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a76de8774b
I had mistakenly pulled a 'char' value out of a string and passed it to x11_font_has_glyph and x11_char_struct, each of which takes its two index bytes as int-typed parameters. But if chars are signed, that turns high-bit-set characters into out-of-range array indices. Oops. The range checks in x11_char_struct prevented that from causing any problem worse than refusal to display any affected glyph. Even so, that's not particularly helpful. Fixed by changing the index byte parameters to unsigned char type.