Chat loader flickering

src/libs/ReportActionsUtils.ts

@@ -155,14 +155,14 @@ function isTransactionThread(parentReportAction: OnyxEntry<ReportAction>): boole
  * This gives us a stable order even in the case of multiple reportActions created on the same millisecond
  *
  */
-function getSortedReportActions(reportActions: ReportAction[] | null, shouldSortInDescendingOrder = false): ReportAction[] {
+function getSortedReportActions(reportActions: ReportAction[] | null, shouldSortInDescendingOrder = false, shouldMarkTheFirstItemAsNewest = false): ReportAction[] {
     if (!Array.isArray(reportActions)) {
         throw new Error(`ReportActionsUtils.getSortedReportActions requires an array, received ${typeof reportActions}`);
     }
 
     const invertedMultiplier = shouldSortInDescendingOrder ? -1 : 1;
 
-    return reportActions?.filter(Boolean).sort((first, second) => {
+    const sortedActions = reportActions?.filter(Boolean).sort((first, second) => {
         // First sort by timestamp
         if (first.created !== second.created) {
             return (first.created < second.created ? -1 : 1) * invertedMultiplier;
@@ -182,6 +182,16 @@ function getSortedReportActions(reportActions: ReportAction[] | null, shouldSort
         // will be consistent across all users and devices
         return (first.reportActionID < second.reportActionID ? -1 : 1) * invertedMultiplier;
     });
+
+    // If shouldMarkTheFirstItemAsNewest is true, label the first reportAction as isNewestReportAction
+    if (shouldMarkTheFirstItemAsNewest && sortedActions?.length > 0) {
+        sortedActions[0] = {
+            ...sortedActions[0],
+            isNewestReportAction: true,
+        };
+    }
+
+    return sortedActions;
 }
 
 /**
@@ -443,12 +453,12 @@ function filterOutDeprecatedReportActions(reportActions: ReportActions | null):
  * to ensure they will always be displayed in the same order (in case multiple actions have the same timestamp).
  * This is all handled with getSortedReportActions() which is used by several other methods to keep the code DRY.
  */
-function getSortedReportActionsForDisplay(reportActions: ReportActions | null): ReportAction[] {
+function getSortedReportActionsForDisplay(reportActions: ReportActions | null, shouldMarkTheFirstItemAsNewest = false): ReportAction[] {
     const filteredReportActions = Object.entries(reportActions ?? {})
         .filter(([key, reportAction]) => shouldReportActionBeVisible(reportAction, key))
         .map((entry) => entry[1]);
     const baseURLAdjustedReportActions = filteredReportActions.map((reportAction) => replaceBaseURL(reportAction));
-    return getSortedReportActions(baseURLAdjustedReportActions, true);
+    return getSortedReportActions(baseURLAdjustedReportActions, true, shouldMarkTheFirstItemAsNewest);
 }
 
 /**

src/pages/home/ReportScreen.js

@@ -474,7 +474,7 @@ export default compose(
             reportActions: {
                 key: ({route}) => `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${getReportID(route)}`,
                 canEvict: false,
-                selector: ReportActionsUtils.getSortedReportActionsForDisplay,
+                selector: (reportActions) => ReportActionsUtils.getSortedReportActionsForDisplay(reportActions, true),
             },
             report: {
                 key: ({route}) => `${ONYXKEYS.COLLECTION.REPORT}${getReportID(route)}`,

src/pages/home/report/ReportActionsView.js

@@ -96,6 +96,7 @@ function ReportActionsView(props) {
 
     const isFocused = useIsFocused();
     const reportID = props.report.reportID;
+    const hasNewestReportAction = lodashGet(props.reportActions[0], 'isNewestReportAction');
 
