[flutter_tools] update feature defaults (#102937)

packages/flutter_tools/lib/src/features.dart

@@ -92,12 +92,15 @@ const Feature flutterMacOSDesktopFeature = Feature(
   environmentOverride: 'FLUTTER_MACOS',
   master: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
   beta: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
   stable: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
 );
 
@@ -108,12 +111,15 @@ const Feature flutterLinuxDesktopFeature = Feature(
   environmentOverride: 'FLUTTER_LINUX',
   master: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
   beta: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
   stable: FeatureChannelSetting(
     available: true,
+    enabledByDefault: true,
   ),
 );
 

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

@@ -364,5 +364,25 @@ void main() {
 
       expect(featureFlags.isWindowsEnabled, true);
     });
+
+    for (final Feature feature in <Feature>[
+      flutterWindowsDesktopFeature,
+      flutterMacOSDesktopFeature,
+      flutterLinuxDesktopFeature,
+    ]) {
+      test('${feature.name} available and enabled by default on master', () {
+        expect(feature.master.enabledByDefault, true);
+        expect(feature.master.available, true);
+      });
+      test('${feature.name} available and enabled by default on beta', () {
+        expect(feature.beta.enabledByDefault, true);
+        expect(feature.beta.available, true);
+      });
+      test('${feature.name} available and enabled by default on stable', () {
+        expect(feature.stable.enabledByDefault, true);
+        expect(feature.stable.available, true);
+      });
+    }
+
   });
 }