Issue #2552013 by Wim Leers: Follow-up for #2481453: ensure the 'url.query_args': MainContentViewSubscriber::WRAPPER_FORMAT cache context is set

Issue #2173527 by idflood, scresante, rpayanm, mgifford, Sam152, Wim Leers: The Menu-Toolbar area should be refactored so that Tray items are nested in the same container as their associated parent Toolbar item

Issue #2535118 by longwave, Wim Leers, borisson_, effulgentsia: Toolbar subtrees not working on admin pages due to lack of theme negotiation on Toolbar's custom JSONP route

Issue #2056089 by BarisW, TR, mgifford, rodvolpe, Dom., nambisolo, nod_, katewelling, Manjit.Singh, jhodgdon, Bojhan, Wim Leers: UI problems on the Modules/Extend page

Issue #2532490 by tim.plunkett, dawehner, Wim Leers, Crell, mtift: Unrouted URLs break toolbar but are hidden by caching

Issue #2424805 by mdrummond, YesCT, vijaycs85, xjm, marcoscano, ifrik, joelpittet, Jelle_S, attiks, lauriii: Toolbar can no longer switch horizontal and vertical -- expects breakpoints ordered from smallest to largest; responsive images need largest to smallest

Issue #2217985 by Berdir, Wim Leers: Replace the custom menu caching strategy in Toolbar with Core's standard caching

Issue #2511472 by Wim Leers, Fabianx, dawehner: Refactor all usages of drupal_render()/Renderer::render() that break #2450993

Issue #2498689 by lauriii, Wim Leers, David_Rothstein: "Back to site" link no longer appears in the toolbar

Issue #2254865 by Wim Leers, lauriii, borisson_, JeroenT, alexpott, Fabianx: toolbar_pre_render() runs on every page and is responsible for ~15ms/17000 function calls

Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)

Revert "Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)"

Oopsie. That was quite a bit more than I bargained for. ;)

This reverts commit 223f92b6.

Issue #2487704 by AlexB-appnovation, Bojhan, rudraram, zetagraph: Use underline as the focused state (not border left/bottom)

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

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 #2428703 by Wim Leers: Add a 'user.permissions' cache context (was: "Should cache contexts be able to associate a cache tag?")

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

Issue #2382561 by Sabreena, DickJohnson, aliyakhan, Tom Verhaeghe, emma.maria: In narrow viewports (<320px), the toolbar menu tray should be 100% width

Issue #2422363 by mortendk, joelpittet, davidhernandez: Rewrite the menu CSS components inline with our CSS standards

Issue #2260061 by Jelle_S, attiks, Wim Leers, mdrummond, mgifford, holist: Responsive image module does not support sizes/picture polyfill 2.2

Issue #2409427 by joelpittet, SteveK, sivaramakrishnan, skippednote, idebr: Toolbar vertical orientation link not expanding to fill the space

Issue #2350837 by dawehner, Berdir, larowlan, Wim Leers: Convert most usages of EntityInterface::getSystemPath() to use routes