Hi,
When I generate a font with Supplementary Multilingual Plane characters, I find the usLastCharIndex in the OS/2
gets set to the last Basic Plane unicode in the font. According to the OpenType spec, this value should be set to 0xFFFF for Supplementary Plane fonts.
I am using Glyphs 1161. I find if I go back to Glyphs 1075, this issue does not occur.
Regards,
Alistair