Issue #2596083 by Wim Leers, lokapujya, jamin_melville: Allowed attribute 'class' not respected in CKEditor: ACF strips it

Issue #2502621 by Pravin Ajaaz, hussainweb, Peacog, jhodgdon, ivanjaros: Replace implement notes with inheritdoc tag

Issue #2549077 by pwolanin, Wim Leers, phenaproxima, lauriii: Allow the "Limit allowed HTML tags" filter to also restrict HTML attributes, and only allow a small whitelist of attributes by default

Issue #2563543 by aneek, Wim Leers: CKEditor Toolbar - various button issues when the language is RTL

Issue #2548723 by Wim Leers, cwells: Comment on or replace class name cleaning in CKEditorPlugin/Internal::getButtons()

Issue #2501711 by cwells, alexpott: Remove or document SafeMarkup::set in template_preprocess_ckeditor_settings_toolbar

Issue #2361681 by Wim Leers: drupal_render(): invert second argument ($is_recursive_call -> $is_root_call) => more strict, better DX/TX.

Issue #2217877 by Wim Leers, Dave Reid, damiankloip, xjm, chx | catch: Fixed Text filters should be able to add #attached, #post_render_cache, and cache tags.

Issue #2207777 by Wim Leers, pjonckiere, Rajesh Ashok | alexpott: Can not configure editor whilst creating a new text format.

Issue #2030605 by tim.plunkett, mr.baileys, webwarrior, Wim Leers | plopesc: Expand Editor with methods.

Issue #2204129 by Wim Leers, tim.plunkett: Store the filter format on the editor entity during runtime.

Issue #2099741 by Wim Leers, wwalc, mr.baileys, eaton, dstol, nod_, effulgentsia: Protect WYSIWYG Editors from XSS Without Destroying User Data.

Issue #2184315 by Wim Leers: Move filter_get_filter_types_by_format() and filter_get_html_restrictions_by_format() onto FilterFormatInterface.

Issue #2170085 by Wim Leers, jessebeach: Caption filter may not wrap images that are only aligned, not captioned.

Issue #2162685 by clemens.tolboom: CKEditor's Internal::generateFormatTagsSetting() should call check_markup() with caching enabled.

Issue #1872206 by jessebeach, quicksketch, Wim Leers, mgifford: Fixed Improve CKEditor toolbar configuration accessibility.

Issue #1847002 by tim.plunkett, effulgentsia, msonnabaum: Move entity type classes from Drupal$provider\Plugin\Core\Entity to Drupal$provider\Entity.

Issue #1907418 by quicksketch, Wim Leers: Make CKEditor's alignment + underline buttons available (but not enabled by default).

Issue #1879120 by quicksketch, Wim Leers, larowlan, frega: Use Drupal-specific image and link plugins — use core dialogs rather than CKEditor dialogs, containing alterable Drupal forms.

Issue #1936392 by Wim Leers: Configure CKEditor's 'Advanced Content Filter' (ACF) to match Drupal's text filters settings.

Issue #2006278 by Wim Leers: Remove leftover 'module' annotation keys and plugin manager processDefinition() to deal with disabled modules during tests.

Issue #1987298 by tim.plunkett, quicksketch: Shorten directory structure and PSR-0 namespacing for plugins.

Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.

Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia: Added CKEditor module to core.