Drop transparent titlebar on macOS (#2284)

Simplifying the codelab, reducing unrequired complexity. Even if looks better.

If you need help, consider asking for advice on the #hackers-devrel channel on [Discord].

[Effective Dart: Style]: https://dart.dev/guides/language/effective-dart/style

Author: domesticmouse

intro_flutter_gpu/codelab_rebuild.yaml

@@ -6,8 +6,6 @@ steps:
         rmdir: step_01
       - name: Create project
         flutter: create --empty intro_flutter_gpu --platforms android,ios,macos,windows,linux
-      - name: Make the macOS titlebar transparent, content full window, and hide the title bar.
-        full-screen-macos-main-menu-xib: intro_flutter_gpu/macos/Runner/Base.lproj/MainMenu.xib
       - name: Strip DEVELOPMENT_TEAM
         strip-lines-containing: DEVELOPMENT_TEAM =
         path: intro_flutter_gpu/ios/Runner.xcodeproj/project.pbxproj
@@ -52,13 +50,13 @@ steps:
         flutter: pub add flutter_gpu --sdk=flutter 
       - name: Add dependencies
         path: intro_flutter_gpu
-        flutter: pub add flutter_gpu_shaders native_assets_cli vector_math xml
+        flutter: pub add flutter_gpu_shaders native_assets_cli vector_math
       - name: Patch pubspec.yaml
         path: intro_flutter_gpu/pubspec.yaml
         patch-u : |
           --- b/intro_flutter_gpu/step_01/pubspec.yaml
           +++ a/intro_flutter_gpu/step_01/pubspec.yaml
-          @@ -23,3 +23,6 @@ dev_dependencies:
+          @@ -22,3 +22,6 @@ dev_dependencies:
            
            flutter:
              uses-material-design: true
@@ -195,31 +193,6 @@ steps:
             @override
             bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
           }
-      - name: mkdir bin
-        mkdir: intro_flutter_gpu/bin
-      - name: Add bin/modify_macos_config.dart
-        path: intro_flutter_gpu/bin/modify_macos_config.dart
-        replace-contents: |
-          // Copyright 2024 The Flutter Authors. All rights reserved.
-          // Use of this source code is governed by a BSD-style license that can be
-          // found in the LICENSE file.
-          
-          import 'dart:io';
-          import 'package:xml/xml.dart';
-          import 'package:xml/xpath.dart';
-          
-          void main() {
-            final file = File('macos/Runner/Base.lproj/MainMenu.xib');
-            var document = XmlDocument.parse(file.readAsStringSync());
-            document.xpath('//document/objects/window').first
-              ..setAttribute('titlebarAppearsTransparent', 'YES')
-              ..setAttribute('titleVisibility', 'hidden');
-            document
-                .xpath('//document/objects/window/windowStyleMask')
-                .first
-                .setAttribute('fullSizeContentView', 'YES');
-            file.writeAsStringSync(document.toString());
-          }
       - name: Add my_first_triangle.shaderbundle.json
         path: intro_flutter_gpu/my_first_triangle.shaderbundle.json
         replace-contents: |
@@ -1162,7 +1135,7 @@ steps:
         patch-u: |
           --- b/intro_flutter_gpu/step_12/pubspec.yaml
           +++ a/intro_flutter_gpu/step_12/pubspec.yaml
-          @@ -24,4 +24,4 @@ flutter:
+          @@ -23,4 +23,4 @@ flutter:
              uses-material-design: true
            
              assets:

intro_flutter_gpu/step_01/bin/modify_macos_config.dart

@@ -330,8 +330,8 @@
             </items>
             <point key="canvasLocation" x="142" y="-258"/>
         </menu>
-        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target" titlebarAppearsTransparent="YES" titleVisibility="hidden">
-            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES" fullSizeContentView="YES"/>
+        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <rect key="contentRect" x="335" y="390" width="800" height="600"/>
             <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1577"/>
             <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">

intro_flutter_gpu/step_01/macos/Runner/Base.lproj/MainMenu.xib

@@ -14,7 +14,6 @@ dependencies:
   flutter_gpu_shaders: ^0.2.0
   native_assets_cli: ^0.9.0
   vector_math: ^2.1.4
-  xml: ^6.5.0
 
 dev_dependencies:
   flutter_test:

intro_flutter_gpu/step_01/pubspec.yaml

@@ -330,8 +330,8 @@
             </items>
             <point key="canvasLocation" x="142" y="-258"/>
         </menu>
-        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target" titlebarAppearsTransparent="YES" titleVisibility="hidden">
-            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES" fullSizeContentView="YES"/>
+        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <rect key="contentRect" x="335" y="390" width="800" height="600"/>
             <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1577"/>
             <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">

intro_flutter_gpu/step_02/bin/modify_macos_config.dart

@@ -14,7 +14,6 @@ dependencies:
   flutter_gpu_shaders: ^0.2.0
   native_assets_cli: ^0.9.0
   vector_math: ^2.1.4
-  xml: ^6.5.0
 
 dev_dependencies:
   flutter_test:

intro_flutter_gpu/step_02/macos/Runner/Base.lproj/MainMenu.xib

@@ -330,8 +330,8 @@
             </items>
             <point key="canvasLocation" x="142" y="-258"/>
         </menu>
-        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target" titlebarAppearsTransparent="YES" titleVisibility="hidden">
-            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES" fullSizeContentView="YES"/>
+        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
             <rect key="contentRect" x="335" y="390" width="800" height="600"/>
             <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1577"/>
             <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">

intro_flutter_gpu/step_02/pubspec.yaml

@@ -14,7 +14,6 @@ dependencies:
   flutter_gpu_shaders: ^0.2.0
   native_assets_cli: ^0.9.0
   vector_math: ^2.1.4
-  xml: ^6.5.0
 
 dev_dependencies:
   flutter_test: