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Jacob Boerema authored
XMP metadata saved by GIMP 2.8.x or earlier can have duplicate tags making the XMP data invalid. There's not much we can do without a whole lot of processing and complicated code and even then no guarantee we would catch everything. Instead let's just try to improve the message to the user so they will be more likely to understand what's going on. (cherry picked from commit 6df6332f)
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