Add missing entries for IPTC Digital Source Type
Operating System: All
Description of the feature
The enum here is missing newer entries for IPTC Digital Source Type:
https://gitlab.gnome.org/GNOME/gimp/-/blob/master/plug-ins/metadata/metadata-tags.c#L178
See here for possible values:
https://cv.iptc.org/newscodes/digitalsourcetype/
Use cases
This would be a convenient way of creating test data for a system that handles images differently based on Digital Source Type.