Continuing the discussion from Glyphs 2 Beta:
Georg, did you add the code for G+tildecomb and g+tildecomb for automatic feature generation?
Either way, I’m not sure that it needs to be local as Nicolas requested.
The ccmp code is not really needed as the tilde should be positioned by the mark feature.
It would be needed if one wanted to include a precomposed glyph. Is that correct?
No, you can also compose it manually. Add G as component, then add tildecomb, done.