fixed pending share race error on warm app start

lib/api/errors/error_mapper.dart

@@ -23,6 +23,7 @@ AppException? _dioToAppException(DioException error) {
     case DioExceptionType.connectionTimeout:
     case DioExceptionType.sendTimeout:
     case DioExceptionType.receiveTimeout:
+    case DioExceptionType.transformTimeout:
       return NetworkException.timeout(technicalDetails: error.message);
     case DioExceptionType.connectionError:
       return NetworkException(technicalDetails: error.message);

lib/api/marianumconnect/errors/marianumconnect_error.dart

@@ -14,6 +14,7 @@ AppException mapMarianumConnectError(DioException error) {
     case DioExceptionType.connectionTimeout:
     case DioExceptionType.sendTimeout:
     case DioExceptionType.receiveTimeout:
+    case DioExceptionType.transformTimeout:
       return NetworkException.timeout(technicalDetails: error.message);
     case DioExceptionType.connectionError:
       return NetworkException(technicalDetails: error.message);

lib/share_intent/pending_share.dart

@@ -12,4 +12,17 @@ class PendingShare {
   bool get hasFiles => filePaths.isNotEmpty;
   bool get hasText => text != null && text!.isNotEmpty;
   bool get isEmpty => !hasFiles && !hasText;
+
+  /// True when [other] carries the same payload. The iOS Share Extension
+  /// fires two `open(url)` requests per share (see ShareViewController), so
+  /// the same share can arrive twice on the media stream — receivedAt is
+  /// deliberately ignored here so such duplicates compare equal.
+  bool contentEquals(PendingShare other) {
+    if (text != other.text) return false;
+    if (filePaths.length != other.filePaths.length) return false;
+    for (var i = 0; i < filePaths.length; i++) {
+      if (filePaths[i] != other.filePaths[i]) return false;
+    }
+    return true;
+  }
 }

lib/share_intent/share_intent_listener.dart

@@ -25,7 +25,7 @@ class ShareIntentListener {
     try {
       final initial = await ReceiveSharingIntent.instance.getInitialMedia();
       final share = _toPendingShare(initial);
-      if (share != null) pending.value = share;
+      if (share != null) _publish(share);
       await ReceiveSharingIntent.instance.reset();
     } catch (e) {
       debugPrint('ShareIntentListener.initialize failed: $e');
@@ -37,13 +37,24 @@ class ShareIntentListener {
     _streamSub ??= ReceiveSharingIntent.instance.getMediaStream().listen(
       (items) {
         final share = _toPendingShare(items);
-        if (share != null) pending.value = share;
+        if (share != null) _publish(share);
       },
       onError: (Object e) =>
           debugPrint('ShareIntentListener stream error: $e'),
     );
   }
 
+  /// The iOS Share Extension fires two `open(url)` requests per share, so the
+  /// same payload can arrive twice in quick succession. Publishing the
+  /// duplicate would re-trigger the share-flow navigation, pop the already
+  /// open ShareTargetPage and thereby delete the temp files of the share that
+  /// is still in flight — swallow it instead.
+  void _publish(PendingShare share) {
+    final current = pending.value;
+    if (current != null && current.contentEquals(share)) return;
+    pending.value = share;
+  }
+
   /// Cancels the warm-share subscription. The singleton survives, so a
   /// subsequent [attach] re-subscribes.
   void detach() {
@@ -53,8 +64,15 @@ class ShareIntentListener {
 
   /// Discards the current share and removes any temp files the plugin copied
   /// into the app cache. Idempotent.
-  void clear() {
+  ///
+  /// Pass [ifCurrent] from UI that owns a specific share (e.g. the
+  /// ShareTargetPage pop handler): the call then only acts while that share
+  /// is still the pending one. Without the guard, popping a stale share page
+  /// after a new share arrived would delete the new share's temp files before
+  /// its upload ran.
+  void clear({PendingShare? ifCurrent}) {
     final current = pending.value;
+    if (ifCurrent != null && !identical(current, ifCurrent)) return;
     pending.value = null;
     if (current != null) {
       for (final path in current.filePaths) {

lib/view/pages/files/files_upload_dialog.dart

@@ -187,11 +187,23 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
             '${_uploadableFiles.indexOf(file) + 1}/${_uploadableFiles.length}';
       });
 
