Take InputDecoration's densityOffset into account when determining the button size

packages/dropdown_button2/CHANGELOG.md

@@ -19,6 +19,7 @@
 - Respect inputDecoration's borderRadius when barrierCoversButton is false.
 - Support BorderRadiusDirectional for dropdown menu.
 - Fix barrier when using TextDirection.rtl while barrierCoversButton set to false.
+- Take InputDecoration's densityOffset into account when determining the button size.
 
 ## 3.0.0-beta.21
 

packages/dropdown_button2/lib/src/dropdown_button2.dart

@@ -570,8 +570,11 @@ class _DropdownButton2State<T> extends State<DropdownButton2<T>> with WidgetsBin
     // Return the contentPadding only if inputDecoration is defined.
     if (widget._inputDecoration case final decoration?) {
       final TextDirection? textDirection = Directionality.maybeOf(context);
+      // Use inputDecorationTheme.visualDensity when added (https://github.com/flutter/flutter/issues/166201#issuecomment-2774622584)
+      final Offset densityOffset = Theme.of(context).visualDensity.baseSizeAdjustment;
       return (decoration.contentPadding ?? Theme.of(context).inputDecorationTheme.contentPadding)
-          ?.resolve(textDirection);
+          ?.add(EdgeInsets.symmetric(vertical: densityOffset.dy / 2))
+          .resolve(textDirection);
     } else {
       return null;
     }

packages/dropdown_button2_test/test/examples/form_field_example_test.dart

@@ -8,8 +8,6 @@ import 'test_app.dart';
 void main() {
   runGoldenTests(
     'FormField Example',
-    // NOTE: InputDecorator's contentPadding.vertical is incorrect on desktop
-    // until https://github.com/flutter/flutter/issues/166201 is fixed
     (WidgetTester tester, ViewVariant variant) async {
       // GIVEN
       await tester.pumpTestApp(const FormFieldExample());