refactor: added new ajaxify method .cleanup, called before ajaxify.start.

public/src/ajaxify.js

@@ -44,9 +44,7 @@ ajaxify.widgets = { render: render };
 			quiet = true;
 		}
 
-		app.leaveCurrentRoom();
+		ajaxify.cleanup(url, ajaxify.data.template.name);
-
-		$(window).off('scroll');
 
 		if ($('#content').hasClass('ajaxifying') && apiXHR) {
 			apiXHR.abort();
@@ -456,6 +454,12 @@ ajaxify.widgets = { render: render };
 		});
 	};
 
+	ajaxify.cleanup = (url, tpl_url) => {
+		app.leaveCurrentRoom();
+		$(window).off('scroll');
+		hooks.fire('action:ajaxify.cleanup', { url, tpl_url });
+	};
+
 	require(['translator', 'benchpress'], function (translator, Benchpress) {
 		translator.translate('[[error:no-connection]]');
 		translator.translate('[[error:socket-reconnect-failed]]');