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Michael Natterer authored
Return flags based on what metadata is actually present in the image. Returning of a suggested value for GIMP_METADATA_SAVE_THUMBNAIL needs support from gimp_image_metadata_load_prepare() and is still missing. Port all plug-ins to use the new API, the suggested values are however overridden by parasites and whatever special code was devised for the individual plug-ins. This needs to be fixed.
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