test: improved driver test + shaders

lib/widgets/collection/collection_grid.dart

@@ -38,8 +38,9 @@ class CollectionGrid extends StatefulWidget {
   final String? settingsRouteKey;
 
   const CollectionGrid({
+    Key? key,
     this.settingsRouteKey,
-  });
+  }) : super(key: key);
 
   @override
   _CollectionGridState createState() => _CollectionGridState();

lib/widgets/collection/collection_page.dart

@@ -46,7 +46,9 @@ class _CollectionPageState extends State<CollectionPage> {
                 bottom: false,
                 child: ChangeNotifierProvider<CollectionLens>.value(
                   value: collection,
-                  child: CollectionGrid(),
+                  child: CollectionGrid(
+                    key: Key('collection-grid'),
+                  ),
                 ),
               ),
             ),

lib/widgets/common/scaling.dart

@@ -284,7 +284,6 @@ class GridPainter extends CustomPainter {
         ],
       );
 
-    // final topLeft = center.translate(-extent / 2, -extent / 2);
     final delta = extent + spacing;
     for (var i = -2; i <= 2; i++) {
       final dx = delta * i;

lib/widgets/filter_grids/common/filter_nav_page.dart

@@ -53,7 +53,7 @@ class FilterNavigationPage<T extends CollectionFilter> extends StatelessWidget {
   Widget build(BuildContext context) {
     final isMainMode = context.select<ValueNotifier<AppMode>, bool>((vn) => vn.value == AppMode.main);
     return FilterGridPage<T>(
-      key: ValueKey('filter-grid-page'),
+      key: Key('filter-grid-page'),
       appBar: SliverAppBar(
         title: InteractiveAppBarTitle(
           onTap: () => _goToSearch(context),

test_driver/app.dart

@@ -16,7 +16,9 @@ void main() {
   // scan files copied from test assets
   // we do it via the app instead of broadcasting via ADB
   // because `MEDIA_SCANNER_SCAN_FILE` intent got deprecated in API 29
-  PlatformStorageService().scanFile(p.join(targetPicturesDir, 'ipse.jpg'), 'image/jpeg');
+  final storageService = PlatformStorageService();
+  storageService.scanFile(p.join(targetPicturesDir, 'aves_logo.svg'), 'image/svg+xml');
+  storageService.scanFile(p.join(targetPicturesDir, 'ipse.jpg'), 'image/jpeg');
 
   configureAndLaunch();
 }

test_driver/app_test.dart

@@ -37,6 +37,7 @@ void main() {
     selectFirstAlbum();
     searchAlbum();
     showViewer();
+    goToNextImage();
     toggleOverlay();
     zoom();
     showInfoMetadata();
@@ -154,12 +155,24 @@ void searchAlbum() {
 
 void showViewer() {
   test('[collection] show viewer', () async {
-    await driver.tap(find.byType('DecoratedThumbnail'));
+    await driver.tap(find.descendant(
+      of: find.byValueKey('collection-grid'),
+      matching: find.byType('DecoratedThumbnail'),
+      firstMatchOnly: true,
+    ));
     await driver.waitUntilNoTransientCallbacks();
     await Future.delayed(Duration(seconds: 2));
   });
 }
 
+void goToNextImage() {
+  test('[viewer] show next image', () async {
+    final horizontalPageView = find.byValueKey('horizontal-pageview');
+    await driver.scroll(horizontalPageView, -600, 0, Duration(milliseconds: 400));
+    await Future.delayed(Duration(seconds: 2));
+  });
+}
+
 void toggleOverlay() {
   test('[viewer] toggle overlay', () async {
     final imageView = find.byValueKey('imageview');

test_driver/assets/aves_logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="265.554" height="244.35"><path d="M0 10.84L166.56 177.4l43.778-43.775L87.553 10.84z" fill="#3f51b5"/><path d="M99.61 132.726V244.35l55.812-55.812z" fill="#4caf50"/><path d="M210.337 111.624V0l-55.812 55.812z" fill="#ffc107"/><path d="M265.554 39.465L226.089 0v39.465z" fill="#ff5722"/></svg>