Breadcrumbs should not be duplicated if there is no mechaism on Android

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Fixes
 
+* Breadcrumbs should not be duplicated if there is no mechanism on Android ([#936](https://github.com/getsentry/sentry-dart/pull/936))
 * Maps with Key Object, Object would fail during serialization if not String, Object ([#935](https://github.com/getsentry/sentry-dart/pull/935))
 
 ## 6.6.3

dart/lib/src/sentry_client.dart

@@ -378,12 +378,11 @@ class SentryClient {
   }
 
   SentryEvent _eventWithRemovedBreadcrumbsIfHandled(SentryEvent event) {
-    final exceptions = event.exceptions ?? [];
-    final handled = exceptions.isNotEmpty
-        ? exceptions.first.mechanism?.handled == true
-        : false;
+    final foundNotHandled = event.exceptions
+            ?.any((element) => element.mechanism?.handled == false) ??
+        false;
 
-    if (handled) {
+    if (!foundNotHandled) {
       return event.copyWith(breadcrumbs: []);
     } else {
       return event;

dart/test/sentry_client_test.dart

@@ -898,6 +898,28 @@ void main() {
       expect((capturedEvent.breadcrumbs ?? []).isEmpty, true);
     });
 
+    test('Clears breadcrumbs on Android if theres no mechanism', () async {
+      fixture.options.enableScopeSync = true;
+      fixture.options.platformChecker =
+          MockPlatformChecker(platform: MockPlatform.android());
+
+      final client = fixture.getSut();
+      final event = SentryEvent(exceptions: [
+        SentryException(
+          type: "type",
+          value: "value",
+        )
+      ], breadcrumbs: [
+        Breadcrumb()
+      ]);
+      await client.captureEvent(event);
+
+      final capturedEnvelope = (fixture.transport).envelopes.first;
+      final capturedEvent = await eventFromEnvelope(capturedEnvelope);
+
+      expect((capturedEvent.breadcrumbs ?? []).isEmpty, true);
+    });
+
     test('Does not clear breadcrumbs on Android if mechanism.handled is false',
         () async {
       fixture.options.enableScopeSync = true;