Issue #2063191 by larowlan, marthinal: Fixed Menu items do not save if the menu path is an alias.
Issue #2067427 by Wim Leers: Fixed Drupal.editors.ckeditor.attachInlineEditor() should pass Drupal-specific settings like Drupal.editors.ckeditor.attach() does.
Issue #2072181 by dawehner, tim.plunkett: Change title in blocks form for items_per_page().
Issue #1978932 by laurentchardin, kbentham: Convert overlay_ajax_render_region() to a Controller.
Issue #1889644 by Berdir: Convert drupal_mail_system() to a MailFactory service to allow more flexible replacements.
Issue #2068269 by dawehner: Use _content where possible in views_ui().routing.yml.
Issue #2061835 by thedavidmeister, Cottser: Fixed theme() doesn't enforce that what it returns is a string or FALSE.
Issue #2057869 by dawehner, jibran: Provide an alias for 'plugin.manager.entity' called 'entity.manager'.