Issue #2152229 by steveoliver, rteijeiro, joelpittet, JeroenT, InternetDevels, michamilz, burgerboydaddy, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_textarea() to Twig

Issue #2152213 by steveoliver, joelpittet, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_form_element() to Twig

Issue #2152231 by rteijeiro, steveoliver, joelpittet, hussainweb, shanethehat, jenlampton, kpa, AnythonyR, EVIIILJ, kgoel, Cottser, dsdeiz, hanpersand: Convert theme_vertical_tabs() to Twig

Somehow this broke PHPUnit, so rolling back for now.

This reverts commit 91b465bd.

Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, alexpott, larowlan, Damien Tournoud: Replace almost all remaining superglobals (, , etc.) with Symfony Request object.

Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, larowlan, Damien Tournoud: Replace all remaining superglobals (, , etc.) with Symfony Request object.

Issue #2121775 by jessebeach: Make the markup associated with the required star on field items silent.

Issue #675446 by mgifford, RobLoach, amateescu, nod_, longwave, oxyc, rteijeiro, tomyouds, Jelle_S, mcrittenden, Sutharsan, hansyg, Angry Dan, clemens.tolboom, droplet | Dave Reid: Change notice: Use jQuery UI Autocomplete.

Issue #2048223 by dawehner, ParisLiakos, herom, fubhy, damiankloip, vijaycs85, joelpittet, tim.plunkett: Add $account argument to AccessCheckInterface::access() method and use the current_user() service.

Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor).

Revert "Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor)."

This reverts commit 46db1365.

Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor).

Issue #2089327 by thedavidmeister, Cyberschorsch: Remove / deprecate calls to drupal_strip_dangerous_protocols() use \Drupal\Component\Utility\Url::stripDangerousProtocols().

Issue #2089351 by thedavidmeister, meba: Convert all calls to check_plain() in core to Drupal\Component\Utility\String::checkPlain() in core/includes.

Issue #1793648 by nod_, kmox83, droplet, rteijeiro: Follow-up: replace all occurence of Drupal.settings with drupalSettings.

Issue #2056627 by dawehner, tim.plunkett: Fixed Regression, Form API autocomplete is broken for routes.

Issue #2047075 by Caecus, mgifford, jessebeach, larowlan: Mark invalid form field with [aria-invalid=true].

Issue #2045923 by drupalrv, tim.plunkett: Replace all module_invoke_all() deprecated function calls in procedural code.

Issue #1987602 by glennpratt, juampy, pwieck, vijaycs85, dawehner, tim.plunkett, effulgentsia: Convert ajax_form_callback() to a new style controller.

Issue #2052389 by pwolanin: Fixed All elements added to the Request attributes should have a _ prepended unless they come from the path.

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