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

Issue #2992894 by mohit_aghera, adityasingh, adalbertov, raman.b, vsujeetkumar, mgifford, RenatoG, nishantghetiya, Kristen Pol, alexpott, penyaskito, andrewmacpherson, catch: Search results of multi-lingual pages fail Language of Parts

Issue #3008446 by alexpott, jcnventura, fenstrat, quietone, voleger, andypost: Complete the deprecation of format_date()

Issue #2662574 by RajeevK, Adita, pritish.kumar, afi13, greyghost, tstoeckler, xjm, Cottser, dawehner: Theme suggestions may not be in theme include files, Search and Views UI suggestions are not (always) found

Revert "Issue #2662574 by RajeevK, Adita, pritish.kumar, afi13, AjitS, greyghost: Theme suggestions may not be in theme include files, Search and Views UI suggestions are not (always) found"

This reverts commit 81d17351.

Issue #2662574 by RajeevK, Adita, pritish.kumar, afi13, AjitS, greyghost: Theme suggestions may not be in theme include files, Search and Views UI suggestions are not (always) found

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 #2557871 by alexpott: Remove all usages SafeMarkup::checkPlain() from template preprocess functions and attributes

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

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #2089331 by grom358 | thedavidmeister: [meta] Replace calls to check_plain() with Drupal\Component\Utility\String::checkPlain().

Issue #2246665 by jaredsmith, martin107, YesCT, filijonka, tstoeckler: Typehint with Drupal\Core\Language\LanguageInterface instead Drupal\Core\Language\Language.

Issue #2070369 by herom, bdgreen, Mac_Weber, InternetDevels, sidharthap, JeroenT: Remove all calls to deprecated function language().

Issue #1926344 by jhodgdon, maggo, mdrummond, alexpott, Cottser, dimboz | jenlampton: Consolidate search-result.html.twig and search-results.html.twig.

Revert "Issue #1926344 by jhodgdon, maggo, mdrummond, Cottser, dimboz | jenlampton: Consolidate search-result.html.twig and search-results.html.twig."

This reverts commit c83ff69e.

Issue #1926344 by jhodgdon, maggo, mdrummond, Cottser, dimboz | jenlampton: Consolidate search-result.html.twig and search-results.html.twig.

Issue #1987806 by kim.pepper, disasm, vijaycs85, tim.plunkett: Convert search_view() to a new style controller.

Issue #1751194 by Cottser, mikl, effulgentsia, benjifisher: Introduce hook_theme_suggestions_HOOK() and hook_theme_suggestions_HOOK_alter().

Issue #2089635 by tim.plunkett, disasm, larowlan: Convert non-test non-form page callbacks to routes and controllers.

Issue #2003482 by pwolanin, jhodgdon, kim.pepper, Nick_vh, tim.plunkett, jibran, Berdir, effulgentsia, alexpott: Convert hook_search_info() to plugin system.

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #1668866 by ParisLiakos, aspilicious, tim.plunkett, pdrake, g.oechsler, dawehner, Berdir, corvus_ch, damiankloip, disasm, marcingy, neclimdul: Replace drupal_goto() with RedirectResponse.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1898448 by julien, drupalway, podarok, jenlampton, steveoliver, joelpittet, jwilson3, chrisjlee, Cottser | c4rl: Convert search module to Twig.

Issue #1817484 by tomgeekery, kiamlaluno: Fixed The function contains a 'return' statement right at the end of the function.

Using the language_manager wrapper function to return a language whether or not we're in the requet scope

- Patch #1290694 by hefox, tlattimore, c4rl, chx, tim.plunkett, tstoeckler, msonnabaum: provide consistency for attributes and classes arrays provided by template_preprocess().

- Patch #1510686 by cosmicdreams, vasi1186, webflo, disasm: replace remaining references to global () with drupal_container().

Issue #965300 by Gábor Hojtsy, xjm: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE.