Starting a drag event and finishing it outside the window still results in a crash

[Dev-Owl]

ListMixin.firstWhere (dart:collection/list.dart:167)
Input.onPointerRemoved (/Users/christian/Development/backbone/lib/prelude/input/mod.dart:97)
_BackboneGameWidgetState._handleEvent (/Users/christian/Development/backbone/lib/widget.dart:88)
PointerRouter._dispatch (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:98)
PointerRouter._dispatchEventToRoutes.<anonymous closure> (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:143)
_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:617)
PointerRouter._dispatchEventToRoutes (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:141)
PointerRouter.route (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/pointer_router.dart:133)
GestureBinding.dispatchEvent (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/binding.dart:423)
RendererBinding.dispatchEvent (/Users/christian/Development/flutter/packages/flutter/lib/src/rendering/binding.dart:337)
GestureBinding._handlePointerEventImmediately (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/binding.dart:395)
GestureBinding.handlePointerEvent (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/binding.dart:357)
GestureBinding._flushPointerEventQueue (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/binding.dart:314)
GestureBinding._handlePointerDataPacket (/Users/christian/Development/flutter/packages/flutter/lib/src/gestures/binding.dart:295)
_invoke1 (dart:ui/hooks.dart:167)
PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:341)
_dispatchPointerDataPacket (dart:ui/hooks.dart:94)

[Dev-Owl]

@skyne98 Please have a look at this, the current combination of Flutter & Flame events are quite hard to understnad (at least for me) you wrote the system and I guess you have a better idea how to deal with it.

I noticed that the pointer (id) in the remove event is always 0 and that the issue happens because the existing pointer can't be found due to its expected states.
I can't really answer why it's zero all the time and why we just check the two states of PointerStateHover and PointerStateAdded

[skyne98]

Might be addressed by my PR here 👀 Will test on my branch and see if it still fails there! It now uses only specific Flutter events, which are all children of PointerEvent.

[skyne98]

Looks like it does fix it, upon merging the PR, @Dev-Owl, can you please confirm the issue doesn't happen anymore and close this (#35) and #68?