Fixing IllegalArgumentException while using many fingers to zooming #579
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This is a fix to a android framework bug, which occurs when zooming on an image inside a ViewPager. Related to this bug: #563 (comment)
Known bugs:
Baseflow/PhotoView#31
https://stackoverflow.com/questions/26315781/illegalargumentexception-pointerindex-out-of-range-when-i-pinchzoom-the-image