show warning if font is missing
It would be nice to show a warning with information about missing fonts if you open a file that contains references to a font that is not installed in the system.
Right now it just switches to another font leading to unexpected behavior and confusion.
When moving xcf files between computers it's easy to forget which fonts were installed on each computer, specially when you work with lot of fonts.
Warning could include font info and layers using it so you can decide if you need it or not. Maybe if you use a lot of layers warning should appear when you make an affected layer visible, not on loading the file.