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9ce5d8578b
Insert ligature breaks between hyphens where they are separate in 2.2 but ligated by TeX in 2.1. This fixes output with LyX 2.1 and prevents -- and --- becoming en and em dash in the LyX source after a round-trip to 2.1 and back. Solves lyx2lyx ctest failures with a warning about possible line-break changes.