异常能否处理下

[wuyanghu]

进到详情划几下，就有手势问题：
======== Exception caught by gesture library =======================================================
The following assertion was thrown while routing a pointer event:
The position being added (Offset(272.7, 426.3)) has a smaller timestamp (72:24:34.567289) than its predecessor: _PointAtTime(Offset(273.3, 409.0) at 72:24:34.583966).

When the exception was thrown, this was the stack:
#0 IOSScrollViewFlingVelocityTracker.addPosition. (package:flutter/src/gestures/velocity_tracker.dart:316:7)
#1 IOSScrollViewFlingVelocityTracker.addPosition (package:flutter/src/gestures/velocity_tracker.dart:320:6)
#2 DragGestureRecognizer.handleEvent (package:flutter/src/gestures/monodrag.dart:666:41)
#3 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:97:12)
#4 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:143:9)
#5 _LinkedHashMapMixin.forEach (dart:_compact_hash:764:13)
#6 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:141:18)
#7 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:131:7)
#8 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:530:19)
#9 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:499:22)
#10 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:473:11)
#11 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:437:7)
#12 PointerEventResampler._samplePointerPosition (package:flutter/src/gestures/resampler.dart:285:15)
#13 PointerEventResampler.sample (package:flutter/src/gestures/resampler.dart:324:7)
#14 _Resampler.sample (package:flutter/src/gestures/binding.dart:157:17)
#15 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:387:18)
#16 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:341:7)
#17 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:308:9)
#21 _invoke1 (dart:ui/hooks.dart:349:10)
#22 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:467:7)
#23 _dispatchPointerDataPacket (dart:ui/hooks.dart:282:31)
(elided 3 frames from dart:async)