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Test that ligatures are always used, and only used, when they occur before the glyphs for characters they are ligatures of. The word "fjord" is displayed twice; the top one must use the fj ligature and the bottom one must not; the top of the letter f overlaps the dot of the letter i..
Two fonts are defined, almost identical; in one the fj ligature is the first glyph defined, in the second one it is the last glyph.