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Dylan M. Taylor
f79a425ca9
* xlsx: find a reused picture through a content hash instead of comparing every media part Out::image_part compared each new picture byte by byte with every media part written so far, so a workbook of many distinct pictures sharing a long prefix was exported in quadratic time. Media parts are now indexed by extension and SHA-256. * address review: index preserved media parts when they are added * address review: do not hash an image twice when it is first added