Fix Hang on MacOS on close when synching

lib/main.dart

@@ -199,6 +199,11 @@ class OnWindow extends WindowListener {
     prefs.setDouble('width', s.width);
     prefs.setDouble('height', s.height);
   }
+
+  @override
+  void onWindowClose() async {
+    WarpApi.cancelSync();
+  }
 }
 
 void main() async {

native/zcash-sync

@@ -1 +1 @@
-Subproject commit 078af89cae4d5e8a229aabb2bfa934e73e257094
+Subproject commit 1a2dbc991fe877783aa7ef3c38ab323a0d220aa5

pubspec.yaml

@@ -15,7 +15,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 1.3.4+387
+version: 1.3.4+388
 
 environment:
   sdk: ">=2.12.0 <3.0.0"