fix analysis (#47594)

examples/flutter_gallery/lib/gallery/scales.dart

@@ -47,8 +47,9 @@ class GalleryVisualDensityValue {
   bool operator ==(dynamic other) {
     if (runtimeType != other.runtimeType)
       return false;
-    final GalleryVisualDensityValue typedOther = other;
-    return visualDensity == typedOther.visualDensity && label == typedOther.label;
+    return other is GalleryVisualDensityValue
+        && visualDensity == other.visualDensity
+        && label == other.label;
   }
 
   @override

examples/flutter_gallery/test/drawer_test.dart

@@ -70,7 +70,7 @@ void main() {
     await tester.pumpAndSettle();
     await tester.tap(find.text('Compact'));
     await tester.pumpAndSettle();
-    app = find.byType(MaterialApp).evaluate().first.widget;
+    app = find.byType(MaterialApp).evaluate().first.widget as MaterialApp;
     expect(app.theme.visualDensity, equals(VisualDensity.compact));
 
     await tester.tap(find.byIcon(Icons.arrow_drop_down).at(2));
@@ -80,7 +80,7 @@ void main() {
         matching: find.text('System Default')
     ));
     await tester.pumpAndSettle();
-    app = find.byType(MaterialApp).evaluate().first.widget;
+    app = find.byType(MaterialApp).evaluate().first.widget as MaterialApp;
     expect(app.theme.visualDensity, equals(const VisualDensity()));
 
     // Verify platform settings