When populating the UI, the Grouptagger plugin does not properly setup the 'uncategorized' category for groups that are not currently in the settings. As a result, tags that are in the settings aren't shown in the UI, and when a change is made to the file the tags that weren't shown are lost.
If you setup all your tags using the same installation of Exaile, it would be very difficult to run into this issue. Most users will not run into this issue.
GroupTagger: Extend uncategorized, don't replace it
- Fixes #13