zooming in and out in image crashes sometimes

[swentel]

Error message is 'pointerIndex out of range'

Process: com.indieweb.indigenous, PID: 21308
    java.lang.IllegalArgumentException: pointerIndex out of range
        at android.view.MotionEvent.nativeGetAxisValue(Native Method)
        at android.view.MotionEvent.getX(MotionEvent.java:2519)
        at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:2066)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2696)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3159)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2844)
        at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:601)
        at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
        at android.app.Activity.dispatchTouchEvent(Activity.java:3384)
        at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
        at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:563)
        at android.view.View.dispatchPointerEvent(View.java:12788)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5670)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5465)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5011)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4977)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5114)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4985)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5171)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5011)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4977)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4985)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7736)
        at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7676)
        at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7637)
        at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7847)
        at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:197)
        at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
        at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:186)
        at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:7810)
        at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:7874)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
        at android.view.Choreographer.doCallbacks(Choreographer.java:723)
        at android.view.Choreographer.doFrame(Choreographer.java:652)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6944)
2019-01-11 11:01:01.386 21308-21308/com.indieweb.indigenous E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

[swentel]

Implemented a fix based on Baseflow/PhotoView#31 (comment)