Public Room - Green line “new message” line appears when scrolling up quickly

src/pages/home/report/ReportActionsList.tsx

@@ -13,6 +13,7 @@ import {AUTOSCROLL_TO_TOP_THRESHOLD} from '@components/InvertedFlatList/BaseInve
 import {PersonalDetailsContext, usePersonalDetails} from '@components/OnyxListItemProvider';
 import ReportActionsSkeletonView from '@components/ReportActionsSkeletonView';
 import useCurrentUserPersonalDetails from '@hooks/useCurrentUserPersonalDetails';
+import useIsAnonymousUser from '@hooks/useIsAnonymousUser';
 import useLocalize from '@hooks/useLocalize';
 import useNetworkWithOfflineStatus from '@hooks/useNetworkWithOfflineStatus';
 import useOnyx from '@hooks/useOnyx';
@@ -202,6 +203,7 @@ function ReportActionsList({
     const shouldFocusToTopOnMount = useMemo(() => isTransactionThreadReport || isMoneyRequestOrInvoiceReport, [isMoneyRequestOrInvoiceReport, isTransactionThreadReport]);
     const topReportAction = sortedVisibleReportActions.at(-1);
     const [shouldScrollToEndAfterLayout, setShouldScrollToEndAfterLayout] = useState(shouldFocusToTopOnMount && !reportActionID);
+    const isAnonymousUser = useIsAnonymousUser();
 
     useEffect(() => {
         const unsubscribe = Visibility.onVisibilityChange(() => {
@@ -267,6 +269,10 @@ function ReportActionsList({
      * The reportActionID the unread marker should display above
      */
     const [unreadMarkerReportActionID, unreadMarkerReportActionIndex] = useMemo(() => {
+        if (isAnonymousUser) {
+            return [null, -1];
+        }
+
         // If there are message that were received while offline,
         // we can skip checking all messages later than the earliest received offline message.
         const startIndex = earliestReceivedOfflineMessageIndex ?? 0;
@@ -296,13 +302,17 @@ function ReportActionsList({
         }
 
         return [null, -1];
-    }, [accountID, earliestReceivedOfflineMessageIndex, prevSortedVisibleReportActionsObjects, sortedVisibleReportActions, unreadMarkerTime]);
+    }, [accountID, isAnonymousUser, earliestReceivedOfflineMessageIndex, prevSortedVisibleReportActionsObjects, sortedVisibleReportActions, unreadMarkerTime]);
     prevUnreadMarkerReportActionID.current = unreadMarkerReportActionID;
 
     /**
      * Subscribe to read/unread events and update our unreadMarkerTime
      */
     useEffect(() => {
+        if (isAnonymousUser) {
+            return;
+        }
+
         const unreadActionSubscription = DeviceEventEmitter.addListener(`unreadAction_${report.reportID}`, (newLastReadTime: string) => {
             setUnreadMarkerTime(newLastReadTime);
             userActiveSince.current = DateUtils.getDBTime();
@@ -315,7 +325,7 @@ function ReportActionsList({
             unreadActionSubscription.remove();
             readNewestActionSubscription.remove();
         };
-    }, [report.reportID]);
+    }, [report.reportID, isAnonymousUser]);
 
     /**
      * When the user reads a new message as it is received, we'll push the unreadMarkerTime down to the timestamp of
@@ -324,7 +334,7 @@ function ReportActionsList({
      * lastReadTime.
      */
     useLayoutEffect(() => {
-        if (unreadMarkerReportActionID) {
+        if (isAnonymousUser || unreadMarkerReportActionID) {
             return;
         }