Merge pull request Expensify#32958 from dukenv0307/fix/31748

Mark the latest report action from other users as unread

src/libs/actions/Report.ts

@@ -938,8 +938,18 @@ function readNewestAction(reportID: string) {
  * Sets the last read time on a report
  */
 function markCommentAsUnread(reportID: string, reportActionCreated: string) {
-    // If no action created date is provided, use the last action's
-    const actionCreationTime = reportActionCreated || (allReports?.[reportID]?.lastVisibleActionCreated ?? DateUtils.getDBTime(0));
+    const reportActions = allReportActions?.[reportID];
+
+    // Find the latest report actions from other users
+    const latestReportActionFromOtherUsers = Object.values(reportActions ?? {}).reduce((latest: ReportAction | null, current: ReportAction) => {
+        if (current.actorAccountID !== currentUserAccountID && (!latest || current.created > latest.created)) {
+            return current;
+        }
+        return latest;
+    }, null);
+
+    // If no action created date is provided, use the last action's from other user
+    const actionCreationTime = reportActionCreated || (latestReportActionFromOtherUsers?.created ?? DateUtils.getDBTime(0));
 
     // We subtract 1 millisecond so that the lastReadTime is updated to just before a given reportAction's created date
     // For example, if we want to mark a report action with ID 100 and created date '2014-04-01 16:07:02.999' unread, we set the lastReadTime to '2014-04-01 16:07:02.998'