Added app.newTopic

Make a new topic from anywhere. #4223

public/src/app.js

@@ -34,7 +34,9 @@ app.cacheBuster = null;
 				app.handleSearch();
 			}
 
-			handleNewTopic();
+			$('#content').on('click', '#new_topic', function(){
+				app.newTopic();
+			});
 
 			require(['components'], function(components) {
 				components.get('user/logout').on('click', app.logout);
@@ -455,9 +457,8 @@ app.cacheBuster = null;
 		});
 	};
 
-	function handleNewTopic() {
-		$('#content').on('click', '#new_topic', function() {
-			var cid = ajaxify.data.cid;
+	app.newTopic = function (cid) {
+		cid = cid || ajaxify.data.cid;
 		if (cid) {
 			$(window).trigger('action:composer.topic.new', {
 				cid: cid
@@ -477,8 +478,7 @@ app.cacheBuster = null;
 				}
 			});
 		}
-		});
-	}
+	};
 
 	app.loadJQueryUI = function(callback) {
 		if (typeof $().autocomplete === 'function') {