If you create a long width glyph, like something bigger than 8000 units, and try to export or remove overlap you will get the following error “Something went wrong with the Remove Overlap filter in glyph”
Glyphs 2 is using the algorithm by Adobe and that one only has a limited bit size for storing point coordinates. Anything beyond 8191 will fail.
oh! Thank you for the info.
What I did as a workaround once is move the center of the shape over x=0, remove overlap, and move it back again. I had to do it often for the font so I wrote a quick throw-away plug-in.
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Cool idea, thanks!