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

Issue #2040135 by Wim Leers, Berdir: Caches dependent on simple config are only invalidated on form submissions

Issue #2387973 by tibbsa, hussainweb: Clean-up toolbar module test members - ensure property definition and use of camelCase naming convention

Issue #2207629 by droplet, tarekdj, Devin Carlson, rpayanm: Update matchMedia library to latest release

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

git commit -m 'Issue #2377397 by Wim Leers, alexpott: Themes should use libraries, not individual stylesheets'

Issue #2349871 by borisson_, Wim Leers, Arjandew: Vertical toolbar menu is broken in narrow viewports

Issue #1855066 by Tom Verhaeghe, Wim Leers, benjifisher: In the "menu" toolbar tray, clicking/tapping white space should show the child level