFooterText have been renamed to
  getPreHtml, setPreHtml, addPreHtml, getPostHtml, setPostHtml, addPostHtml,
  getHeaderHtml, setHeaderHtml, addHeaderHtml, getFooterHtml, setFooterHtml and
  addFooterHtml respectively.
* The FormSpecialPage methods preText and postText have been renamed to preHtml
  and postHtml respectively.
* Article::doDelete, deprecated in 1.37, now emits deprecation notices.
* The following Less mediawiki.mixins have been deprecated:
  - .background-image()
  - .list-style-image()
* Category::getPageCount now takes a parameter. Category::COUNT_ALL_MEMBERS
  return count of all members while Category::COUNT_CONTENT_PAGES return that
  of content pages. For the former behavior use Category::getMemberCount()
* Using `new HTMLForm( … )` or `HTMLForm::factory( … )` without the $context
  parameter is now deprecated.
* BagOStuff::incr() and BagOStuff::decr() are now deprecated.
* Action::exists() and ActionFactory::actionExists() are deprecated, use
  (bool)ActionFactory::getAction().

=== Other changes in 1.38 ===
* The following things were changed in the file deletion form:
   - The name and ID of the submit button are now `wpConfirmB`, not
      `mw-filedelete-submit`
   - The ID of the form is now `deleteconfirm`, not `mw-img-deleteconfirm`
   - The `mw-filedelete-editreasons` class was replaced with
     `mw-delete-editreasons`
  The goal of these changes is to make the HTML more similar to that of
  normal page deletion.
* ParserOptions created with ::newFrom* or ::newCanonical are now identical.
* MediaWiki initialization order have been changed to load vendor autoload
  earlier. This means that extensions that are installed via composer and
  execute code upon autoloading can not depend on any MediaWiki classes,
  constants or globals in that code.
* The source of truth for configuration defaults is now the MainConfigSchema
  class. DefaultSettings.php still exists for backwards compatibility. A PHP
  file generated for optimized loading will be used in Setup.php to initialize
  configuration variables. Setup.php can be made to load DefaultSettings.php
  as before by setting MW_USE_LEGACY_DEFAULT_SETTINGS as  an environment
  variable (e.g. via SetEnv in htaccess) or a PHP constant (e.g. via
  auto_prepend_file in php.ini).

== Compatibility ==
MediaWiki 1.38 requires PHP 7.3.19 or later and the following PHP extensions:

* ctype
* dom
* fileinfo
* iconv
* intl
* json
* mbstring
* xml

MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
but support for them is somewhat less mature.

The supported versions are:

* MySQL 5.5.8 or later
* PostgreSQL 9.4 or later
* SQLite 3.8.0 or later

== Online documentation ==
Documentation for both end-users and site administrators is available on
MediaWiki.org, and is covered under the GNU Free Documentation License (except
for pages that explicitly state that their contents are in the public domain):

       https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation

== Mailing list ==
A mailing list is available for MediaWiki user support and discussion:

       https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

A low-traffic announcements-only list is also available:

       https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

It's highly recommended that you sign up for one of these lists if you're
going to run a public MediaWiki, so you can be notified of security fixes.

== IRC help ==
There's usually someone online in #mediawiki on irc.libera.chat.