unicode internal font handling

ok stephen, maybe you can explain this to me. i've done much of the coding towards using unicode internally. but i'm running into problems with all the font-handling stuff in faces.c, which is completely done in terms of charsets. in the unicode world, there will be no leading bytes. i am redoing the places that use an array of fonts indexed by leading byte to use a hash table, but that doesn't solve the underlying problem that fonts are still being determined by doing things like "find all the charsets in a string and then make sure there's a font available for each charset". what should the model be instead? and how to do this in a way that works both with the old X font code and the new xft code? ben