Fix duplicate migrated user modal

Author: fabioh8010

src/hooks/useOnboardingFlow.ts

@@ -2,12 +2,13 @@ import {useEffect, useRef} from 'react';
 import {InteractionManager} from 'react-native';
 import {startOnboardingFlow} from '@libs/actions/Welcome/OnboardingFlow';
 import getCurrentUrl from '@libs/Navigation/currentUrl';
-import Navigation from '@libs/Navigation/Navigation';
+import Navigation, {navigationRef} from '@libs/Navigation/Navigation';
 import {hasCompletedGuidedSetupFlowSelector, tryNewDotOnyxSelector} from '@libs/onboardingSelectors';
 import {buildCannedSearchQuery} from '@libs/SearchQueryUtils';
 import {isLoggingInAsNewUser} from '@libs/SessionUtils';
 import isProductTrainingElementDismissed from '@libs/TooltipUtils';
 import CONFIG from '@src/CONFIG';
+import NAVIGATORS from '@src/NAVIGATORS';
 import ONYXKEYS from '@src/ONYXKEYS';
 import ROUTES from '@src/ROUTES';
 import isLoadingOnyxValue from '@src/types/utils/isLoadingOnyxValue';
@@ -61,11 +62,17 @@ function useOnboardingFlowRouter() {
             if (CONFIG.IS_HYBRID_APP && isLoadingOnyxValue(isSingleNewDotEntryMetadata)) {
                 return;
             }
+
             if (hasBeenAddedToNudgeMigration && !isProductTrainingElementDismissed('migratedUserWelcomeModal', dismissedProductTraining)) {
-                const defaultCannedQuery = buildCannedSearchQuery();
-                const query = defaultCannedQuery;
-                Navigation.navigate(ROUTES.SEARCH_ROOT.getRoute({query}));
-                Navigation.navigate(ROUTES.MIGRATED_USER_WELCOME_MODAL.getRoute(true));
+                const navigationState = navigationRef.getRootState();
+                const lastRoute = navigationState.routes.at(-1);
+                // Prevent duplicate navigation if the migrated user modal is already shown.
+                if (lastRoute?.name !== NAVIGATORS.MIGRATED_USER_MODAL_NAVIGATOR) {
+                    const defaultCannedQuery = buildCannedSearchQuery();
+                    const query = defaultCannedQuery;
+                    Navigation.navigate(ROUTES.SEARCH_ROOT.getRoute({query}));
+                    Navigation.navigate(ROUTES.MIGRATED_USER_WELCOME_MODAL.getRoute(true));
+                }
                 return;
             }