Fix project name fallback (#150614)

This PR changes the project name logic for `flutter create` to look for the name in the pubspec.yaml `name` field,
before falling back to the directory name.

Fixes https://github.com/flutter/flutter/issues/53106 

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

packages/flutter_tools/lib/src/commands/create_base.dart

@@ -4,6 +4,7 @@
 
 import 'package:meta/meta.dart';
 import 'package:uuid/uuid.dart';
+import 'package:yaml/yaml.dart';
 
 import '../android/android.dart' as android_common;
 import '../android/android_workflow.dart';
@@ -319,13 +320,45 @@ abstract class CreateBase extends FlutterCommand {
     }
   }
 
-  /// Gets the project name based.
+  /// Gets the project name.
   ///
-  /// Use the current directory path name if the `--project-name` is not specified explicitly.
+  /// If the `--project-name` is not specified explicitly,
+  /// the `name` field from the pubspec.yaml file is used.
+  ///
+  /// If the pubspec.yaml file does not exist,
+  /// the current directory path name is used.
   @protected
   String get projectName {
-    final String projectName =
-        stringArg('project-name') ?? globals.fs.path.basename(projectDirPath);
+    String? projectName = stringArg('project-name');
+
+    if (projectName == null) {
+      final File pubspec = globals.fs
+        .directory(projectDirPath)
+        .childFile('pubspec.yaml');
+
+      if (pubspec.existsSync()) {
+        final String pubspecContents = pubspec.readAsStringSync();
+
+        try {
+          final Object? pubspecYaml = loadYaml(pubspecContents);
+
+          if (pubspecYaml is YamlMap) {
+            final Object? pubspecName = pubspecYaml['name'];
+
+            if (pubspecName is String) {
+              projectName = pubspecName;
+            }
+          }
+        } on YamlException {
+          // If the pubspec is malformed, fallback to using the directory name.
+        }
+      }
+
+      final String projectDirName = globals.fs.path.basename(projectDirPath);
+
+      projectName ??= projectDirName;
+    }
+
     if (!boolArg('skip-name-checks')) {
       final String? error = _validateProjectName(projectName);
       if (error != null) {

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -824,6 +824,30 @@ void main() {
     );
   });
 
+  testUsingContext('recreating project uses pubspec name as project name fallback', () async {
+    final Directory outputDirectory = tempDir.childDirectory('invalid-name');
+
+    // Create the new project with a valid project name,
+    // but with a directory name that would be an invalid project name.
+    await _createProject(
+      outputDirectory,
+      <String>['--no-pub', '--template=app', '--project-name', 'valid_name', '--platforms' , 'android'],
+      <String>[]
+    );
+
+    // Now amend a new platform to the project, but omit the project name, so the fallback project name is used.
+    await _createProject(
+      outputDirectory,
+      <String>['--no-pub', '--template=app', '--platforms', 'web'],
+      <String>[]
+    );
+
+    // Verify that the pubspec name was used as project name for the web project.
+    final File webOutputFile = outputDirectory.childDirectory('web').childFile('index.html');
+
+    expect(webOutputFile.readAsStringSync(), contains('<title>valid_name</title>'));
+  });
+
   testUsingContext('module project with pub', () async {
     return _createProject(projectDir, <String>[
       '--template=module',