Consider the Windows app template stable (#66022)

Removes the template version from the Windows template; the API and
tooling boundary will now be considered stable, so there will no longer
be frequent breaking changes.

Also updates the link for adding desktop support to a project for all
three platforms to reflect the current location.

Fixes https://github.com/flutter/flutter/issues/52748

packages/flutter_tools/lib/src/linux/build_linux.dart

@@ -26,7 +26,7 @@ Future<void> buildLinux(
   }) async {
   if (!linuxProject.cmakeFile.existsSync()) {
     throwToolExit('No Linux desktop project configured. See '
-      'https://github.com/flutter/flutter/wiki/Desktop-shells#create '
+      'https://flutter.dev/desktop#add-desktop-support-to-an-existing-app '
       'to learn about adding Linux support to a project.');
   }
 

packages/flutter_tools/lib/src/macos/build_macos.dart

@@ -31,7 +31,7 @@ Future<void> buildMacOS({
 }) async {
   if (!flutterProject.macos.xcodeWorkspace.existsSync()) {
     throwToolExit('No macOS desktop project configured. '
-      'See https://flutter.dev/desktop#add-desktop-support-to-an-existing-flutter-project '
+      'See https://flutter.dev/desktop#add-desktop-support-to-an-existing-app '
       'to learn about adding macOS support to a project.');
   }
 

packages/flutter_tools/lib/src/windows/build_windows.dart

@@ -31,25 +31,11 @@ Future<void> buildWindows(WindowsProject windowsProject, BuildInfo buildInfo, {
 }) async {
   if (!windowsProject.cmakeFile.existsSync()) {
     throwToolExit(
-      'No Windows desktop project configured. '
-      'See https://github.com/flutter/flutter/wiki/Desktop-shells#create '
+      'No Windows desktop project configured. See '
+      'https://flutter.dev/desktop#add-desktop-support-to-an-existing-app '
       'to learn about adding Windows support to a project.');
   }
 
-  // Check for incompatibility between the Flutter tool version and the project
-  // template version, since the tempalte isn't stable yet.
-  final int templateCompareResult = _compareTemplateVersions(windowsProject);
-  if (templateCompareResult < 0) {
-    throwToolExit('The Windows runner was created with an earlier version of '
-      'the template, which is not yet stable.\n\n'
-      'Delete the windows/ directory and re-run \'flutter create .\', '
-      're-applying any previous changes.');
-  } else if (templateCompareResult > 0) {
-    throwToolExit('The Windows runner was created with a newer version of the '
-      'template, which is not yet stable.\n\n'
-      'Upgrade Flutter and try again.');
-  }
-
   // Ensure that necessary emphemeral files are generated and up to date.
   _writeGeneratedFlutterConfig(windowsProject, buildInfo, target);
   createPluginSymlinks(windowsProject.parent);
@@ -189,25 +175,3 @@ void _writeGeneratedFlutterConfig(
   }
   writeGeneratedCmakeConfig(Cache.flutterRoot, windowsProject, environment);
 }
-
-// Checks the template version of [project] against the current template
-// version. Returns < 0 if the project is older than the current template, > 0
-// if it's newer, and 0 if they match.
-int _compareTemplateVersions(WindowsProject project) {
-  const String projectVersionBasename = '.template_version';
-  final int expectedVersion = int.parse(globals.fs.file(globals.fs.path.join(
-    globals.fs.path.absolute(Cache.flutterRoot),
-    'packages',
-    'flutter_tools',
-    'templates',
-    'app',
-    'windows.tmpl',
-    'flutter',
-    projectVersionBasename,
-  )).readAsStringSync());
-  final File projectVersionFile = project.managedDirectory.childFile(projectVersionBasename);
-  final int version = projectVersionFile.existsSync()
-      ? int.tryParse(projectVersionFile.readAsStringSync())
-      : 0;
-  return version.compareTo(expectedVersion);
-}

