Expose GestureSettings on FlutterView (#39997)

Author: goderbauer

lib/ui/fixtures/ui_test.dart

@@ -624,6 +624,8 @@ void hooksTests() async {
 
     expectEquals(window.viewConfiguration.gestureSettings,
       GestureSettings(physicalTouchSlop: 11.0));
+    expectEquals(window.gestureSettings,
+      GestureSettings(physicalTouchSlop: 11.0));
 
     _callHook(
       '_updateWindowMetrics',
@@ -652,6 +654,8 @@ void hooksTests() async {
 
     expectEquals(window.viewConfiguration.gestureSettings,
       GestureSettings(physicalTouchSlop: null));
+    expectEquals(window.gestureSettings,
+      GestureSettings(physicalTouchSlop: null));
 
     _callHook(
       '_updateWindowMetrics',
@@ -680,6 +684,8 @@ void hooksTests() async {
 
     expectEquals(window.viewConfiguration.gestureSettings,
       GestureSettings(physicalTouchSlop: 22.0));
+    expectEquals(window.gestureSettings,
+      GestureSettings(physicalTouchSlop: 22.0));
   });
 
   await test('onLocaleChanged preserves callback zone', () {

lib/ui/window.dart

@@ -226,6 +226,13 @@ class FlutterView {
   ///   applications.
   ViewPadding get padding => viewConfiguration.padding;
 
+  /// Additional configuration for touch gestures performed on this view.
+  ///
+  /// For example, the touch slop defined in physical pixels may be provided
+  /// by the gesture settings and should be preferred over the framework
+  /// touch slop constant.
+  GestureSettings get gestureSettings => viewConfiguration.gestureSettings;
+
   /// {@macro dart.ui.ViewConfiguration.displayFeatures}
   ///
   /// When this changes, [PlatformDispatcher.onMetricsChanged] is called.

lib/web_ui/lib/window.dart

@@ -15,6 +15,7 @@ abstract class FlutterView {
   ViewPadding get viewPadding => viewConfiguration.viewPadding;
   ViewPadding get systemGestureInsets => viewConfiguration.systemGestureInsets;
   ViewPadding get padding => viewConfiguration.padding;
+  GestureSettings get gestureSettings => viewConfiguration.gestureSettings;
   List<DisplayFeature> get displayFeatures => viewConfiguration.displayFeatures;
   void render(Scene scene) => platformDispatcher.render(scene, this);
   void updateSemantics(SemanticsUpdate update) => platformDispatcher.updateSemantics(update);