NestedScrollView throws exception caused by type mismatch #10925
Description
I tried to scroll NestedScrollView using by ScrollController.animateTo, then I got this exception:
══╡ EXCEPTION CAUGHT BY GESTURE ╞══
The following assertion was thrown while handling a gesture:
type '_Future<List>' is not a subtype of type 'Future<Null>' of 'function result' where
_Future is from dart:async
List is from dart:core
Future is from dart:async
Null is from dart:core
Either the assertion indicates an error in the framework itself, or we should provide substantially
more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new
When the exception was thrown, this was the stack:
#0 _NestedScrollCoordinator.animateTo (package:flutter/src/widgets/nested_scroll_view.dart:429:19)
#1 _NestedScrollPosition.animateTo (package:flutter/src/widgets/nested_scroll_view.dart:711:24)
#2 ScrollController.animateTo (package:flutter/src/widgets/scroll_controller.dart:147:37)
#3 scrollToTop (package:myapp/widget/app_bar_title.dart:6:22)
#4 MyTabBar.onTapDown (package:myapp/page/home.dart:260:9)
#5 MyTabBar.build.<anonymous closure> (package:myapp/page/home.dart:244:9)
#6 TapGestureRecognizer._checkDown.<anonymous closure> (package:flutter/src/gestures/tap.dart:138:57)
#7 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:71:24)
#8 TapGestureRecognizer._checkDown (package:flutter/src/gestures/tap.dart:138:9)
#9 TapGestureRecognizer.didExceedDeadline (package:flutter/src/gestures/tap.dart:110:5)
#11 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:366)
#12 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:394)
#13 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:151)
(elided one frame from package dart:async-patch)
Handler: onTapDown
Recognizer:
TapGestureRecognizer#f82c9(GestureRecognizerState.possible)
═════════════════════
_NestedScrollCoordinator.animateTo's return statement is this:
return Future.wait<Null>(resultFutures);Future.wait returns Future<List<Null>> but animateTo should return Future<Null>;
Flutter Doctor
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