_dismissedBottomSheets assertion failure in ScaffoldState.showBottomSheet #3232
Description
Open the Stocks app. Double-tap on a symbol to show the pop-up at the bottom of the screen. Repeatedly drag the pop-up down and up with fast motions.
Eventually this assertion will trigger:
7ms total 13.123ms
I/flutter (18081): ══╡ EXCEPTION CAUGHT BY GESTURE LIBRARY ╞═══════════════════════════════════════════════════════════════════════════════
I/flutter (18081): The following exception was raised while routing a pointer event:
I/flutter (18081): 'package:flutter/src/material/scaffold.dart': Failed assertion: line 402: '_dismissedBottomSheets != null' is not true.
I/flutter (18081): Either the assertion indicates an error in the framework itself, or we should provide substantially more information in
I/flutter (18081): this error message to help you determine and fix the underlying cause.
I/flutter (18081): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (18081): https://github.com/flutter/flutter/issues/new
I/flutter (18081): Event:
I/flutter (18081): PointerMoveEvent(Point(206.3, 569.0))
I/flutter (18081): Stack trace:
I/flutter (18081): #0 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:27)
I/flutter (18081): #1 ScaffoldState.showBottomSheet.<anonymous closure> (package:flutter/src/material/scaffold.dart:402)
I/flutter (18081): #2 _PersistentBottomSheetState._handleStatusChange (package:flutter/src/material/scaffold.dart:702)
I/flutter (18081): #3 Animation&AnimationEagerListenerMixin&AnimationLocalListenersMixin&AnimationLocalStatusListenersMixin.notifyStatusListeners (package:flutter/src/animation/listener_helpers.dart:87)
I/flutter (18081): #4 AnimationController._checkStatusChanged (package:flutter/src/animation/animation_controller.dart:240)
I/flutter (18081): #5 AnimationController.value= (package:flutter/src/animation/animation_controller.dart:124)
I/flutter (18081): #6 _BottomSheetState._handleDragUpdate (package:flutter/src/material/bottom_sheet.dart:102)
I/flutter (18081): #7 _DragGestureRecognizer.handleEvent (package:flutter/src/gestures/drag.dart:77)
I/flutter (18081): #8 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:53)
I/flutter (18081): #9 BindingBase&Scheduler&Gesturer.handleEvent (package:flutter/src/gestures/binding.dart:110)
I/flutter (18081): #10 BindingBase&Scheduler&Gesturer.dispatchEvent (package:flutter/src/gestures/binding.dart:88)
I/flutter (18081): #11 BindingBase&Scheduler&Gesturer._handlePointerEvent (package:flutter/src/gestures/binding.dart:70)
I/flutter (18081): #12 BindingBase&Scheduler&Gesturer._handlePointerPacket (package:flutter/src/gestures/binding.dart:42)
I/flutter (18081): #13 _dispatchPointerPacket (file:///ssd2/sky/engine/src/out/android_Debug/gen/sky/bindings/hooks.dart:43)
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