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Add split window
It is useful to be able to show two images in the same window allowing same transformation for both of them simultaneously. Then the user can visually compare two images.
- [ ] vertical split
- [ ] horizontal split
- [ ] z-split
Z-split is special feature allowing to locate two (or more) semi-transparent layers one over another. If each layer has different colour specification then the common parts and different parts will be colour-coded.