Issue #3364506 by Wim Leers, effulgentsia, catch, lauriii, borisson_, smustgrave, tim.plunkett, Dave Reid: Add optional validation constraint support to ConfigFormBase

Issue #2937515 by Spokje, quietone, idebr, longwave, SherFengChong, anweshasinha, borisson_, mfernea, xjm, bbrala, daffie, Berdir: Fix Drupal.Array.Array.[ArrayClosingIndentation, ArrayIndentation] coding standard

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

Issue #2886622 by Berdir, martin107, Mile23, tim.plunkett, mikelutz, jonathan1055: Deprecate all EntityManager methods with E_USER_DEPRECATED

Issue #2572613 by Malevi4, idebr, pfrenssen, Mile23, RajeevK: Fix 'Drupal.Array.Array.CommaLastItem' coding standard

Issue #2849669 by alexpott, pwolanin, Munavijayalakshmi, dawehner: Fix \Drupal\Component\Utility\Unicode() because of the Symfony mbstring polyfill

Issue #2935256 by Jo Fitzgerald, voleger, kim.pepper, ibustos, Yogesh Pawar, catch, jibran: Remove all usages of drupal_get_message and drupal_set_message in modules

Issue #2572795 by mfernea, zaporylie, pfrenssen, andypost, attiks, alexpott, xjm, Mile23, catch, borisson_: Fix coding standard for closures - Drupal.WhiteSpace.ScopeClosingBrace and Generic.Functions.OpeningFunctionBraceKernighanRitchie

Revert "Issue #2572795 by mfernea, pfrenssen, attiks, andypost, alexpott, xjm, Mile23, catch, borisson_: Fix coding standard for closures - Drupal.WhiteSpace.ScopeClosingBrace and Generic.Functions.OpeningFunctionBraceKernighanRitchie"

This reverts commit c422bdfa.

Issue #2572795 by mfernea, pfrenssen, attiks, andypost, alexpott, xjm, Mile23, catch, borisson_: Fix coding standard for closures - Drupal.WhiteSpace.ScopeClosingBrace and Generic.Functions.OpeningFunctionBraceKernighanRitchie

Issue #2873696 by nvexler, wengerk, gido, Jo Fitzgerald, xjm: Add @internal to core classes, methods, properties to Form Classes

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk, olli: Remove all usages SafeMarkup::checkPlain() from render arrays

Revert "Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk: Remove all usages SafeMarkup::checkPlain() from render arrays"

This reverts commit 31007609.

Issue #2560641 by alexpott, lauriii, Xano, borisson_, ianthomas_uk: Remove all usages SafeMarkup::checkPlain() from render arrays

Issue #2506195 by alexpott, joelpittet, xjm, David_Rothstein, Fabianx, pwolanin: Remove SafeMarkup::set() from Xss::filter()

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

Issue #2420737 by rodrigoaguilera, Pere Orga, Gábor Hojtsy, maxocub, jhodgdon, penyaskito, plach, danigrrl: Differences in dynamic language names are confusing in views, content, etc

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

Issue #2422685 by balagan: Language negotiation configuration page titles inconsistent, should not even mention "negotiation"

Issue #2408977 by geertvd: Fatal error: Cannot access protected property Drupal\block\Entity\Block::$id

Issue #2392319 by alexpott, effulgentsia: Config objects (but not config entities) should by default be immutable

Issue #2347465 by tim.plunkett, dawehner, cilefen: Convert all instances of #type link/links to convert to use routes.

Issue #1182850 by xjm, Stefan Lehmann, jmcintyre, Bojhan: Remove full stops at the end of checkbox options.

Issue #1976158 by Berdir | msonnabaum: Rename entity storage/list/form/render "controllers" to handlers.

Issue #2203407 by nod_, sun: Replace #attached library array values with provider-namespaced strings.

Issue #2102477 by alexpott: Convert remainder of language negotiation settings to configuration system.