closes #4299

public/src/client/chats.js

@@ -376,7 +376,7 @@ define('forum/chats', ['components', 'string', 'sounds', 'forum/infinitescroll',
 		Chats.onChatEdit();
 
 		socket.on('event:chats.roomRename', function(data) {
-			$('[component="chat/room/name"]').val(data.newName);
+			$('[component="chat/room/name"]').val($('<div/>').html(data.newName).text());
 		});
 	};
 

public/src/modules/chat.js

@@ -71,7 +71,7 @@ define('chat', ['components', 'taskbar', 'string', 'sounds', 'forum/chats', 'tra
 		});
 
 		socket.on('event:chats.roomRename', function(data) {
-			module.getModal(data.roomId).find('[component="chat/room/name"]').val(data.newName);
+			module.getModal(data.roomId).find('[component="chat/room/name"]').val($('<div/>').html(data.newName).text());
 		});
 
 		Chats.onChatEdit();

src/messaging/rooms.js

@@ -147,7 +147,10 @@ module.exports = function(Messaging) {
 		if (!newName) {
 			return callback(new Error('[[error:invalid-name]]'));
 		}
-
+		newName = newName.trim();
+		if (newName.length > 75) {
+			return callback(new Error('[[error:chat-room-name-too-long]]'));
+		}
 		async.waterfall([
 			function (next) {
 				Messaging.isRoomOwner(uid, roomId, next);