packages/flutter_tools/templates/app/windows.tmpl/flutter/.template_version

@@ -1 +0,0 @@
-7

packages/flutter_tools/templates/template_manifest.json

@@ -79,7 +79,6 @@
         "templates/app/linux.tmpl/my_application.cc.tmpl",
         "templates/app/linux.tmpl/.gitignore",
         "templates/app/linux.tmpl/CMakeLists.txt.tmpl",
-        "templates/app/linux.tmpl/flutter/.template_version",
         "templates/app/linux.tmpl/flutter/CMakeLists.txt",
         "templates/app/linux.tmpl/main.cc",
         "templates/app/linux.tmpl/my_application.cc",
@@ -121,7 +120,6 @@
         "templates/app/web/manifest.json.tmpl",
         "templates/app/windows.tmpl/.gitignore",
         "templates/app/windows.tmpl/CMakeLists.txt.tmpl",
-        "templates/app/windows.tmpl/flutter/.template_version",
         "templates/app/windows.tmpl/flutter/CMakeLists.txt",
         "templates/app/windows.tmpl/runner/CMakeLists.txt",
         "templates/app/windows.tmpl/runner/flutter_window.cpp",

packages/flutter_tools/test/commands.shard/hermetic/build_windows_test.dart

@@ -68,26 +68,6 @@ void main() {
   void setUpMockProjectFilesForBuild({int templateVersion}) {
     fileSystem.file(buildFilePath).createSync(recursive: true);
     setUpMockCoreProjectFiles();
-
-    final String versionFileSubpath = fileSystem.path.join('flutter', '.template_version');
-    const int expectedTemplateVersion = 10;  // Arbitrary value for tests.
-    final File sourceTemplateVersionfile = fileSystem.file(fileSystem.path.join(
-      fileSystem.path.absolute(Cache.flutterRoot),
-      'packages',
-      'flutter_tools',
-      'templates',
-      'app',
-      'windows.tmpl',
-      versionFileSubpath,
-    ));
-    sourceTemplateVersionfile.createSync(recursive: true);
-    sourceTemplateVersionfile.writeAsStringSync(expectedTemplateVersion.toString());
-
-    final File projectTemplateVersionFile = fileSystem.file(
-      fileSystem.path.join('windows', versionFileSubpath));
-    templateVersion ??= expectedTemplateVersion;
-    projectTemplateVersionFile.createSync(recursive: true);
-    projectTemplateVersionFile.writeAsStringSync(templateVersion.toString());
   }
 
   // Returns the command matching the build_windows call to generate CMake
@@ -184,38 +164,6 @@ void main() {
     FeatureFlags: () => TestFeatureFlags(isWindowsEnabled: true),
   });
 
-  testUsingContext('Windows build fails with instructions when template is too old', () async {
-    final BuildWindowsCommand command = BuildWindowsCommand()
-      ..visualStudioOverride = mockVisualStudio;
-    applyMocksToCommand(command);
-    setUpMockProjectFilesForBuild(templateVersion: 1);
-
-    expect(createTestCommandRunner(command).run(
-      const <String>['windows', '--no-pub']
-    ), throwsToolExit(message: 'flutter create .'));
-  }, overrides: <Type, Generator>{
-    FileSystem: () => fileSystem,
-    ProcessManager: () => FakeProcessManager.any(),
-    Platform: () => windowsPlatform,
-    FeatureFlags: () => TestFeatureFlags(isWindowsEnabled: true),
-  });
-
-  testUsingContext('Windows build fails with instructions when template is too new', () async {
-    final BuildWindowsCommand command = BuildWindowsCommand()
-      ..visualStudioOverride = mockVisualStudio;
-    applyMocksToCommand(command);
-    setUpMockProjectFilesForBuild(templateVersion: 999);
-
-    expect(createTestCommandRunner(command).run(
-      const <String>['windows', '--no-pub']
-    ), throwsToolExit(message: 'Upgrade Flutter'));
-  }, overrides: <Type, Generator>{
-    FileSystem: () => fileSystem,
-    ProcessManager: () => FakeProcessManager.any(),
-    Platform: () => windowsPlatform,
-    FeatureFlags: () => TestFeatureFlags(isWindowsEnabled: true),
-  });
-
   testUsingContext('Windows build does not spew stdout to status logger', () async {
     final BuildWindowsCommand command = BuildWindowsCommand()
       ..visualStudioOverride = mockVisualStudio;