Fix chat doesn't scroll when split bill in dm

src/libs/actions/IOU.ts

@@ -122,6 +122,7 @@ import {
     isInvoiceReport as isInvoiceReportReportUtils,
     isInvoiceRoom,
     isMoneyRequestReport as isMoneyRequestReportReportUtils,
+    isOneOnOneChat,
     isOpenExpenseReport as isOpenExpenseReportReportUtils,
     isOpenInvoiceReport as isOpenInvoiceReportReportUtils,
     isOptimisticPersonalDetail,
@@ -5280,7 +5281,7 @@ function createSplitsAndOnyxData(
         // or, if the split is being made from the workspace chat, then the oneOnOneChatReport is the same as the splitChatReport
         // in this case existingSplitChatReport will belong to the policy expense chat and we won't be
         // entering code that creates optimistic personal details
-        if ((!hasMultipleParticipants && !existingSplitChatReportID) || isOwnPolicyExpenseChat) {
+        if ((!hasMultipleParticipants && !existingSplitChatReportID) || isOwnPolicyExpenseChat || isOneOnOneChat(splitChatReport)) {
             oneOnOneChatReport = splitChatReport;
             shouldCreateOptimisticPersonalDetails = !existingSplitChatReport && !personalDetailExists;
         } else {

tests/actions/IOUTest.ts

@@ -1774,6 +1774,67 @@ describe('actions/IOU', () => {
                 });
             });
         });
+
+        it('should update split chat report lastVisibleActionCreated to the latest IOU action when split bill in a DM', async () => {
+            // Given a DM chat with no expenses
+            const reportID = '1';
+            await Onyx.merge(`${ONYXKEYS.COLLECTION.REPORT}${reportID}`, {
+                reportID,
+                type: CONST.REPORT.TYPE.CHAT,
+                participants: {[RORY_ACCOUNT_ID]: RORY_PARTICIPANT, [CARLOS_ACCOUNT_ID]: CARLOS_PARTICIPANT},
+            });
+
+            // When the user split bill twice on the DM
+            splitBill({
+                participants: [{accountID: CARLOS_ACCOUNT_ID, login: CARLOS_EMAIL}],
+                currentUserLogin: RORY_EMAIL,
+                currentUserAccountID: RORY_ACCOUNT_ID,
+                comment: '',
+                amount: 100,
+                currency: CONST.CURRENCY.USD,
+                merchant: 'test',
+                created: '',
+                existingSplitChatReportID: reportID,
+            });
+
+            await waitForBatchedUpdates();
+
+            splitBill({
+                participants: [{accountID: CARLOS_ACCOUNT_ID, login: CARLOS_EMAIL}],
+                currentUserLogin: RORY_EMAIL,
+                currentUserAccountID: RORY_ACCOUNT_ID,
+                comment: '',
+                amount: 200,
+                currency: CONST.CURRENCY.USD,
+                merchant: 'test',
+                created: '',
+                existingSplitChatReportID: reportID,
+            });
+
+            await waitForBatchedUpdates();
+
+            // Then the DM lastVisibleActionCreated should be updated to the second IOU action created
+            const iouAction = await new Promise<OnyxEntry<ReportAction>>((resolve) => {
+                const connection = Onyx.connect({
+                    key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${reportID}`,
+                    callback: (reportActions) => {
+                        Onyx.disconnect(connection);
+                        resolve(Object.values(reportActions ?? {}).find((action) => isActionOfType(action, CONST.REPORT.ACTIONS.TYPE.IOU) && getOriginalMessage(action)?.amount === 200));
+                    },
+                });
+            });
+
+            const report = await new Promise<OnyxEntry<Report>>((resolve) => {
+                const connection = Onyx.connect({
+                    key: `${ONYXKEYS.COLLECTION.REPORT}${reportID}`,
+                    callback: (reportVal) => {
+                        Onyx.disconnect(connection);
+                        resolve(reportVal);
+                    },
+                });
+            });
+            expect(report?.lastVisibleActionCreated).toBe(iouAction?.created);
+        });
     });
 
     describe('payMoneyRequestElsewhere', () => {