Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0
Another thought I had just after sending the last email... Consider any
font that has a bold face available: Arial, DejaVu, Lucida Grande,
etc.. Their bold faces do not end up being any taller than the regular,
non-bold faces. So, the fact that FT_Outline_Embolden() is making the
glyphs taller seems to go against common practice.