Fix snackbar covering bottom appbar in viewer

app/lib/theme.dart

@@ -192,6 +192,7 @@ ThemeData _applyColorScheme(ColorScheme colorScheme, Color seedColor) {
         color: colorScheme.onInverseSurface,
       ),
       actionTextColor: colorScheme.inversePrimary,
+      behavior: SnackBarBehavior.floating,
     ),
     extensions: [
       M3(

app/lib/widget/viewer.dart

@@ -26,7 +26,6 @@ import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/use_case/inflate_file_descriptor.dart';
 import 'package:nc_photos/use_case/remove_from_album.dart';
 import 'package:nc_photos/use_case/update_property.dart';
-import 'package:nc_photos/widget/animated_visibility.dart';
 import 'package:nc_photos/widget/disposable.dart';
 import 'package:nc_photos/widget/handler/archive_selection_handler.dart';
 import 'package:nc_photos/widget/handler/remove_selection_handler.dart';
@@ -101,7 +100,7 @@ class Viewer extends StatefulWidget {
 class _ViewerState extends State<Viewer>
     with DisposableManagerMixin<Viewer>, ViewerControllersMixin<Viewer> {
   @override
-  initState() {
+  void initState() {
     super.initState();
     _streamFilesView = widget.streamFiles;
   }
@@ -112,6 +111,10 @@ class _ViewerState extends State<Viewer>
     return Theme(
       data: buildDarkTheme(),
       child: Scaffold(
+        extendBodyBehindAppBar: true,
+        extendBody: true,
+        appBar: _isShowAppBar ? _buildAppBar(context) : null,
+        bottomNavigationBar: _isShowAppBar ? _buildBottomAppBar(context) : null,
         body: Builder(
           builder: (context) => _buildContent(context, originalBrightness),
         ),
@@ -147,24 +150,7 @@ class _ViewerState extends State<Viewer>
               setState(() {});
             },
           ),
-          _buildBottomAppBar(context),
+          if (_isShowAppBar)
-          _buildAppBar(context),
-        ],
-      ),
-    );
-  }
-
-  Widget _buildAppBar(BuildContext context) {
-    final index =
-        _isViewerLoaded ? _viewerController.currentPage : widget.startIndex;
-    final file = _streamFilesView[index];
-    return Wrap(
-      children: [
-        AnimatedVisibility(
-          opacity: _isShowAppBar ? 1.0 : 0.0,
-          duration: k.animationDurationNormal,
-          child: Stack(
-            children: [
             Container(
               // + status bar height
               height: kToolbarHeight + MediaQuery.of(context).padding.top,
@@ -179,14 +165,21 @@ class _ViewerState extends State<Viewer>
                 ),
               ),
             ),
-              AppBar(
+        ],
+      ),
+    );
+  }
+
+  AppBar _buildAppBar(BuildContext context) {
+    final index =
+        _isViewerLoaded ? _viewerController.currentPage : widget.startIndex;
+    final file = _streamFilesView[index];
+    return AppBar(
       backgroundColor: Colors.transparent,
       elevation: 0,
       actions: [
         if (!_isDetailPaneActive && _canOpenDetailPane()) ...[
-                    (_pageStates[index]?.favoriteOverride ??
+          (_pageStates[index]?.favoriteOverride ?? file.fdIsFavorite) == true
-                                file.fdIsFavorite) ==
-                            true
               ? IconButton(
                   icon: const Icon(Icons.star),
                   tooltip: L10n.global().unfavoriteTooltip,
@@ -204,11 +197,6 @@ class _ViewerState extends State<Viewer>
           ),
         ],
       ],
-              ),
-            ],
-          ),
-        ),
-      ],
     );
   }
 
@@ -216,16 +204,7 @@ class _ViewerState extends State<Viewer>
     final index =
         _isViewerLoaded ? _viewerController.currentPage : widget.startIndex;
     final file = _streamFilesView[index];
-    return Align(
+    return ViewerBottomAppBar(
-      alignment: Alignment.bottomCenter,
-      child: Material(
-        type: MaterialType.transparency,
-        child: AnimatedVisibility(
-          opacity: (_isShowAppBar && !_isDetailPaneActive) ? 1.0 : 0.0,
-          duration: !_isDetailPaneActive
-              ? k.animationDurationNormal
-              : const Duration(milliseconds: 1),
-          child: ViewerBottomAppBar(
       children: [
         IconButton(
           icon: const Icon(Icons.share_outlined),
@@ -256,9 +235,6 @@ class _ViewerState extends State<Viewer>
           onPressed: () => _onDeletePressed(context),
         ),
       ],
-          ),
-        ),
-      ),
     );
   }