+      // A vanished source file would otherwise surface as a cryptic
+      // "Content-Length must contain only digits" HttpException, because
+      // statSync reports size -1 for missing files.
+      final fileStat = FileStat.statSync(filePath);
+      if (fileStat.type == FileSystemEntityType.notFound || fileStat.size < 0) {
+        _showUploadError(
+          'Die Datei "$fileName" ist nicht mehr verfügbar. '
+          'Bitte wähle sie erneut aus.',
+        );
+        return;
+      }
+
       final HttpClientResponse uploadTask;
       try {
         uploadTask = await webdavClient.putFile(
           File(filePath),
-          FileStat.statSync(filePath),
+          fileStat,
           PathUri.parse(fullRemotePath),
           onProgress: (progress) {
             setState(() {

lib/view/pages/share_intent/share_chat_picker.dart

@@ -197,7 +197,7 @@ void _setExternalDraftAndOpenChat(
     final settings = context.read<SettingsCubit>();
     settings.val(write: true).talkSettings.drafts[room.token] = share.text!;
   }
-  ShareIntentListener.instance.clear();
+  ShareIntentListener.instance.clear(ifCurrent: share);
   _finishWithChat(context, room);
 }
 

lib/view/pages/share_intent/share_folder_picker.dart

@@ -212,13 +212,18 @@ Future<void> _externalUploadFlow(
     screen: FilesUploadDialog(
       filePaths: share.filePaths,
       remotePath: targetPath.join('/'),
-      onUploadFinished: (_) => _afterExternalUploaded(context, targetPath),
+      onUploadFinished: (_) =>
+          _afterExternalUploaded(context, targetPath, share),
     ),
   );
 }
 
-void _afterExternalUploaded(BuildContext context, List<String> targetPath) {
-  ShareIntentListener.instance.clear();
+void _afterExternalUploaded(
+  BuildContext context,
+  List<String> targetPath,
+  PendingShare share,
+) {
+  ShareIntentListener.instance.clear(ifCurrent: share);
   if (!context.mounted) return;
   _finishWithFolder(context, targetPath);
 }

lib/view/pages/share_intent/share_target_page.dart

@@ -40,7 +40,7 @@ class ShareTargetPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) => PopScope(
     onPopInvokedWithResult: (didPop, _) {
-      if (didPop) ShareIntentListener.instance.clear();
+      if (didPop) ShareIntentListener.instance.clear(ifCurrent: share);
     },
     child: Scaffold(
       appBar: AppBar(title: Text(_appBarTitle())),

test/share_intent/pending_share_test.dart

@@ -0,0 +1,66 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/share_intent/pending_share.dart';
+
+PendingShare _share({
+  List<String> filePaths = const [],
+  String? text,
+  DateTime? receivedAt,
+}) => PendingShare(
+  filePaths: filePaths,
+  text: text,
+  receivedAt: receivedAt ?? DateTime(2026, 1, 1),
+);
+
+void main() {
+  group('PendingShare.contentEquals', () {
+    test('equal payloads compare equal regardless of receivedAt', () {
+      final a = _share(
+        filePaths: ['/tmp/a.jpg', '/tmp/b.jpg'],
+        text: 'hi',
+        receivedAt: DateTime(2026, 1, 1),
+      );
+      final b = _share(
+        filePaths: ['/tmp/a.jpg', '/tmp/b.jpg'],
+        text: 'hi',
+        receivedAt: DateTime(2026, 1, 1, 0, 0, 1),
+      );
+
+      expect(a.contentEquals(b), isTrue);
+      expect(b.contentEquals(a), isTrue);
+    });
+
+    test('differing text is not equal', () {
+      final a = _share(filePaths: ['/tmp/a.jpg'], text: 'hi');
+      final b = _share(filePaths: ['/tmp/a.jpg'], text: 'ho');
+
+      expect(a.contentEquals(b), isFalse);
+    });
+
+    test('null text vs text is not equal', () {
+      final a = _share(filePaths: ['/tmp/a.jpg']);
+      final b = _share(filePaths: ['/tmp/a.jpg'], text: 'hi');
+
+      expect(a.contentEquals(b), isFalse);
+    });
+
+    test('differing file lists are not equal', () {
+      final a = _share(filePaths: ['/tmp/a.jpg']);
+      final b = _share(filePaths: ['/tmp/b.jpg']);
+      final c = _share(filePaths: ['/tmp/a.jpg', '/tmp/b.jpg']);
+
+      expect(a.contentEquals(b), isFalse);
+      expect(a.contentEquals(c), isFalse);
+    });
+
+    test('file order matters', () {
+      final a = _share(filePaths: ['/tmp/a.jpg', '/tmp/b.jpg']);
+      final b = _share(filePaths: ['/tmp/b.jpg', '/tmp/a.jpg']);
+
+      expect(a.contentEquals(b), isFalse);
+    });
+
+    test('empty shares compare equal', () {
+      expect(_share().contentEquals(_share()), isTrue);
+    });
+  });
+}