Issue #2290103 by damiankloip, larowlan: Rename 'item_length' to 'view_mode' to aid discoverability.

Issue #1978976 by dawehner, kgoel, tim.plunkett, pcambra, longwave, Albert Volkman, vijaycs85, pfrenssen, jibran, Xano, David Hernández, shivachevva, kim.pepper, InternetDevels: Convert shortcut_set_switch to a Controller.

Issue #2288665 by znerol: Remove _maintenance request attribute and replace it with a maintenance mode service.

Issue #2292221 by er.pushpinderrana, andile2012: Fixed Remove extra ' in TextTrimmedFormatter.php annotation.

Issue #2277281 by dobe, amitgoyal, michaelfavia | drumm: Sometimes you want more than 128 chars of allowed file extensions.

Issue #2271485 by amitgoyal, Juanmamr | YesCT: Fixed Move LocaleStringTest $only_translated = array('untranslated' => FALSE); out of accidental comment.

Issue #1987418 by joelpittet, drupalninja99, rakhimandhania, Manuel Garcia, scor, shanethehat, Cottser, LinL, LewisNyman, minneapolisdan: User.module - Convert theme_ functions to Twig.

Issue #1529814 by mgifford, JohnAlbin, ibullock, dcmouyard, mark.labrecque, andrewmacpherson, vegantriathlete: Fixed skiplink behavior for Webkit browsers.

Issue #2293643 by joshi.rohit100: Fixed OpmlFeedAdd form still using url() instead of \Drupal::url().

This reverts commit 4b91f16d.

Issue #1956806 by amitgoyal, Cottser: Fixed DbLogController::overview() and topLogMessages() logic and provide a formatMessage() method.

Issue #662940 by rootwork, tim.plunkett, emclaughlin, sqndr, ogi: Fixed "Lucida Sans Unicode" may match ugly "Lucida Bright" instead of "Lucida Sans".

Issue #2218463 by znerol, damiankloip, rbayliss: Fixed Private file and image style downloads throw 500 error when page cache is active.

Issue #2225965 by lokapujya, djevans | scor: Move taxonomy term RDFa markup inside title_suffix (similar to the edit and node markup).

Issue #2290261 by tim.plunkett, amool: Fixed Full configuration export crashing without the php_fileinfo extension.

Issue #2170251 by lauriii, mgifford, joshi.rohit100, lokapujya, mparker17, Mirabuck, Jalandhar: Fixed Comment headings can spit out empty heading tags.