In a .designspace project, when there is kerning, and you add a new font source, the backend gives an error and complains about an unknown source identifier.
The problem is that the kerning is written before the font sources.
This was introduced by #2254.
In a .designspace project, when there is kerning, and you add a new font source, the backend gives an error and complains about an unknown source identifier.
The problem is that the kerning is written before the font sources.
This was introduced by #2254.