Chat - New marker displayed briefly when chat is opened

[lanitochka17]

If you haven’t already, check out our contributing guidelines for onboarding and email contributors@expensify.com to request to join our Slack channel!

---

Issue found when executing PR #18637

Action Performed:

1. Log in as user B on the main device and as user A on another device
2. Open the chat between users B and A on the main device
3. Send the message as user A to user B from the secondary device

Expected Result:

The marker "New" is not displayed for both users

Actual Result:

The marker "New" is displayed briefly for user B on the main device (android)

Workaround:

Unknown

Platforms:

Which of our officially supported platforms is this issue occurring on?

• Android / native
• Android / Chrome
• iOS / native
• iOS / Safari
• MacOS / Chrome / Safari
• MacOS / Desktop

Version Number: 1.3.56-2

Reproducible in staging?: Yes

Reproducible in production?: No

If this was caught during regression testing, add the test name, ID and link from TestRail:

Email or phone of affected tester (no customers):

Logs: https://stackoverflow.com/c/expensify/questions/4856

Notes/Photos/Videos: Any additional supporting documentation

Bug6173006_Video_2023-08-22_00-46-02-1.mp4

Expensify/Expensify Issue URL:

Issue reported by: Applause - Internal Team

Slack conversation:

View all open jobs on GitHub

[OSBotify]

👋 Friendly reminder that deploy blockers are time-sensitive ⏱ issues! Check out the open StagingDeployCash deploy checklist to see the list of PRs included in this release, then work quickly to do one of the following:

1. Identify the pull request that introduced this issue and revert it.
2. Find someone who can quickly fix the issue.
3. Fix the issue yourself.

[melvin-bot]

Triggered auto assignment to @srikarparsi (Engineering), see https://stackoverflow.com/c/expensify/questions/4319 for more details.

[dukenv0307]

Proposal

Please re-state the problem that we are trying to solve in this issue.

Chat - New marker displayed briefly when chat is opened

What is the root cause of that problem?

When user A received a message, this useEffect is triggered because the length of sortedReportActions is changed.
Here we always call readNewestAction API if the report is unread without checking the last action is created by current user or not

App/src/pages/home/report/ReportActionsList.js

Lines 147 to 152 in 2dbfb4b

	if (ReportUtils.isUnread(report)) {
	if (scrollingVerticalOffset.current < MSG_VISIBLE_THRESHOLD) {
	Report.readNewestAction(report.reportID);
	} else {
	readActionSkipped.current = true;
	}

What changes do you think we should make in order to solve the problem?

We should check if the last action is not created by current user, we will not call readNewestAction API

App/src/pages/home/report/ReportActionsList.js

Lines 147 to 152 in 2dbfb4b

	if (ReportUtils.isUnread(report)) {
	if (scrollingVerticalOffset.current < MSG_VISIBLE_THRESHOLD) {
	Report.readNewestAction(report.reportID);
	} else {
	readActionSkipped.current = true;
	}

What alternative solutions did you explore? (Optional)

[srikarparsi]

Hi @MonilBhavsar and @allroundexperts, do you think you could take a look at this deploy blocker. It seems to have been caused by this PR here.