[flutter_tools] Sort plugins alphabetically when refreshed (#73803)

packages/flutter_tools/lib/src/plugins.dart

@@ -1139,7 +1139,8 @@ Future<void> refreshPluginsList(
   bool macOSPlatform = false,
 }) async {
   final List<Plugin> plugins = await findPlugins(project);
-
+  // Sort the plugins by name to keep ordering stable in generated files.
+  plugins.sort((Plugin left, Plugin right) => left.name.compareTo(right.name));
   // TODO(franciscojma): Remove once migration is complete.
   // Write the legacy plugin files to avoid breaking existing apps.
   final bool legacyChanged = _writeFlutterPluginsListLegacy(project, plugins);

packages/flutter_tools/test/general.shard/plugins_test.dart

@@ -390,14 +390,25 @@ dependencies:
         ProcessManager: () => FakeProcessManager.any(),
       });
 
-      testUsingContext('Refreshing the plugin list creates a plugin directory when there are plugins', () async {
-        createFakePlugin(fs);
+      testUsingContext('Refreshing the plugin list creates a sorted plugin directory when there are plugins', () async {
+        createFakePlugins(fs, <String>[
+          'plugin_d',
+          'plugin_a',
+          '/local_plugins/plugin_c',
+          '/local_plugins/plugin_b'
+        ]);
+
         when(iosProject.existsSync()).thenReturn(true);
 
         await refreshPluginsList(flutterProject);
 
         expect(flutterProject.flutterPluginsFile.existsSync(), true);
         expect(flutterProject.flutterPluginsDependenciesFile.existsSync(), true);
+
+        final String pluginsFileContents = flutterProject.flutterPluginsFile.readAsStringSync();
+        expect(pluginsFileContents.indexOf('plugin_a'), lessThan(pluginsFileContents.indexOf('plugin_b')));
+        expect(pluginsFileContents.indexOf('plugin_b'), lessThan(pluginsFileContents.indexOf('plugin_c')));
+        expect(pluginsFileContents.indexOf('plugin_c'), lessThan(pluginsFileContents.indexOf('plugin_d')));
       }, overrides: <Type, Generator>{
         FileSystem: () => fs,
         ProcessManager: () => FakeProcessManager.any(),