(handle_composition_prop): Set it->c to the fist
characte of the composed region. (fill_composite_glyph_string): Set base_face->font_info to s->font_info. Get a face for ascii from base_face->ascii_face. (BUILD_COMPOSITE_GLYPH_STRING): Call fill_composite_glyph_string with a face already decided. (x_produce_glyphs): Be sure to set it->ascent and it->descent to non-negative. (x_produce_glyphs): If the composition method is ..._WITH_GLYPH_STRING, call font_prepare_composition unconditionally.
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