Paddy Xu 734b0e36e3 Fix #128: the "previous state" of a "DisposeOpPrevious" frame is its previous frame - for example, ...

1: APNGDisposeOpNone
2: APNGDisposeOpNone        // should use rendered frame 1
3: APNGDisposeOpPrevious    // should use rendered frame 1
4: APNGDisposeOpPrevious    // should use rendered frame 1, NOT frame 2
5: APNGDisposeOpNone        // should use rendered frame 4

2017-11-16 18:53:12 +02:00

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