Fixed timer for mark conversation read

Author: tijmenNL

src/app/components/Chat.js

@@ -112,7 +112,7 @@ const Chat = (props) => {
 
  const componentJustMounted = useRef(true);
 
- this.timer = null
+ let timer = null
  useEffect(() => {
  setSelectedUri(props.focusOn);
  }, [props.focusOn]);
@@ -359,10 +359,10 @@ const Chat = (props) => {
  timestamp,
  state
  );
- if (this.timer !== null) {
- clearTimeout(this.timer);
+ if (timer !== null) {
+ clearTimeout(timer);
  }
- this.timer = setTimeout(() => {
+ timer = setTimeout(() => {
  let sendMark = true;
  for (let message of messages[uri]) {
  if (message.state === 'received'
@@ -381,7 +381,7 @@ const Chat = (props) => {
  setUnread(uri)
  }
  props.account.markConversationRead(uri);
- this.timer = null;
+ timer = null;
  }
  }, 500);
  };