NavigationSheet throws assertion error when starting to scroll in list view during page transition

[fujidaiti]

Steps to reproduce

1. Apply the patch below to tutorial/imperative_navigation_sheet.dart.
2. Run the app and press the Next button.
3. Start dragging in the list view and keep holding your finger until the transition is complete.

diff --git forkSrcPrefix/cookbook/lib/tutorial/imperative_navigation_sheet.dart forkDstPrefix/cookbook/lib/tutorial/imperative_navigation_sheet.dart
index df9a733e123d51e1703f87865f3aaf0c56e0d9b8..18874db5f833c4ae6cd556acd9228f32ce8eb4fe 100644
--- forkSrcPrefix/cookbook/lib/tutorial/imperative_navigation_sheet.dart
+++ forkDstPrefix/cookbook/lib/tutorial/imperative_navigation_sheet.dart
@@ -68,6 +68,7 @@ class _DraggablePage extends StatelessWidget {
   void navigateToScrollablePage(BuildContext context) {
     // Use ScrollableNavigationSheetRoute for a scrollable page.
     final route = ScrollableNavigationSheetRoute(
+      transitionDuration: const Duration(seconds: 1),
       builder: (context) {
         return const _ScrollablePage();
       },

RocketSim_Recording_iPhone_15_6.1_2024-06-09_23.52.36.mp4

Error log

════════ Exception caught by animation library ═════════════════════════════════
The following assertion was thrown while notifying status listeners for ProxyAnimation:
'package:smooth_sheets/src/foundation/sheet_extent.dart': Failed assertion: line 400 pos 16: 'currentDrag != null': is not true.

When the exception was thrown, this was the stack:
#2      SheetExtent.beginActivity (package:smooth_sheets/src/foundation/sheet_extent.dart:400:16)
#3      NavigationSheetExtent.handleRouteTransition (package:smooth_sheets/src/navigation/navigation_sheet_extent.dart:34:9)
#4      _NavigationSheetState.didChangeTransitionState (package:smooth_sheets/src/navigation/navigation_sheet.dart:45:35)
#5      TransitionAwareStateMixin._notify (package:smooth_sheets/src/internal/transition_observer.dart:67:7)
#6      TransitionAwareStateMixin.didPush.transitionStatusListener (package:smooth_sheets/src/internal/transition_observer.dart:94:13)
#7      AnimationLocalStatusListenersMixin.notifyStatusListeners (package:flutter/src/animation/listener_helpers.dart:240:19)
#8      AnimationLocalStatusListenersMixin.notifyStatusListeners (package:flutter/src/animation/listener_helpers.dart:240:19)
#9      AnimationController._checkStatusChanged (package:flutter/src/animation/animation_controller.dart:841:7)
#10     AnimationController._tick (package:flutter/src/animation/animation_controller.dart:857:5)
#11     Ticker._tick (package:flutter/src/scheduler/ticker.dart:258:12)
#12     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392:15)
#13     SchedulerBinding.handleBeginFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1235:11)
#14     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
#15     SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:1233:17)
#16     SchedulerBinding._handleBeginFrame (package:flutter/src/scheduler/binding.dart:1150:5)
#17     _invoke1 (dart:ui/hooks.dart:328:13)
#18     PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:397:5)
#19     _beginFrame (dart:ui/hooks.dart:272:31)
(elided 2 frames from class _AssertionError)

The ProxyAnimation notifying status listeners was: AnimationController#43934(⏭ 1.000; paused; for ScrollableNavigationSheetRoute<dynamic>)➩ProxyAnimation
════════════════════════════════════════════════════════════════════════════════
Application finished.

Exited.

[fujidaiti]

Should touch events be ignored during a page transition?

[appinteractive]

Should touch events be ignored during a page transition?

Would be the easiest fix I guess And solve a lot of potential issues from my prospective.