Issue #2861840 by tim.plunkett, lauriii: Preprocess functions are not merged when a module registers a theme hook for a theme-provided template

Issue #2914595 by _gradient_: \Drupal\Core\Theme\ThemeInitialization declares $moduleHandler dynamically

Issue #2704871 by pepegarciag, Mile23, Manuel Garcia, ieguskiza, snehi, gaurav.pahuja, dimaro, rajeshwari10, gargsuchi, pashupathi nath gajawada, penyaskito, xjm, ZeiP, Wim Leers, alexpott: Replace usages of deprecated method drupal_render()

Issue #2472337 by damiankloip, alexpott, Jo Fitzgerald, dawehner, bojanz, Wim Leers: Provide a lazy alternative to service collectors which just detects service IDs

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 #2559825 by tim.plunkett, Antti J. Salminen, lauriii, aspilicious, alexpott: Preprocess functions from base hooks not triggered for theme hooks not using the __  pattern

Revert "Issue #2704871 by pepegarciag, ieguskiza, snehi, gaurav.pahuja, rajeshwari10, dimaro, gargsuchi, pashupathi nath gajawada, penyaskito, Manuel Garcia, Mile23: Replace usages of deprecated method drupal render()"

This reverts commit ae3ee317.

Issue #2704871 by pepegarciag, ieguskiza, snehi, gaurav.pahuja, rajeshwari10, dimaro, gargsuchi, pashupathi nath gajawada, penyaskito, Manuel Garcia, Mile23: Replace usages of deprecated method drupal render()

This reverts commit d189ff05.

This reverts commit 4a95e650.

Issue #2745953 by dawehner, tim.plunkett, Wim Leers: AjaxBasePageNegotiator should not require _theme: ajax_base_page to be specified

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2707641 by alexpott, anoopjohn: Ensure core compliance to Drupal.Commenting.FunctionComment.ParamCommentIndentation (part 2)

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2676026 by dimaro, subharanjan, Girish-jerk, zaurav, jhodgdon: Correct documentation of ThemeNegotiatorInterface

Issue #2388247 by pguillard, snehi, joelpittet, sriharsha.uppuluri: Documentation refers to _theme() function, which has been removed

Issue #2614014 by joelpittet, alexpott, dawehner, Cottser, LewisNyman: Progress bar, fieldsets, messages broken in the installer due to theme ordering bug

Issue #2497667 by almaudoh, Wim Leers, Cottser, Fabianx, jaxxed: Add libraries-extend to themes' *.info.yml

Issue #2451411 by almaudoh, Shamsher_Alam, lauriii, borisson_, cilefen, davidhernandez, Cottser, Wim Leers, joelpittet: Add libraries-override to themes' *.info.yml

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

Issue #2493989 by Antti J. Salminen, lauriii, slashrsm: template_preprocess() and other preprocess functions are called even for theme hooks implemented as functions

Issue #2556785 by Antti J. Salminen, lauriii: Specific preprocess functions doesn't support second level without first level

Issue #939462 by lauriii, Antti J. Salminen, NROTC_Webmaster, mbrett5062, tim.plunkett, tostinni, rteijeiro, dvessel, cilefen, barraponto, theapi, joelpittet, Xano, tuutti, drzraf, Fabianx, markcarver, xjm, catch, Cottser, sun, jenlampton, effulgentsia, davidhernandez, kscheirer, akalata, andypost, hass, rooby, jhodgdon, fubhy, becw, MXT, mlncn, lemunet, chriscalip, mike stewart, PavanL, kevinquillen, gleroux02: Specific preprocess functions for theme hook suggestions are not invoked

Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender

Revert "Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender"

This reverts commit 9ccb44e2.

Issue #2501931 by alexpott, alimac, cmanalansan, davidhernandez, scotself, cilefen, RavindraSingh, peezy, YesCT, pwolanin: Remove SafeMarkup::set in twig_render_template() and ThemeManager and FieldPluginBase:advancedRender

Issue #1885564 by joelpittet, SebCorbin, Cottser, mpdonadio, David_Rothstein, drupalninja99, jenlampton, lauriii, rteijeiro, mbrett5062, akalata, Devin Carlson, trevorkjorlien, longwave, socketwench, shanethehat, aboros: theme.maintenance.inc (authorize.php) - Convert theme_ functions to Twig