[BUG] single finger swipe triggering PhotoViewScaleState.zoomedOut

[blaneyneil]

after setting up a scaleState listener, via the standard method:

_scaleStateController = PhotoViewScaleStateController()..outputScaleStateStream.listen(_photoStateListener);

PhotoView(
      scaleStateController: _scaleStateController,
),

a single finger swipe (as in a gesture someone would make if they were trying to swipe to another card) in any direction and or any distance is triggering this from the listener:

flutter: val = PhotoViewScaleState.zoomedOut
flutter: val = PhotoViewScaleState.initial

which means that if you're acting on a zoom (eg, hiding/showing a menu, changing bg color, etc) all of those actions will toggle upon the false zoom. resulting in blinks, flashes, etc.

this is for iOS using photo_view: "^0.9.0"

[renancaraujo]

Fixed on #267

Thanks for pointing it out.