Fix DDS do not support Curves.easeInOutBack curve (#114222)

Author: xu-baolin

packages/flutter/lib/src/widgets/draggable_scrollable_sheet.dart

@@ -136,13 +136,12 @@ class DraggableScrollableController extends ChangeNotifier {
         animationController.value,
         _attachedController!.position.context.notificationContext!,
       );
-      if (animationController.value > _attachedController!.extent.maxSize ||
-          animationController.value < _attachedController!.extent.minSize) {
-        // Animation hit the max or min size, stop animating.
-        animationController.stop(canceled: false);
-      }
     });
-    await animationController.animateTo(size, duration: duration, curve: curve);
+    await animationController.animateTo(
+      clampDouble(size, _attachedController!.extent.minSize, _attachedController!.extent.maxSize),
+      duration: duration,
+      curve: curve,
+    );
   }
 
   /// Jumps the attached sheet from its current size to the given [size], a
@@ -579,7 +578,11 @@ class _DraggableSheetExtent {
   /// or a user drag.
   void updateSize(double newSize, BuildContext context) {
     assert(newSize != null);
-    _currentSize.value = clampDouble(newSize, minSize, maxSize);
+    final double clampedSize = clampDouble(newSize, minSize, maxSize);
+    if (_currentSize.value == clampedSize) {
+      return;
+    }
+    _currentSize.value = clampedSize;
     DraggableScrollableNotification(
       minExtent: minSize,
       maxExtent: maxSize,

packages/flutter/test/widgets/draggable_scrollable_sheet_test.dart

@@ -950,9 +950,7 @@ void main() {
       goTo(.5);
       await tester.pumpAndSettle();
       goTo(0);
-      // The animation was cut short by half, there should have been on less pumps
-      final int truncatedPumpCount = shouldAnimate ? expectedPumpCount - 1 : expectedPumpCount;
-      expect(await tester.pumpAndSettle(), truncatedPumpCount);
+      expect(await tester.pumpAndSettle(), expectedPumpCount);
       expect(
         tester.getSize(find.byKey(containerKey)).height / screenHeight,
         closeTo(.25, precisionErrorTolerance),
@@ -1007,6 +1005,29 @@ void main() {
     );
   });
 
+  testWidgets('Can animateTo with a Curves.easeInOutBack curve begin min-size', (WidgetTester tester) async {
+    const Key stackKey = ValueKey<String>('stack');
+    const Key containerKey = ValueKey<String>('container');
+    final DraggableScrollableController controller = DraggableScrollableController();
+    await tester.pumpWidget(boilerplateWidget(
+      null,
+      initialChildSize: 0.25,
+      controller: controller,
+      stackKey: stackKey,
+      containerKey: containerKey,
+    ));
+    await tester.pumpAndSettle();
+    final double screenHeight = tester.getSize(find.byKey(stackKey)).height;
+
+    controller.animateTo(.6, curve: Curves.easeInOutBack, duration: const Duration(milliseconds: 500));
+
+    await tester.pumpAndSettle();
+    expect(
+      tester.getSize(find.byKey(containerKey)).height / screenHeight,
+      closeTo(.6, precisionErrorTolerance),
+    );
+  });
+
   testWidgets('Can reuse a controller after the old controller is disposed', (WidgetTester tester) async {
     const Key stackKey = ValueKey<String>('stack');
     const Key containerKey = ValueKey<String>('container');