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Fixes the case where IDAT is treated as unknown and saved; the first IDAT chunk ends up 'before' IDAT, the rest 'after', pngunknown has to take this into account since it checks before and after.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".