Fix chat doesn't scroll when splitting expense

src/libs/actions/IOU.ts

@@ -1001,6 +1001,7 @@ function buildOnyxDataForMoneyRequest(moneyRequestParams: BuildOnyxDataForMoneyR
             value: {
                 ...chat.report,
                 lastReadTime: DateUtils.getDBTime(),
+                ...(shouldCreateNewMoneyRequestReport ? {lastVisibleActionCreated: chat.reportPreviewAction.created} : {}),
                 iouReportID: iou.report.reportID,
                 ...outstandingChildRequest,
                 ...(isNewChatReport ? {pendingFields: {createChat: CONST.RED_BRICK_ROAD_PENDING_ACTION.ADD}} : {}),
@@ -1268,6 +1269,7 @@ function buildOnyxDataForMoneyRequest(moneyRequestParams: BuildOnyxDataForMoneyR
             value: {
                 iouReportID: chat.report?.iouReportID,
                 lastReadTime: chat.report?.lastReadTime,
+                lastVisibleActionCreated: chat.report?.lastVisibleActionCreated,
                 pendingFields: null,
                 hasOutstandingChildRequest: chat.report?.hasOutstandingChildRequest,
                 ...(isNewChatReport

src/pages/home/report/ReportActionsList.tsx

@@ -466,7 +466,7 @@ function ReportActionsList({
         (isFromCurrentUser: boolean) => {
             // If a new comment is added and it's from the current user scroll to the bottom otherwise leave the user positioned where
             // they are now in the list.
-            if (!isFromCurrentUser || scrollingVerticalOffset.current === 0 || !isReportScreenTopmostCentralPane()) {
+            if (!isFromCurrentUser || !isReportScreenTopmostCentralPane()) {
                 return;
             }
             if (!hasNewestReportActionRef.current) {
@@ -485,7 +485,7 @@ function ReportActionsList({
     );
 
     useEffect(() => {
-        if (!pendingBottomScroll || scrollingVerticalOffset.current === 0) {
+        if (!pendingBottomScroll) {
             return;
         }
 

tests/actions/IOUTest.ts

@@ -1738,6 +1738,49 @@ describe('actions/IOU', () => {
                         }),
                 );
         });
+
+        it('should update split chat report lastVisibleActionCreated to the report preview action', async () => {
+            // Given a workspace chat with no expenses
+            const workspaceReportID = '1';
+            await Onyx.merge(`${ONYXKEYS.COLLECTION.REPORT}${workspaceReportID}`, {reportID: workspaceReportID, isOwnPolicyExpenseChat: true});
+
+            // When the user split bill on the workspace
+            splitBill({
+                participants: [{reportID: workspaceReportID}],
+                currentUserLogin: RORY_EMAIL,
+                currentUserAccountID: RORY_ACCOUNT_ID,
+                comment: '',
+                amount: 100,
+                currency: CONST.CURRENCY.USD,
+                merchant: 'test',
+                created: '',
+                existingSplitChatReportID: workspaceReportID,
+            });
+
+            await waitForBatchedUpdates();
+
+            // Then the workspace chat lastVisibleActionCreated should be updated to the report preview action created
+            const reportPreviewAction = await new Promise<OnyxEntry<ReportAction>>((resolve) => {
+                const connection = Onyx.connect({
+                    key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${workspaceReportID}`,
+                    callback: (reportActions) => {
+                        Onyx.disconnect(connection);
+                        resolve(Object.values(reportActions ?? {}).find((action) => action.actionName === CONST.REPORT.ACTIONS.TYPE.REPORT_PREVIEW));
+                    },
+                });
+            });
+
+            await new Promise<OnyxEntry<Report>>((resolve) => {
+                const connection = Onyx.connect({
+                    key: `${ONYXKEYS.COLLECTION.REPORT}${workspaceReportID}`,
+                    callback: (report) => {
+                        Onyx.disconnect(connection);
+                        expect(report?.lastVisibleActionCreated).toBe(reportPreviewAction?.created);
+                        resolve(report);
+                    },
+                });
+            });
+        });
     });
 
     describe('payMoneyRequestElsewhere', () => {