DropdownButtonFormField does not inherit local InputDecorationTheme

[bleroux]

Steps to reproduce

1. Run the code sample
2. Observe the color of the label

Expected results

Label is green

Actual results

Label is red (global theme color, local theme is ignored)

Code sample

Code sample

import 'package:flutter/material.dart';

void main() => runApp(const ReproApp());

class ReproApp extends StatelessWidget {
  const ReproApp({super.key});

  @override
  Widget build(BuildContext context) {
    final ThemeData themeData = ThemeData(
      brightness: Brightness.dark,
      inputDecorationTheme: const InputDecorationTheme(
        labelStyle: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
      ),
    );

    return MaterialApp(
      theme: themeData,
      home: Scaffold(
        body: Padding(
          padding: const EdgeInsets.all(8.0),
          child: SizedBox(
            width: 250,
            child: InputDecorationTheme(
              data: const InputDecorationThemeData(
                labelStyle: TextStyle(color: Colors.green, fontWeight: FontWeight.bold),
              ),
              child: DropdownButtonFormField<String>(
                onChanged: (_) {},
                decoration: const InputDecoration(labelText: 'DropdownButtonFormField'),
                items: const [DropdownMenuItem(value: 'selected', child: Text('Selected item'))],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

Screenshots or Video

Logs

Flutter Doctor output

Doctor output

Flutter (Channel [user-branch], 3.37.0-1.0.pre-381, on Ubuntu 24.04.2 LTS 6.8.0-84-generic, locale fr_FR.UTF-8)