Issue #2458413 by Wim Leers: BlockViewBuilder should specify cache contexts even for uncacheable blocks

Issue #2443073 by Wim Leers, joshtaylor: Add #cache[max-age] to disable caching and bubble the max-age

Issue #2329101 by Wim Leers: CacheableInterface only has a getCacheKeys() method, no getCacheContexts(), leads to awkward implementations

Issue #2318437 by Wim Leers, Gábor Hojtsy, geertvd: Replace the hardcoded langcode key on blocks with the 'language' cache context

Issue #2349625 by mortendk, alexpott, lauriii, Manuel Garcia, saki007ster, emma.maria, DickJohnson: Copy block templates to Classy

Issue #2379741 by Wim Leers, damiankloip: Add Renderer::getCacheableRenderArray() to encapsulate which data is needed for caching a render array and have views use it

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

Issue #2347999 by Mile23, daffie, cs_shadow, cosmicdreams: DrupalUnitTestBase is deprecated, replace with KernelTestBase

Issue #2318755 by LinL, Devin Carlson, effulgentsia, catch: Block Module: Fix documentation that refers to enabling/disabling of modules

Issue #1972122 by akalata, mortendk, JamesLefrère, pakmanlh, ckrina, sun: Remove the DIV tag around block content.

Issue #2340123 by Wim Leers: Setting cache tags can be tricky: use strings instead of nested arrays to improve DX.

Issue #2328913 by lanchez, lauriii, joelpittet | crowdcg: Move block classes out of preprocess and into templates.

Issue #2321593 by Temoor: Replace all instances of block_load(), entity_load('block') and entity_load_multiple('block') with static method calls.

Issue #2121713 by tim.plunkett, dawehner, rteijeiro, jiv_e: Move drupal_html_id() and drupal_html_class() to Drupal\Component\Utility.

Issue #2284103 by alexpott, fabpot, damiankloip, Xano, Xen, Berdir: Fixed Remove the request from the container.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #1989568 by Berdir: Remove block config ID from being used as an HTML ID or template suggestion.

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

Issue #1167248 by Berdir, damiankloip, Alan Evans, beejeebus, catch: Add CacheBackendInterface::setMultiple().

Issue #2185617 by Wim Leers, voidberg, drifter: Each page cache entry should have a theme cache tag.

Issue #2158003 by Wim Leers, msonnabaum, effulgentsia, moshe weitzman: Remove Block Cache API in favor of blocks returning #cache with cache tags.