neon_files: Go up a folder when going back

packages/neon/neon_files/lib/widgets/browser_view.dart

@@ -46,7 +46,16 @@ class _FilesBrowserViewState extends State<FilesBrowserView> {
                       !uploadTasksSnapshot.hasData ||
                       !downloadTasksSnapshot.hasData
                   ? Container()
-                  : Scaffold(
+                  : BackButtonListener(
+                      onBackButtonPressed: () async {
+                        final path = pathSnapshot.data!;
+                        if (path.isNotEmpty) {
+                          widget.bloc.setPath(path.sublist(0, path.length - 1));
+                          return true;
+                        }
+                        return false;
+                      },
+                      child: Scaffold(
                         resizeToAvoidBottomInset: false,
                         floatingActionButton: widget.enableCreateActions
                             ? FloatingActionButton(
@@ -69,8 +78,9 @@ class _FilesBrowserViewState extends State<FilesBrowserView> {
                             for (final uploadTask in files.data == null
                                 ? <UploadTask>[]
                                 : uploadTasksSnapshot.data!.where(
-                                  (final task) =>
+                                    (final task) => files.data!
-                                      files.data!.where((final file) => _pathMatchesFile(task.path, file.name)).isEmpty,
+                                        .where((final file) => _pathMatchesFile(task.path, file.name))
+                                        .isEmpty,
                                   )) ...[
                               StreamBuilder<int>(
                                 stream: uploadTask.progress,
@@ -108,7 +118,8 @@ class _FilesBrowserViewState extends State<FilesBrowserView> {
                                         stream: matchingUploadTasks.isNotEmpty
                                             ? matchingUploadTasks.first.progress
                                             : Stream.value(null),
-                                      builder: (final context, final uploadTaskProgressSnapshot) => StreamBuilder<int?>(
+                                        builder: (final context, final uploadTaskProgressSnapshot) =>
+                                            StreamBuilder<int?>(
                                           stream: matchingDownloadTasks.isNotEmpty
                                               ? matchingDownloadTasks.first.progress
                                               : Stream.value(null),
@@ -187,6 +198,7 @@ class _FilesBrowserViewState extends State<FilesBrowserView> {
                     ),
             ),
           ),
+        ),
       );
 
   bool _pathMatchesFile(final List<String> path, final String name) => const ListEquality().equals(