Bug #416
Exiv2 modify action always writes from metadata
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Description
The modify action of the exiv2 utility should use the non-intrusive writing logic whenever possible. Instead, it always writes from metadata, independent of the modification.
Additional information:
Modify::clone uses the half-cooked ExifData copy construction which sets ExifData::compatible_ to false with the described effect.
Replace the ExifData (and IptcData) members of Modify with pointers to avoid using ExifData copy construction or assignment.