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

Issue #2912363 by tim.plunkett, pwolanin: LocalTaskDefault/LocalActionDefault ignore parameters when raw parameters are not present

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 #2576533 by alexpott, stefan.r, Wim Leers, dawehner, xjm, effulgentsia, catch: Rename SafeStringInterface to MarkupInterface and move related classes

Issue #2569069 by stefan.r, mr.baileys, alexpott, lauriii: Replace TranslationWrapper with TranslatableString and deprecate TranslationWrapper

Issue #2511516 by lauriii, Xano, Wim Leers, dawehner: Make local tasks and actions hooks provide cacheability metadata, to make the blocks showing them cacheable

Issue #2338081 by pwolanin, dawehner, effulgentsia, kgoel, vijaycs85, mpdonadio, chx, brandon.holtsclaw, alexpott, Gábor Hojtsy, Fabianx, catch, YesCT, JvE: Local Tasks, Actions, and Contextual links mark strings from derivatives (or alter hooks) as safe and translated

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 #2294157 by tim.plunkett, dawehner: Switch getOptions() and getRouteParameters() within LocalActionInterface and LocalTaskInterface to use RouteMatch

Issue #2120235 by dawehner, YesCT: Regression: routing / tabs / actions / contextual links lack way to attach replacement arguments to UI strings.

Issue #2107531 by pwolanin, neclimdul, cilefen, dawehner, YesCT, tim.plunkett: Improve DX of local task YAML definitions.

Issue #2114069 by dawehner, Gábor Hojtsy, ursula: Fixed Routing / tabs / actions lack way to attach context to UI strings.

Issue #1972990 by pwolanin, Dean Reilly, dawehner, Jberges, dokumori, AjitS, tim.plunkett: Convert tracker_page() to a Controller.

Issue #2095223 by pwolanin, tim.plunkett: Remove t() from LocalTaskDefault now that it's in PluginBase.

Issue #2076283 by dawehner, pwolanin, neclimdul: Allow local task plugins on paths with a dynamic value (like a node).

Issue #2087231 by tim.plunkett, pwolanin: Add a PluginBase in the Core namespace with t() as a helper method.

Issue #2050919 by neclimdul, pwolanin, damiankloip, dawehner: Replace local task plugin discovery with YamlDiscovery.

Issue #2031473 by pwolanin, fubhy, dawehner, tim.plunkett: Convert menu local actions to plugins so that we can generate dynamic titles and paths.