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

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

Issue #3316274 by Wim Leers, catch, nod_, alexpott, longwave, bnjmnm: Stabilize FunctionalJavascript testing AJAX: add ::assertExpectedAjaxRequest()

Issue #3386458 by catch, quietone, alexpott, larowlan: Add GenericModuleTestBase and use it to test general module things

Issue #3362456 by NickDickinsonWilde, Wim Leers, borisson_: Fix all ExtensionExistsConstraint constraint violations in tests

Issue #2991772 by nuez, smustgrave, ravi.shankar, sanfair: Field layouts doen't seem to work for embedded forms

Issue #3273317 by clayfreeman, larowlan, tim.plunkett, danflanagan8: Add 'in_preview' variable to block and layout templates

Issue #3138078 by mondrake, larowlan, longwave, xjm: [D9.3 beta - w/c Nov 8, 2021] Add a 'void' return typehint to custom assert* methods

Issue #3207567 by Spokje, quietone, guilhermevp, yogeshmpawar, daffie, alexpott: Fix Drupal.Commenting.FunctionComment.MissingParamComment

Issue #3124762 by Spokje, dww, johnwebdev, paulocs, piyuesh23, Suresh Prabhu Parkala, Deepak Goyal, catch, larowlan, rpsu, xjm, andypost, alexpott, daffie, longwave, fgm, Wim Leers, anmolgoyal74: Add 'lifecycle' key to .info.yml files

Issue #3132745 by jungle, longwave, xjm, swatichouhan012, daffie: Fix Drupal.Array.Array.LongLineDeclaration coding standard for instances of the $modules test property

Issue #2822382 by voleger, pfrenssen, erozqba, jungle, RytoEX, borisson_, jofitz, shashikant_chauhan, sidharthap, dawehner, xjm, kiamlaluno, catch, daffie, klausi: Make every $modules property protected on classes extending BrowserTestBase and KernelTestBase

Issue #3107732 by mondrake, longwave, swatichouhan012, salah1, xjm, catch, alexpott, Berdir: Between April 13 and April 17, 2020: Add return typehints to setUp/tearDown methods in concrete test classes

Issue #3082655 by Wim Leers, alexpott, iyyappan.govind, dww, lauriii: Specify the $defaultTheme property in all functional tests

Issue #3072702 by alexpott, Wim Leers, mikelutz, xjm, catch, Berdir, tedbow, webchick, shaal, Mixologic, heddn: Core extensions should not need to specify the new core_version_requirement in *.info.yml files so that 9.0.x can be installed

Issue #3082644 by mikelutz, hchonov, tim.plunkett: Properly deprecate type => 'hidden' component handling and EntityDisplayBase::handleHiddenType

Issue #3073872 by tim.plunkett, starshaped, webchick, phenaproxima, worldlinemine, AaronMcHale, jrockowitz, ckrina: Allow for Layout Builder sections to be given administrative labels

Issue #3054317 by iuana, yogeshmpawar, Berdir: Move FieldLayoutEntityFormDisplay::getDefaultRegion() and FieldLayoutEntityViewDisplay::getDefaultRegion() to FieldLayoutEntityDisplayTrait

Issue #3053363 by alexpott, Wim Leers, Berdir, mondrake, xjm: Remove support for PHP 5 in Drupal 8.8

Issue #2904550 by tim.plunkett, Sam152, jwilson3, neclimdul, eelkeblok, amateescu, DuaelFr, K3vin_nl, alexpott, tedbow, andypost: PluginDependencyTrait::calculatePluginDependencies() does not handle theme provided plugins

Issue #2969109 by martin107, andypost, kaythay, Berdir: Replace deprecated usages of entityManager in form classes

Issue #2896215 by tim.plunkett, borisson_, Anybody, tacituseu: Formatter settings lost when moving fields between regions in 'Manage display'

Issue #2954776 by neclimdul, tim.plunkett, zenimagine, tedbow: Can not uninstall Field Layout while Layout Builder is installed

Revert "Issue #2822382 by voleger, pfrenssen, erozqba, RytoEX, borisson_, sidharthap, Jo Fitzgerald, shashikant_chauhan: Make every  property protected on classes extending BrowserTestBase and KernelTestBase"

This reverts commit 69501f30.

Issue #2822382 by voleger, pfrenssen, erozqba, RytoEX, borisson_, sidharthap, Jo Fitzgerald, shashikant_chauhan: Make every  property protected on classes extending BrowserTestBase and KernelTestBase

Issue #2942900 by Mixologic, vaplas, jibran, dawehner, Lendude, martin107, alexpott, tedbow, tacituseu, tstoeckler, heddn: Convert JavascriptTestBase Tests to use DrupalSelenium2Driver

Revert "Issue #2942900 by Mixologic, vaplas, jibran, Lendude, martin107, alexpott, dawehner, tedbow, tacituseu, tstoeckler, heddn: Convert JavascriptTestBase Tests to use DrupalSelenium2Driver"

This reverts commit f55d9746.

Issue #2942900 by Mixologic, vaplas, jibran, Lendude, martin107, alexpott, dawehner, tedbow, tacituseu, tstoeckler, heddn: Convert JavascriptTestBase Tests to use DrupalSelenium2Driver

Issue #2798891 by ankitjain28may, trobey, TR: Define project dependencies in core module .info files

Issue #2920394 by tim.plunkett: Field Layout should not alter fields placed into regions it doesn't know about

Issue #2660124 by tim.plunkett, samuel.mortenson, phenaproxima, tstoeckler, yoroy, dead_arm, xjm, Manuel Garcia, EclipseGc, larowlan, DyanneNova, tedbow: Dynamically build layout icons based on well formed config