Issue #3324560 by alexpott, mstrelan, dimitriskr, xjm, longwave, catch: Replace strpos/substr with str_starts_with() / str_contains() / str_ends_with()

Revert "Issue #3424509 by godotislate, quietone, sorlov, smustgrave, benjifisher, alexpott: Update MigratePluginManager to include both attribute and annotation class"

This reverts commit c9d53fd4.

Issue #3424509 by godotislate, quietone, sorlov, smustgrave, benjifisher, alexpott: Update MigratePluginManager to include both attribute and annotation class

Issue #3431452 by godotislate, smustgrave, alexpott: Rename RenderElement and FormElement plugin abstract classes to RenderElementBase and FormElementBase

Issue #3436597 by longwave, Spokje: Remove unused DependencySerializationTrait alias from ContextDefinition

Issue #3352256 by e0ipso, plopesc, bbrala, longwave, dww, catch, larowlan: Move code from the experimental SDC module to core

Issue #3436255 by mondrake, longwave: Fix return typehinting for Compiler and EventSubscriber related classes

Issue #2926070 by smustgrave, dimitriskr, andypost, gnuget, zahord, yogeshmpawar, MerryHamster, kim.pepper, alexpott, Mile23, daffie, larowlan: Deprecate ModuleHandlerInterface::getName()

Issue #3420990 by godotislate, smustgrave, alexpott, kim.pepper, longwave: Convert Constraint plugin discovery to attributes

Issue #3332593 by phenaproxima, Wim Leers, borisson_, lauriii, tim.plunkett: Adopt PluginExists validator in relevant places

Issue #3399559 by tstoeckler, smustgrave: Statically cached derivative definitions cannot be cleared in any way

Issue #3404023 by Wim Leers, phenaproxima, mglaman, borisson_, alexpott: DefaultSingleLazyPluginCollection::setConfiguration() accepts NULL but ConfigurableInterface::setConfiguration() does not

Issue #3400458 by alexpott, Berdir, longwave, ReINFaTe, mglaman, larowlan, Charlie ChX Negyesi, kristiaanvandeneynde, cmlara: AttributeClassDiscovery fails while trying to include non valid plugin class

Issue #3252386 by alexpott, longwave, duadua, mondrake, mstrelan, andypost, Spokje, VladimirAus, catch, effulgentsia, Berdir, xjm, bircher, joachim, larowlan: Use PHP attributes instead of doctrine annotations

Issue #3362457 by Wim Leers, NickDickinsonWilde: Fix all PluginExistsConstraint constraint violations in tests

Issue #3370684 by Abhijith S, apaderno: Change the description for DefaultPluginManager::__construct() to correctly report the created object

Issue #3322743 by Spokje, mondrake: Fix PHPStan L2 errors "Parameter $foo of method Foo::bar() has invalid type Foo\Baz." and "Method Foo::bar() has invalid return type Foo\Baz. "

Issue #3081646 by Spokje, mallezie, richardbporter, VladimirAus, RoSk0: Follow up for "Adding Assertions to Drupal - Test Tools"

Issue #3328443 by xjm, rpayanm, alexpott, catch, longwave: Replace most strpos() === 0 or !== 0 with str_starts_with()

Issue #2920682 by phenaproxima, alexpott, Sam152, borisson_, Wim Leers, larowlan: Add config validation for plugin IDs

Issue #3268818 by ravi.shankar, quietone: Fix class comment doc blocks in non tests 'Drupal.Commenting.DocComment.ShortSingleLine'

Issue #3314469 by alecsmrekar, plach: ContextDefinition::isSatisfiedBy does not take into account cardinality

Issue #3308449 by owenbush: CategorizingPluginManagerTrait::getSortedDefinitions() sometimes returns plugins in the incorrect order if they have categories or labels translated

Issue #3268829 by quietone, bbrala: Fix class property comments for Drupal.Commenting.DocComment.ShortSingleLine

Issue #3304256 by longwave, Spokje, dww, lauriii, catch, quietone, mherchel: Remove Bartik from Drupal core

Issue #3153956 by clayfreeman, Spokje, andypost, longwave: Remove code related to "context from configuration" that was deprecated in Drupal 9

Issue #3153852 by clayfreeman, catch: Both component and core versions of ContextAwarePluginBase need updated deprecation documentation

Issue #3027653 by clayfreeman, tim.plunkett, Pavel Ruban, raman.b, ankithashetty, cboyden, larowlan, mpotter, phenaproxima: Allow block and layout plugins to determine if they are being previewed

Issue #2616814 by dpi, Xano, geek-merlin, Hardik_Patel_12, jofitz, alexpott, Fabianx, catch, joachim, andypost, dawehner, daffie, cweagans, neclimdul: Delegate all hook invocations to ModuleHandler

Issue #3229714 by paul121: Correct visibility of getPluginDefinition function in ContextAwarePluginTrait

Issue #3222769 by bbrala, alexpott, longwave, Matroskeen: [November 8, 2021] Replace all list (array destructuring) assignment to the array syntax

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator