disable user typing notifications when feature is disabled

bigbluebutton-html5/imports/ui/components/chat/message-form/component.jsx

@@ -68,7 +68,8 @@ const messages = defineMessages({
   },
 });
 
-const CHAT_ENABLED = Meteor.settings.public.chat.enabled;
+const CHAT_CONFIG = Meteor.settings.public.chat;
+const CHAT_ENABLED = CHAT_CONFIG.enabled;
 
 class MessageForm extends PureComponent {
   constructor(props) {
@@ -87,6 +88,7 @@ class MessageForm extends PureComponent {
     this.handleSubmit = this.handleSubmit.bind(this);
     this.setMessageHint = this.setMessageHint.bind(this);
     this.handleUserTyping = _.throttle(this.handleUserTyping.bind(this), 2000, { trailing: false });
+    this.typingIndicator = CHAT_CONFIG.typingIndicator.enabled;
   }
 
   componentDidMount() {
@@ -197,7 +199,7 @@ class MessageForm extends PureComponent {
 
   handleUserTyping(error) {
     const { startUserTyping, chatId } = this.props;
-    if (error) return;
+    if (error || !this.typingIndicator) return;
     startUserTyping(chatId);
   }
 
@@ -250,12 +252,14 @@ class MessageForm extends PureComponent {
     div.appendChild(document.createTextNode(msg));
     msg = div.innerHTML;
 
+    const callback = this.typingIndicator ? stopUserTyping : null;
+
     return (
       handleSendMessage(msg),
       this.setState({
         message: '',
         hasErrors: false,
-      }, stopUserTyping)
+      }, callback)
     );
   }