Landscape mode issue: Extra scroll area shown

[userSV]

Steps to reproduce:

1. Double tap image in portrait mode to zoom
2. Move the device to landscape mode
3. Press and move the image , there is large extra black area shown
   

[3lvis]

Damn, this is not good. Sadly I haven't been using this library for a while and can't afford to spend the time to fix it. If you could (please) find a fix, I'll be happy to merge it.