Issue #2472323 by dawehner, neclimdul, Crell, kim.pepper, nod_, Wim Leers, larowlan, jibran, pwolanin, catch: Move modal / dialog to query parameters
Issue #2066445 by mparker17, rpayanm, aspilicious, tkuldeep17, adci_contributor, Mile23, vijaycs85, alvar0hurtad0, rahulbile, andypost, valthebald: Convert a bunch of AjaxResponse callbacks in system.module's test's ajax_test.module to a new style controller
Issue #1987612 by valthebald, Mile23, aspilicious, Pinolo, InternetDevels: Convert ajax_test_dialog_contents() to a new style controller
Issue #2368797 by Wim Leers, dawehner, rteijeiro: Optimize ajaxPageState to keep Drupal 8 sites fast on high-latency networks, prevent CSS/JS aggregation from taking down sites and use HTTP GET for AJAX requests
Issue #2347465 by tim.plunkett, dawehner, cilefen: Convert all instances of #type link/links to convert to use routes.
