Issue #1898458 by widukind, Cottser, c4rl: [READY] theme_test().module - Convert PHPTemplate templates to Twig.

Issue #1993312 by damiankloip, tim.plunkett: Change pre_render(), post_render(), and after_build() callbacks to accept callables.

Issue #1957888 by ParisLiakos, Berdir: Fixed Exception when a field is empty on programmatic creation.

Issue #1981912 by kostajh, theMusician,  Justin M. Woodum: Make reference to INSTALL.txt in system_requirements link to the file when displayed.

Issue #1893442 by andypost, tim.plunkett, dawehner: Move BlockStorageController::loadByProperties() into ConfigStorageController.

Issue #1942174 by vijaycs85: Fixed Make Toolbar module active config save format match the default yml file.

Issue #1995730 by Wim Leers: Drupal.editors.ckeditor.onChange() misses changes made by last keypress — leads to data loss.

Issue #914382 by Wim Leers, Cottser, Gábor Hojtsy, franz, droplet, sun, Niklas Fiekas, catch, dawehner, effulgentsia: Fixed Contextual links incompatible with render cache.

Issue #1991088 by alexpott: Fixed Test info not displayed for PHPUnit tests when using run-tests.sh.

Issue #1920886 by Cottser, Fabianx: Drupal_render() should only render the child elements when rendering a 'render element' for the first time.

Issue #1872522 by chx, effulgentsia, sun, aspilicious, desmondmorris, Berdir, jibran, YesCT: Fixed Compiled data in PHP storage is cleared too late in drupal_flush_all_caches().

Issue #1994910 by tim.plunkett, twistor: Fixed ConfigEntity listing should only show enable/disable if status is supported.

Issue #680546 followup by swentel, Cottser, sun: [Followup] Add a custom 'number of values' for 'multiple / multi-value' field. (e.g. nodereference, imagefield).

Issue #1946454 by andypost, kim.pepper, tim.plunkett, ParisLiakos: Convert all confirm_form() in system.module and system.admin.inc to the new form interface and convert route.