I fixed the excessive emboldening bug by modifying the last step of
computing the emboldening amount: divide by the emRatio, as
FT_Outline_EmboldenXY or at least emboldening inside the autohinter
apparently depends on the units per EM of the font. This also fixed
something else: fonts with units per EM below 1000 were emboldened
excessively, above 1000 were emboldened too lightly.
I think the code can be reviewed now. Werner? :)
https://github.com/madig/freetype2/tree/stem-darkening-autohinter
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