I’m having a hard time getting sensible sidebearings on Vietnamese horn characters using automatic alignment. The horns overlap with adjacent characters.
I tried replacing the horncomb component in the glyphs with a duplicate component called “__horn”, but even when I set the sidebearings on __horn to be zero, I ended up with much wider sidebearings on the composed glyphs than I expected.
The only other thing I can think to do is manually decompose those horns and set sidebearings by hand, but that seems like giving up. Does anyone know a way to make this work using automatic alignment?
Here’s what it looks like with a custom __horn component, which is what the handbook says I should do:
I am also having problems with the horn diacritic; uhorn made of u + horncomb has an automatic RSB of -130, which means it overlaps with the next character. Setting different sidebearings on uhorn makes no difference either way.
I couldn’t find anything in the handbook or tutorials about using a __horn component. How should I use that, and how does it interact with horncomb?