Issue #2031641 by aburrows, lauriii, nlisgo, Pol, redsquid, tuutti, LewisNyman, akalata, agviu, kallehauge, _nolocation, rpayanm, saki007ster, mdrummond, RavindraSingh, brahmjeet789: Change active class to is-active

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

Issue #2273923 by mpdonadio, pfrenssen, effulgentsia, pcambra, xjm, tim.plunkett, martin107, cilefen: Remove html => TRUE option from l() and link generator

Issue #2407933 by romina.nayak, adci_contributor, sidharrell, sinniger, arpit_nnd: Move all menu-related hooks and topic to new menu.api.php file

Revert "Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator"

This reverts commit 0bcabf50.

Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator

Issue #2381509 by er.pushpinderrana, dawehner: Fix docs for _content being _controller in routing.yml files

Issue #2359035 by metzlerd: Add info to Routing topic about magic placeholder transformation to parameters in method

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

Issue #1869476 by rteijeiro, LewisNyman, lauriii, Wim Leers, mdrummond, swentel, hosef, cbiggins, larowlan, sun, EclipseGc, Gábor Hojtsy: Convert global menus (primary links, secondary links) into blocks.

Issue #1777332 by hass, Cottser, mike.roberts, joelpittet, dawehner | jenlampton: Replace theme_menu_link() and menu-tree.html.twig with a single Twig template.

Issue #2310341 by ilkkave | YesCT: Remove backwards compatibility for $heading['class'] in template_preprocess_menu_tree().

Issue #1898478 by joelpittet, Cottser, lokapujya, m1r1k, jstoller, er.pushpinderrana, duellj, organicwire, jessebeach, idflood, Jalandhar, Risse, derheap, galooph, mike.roberts, tlattimore, nadavoid, LinL, steveoliver, chakrapani, likin, killerpoke, EVIIILJ, vlad.dancer, podarok, m86 | c4rl: Menu.inc - Convert theme_ functions to Twig.

Issue #2301317 by pwolanin, dawehner, Wim Leers, effulgentsia, YesCT, xjm, alexpott: MenuLinkNG part4: Conversion.

Revert "Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion."

This reverts commit fd2db9cd.

Issue #2301317 by pwolanin, effulgentsia, Wim Leers, dawehner, alexpott: MenuLinkNG part4: Conversion.

Issue #2238217 by effulgentsia, neclimdul, martin107, tim.plunkett, cweagans, kim.pepper, xjm: Introduce a RouteMatch class.

Issue #2124957 by Wim Leers, catch: Replace 'content' cache tag with 'rendered' and use it sparingly.

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

Issue #2214209 by dawehner, ParisLiakos, xjm: Move _menu_site_is_offine() into the Maintainance subscriber.

Issue #2271025 by Wim Leers: Don't let menu_navigation_links() set the active class, the drupal.active-links library does that for us (plus, it's setting it incorrectly).

Issue #2183113 by jhodgdon, effulgentsia, tim.plunkett, herom, larowlan: Update hook_help signature to use route_name instead of path.

Issue #2243549 by agerson, cs_shadow | jhodgdon: Text changes needed as follow-up to Menu UI module rename.

Issue #2241655 by tim.plunkett: EntityStorageInterface::create() should always create a "new" entity.

This reverts commit 07f63fe6.