When loading an xcf file, if a a font has already
been used, its file's hash is compared against the hashes
from the xcf file (to speedup loading), but if the font is from a .ttc file (a font
collection), then all fonts from that file will have the same file
hash, so the wrong font might be selected. a simple solution is to not
use the hash except as a last resort if every other field is identical.
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