There is a dissymmetry between e.g. Vorbis tags and ID3: Custom vorbis tags (e.g. "moo") are made available as metadata in the GUI, while ID3 TXXX custom tags (e.g. "TXXX:moo") are not.
I disagree with this. I do not see TXXX frames as equivalent to Vorbis comments.
Ok, sorry, my justification was unfortunately chosen... even if they are not equivalent, I see only positive effects of this change, no negative ones. Why are you against adding them as free form tags?
Hm, I guess it's not so bad. We do not have a way to deal with tags that contain spaces for example, so this could confuse users, but I guess we can deal with issues like that later. So, you can ignore my comment above.
Ok, no problem . I was thinking of the space problem already, but you are right, it exists for vorbis right now also... I will further test my prototype implementation and upload it on github once it is ready!
In review at https://github.com/musicbrainz/picard/pull/26
Merged by luks in https://github.com/musicbrainz/picard/commit/0dfc4be933cc1cea53c63c7411b7e6f8eb2d57ad