     /**
      * @returns {Boolean}
@@ -199,7 +200,7 @@ function ReportActionsView(props) {
     const loadNewerChats = useMemo(
         () =>
             _.throttle(({distanceFromStart}) => {
-                if (props.isLoadingNewerReportActions || props.isLoadingInitialReportActions) {
+                if (props.isLoadingNewerReportActions || props.isLoadingInitialReportActions || hasNewestReportAction) {
                     return;
                 }
 
@@ -221,7 +222,7 @@ function ReportActionsView(props) {
                 const newestReportAction = _.first(props.reportActions);
                 Report.getNewerActions(reportID, newestReportAction.reportActionID);
             }, 500),
-        [props.isLoadingNewerReportActions, props.isLoadingInitialReportActions, props.reportActions, reportID],
+        [props.isLoadingNewerReportActions, props.isLoadingInitialReportActions, props.reportActions, reportID, hasNewestReportAction],
     );
 
     /**

src/types/onyx/ReportAction.ts

@@ -138,6 +138,9 @@ type ReportActionBase = {
     isAttachment?: boolean;
     childRecentReceiptTransactionIDs?: Record<string, string>;
     reportID?: string;
+
+    /** We manually add this field while sorting to detect the end of the list */
+    isNewestReportAction?: boolean;
 };
 
 type ReportAction = ReportActionBase & OriginalMessage;

tests/unit/ReportActionsUtilsTest.js

@@ -185,10 +185,71 @@ describe('ReportActionsUtils', () => {
                     message: [{html: 'I have changed the task'}],
                 },
             ];
+
             const result = ReportActionsUtils.getSortedReportActionsForDisplay(input);
             input.pop();
             expect(result).toStrictEqual(input);
         });
+
+        describe('getSortedReportActionsForDisplay with marked the first reportAction', () => {
+            it('should filter out non-whitelisted actions', () => {
+                const input = [
+                    {
+                        created: '2022-11-13 22:27:01.825',
+                        reportActionID: '8401445780099176',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.ADDCOMMENT,
+                        message: [{html: 'Hello world'}],
+                    },
+                    {
+                        created: '2022-11-12 22:27:01.825',
+                        reportActionID: '6401435781022176',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.CREATED,
+                        message: [{html: 'Hello world'}],
+                    },
+                    {
+                        created: '2022-11-11 22:27:01.825',
+                        reportActionID: '2962390724708756',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.IOU,
+                        message: [{html: 'Hello world'}],
+                    },
+                    {
+                        created: '2022-11-10 22:27:01.825',
+                        reportActionID: '1609646094152486',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.RENAMED,
+                        message: [{html: 'Hello world'}],
+                    },
+                    {
+                        created: '2022-11-09 22:27:01.825',
+                        reportActionID: '8049485084562457',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.POLICYCHANGELOG.UPDATE_FIELD,
+                        message: [{html: 'updated the Approval Mode from "Submit and Approve" to "Submit and Close"'}],
+                    },
+                    {
+                        created: '2022-11-08 22:27:06.825',
+                        reportActionID: '1661970171066216',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.REIMBURSEMENTQUEUED,
+                        message: [{html: 'Waiting for the bank account'}],
+                    },
+                    {
+                        created: '2022-11-06 22:27:08.825',
+                        reportActionID: '1661970171066220',
+                        actionName: CONST.REPORT.ACTIONS.TYPE.TASKEDITED,
+                        message: [{html: 'I have changed the task'}],
+                    },
+                ];
+
+                const resultWithoutNewestFlag = ReportActionsUtils.getSortedReportActionsForDisplay(input);
+                const resultWithNewestFlag = ReportActionsUtils.getSortedReportActionsForDisplay(input, true);
+                input.pop();
+                // Mark the newest report action as the newest report action
+                resultWithoutNewestFlag[0] = {
+                    ...resultWithoutNewestFlag[0],
+                    isNewestReportAction: true,
+                };
+                expect(resultWithoutNewestFlag).toStrictEqual(resultWithNewestFlag);
+            });
+        });
+
         it('should filter out closed actions', () => {
             const input = [
                 {