fix(metadata): clarify online autofill controls

test/mornye_library_actions_test.dart

@@ -20,6 +20,7 @@ import 'package:spotiflac_android/widgets/app_alert_dialog.dart';
 import 'package:spotiflac_android/widgets/app_switch.dart';
 import 'package:spotiflac_android/widgets/batch_convert_sheet.dart';
 import 'package:spotiflac_android/widgets/mornye_context_menu.dart';
+import 'package:spotiflac_android/widgets/mornye_chrome.dart';
 import 'package:spotiflac_android/widgets/re_enrich_field_dialog.dart';
 import 'package:spotiflac_android/widgets/selection_action_button.dart';
 import 'package:spotiflac_android/widgets/selection_bottom_bar.dart';
@@ -339,6 +340,28 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.text('Edited track'), findsOneWidget);
     expect(find.widgetWithText(AppActionButton, 'Save'), findsOneWidget);
+    await tester.scrollUntilVisible(
+      find.text('Auto-fill from online'),
+      -250,
+      scrollable: find
+          .descendant(
+            of: find.byType(ListView).last,
+            matching: find.byType(Scrollable),
+          )
+          .first,
+    );
+    await _tapVisible(tester, find.text('Auto-fill from online'));
+    await _tapVisible(tester, find.text('None'));
+    final search = find.widgetWithText(AppActionButton, 'Find metadata');
+    expect(tester.widget<AppActionButton>(search).onPressed, isNull);
+    await _tapVisible(tester, find.text('All'));
+    expect(tester.widget<AppActionButton>(search).onPressed, isNotNull);
+    expect(
+      tester
+          .widgetList<MornyeFilterChip>(find.byType(MornyeFilterChip))
+          .every((chip) => chip.selected),
+      isTrue,
+    );
     expect(tester.takeException(), isNull);
   });
 }