Do not block on user interactions in the background (#1726)

lib/app.dart

@@ -85,10 +85,10 @@ class _EnteAppState extends State<EnteApp> with WidgetsBindingObserver {
     if (Platform.isAndroid || kDebugMode) {
       _userInteractionTimer = Timer(timeout, () {
         debugPrint("user is not interacting with the app");
-        SemanticSearchService.instance.resumeIndexing();
+        SemanticSearchService.instance.startIndexing();
       });
     } else {
-      SemanticSearchService.instance.resumeIndexing();
+      SemanticSearchService.instance.startIndexing();
     }
   }
 

lib/main.dart

@@ -193,7 +193,7 @@ Future<void> _init(bool isBackground, {String via = ''}) async {
     });
   }
   unawaited(FeatureFlagService.instance.init());
-  unawaited(SemanticSearchService.instance.init());
+  unawaited(SemanticSearchService.instance.init(isInBackground: isBackground));
   // Can not including existing tf/ml binaries as they are not being built
   // from source.
   // See https://gitlab.com/fdroid/fdroiddata/-/merge_requests/12671#note_1294346819

lib/services/semantic_search/semantic_search_service.dart

@@ -54,8 +54,8 @@ class SemanticSearchService {
 
   get hasInitialized => _hasInitialized;
 
-  void resumeIndexing() {
-    _logger.info("Resuming indexing");
+  void startIndexing() {
+    _logger.info("Start indexing");
     _userInteraction.complete();
   }
 
@@ -66,7 +66,10 @@ class SemanticSearchService {
     }
   }
 
-  Future<void> init({bool shouldSyncImmediately = false}) async {
+  Future<void> init({
+    bool shouldSyncImmediately = false,
+    bool isInBackground = false,
+  }) async {
     if (!LocalSettings.instance.hasEnabledMagicSearch()) {
       return;
     }
@@ -111,6 +114,10 @@ class SemanticSearchService {
     if (shouldSyncImmediately) {
       unawaited(sync());
     }
+    if (isInBackground) {
+      // Do not block on user interactions
+      startIndexing();
+    }
   }
 
   Future<void> release() async {